National Institute of Ocean Technology to set up green, self-powered desalination plant in Lakshadweep

Subject : Geography

Section: Physical Geography

Context: NIOT is providing potable water in six islands of Lakshadweep using Low Temperature Thermal Desalination technology.

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Stepping up from its ongoing initiative of providing potable water in six islands of Lakshadweep using Low Temperature Thermal Desalination (LTTD) technology, the Chennai-based National Institute of Ocean Technology (NIOT) is working at making this process free of emissions.
Currently the desalination plants, each of which provides at least 100,000 litres of potable water every-day, are powered by diesel generator sets — there being no other source of power in the islands.
However, the need for diesel power to reduce the water pressure means that the process is not fossil-fuel free and also consumes diesel, a precious commodity in the islands that has to be shipped from the mainland critical for powering the electric grid.

Low Temperature Thermal Desalination (LTTD) technology

Low Temperature Thermal Desalination (LTTD) is a technology used for desalination of seawater, developed by the National Institute of Ocean Technology (NIOT), India.
LTTD is a process that uses the difference in temperature between surface seawater and deep seawater to produce fresh water.
Working principle: LTTD works on the principle of thermodynamic heat exchange, where the heat from warm surface water is used to evaporate a low-boiling-point fluid, such as ammonia, which is then condensed using the cold deep seawater.
Efficiency: LTTD technology has an efficiency of up to 35%, which means that it can produce one cubic meter of fresh water using only 2-3 kWh of energy.
Applications: LTTD technology has applications in areas where there is a shortage of fresh water, such as islands, coastal regions, and arid regions.
Advantages: LTTD technology has several advantages over other desalination methods, including low energy consumption, low operating cost, and minimal environmental impact.
Challenges: One of the main challenges of LTTD technology is the maintenance of the heat exchanger, which requires special materials and techniques to withstand the corrosive nature of seawater.
Future prospects: LTTD technology has the potential to be a sustainable and cost-effective solution for desalination, and can play a crucial role in addressing the global water crisis.

National Institute of Ocean Technology

The National Institute of Ocean Technology (NIOT) is an autonomous organization under the Ministry of Earth Sciences, Government of India.
NIOT was established in 1993 with the aim of developing technology related to ocean exploration and ocean resource utilization.
The main objectives of NIOT include developing technology for offshore exploration and exploitation of ocean resources, promoting sustainable development of coastal areas, and providing technical support for marine science research.
NIOT is involved in research areas such as ocean observation, marine biotechnology, underwater vehicles, ocean renewable energy, marine minerals, and coastal engineering.
NIOT has state-of-the-art facilities for oceanographic research, including research vessels, underwater vehicles, moored buoys, and coastal monitoring systems.
NIOT collaborates with other national and international organizations to advance research and development in ocean technology.
NIOT has implemented several projects related to offshore oil and gas exploration, marine aquaculture, deep-sea mining, coastal protection, and ocean renewable energy.
NIOT provides technical support for environmental impact assessment studies related to coastal and offshore development projects.
NIOT provides training and capacity building programs for scientists, engineers, and technicians in the field of ocean technology.