Many industrial estates in the city are setting up sewage and effluent treatment plants in an effort to promote eco-friendly practices and reduce burden on civic agencies. The industrial estate in Ambattur is the forerunner among the estates with two sewage treatment plants set up in north and south phase. The projects were implemented by the Chennai Auto Ancillary Industrial Infrastructure Upgradation Company (CAAIIUC), a special purpose vehicle promoted by the Central and State governments and stakeholders to improve infrastructure at the estates in Thirumudivakkam, Thirumazhisai and Ambattur.
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