下水汚泥中の細菌数と放射線殺菌効果の季節変動 : 汚泥の放射線殺菌に関する研究(第1報)

概要

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The effect of radiation on sewage sludge wa investigated to disinfect it. The results obtained were as follows : 1. In either activated sludge or digested sludge dewatered by centrifugation, total bacteria and coliforms were up 3.0×10^9/g and 3.5×10^8/g, respectively. In the activated sludge which was dewatered by a filter-press with calcium oxide and iron chloride, total bacteria were up to 3.0×10^5/g, while coliforms were hardly detected.2. The fraction of coliforms was somewhat more in centrifuged sludge than in raw sludge.3. The radiosensitivity of coliforms in raw sludge differed between samples. Namely, some sludge was sterilized with 0.5 Mrad while others were not strerilized even with 1.0 Mrad. On the other hand, coliforms in dewatered sludge were sterilized with 0.5 Mrad without seasonal change, but total bacteria were more radioresistant and more than 13 Mrad was required to reduce it to an undetectable level.From these results it is concluded that the dewatered sludge should be irradiated at 0.5 Mrad to eliminate the coliforms in it.
社団法人日本生物工学会の論文
1981-05-25