著者

加来 伸夫 渡辺 昌規

出版者

山形大学

雑誌

基盤研究(C)

巻号頁・発行日

2013-04-01

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水田土壌微生物燃料電池(水田MFC)の負極バイオマスの細菌群集構造をPCR-DGGE解析により調べた結果、Rhizomicrobium属の微生物が検出された。また、負極からはClostridia綱に配属される電流発生細菌が分離され、電流発生細菌が多様であることを示していた。肥料の違いは、水田土壌MFCにおける起電力に影響し、堆肥の施用は発電を低下させることが示唆された。阻害実験を行ったところ、メタン生成は発電と競合する一方で、硫酸還元は発電に寄与していることが示唆された。これらの結果とポット試験の結果から、水田MFCを利用することで水田土壌からのメタン放出を抑制できる可能性が示唆された。

著者

森 勇人 高橋 弘 加来 伸夫 西村 宏之

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.132, no.12, pp.182-189, 2016-12-01 (Released:2016-12-15)

参考文献数

14

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It is difficult to reuse the construction sludge directly because the water content of it is extremely high. Therefore, it has been disposed as industrial waste in the final disposal site. In order to reduce the construction cost and environmental load, the effective reuse of construction sludge has been an important problem. In order to increase the recycling rate of construction sludge and to solve the above mentioned problem, the authors have already developed a new recycling method for construction sludge by using paper debris and cement. As this method can improve the high water content sludge into high quality ground materials on sites, this method has already been utilized in over 400 construction sites in Japan.On the other hand, the biodegradation of fibrous materials is not made clear as yet. It is considered qualitatively that fibrous materials used in this method is hard to be biodegraded by soil microbes, because fibrous materials still remains in the soil which was improved by this method 10 years ago. However, the degradation by soil microbes is not confirmed quantitatively.Therefore, the biodegradability of fibrous materials was investigated experimentally through a culture test and a soil buried test. As a result, it was found that paper fragments were degraded in the solution of pH7.0, but were not degraded in the solution of pH9.5. Furthermore, it was confirmed through soil buried test that paper fragments buried in the normal mud were degraded significantly, but those buried in Fiber-Cement-Stabilized soils were not degraded and fibrous materials remained. Therefore, it was concluded that the fibrous materials in Fiber-Cement-Stabilized soil are not degraded by soil microbes when pH of Fiber-Cement-Stabilized soil is over 9.5, and they remains in the modified soils for a long time.