Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Biological Hydrogen Production from Mixed Organic Waste of Food and Activated Sludge by Pre-treatment

음식물쓰레기와 전처리한 폐활성슬러지의 혼합비율에 따른 생물학적 수소생산

  • Lee, Jun-Cheol (Graduate School of Energy and Environmental, Seoul National University of Technology) ;
  • Kim, Jae-Hyung (Graduate School of Energy and Environmental, Seoul National University of Technology) ;
  • Choi, Kwang-Keun (Central research center Green and Global EnviTech Co. Ltd.) ;
  • Pak, Dae-Won (Graduate School of Energy and Environmental, Seoul National University of Technology)
  • 이준철 (서울산업대학교 에너지환경대학원) ;
  • 김재형 (서울산업대학교 에너지환경대학원) ;
  • 최광근 ((주)지앤지환경기술 중앙연구소) ;
  • 박대원 (서울산업대학교 에너지환경대학원)
  • Published : 2007.09.30
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Abstract

In this study, Bio-hydrogen is produced from organic waste mixtures containing food waste and waste activated sludge (WAS). The effects of different operational factor on hydrogen production, including various solubilization methods for pretreatments of WAS, pH and different ratios of food waste and WAS, were investigated. The highest hydrogen production values are obtained as 4.3 mL $H_2/g$ $VS_{consumed}$ in the case of applying the mixed pre-treatments of alkali and ultrasonic. The pH value in bio-reactor increased from 4 to 8 after the ultrasonic treatment with alkali and the hydrogen yield touched its highest value in the pH range of 5.0 to 5.5. Similarly, the hydrogen production reached the level of 13.8 mL $H_2/g$ $VS_{consumed}$ using the same pre-treatment method from the mixture of food waste and WAS. The ratio of 2 : 1 produced a maximum amount of hydrogen of 5.0 L $H_2/L/d$. The amount of volatile fatty acids(VFAs) including acetate, propionate and butyrate, were also varied considerably. Propionate decreased consistently with rising of hydrogen while butyrate comparing to acetate relatively increased in the effluent.

본 연구는 대표적인 유기성 폐기물인 음식물쓰레기와 폐활성슬러지를 처리함과 동시에 수소를 생물학적인 방법으로 생성하기 위하여 운전인자인 가용화 방법, pH, VFAs 및 음식물쓰레기와 폐활성슬러지의 최적 혼합비율을 도출하고자 하였다. 폐활성슬러지의 수소 생성량을 높이기 위해 다양한 가용화 방법을 적용하여 그에 따른 수소 수율을 비교한 결과 알칼리와 초음파처리 한 병합처리에서 4.3 mL $H_2/g$ $VS_{consumed}$로 가장 높았으며, 음식물쓰레기와 가용화 된 폐활성슬러지를 혼합한 경우에도 병합처리 한 가용화 방법에서 수소 수율이 13.8 mL $H_2/g$ $VS_{consumed}$로 가장 높았다. 또한 pH는 $5.0\sim5.5$에서 운전시 가장 높은 수소 생성량을 보였으며, 음식물쓰레기와 가용화 된 폐활성슬러지의 최적 혼합비율은 2 : 1에서 수소 생성량이 5.0 L $H_2/L/d$로 가장 높았다. 생물학적 수소 생성이 많을수록 VFAs는 프로피온산의 농도가 낮았고, 부티르산이 아세트산보다 높은 비율로 생산되었다.

Keywords

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