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English News

Pilot project for sewer solution & sanitation improvement plan for Aya Nagar, Delhi

July 17, 2015 11:26 PM

Taking forward the vision of the Delhi government of finding the right mix of centralized and decentralized model of sewer and water treatment the government had given the go-ahead to a proposal moved by Delhi Dialogue Commission (DDC) to use bio-digester technology for sewer solution in Aya Nagar of Chhatarpur assembly constituency. The project was given a go-ahead by the chief minister Mr. Arvind Kejriwal in a meeting with the DDC on July 16, 2015. Vice-Chairman of DDC Mr. Ashish Khetan on July 17, 2015, unveiled the Sanitation improvement plan for Aya Nagar as a pilot project in a press conference. Mr. Khetan, along with the Member Secretary of DDC Dr. N. Vasantha Kumar made a presentation on how the pilot project would be rolled out and help in making the surrounding hygienic and clean in Aya Nagar. The results of the pilot project would be analysed to take a considered decision of scaling up the project in other localities.

 “Delhi lack efficient sanitation management systems and 50% population of this state has no access to sewer systems. More than 2200 colonies have no sewer connection and 1600 colonies have partial sewer system,” said Mr. Khetan during the presentation.  

It was also added that the improper construction and management of septic tanks further mars the situation. In addition to this, there is also unhygienic emptying, treatment and transportation of faecal sludge and poor drainage system.

The statement during the press conference said that, the solution lies in converting individual household tanks into bio-digesters with people’s participation. Also covered drainage system needs to be provided for conveyance of bio-digester. There would be a provision of street end digester to treat brown water. There will also be a provision of decentralized faecal sludge for effluent treatment, and this would be done with the help of a robust review and monitoring system. 
The pilot area for this project will be Aya Nagar which is a village cum unauthorized colony in South west Delhi. Each house there has a septic tank where the bio-digester would be installed and a WLC pump to pump out extra water and treated sewage into the outside drains would be provided. "Drainage & street end sump & pump system" would be provided which will further treat the combined treat black water and untreated grey water to a higher level.

The entire process would be anaerobic in nature, hence devoid of any foul smell and disease causing pathogens.

 At Aya Nagar

  • Block A phase 1
  • Block A phase 5
  • Block Z phase 5


Bio digester installation is 50% cheaper than septic tank and gives out natural methane and CO2 (minimal air and water pollution) and requires 25-30% space compared to septic tanks.


Financial Implication: Rs.50k to 2lakhs per household unit based on the requirements


Street end digester costs Rs.6 lakhs per15KL unit


Anaerobic Advatange:


  • No aeration is required
  • >99% pathogens inactivation
  • Can degrade detergents/phenyl
  • Sludge generation is very less
  • One time bacterial inoculation is enough
  • Minimal maintenance & no recurring cost


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