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Delhi Jal Board introduces 'Interceptor Sewer'

It's a concept for untreated sewage along the three major drains in the Capital at a cost of Rs 3150 cr, reports Satya Prakash.

india Updated: Nov 21, 2006 23:41 IST

The Delhi Jal Board has proposed a new concept of Interceptor Sewer along the three major drains in the capital at an estimated cost of Rs 3150 crore to check untreated sewage water from flowing into the Yamuna.

Interceptor Sewers would be laid along the Nazafgarh, Supplementary and Shahdara drains over a length of about 115 km in a period of five to seven years, the Delhi Government said in a status report filed in the Supreme Court on the clean up Yamuna plan.

According to the plan, “all the sewage from the un-served areas as well as overflows from the existing systems flowing in the drains will be trapped in the interceptor sewers which will be taken to the existing Sewage Treatment Plants (STPs).”

Presentation regarding the proposed ‘Interceptor Sewer’ has already been given before Delhi Chief Minister Sheila Dikshit, Planning Commission and the Apex Committee constituted by the Supreme Court, the report said.

The apex court is yet to consider the proposal. The court, which had taken suo motu cognizance of a Hindustan Times report in 1994 on the dirt flowing into the Yamuna, was hearing the matter as a PIL since then.

DJB planned to augment the capacity of the existing pilot plants on Delhi Gate and Dr Sen Nursing Home drains to the desired level while the rest 13 drains will be trapped in Ring Road and Bela Road Trunk Sewers which were to be rehabilitated, the DJB said.

Advantages of the solution

Treated effluents from STPs will not need to be treated at mouth of the three major drains, hence the capacity of STPs required will be far less. Further, since the drains would be trapped in Interceptor Sewers, it will take care of all unanswered areas as well as overflows from the existing system and facilitate maintenance and upkeep of major drains, the report said.

The quality of river water will be independent of sewage from unanswered areas and both drains and the Yamuna will benefit from it.

However, the report said that the feasibility survey, detailed survey, detailed project report, estimation and tendering, execution of the project and finally commissioning would take five to seven years.

Meanwhile, the Apex Committee on Yamuna Pollution Clean Up appointed by the court the Centre and the Delhi Government would have spent about Rs 100 crore a km on the Yamun’s 22 km journey theough the capital but it has not resulted in cleaning up of the river.

According to the monitoring done by the Central Pollution Control Board, “there is no Dissolved Oxygen (DO) in the river for most of the year, making it unfit for either human consumption or aquatic life.”

It said the 17 STPs built over the years were not being utilized. Large parts of Delhi remained un-served by sewerage networks.

The city draws clean water from the river at Wazirabad for its use but returns only waste, the Apex Committee said.

Treated effluent from the STPs were discharged into the open drains that lead to the Yamuna and these drains in their journey collect the untreated waste of large parts of the city’s inhabitants.

By mixing treated effluents with untreated sewage, the pollution control efforts were negated, the Committee said.

Meanwhile, the court fixed December five to consider the DJB proposal on the Interceptor Sewer and the Apex Committee Report.

The court had last week expressed serious concern over the rising level of pollution in the Yamuna in the capital and asked the authorities to take appropriate steps on a priority basis to check it.

Delhi Government has already informed the court that it planned to augment the capacity of three existing STPs to check untreated sewage water from flowing into the river.

The capacitiy of Kondli, Okhla and Yamuna Vihar STPs would be increased by 45, 30 and 25 MGD respectively. This would take the total sewage treatment capacity of DJB’s STPs to 612.40 MGD by 2009, it said.

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First Published: Nov 21, 2006 23:41 IST