India, Oct. 19 -- The Delhi Jal Board (DJB) will rope in private firms to purchase raw biogas generated during sewage treatment, as the water utility looks to commercially utilise gas produced from sludge digestion rather than allowing it to be flared or left underutilised, senior DJB officials said.

To begin with, the DJB will initiate this process at two of its 37 sewage treatment plants for which expressions of interest have been invited.

The project covers the Keshopur Phase-I sewage treatment plant (STP), which is being upgraded from 12 million gallons per day (MGD) to 18 MGD, and the Yamuna Vihar Phase-II STP, which has a capacity of 15 MGD (68 million litres per day). The agencies are likely to be hired by November, an official s...