December 2, 2021, India.com
New Delhi: Delhi Jal Board (DJB) will upgrade 20 sewage treatment plants (STPs) and sludge biogas plants in order to clean the environment and produce biogas as much as possible so that they can be used to make clean fuels like bio-CNG and produce electricity.Also Read - Air Pollution Latest Update: Air Quality Panel Orders Immediate Closure of Industries in NCR For Not Using Cleaner Fuels
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