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TOPIC

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NAME ROLL NO.

SHAHANAZ KURESHI 166

MANDAR MADAYE 155

ASHISH DIXIT 115

SONAL

JAGDISH

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Introduction

Wateris mostsignificantelementoftheearth.Waterisessentialfor

PowerGeneration

avigation

IrrigationOf

Crops

DisposalOf ewage.

verincreasingdemandofwaterinvarioussectorshas

degradedthe qualityofwatertoagreatextent.

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` Accordingtoreport 1965,

Waterpollution may bedefinedasalterationin

physical;chemicaland biologicalcharacteristicsof

waterwhich maycauseharmfuleffectsonhumanandaquaticlife.

` Accordingtoreport 1976,

Theterm waterpollutionreferstodeteriorationin

chemical;physicaland biologicalpropertiesofwaterbroughtabout byhumanactivitiesorby

naturalprocess.

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` Surfacewaterpollution.

RiverPollution

LakewaterPollution

SeawaterPollution

` Groundwaterpollution.

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` Onthe basisofsourceofpollutants

` Onthe basisofphysicalandchemicalproperties

` Degradableandnondegradablepollutants

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` UNTREATED INDUSTRIAL EFFLUENTS.

` HEATED EFFLUENTWATERS.

` MINING.

` AGROCHEMICALS.` DOMESTICWASTESAND SEWAGEWATER.

` SLITAND SEDIMENTS.

` OIL SPILLS.

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` Oil Spill Clean-up

` WorkersusespecialnetstocleanupaCaliforniabeachafteranoiltankerspill.Tankerspillsareanincreasingenvironmentalproblem becauseonceoil

hasspilled,itisvirtuallyimpossibletocompletelyremoveorcontainit.Evensmallamountsspreadrapidlyacrosslargeareasofwater. Becauseoilandwaterdonot mix,theoilfloatsonthewaterandthenwashesupon broadexpansesofshoreline.Attempts

tochemicallytreatorsinktheoil mayfurtherdisruptmarineand beachecosystems.

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` Rawsewageincludeswastefrom sinks,toilets,andindustrialprocesses.Treatmentofthesewageisrequired beforeitcan besafely buried,used,orreleased backintolocalwatersystems.Inatreatmentplant,thewasteispassedthroughaseriesofscreens,chambers,andchemicalprocessestoreduceits bulkandtoxicity.Thethreegeneralphasesoftreatmentareprimary,secondary,andtertiary. Duringprimarytreatment,alargepercentageofthesuspendedsolidsandinorganic materialisremovedfrom thesewage.Thefocusofsecondarytreatmentisreducingorganic material byacceleratingnatural biologicalprocesses.Tertiarytreatmentisnecessarywhenthewaterwill bereused; 99 percentofsolidsareremovedandvariouschemical

processesareusedtoensurethewaterisasfreefrom impurityaspossible.

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