유기물자원화 (Journal of the Korea Organic Resources Recycling Association)

  • 제26권4호
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  • Pages.53-61
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  • 2018
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  • 1225-6498(pISSN)
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  • 2508-3015(eISSN)
유기성자원학회 (Korea Organic Resources Recycling Association)
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생물전기화학혐기소화조를 이용한 바이오가스생산에서 폐활성슬러지 혼합비의 영향

Effect of Waste Activated Sludge Mixing Ratio on the Biogas Production in Bioelectrochemical Anaerobic Digestion

  • 정재우 (경남과학기술대학교 환경공학과) ;
  • 이명은 (경남과학기술대학교 환경공학과) ;
  • 서선철 (용진환경) ;
  • 안용태 (경남과학기술대학교 에너지공학과)
  • Chung, Jae-Woo (Department of Environmental Engineering, Gyeongnam National University of Science and Technology (GNTECH)) ;
  • Lee, Myoung-Eun (Department of Environmental Engineering, Gyeongnam National University of Science and Technology (GNTECH)) ;
  • Seo, Sun-Chul (Wastewater Treatment Department, Yongjin Environment Co. Ltd) ;
  • Ahn, Yongtae (Department of Energy Engineering, Gyeongnam National University of Science and Technology (GNTECH))
  • 투고 : 2018.12.11
  • 심사 : 2018.12.18
  • 발행 : 2018.12.30
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초록

혐기성소화(AD)는 폐활성슬러지의 유기물함량을 바이오가스로 전환할 수 있는 가장 널리 이용되는 공정 중 하나이다. 그러나 현재 전통적인 혐기성소화에 의한 실제 메탄수율은 이론적인 최대 메탄수율에 미치지 못하기 때문에 메탄수율을 높일 수 있는 방안의 지속적인 연구가 필요하다. 따라서 본 연구에서는 폐활성슬러지로부터 메탄수율을 높이기 위해 생물전기화학 혐기성소화조를 이용하여 혐기성소화슬러지와 생슬러지의 혼합비율(3:7, 5:5)에 따른 메탄수율 및 유기물제거 효율에 미치는 영향에 관하였다. 그 결과 생물전기화학 혐기성소화 슬러지의 혼합비가 3:7과 비교하여 5:5일 때 가장 높은 메탄수율 294.2 mL $CH_4/L$(0.63배 증가)과 52.5%(7.5% 증가)로 유기물제거효율을 가지는 것으로 나타났으며 pH, 알칼리도와 VFAs의 농도도 안정적으로 유지되었다. 이러한 결과는 혐기성소화 슬러지의 혼합비의 증가는 생물전기화학 혐기성소화조의 안정적인 성능유지를 위해 효과적인 것으로 나타났다.

Anaerobic digestion (AD) is one of the most widely used process that can convert the organic fraction of waste activated sludge (WAS) into biogas. However, most researched actual methane yields of anaerobic digester (AD) on lab scale is lower than theoretical ones. Bioelectrochemical, anaerobic digester was used to increase methane yield from waste activated sludge. The influence of anaerobic digestion sludge and raw sludge mixing ratio (3:7, 5:5) on methane yield and organic matter removal efficiency were explored. As a result, when the mixing ratio of bioelectrochemical anaerobic sludge was 5:5 compared with 3:7, the highest methane yields were 294.2 mL $CH_4/L$ (0.63 times increase) and 52.5% (7.5% increase), the bioelectrochemical anaerobic digester(5:5) was more stable in the pH, t otal alkalinity and VFAs, respectively. These results showed that the increase in the mixing ratio of anaerobic digestion sludge was found to be effective for maintaining the stable performance of bioelectrochemical anaerobic digester.

키워드

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