the second — and concluding — part of our trip down the Noyyal (see previous post).
A slum sprawled on one side of the river. In the distance, a factory belched smoke in the air. The riverbed was overrun with weeds and crammed with plastic bags that were half buried into the earth. An earthmover scooped gunk from an open drain and dumped it on top of the debris. The river itself was a thin trickle of black.
The Noyyal is a small river which starts in the western ghats and flows 170 kilometres to merge into the Cauvery. It passes through Tirupur, where factories have been emptying out effluents in its waters ever since a textile hub came up in the 1970s.
After the state failed to protect the river, in 1996, the Supreme Court intervened. It ordered dyeing units in Tirupur to shut down if they could not stop polluting the river. Fifteen years later, in 2011, the Madras High Court followed up by applying the “Polluter Pays” principle, directing the dyeing factories to become zero discharge units by recycling waste water and pumping it back for reuse.
Since then, the larger units in Tirupur have set up their own effluent treatment plants. The smaller ones have come together to set up Common Effluent Treatment Plants. In all, 18 CETPs are operating here.