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DELHI JAL BOARD CONDUCTS WORKSHOP ON USING TREATED EFFLUENT FOR NON-POTABLE USES

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DJB conducts workshop on using Treated Effluent for non-potable uses
DMRC, PWD, CPWD, PPCL, NTPC, Municipal Bodies and the Railways participate

Delhi Jal Board organised a workshop to promote the use of Treated Effluent at DJB Headquarter, on 20.08.2014. The workshop was aimed to encourage the use of treated effluent for all non-potable purposes by the above departments. The Delhi Jal Board is actively promoting the use of treated effluent produced by DJB at its Waste Water Treatment Plants (WWTPs), for non-potable purposes such as Irrigation, Horticulture, Cooling Plants, for washing purposes in the Railways and Transport, Industrial use, Construction industries, Groundwater recharge, Water bodies, as a raw water source, and also for flushing of toilets.
Presently 142 Million Gallons Daily (MGD) of Treated Effluent is used for different purposes by different government bodies and there is a further potential of using about 200 MGD of treated effluent in Parks, Water Bodies, Ridges and as a coolant in the power plants.

In the workshop, various steps already initiated by DJB by means of which treated effluent is being used were also discussed. In an effort to meet a part of non-drinking water demand with treated effluent, DJB has set up a one MGD capacity WWTP based on the MBR technology for using treated effluent for flushing through dual pipe in the Common Wealth Games Village. As a pilot project, a 10 MLD tertiary treatment plant at Okhla is being set up and the treated effluent from the plant will be used for construction purposes in the Okhla Industrial Areas and bus washing at DTC depots. A PPP project at the Coronation Plant of 40 MGD is proposed to be set up and the tertiary level treated effluent from the plant will be discharged into the River Yamuna at Palla, to be mixed with raw water and reused as a source of raw water for treatment at Wazirabad. All the new Wastewater Treatment Plants are being set up based on the latest technology to enable high standard quality treatment upto Biological Oxygen Demand (BOD) <10 and Suspended Solid < 10.

DJB used the workshop as a platform to present a global picture on the usage of treated effluent across the world. Case studies were discussed from Tokyo (Japan), Los Angeles (California, USA), Brisbane (Australia) and Singapore: NEWater. It was pointed out that in Tokyo, the polluted Meguro River was revived using highly treated effluent. In Brisbane (Australia), treated effluent is discharged in a lake to recharge ground water and it is also used for drinking purposes.

Various government corporations and entities such as the Delhi Metro Rail Corporation (DMRC), the Public Works Department (PWD), Central Public Works Department (CPWD), Pragati Power Corporation Limited (PPCL) and National Thermal Power Corporation (NTPC), Municipal Bodies (NDMC, SDMC, EDMC) and the Railways participated in the workshop. Emphasis was laid on the fact that the water demands by these government agencies put immense pressure on the existing limited water resources, which can be considerably reduced by the potential use of treated effluent.

The current demand of the city is 1080 Million Gallons per Day (MGD) and DJB, with the limited available water resources, supplies 840-850 of filter water. With the use of treated effluent, it is expected that DJB will be able to meet the demand and supply gap of 240 MGD.

CEO, DJB requested the representatives of all the departments present at the workshop to submit their proposal of using treated effluent for non-potable purposes within one month. Since groundwater is depleting rapidly, use of groundwater for non-potable purposes cannot be allowed in any case. It was also made clear that if the proposal of replacing ground water/filter water with treated effluent is not received within one month, DJB will start taking legal action on banning further use of ground water as per the act.