At least seven STPs fail prescribed discharge standards: DPCC report
At least seven sewage treatment plants (STPs) have failed the prescribed discharge standards for total suspended solids, biochemical oxygen demand and faecal coliform levels in April, the latest Delhi Pollution Control Committee (DPCC) report said.
Testing standards across more than 30 STPs in the national capital, the report provides data for samples collected from both inlet and outlet points. The Ghitorni, Vasant Kunj-I, and Delhi Gate (Old) STPs fared the worst, failing on all four parameters: faecal coliform, BOD, chemical oxygen demand (COD), and total suspended solids (TSS). Vasant Kunj-II, Yamuna Vihar Ph-I, Yamuna Vihar Ph-III, and Mehrauli STPs failed on three parameters – TSS, BOD and faecal coliform.
Flagging the Delhi Gate (Old) STP for non-compliance, the report said the outlet sample from the facility exceeded the set limits for total suspended solids, biological oxygen demand and faecal coliform.
According to the report, the treated discharge from the Delhi Gate plant recorded TSS at 18 mg/l against the prescribed limit of 10 mg/l and BOD at 12 mg/l against the permissible level of 10 mg/l.
The faecal coliform count at the facility was 1,500 MPN/100 ml, significantly above the prescribed standard of 230 MPN/100 ml, it added. Meanwhile, the sample collected from the STP at Yamuna Vihar Ph-III showed a faecal coliform level of 8,400 MPN/100 ml, along with high TSS, BOD, ammoniacal nitrogen and dissolved phosphate.
The other STPs that have not met the prescribed limits included those at Yamuna Vihar Ph-I, Mehrauli, Ghitorni and two in Vasant Kunj.
