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Alum sludge dewatering using Moringa oleifera as a conditioner
KTH, Superseded Departments, Land and Water Resources Engineering.
KTH, Superseded Departments, Land and Water Resources Engineering.
2004 (English)In: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 158, no 1, 153-167 p.Article in journal (Refereed) Published
Abstract [en]

An active component of Moringa oleifera ( MO) has been used in comparison with synthetic polymers and alum for the conditioning of chemical sludge from a drinking water treatment plant. The comparison was based on dewatering characteristics of the conditioned sludge determined by capillary suction time (CST), specific resistance to filtration (SRF), sand column drainage and shear strength tests. The results indicated that MO showed comparable conditioning effect as alum. Polyelectrolytes were more effective than MO and alum. Sludge conditioned with MO and alum, as in dual chemical conditioning, showed better results than MO alone. According to CST, SRF and sand drainage results, optimum doses for MO, alum and polyelectrolytes were 125, 63, and 1.8 kg/t, respectively. Comparison of the two polyelectrolytes showed that the cationic polyelectrolyte was more effective. For sand drainage tests both polyelectrolytes improved the drainage rate by 2 orders of magnitude. MO and alum improved the drainage rate by about 4.2 times. On the other hand, the improvements in cake solids concentration were similar for all the chemical conditioners. Flocs from MO and alum were relatively stronger compared to those of the polyelectrolytes. From the results of the study it could be concluded that MO alone or in combination could be effectively used and replace alum for dewatering of chemical sludge.

Place, publisher, year, edition, pages
2004. Vol. 158, no 1, 153-167 p.
Keyword [en]
alum, column drainage, CST, Moringa oleifera, polyelectrolyte, shear strength, sludge conditioning, SRF, water treatment sludge
URN: urn:nbn:se:kth:diva-40556DOI: 10.1023/B:WATE.0000044852.23764.9cISI: 000224436100012ScopusID: 2-s2.0-6044252425OAI: diva2:441578
QC 20110916Available from: 2011-09-16 Created: 2011-09-16 Last updated: 2011-09-16Bibliographically approved

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Ghebremichael, KebreabHultman, Bengt
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