Low-Temperature Thermal Desalination (LTTD)

Why in news?

• The Ministry of Earth Sciences (MoES) through its autonomous Institute National Institute of Ocean Technology (NIOT) has developed and demonstrated Low-Temperature Thermal Desalination (LTTD) technology in Lakshadweep islands.

About Low-temperature thermal desalination (LTTD):

• Low-temperature thermal desalination (LTTD) is a desalination technique for the conversion of seawater to potable water.
• This technique works on the principle that water in the ocean 1,000 or 2,000 feet below is about 4º C to 8º C colder than surface water. So, salty surface water is collected in a tank and subject to high pressure (via an external power source). This pressured water vapourises and is trapped in tubes or a chamber.
• Cold water plumbed from the ocean depths is passed over these tubes and the vapour condenses into fresh water and the resulting salt is diverted away.
• The LTTD technology does not require any chemical pre- and post-treatment of seawater and thus the pollution problems are minimal and suitable for island territories.
• Since no effluent treatment is required, it gives less operational maintenance problems compared to other desalination processes.

PRACTICE QUESTION:

Consider the following statements regarding Low-Temperature Thermal Desalination (LTTD) technology?

1. It is a desalination technique for the conversion of seawater to potable water

2. It does not require any chemical pre-and post-treatment of seawater

3. It has less operational maintenance problems compared to other desalination processes

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1,2 and 3

                          D

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