浄水ケーキに混入するPythium aphanidermatumの発酵熱による殺菌

概要

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Pythium aphanidermatum in sludge from a drinking-water plant was eliminated by heat generated during composting of the sludeg for horticultural use.The minimum level of heat treatment to eliminate P.aphanidermatum in the sludge in a laboratory incubator was 45℃ for 7 days.Fifty m^3 of the sludge in a 2.5-m high pile was mixed with a shovel loader at 3-week intervals for field tests.Inoculum of P.aphanidermatum encapsulated in a nylon screen and buried in the pile was eliminated if temperature exceeded 44℃ for more than 7 days.P.aphanidermatum in naturally infested sludge was not detected 3 months after composting.Although the fungus was occasionally not eliminated because of low temperature in the sludge caused by rainfall and air temperature, covering the sludge pile with a plastic sheet maintained a high temperature in the pile.Incorporating of bark compost into the sludge (1:2, v/v) also maintained a high temperature in the pile.
日本植物病理学会の論文
2000-12-25