Airing down water
The department of mechanical engineering at the Regional Engineering College in Kurukshetra, Haryana, has developed a portabJe aerator which combines the supply of air and the mixing of water ina single unit. It operates by directing surrounding air to the top of a marine propeller. The propeller agitates and efficiently mixes oxygen with polluted water. Through aerobic reaction, the impurities are oxidised and their toxic effects neutralised. The deVice consumes 0.37 kw of electricity and in the absence of electricity, kerosene can be used to run the motor. The 33 kg-aerator costs Rs 2,500 and can be used to treat industrial effluents and municipal and city discharges.
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