Analysis of Microbial Solubilization and Decomposition of Disposer Wastewater.

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  • ディスポーザ排水の生物学的可溶化・資化反応特性
  • ディスポーザ ハイスイ ノ セイブツガクテキ カヨウカ シカ ハンノウ トクセイ

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Abstract

Biological treatment of disposer wastewater consists of two biological process; solubilization of kitchen garbage and decomposition of solubilized garbage. Comparative analyses of biological solubilization and decomposition of disposer wastewater in different temperature (13 and 20 ℃) and aeration condition (aeration and non-aeration) were conducted. The solubilization rate of kitchen garbage was affected by both temperature and aeration condition, and highest solubilization rate was obtained in high temperature and aerated condition. Although temperature had an insignificant effect on decomposition of solubilized organic components, the aeration accelerated decrease in SS, BOD and D－BOD. In the non-aeration condition, SS decreased gradually, however, little decrease of BOD and increase of D－BOD were observed. The concentrations of carbohydrate, protein and lipid showed that differences in changes of BOD and D－BOD concentrations in different aeration condition was due to low degradation rate of intermediates such as organic acid and alcohol in non-aeration condition. When the temperature of bench-scale reactor treating disposer wastewater was raised from 13 to 20 ℃, solubilization of the garbage trapped in anaerobic solubilization tank was progressed and temporal deterioration of treatment performance was observed. According to these characteristics of the garbage solubilization and degradation, progress of trapped garbage solubilization by circulation of aerated water from aerobic tank to anaerobic tank could be effective to alleviate deterioration of treatment performance after water temperature increase.

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