One of the possibilities that the group is considering as a way to improve the biological quality of the water is the slow sand filter. The way that the filter purifies the water is by using the biological layer that forms on the top 10 cm of the fine sand which traps bacteria residing in the water and the rest of the fine sand acts as a medium to help filter the water. This biological layer is formed in the first 10-20 days of operation and after the filter has been used for several weeks it will require cleaning which consists of scraping the biological layer and restarting the process. However cost effective this method is,it can deal only with water of low turbidity levels and therefore may not work for Ban Huay Mii in the rainy season.
Other solutions and combinations of solutions to come in next posts.
References : Integrated Development Assessment,Bo Klua, Thailand,Field Assessment August – September 2009-March 2010,By Alexander J. Moseson,Drexel University,Philadelphia,,Pennsylvania, USA,Bob Shim,Sustainable Development Research Foundation ,(SDRF),Udonthani, Thailand ; Slow Sand Filtration for community Water Supply
By: J.T. Visscher, R. Paramasivan, A. Raman, and H.A. Heijnen ;
http://www.drinking-water.org/html/en/ImageView/00000294.html
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