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AsperIndianPollutionControlBoardnormsitismandatorytoreusetreatedwastewaterfornon-potable applications. These applications can be WC flushing, landscape irrigation, cooling towermakeup, floor&glasswashing,diluteanyotherstreamofwastewater,sell tootheragencies,etc.Indian Green Building Council [IGBC] encourages designers to use Energy efficient technology byofferinghigherratingin“LEED”certification.Itisalsomandatorytouseozonetechnology,insteadofchlorine sincedisinfectantsBy-Products [DBPs] arequitenegligible, andozone technology isnon-hazardous&environmentallysafe.
Chemtronicswith alongwith its Switzerland partner has developed a “GREEN STPAD+”which isself-sustained, and conserves water up to the efficiency of more than 95 %. The core treatmentworksonnaturalanaerobicdegradationprocesswithgravityflow&doesnotrequireanyenergytotreatwastewater asperpollutionnorms.Thisunique technologyproduces energy in the formofbiogas to make treated waste comfortably reusable. Ozonation is an integrated as a part of highefficiencytertiarytreatmentproducinghighqualityresults.
Since entire anaerobic tank can bemade underground, it requires very small foot print for plantroomarea.Alsothereisnoneedofanyairhandlingsystemandfoulodormechanismrequiredasalltanksareairtight.TheADtankhasestimatedlifeof100years&issoself-sustainedthatitdoesnotrequire any qualified teamof operators. The processes by product are liquid& gas, due towhichfrequencyofsludgehandlingisonceortwiceayear.
Considering the remote location of the site, we have proposed self-sustained, scientificallydeveloped,naturalrecyclingtreatmentplant,withleastoperation&maintenancecomparedtoanytechnologyintheworld.
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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.
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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.SalientFeatures:
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.
In this treatment phase, biological and natural chemical processes are used to digest and removemostoftheorganicmatter.Inthishighrateanaerobicreactor,withoutoxygenmechanicalmixingisapplied.Treatmentisachievedbyanaerobicdigestionbynaturallyselectedanaerobicmicrobial.Thisgivesgoodretentiontimetowastewateranddevelopmentofathicksludgeblanketinthebottomofcompartment.
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.AsperMPCB,OzonationinSTPtertiarytreatmentismandatory.
Inoption1,theconstructionofthesewagecollectioncumtreatmenttank&treatedwatertanksareto be constructed on site below ground by your civil contractor & we will give the dimensionaldrawings.Inoption2theconstructionofthesewagecollectioncumtreatmenttank&treatedwatertanksaretobeconstructedaboveground.Thebio-media&pipegridwillbeinstalledbyourteam,afterthetankisconstructedalongwiththeconstructionoftopslab.Also,thetertiarytreatmentplantwillbesupplied&installedbyourteam.
InADtankwastewaterflowsnaturallybygravity.Tertiarytreatment&disinfectionprocesscanbeautomaticanddoesnotrequireanyoperator.Onlyaparttimenon-technicaloperatorisrequiredforgeneral supervision & log keeping. Sludge management is also minimal & does not demand forfrequentsludgehandling.