HARVESTING WATER FROM AIR

A team of researchers at the Indian Institute of Technology-Guwahati (IIT-G) have developed a method for harvesting water from humid air.

About the Method

This method involves spraying a sponge-like porous polymeric material on a normal printer paper.
This method can also be used in underwater hulls of ships and submarines to prevent bio-fouling; and to prevent icing on aircraft windows.
The method mainly uses the principle of hydrophobicity. The lotus leaves exhibit the property of hydrophobicity.
They used ‘Slippery liquid-infused porous surface’ (SLIPS) to effectively harvest water from foggy air.
The SLIPS are capable of harvesting water from air without the use of an external cooling arrangement.
Conventionally, the Atmospheric water generator (AWG) that extracts water from humid ambient air, uses condensation, exposing to desiccants or pressurizing water.

Atmospheric Water Generator

The main principle of operation is condensation.
Here the water vapour in the air is extracted as water by pressuring the air, cooling the air below its dew point and exposing the air to dessicants.
A Dessicant is a hygroscopic substance.
Dew Point is the point to which air should be cooled to make its saturated with water vapour. When cooled further, it will condense into liquid water (or dew).

Source: TH

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