21-10-2014, 03:01 PM
Abstracts: Sewage treatment is the process of removing contaminants from wastewater and household sewage, both runoffs (effluents), domestic, commercial and institutional. It includes physical, chemical, and biological processes to remove physical, chemical and biological contaminants. Its objective is to produce an environmentally safe fluid waste stream (or treated effluent) and a solid waste (or treated sludge) suitable for disposal or reuse (usually as farm fertilizer). The sewage treatment plant in BSF CAMP, GANDHINAGAR uses preliminary,primary, secondary and tertiary treatment units for treating predominantly domestic sewage. The raw sewage is characterized by high dissolved solids, medium strength BOD, and high concentration of chloride, sulphate and sulfide due to septic sewage. The treated effluent is used in golf course, green way or park and remaining is disposed in the Sabarmati River. The stabilized sludge is used as a soil conditioner. Microorganisms are present in large numbers in sewage treatment plant effluents and waterborne disease outbreaks have been associated with sewage-contaminated water supplies or recreational waters. The main problem occurring in STP, BSF is the lack of disinfectant and Effluent parameter like TSS which exceed the limits given in the effluent standard of GPCB. There is a leakage also from collection tank and the untreated leaked raw sewage is directly flushed into Sabarmati River. This has to be investigated and rectified. Moreover, Gas generated in sludge digester, which contains methane is not utilized for any purpose.