Yes, two desalination plants were set up in Chennai and the city of Chennai is already using the desalinated water.
The government of Gujarat has announced plans of setting up a 100 MLD RO plant at the Jodiya coast in Jamnagar district.
Enrich Your Learning:
‘RO Desalination’ or Reverse Osmosis Desalination
- RO Desalination is one of the technique used to desalinate the brackish or salty water.
- RO is the most prevalent technology to convert salt water into freshwater.
- In this technology, a plant pumps in salty or brackish water, filters separate the salt from the water, and the salty water is returned to the sea.
- In a reverse osmosis system, an external pressure is applied to reverse the natural flow of solvent (which is from an area of low solute concentration to an area of high solute concentration).
- Seawater or brackish water is pressurized against one surface of the membrane.
- The pressure allows salt-depleted water to move across the membrane, releasing clean water from the low-pressure side.
- Seawater has Total Dissolved Solids (TDS) close to 35,000 parts per million (ppm) which is equivalent to 35g of salt per one liter/kg of water.
TDS level as per WHO in drinking water:
- Excellent, less than 300 mg/litre
- Good, between 300 and 600 mg/litre
- Fair, between 600 and 900 mg/litre
- Poor, between 900 and 1200 mg/litre
- Unacceptable, greater than 1200 mg/litre; extremely low concentrations of TDS