Wastewater Treatment

SEWAGE TREATMENT PLANTA PRESENTATION ON...SUBMITTED TO:- HOD :- Prof. RUBY ( CIVIL ENGG. )PRESENTED BY :- ANUJ KUMAR (B.Tech CIVIL 3rd YEAR)DEPARTMENT OF CIVIL ENGG.ARYAN INSTITUTE OF TECHNOLGY GHAZIABAD

Wastewater from your shower, bathtub, washing machine, dishwasher, kitchen sink and toilet is all considered sewage - it isn't just from the toilet. Interestingly, sewage is actually 99.8% water.KitchenLaundryWash BasinsBath rooms & ToiletsFloor WashIn one word, it is all the wastewater that comes out of homes / human useWhat is sewage?AIT GAZIABAD

Where does it all go!

Where does the water from the washer go?

When you flush the toilet where does the contents go?By gravity flow, the waste is on its way to your local wastewater treatment plant!

AIT GHAZIABAD

AIT GHAZIABAD

Sewage composition .Solids like vegetable peelings, rice, plastic covers etcOil & Grease from Kitchen / LaundrySuspended solids from kitchenChemicals from detergentsMild colors from laundry / foodPathogenic microbes from fecal matterPhysical impurities, dissolved chemical impurities & Microbiological impuritiesAIT GHAZIABAD

Wastewater Composition

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Why treat wastewater?High concentrations of pollutants from wastewater can have negative effects on fish and wildlife and can result in beach closures and restrictions on shellfish harvesting

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STP Screenings :

Typical Components: TextilesPlasticsPaperRocksWoodOrganicsOther Rubbish

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AIT GHAZIABAD

Hazards of wastewater?34 Lakh children die every year due to water borne diseases. 99% of this are from developing countriesThat is every one child every 21 secondsWater borne diseases originate from human execrate

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Un-treated Sewage is a time bomb that cant be de-fused!!!AIT GHAZIABAD

Why treat wastewater?Causes a demand for dissolved oxygen (lowers DO levels of streams)Adds nutrients (nitrate and phosphate) that cause excessive growthStinks otherwiseIncreases suspended solids or sediments in streams (turbidity increase)To comply with Environmental normsAIT GHAZIABAD

Less than 10% of the sewage only is treatedAIT GHAZIABAD

How is Sewage treated?

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Levels of TreatmentPrimaryremoval by physical separation of grit and large objects (material to landfill for disposal)

Secondaryaerobic microbiological process (sludge)organic matter + O2 CO2 + NH3 + H2ONH3 NO3-

lowers suspended solids content (into sludge)

aquatic nutrient

Mostly dead microbesAIT GHAZIABAD

Aeration and rapid mixingSettlingcollects sludgeon bottom

Secondary process

airdiffuserFrom primary processTo tertiary process

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Levels of Treatment continuedTertiary (advanced)anaerobic microbiological process with a different microbe where O2 is toxic (more sludge)NO3- N2 (escapes to atmosphere)

PO4-3 if not removed in sludge in secondary processPO4-3 + Al+3 AlPO4 (s) (into sludge)

- aeration to strip N2 and re-oxygenate (add DO)AIT GHAZIABAD

Slow mixingto keep suspended and O2 outSettlingcollects sludgeon bottom

Tertiary process

From secondary processEffluent

add methanol as food source

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When the treatment is doneEffluent back to stream afterChlorination / de-chlorination anda final carbon filtrationFor re-use advanced filtration methods Ultra-FiltrationSludge very nutrient richapplied directly to land as fertilizerincinerated (good fuel after drying)composted (good manure)AIT GHAZIABAD

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Treated Sewage is the most reliable source of waterAIT GHAZIABAD

SewageTreatment Plants 56 MLD (Million liters per day)AIT GHAZIABAD

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SEWAGE TREATMENT PLANT GOVINDPURAM (GHAZIABAD)

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