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SEWAGE TREATMENT – TECHNOLOGIES

SEWAGE TREATMENT TECHNOLOGIESTECHNOLOGIEST ypes of contaminants in SewageTypes of contaminants in SewageORGANICINORGANIC Sugar MilkSuspendedDissolvedSuspendedDissolved Vegetable matter Food residue Plastic bags Cans Fiber clothes SaltBiological treatmentPrimary treatmentSl. NoContaminantSourceEnvironmental significance1 Suspended solidsDomestic use, industrial wastesCause sludge deposits and anaerobic condition in aquatic environmentImportant Waste Water Contaminantsin aquatic environment2 Biodegradable organicDomestic use , industrial wastesCause biological degradation3 PathogensDomestic waterTransmit communicable disease4nutrientsDomestic and industrial wasteCause eutrophication5 Refractory organicsIndustrial wasteCause taste and odour problemsPollutants in SEWAGE BOD(Bio Chemical Oxygen demand) COD(Chemical Oxygen demand) COD(Chemical Oxygen demand) TSS(Total Suspended Solids)

Sludge Handling – Centrifuge Objective : Dewatering of sludge @ 95% of the BOD removed in Kg. Important Features - Advanced method of solid-liquid separation - Less area - Power required for pumping the sludge and operation of centrifuge - Less time - Efficient dewatering Design criteria - Inlet sludge solid consistency : min 0.8 to1%

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