Development of Simple Low Cost Filter and the Determination of Its Optimal Condition in Reducing Iron Oxide of Under Ground Water

Abstract

Some of iron oxide filter were constructed and tested in the project areas, i.e. at ampher Muang, Kamalasai, and Borabu in Khon Kaen, and Mahasarakam province. respectively. The filer unit was aimed to be used for reducing iron oxide from rusty groundwater. There are 2 layers of filter material placed in a concrete ring of 1 m. diameter. The lower layer is a 3/8 in. gravel pack of 0.15 m. thick and the upper one is a mixed- sand pack of 0.4 m. thick.

The result of testing shows that it can reduce iron oxide from raw rusty groundwater. Which contain 1.5 to 15 mg/liter of iron oxide. To be 0.1 to 0.5 mg/liter (equivalent to 95.8% reduction) after the water flow through the filter. According to WHO, the recommended standard drinking water should contains iron oxide not more than 0.3mg/liter. Which means that the constructed iron oxide filter works quite well.