PERFORMANCE ANALYSIS OF EXISTING SEWAGE TREATMENT PLANTS IN PRAYAGRAJ, UTTAR PRADESHAjit Kumar Vidyarthi and Raj Kishore Singh
This study is based on the performance assessment of seven existing sewage treatment plants (STPs) in Prayagraj, Uttar Pradesh. These STPs are based on different treatment technology comprising primary and secondary treatment system. Effective treatment of sewage is very crucial, as it is one of the most importantfactors for environmental degradation as it contains variety of organic and inorganic constituents, which degrade the environment. Three parameters namely Total Suspended Solids (TSS), Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) were considered for the study. The study shows that the treatment efficiency of one of the STP is not up to the level and needs urgent attention to meet the notified discharge standards. In all the STPs the average reduction in TSS, BOD and COD is in the range of expected removal of 70-80% except Salori STP of 29 MLD in which the average reduction is 69.88, 39.69 and40.36 % respectively, which is much below the expected removal of 70-80% indicating poor efficiency interms of TSS, BOD and COD.