期刊
ENVIRONMENTAL TECHNOLOGY
卷 30, 期 6, 页码 525-534出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330902831176
关键词
Moringa oleifera; flocculation; natural coagulants; slow sand filtration; Kozeny
资金
- Programa de Iniciacion a la Investigacion
- Universidad de Extremadura
- Comision Interministerial de Ciencia y Tecnologia (CICYT) [CTQ 2007-60255/PPQ]
- Junta de Extremadura [PRI-07A031]
Moringa oleifera extract is a high-capacity flocculant agent for turbidity removal in surface water treatment. A complete study of a pilot-plant installation has been carried out. Because of flocculent sedimentability of treated water, a residual turbidity occured in the pilot plant (around 30 NTU), which could not be reduced just by a coagulation-flocculation-sedimentation process. Because of this limitation, the pilot plant (excluded filtration) achieved a turbidity removal up to 70%. A slow sand filter was put in as a complement to installation. A clogging process was characterized, according to Carman-Kozeny's hydraulic hypothesis. Kozeny's k parameter was found to be 4.18. Through fouling stages, this k parameter was found to be up to 6.36. The obtained data are relevant for the design of a real filter in a continuous-feeding pilot plant. Slow sand filtration is highly recommended owing to its low cost, easy-handling and low maintenance, so it is a very good complement to Moringa water treatment in developing countries.
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