A Study on the Design Papameters of Slow Sand Filters

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Yousif Ali, Yousif
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Scarcity and insufficiency of groundwater dictates utilization of available surface water in the locality. This would ask in majority of cases for adoption of appropriate purification techniques and in this regard slow sand filters play. A paramount role, especially in developing countries. The suitability of the technique would ask for availability of required land areas and filtration material. The merits of slow sand filters could be summarized as follows: 1. They are easy to construct, operate and maintain. 2. They are reliable and efficient 3. They do not require equipments apart from pumps, spare parts and fuel The enumerated advantages of slow sand filters have lead to an increasing interest in their application in many countries i. e the Sudan is by no means an exception. These filters are widely used in rural Sudan (Gezera, New Halfa and Rahad Agricultural Schemes etc.) .However, the adopted design parameters have not been assessed and evaluated. Therefore their relivance, reliability and acceptability need to be tested to suit rural fringes. This guided to this study which was carried on a pilot plant constructed at Village 17 of Rahad Agricultural Scheme (figs.(l-a),(l-b) Water characteristics that have been studied at El Fau laboratory included turbidity, E. Coli, pH and optical density. The results obtained were satisfactory and encouraging with respect to the characteristics indicated above. It can be concluded that the design parameters adopted in Sudan are satisfactory and they gave an acceptable performance regarding turbidity , E. Coli, pH and optical density if the filters are properly Operated and maintained .
Design, Papameters , Slow, Sand, Filters