Seed power

Published: Wednesday 31 July 1996

Scientists of the University of Leicester, UK, have demonstrated an easy technique by which crushed seeds from the tropical tree Moringa oleifera (drumstick tree) can be used for cleaning contaminated streams. The technique is very effective and works out much cheaper than chemicals such as alum, used for the purpose. According to the scientists, when the crushed seed powder is mixed with water, the seed material produces positively-charged proteins. These proteins interact with the negative charge of the impurities in the water, forming 'coagulated' flocs. The flocs entrap the bacteria and viruses which can be easily removed by filtration ( Vatis Update , Vol 1, No 16).

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