| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for biological river water purification capable of actively utilizing microorganisms regarded as effective in the purification, of easily exchanging an adsorbent in a porous concrete box for a new one at any time when the adsorbent has deteriorated, and of exterminating a harmful insect. <P>SOLUTION: The porous concrete box has some openings in each of its surfaces so that a material for environmental purification packed in a mesh bag for preventing the adsorbent from escaping can be charged into or discharged from the concrete box selectively through the openings in the top surface at any time. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
