CHENNAI: By January next year, Metrowater will treat another 10 million litres of grey water a day before releasing into water bodies. Work to set up two treatment plants — at Nesapakkam and Perungudi — is nearing completion.
A senior Metrowater official said 76% of work on the Nesappakkam treatment plant is over and in the Perungudi plant, 66% of the work has been completed. While Nesappakkam plant will become operational by January, the one in Perungudi will be ready by March 2022, the official said. Tertiary treated ultra-filtration technology will be used.
Each of the plants have the capacity to treat 10 million litres water a day.
Metrowater is treating 90MLD of grey water in two existing plants at Kodungaiyur and Koyambedu (each 45MLD capacity). Both the plants adopt reverse osmosis technology and the treated water from these two plants are potable, said the official.
At present, 540MLD of grey water is generated in the city daily. With the new plants, the treating capacity would climb up to 110MLD. The official further added that the new plants can be expanded to treat more water.
Treating grey or used water, which is 99% water and 1% waste, and releasing them into water bodies recharges the groundwater table and establishes circular water usage. Treated water from the Perungudi plant will be released into the Pallikaranai marshland and water from Nesappakkam plant will be released into Porur lake.
The treated water from Kodungaiyur plant is being sold to industrial units in Ennore and Manali and that from Koyambedu plant is being sold to industrial units in Irugattukottai.
