Assessment of secondary treated water quality through water quality index

The solution to all water challenges like water scarcity, unaccounted water loss or safe disposal of wastewater lies in wastewater treatment and reuse of treated water. To meet the sustainable water management practices, sewage treatment plants (STPs) are being installed for domestic wastewater treatment in new developing residential colonies. This research paper evaluates the water quality of sewage treatment plant operating on extended aeration process with average inflow of 400 KLD functioning in a residential colony, Ridhi Sidhi Enclave, Sri Ganganagar. This assessment will help to decide if the emanating is under cut-off points given by CPCB. The results indicated that average value of COD (144±14.77), TA (194.8±26.21) and TDS (532.7±38.20) are higher than permissible limits of FAO or BIS limits of drinking water but within limits of EPA standards of inland surface water. Average BOD values (51.7mg/l±6.7) are higher than permissible limits of FAO and inland surface waters standards (30mg/l). Regarding overall water quality, present study indicated that STP undertaken for study is capable of producing good to moderately good quality effluent at different times of sampling with respect to physicochemical parameters and there is a need of continuous monitoring of treated water quality.