6949495 Etp Manual Std@Aquatech

8/12/2019 6949495 Etp Manual Std@Aquatech

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Aquatech Engineering Services Limited

LOSSAR" OF TERMS

$ic*+ica, O-y* *+a ($O)1The strength of the wastewater is often determined by

measuring the amount of oxygen consumed by microorganism like bacteria in biodegrading theorganic matter. The measurement is known as the Biochemical xygen !emand "B!#.

$icroorganisms such as bacteria are res%onsible for decom%osing organic waste. &hen organicmatter such as dead %lants' leaves' grass cli%%ings' cellulose com%onents' manure' sewage' organic

waste like dyes' fats and oils' or even food waste is %resent in a water su%%ly' the bacteria will

begin the %rocess of breaking down this waste. &hen this ha%%ens' bacteria in aerobic %rocess'robbing other aquatic organisms of the oxygen they need to live' consume much of the available

dissolved oxygen.

(f there is a large quantity of organic waste in the water su%%ly' there will also be a lot of bacteria%resent working to decom%ose this waste. (n this case' the demand for oxygen will be high "due to

all the bacteria# so the B! level will be high. As the waste is consumed or dis%ersed through thewater' B! levels will begin to decline.

)itrogen and %hos%hates in a body of water can also contribute to high B! levels. )itrates and

%hos%hates are %lant nutrients and can cause %lant life and algae to grow quickly. &hen %lants

grow quickly' they also die quickly. This contributes to the organic waste in the water' which isthen decom%osed by bacteria. This results in a high B! level. The tem%erature of the water can

also contribute to high B! levels. *or exam%le' warmer water usually will have a higher B!

level than colder water. As water tem%erature increases' the rate of %hotosynthesis by algae andother %lant life in the water also increases. &hen this ha%%ens' %lants grow faster and also die

faster. &hen the %lants die' they fall to the bottom where they are decom%osed by bacteria. The

bacteria require oxygen for this %rocess so the B! is high at this location. Therefore' increasedwater tem%eratures will s%eed u% bacterial decom%osition and result in higher B! levels.

&hen B! levels are high' dissolved oxygen "!# levels decrease because the bacteria are

consuming the oxygen that is available in the water. Since less dissolved oxygen is available in thewater' fish and other aquatic organisms may not survive. Textile mill wastewater %ossesses a very

high B! like +,, - ,, mg/l. (t is necessary to reduce this B! value u% to a level less than 0,

mg/l before discharging them into the environment like canals or rivers. (f a water body of highB! is discharged into the sea or very large river then off course the concentration of B!

decreases due to dilution and have little or no harmful effect on the aquatic life or environment.

Therefore if it is %ossible to discharge a highly toxic effluent in sea or large river no treatment is

necessary.

Though it was not mentioned' the dissolved oxygen "!# is a highly significant %arameter to

define the B! or 1! of a wastewater. The amount of oxygen %resent in a certain amount ofwater in dissolved state is known as !. (t is normally ex%ressed as mg/l. &ater may contain !

ranging from , to 23 mg/l but in most cases of normal waters' ! lies between 456 mg/l. Aquatic

lives require certain level of ! to survive in the water. (n case of wastewater the microorganismsrequire oxygen to consume the organic wastes. As a result the ! of water decreases

tremendously and becomes a threat to the life of aquatic s%ecies. Textile effluents %ossess very low

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!' which is unsuitable for discharging to the environment. !uring treatment of wastewater air is

blown through the effluent when oxygen is dissolved in the effluent as a result ! level raises and

as the ! increases the B!/1! decreases.

C*+ica, O-y* *+a (CO)1This is a means of measuring the ability of wastewater to

sustain aquatic life' essential for the %reservation of the environment. (t also enables %ro%er

assessment of treatment %lant %erformance. Aquatic organisms and animals require dissolvedoxygen to flourish. The 1hemical xygen !emand "1!# test gives an indication of the im%act of

discharge waters on aquatic life by measuring the oxygen de%leting nature of the discharge water.

1! is based on the fact that nearly all5organic com%ounds can be fully oxidi8ed to carbon

dioxide with a strong oxidi8ing agent under acidic condition. 1! is another common measure of

water5borne organic substances 9 the %rocess of measuring 1! causes the conversion of allorganic matter into carbon dioxide. *or this reason' one limitation of 1! is that it cannot

differentiate between biologically active and those which biologically inactive. ne ma:oradvantage of 1! over B! is that 1! can be measured in :ust three hours where as B!

measurement takes at least five days. The value of 1! is always higher than B!' this isbecause B! accounts for only biodegradable organic com%ounds while 1! accounts for all

organic com%ounds e.g. biodegradable as well as no biodegradable but chemically oxidisable.

Tta, 22p** S,i2 (TSS)1TSS is mainly organic in nature' are visible and can be removed

from the wastewater by %hysical/ mechanical means e.g. screening and sedimentation. TSS is

measured by filtering a certain quantity of effluent and then drying the filtrate at certaintem%erature e.g. 2,;,1 followed by weighing. TSS is ex%ressed as %arts %er million or in

milligram/litre. The %ore si8e of the filter %a%er is very im%ortant in estimating the TSS' the

nominal %ore si8e 2.;3 micro metre.

Tta, i22,4* S,i2 (TS)1 T!S are the solids that are actually in solution' similar for

exam%le to mix sugar into hot coffee. !issolved solids generally %ass through the system

unaffected. T!S is the sum total of all of the dissolved things in a given body of water. (t iseverything in the water that


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!issolved solids also come from inorganic materials such as rocks and air that may contain

calcium bicarbonate' nitrogen' iron %hos%horous' sulfur' and other minerals. $any of these

materials form salts' which are com%ounds that contain both a metal and a nonmetal. Salts usually

dissolve in water forming ions. (ons are %articles that have a %ositive or negative charge.

&ater may also %ick u% metals such as lead or co%%er as they travel through %i%es used to

distribute water to consumers.

The effectiveness of water %urification systems in removing total dissolved solids will be reduced

over time' so it is highly recommended to monitor the quality of a filter or membrane and re%lacethem when required.

T!S may be the most misunderstood factor in the whole field of chemical %rocessing and %ublic

health. (n most cases it is misunderstood because no one knows exactly what effect it is going tohave on any %articular body of water. T!S is directly related to the %urity of water and the quality

of water %urification systems and affects everything that consumes' lives in' or uses water' whetherorganic or inorganic' whether for better or for worse.

!ifferent standards advise a maximum contamination level "$1L# of ;,,mg/liter ";,, %arts %er

million "%%m## for T!S' however for domestic water su%%liers maintain the T!S within 2;, %%m.

ff course some water su%%lies exceed this level. &hen T!S levels exceed 2,,,mg/L it isgenerally considered unfit for human consum%tion. $ost often' high levels of T!S are caused by

the %resence of %otassium' chlorides and sodium. These ions have little or no short5term effects'

but toxic ions "lead arsenic' cadmium' nitrate and others# may also be dissolved in the water.

At low levels' T!S does not %resent a %roblem. (n fact' a certain amount of T!S is necessary for

water balance. =ardness and Total Alkalinity are both %art of T!S. *or textile %rocessing theacce%table value of T!S is around ;52;, mg/l. The standards for bath and swimming %ool arebetween 2',,, and 7',,, %%m' with a maximum of 0',,, %%m. *or irrigation the acce%table values

of T!S are around 2;,, %%m. >se of fertili8ers increases T!S of the environment.

&hen the water eva%orates' it leaves behind all of the solids that had been dissolved in it. This%rinci%le is used widely to measure the T!S of a %articular body of water. &hen everything else

seems to be all right' and the water still acts unlawfully' check the T!S.

=igh T!S can result in corrosion of metal equi%ment and accessories' even though the water is

balanced.

=igh T!S can cause eye and skin irritation' even though the %= is right and there are no

chloramines in the water. =igh T!S can %ermit an algae bloom' even with 750 %%m chlorineresidual.

(f we drink water of high T!S some of this will stay in the body' causing stiffness in the :oints'hardening of the arteries' kidney stones' gall stones and blockages of arteries' microsco%ic

ca%illaries and other %assages in which liquids flow through our entire body.

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Micrrai2+2 8 $icrosco%ic living ob:ects' which require energy' carbon and small amounts of

inorganic elements to grow and multi%ly. They get these requirements from the wastewater and the

sun' and in doing so hel% to remove the %ollutants.

pH 9 A term used to ex%ress the intensity of the acid or alkalinity source. %= re%resents theeffective concentration "activity# of hydrogen ions "=?# in water. This concentration could be

ex%ressed in the same kind of units as other dissolved s%ecies' but =?concentrations are much

smaller than other s%ecies in most waters. The activity of hydrogen ions can be ex%ressed mostconveniently in logarithmic units. %= is defined as the negative logarithm of the activity of = ?

ions@

%= 5log =?C

where =?C is the concentration of =?ions in moles %er liter "a mole is a unit of measurement'

equal to .,77 x 2,70

atoms#. Because =?

ions associate with water molecules to form hydronium"=0

?# ions' %= is often ex%ressed in terms of the concentration of hydronium ions. (n %ure water

at 77 1 "47 *#' =0?and hydroxyl "=5# ions exist in equal quantitiesD the concentration of

each is 2., x 2,54moles %er liter "mol/L#. Therefore' %= of %ure water 5log "2., x 2, 54# 5"54.,,# 4.,,. Because %= is defined as -log =?C' %= decreases as =?C increases "which will ha%%en if

acid is added to the water#. Since %= is a log scale based on 2,' the %= changes by 2 for every

%ower of 2, changes in =?C. A solution of %= 0 has an =? concentration 2, times that of a solutionof %= +. The %= scale ranges from , to 2+. =owever' %= values less than , and greater than 2+

have been observed in very rare concentrated solutions.

The >.S. Environmental rotection Agency ">.S. EA# sets a secondary standard for %= levels in

drinking water@ the water should be between %= .; and 3.;.

Fery high "greater than 6.;# or very low "less than +.;# %= values are unsuitable for most aquaticorganisms. Goung fish and immature stages of aquatic insects are extremely sensitive to %= levels

below ; and may die at these low %= values. =igh %= levels "652+# can harm fish by denaturing

cellular membranes.

1hanges in %= can also affect aquatic life indirectly by altering other as%ects of water chemistry.Low %= levels accelerate the release of metals from rocks or sediments in the stream. These

metals can affect a fishHs metabolism and the fishHs ability to take water in through the gills' and

can kill fish fry.

The term I%=I was originally derived from the *rench term I%ouvoir hydrogJne'I in English' this

means Ihydrogen %ower.I The term %= is always written with a lower case % and an u%%er case =.

S,*8The settable solids se%arated from the liquid during sedimentation "clarification#. Thesludge is very toxic in nature and needs to be dealt with very carefully. >nder no circumstances it

should be mix with the environment again.

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:. INTROUCTION

Aquatech Engineering Services' !haka' have %re%ared this o%erating and maintenance manual for

the Effluent treatment %lant installed at KKKKKKKK.' 1handora' aliakoir' Ma8i%ur. (tre%resents the methodology of %rocess o%eration of the effluent treatment %lant and maintenance

of the %lant equi%ments. The manual will be hel%ful to run the effluent %lant effectively andefficiently.

Every effluent treatment %lant is unique with res%ect to its %rocess flow sheet. This is because the

treatment scheme is ado%ted on the basis of design and in%ut characteristics of the effluent as wellas the sti%ulated %ollution level of the treatment. This in turn de%ends on the ty%e of %rocess' ty%e

of generated waste' whether the treated waste will be discharged or recycled' the nature of water

receiving body where the treated waste will be discharged "if any# and the %ollution laws of theconcerned %ollution authority. (t must therefore be a%%reciated that effluent treatment %lants are

tailor5 made' and hence the mode of o%eration would be s%ecific for the treatment envisaged.

The o%erating manual serves as an im%ortant guideline for the o%erating %ersonnel res%onsible for

the start5 u% and maintenance of the equi%ment and facilities %rovided in the %lant. The instruction

%resents in this manual are based on the ex%erience in o%eration of such %lants. =owever' due tovariable nature of the effluents encountered in each %lant' certain modification of %rocess

o%eration may be necessary de%ending on the degree of variation in the raw effluent quality and

quantity.

This manual includes a brief descri%tion of the basis of design of the ET' the ado%ted treatment

%hiloso%hy and the %rinci%les of treatment involved. The %lant was designed to treat effluents

generated from the various sections of the knit fabric dyeing and finishing %lant. The schemeenvisages treatment of two se%arate wastewater streams namely the less contaminated water and

more contaminated water. The less contaminated effluents are allowed to by%ass many stages

before uniting together again with mainstream and finally discharged to the environment. This hasbeen done deliberately to reduce the treatment time and o%erating cost.


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;. $a2ic2 6 *66,*t tr*at+*t

Environmental %roblems of the textile industry are mainly caused by discharges of wastewater.

Textile %rocessing em%loys a variety of chemicals' de%ending on the nature of the raw materialand end %roduct. Some of these chemicals are different en8ymes' detergents' dyes' acids' sodas

and salts. (ndustrial %rocesses generate wastewater containing heavy metal contaminants. Sincemost of the heavy metals are non5degradable into non5toxic end %roducts' their concentrations

must be reduced to acce%table levels before discharging them into the environment. ther wise

these could %ose threats to %ublic health and/or affect the aesthetic quality of %ortable water.

According to &orld =ealth rgani8ation "&=# the metals of most immediate concern arechromium' 8inc' iron' mercury and lead. Farious ty%es of treatment %rocesses are ado%ted to dye

or %rint or finish the textile materials. !ifferent ty%es of textile %rocess could generate different

ty%es of effluent. Table 2.2 shows the 1haracteristics of wastewater %roduced by a ty%ical knitdyeing industry.

Taat*r

5a2t* >at*r

4,+*

Natr* 6

>a2t*

5at*r

,2 Scouring )a=''&axes' grease

)a71o0' )a77' Si7And fragments of cloth.

Small 2, L/ kg

of cloth

Strongly alkaline'

dark color' high

B! "0,N oftotal#

,7 Bleaching )a1l' 1l7' )a=' =77'Acids etc.

$ostlywashing

Alkalineconstitutes' a%%rox

; N of B!

,0 !yeing Farious dyes' salts'

alkalies' Acids'

)a7S')a7S77and soa%

etc.

Large Strongly colored'

fairly B! " N

of the total#

,+ *inishing !ifferent finishing agent' Fery small Low B!

T* a*4*r t*

4*ra,, i2car*2 6 a it y* 2* ar* a2 6,,>2@

1olor "organic substance#' )a7 S+ "inorganic#' )a=' )a=1l "Sodium hy%ochlorite#' )a7 S0'

Surfactant "LAS' B(AS' 1(AS#' ")=#0 S+' =77'1=01= "rganic#' %araffin "organic#'

1ellulose' il "rganic#' Soa% "rganic#D all these things are 1! and B!.

The fate of the above mentioned %ollutant chemicals vary' ranging from 2,,N retention on thefabric to 2,,N discharge with the effluent. Menerally' a wet %rocessing industry generates

wastewater %ossessing various level of toxicity. Textile finishing industry uses large amounts of

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water' mainly because of washing o%erations. (f these wastewaters are discharged into the

environment they will cause serious and harmful im%act not only on under ground and surface

water bodies and land in the surrounding area but also will have an adverse effect on the aquatic

ecological system. Effluents from textile mills also contain various ty%es of metals' which has acumulative effect' and higher %ossibilities for entering into the food chain and may cause various

ty%es serious diseases. !ue to usage of dyes and chemicals' effluents are dark in colour' which

increases the turbidity of water body. This in turn ham%ers the %hotosynthesis %rocess' causing thedeath of many aquatic %lants. (f aquatic dyes then more oxygen will be required to consume them

by bacteria thus causing a reduction of dissolve oxygen in the water. Farious ty%es of dyes are

used in dyeing of various ty%es of textiles fibres. *ixation ca%ability of different dyes is different.The higher the fixation ca%acity the lower is the %ollution %roblem. Table 2.7 shows the quantity

of unfixed dyes and %ollutants of various colouration %rocesses while table 2.0 shows the degree

of fixation of various dyes.

Tait 4ari2 c,rati prc*22*2.

*ibre !yes 1lass Ty%e of %ollution

1otton !irect !yes 2. Salts

7. >nfixed dye "; - 0, N#

0. 1o%%er salts' 1ationic5fixing agents.

1otton Oeactive !yes 2. Salts

7. Alkali0. >nfixed dye "2, -+, N#

1otton Fats !yes 2. Alkali

7. xidi8ing agents0. Oeducing agents

1otton Sul%hurs !yes 2. Alkali7. xidi8ing agent

0. Oeducing agent

+. >nfixed dye "7, -+, N#

olyester !is%erse !yes 2. Oeducing agent

7. rganic acid0. >nfixed dye "; - 7, N

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1ationic retarders and softeners

BiocidesSequestering agents' =eavy metal salts

biological treatment'

negligible B!.

;

The level of the %olluting %arameters is very high in textile mill wastewater as com%ared to the

their acce%table values recommended by the !e%artment of Environment' Movernment of eo%les

Oe%ublic of Bangladesh "MB#. ff course the acce%table level of the %ollutants varies somewhatform country5to5country and even within the country. The main reason for this is the wastewater5

receiving environment. (f the effluent is discharged into a very big river or sea in that case vary

little or no treatment is necessary as the wastewater will have very little or no effect on such alarge water body. =owever if the same effluent is discharged into a small river or canal in that case

off course it will be necessary to treat the wastewater since the effluent will have significant effect

on the receiving water. Table 2.; shows the values of the im%ortant %ollutants found in the

wastewater of the KKKKKK A%%arels LimitedTable 2. shows the acce%table values of theabove %ollutants of wastewater suggested by the !e%artment of Environment' MB. (t will be seen

in table 2.;' that reference has been made about a range rather than a %articular value of the

%arameters. This is because the characteristics of textile wastewater are not always same which isdue to the variation of raw materials' dyes and chemicals etc. *or exam%le a factory sometime

%rocess 2,,N cotton and sometime %rocess ;,/;, cotton P %olyester blend or even 2,, N

%olyester. The three different cases will require different dyes and chemicals. *or white goods nodyes are used at all' in that case the effluent characteristics will be different from that of dyed

effluent. *or si8ed fabrics the effluent characteristics will be different from that of knit fabrics. The

values shown in table 2.; are %resented from our long time ex%erience about the effluentcharacteristics of similar %lants. The ET is designed in a such a way so that if the your factory

changes the %rocessing nature to some other %roducts' even then the et% will be able to handle thetreatment efficiency without any %roblem.

Hyra,ic iara+ 6 t* p,at

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3. $a2i2 6 t* P,at *2i

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3.: Src*

The raw effluent shall be discharge to the %ro%osed effluent treatment %lant from the dyeing and

finishing section of the KKKKK..A%%arels Limited.

3.; %atity

The quantity of effluent to be treated shall be of the order of 6, m0 / day.

3.3 Capacity 6 t* E66,*t Tr*at+*t P,at (ETP).

The effluent treatment %lant has been designed on the basis of the following

!yeing ca%acity is 2,',,, kg /day

1ontaminated effluent is ;,N Less 1ontaminated effluent is ;,N

%erated continuously for 23 hours a day.

*low rate of treatment envisaged is 0, m0/ hr.

3. I,*t E66,*t Caract*ri2tic2

S,.N Para+*t*r2 >nit 'a,*22 = 3 -2+

7 B! mg/L +,, 5 ,,

0 1! mg/L 3,, 5 2'7,,

+ TSS mg/L 7,, 5 ;,,; T!S mg/L 0',,, 5 ',,,

(L P MOEASE mg/L 0, - ,

4 1L>O 1o5%t unit !ark $ixed

3 TE$EOAT>OE ,1 ,,1

3.B Ot,*t E66,*t Caract*ri2tic28$a,a*2 Staar

Sl.

)o.

&ater quality

%arameters

>nit Standard value for discharging into Q

(nland river n land for irrigation

2 = 5555 56 56

7 B! mg/L R;,., R 2,,0 1! mg/L R7,,., R +,,

+ TSS mg/L R2;,., R7,,

; T!S mg/L R72,, R 7'2,,

il P Mrease mg/L R 2, R 2,

4 1olor 1o5%t unit R2;, R2;,

3 Tem%erature ,1 R0,,1 R 0, ,1

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. Tr*at+*t Pi,2py

As was mentioned the method of treatment of wastewater varies a lot. (t mainly de%ends on the

characteristics of effluent' volume of effluent' level of toxicity to be removed and the ty%e ofenvironment to receive the effluent. (t was also suggested by some standards that the effluent

might require very little or no treatment at all if the effluent is discharged into a very large river orsea. The treatment %rocess that has been ado%ted for the Effluent Treatment lant installed at KK

KKKKKKK.. Limitedis known as %hysico chemical and followed by biological. The %hysico

chemical %rocess consists of screening' coagulation and flocculation and sedimentation. The

%hysico chemical %rocess removes a substantial %art of all the %arameters shown in table 0.+The biological treatment is res%onsible for removal of the rest of the removable B! and some

1! as well. The biological treatment is carried out by moving bed biofilm reactor "$BBO# in

the biological tank. $BBO is a new conce%t of wastewater treatment and was develo%ed by a)orwegian com%any known as A-a,*2. $BBO is a highly efficient method of reducing

the B! of a body of wastewater.

*igure 2@ $oving bed %lastic media *igure 7@ Bacteria in the %lastic media

*igure 0@ Bacteria in the %lastic media *igure +@ Bacteria in the %lastic grid media

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The $BBO biofilm technology is based on s%ecially designed %lastic biofilm carriers or

biocarriers that are sus%ended and in continuous movement within the biological tank or reactor of

s%ecified volume. The design of associated aerators' grids' sieves' s%ray no88les and other integral

%arts to the reactor is also of great im%ortance in making u% the system as a whole. The system issuitable for treating both industrial as well as munici%al wastewater. The textile effluent is led to

the $BBO treatment reactor where biofilm' growing within the internal structures of the

biocarriers' degrade the %ollutants. These %ollutants that need to be removed in order to treat thewastewater are food or substrate for growth of the biofilm. The biocarrier design is critical due to

requirements for good mass transfer of substrate and oxygen to the microorganisms and there is a

continuous OP! in the area of the $BBO biofilm technology. Excess biofilm sloughs off thebiocarrier in a natural way. An aeration grid located at the bottom of the reactor su%%lies oxygen to

the biofilm along with the mixing energy required to kee% the biocarriers sus%ended and

com%letely mix within the reactor.

Treated water flows from reactor through a grid or a sieve' which retains the $BBO biocarriersin the reactor. The various stages of the %lant treatment %rocedure is elaborated as followsD

After biological treatment the effluent is %assed through sand filter and finally though the activated

carbon filter. The activated carbon filter is highly successful in removing B!' 1!' TSS' T!S

P color of the effluent.

.:. PRE8TREATMENT

.:.: Scr**i 8 to remove coarse materials

.:.; EDa,iati & Si++i 8 to remove grease & oil and homogenize and to removesome BOD & COD.

.;.PRIMAR" TREATMENT

.;.: Ca,ati -to coagulate the suspended solid to coagulate

.;.; F,cc,ati - to flocculate by coagulants

.;.3 N*tra,iati - to adjust the pH beteen !." to #."

.;. S*i+*tati$to precipitate small suspended solids

All the above %rocesses contribute to removal of substantial amount of all the %olluting%arameters.

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. 3. SECONAR" TREATMENT

$i,ica, tr*at+*t (M$$R)8 to remove BOD and COD & to decompose organic matter.

. . TERTIAR" AN OTHER TREATMENTS

..: ra,ar M*ia Fi,trati8t r*+4*2 TSS a ay t*r p,,tat2 i t* 6r+

6 partic,*. Ti2 6i,t*r i2 a,2 2*6, t prt*ct t* Acti4at* Car*,, a2 iraic

2c a2 2,6i*2 a *a4y +*ta,2 r*+aii i a t*r>i2* >*,,8tr*at*>a2t*>at*r.

. B. SLUE MANAEMENT & ISPOSAL

+.;.2 S,* i2p2a, 9 to separate the sludge from the thic% slurry and then dispose ofthe sludge as dried ca%e

B. PROCESS FLO5 CHART

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G. Op*ratia, Prc*22*2

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G.:.Pr*8Tr*at+*t

The effluent generated in a textile wet %rocessing %lant can be broadly classified into two classese.g i# Less contaminated and ii# =ighly contaminated. The Less contaminated waters are mainly

generated due to machine washing' floor cleaning' waters coming from the last washing cycles etc.These less contaminated waters %ose very little threat to the environmentD therefore they can be

discharged directly to the environment or may require little treatment. (f however these waters are

mixed with the main effluent' then the volume of total effluent will be very high and as a resultoverall install ca%acity running cost of the ET will be very high. Therefore the less contaminated

waters are stored in a se%arate tank and from time to time the effluent is %um%ed to the sand filter

followed by carbon filter and finally to the discharge outlet. The more contaminated waters are

guided through the bar screen to the equali8ation tank for various treatments.

G.:.: Scr**i (T r*+4* car2* a 6,at +at*ria,2.)

The raw waste water "Oaw Effluent# from the %rocess of the %lant would first be screened through

a manual bar screen strainer channel' where all %articles with dia. ; $$ as well as small %ieces

of the fiber and floating sus%ended matters like %olythene %a%er' %olythene bags' rags and othersmaterials are removed by bar screen net. The bar screen consists of %arallel rods or bars and is also

called a bar rack. These devices are used to %rotect downstream equi%ment such as %um%s' lines'

valves etc. from damage and clogging by rags and other large ob:ects. The bar screen is cleanedmanually by means of rakes. The screening is dis%osed off suitably after they are de5watered. The

screened clean effluent flows by gravity to an equali8ation tank.

G.:.; EDa,iati a Si++i (T r*+4* r*a2* & i, a +*i*#

The raw wastewater from the screen channel is collected in the equali8ation tank' where it is

equali8ed with res%ect to its characteristics' homogeneity' flow and an uniform %ollution load aswell as to make bacteria acclimati8ed. =igh5s%eed aerating devices are fixed at the bottom of the

equali8ation tank' which blows air through the waste at a rate about ,.2 1>* of air %er gallon of

effluent. The rising air tends to coagulate the grease and oils and cause them to rise to the surfacewhere they can be removed by a scra%er mechanism. Besides' the airflow accom%lishes a %ro%er

equali8ation of both varying loading and fluctuating = values. The equali8ation tank is designed

for hydraulic retention time of around hours. 1ertain amount of 1! will also be removed bythe dissolved air flotation %rocess. The following benefits are derived from the flow equali8ation

%rocessD

2. Biological treatment is enhanced' as the shock loadings are eliminated or minimi8ed' inhibitingsubstances diluted' and %= stabili8ed.

7. 1hemical treatment is im%roved if chemical dosing is controlled to %rovide consistent

%erformance

0. The effluent quality and thickening %erformance of secondary sedimentation units are im%roved

through constant solids loading.

24


18/49


+. Effluent surface area requirements are reduced' filter %erformance is better' and more uniform

filter5backwash cycles are %ossible.

G.;. Pri+ary8Tr*at+*t

G.;.: Ca,ati a F,cc,ati (T r*+4* c,r a *66,*t 22p**)

The homogeni8ed effluent will then be %um%ed to a flash5mixing tank followed by a flocculation

tank. (n the flash5mixing tank coagulants like lime "1alcium =ydroxide# and flocculants likeferrous sulfate "*eS+# are dosed. This is done for coagulation and removal of the total dye

%articles. The basic idea of adding coagulant is to bring together all the sus%ended and dye

%articles so that they can be %reci%itated out in the flash mixing tank and flocculation tank by

coagulation and flocculation mechanism. The chemical reaction that occurs in the coagulation andflocculation %rocess is shown belowD

1a ? =7 1a "=#7

The above reaction take %lace in lime dosing tank when lime reacts with water and we get calcium

hydroxide solution. This solution reacts with the ferrous sul%hate solution' which as follows

1a "=#7 ? *eS+ 1aS+ ? *e "=#0

? *eS+ ">nreacted# ? *e "=#7

Adequate quantity of %olyelectrolyte %olymer solution is dosed in the flocculation tank to enhance

the %rocess of colour removal by the flocculation %rocess. A substantial amount B! and 1!

etc. are removed in the coagulation and flocculation %rocess.

G.;.; Pr*cipitati a S*i+*tati i T


19/49


G.3.: $i,ica, Tr*at+*t i t* F,ii* A*r


20/49


*eS+ ? 7 *e7"S+#0

*e "=#7? 7 *e "=#0

&hen the %lant is ke%t shut down for short %eriod of time' at that time' off course' it will be

necessary to continue the aeration of Biological reactor 2 P 7. The biological degradation %rocess

in enhanced by the adding some !ia5mmonium hos%hate "!A# and >OEA' which acts as foodfor the microorganism. Therefore it will be necessary to su%%ly food for the bacteria. Thus a

combined solution of >rea and !A are dosed in the biological tank to feed the bacteria.

G.3.; T


21/49


G.3.J S,* Tr*at+*t a a,i

The sludge generated in the flash mixing tank' flocculation tank' tube settler52' tube settler57 andbiological reactor is taken to a sludge sum%. =ere also aeration is carried out. The waste is then

%um%ed to a Sludge Thickener tank where the sludge is concentrated at the bottom of the tank.

The thickened sludge from the thickener is %um%ed to centrifuge %um% for de5watering. At firstthe centrifuge is started and then the thickener feed %um% is started. As the slurry of sludge flows

%olyelectrolyte solution is dosed in the centrifuge as a result the sludge will be se%arated from the

water. The centrifuge is run for 7, to 0, minutes and then switched off.

The de5watered sludge is transformed into cake form. The dried cake may be dis%osed of to

deliver in the brickfield for burning. The overflow from the sludge thickener will be flow back toequali8ation tank for further treatment.

(n some cases due to the nature of the wastewater characteristics it is not %ossible to dewater the

sludge into a cake form' in that case the sludge is collected in the form of slurry in a bucket :ustbelow the centrifuge %um%. After collection of the sludge' it is strongly advised to dis%ose the

sludge in such a way so that it will not come in contact with the environment. A best way to handle

this sludge is to throw them in a dee% hole' when the hole is nearly filled then it will be necessaryto bury the sludge by means of soil.

(n every two days the sludge cake is taken out by o%ening the cover of the centrifuge. After takingout of the cake the centrifuge is washed and clean by water. The water that has been se%arated

from the sludge will be flown back to equali8ation tank for treatment.

J. Op*ratia, Prc*r*

J.: Pr*parati 6 t* c*+ica, 2i

72


22/49


Before starting the o%eration it will be necessary %re%are all the necessary chemical solutions. The

%rocedures of %re%aring the solutions are described below.

J.:.: Pr*parati 6 t* Li+* 2,ti

The daily requirement of the lime solution is calculated and shown in section 3.2. !uring%re%aring the dosing solution of lime a ;N solution is %re%ared. (n this regard the dosing tank'

which is fitted with a motor and stirrer' is at first filled with 2,,, litres of water. After that ;, kgs

of lime is added and the motor is switched on to stir the solution. The stirring should be continued

on a 7+5hour basis i.e. as long as the %lant runs. After that the solution is ready for dosing in theflash5mixing tank. (t is necessary to ad:ust the stroke of the dosing %um% to get the desired flow.

J.:.; Pr*parati 6 t* F*rr2 S,pat* (F*SO) 2,ti

The daily requirement of the ferrous sul%hate is calculated and shown in section 3.7. !uring%re%aring the dosing solution of ferrous sul%hate a 2,N solution is %re%ared. (n this regard thedosing tank' which is fitted with a motor and stirrer' is at first filled with 2,,, litres of water. After

that 2,, kgs of ferrous sul%hate is added and the motor is switched on to stir the solution. The

stirring is continued for nearly 2 hour. After that the solution is ready for dosing in the flash5mixing tank. (t is necessary to ad:ust the stroke of the dosing %um% to get the desired flow.

J.:.3 Pr*parati 6 t* P,y E,*ctr,yt* (PE) 2,ti

The daily requirement of the E solution is calculated and shown in section 3.0. !uring %re%aring

the dosing solution of lime' a ,.,;N solution is %re%ared. (n this regard the dosing tank' which is

fitted with a motor and stirrer' is at first filled with 2,,, litres of water. After that ;,, gms of E isadded and the motor is switched on to stir the solution. The stirring should be continued on a 7+5

hour basis i.e. as long as the %lant runs. After that the solution is ready for dosing in the flash

mixing tank as well as centrifuge tank. (t is necessary to ad:ust the stroke of the dosing %um% toget the desired flow.

J.:. Pr*parati 6 t* Aci 2,ti

The daily requirement of the Acid solution is calculated and shown in section 3.+. !uring

%re%aring the dosing solution of acid' a 7.;N solution is %re%ared. (n this regard the dosing tank'

which is fitted with a motor and stirrer' is at first filled with 2,,, litres of water. After that 4, litres

of 00N =1l is added. After that the solution is ready for dosing in the flash5mixing tank. (t isnecessary to ad:ust the stroke of the dosing %um% to get the desired flow.

J.:.B Pr*parati 6 t* ia++i+ P2pat* (AP) a Ur*a 2,ti

The requirement of the !A and >rea is calculated and shown in section 3.;. !uring %re%aring thedosing solution of !A and >rea a ;N mixed solution is %re%ared in the same dosing tank. (n this

regard the dosing tank' which is fitted with a motor and a stirrer' is at first filled with 2,,, litres of

water. After that ;, kgs of !A and >rea "0; kgs >rea and 2; kgs !A# are added and the motor

77


23/49


is switched on to stir the solution. The stirring should be continued for half of an hour. After that

the solution is ready for dosing in the biological tank. (t is necessary to ad:ust the stroke of the

dosing %um% to get the desired flow.

J.; M*t 6 2**i


24/49


0. Oegularly follow the lubrication and maintenance schedule for all mechanical moving

items.

+. Take sam%les from the locations s%ecified. Analy8e them and maintain logbook regularly

to ensure better control over o%eration of the %lant.

J.3.;

2. !o not let effluent -having %ollutants more than s%ecified range in the %lant .

7. !o not enter in to the closed tank without o%ening the manhole/without draining the

contents of the tank.0. !o not handle chemicals' dosing system without taking %recautions.

4. !o not allow acidic %= R or alkaline %= 3.; or hot "tem% +,,1#

;. !o not drain the *AB reactor under normal o%eration.

J. Tr


25/49


J..; Fa+i Pr


26/49


Ad:ust %= in *AB reactor in between .; and3.;

(nsufficient aeration (nsufficient aeration may lead to decrease inbacterial %o%ulation. The aeration should becontinuously carried. Even if the effluent is not

available for a short s%an in a day blowers

should not be st%%ed.

Shock loading The effluent having %ollutant level very high

should be segregated and stored se%arately.

The effluent having toxic %ollutant should be

%revented from entering the ET.

J..B Hi 22p** 2,i2 ,*4*, i t* t


27/49


(nadequate ! 1heck organic loading by measuring 1!.

(ncreased oxygen utili8ation can result fromincreased organic loading. Oefer to corrective

actions for Ulow oxygen level in *AB OeactorV

K.E2ti+ati 6 4ari2 c*+ica,2

The requirements of various chemicals must be determined by means of :ar test. (t is stronglyrecommended to conduct the :ar test whenever any ma:or changes occurs either in selection of

74


28/49


%rocess' dyes' or raw material characteristics. !ifferent %rocess condition due to change of raw

material or change of brand of dyes will lead to different ty%es of effluent characteristics.

K.: E2ti+ati 6 Datity 6 ,i+* (Ca,ci+ Hyr-i*)@5

*rom our ex%erience of running %lants and :ar tests' the quantity of required lime can be estimated

as followsD

(f the flow of effluent is 0, $0/=r.

!ose o%timi8ed by :ar test 300 mg / l.

Therefore' 0, $0/hr. W 300 mg /l W 7+ hrs.

CaOrequired 555555555555555555555555555555555555555555555 ,, g / day. 2,,,

7; kg/hr

K.; E2ti+ati 6 Datity 6 F*rr2 S,pat* F*SO.

Based on ex%erience or by :ar tests findings the dosages can be stabili8ed. e.g.(f flow of effluent is +, 1um / =r.

!ose o%timi8ed by :ar test 300 mg / l.

Therefore 0, $0/hr. W 300 mg /l W 7+ hrs.

F*SO required 5555555555555555555555555555555555555555555555555 ,, g / day.

2,,, 7; kg /hr

K.3 E2ti+ati 6 Datity 6 P,y*,*ctr,yt*.

Based on ex%erience or by :ar tests findings the dosages can be stabili8ed. e.g.

(f flow of effluent is 0, 1um / =r.

!ose o%timi8ed by :ar test +.2 mg / l.

Therefore' 0, $0/hr W +.2mg / l W7+ hrs

olyelectrolyte required 55555555555555555555555555555555555555555555 0 kg / day 2,,,

,.27; kg / hr

(This amount will be required for dosing in the flash mixing as well as centrifuge feed %um%#

73


29/49


K. E2ti+ati 6 Datity 6 Hyrc,ric Aci ( HC,)

These can be o%timi8ed by using Xar test %rocedure given bellow

Based on ex%erience or by :ar tests findings the dosages can be stabili8ed. e.g.(f flow of effluent is 0, $0/=r.

!ose o%timi8ed by :ar test 04; mg / l

Therefore

0, $0/ hr W 04; mg/l W7+ hrs

=1l -00N required 5555555555555555555555555555555555555555555555 74, gs / day

2,,, 22.7; kgs / hr

K.B E2ti+ati 6 Datity 6 AP a Ur*a

Assume B! content of the feed to the system 7,, mg/ l.

*low of effluent to the system is 0, $0/ hr.

0, W 7,, W 7+

Total B! load 555555555555555555555555 2++ gs /day.

2,,,

Basis for activated sludge %rocess is B! @ ) @ 2,, @ ; @ 2.

2++ W ;*or 267 kgs / day B! )itrogen required. 55555555555555 6. kg /day.

2,,

2++ W 2hos%horus required 555555555555555 2.++ g / day.

2,,

)ow' !A contains 24.6 N %hos%horus' for 2.67 g %hos%horus' !A required.

2.++ W 2,,

555555555555555555 3.,+ gs / day

24.6 ,.0+ kg / hr

!A contain 23 N )itrogen' therefore )itrogen %rovided by 3.,+ kg !A is

3.,+ W 23

5555555555555555555 2.+; kg. 2,,

76


30/49


)itrogen shortfall 3.,+- 2.+; ., g / day.

)ow' urea contains + N )itrogen' so for 4.3 g )itrogen' >rea required is

., W 2,,

55555555555555555555555 2+.0; g / day. +

,., kg / hr.

Therefore' >rea required is 2+.0; kg/day

!A required is 3.,+/day

Nt*1 T* Ur*a a AP 2,ti2 ar* r*Dir* t 6** t* r2 a2tri*t 6r t* +icrrai2+2. I6? 6r ay r*a2? t* p,at i2 *pt 2t > * t

c,2r* 6 t* 6actry r 2+*ti ,i* ti2? *4* t* it >i,,


31/49


. C++i22ii 6 t* P,at

a. At first sufficient effluent is allowed in the equali8ation tank. After that aeration

should be continued. After aeration for about an hour or two the effluent is %um%ed to theflash mixing tank.

b. Lime and *errous Sul%hate solution should be dosed as soon as the effluentaccumulated in the flash mixing tank. Soon after dosing' the colour of the effluent will be

changed and the dissolved matters will form small flocks. The effluent will then be flown to

the flocculation tank by overflow and gravity %rinci%le.

c. olyelectrolyte is then dosed when the small sludge %articles will concentrated at thebottom of the tank.

d. *rom the flocculation tank the effluent is over flown to the tube settler 2 where the effluent

is flown u%wards through the tube media. >nder this condition a substantial amount ofsludge will be accumulated at the bottom of this settler tank.

e. The effluent is then goes to the %= correction channel due to the over flow. (t is necessaryto check the %= of the effluent at this stage and if the %= is above 4 then acid solution isdosed to bring down the %= within a range of .; to 3.;.

f. The effluent is then goes to the *luidi8ed Aerobic Biological reaction tank Z2 due to the

over flow and gravitation method. $icroorganisms like bacteria are seeded in *luidi8edAerobic Biological reaction tank Z2 P 7 tank' which is described in section 4.7.

g. )utrients are dosed in the *AB reactor for nursing microorganisms like bacteria. &hen this

tank is filled with' the effluent is then flows to the *luidi8ed Aerobic Biological reaction

tank Z 7. At this stage the remaining B!/1! will be reduced. *rom the *luidi8edAerobic Biological reaction tank Z 7' the effluent enters into the tube settler Z 7. This is

also ha%%en due to overflow.

h. As the effluent flows through the tube media the sludge is settled at the bottom of the tank.i. *rom the tube settler tank Z 7 the effluent goes to the filter feed sum% due to gravity. *rom

the filter feed sum% the effluent is %um%ed to the %ressure sand filter or Mranular $edia

*iltration5to remove carbonaceous B! and nitrogenous and residual in solubilised%hos%horous. This filter is also useful to %rotect the down stream Activated 1arbon *ilter

"A1*# from overloading by %ollutants such as %articulates' organics.

j. The effluent is then flows to the Activated 1arbon *ilter. 1arbon adsor%tion is a %roven%rocess in tertiary treatment for the %rocessing biologically treated wastewaters' and is one

of the many %rocesses used in the advanced treatment of wastewaters. The A1* is used to

remove relatively small quantities of refractory organics' as well as inorganic such as

sulfides and heavy metals remaining in an otherwise well5treated wastewater.k. The water at this stage is safe to be released into the environment.

02


32/49


:0. P,at St>

(n cases when the factory is ke%t shut down for a short %eriod of time then there will not be any

effluent' in that case it will be necessary to continue aeration and nutrient dosing in the *luidi8edAerobic Biological reaction tank Z 2 P 7' otherwise the bacteria will dye. (f the bacteria dye then

it will be necessary to seed bacteria again following section 4.7.

::. Mait*ac* 6 t* p,at

::.: $ar Scr**1

The bar screen should be cleaned everyday

::.; EDa,iati p+p1

The lube oil should be checked before starting the %um%. The valve of the suction line should be

o%ened and cleaned once every seven days.

::.3 F,a2 Mi-i a 6,cc,ati aitatr1

A%%ly lube oilbefore starting the agitator motor. The lube oil should be checked after every seven

days.

::. Air $,>*r1

1heck the lube oil before starting the air blower. (f there is no lube oil then a%%ly lube oil and startthe blower. The lube oil %um% should checked frequently.

::.B S,* tra26*r p+p a c*tri6* 6** p+p1

After starting the sludge transfer %um% and centrifuge feed %um% it should be observed for a short

%eriod of time. (f no sludge is found then sto% the %um% and o%en and clean the delivery line.

::.G Aitatr2 6 a,, t* 2i ta21

1heck the lube oil every seven5day. A%%ly lube oil if finishes.

::.J F,a2 +i-i? 6,cc,ati a t


33/49


::. Sa Fi,t*r1

(t is necessary to backwash the sand filter every eight hours.

::.:0 Car


34/49


,0. Effluent transfer %um% for equali8ation

tank.

Ty%e - =ori8ontal' 1entrifugal' non 1log

$odel5 X=)S)1a%acity - 0, m0 / =r.

=ead - 2 $&1$otor5 0.4 &' Folt5+,,' 0 ' ;, [.

O$5 7'6,, O$Yuantity5 2 "ne#

Si8e5 Suc. 53, $$ !el.5 ;, $$.

$aterial of construction5 1(Tem%erature - 3, ,1

rigin - (ndia.

&ith base frame' cou%ling' bolts etc.

,+ Air blower for equali8ation tank. Ty%e - Twin lobe' rotary air

1ooled' =ori8ontal$odel5Everest Transmission.

1a%acity - 22, m0 / =r.

!ischarge %ressure - +';,,$$&1$otor5 0.4 &' Folt5+,,' 0 ' ;,=8.

O$5 2'+;, O$

Yuantity5 2 "ne#

Si8e5 Suc. 5 2,, $$ !el.5 3, $$.$aterial of construction5 1(

rigin - (ndia.

&ith base frame' F belt' ressure gau8e'filter' silencer and non5return valve etc.

,; Air blower for biological reaction tank

Ty%e - Twin lobe' rotary air1ooled' =ori8ontal

$odel5 Everest Transmission.

1a%acity - ++, m0 / =r.!ischarge %ressure - ';,,$$&1

$otor5 2; &' Folt5+,,' 0 ' ;,=8.

O$5 2'+;, O$Yuantity5 2 "ne#

Si8e5 Suc. - 2,, $$ !el.5 3, $$.$aterial of construction5 1(

rigin - (ndia.&ith base frame' F belt' ressure gau8e'

filter' silencer and non5return valve etc.

0+


35/49


,. *lash $ixture $echanism. Ty%e - itch blade turbine im%eller

Fertical.$odel5 Aquatech5 *$5,0

1a%acity - =eavy duty' suitable for*lash mixing tank.

$otor5 2.; &' Folt5+,,' 0 ' ;,=8.O$5 2'+;, O$

Yuantity5 2 "ne#

$aterial of construction5 1(rigin - Bangladesh.

Mear box5 Aquatech

Oeduction ratio5 2;@ 2

,4. *locculation $ixture $echanism Ty%e - itch blade turbine im%eller

Fertical.$odel5 Aquatech5 *$5,0

1a%acity - =eavy duty' suitable for

*lash mixing tank.$otor5 2.; &' Folt5+,,' 0 ' ;,=8.

O$5 2'+;, O$

Yuantity5 2 "ne#$aterial of construction5 1(

rigin - Bangladesh.

Mear box5 AquatechOeduction ratio5 2;@ 2

,3 Tube Settler $edia for tube Settler Z 2 $aterial of construction5 F1 .$odel - Aquatech5 TS$5,0

Ty%e 5 =exagonal

(nclination angle - , ,deg.

0;


36/49


27 Sludge thickener mechanism.

Ty%e - Suitable of thickener tank$odel5 Aquatech5 ST$5,0

Yuantity5 2 " ne #

$aterial of construction - $ildSteel.

E%oxy %ainted.

$otor- 2.; &' Folt5+,,' 0 ' ;,=8

O$5 2',,, O$

Mear box5 reduction ratio. 5 4,@2rigin5 Bangladesh.

20 Sludge 1entrifuge for cake making.

1a%acity - 2,, g / batchYuantity5 2 "ne#$odel5 Aquatech5 =15,0

Ty%e5 =ydro extractor centrifuge

$aterial of construction - $ildsteel

Basket si8e5!ia53;, $$ W ;;,

$$$otor5 4.; &' F5+,,' 0 ' ;, =8.

SR. NO ESCRIPTION SPECIFICATION

,6 Tube Settler $edia for tube Settler Z 7

$aterial of construction5 F1 .$odel - Aquatech5 TS$5,0

Ty%e5 =exagonal

(nclination angle - , ,deg.

2,

Biological *AB $edia for biologicalOeaction tank Z 2 P 7.

Ty%e - 1orrugated$odel5 Aquatech5*AB5,0

Yuantity - 7 " Two #

$aterials of construction -

oly%ro%yleneSi8e5 7, $$ x 2 $$ height

rigin5 Bangladesh.

22 Aeration grids for biological reaction tank. Ty%e - Air diffuser$odel5 Aquatech 5,0

Yuantity5 2 Lot

Si8e5 3, $$' +, $$.

$aterial of construction5 U > UF1

Tem%erature - 3, ,1

rigin - Bangladesh.

0


37/49


O$5 2+;, O$

rigin - Bangladesh.

2+ *ilter feed sum% %um% Ty%e - =ori8ontal 1entrifugal

um%$odel5 Submersible1a%acity - 0, $0/ =r.

!ischarge %ressure5 2; $&1

=ead - 0; $&1$otor5 0.4; &' Folt5+,,' 0 ' ;,

[.

O$5 76,, O$Yuantity5 2 " ne #

Si8e5 Suc. 5; $$ !el.5 ;, $$.

$aterial of construction5

Body51(Tem%erature - 3, ,1

rigin - (ndia.

&ith base frame' cou%ling' boltsetc.

2; Less contaminated water %um% Ty%e - =ori8ontal/1entrifugal$odel5 Submersible/centrifugal

1a%acity - 0,$0/ =r.

!ischarge %ressure5 2; $&1=ead - 0; $&1

$otor5 0.4; &' Folt5+,,' 0 ' ;,

[.O$5 76,, O$Yuantity5 2 "ne#

Si8e5 Suc. 5; $$ !el.5 ;, $$.

$aterial of construction5Body51(

Tem%erature - 3, ,1

rigin - (ndia.&ith base frame' cou%ling' bolts

etc.

2 Thickener feed %um% for sludge sum%. Ty%e - =ori8ontal Screw %um%

$odel5 Al%ha =elical1a%acity - m0/hr.

!ischarge %ressure5 2; $&1=ead - 2 $&1

$otor5 0.4; &' Folt5+,,' 0 ' ;,

[.O$5 76,, O$

Yuantity5 7 "Two#

Si8e5 Suc. 5; $$ !el.5 ;, $$.

04


38/49


$aterial of construction5

Body51(Tem%erature - 3, ,1


etc

24 1entrifuge feed %um% of hydro extractor

*or sludge cake making

Ty%e - =ori8ontal' 1entrifugal'

Screw' non51log.$odel5 Al%ha =elical

1a%acity - ;$0/=r.


$otor5 2.; &' Folt5+,,' 0 ' ;,

[.

O$5 2'+;, O$Yuantity5 2 "ne#

Si8e5 Suc. 53, $$ !el.5 ;, $$.

$aterial of construction5Body51(

Tem%erature - 3, ,1


etc

26 Lime "1alcium hydroxide# re%aration tank

agitator mechanism.

Location of dosing - *lash mixing

Tank ca%acity - 2',,, liter.Yuantity5 2" ne#

$aterial of construction5 F1

Agitator mechanism5 2 " ne #$otor5 ,.4; &' F5+,,' 0 ' ;,

=8

O$ - 2,,, O$rigin5 Bangladesh ? (ndia

7, *eS+"*errous Sul%hate # %re%aration tank

agitator mechanism.

Location of dosing - *lash mixing

Tank ca%acity - 2',,, liter.Yuantity5 2"ne#

$aterial of construction5 F1Agitator mechanism5 2 "ne#$otor5 ,.4; &' F5+,,' 0 ' ;,

=8

O$ - 2,,, O$rigin5 Bangladesh ? (ndia

03


39/49


72 olyelectrolyte "E52,, N %urity# tank

agitator.

Location of dosing - *locculation

mixing.Tank ca%acity - 2',,, liter.

Yuantity5 2"ne#$aterial of construction5 F1

Agitator mechanism5 2 "ne#$otor5 ,.4; &' F5+,,' 0 ' ;,

=8

O$ - 2,,, O$rigin5 Bangladesh ? (ndia.

77 =1L "=ydrochloric acid# dosing tank

agitator mechanism

Location of dosing - = correction

mixing.

Tank ca%acity5 2,,, literYuantity - 2 "ne#

$aterial of construction - F170 )utrient ">rea P !A# dosing tank agitator

mechanism.Location of dosing - Biologicalreaction tank.

Tank ca%acity - 2',,, liter.

Yuantity5 2"ne#$aterial of construction5 F1

Agitator mechanism5 2 " ne #

$otor5 ,.4; &' F5+,,' 0 ' ;,=8

O$ - 2,,, O$

rigin5 Bangladesh ? (ndia.

7+ Activated carbon and sand filter feed

um%.

Ty%e - =ori8ontal'

1entrifugal/Sub$odel5 SB/X=)S)

1a%acity - 0,m0 / =r.


$otor5 4.; &' Folt5+,,' 0 ' ;,

[.O$5 2+;, O$

Yuantity5 2 "ne#

Si8e5 Suc. 53, $$ !el.5 ;, $$.$aterial of constructionBody51(

Tem%erature - 3, ,1


etc

06


40/49


7; ressure sand filter.

Yuantity5 2 "ne#

Ty%e5 !own flow.$odel5 Aquatech sand filter.

!iameter5 2',, $$=eight on straight5 2'3,, $$

!esign %ressure5 0.; kg/cm7$aterial of construction - $ild

steel

Treated flow rate5 0, m0 / =r!ee% of media5 6,, $$

$edia fill5 Sand media and Mravel

su%%ort.!uty5 *iltration.

7 Activated carbon filter Yuantity5 2 "ne#Ty%e5 !ownflow.

$odel5 Aquatech sand filter.

!iameter5 2',, $$=eight on straight5 2'3,, $$

!esign %ressure5 0.; kg/cm7

$aterial of construction - $ildsteel

Treated flow rate5 0, $0/ =r

!ee% of media5 6,, $$$edia fill5 Mranular Activated

carbon su%%ort.!uty5 *iltration.

74 (nterconnection %i%ing Yuantity5 2 "ne# lot

Butterfly valve' Mate valve' Elbow'Tee' *lange' ressure gauge' Ball

valve' )on return valve etc.

::.:E,*ctrica, Scp* 6 Spp,y

SR. NO It*+2 Uit

,2 Mlands for cables 2 Lot

,7 $otor "As required for the equi%ment listed in mechanical

List# 1rom%ton / irloskar/ 1hina

2 Lot

,0 $ain !istribution Board with $11B' $1B' Ammeter'

Foltmeter with selector switch' (ndicator lam%' verload relay

with com%lete distribution board.

2 "ne#

,+ ower cable from distribution board to different motor. 2 Lot

+,


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Local made

,; ower cable from different motor to o%erating %anel board 2 Lot

, Suitable cable tray made by $.S. angle P flat bar. 2 Lot

,4 Structural steel su%%ort for cable tray lying in the %lant. 2 Lot

+2


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:;. Li2t 6 App*i-*2

App*i-8I *2cripti a Op*rati 6 Pr*22r* Sa Fi,t*r & Acti4at* Car


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Ma-i++ >ri 1 3.B /c+;

J. Paiti *tai,2? It*ra, 1 Ep-y

E-t*ra, 1 At 6ir2t r* -i* a t* *p-yK. Spprt *tai,2 1 M.S c2trcti


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pr4i*.

. Ma,* *tai,2? N+


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The ressure Sand *ilter P Activated 1arbon *ilters are backwashed in staggered fashion which is

described below.

$ac>a2 6 PSF

The following ste%s to be followed

St*p8: Air 2cri 6 PSF

1lose inlet valve F2 and outlet Falve "i.e inlet valve F2 of A1*#. %en the air scouring valve F

P air vent valve F4. Switch on the blower and continue air scouring for about ; minutes. Air

scouring of S* is done to ensure thorough backwash of the filter.

Falve %osition

%en F 'F41lose F2'F0'F+'F;'F3'F6

St*p8; $ac>a2i 6 PSF

%en backwash inlet valve F0 and backwash outlet valve F+ . 1ontinue backwash of the filter for352, minutes. &ater during backwash flows in the u%ward direction thereby cleaning the filter off

dirt accumulated at the to% of the filter media . Backwash water comes out of backwash out let and

same shall be drained . *low rate for filter backwash shall be , m0/hr .

Falve %osition

%en F0 'F+' F31lose F2' 'F;'F'F4' F6

St*p83 Ri2i 6 PSF

1lose backwash inlet P out let i.e. F0 P F+ and o%en service inlet valve F2 and rinse out let

valve F;. Oinse water comes out of backwash outlet and the same shall be drained. 1ontinuerinsing for ; minutes. Oinse flow rate shall be same as service flow rate i.e. 0,m0/hr.

Falve %osition

%en F2 'F;1lose F0' 'F+'F'F4'F3'F6

$. $ac>a2 6 ACF

St*p8: $ac>a2i 6 ACF

1lose rinse outlet valve F; of S*' service inlet and outlet valve F2 P F7 of A1*. %en

backwash inlet and outlet valve F0 P F+ of A1*. Backwash water flows in u%ward direction in

+;


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A1* thereby backwashing the media. 1ontinue backwashing for about 2,52; minutes . Backwash

water comes out from backwash outlet and the same shall be drained .*low rate for A1* backwash

0, m0/hr.

Falve %osition

%en A1* F0 'F+' F3

1lose A1* F2' 'F7'F;'F'F4'F6 S* All the valve of sand filter close

St*p8; Ri2i 6 ACF.

)ow close the backwash inlet P outlet valve F0 P F+ of the A1* . %en service inlet valve F2 of

S* and service inlet P outlet valve F2 P F7 of A1* rinse outlet valve F;. 1ontinue rinsing forabout 05; minutes. Oinse water comes out from backwash outlet and the same shall be drained.

*low rate for A1* rinsing 0,m0

/hr.

Falve %osition

%en A1* F2 'F;' F3

S* only F2' F3 "All the other valve of S* closed #1lose A1* F7'F0'F+ 'F'F4'F6

St*p83 ACF i 2*r4ic* +*.

Falve %osition

%en A1* F2 ' F3' F7 all the other valves closed.*or valve number refer interconnecting %i%ing diagram of S* and A1*

+


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App*i-8II T*cica, i6r+ati a


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App*i-8III T*cica, i6r+ati a


49/49


App*i-8I' I6r+ati a

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6949495 Etp Manual Std@Aquatech

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