열처리 시간과 pH 하한값이 음식물쓰레기 연속 중온 수소 발효에 미치는 영향 (Effects of Pretreatment Time and pH low set value on Continuous Mesophilic Hydrogen Fermentation of Food Waste)

서지정보

· 발행기관 : 대한상하수도학회
· 수록지 정보 : 상하수도학회지 / 25권 / 3호 / 343 ~ 348페이지
· 저자명 : 김상현, 이채영

초록

Since 2005, food waste has been separately collected and recycled to animalfeed or aerobic compost in South Korea. However, the conventional recycling methods discharge process wastewater, which contain pollutant equivalent to more than 50% of food waste. Therefore, anaerobic digestion is considered as an alternative recycling method of food waste to reduce pollutant and recover renewable energy. Recent studies showed that hydrogen can be produced at acidogenic stage in two-stage anaerobic digestion. In this study, the authors investigated the effects of pretreatment time and pH low set value on continuous mesophilic hydrogen fermentation of food waste. Food waste was successfully converted to H2 when heat-treated at 70oC for 60 min, which was milder than previous studies using pH 12 for 1 day or 90oC. Organic acid production dropped operational pH below 5.0 and caused a metabolic shift from H2/butyrate fermentation to lactate fermentation. Therefore, alkaline addition for operational pH at or over 5.0 was necessary. At pH 5.3, the result showed that the maximum hydrogen productivity and yield of 1.32 m3/m3.d and 0.71 mol/mol carbohydrateadded. Hydrogen production from food waste would be an effective technology for resource recovery as well as waste treatment

영어초록

Since 2005, food waste has been separately collected and recycled to animalfeed or aerobic compost in South Korea. However, the conventional recycling methods discharge process wastewater, which contain pollutant equivalent to more than 50% of food waste. Therefore, anaerobic digestion is considered as an alternative recycling method of food waste to reduce pollutant and recover renewable energy. Recent studies showed that hydrogen can be produced at acidogenic stage in two-stage anaerobic digestion. In this study, the authors investigated the effects of pretreatment time and pH low set value on continuous mesophilic hydrogen fermentation of food waste. Food waste was successfully converted to H2 when heat-treated at 70oC for 60 min, which was milder than previous studies using pH 12 for 1 day or 90oC. Organic acid production dropped operational pH below 5.0 and caused a metabolic shift from H2/butyrate fermentation to lactate fermentation. Therefore, alkaline addition for operational pH at or over 5.0 was necessary. At pH 5.3, the result showed that the maximum hydrogen productivity and yield of 1.32 m3/m3.d and 0.71 mol/mol carbohydrateadded. Hydrogen production from food waste would be an effective technology for resource recovery as well as waste treatment

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