Solar Thermanl water purification-The Hindu

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A breakthrough water purification process installed

Innovation: The solar thermal de-fluoridation plant that has been set up at Dandiganahalli in Bangalore Rural district to purify water for the residents of the village. — Photo: K.GOPINATHAN
Innovation: The solar thermal de-fluoridation plant that has been set up at Dandiganahalli in Bangalore Rural district to purify water for the residents of the village. — Photo: K.GOPINATHAN
A recent innovation promises to provide fluoride-free drinking water to the people. The Karnataka Panchayat Raj Engineering Division has set up a “solar thermal de-fluoridation” plant using the “pioneering” Under Solar Magnetic Vaporisation (USMV) technology in Devanahalli taluk of Bangalore Rural district.
The pilot plant, which yields 1,000 litres of chemical-free water a day, has been set up at Dandiganahalli, 15 km from Bengaluru International Airport. According to M.V. Shastri, who has developed the technology and implemented it, and officials of the Panchayat Raj Engineering Division, the Dandiganahalli plant is the first such plant in the country that has been set up using USMV technology.
Mr. Shastri, who works at a private engineering college in Nelamangala, told a media team visiting the plant that water from three to four wells is supplied to the water tank at Dandiganahalli with the average fluoride content at 1.6 mg/litre. The fluoride level of water from one of the bore wells was as high as 4.5 mg/litre. After purification, the level had come down to 0.1 mg/litre while the ideal level is 1 mg/litre.
After a one-year trial run, the Panchayat Raj Department is now planning to supply the purified water to the Dandiganahalli residents from March 10. Each household may get around five litres of pure water daily, Assistant Executive Engineer, Panchayat Raj Engineering Division, Subhan Khan said.
Technology
Mr. Shastri said water is purified in two stages. Partial purification of sediment-filtered water is done through Magnetic Variable System (MVS). Later, it is purified using USMV process. The vapour is condensed and blended to acceptable human consumption. Around 45 chemicals such as fluoride, sodium, chloride, lead and magnesium can be removed from the water using the technology, he claimed.
The solar panels fitted to the plant also generate power necessary to pump the water and operate the unit. On cloudy days, water can be purified using micro membrane method and filtered rainwater harvesting technology, he said.
Meanwhile, S. Ramesh, CEO of Bangalore-based Powertronix Systems Ltd., said his company was planning to take up commercial production of the solar-powered water purification system.
  • Residents of Dandiganahalli to get purified water from March 10
  • Each household to get around five litres daily

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