주방세제가 주방용 오물 분쇄기로부터 회수된 음식물 쓰레기 고형물의 혐기성 분해에 미치는 영향 = The Effect of Kitchen Detergent on the Anaerobic Degradation of Recovered Food Waste Solid from Food Waste Disposers

다국어 초록 (Multilingual Abstract)

In Republic of Korea, waste disposer-treated food waste can be recovered from the waste disposer wastewater before it is discharged into the sewer system. The solid phase in the waste disposer-treated food waste can be subjected to anaerobic digestion. However, it contains kitchen detergent that can inhibit the anaerobic digestion process. The objectives of this study were to evaluate the degradation and phase distribution of kitchen detergent and the effect of the detergent on the anaerobic degradation of the solid phase in the waste disposer-treated food waste. 47-58% (w/w) of detergent existed in the recovered solid phase. According to biochemical methane potential tests, 70% (w/w) of the detergent had been anaerobically degraded and 4-5% and 26-30% (w/w) of the liquid and solid phases remained, respectively. In the range of 0-300 mg/L of kitchen detergent, the maximum methane generation rate slowed as the concentration increased and the maximum methane production was statistically the same. When the detergent concentration was 450 mg/L, the maximum methane production of the recovered food waste decreased by 22.8% (v/v). These indicate that the inhibition on the methane potential would not happen due to degradation of the detergent for an estimated probable concentration of 101.4 mg/L. When considering the expected detergent concentration in the disposer wastewater, the recovered food waste can be used as an anaerobic digestion substrate without inhibiting methane recovery.

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