ABSTRACT
This is a study to assess the efficiency of sewage treatment plants (STP) on the basis of different technologies. The performance of four STP’s at Delhi and Noida working on different technology was evaluated. Sewage water samples were analyzed for various parameters like pH, biochemical oxygen demand (BOD), chemical oxygen demand (COD), total suspended solids (TSS), total nitrogen (TN), total phosphorus (TP), total coliforms (TC) and fecal coliforms (FC). The samples were collected from the inlet unit and outlet unit and then compared. Study of performance evaluation of STPs based on SBR, iSBR, BIOFAR, and ASP technologies shows that the BOD removal efficiencies were 97.72%, 94.21%, 94.49%, and 96.55% while the COD removal efficiencies were 89.85%, 94.53%, 86.9%, and 97.09%. The results were not significantly varying, and the performance of all the STP’s was at par as the treated effluent was in permissible limits set by the Ministry of Environment, Forest, and Climate Change (MoEFCC). Based on the experience of this study, the performance also depends on three major factors which are regular maintenance, skilled manpower, and uninterrupted power supply. All the technologies are efficient in reducing the organic load, nutrients, and pathogens from the wastewater effectively.344
