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Progress of Conversion of Seawater Into Potable Water in India


 Low Temperature Thermal Desalination (LTTD) technology for conversion of seawater into potable water is successfully commissioned in the country at 4 places and 6 other are in the pipeline. Kavaratti, Minicoy, Agatti, Lakshadweep and at Northern Chennai Thermal Power Station (NCTPS), Chennai are benefitted with this technology. The capacity of each of these LTTD plants is 1 lakh litre per day of potable water. The water is used locally.Besides, the Ministry is working to set up 6 more plants funded by Lakshadweep Administration, one each in the islands of Lakshadweep viz., Amini, Chetlet, Dadamath, Kalpeni, Kiltan and Andrott plants.

The Ministry of Earth Science (MoEF) had launched a program for development of low Temperature Thermal Desalination (LTTD) technology for conversion of seawater into potable water, suitable for installation in the island territories and near the coastal Power Plants. The National Institute of Ocean Technology (NIOT), an autonomous body of the Ministry of Earth Sciences, has been responsible for design, develop, demonstrate and commission the LTTD plants in selected coastal locations. The LTTD is a process under which the warm surface sea water is flash evaporated at low pressure and the vapour is condensed with cold deep sea water. The technology is indigenous, robust and environment friendly.

The cost per litre of desalination would depend on the technology used and cost of electricity which varies from place to place. According to the cost estimates made recently by an independent agency for LTTD technology, the operational costs per litre of desalinate water currently works to be 19 paise. Efforts are being made to reduce operational cost by adopting optimum design parameters.

The quantum of fresh water, equivalent to bottled quality, produced in last 3 years is 1150 lakh litress in the Lakshadweep islands.

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