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Backwashed Slow Sand Filtration for Water Supply during Droughts Periods in Animal Production

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  21st Century Watershed Technology: Improving Water Quality and Environment Conference Proceedings, 21-24 February 2010, Universidad EARTH, Costa Rica  701P0210cd.(doi:10.13031/2013.29438)
Authors:   M. B D SOARES, B S PIZZOLATTI, L G ROMERO, D G MICHELAN, M L SENS
Keywords:   Water treatment, Backwashed slow sand filtration, Aquaculture Lake, Animal production

This study aimed to present an experience about the technology of the backwashed slow sand filtration to improve the water quality supply for animal production in small rural communities during droughts periods. This technology stands out by being efficient when used in water with medium quality, by the simple design and operation, which requires, little or no consumption of energy and chemicals and, especially, for easy cleaning operation. This real scale technique was employed in an aquaculture lake in the State of Santa Catarina, Brazil during the first half of 2009. The experiment ran for 86 days, including 4 filtration runs in this period. The filter was fed at a rate of 3 m3/m2.d with average raw water turbidity, apparent color and true color of 17.5 NTU, 139.5 CU and 17.5 CU, respectively. Removal efficiencies for turbidity, apparent color and true color of 66%, 53%, and 15% were observed, respectively. Thus, the backwashed slow sand filtration system was able to meet Brazilian water quality standards. However, it is important to make more detailed studies to include other water quality parameters which would definitely spread the technique by providing water to places that suffer from prolonged and severe droughts.

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