News: Ministry of Forest, Environment and Climate Change has published a draft notification that prohibits users from installing membrane-based water purification, mainly reverse osmosis, systems in their homes if the water meets the Bureau of Indian Standards’ drinking water norms.
Membrane-based water purification
- It is a process that removes unwanted constituents from water using a membrane. Different techniques include:
o Membrane Filtration – Microfiltration and Ultrafiltration
o Reverse Osmosis – Nanofiltration/Membrane Softening
Reverse Osmosis: It occurs when water moves through a semi-permeable membrane in the direction opposite to that for natural osmosis. This happens when the water is pushed under greater pressure than the osmotic pressure
Osmosis: It is a phenomenon where water/ solvent flows from a dilute (less concentrated) solution through a semi-permeable membrane to a higher concentrated solution.
Bureau of Indian Standards
- It is the national Standards Body of India working under the aegis of the Ministry of Consumer Affairs, Food & Public Distribution.
- It was established in 1986 and is headquartered in New Delhi.