Under the Namami Gange project of the Centre, a host of measures for sanitation as well as checking the flow of sewer drains into the Ganga river were put in place at an expenditure of around Rs 250 crore, said officials of the National Clean Ganga Mission (NCGM).
"There are 46 big drains that flow directly in the river. Their flow has been checked and treated through bioremediation and polymer-based techniques to provide clean water for the Kumbh," said Rajat Gupta, special consultant with the NCGM.
Under the project, the UP Jal Nigam hired an NGO, Geo Contractors, for treating sewer water of Arail, Salori, Mawaiya, Lote Haran and Rajapur drains of total 60.51 MLD discharge through advanced techniques.
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A special technique - geosynthetic dewatering tube - was being used to clean water of Lote Haran drain on the Jhusi side of the Ganga river.