Delhi water supply: Delhi: Project to get treated waste water in taps back in pipeline | Delhi News – Times of India


NEW DELHI: The project to reuse highly treated waste water to augment Delhi’s water supply is back on track as the Upper Yamuna River Board (UYRB) cleared it after discussing it for over two years.

A Delhi Jal Board official said that the board has given the first-ever project-of-its-kind in India in-principle approval. “It took us a lot of efforts to convince UYRB about the significance of the project. Haryana still has objections, but it is our internal project and that state has no relevance because DJB will release treated water and relift it within Delhi’s own jurisdiction,” the official said.
In July 2018, chief minister Arvind Kejriwal, who was then the DJB chairman, had announced that with Singapore’s NEWater as the model, treated sewage water from the Coronation Pillar Water Treatment Plant would be taken to Palla and dumped into the Yamuna. The diluted water would be then be lifted again 11km downstream in Wazirabad and re-used to augment the tap water supply. Haryana had objected to the use of treated water for consumption on grounds of social acceptability.
While giving the green signal, UYRB has made the norms for treated water more stringent. During last month’s meeting of the board, it said: “Instead of biological oxygen demand to total suspended solids ratio of 10:10, the treated water from Coronation Pillar plant will be further purified with the use of advanced technology of microfiltration to 3:3 levels, which is Class C level for clean inland surface water level.”
UYRB has also mandated that DJB can re-lift only 80% of the treated waste water released into river Yamuna at Palla, the remaining 20% should left in the river, both upstream and downstream of Wazirabad, for ecological purposes.
To placate Haryana’s concerns about the project affecting water sharing between the states, DJB plans to install flow meters at Palla, and the intake point and each and every drop will be accounted for.
Upper Yamuna River Board is the statutory body to resolve disputes between the basin states of Yamuna and regulates the allocation of available water flow among the beneficiary states.
In announcing the use of treated waste water in 2018, Kejriwal had said that 15-20% of overall supply would be augmented in two years, before expanding to 50% over the following five years by upgradation of other water treatment plants.
DJB is building Asia’s largest sewage treatment plant at Coronation Park to produce high quality treated water with BOD and TSS levels of 10 and 10. “The national norm for treated effluent dumped in rivers is 20:20. We will now further improve the water quality 3:3 level,” the DJB official claimed
The augmentation timeline has to be reworked, however. The plan in 2018 was for DJB to add 70MGD from Coronation Park in the first phase to the available total water supply capacity of 930 million gallons per day. And then 40MGD from Rithala by December 2019 and another 40MGD by June 2020. “It may now take up to two years to set up the pumping infrastructure and pipelines to take water upstream to Palla,” admitted the official.

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