Change in Microflora of Sewage Sludge by Gamma-ray Irradition
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概要
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Total bacteria of activated dewatered sludge cake of Takasaki city which amounted to 2×109 per gram diminished rapidly with the radiation dose, but slowly after 0.5 Mrad, and 103 per gram survived even after 10 Mrad irradiation. However, coliforms which amounted to 8×107 per gram were inactivated below 0.5 Mrad irradiation. The predominant bacteria in non-irradiated sludge were Pseudomonas cepacia and it mainly survived up to 2 Mrad, but Bacillus were predominant at 0.5 to 0.7 Mrad irradiation. The main residual flora from 2 to 5 Mrad was composed of Pseudomonas soranacearum, P. cepacia and P. delafieldii, and the main residual flora in more than 5 Mrad irradiated sludge was P. flava. These typical strains of Pseudomonas in phosphate buffer were radiation sensitive, and their D10 values were from 0.005 to 0.021 Mrad under aerobic irradiation conditions.
- 社団法人 日本農芸化学会の論文
著者
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WATANABE Hiroshi
Takasaki Radiation Chemistry Establishment, Japan Atomic Enerty Research Institute (JAERI)
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Takehisa Masaaki
Takasaki Radiation Chemistry Research Establishment Japan Atomic Energy Research Institute
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Ito Hitoshi
Takasaki Radiation Chemistry Research Estabkishment Japan Atomic Energy Research Institute
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IIZUKA Hiroshi
Institute of Applied Biology, Science University of Tokyo
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