NEW DELHI: The Palam drain, which contributed to the city's most polluted channel, the Najafgarh drain, is set to get a facelift. Conservation body INTACH will help Delhi Development Authority implement a cleaning programme that will use four bio-remediation techniques to improve water quality in the drain.
These include use of bacteria, sedimentation, fish and water plants. Bacteria treatment has already started and has reduced biochemical oxygen demand, an indicator of pollution, from over 100 mg/lt to less than 30 mg/lt. In 2007, DDA covered a 2.3 km stretch of the drain and converted it into a road.
That only aggravated the problem of odor as aeration was not possible. The over 6-km long drain originates in Delhi Cantt and is fed by untreated waste from several unauthorized settlements in and around Dwarka before it joins the Najafgarh drain. The principal advisor of environmental projects in the natural heritage division of INTACH, Manu Bhatnagar, said that bacteria dosing was started 3-km upstream of the drain at three points on June 13. Within a week, residents said that foul odor emanating from the drain had reduced drastically. "We have selected natural bacteria that breed in waste waste. The best strains have been selected and are being introduced in large numbers into the drain.
These are anaerobic and work by breaking down compounds. Once the drain emerges from the covered zone, the hyacinth section will begin. This helps in removal of heavy metal traces from the sewage. A sedimentation tank also needs to be created at this point as part of the treatment process," said Bhatnagar. Once the sewage has cleared these processes, it will be exposed to large quantities of daphnia. These are small , between 0.2 and 5 mm in length and help by eating microscopic plants and organisms. Eventually, they will become part of the foodchain as they will become food for bigger organisms. The daphnia will be cultivated along the banks of the drain.
The last section of the process will include the fish zone in which carps will be released into the water. A restraint net will be put up at the point where the Palam drain empties into the Najafgarh drain to prevent the fish from entering the bigger channel.
"Civil work will start by October 1. Once the process is fully implemented, it will take barely a few months for the water quality to improve drastically. The capital cost for the project is around Rs 12 crore while operation and maintenance will be around Rs 3 crore per year. The project will be implemented by DDA while INTACH will monitor and advise on the project," said sources.
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