RO method of water purification - Environment & Biodiversity

Q.  The RO method of water purification uses which of the following method to purify water?
- Published on 31 Aug 15

a. Water is passed through low intensity UV radiations.
b. A semi - permeable membrane is used.
c. Water is boiled, passed through UV radiations and then cooled again.
d. Chemicals are used for filtration and purification.

ANSWER: A semi - permeable membrane is used.
 
In Reverse Osmosis or RO method, water is forced through a semi - permeable membrane. This filters unwanted substances. It uses no chemicals and can be used to desalinate seawater. The membranes however need to be manufactured and later disposed off.

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