A study of effectiveness of treatment technology of wastewater treatment plants in Delhi and NCR regions
Harshita Jain and Renu Dhupper
This is a study to assess the efficiency of treatment technologies of Wastewater Treatment Plants. The performance of four plants at Haryana and Delhi working on different technologies were evaluated. Wastewater samples were analyzed for various parameters like pH, Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), Total Ammoniacal 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. Performance efficiency of technologies such as Up flow anaerobic sludge blanket technology (UASB) with pretreatment by Extended Aeration (EA) and Oxidation pond (OP), Activated Sludge process (ASP) and BIOFOR were studied and compared. Study of performance evaluation of UASB+EA, UASB+OP, ASP and BIOFOR 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 plants was at par as the treated effluent was in permissible limits set by the Ministry of Environment, Forest and Climate Change (MOEF). 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 waste water effectively.