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Capital's sewerage system to be overhauled

Staff Reporter

To ensure untreated waste does not flow into the Yamuna

NEW DELHI: The Delhi Jal Board has decided to overhaul the city's sewerage system to ensure that untreated wastewater does not make its way into the Yamuna.

DJB Chief Executive Officer Arun Mathur on Wednesday said that to counter the problem of effluents polluting the river waters the Board had put forth suggestions that had been "widely accepted and a detailed project report on the concept is being finalised".

To prevent spillage of untreated waste from 17 drains in the city into the 22 km stretch of the Yamuna between Wazirabad Barrage and Okhla Barrage, the DJB has suggested setting up of a system that will intercept sewage on the three major drains of Delhi, Najafgarh, Shahdara and supplementary drains.

Pointing out that these drains collectively carry about 75 per cent of the city's sewage, he said the Board had proposed setting up intercepting Sewage Treatment Plants at these drains. "The sewage flowing into small drains would be intercepted before it enters the bigger drain and conveyed to the nearest STP through the proposed interceptor sewers along the three major drains."

This apart, all the remaining drains will be trapped in the Bela Road and Ring Road sewer once they are rehabilitated under the Yamuna Action Plan-II (YAP-II). "The deadline for carrying out the work is December 2008," Mr. Mathur said.

The Board has also suggested augmenting the capacity of the existing STPs at Delhi Gate and Dr. Sen Nursing Home nullah emptying into the Yamuna at ITO. Their capacity will be increased from 2 MGD to 10 MDG. "The treatment capacity of existing STPs will be augmented once the present capacity is fully utilised. We are also trying to increase the capacity of the STPs at Okhla, Kondli and Yamuna Vihar," Mr. Mathur said. Mr. Mathur said: "The advantage of this solution will be that the treated effluent of the plants will not be re-treated and since drains are being trapped in interceptor sewers it will take care of all un-sewered areas as well as overflows from the existing system."

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