24 pol­luted lakes in Thane to be treated of odour, al­gae

Hindustan Times ST (Mumbai) - HT Navi Mumbai Live - - NAVI - Megha Pol megha.pol@hin­dus­tan­times.com

The lakes in the city may soon be free of pol­lu­tion and odour.

The Thane Mu­nic­i­pal Cor­po­ra­tion (TMC) has de­cided to carry out pro­bi­otic treat­ment on the lakes. The treat­ment was ear­lier used on Makhamali lake on a pi­lot ba­sis. Af­ter its suc­cess, 24 lakes in Thane will now be con­served by us­ing pro­bi­otic prod­ucts.

With more than 36 lakes, Thane is known as the city of lakes. But with most lakes pol­luted, the city is strug­gling to keep the wa­ter bod­ies alive.

As per the en­vi­ron­ment re­port of TMC, the bi­o­log­i­cal oxy­gen de­mand (BOD), harm­ful for the bio­di­ver­sity of the wa­ter bod­ies, lev­els are not only in­creas­ing, but the level of dis­solved oxy­gen has also de­creased in these wa­ter bod­ies.

The mu­nic­i­pal cor­po­ra­tion ear­lier used biore­me­di­a­tion which makes use of aer­a­tion to main­tain the level of oxy­gen in the lakes. How­ever, pro­bi­otic treat­ment will not only in­crease the oxy­gen level but also deal with other pol­lu­tion is­sues.

An of­fi­cial from the pol­lu­tion depart­ment said, “In pro­bi­otic treat­ment, we will use bio-prod­ucts to re­duce the hard­ness of wa­ter, con­trol the growth of al­gae and re­duce the foul odour. We will con­duct this treat­ment on 24 lakes across the city.”

The pro­bi­otic treat­ment in­cludes the use of bac­te­rial prod­ucts such as aquatic waste de­graders, prod­ucts for re­moval of ammonia and ni­trate, prod­ucts which re­move the sludge and odour from the wa­ter bod­ies. The aim of us­ing the prod­uct is to en­sure that the nat­u­ral sys­tem re­gains its ca­pac­ity of self­pu­rifi­ca­tion. The prod­ucts used will be bi­o­log­i­cally safe and not harm the marine life.

“In bio re­me­di­a­tion, we needed aer­a­tion to main­tain the level of oxy­gen in the wa­ter. There was no scope to re­duce the hard­ness and den­sity of wa­ter,” the of­fi­cial added.

The bio-prod­ucts will be added every three months to the lakes. The cost of the process will be one lakh per lake for one year. The cor­po­ra­tion will thus spend around Rs24 lakh for treat­ing the lakes with pro­bi­otic prod­ucts.

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