| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems in a sewage water purification apparatus which actively utilizes digestion/decomposition functions of soil organisms and soil microorganisms as well as an adsorption function of soil colloids, that the apparatus is difficult to build it as planned, the treatment capacity tends to deteriorate after a long use, and so on, though various improvements have been made so far. SOLUTION: The apparatus is built by laying water permeable concrete trays filled with hardly-water permeable soil containing a phosphor adsorbent without a gap in-between to form a plane, and by laying the other water permeable concrete trays without a gap in-between to form a plane such that the added trays are set over a plurality of first-laid trays, thus stacking the trays to form purification layers. The sewage water is supplied to the top of the apparatus and flows down by permeating through the apparatus. COPYRIGHT: (C)2006,JPO&NCIPI
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