Published On:April 15 2019
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L&T to install bio sewage treatment plant at MTHL.

Larsen & Toubro (L&T) has installed 36 Bio Digester Tanks underground at the site of the upcoming Mumbai Trans Harbour Link Road (MTHL) in Sewri as part of their solid waste management measure for the project. The tanks have a capacity of 400 liters and have been designed to last around four and half years to over 4,500 workforce that will work on the project at its peak.

The plan to install the tanks emerged as the location of the construction did not allow traditional waste management solutions such as soak pits or a sewage treatment plant. “Firstly, the area did not come under the purview of the Municipal Commission of Greater Mumbai; then there were no existing sewage network drains in the vicinity and the groundwater table is too shallow to construct a soak pit. We evaluated several other options too including a conventional sewage treatment plant,” an L&T spokesperson, said.

The technology used in the tanks has been patented by the Defence Research and Development Organisation (DRDO) and relies on microbes instead of chemicals for the treatment. Other benefits include no sludge generation and the treated water meets the standards set by Maharashtra Pollution Control Board.

The bio tanks can be emptied and reinstalled at any other location where temporary sewage treatment is required. L&T Construction is planning similar systems at its other projects in the city such as the Coastal Road and the Shivaji Statue.


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