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Zero Discharge Sewage Treatment Plant Reuse of treated ... TN Project... · Green STP/AD+ Model No....

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www.chemtronicsindia.com Page 1 of 19 Client : First & Foremost Hotels & Resort - Maldives Technology – “Green STP AD+” Zero Discharge Sewage Treatment Plant Reuse of treated water for Landscape & Irrigation Date: 08 th April 2017 – Mumbai [INDIA]
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Client:First&ForemostHotels&Resort-Maldives

Technology–“GreenSTPAD+”

ZeroDischargeSewageTreatmentPlant

ReuseoftreatedwaterforLandscape&Irrigation

Date:08thApril2017–Mumbai[INDIA]

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Preamble

The environment of Maldives comprises of a delicate and complex series of ecosystemswhich isuniquetothetropicalworldandmanyhavefounditapleasuretogazeupon.Currentissuesincludedbeacherosion,coralmining,freshwaterresources,wastedisposalandsewagedisposal.

Oneof themajor threats toenvironment isdisposalof sewage. Sewageposesa seriesofpotentialproblems depending on the mode of disposal, discharges of raw and untreated sewage into themarine environment which tends to cause nutrient enrichment algal blooms, sea-grass, de-oxygenation. Such conditions adversely affect coral growth. Sewage related problems are amajorconcernaroundthedenselypopulatedislandsandsometouristresorts.

Waste water (domestic sewage water) reuse is emerging as an alternative resource. It allowsincrease in the supplyofwater resourcesand reducespollutionproblemsbecause itprevents thedischarge of waste water into the environment. Feasibility of Water Reuse project is currentlysubjectedtoeconomicassessment.

Maldivesislandsdoesnothavenaturalsourceofwater,soallpotablewaterdemandiscateredbyseawater,usingdesalinationplant.Also,tooperatedesalinationplantelectricityisproducedfromdieselgenerators. The “GREEN STP AD+” converts domestic sewage water into nutrient rich irrigationwater.So,using this treatedwater the fresh (desalination)waterdemandsignificantlygoesdown,savingcapital&operatingcostofthedesalination.

Considering the remote location of the site, we have proposed self-sustained, scientificallydeveloped,naturalrecyclingtreatmentplant,withleastoperation&maintenancecomparedtoanytechnologyintheworld.

Copyright:

“All contents copyright by Chemtronics Technologies (I) Pvt. Ltd. – India & Autark Engineering – Switzerland. All rights reserved. No part of this document or the related files may be reproduced or transmitted in any form, by any means (electronic, photocopying, recording, or otherwise) without the prior written permission of the publisher.

Please note that much of this publication is based on personal experience and anecdotal evidence. Although the author and publisher have made every reasonable attempt to achieve complete accuracy of the content in this Guide, they assume no responsibility for errors or omissions. Also, you should use this information as you see fit, and at your own risk. Your particular situation may not be exactly suited to the examples illustrated here; in fact, it's likely that they won't be the same, and you should adjust your use of the information and recommendations accordingly.

Any trademarks, service marks, product names or named features are assumed to be the property of their respective owners, and are used only for reference. There is no implied endorsement if we use one of these terms.”

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INDEX

1. Preamble .......................................................... Page2

2. ProjectProponent ....... ............................................ Page4

3. Objective ........................................................... Page4

4. WaterBalance/Budget ............................................ Page5

4.1 ClientsData................................................... Page5

4.2 DesignConsideration&Estimation ........................ Page5

4.3 WaterQuality–Raw&Treated............................... Page5

5. TreatmentTechnology ............................................ Page6

5.1 Concept ............................................ Page6

5.2 Coretreatment ............................................ Page6

5.3 SalientFeatures ............................................ Page7

5.4 Advantages ............................................ Page8

6. ProcessDescription ............................................ Page9

6.1 PrimaryTreatment .................................... Page9

6.2 SecondaryTreatment ..................................... Page9

6.3 TertiaryTreatment........................................... Page10

7. ProcessFlowDiagram ............................................ Page11

8. TechnicalSpecification ............................................ Page13

8.1 ADTankOption1[Civil]...................................... Page14

8.2 AdTankOption2 [Pre-fabricated]............................ Page15

8.3 FootPrint–Equipment....................................... Page17

8.4 PowerRating ..................................... Page17

8.5 ReclaimEfficiency ..................................... Page17

8.6 LifeSpan .............................................. Page17

9. Operation&Maintenance ............................................ Page18

10. Consumables ............................................ Page18

10.1 Chemical ............................................ Page18

10.2 ManPower ............................................ Page18

10.3 Electricity ............................................ Page18

10.4 Spares ............................................ Page18

11. AnnualMaintenanceContract......................................... Page19

12. CapitalCost ......................................................... Page19

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ProjectProponent

Nameoftheproject : First&ForemostHotels&ResortatMaldives

Requirement : SewageTreatmentPlant

Typeofproject : ResortVillas&Staffquarters

ApplicationofTreatedWater : Landirrigation,WCflushinginstaffquarters&anyother

non-potableapplications

Locationoftheproject : Maldives.

Objective

ü NaturalSelf-Sustaineddesign

ü LeastpossibleOperation&Maintenance

ü MostEnergyefficienttechnology

ü Maximumrecoveryofwater

ü LowerFootprint

ü EnvironmentalFriendly

ü Nofoulodor

ü Longlifespan

ü Economical–CapitalCost

ü Simpletooperate

ü MeetsInternationalPollutionStandards

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WaterBalance/Budget

Theplantisdesignedtotreatsewagegeneratedofhavingfollowingdetails.

ClientData

SourceofWasteWater : DomesticWasteWatergeneratedfromResort,Kitchen,Laundry,SwimmingPoolBackwashWater,Bathroom,StaffQuarters,WC,Washbasin,etc.

NumberofGuestRooms : 76nos.

NumberofStaff : __________nos.

ApplicationofTreatedWater : Landirrigation&Gardening

DesignConsideration&Estimation

Waterrequireperperson : __________litersperday

TotalSewageWaterCapacity : 90KLD(asperclient90KLDisproducedperday)

PlantOperatingHrs : 22–24HRs

PlantFlowRate : 4.5m3/hr

Treatment : AnaerobicDigestion[AD]+Polishing+Ozonation

GreenSTP/AD+ModelNo. : AD+/STP-90

WaterQuality–RawSewage&Treated/Recycled

Parameters RawSewageWaterQuality

TreatedWaterQualityForReuse

Color Slightlybrownish Clear

Odor Characteristic Unobjectionable

pH 5.0–8.0 5.5–8.0

TSS 100–150ppm ≤1ppm

BOD(3days28⁰C) 150–200ppm ≤10ppm

COD 300–450ppm ≤100ppm

Oil&Grease 20–25ppm ≤10ppm

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TreatmentTechnology

Concept-GreenSTPAD+

Green STPAD+ combines state of the artHighRateAnaerobicReactor (HRAR) technologywith aselection of adequate tertiary treatment methods of filtration & disinfection. This full-blowndecentralizedwastewatertreatmentandreusesystemsisalignedwiththeprojectspecificconditionsand requirements. We provide our clients custom and tailored wastewater solutions withoutstandingeconomicandecologicperformanceswhilemakingmaximalbenefitoutofon-sitereuseof products out ofwastewater treatment. Our STPs are engineered to complywith the respectiveregulationsandnorms.

AD+[AnaerobicDigestion+]isawastewatertreatment,particularlysuitedtoorganicmaterial&iscommonlyusedforeffluent,sewage&greywatertreatment.Anaerobicwastewatertreatmentisabiologicaltreatmentwithouttheuseofairorelementaloxygen.Manygroupsofanaerobicbacteriawork together inabsenceofoxygentodegradecomplexorganicpollutants intomethane/biogasandcarbondioxide.Inanaerobicdigestionthemicro-organismsresponsiblefortheconversionoftheorganicmatterortheotherconstituentsinthewastewatertogases&celltissuesaremaintainedin-suspensionwithin the liquid. Anaerobic digestion is a simple process that can greatly reduce theorganicmatterwithoutusinganyotherresource&anyformofenergy.

CoreTreatment-HighRateAnaerobicReactorTechnology

HighRateAnaerobicReactors(HRAR)refers tobioreactorswhichcanretainactivebiomass in thereactorindependentlyoftheincomingwastewater(HydraulicResidenceTimeHRT).Slowgrowinganaerobescanbemaintainedinthereactorsathighconcentrations,enablinghighreactionrateperunit reactorvolumeandhighresistanceoforganicorhydraulic shock loads.HRARcanbeused totreat wastewater from various sources and strengths like waste water from domestic sources,hospitalsandindustrieslikedistilleriesorfood-processing.TheHRARweusearecascadedinseriestomulti-stepanaerobicsystems,enablingseparationoftheanaerobic treatment steps (Hydrolysis/Acidogenesis/Acetogenesis/Methanogenesis) withoutdifficult process controlling. With respect to sustainability and cost- effectiveness, anaerobictreatmenthas the coreadvantageof avoiding the lossof energy fordestructionoforganicmatter,whileenergyisreclaimedfromtheorganicwasteconstituentsintheformofmethaneinbiogas.

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SalientFeatures:

* OverallOrganic&Inorganiccontentreduction(BOD,COD&TSS)withcolor&odor.

* TreatedSewageWaterQuality -MostsuitedforIrrigation&Landscape.

* EnergyEfficiency -Highest–50–90%lessconsumption

* Sustainability -SelfSustained[Autark]

* ReusableOutput -Highest–morethan99%

* Operation&Maintenance -Least–Operatornotrequired

* SludgeManagement -Least–OnceinaYear

* Consumables -Minimum

* LifeSpan -VeryHigh–100Years[CoreTechnology]

* FootPrint -Minimum60–80%less

* Nutrients -Rich

* Process&Technology/R&D -GREENSTPAD+fromSwitzerland

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Advantages–HRAR[AD]:

* LowProcessControl

* LowProcessEnergy

* NoChemicals

* LowSludgeProduction

* MLSSandSVImonitoringnotrequired

* EnergyGenerationintheformofBiogas

* MinimumMechanical&ElectricalParts

* UnderGroundStructure(Canbeaboveground)

* HighShockLoadResistance[Organic&Hydraulic]

* HighTreatmentPerformanceInTermsOfCOD,BOD&TSS

* Self-Sustained

* ReclaimedWatermorethan99.0%

* Innovativestillnaturaltreatmentprocess

* Energyefficient.60–90%lesserpower

* Extremelystabletohydraulicshockloads

* Hightreatmentperformance

* Lowoperatingcost

* Lowspacerequired–beingsubsoil

* Nofoulodour

* Longlife–atleast50years

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ProcessDescription

PrimaryTreatment

Screening: - This is the first unit of the Green STP AD+. Sewage water from sewage collectionchamberiscollectedintoanADtankthroughabarscreenbygravity.Barscreenisprovidedtotrapfloatingmaterialslikeleaf,flowers,cottons,plastic,halfeatenfood,papers,etc.Oil&GreaseChamber: - Sewagewater from the kitchenwhich contains free oil, if not removedcreates scum accumulation and affects the functioning ofmicrobes. To avoid this, oil & grease, achamberisprovidedafterthebarscreenwherefreefloatingmaterialoilisarrestedpriortoentryintheADTank.Accumulatedoilwillberemovedperiodicallyanddisposedofproperly.

SecondaryTreatment

BiologicalTreatment:-

SewagefromOil&GreasechamberwillpassthroughtheADTank.TheADTankisacascadeofthreemajor treatments steps i.e. Settler,HighRateAnaerobicReactor [HRAR]/AnaerobicBaffleReactor[ABR]andupflowAnaerobicFilterwhichisconstructedbelowgroundlevel.Thesethreedifferentphases are built together in a single AD Tank with interconnecting compartments. The AD Tankperformsthecoretreatmentofthesewagewateroxidization&decompositionoforganicpollutantwith the help of anaerobicmicroorganism to provide higher surface area formicro – organisms,floating random media is provided, on which micro- organisms growth takes place. Generallyactivation of AD tank with full sewage load can take 40 to 50 days and come to its optimumefficiency.

1. Settler

The first compartment ofADTank is a settler. The settler has two treatment processes. First is asedimentationinwhichtheliquidpartisseparatedfromthesolidmatterandsecondisstabilization,whichsettlesoutmostofthesolidsinthewastewater.

2. HighRateAnaerobicReactor/AnaerobicBaffleReactor(HRAR/ABR)

In this treatment phase, biological and natural chemical processes are used to digest and removemostoftheorganicmatter.Inthishighrateanaerobicreactor,withoutoxygenmechanicalmixingisapplied.Treatmentisachievedbyanaerobicdigestionbynaturallyselectedanaerobicmicrobial.Thisgivesgoodretentiontimetowastewateranddevelopmentofathicksludgeblanketinthebottomofcompartment.

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Fig.1,AnaerobicDigester[AD]Tank–CivilOnSiteConstruction

3. UpflowAnaerobicFilter

After the HRAR/ABR Treatment sewage water is transferred into up flow Anaerobic Filtercompartment inorder to improve further treatmentefficiency, a filtermediaallowingwidespreadcontactwiththewastewaterstreamisusedwhichisveryefficientinretaininganddigestingtheleftoverpollutants.Theprocessworkswithfixedplasticbiomedia.Thewastewaterpassingoutoftheanaerobicfiltershas90%oftheoriginalpollutionloadremoval.

PolishingTertiaryTreatment

Secondary (biological) treated water from AD Tank will be collected in a equalization tank. Thistreatedwaterisozonatedforpathogendisinfection.Ozonationalsoreducesfoulodor&tintofcolor,if present in treatedwater. PostOzonationwater is filtered by “ChargedActivatedMedia Filter[CAMF]” through a filter feed pump to trap tiny suspended particles from water. Ozonation oftreatedsewagewaterreducetinyorganicandinorganicimpuritiesfromwater.FrombackwashcumTreatedWaterTankwater isused forbackwashingof filters. From this tankwaterwillbefurthercollectedinmaintreatedwatertank.

Equalization

HRAR

BarScreen

UFAF

Settler

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Fig.2,TertiaryTreatment:ChargedActivatedPressureFiltration+OnlineOzonation

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ProcessFlowDiagram

Fig.3,ProcessFlowDiagramof“GreenSTPAD+”

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TechnicalSpecification

Therearefouroptionsforanaerobictankconstruction:

Option1[A]–CivilTankConstructionUnderGround

Option1[B]–CivilTankConstructionAboveGround

Option2[A]–Pre-FabricatedHDPETanksUnderGround

Option2[B]–Pre-FabricatedHDPETanksAboveGround

Inoption1[A]or1[B],theconstructionofthesewagecollectioncumtreatmenttank&treatedwatertanksaretobeconstructedonsitebyyourcivilcontractor&wewillgiveyouthedimensionaldrawings.Thebio-media&pipegridwillbeinstalledbyourteam,afterthetankisconstructed&beforetheconstructionoftopslab.Also,thetertiarytreatmentplantwillbesupplied&installedbyourteam.

Inoption2[A]or2[B],thesewagecollectioncumtreatmenttank&treatedwatertankwillbepre-fabricatedinourfactory&alongwithtertiarytreatmentplantwillbedeliveredtoyoursite.

Inanyoftheoptedoption,oncethetanksareready,theywillbeinoculatedforanaerobicbacteriaatthesite.

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Option1–CivilConstruction

FootPrint–ADTank

Fig.4,ADTank,OxidationTank&FinalTreatedWaterTankcanbelocatedbelowlandscape

Fig.5,ADTank,OxidationTank&FinalTreatedWaterTankcanbelocatedbelowcarpark.

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Fig.6,ADTank,OxidationTank,FinalTreatedWaterTank&PlantRoom.

ADTank : UnderGround/AboveGround :250m2[Area]X3.0m[Depth]

OxidationTank : UnderGround/AboveGround :10m2[Area]X3.0m[Depth]

TreatedWaterTank: UnderGround/AboveGround :10m2[Area]X3.0m[Depth]

PlantRoom : AboveGround :15m2[Area]X3.0m[Depth]

TotalAreaRequired: UnderGround/AboveGround :285m2[Area]x3.0m[Depth]

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Option2–Pre-fabricatedConstruction

Fig.7,Pre-fabricatedADTank,OxidationTank,FinalTreatedWaterTank&PlantRoom.

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FootPrint–Equipment

ADTank : AboveorBelowGround : 285–300m2x3.0m[Ht/depth]

PlantRoom : AboveGround : 15–18m2x3.0m[Height]

PowerRating

ABR+AF : 0.0Kw

TertiaryTreatment : 1.0Kw

Ozonation : 1.6Kw

TotalPowerRating : 2.6Kw

ReclaimEfficiency

TreatedWaterQuantity : 90KLD : 95–97%Recovery

BiogasProduction : 5.0m3/day : Electricityof10kw/day*

*at50%efficiency.

Lifespane

ADTank–CoreTreatment : 50Years

TertiaryTreatment : 50Years

OzonationPlant : 20Years

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Operation&Maintenance

In AD tank waste water flows naturally by gravity. Tertiary treatment & disinfection process isautomaticanddoesnotrequireanyoperator.Onlyaparttimenon-technicaloperatorisrequiredforgeneral supervision & log keeping. Sludge management is also minimal & does not demand forfrequentsludgehandling.

Maintenance&ReplacementFrequency

SludgeMonitoring : Oncein6Months

Sludgeinspection : Oncein6Months

SludgeMaintenance : Settler : OnceinaYear

ABR/AF : Oncein3-4Years

Consumables

Chemicals

NoConsumablechemicalsarerequired.

ManPower

Non-technicaloperatorisrequiredforparttime. : 1hr/day

Electricity

BasicSewagetreatmentplant :24units/day :0.27Kw/m3

Ozonation :38units/day :0.42Kw/m3

Total :62units/day :0.69Kw/m3

Spares

ABR&AF : Nospares

TertiaryTreatment : FilteringMedia : 50Years

OzoneGenerator : OzoneCell : 2Years

OxygenGenerator : MolecularSelves : 2Years

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AnnualMaintenanceContract

Annualmaintenancecontractisavailableposthandoverduringwarrantyperiod&postwarranty,forrestofplantlife.

CapitalCost

Option1–CivicConstruction

CivilTankConstruction : ClientsScope–Chemtronicswillprovidedimensionaldrawing

EquipmentSupply : USD30,000

Installation&Commissioning : USD500perdayperperson+To&froAirfare+LocalConveyance+Food+Accommodation

EstimatedtimeforI&C : AdTank -2persons-10days Equipment -2persons-6days

Inoculation –2persons-6daysTotal -2persons–22–25days

Equipmentdelivery : 8–10weeks

Option2–Pre-fabricatedConstruction

Prefabricatedtanks&EquipmentSupply : USD150,000

Installation&Commissioning : USD500perdayperperson+To&froAirfare+LocalConveyance+Food+Accommodation

EstimatedtimeforI&C : -2persons-10-15daysTanks&Equipmentdelivery : 10–12weeks


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