New Delhi, Jan. 13 -- The latest Delhi Pollution Control Committee (DPCC) report shows that, of Delhi's 37 sewage treatment plants (STPs), 12 did not meet the treatment standards prescribed by the Central Pollution Control Board (CPCB) in November while sample could not be lifted from the 13th facility at Sonia Vihar, even as the clean-up of Yamuna is under the spotlight. The report, dated December 17, is part of the monthly assessment report for November, and it reveals that a large section of the STPs do not meet the prescribed norms set for parameters such as faecal coliform, biological oxygen demand (BOD), Chemical Oxygen Demand (COD) and total suspended solids (TSS), among others. DPCC collects and analyses samples for STPs once every month. The faecal coliform level was 234 times the prescribed limit at Molarband STP, 73 times more than the limits at Ghitorni treatment plant, 70 times at Vasant Kunj(2) STP, while other plants also failed to meet other parameters. Importantly, the number of STPs found to be failing on treatment norms has increased with nine such plants earmarked by the DPCC in September and October reports. DPCC report said that the 12 STPs which failed to meet the standards include Sen Nursing home STP, Delhi gate, Kapashera, Molar Band, Okhla (old), Mehrauli, Vasant Kunj 1 and 2, Ghitorni, Yamuna Vihar phase 1 and phase 3 and Nilothi New (Phase-1). While most STPs failed to meet the faecal coliform treatment levels, the ones at Mehrauli, Vasant Kunj, Yamuna Vihar and Mehrauli failed on three or more parameters. Meawhile, no sample could be taken from the Sonia Vihar STP as there was no flow during the inspection. Against the prescribed limit of 230 MPN/100ml, the faecal coliform level at outlet of Molarband was found to be 54,000 units; 3,500 units at Mehrauli and 16,000 units at Vasant Kunj-2, and 9,200 units at Vasant Kunj-1. The TSS and BOD levels should be less than 10mg/L, according to the CPCB parameters, but six STPs failed to meet these standards. STPs are the primary tools its attempt to clean Yamuna in the city which has an estimated sewage generation of 3,600 MLD (million litre per day) or 792 MGD (million gallons per day). Delhi estimates that the 80% of its water supply (990 MGD) comes back as wastewater. Delhi has 37 STPs at 20 locations which have an installed capacity to treat only 667 MGD water....