The quality of water in the Selaiyur lake has been found unfit for usage since it contains a high level of organic matter due to discharge of raw sewage into the waterbody, results of water sample tests taken by an NGO have revealed.
Surface water in natural environments contains a small quantity of organic compounds. But in an urbanised centre like in Selaiyur, heavy inflow of sewage brings in loads of nutrients to the water bodies which is consumed by the micro organisms present in the water utilises dissolved oxygen in the water, activists pointed. The demand for oxygen increases, leading to mass fish deaths in the waterbody and these lakes will become like Adyar and Cooum. It is a common problem faced in urban areas.
“There was some suggestions to pour some chemicals to purify the lake dirty water. But it is effective and feasible only for small ponds. Not effective or feasible for such a large water body. Moreover, it is not a permanent solution or the best option,” said Saravanan K, another volunteer.
The Water Resources Department (WRD) said that they will soon set up a sewage treatment plant (STP) in the lake. A senior WRD official said, “We are in process in restoring the water bodies in the city. As part of the project, we will be installing STP to stop sewage entering into the lake.”