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Low Temperature Thermal Desalination (LTTD) technology

  • Category
    Science & Technology
  • Published
    24th Mar, 2023

Context

For supplying portable drinking water, Lakshadweep using Low Temperature Thermal Desalination (LTTD) technology which the National Institute of Ocean Technology (NIOT) is working at making this process free of emissions.

About the technology:

  • The plants are equipped to provide at least 100,000 litres of potable water every day.
  • The desalination plants are powered by diesel generator sets — there being no other source of power in the islands.
  • LTTD exploits the difference in temperature (nearly 15°C) in ocean water at the surface and at depths of about 600 feet.
  • Such de-pressurised water can evaporate even at ambient temperatures and this resulting vapour when condensed is free of salts and contaminants and fit to consume.

Currently there were five desalination plants in operation in the Lakshadweep islands.

Issues/concerns:

  • The need for diesel power to reduce the water pressure means that the process is not fossil-fuel free and also consumes diesel.

National Institute of Ocean Technology (NIOT):

  • NIOT, an institute under the aegis of the Ministry of Earth Sciences (MoES), has worked for years on harnessing energy from the ocean.
  • It is a Chennai-based plant.
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