著者

関 平和 小森 友明

出版者

The Society of Agricultural Meteorology of Japan

雑誌

農業気象 (ISSN:00218588)

巻号頁・発行日

vol.41, no.3, pp.257-264, 1985-12-10 (Released:2010-02-25)

参考文献数

8

被引用文献数

2

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Experiments for extraction and accumulation of the heat generated in composting process were performed using a buried-tube-type heat exchanger and an accumulator. Water was circulated between the heat exchanger and the accumulator as a heat transfer medium. The following results were obtained.1) The compost bed maintained its average temperature at 50°C or higher for about 60 days of the whole period of composting reaction in the first stage (72 days). During this high temperature period, the experiments for heat extraction and accumulation were made by circulating water intermittently or continuously. In the case of the intermittent water-circulation, the water temperature of the accumulator attained to a designed temperature, 30°C, when the room temperature was higher than 10°C, but never did the water temperature when the room temperature was lower than 5°C. With the continuous water-circulation, the water temperature at the steady state condition was in average of 16 through 24°C.2) The apparent rate of heat generation in the compost bed was 200 through 300kcal/m3hr during an early period of about 40 days, which included a turning of the compost bed. The composting reaction was therefore not likely to be inhibited by extracting heat from the bed during the period of intermittent water-circulation experiments.3) The efficiency of heat extraction was 17-26% in the intermittent water-circulation, while the efficiency of heat collection at the steady state condition was 27-32% in the continuous water-circulation. These efficiencies could increase by the well designed arrangement and the increased number of the buried tubes.4) It is necessary to investigate the method for deciding the optimum scale or size of the container for the compost and the heat accumulator on the basis of the theoretical analysis of heat transfer processes.

著者

池本 良子 小森 友明 井出 康行 金井 一人

出版者

Society of Environmental Conservation Engineering

雑誌

環境技術 (ISSN:03889459)

巻号頁・発行日

vol.27, no.6, pp.432-439, 1998-06-20 (Released:2010-03-18)

参考文献数

10

被引用文献数

3 4

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2槽型上向流生物ろ床装置を用いて硫酸塩還元と硫黄脱窒を組み合わせた処理法の可能性について検討した.人工廃水を供給した第1槽で硫酸塩還元を優先して起こすことができた.第1槽流出水とともに硝化液循環を想定して硝酸を供給した第2槽では, 他栄養性脱窒と硫黄脱窒が同時に進行した.第2槽において硫酸塩還元活性が認められた.両槽に生育した硫酸塩還元細菌はプロピオン酸もしくは類似の有機物からの酢酸の生成に量論的に関与していた.第2槽中の硫黄脱窒細菌は硫酸塩還元によって第1槽から供給された硫化物を利用して量論的に脱窒を行った.第2槽中の他栄養性脱窒細菌は第1槽から供給された酢酸を利用して量論的に脱窒を行った.本処理槽の汚泥発生量は少なく, 運転期間を通じて汚泥の引き抜きの必要はなかった.装置内の微生物の反応について, 熱力学的に考察を行い, 処理槽内で微生物の住み分けが起こっていることを推定した.