Water Analysis & Control. Water analysis & control WATSAN M15 ERU 2 Contents 1.Chemical parameters...

Water Analysis & Control

2Water analysis & controlWATSAN M15 ERUWATSAN M15 ERU

Contents

1. Chemical parameters and ranges

2. Water sources: Sampling procedures

3. Laboratory

4. Water sources: Analysis implementation and recording

5. Water treatment: Analysis implementation and recording

6. Water quality control process summary


1. Chemical parameters and ranges


• Turbidity: Suspended matter that acts a shield protecting virus and bacteria against their destruction by a disinfectant plus the dirtiness and unpleasant visual and tasting aspects.

• pH: Measure of water acidity or alkalinity. It has to have certain value to in order to Aluminium Sulphate being effective.

• Coliforms: Presence of faecal matter that might cause a whole range of diarrheic diseases that can be fatal.

• Nitrates: They are not toxic but they show the presence of fertilizers and other compounds more dangerous such as nitrites.

• Nitrites: They are harmful for human health. In high concentrations, they show the presence of industrial contamination an/or domestic waste water.

CHEMICAL PARAMETERS


• Aluminium: It is important to determine that the quantity of Aluminium Sulphate added to a water treatment process is not excessive. Otherwise, high concentrations of this compound might be harmful to humans.

• Hardness: Hardness is due to Magnesium and Calcium salts. It is no related to health problems although it produces very unpleasant taste when values are higher than those recommended by WHO.

• Conductivity: It is an indicator of water salinity that must not be higher than certain limits, otherwise it might be harmful to health. Salt water has a conductivity of 45,000 µS/cm and average fresh water conductivity is less than 2.500 µS/cm.

CHEMICAL PARAMETERS


Turbidity (In the water mains) ≤ 5 NTU

pH 6,5 ≤ ≤ 9,5

Coliforms 0 CFU in 100 ml

Nitrates ≤ 50 mg/l

Nitrites (In the water mains) ≤ 0,5 mg/l

Hardness

There are not specific values to consider :Soft water ≤ 17 mg/lHard water ≤ 180 mg/lVery hard water > 180 mg/l

Conductivity ≤ 2.500 µS/cm (20ºC)

Aluminium ≤ 0,2 mg/l

Free Chlorine ≤ 1,0 mg/l

RANGES ---------- SPANISH LEGISLATION


Guidelines for Drinking-water quality

Nitrates (as NO3-) ≤ 50 mg/l Medium term exposure

Nitrites (as NO2-)

≤ 3 mg/l Short term exposure

≤ 0.2 mg/l

Medium term exposure

Free residual chlorine ≥ 0.5 mg/l

For an effective disinfection there must be a residual concentration of free chlorine of ≥0.5 mg/litre after a minimum contact time of 30 min with a pH <8.0

Aluminium ≤ 0,2 mg/l

RANGES ------- WORLD HELATH ORGANISATION


pH = 6,5 – 9

Cl- (water distribution) ≈ 0,6 -1 ppm (check with local authorities)

Conductivity < 2.500 µS/cm (20ºC)

Nitrites = 0,5 ppm. (see note)

Nitrates = 50 ppm. (see note)

Aluminium = 0,2 ppm

Bacteriological = 0 cfu (water consumption point)

Note: Ensure that the value of 0,10 mg/l for nitrites is met at the outlet of water treatment facilities. Likewise, the condition that [nitrates]/50 + [nitrites]/3 # 1 is observed, where the brackets mean concentrations in mg/l for nitrates (NO-

3) and for nitrites (NO-2).

RANGES ------- EUROPEAN UNION (Directive 98-83 CE)


Concentration: Concentration: 1 g/m3 <> 1 mg/l<> 1 ppm 1 g <> 1000 mg 1 m3 <> 1000 l 1 mg <> 1.000 mg 1 mg/l <> 1000 mg/lTurbidity:Turbidity: NTU (Nephelometric Turbidity Unit )

Coliforms:Coliforms: cfu (colony forming unit)

Conductivity:Conductivity: µS/cm

UNITS


2. Water sources: Sampling procedures


SAMPLING PROCEDURE

The way that sampling

is carried out

might definitely distort

the final results.


Sampling is carried out in representative manner.

Date, time, sampling location are registered (Field log book).

Samples kept in safe and cool place.

Always value how, where and why a water source is selected, ensuring that the water can be treatable and safe for human consumption.

SAMPLING PROCEDURE


1. Avoid any direct contact with water If feasible. It might be sufficient to acquire diseases.

SAMPLING PROCEDURE


2. Take sample where properties are best describing the source. For instance, we will avoid the vicinities of a sewage discharge pipe.

3. Avoid the surface or the bottom since due to flotation or sedimentation these concentrate materials, chemicals, bacteria… Sample is best taken 30 cm below surface.


5. If sampling piped water, leave running for 1 minute before taking the sample.

6. Do not allow foreign material or waters to touch water collecting vessel.

4. Clean sample collecting vessel with sample water, never with chemical or other water, including tap water.

7. Label results with appropriate information, date, place and any other parameter that may hold importance (Field Log Book)


3. Laboratory


TEST CAPABILITY

Turbidity pH Coliforms Nitrates

Nitrites Aluminium Chlorine Hardness

Conductivity Temperature Jar test

Chlorine demand essay

LABORATORY


LABORATORY MAINTENANCE

IMPORTANT• Always handled the equipment with care. It is fragile.

• Carefully clean and dry all items before introducing them in the laboratory box.

• Protect the most fragile items with appropriate packaging.

• Dispose the items in the right place inside the laboratory box.

• Be organised and methodical when using the items and chemicals, and implementing any test.


4. Water sources: Analysis implementation & recording


OXFAM DELAGUA KIT

• Coliforms

• Turbidity

• pH

• Chlorine


TURBIDITY


pH


NITRATES


NITRITES


CONDUCTIVITY


Date

Source Nº

Date

Source Nº

Date

Source Nº

Date

Source Nº

Coliforms(Nº x 100ml)

Hardness (mg/l)

Conductivity (µS/cm)

pH Nitrates (mg/l)

Nitrites (mg/l)

Turbidity (NTU)

SELECTION OF WATER SOURCES

≤ 180 ≤ 2.500 6,5 ≤ ≤ 9,5 ≤ 50 ≤ 0,5


5. Water treatment: Analysis implementation & recording


TURBIDITY


TURBIDITY Dosage pump (%)

Turbidity after treatment (NTU)

Turbidityafter pre-treatment (NTU)

Turbidity water source (NTU)

Date

(Turbidity tests are needed on weekly basis and when visual inspection shows some changes in water qualities)

≤ 5

≤ 20


ALUMINIUM


COLIFORMS, ALUMINIUM AND HARDNESS

(Outlet of water treatment plant)

Hardness (mg/l)

Aluminum (mg/l)

Coeliforms (Nº x 100ml)

Date

0 CFU

≤ 0,2


CHLORINE


DATE____________ SITE____________________

RESIDUAL CHLORINE (mg/l)

Time Place

3rd chamber Dosage pump (%)

Outlet of WTP

Dosage pump (%)

Chlorine at the exit of the settlement tank: 0,1 mg/l – 0.3 mg/lResidual chlorine at the exit of the plant: 0.6 mg/l – 1.0 mg/l

0.1 – 0.3 0.6 – 1.0


WATER DISTRIBUTION. RESIDUAL CHLORINE

This table records the residual chlorine data obtained in the different places where the treated water from the SRC site is supplied.

Samples should be taken from the taps. It is also convenient to specify where the water is supplied from a static tank or from a tanker directly to the users. The samples can be taken daily or randomly in different days.

Place Date & Time

Chlorine

Residual chlorine at the taps: 0.3 mg/l – 0.6 mg/l


6. Water quality control process summary

Chlorine = 0.6 mg/l – 1.0 mg/l Aluminium < 0.2 mg/l

6 < pH < 8Nitrates < 50mg/lNitrites < 0.5 mg/lConductivity < 2,000 µS/cmTurbidity = NTU as low as possible

WATER ANALYSISTurbidity > 20 NTU:Aluminium Sulphate (Jar Test)

WATER TREATMENT PLANT

Turbidity ≤ 20 NTU

Chlorine = 0.1mg/l – 0.3 mg/lTurbidity ≤ 5 NTU

Chlorine = 0.3 mg/l – 0.6mg/l


Thank youThank you……….……….

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Water Analysis & Control. Water analysis & control WATSAN M15 ERU 2 Contents 1.Chemical parameters...

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