生ごみの高速たい肥化における通気量と切返し頻度の効果

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タイトル別名
  • Effects of Static Aeration and Scooping up on the Composting of Garbage
  • ナマゴミ ノ コウソク タイヒカ ニ オケル ツウキリョウ ト キリカエシヒンド ノ コウカ

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This study verified the most suitable conditions for static aeration and scooping up time in composting. Garbage was fed to a scoop-type fermentor, which could compost one ton of raw material per day. A first series of experiments was carried out to evaluate the effect of aeration with a constant scooping up time (5 times a day) . The experiments were conducted under the three aeration rates of zero, 370 and 900l/min for one dry-weight ton of garbage and paper, as the composition of the raw material. The experiment with the 900l/min aeration rate showed the fastest rate of increase of temperature, pH and degradability of organic matter. However it was expected that the microorganism activity might be decreased by the excessive decline in moisture content under this condition. Furthermore the rate of increase of temperature and pH at the early stage of composting and the amount of degraded organic matter in the 370l/min aeration experiment were not so different from those of the 900l/min experiment. Hence, if we consider the plant investment and running costs of a practical plant, the most suitable condition for static aeration should be 370l/min. In the next series of experiments, the effect of scooping up time was examined at a regular static aeration rate (370l/min) . The experiments were carried out for six scooping up conditions; one, 3, and 5 times over a day, and 3, 6, and 12 times over a night and day. A faster rate of increase of temperature and pH at the early stage of composting was obtained in the higher scooping up frequency, although there was very little difference in the degradability of organic matter among the experiments. It seemed that the excessive high temperature in the later stage of the experiments depressed the microorganism activities. Since the excessive scooping up at this stage tends to cause temperature decrease, we should choose a suitable scooping up frequency.

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  • 廃棄物学会論文誌

    廃棄物学会論文誌 11 (4), 204-213, 2000

    一般社団法人 廃棄物資源循環学会

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