Daily Mail Online, May 12, 2015
The National Green Tribunal has recently raised red flag over waterpurification systems based on reverse osmosis technology, as such filters waste a lot of water. In any case, their use in rural areas in unviable.
Scientists have been engaged in finding low-cost, sustainable water purification systems for use in villages. The Nimbkar Agricultural Research Institute (NARI) based in Phaltan Maharashtra has developed a two-stage water purification system which is low cost, does not require any electricity, and wastes no water like RO.
In the first stage, impure water is filtered through a system consisting of four-layered cotton cloth. In the second stage, this water is filled in four vacuumfilled tubes attached to a manifold. These tubes act as water heaters and can heat filtered water up to 60 degrees, which can kill all harmful bacteria.
Tests done with this system show that water heated to 60 degree C for 15 minutes or 45 C for 3 hours inactivates all water-borne bacteria. The cotton filter, typically an old sari, is washed to ensure there’s no clogging.
“Till now we were advising people to filter water through four-layered cotton cloth and then heat it using conventional heating systems. Now we’ve developed a solar tube heater which does away with use of cooking fuel completely,” explained Anil Rajvanshi, who has developed the system.
The tubular vacuum-based heaters work well under cloudy as well as low sun light conditions.
“We are exploring possibilities of scaling up this technology for village level application so that 30,000 to 40,000 litres of water can be made potable daily,” Rajvanshi says.
Read more: http://www.dailymail.co.uk/indiahome/indianews/article-3077137/QUANTUM-LEAP-Shining-light-medical-corruption.html#ixzz3ZwHzkl56
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