New Delhi: All operational common effluent treatment plants (CETPs) in the capital do not meet the permissible water quality standards, a report prepared by Delhi Pollution Control Committee has revealed.
The report, which is based on samples collected in December last year, stated that 13 CETPs in the city do not comply with the requisite standards with respect to biochemical oxygen demand, total dissolved solid, sulphide and chloride.
The report was recently submitted to the secretary of the Union ministry of Jal Shakti. DPCC also wrote to “CETPs societies and operators for taking rectification measures to meet the prescribed standards.”
According to the report submitted, a copy of which is with TOI, Nangloi CETP — which caters to Nangloi and Udyog Nagar industrial areas — did not meet the prescribed standard for TDS, sulphide and chloride.
The effluent outlet at Bawana CETP — which has a maximum capacity of treating toxic effluent of 35 MLD for chloride — was more than the double the prescribed standard. Similarly, effluent outlet at Bawana CETP for sulphide was 6mg/l, against the prescribed standard of 2mg/l. This CETP at Bawana failed to meet the requisite standard for TDS too.
An official from the environment department said: “CETPs in Delhi are not complying with the prescribed standard of water quality mainly due to presence of old solid sludge.”
Experts claimed the work of CETPs was to treat toxic industrial effluents before it entered Yamuna, but since all CETPs in Delhi have failed to meet the water quality standard, harmful effluents are passing into the river. “The problem of CETPs not complying to standard would be resolved when all industrial units reuse water discharged by them and the units achieve zero liquid discharge. The focus of DPCC should be on achieving zero liquid discharge,” Manoj Mishra, convenor of Yamuna Jiye Abhiyaan, said.
“Besides, there are many illegal industries located in non-conforming areas, which are not connected to effluent treatment plants and are discharging toxic waste directly into the river through drains,” Mishra added.
Delhi has 13 CETPs for management of industrial effluent generated from 17 approved industrial areas. They have a total treatment capacity of 212.3 million litres per day. A total of 33,690 industrial units are connected to CETPs in 17 approved industrial areas.