Tamilnadu Generation & Distribution Corporation proposes a seawater reverse osmosis-based desalination plant in dist. Thoothukudi, Tamil Nadu.


Desalination

Status: Planning Stage

Promoter: Tamilnadu Generation & Distribution Corporation

Project: Proposes a 10 MLD sea water reverse osmosis-based desalination plant

Location: Tuticorin Thermal Power Station, dist. Thoothukudi, Tamil Nadu.

Project Details: According to MoEF sources, the project will be constructed to meet the raw water requirement of its existing 5×210 MW capacity Tuticorin Thermal Power Station. The raw water for the power station is obtained from Thamiraparani river, Coal from Bengal-Bihar coal mines by ship, and the cooling water from the Tuticorin harbour basin. At present the raw water requirement of TTPS is being met out from the water supply by Tamil Nadu Water Supply and Drainage Board (TWAD) through 20 MGD scheme from Tamiraparani river basin. TWAD board has allotted 3.5 MGD i.e., 15.89 MLD of water from their source from Tamirabarani at Manjaneerkayal under 20 MGD scheme to TTPS. Now TTPS utilizes about 1.75 MGD of water for D.M. plant, other service purposes and township usage. An area of 30,400 sq.mtrs. is available in eastern side of cooling water pump house in between cooling water channel for unit 1,2 & 3 and northern compound wall. This area is sufficient for the proposed desalination plant.

It is proposed to draw sea water for this desalination plant from cooling water pump house-I. Water requirement for this desalination plant is about 1,250 cu.mtrs./hr. It is proposed to dispose the brines at outfall arrangements for unit I, II & III. About 90,000 cu.mtrs./hr of sea water is being let-out from unit I, II & III through the outfall structure. The brines disposal from this desalination plant is about 833.33 cu.mtrs./hr. It is proposed to convey the sea water from cooling water pump house-I to this desalination plant by buried pipe line. The brine disposal will also through buried pipe line of size 450mm outer dia HDPE pipe. For conveying raw water produced from this desalination plant to GLRs, it is proposed use 300mm dia MS ERW pipe.

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