유기물자원화 (Journal of the Korea Organic Resources Recycling Association)

  • 제31권4호
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  • Pages.51-58
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  • 2023
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  • 1225-6498(pISSN)
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  • 2508-3015(eISSN)
유기성자원학회 (Korea Organic Resources Recycling Association)
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탈황슬러지 및 생슬러지를 이용한 혐기성 병합소화 특성평가

Characteristic evaluation of anaerobic co-digestion using desulfurization sludge and primary sludge

  • 구슬기 (엔텍스(주) 기업부설연구소) ;
  • 정우진 (경기대학교 사회에너지시스템공학과) ;
  • 장순웅 (경기대학교 사회에너지시스템공학과) ;
  • 박명수 (엔텍스(주) 기업부설연구소)
  • Seulki Koo (R&D Center, Entecs Co., Ltd.) ;
  • Woojin Chung (Department of Civil & Energy System Engineering, Kyonggi University) ;
  • Soonwoong Chang (Department of Civil & Energy System Engineering, Kyonggi University) ;
  • Myoungsoo Park (R&D Center, Entecs Co., Ltd.)
  • 투고 : 2023.11.13
  • 심사 : 2023.12.16
  • 발행 : 2023.12.30
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초록

본 연구에서는 혐기성소화에서 황화합물의 영향을 평가하기 위하여 탈황 슬러지 및 하수슬러지(생슬러지)를 이용한 병합소화를 진행하였다. 실험은 500 mL duran bottle을 이용한 batch test의 형태로 수행되었으며, 원료의 혼합 비율은 COD/SO4의 비율을 기준으로 선정하였다. 실험 결과, COD/SO4 20 이하의 혼합 비율에서 바이오가스 발생량 및 수율의 감소가 확인되었다. 특히 COD/SO4 10 이하에서는 식종슬러지에서 자체적으로 발생하는 바이오가스를 보정하기 위해 원료를 투입하지 않은 seed (283.5 mL)보다 낮은 수치를 나타내었다. 메탄 수율의 경우 COD/SO4 50의 0.396 m3 CH4/kg VS에 비해 COD/SO4 20에서 0.135 m3 CH4/kg VS로 급격하게 감소하는 경향을 보였다. 반면, 황화수소의 수율은 COD/SO4 50의 0.0097 m3 H2S/kg VS에 비해 COD/SO4 20의 비율에서 0.0223 m3 H2S/kg VS로 급격하게 증가하였으며, 특히 COD/SO4 10에서 0.0855 m3 H2S/kg VS로 가장 높은 결과를 나타내었다. 이러한 결과를 바탕으로, 혐기성소화에 있어 황화물의 영향은 COD/SO4 비율이 20 이하로 감소할 경우, 악영향을 줄 수 있는 것으로 판단된다.

In this study, anaerobic co-digestion was carried out using desulfurization sludge and sewage sludge (primary sludge) to evaluate the effects of sulfur compounds in anaerobic digestion. The experiment was carried out in the form of a batch test using 500 mL duran bottle, and the mixing ratio of the feedstock was selected based on the ratio of COD/SO4. As a result of the experiment, it was confirmed that the amount of biogas generated and the yield decreased at the mixing ratio of COD/SO4 20 or less. In particular, below COD/SO4 10, it was lower than seed (283.5 mL) which was set without feedstock to correct biogas generated by itself from seed sludge. Methane yield tended to decrease from a ratio of COD/SO4 20 or less to 0.135 m3/kg VS compared to 0.396 m3/kg VS of COD/SO4 50. In addition, compared to 0.0097 m3/kg VS of hydrogen sulfide yield from COD/SO4 50, the ratio of COD/SO4 20 increased sharply to 0.0223 m3/kg VS, and in particular, the highest result was 0.0855 m3/kg VS in COD/SO4 10. Based on these results, it is judged that the effect of sulfide in anaerobic digestion can have an adverse effect if the COD/SO4 ratio decreases to less than 20.

키워드

과제정보

본 연구는 한국환경산업기술원의 지원을 받아 수행한 과제입니다(No.2021002690002).

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