| 摘要 |
<p>PURPOSE:To reduce the output of sludge, and to treat stably by returning a part of the sludge taken out from the final settling pond and the sludge taken out from the initial settling pond to the upper part of the initial settling pond, and incorporating sludge to the overflowing water from the initial settling pond. CONSTITUTION:The raw sludge taken out from the pit pat 2 through a pump 3 and the return sludge from the final settling pond 7 are introduced into the initial settling pond 1 along with the waste water. Denitrification is promoted in the initial settling pond 1 by denitrification bacteria in the activated sludge, and most of the raw sludge to be generated in the initial settling pond 1 is decomposed by oxidation as the organic energy source of the denitrification. The overflowng water contg. sludge from the initial settling pond 1 is transferred into an aeration tank 4 wherein the organic matter is purified by nitration bacteria. The mixed liquid from the aeration tank 4 is separated by settling into a supernatant liquid and activated sludge in the final settling pond 7, and a part of the activated sludge is returned to the initial settling pond 1 and a part is treated as surplus sludge.</p> |
