有機性廃棄物の高速たい肥化用発酵槽の強制通気方法の改良

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  • Improvement of the Forced Static Aeration Method for High-rate Composting Fermentors for Organic Wastes
  • ユウキセイ ハイキブツ ノ コウソクタイヒカヨウ ハッコウソウ ノ キョウセイ ツウキ ホウホウ ノ カイリョウ

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This study was conducted, by using two 3.5m wide large-scale scoop-type Fermentors with the goal of improving the method of forced static aeration in order to aerate garbage equally in a cross section of the fermentor, and thus, ferment the garbage satisfactorily. The experiments were carried out for about 9 days on garbage sediment about 1, 000-1, 600 mm in height under aeration through aerial-pipes on one side wall of the fermentor. Compared to the conventional method, that is, aeration through pores in the bottom plate of the fermentor, changes in temperature, moisture content, pH, and degradation of organic matter in the garbage in a cross section of the fermentor confirmed that there was a difference in the progress of aerobic fermentation depending on whether the source of aeration was one wall side point, the other wall side point, or the center point of the fermentor. These results indicate that the cause is the difference in the apparent density of garbage at the three points of the fermentor, because of frictional force between the wall of the fermentor and the sediment garbage, and so, the amount of aeration turns out to be unequal. The method of aeration was improved by placing covering plates of 750 or 1, 000 mm width over the porous plate along both walls of the fermentor. In consequence, it was confirmed to improve the aerobic fermentation when the width of covering plates was 750 mm and when it was also aerated through the middle 2, 000 mm width of the porous plate. This result indicates that the amount of aeration for garbage at the wall side point, which is of low apparent density, is restricted by the operation of covering plates, and aeration for garbage at the three points of the fermentor becomes equal.

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  • 廃棄物学会論文誌

    廃棄物学会論文誌 15 (3), 172-181, 2004

    一般社団法人 廃棄物資源循環学会

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