Excessive growth of weeds, which reduces the oxygen level in water, is one the reasons behind the pollution in most lakes in Thane, according to the research carried out by the Indian Institute of Technology, Bombay, in collaboration with the Thane Municipal Corporation (TMC).
The research paper on conservation of lakes, which will be completed by March 2015, will be published in international journals.
Taking note of the increasing pollution in the 36 lakes in Thane, the TMC filed a memorandum of understanding (MoU) with IIT-B in March 2012, to conduct a research on how the problem can be solved.
“The TMC had data on the pollution level in its lakes for the past 10 years, but it was not classified. We began the research by classifying the data and recording the changes over the past three years. The level of nutrients in the lakes is high because of the rapid growth of weeds. The corporation carries out regular bio- remediation, but it is not helping check the growth,” said Shubhankar Karmakar, associate professor of Centre for Environment Science and Engineering, IIT-B.
The weeds reduce the oxygen content of the water, Karmakar said.
“The lakes in Thane are urban lakes, which are surrounded by slums and residential areas. The dumping of garbage and sewage facilitates the growth of weeds. The data will help the corporation prioritise conservation activities. Moreover, they can also use it in their annual pollution report,” Karmarkar said.
The corporation will float a tender in the standing committee meeting to be held next week to clear the funds required to publish the data.
Manisha Pradhan, pollution control officer, TMC, said, “The research will provide clarity on which lakes need immediate attention. Publishing it
on an international level will help us get perspective on lake conservation from global experts."