| 摘要 |
<P>PROBLEM TO BE SOLVED: To enhance the denitrification efficiency of a conduit type purification apparatus having a relatively simple configuration with a running cost much inexpensive. <P>SOLUTION: The purification apparatus is employed to purify a conduit 10 which keeps an anaerobic denitrification fungus body 11 grown proliferously and deposited on the bottom by which flowing water to be treated 15 containing nitrate nitrogen or nitrite nitrogen. In this case, the surface of the water to be treated 15 flowing through the conduit 10 is covered by an impervious covering member 16. By covering the surface of the water to be treated 15 with the substantially impervious covering member 16, oxygen is prevented from dissolving into the water to be treated 15, and moreover, green algae is also prevented from reproducing in the water to be treated 15. Thereby the water in the conduit 10 is held anaerobic to enhance the denitrification effect of the anaerobic denitrification fungus body 11, and in the meantime, the heat dissipation to the atmosphere can be prevented in winter, and the solar heat and light could be utilized with a black colored sheet used as the covering member 16. <P>COPYRIGHT: (C)2008,JPO&INPIT |
