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Use of sand filtration on river water flocculated with Moringa Oleifera
2005 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A great problem in many developing countries is to get clean drinking water at a low price. Many surface drinking water sources in these countries have problems with high turbidity which is normally solved by adding a chemical coagulant such as Aluminium sulphate, which is imported at a high cost. Another solution is to use a natural coagulant which grows in the region such as the seed of Moringa Oleifera. This tree which grows in the tropical and subtropical region and is native to India and Pakistan has for generations been used to purify water by indigenous people in India and Sudan. This study focuses on sand filtration of turbid water using M. Oleifera as a coagulant. With M. Oleifera as a coagulant it was possible to get a fairly good result, about 5 NTU for the low initial turbidity. For the high turbidity the result was generally not very good and the effluent turbidity was around 30 NTU. It was in the sand filter that the largest part of the purification took place. The average purification in the sedimentation tank correlated well to what was seen in the zero tests. Some tests were done with M. Oleifera extracted with salt which seemed to amplify the flocculation. With this method it was possible to get values well below 5 NTU which is the WHO threshold value. Tests made with M. Oleifera mixed with Al-solution showed that it was possible to still get a good result when lowering the Al-concentration with 70% from its optimal concentration. The tests showed that the filter made a big difference for the turbidity of the purified water. Especially for the pure M. Oleifera solution the flocs were small and light and didn’t settle very efficiently with an average of only 30 % purification in the settling tank and about 70 % in the sand filter. The height of the filter was varied during the tests and the result was not unequivocal. No difference could be seen in the tests with pure M. Oleifera, but with the tests with M. Oleifera extracted with salt a clear improvement could be observed.

Place, publisher, year, edition, pages
Keyword [en]
Technology, M. Oleifera, naturliga polymerer, sandfiltrering, vattenrening
Keyword [sv]
URN: urn:nbn:se:ltu:diva-56921ISRN: LTU-EX--05/177--SELocal ID: da6d2c2f-7204-4097-ada7-c3bacb23687fOAI: diva2:1030308
Subject / course
Student thesis, at least 30 credits
Educational program
Environmental Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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