Several key projects discussed and approved by Sheila Dikshit,..
State

DELHI JAL BOARD TRIAL RUN OF PACKAGE-I OF THE INTERCEPTOR SEWER PROJECT COMMENCES

sarkarimirror

Trial Run of Package-1 of the Interceptor Sewer Project commences today

Delhi Jal Board employs state-of-the-art technology, world-class infrastructure to provide the best available water and wastewater services to the citizens of Delhi, and therefore, consistently endeavors to ensure the abatement of pollution in the River Yamuna.

At present, there are more than 1600 unauthorized colonies and 1000 J.J. Clusters. There are no sewerage infrastructures in these habitations and because of various complexities involved, it is not possible to lay the required infrastructure. There are 189 rural villages, which are not yet connected to the sewerage infrastructure. Cumulatively, about 45% of the area of the National Capital with a population of around 40-50 lac, is un-sewered. In some areas, there is generation of both solid and liquid waste. There being, no sewerage infrastructure in these areas, the sewage is being released into the open storm water ditches / drains, which finally finds its way into the river Yamuna.
Laying of sewerage system in the unsewered areas is a mammoth task and requires a large amount of fund and time. Consequently, DJB has undertaken the Interceptor Sewer Project to improve the water quality of the river Yamuna by commissioning of wastewater intercepting sewer in a 59 km. length along the three major drains, viz, Najafgarh, Supplementary and Shahdara. The project is divided into six different packages and involves interception of sewage flowing in around 180 subsidiary small drains and conveying it to the nearest Sewage Treatment Plants (STPs) to ensure that only treated sewage is discharged into major drains. The works that come under these six packages are: Intercepting chambers and trash racks for remaining floating material and silt, Interceptor Sewer, Manholes, SPS and Rising Main. The estimated construction cost of the project is 1962 Crores, this cost includes the O & M cost for the entire project components for a further eleven (11) years inclusive of 1 year of Defect Liability Period.

Under Package-1 of the project, the work of augmentation of the existing capacity of STPs at the mouth of Delhi Gate (constructed as pilot plants under YAP-I), from the existing 2.2 to 17.2 million gallons daily(MGD) has also been undertaken.
As a result of hard work and perseverance, the first mile stone is going to be achieved shortly by taking waste water of Palam Drain in Dwarka into Package-1 of the Interceptor Sewer and diverting it to Pappankalan Sewage Treatment Plant by completing the following works:
Construction of Interceptor Chamber i/c Bar screen and Silt pit at confluence point of Palam Drain & Najafgarh drain.
The Interceptor Sewer from Palam drain to New Pump House near Pappankalan STP.
Rising main from Pump House to Pappankalan STP.

It is envisioned that, the dry weather flow interceptions to be carried with the works, as proposed, will be a key element in the reduction of pollution loading in the main drains and the River Yamuna. Approximately, 60 to 70 percent reduction in Biological Oxygen Demand (BOD) and 70 to 80 percent reduction in TSS, at the outfalls to the River Yamuna from Najafgarh and Supplementary drains and outfall into Noida and Shahdara drains are projected.

Based on the water quality modelling, the project will improve the water quality (in terms of Biological Oxygen Demand (BOD) level) from 41 milli gram per litre (mg/l) to 12 mg/l for the entire river, from 50 mg/l to 14 mg/l for the Najafgarh drain, from 35 mg/l to 11 mg/l for the Supplementary drain and from 32 mg/l to 11 mg/l for the Shahdara drain. The anticipated additional quantity of sewerage, that will flow after treatment, through the drains when the project is completed, is 201 MGD. A length of 59 kms of Interceptor Sewers are proposed to be installed along the banks of the three drains.

To replace the use of ground water with treated effluent for irrigation of the district parks, Delhi Jal Board, advised DDA to use treated effluent which can be spared from the Pappankalan STP. Accordingly, DDA set up their infrastructure to carry treated effluent from Pappankalan STP to the district parks. After commissioning of the Package-1 of the Interceptor Sewer Project at Dwarka, about 5-10 MGD of treated effluent shall also be released to DDA for the irrigation of the district parks in Dwarka. The 129 borewells which were being used by DDA for irrigation purposes, will either be closed or shall now be used for drinking purposes.

The work on the other five packages is preceding at a fast pace and after completion of the Interceptor Sewer Project by the middle of next year, it is expected that approximately 70 percent of the sewage pollution in the river will be taken care of successfully. The combined and committed efforts of all the stakeholders through the implementation of the project and for the years beyond, is critical to allow this project to realize its full potential in achieving a successful abatement of pollution in the River Yamuna