Small Wastewater Treatment Systems Using Soil Purification Method,
SOIL PURIFICATION CENTER LTD TOKYO (JAPAN)
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The purpose of the paper is to describe unique features of the soil purification systems developed in Japan and to discuss construction, operation, and maintenance of the following systems 1 Enhancement of Treatment by Use of Soil Cover. In this process, soils are not used as a mere construction materials, but they are effectively used as a media for supporting microbial life. In actual installations, treatment facilities are constructed underground covered by soil layer. Treatment efficiencies are observed to be greatly increased by the use of soil cover in these instances, and the ground surface can be used for lawn area or other uses for esthetic enjoyment. 2 Underground trench Soil Purification System. By installing an impermenable sheet under the trench, capillary action of soils in horizontal directions is enhanced, thus preventing groundwater pollution due to enhanced soil purification in aerobic soil zone.