Journal of the Korea Organic Resources Recycling Association (유기물자원화)

Korea Organic Resources Recycling Association (유기성자원학회)
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Effects of diverse Pre-treatment methods on the sludge digestion and methane production in combined mesophilic anaerobic and thermophilic aerobic sludge digestion process

다양한 전처리에 따른 중온혐기-고온호기 복합 슬러지 처리공정의 슬러지 처리효율 및 메탄 생성량 변화

  • Ha, Jeong Hyub (Department of Chemical Engineering, Pohang University of Science and Technolog) ;
  • Park, Jong Moon (Division of Advanced Nuclear Engineering, Pohang University of Science and Technolog) ;
  • Park, Sang Kyu (Department of Chemical Engineering, Pohang University of Science and Technolog) ;
  • Cho, Hyun Uk (School of Environmental Engineering, Pohang University of Science and Technolog) ;
  • Jang, Hyun Min (School of Environmental Engineering, Pohang University of Science and Technolog) ;
  • Choi, Suk Soon (Department of Biological and Environmental Engineering, Semyung University)
  • 하정협 (포항공과대학교 화학공학과) ;
  • 박종문 (포항공과대학교 첨단원자력공학부) ;
  • 박상규 (포항공과대학교 화학공학과) ;
  • 조현욱 (포항공과대학교 환경공학부) ;
  • 장현민 (포항공과대학교 환경공학부) ;
  • 최석순 (세명대학교 바이오환경공학과)
  • Published : 2013.09.30
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Abstract

In this study, various influent sludge pre-treatment methods were adopted to investigate their effects on the sludge digestion and methane production in combined mesophilic anaerobic and thermophilic aerobic sludge digestion process. A lab-scale sewage sludge digestion process was operated during 4 phases using different feed sludge pre-treatment strategies. In phase 1, feed sludge was supplied without any pre-treatment. In contrast, in phases 2, 3 and 4, thermal, thermal-alkaline and long time alkaline treatment (7 days) were applied to influent sludge, respectively. With sludge pre-treatment, TCOD removal was drastically increased from 44% to 76% from phases 1 to 4, respectively. Also, pre-treatment of feed sludge significantly improved the methane production rate of MAD, showing an increment from 101 to 165-256mL/L/day. Meanwhile, TCOD removal and methane production at phase 4 were not increased, compared to those at phase 3. Based on the experimental results, it was concluded that pre-treatment of feed sludge significantly increases the efficiency of sludge digestion and thermal-alkaline method was the most effective method among the pre-treatment methods examined.

본 연구에서는 유입 슬러지에 다양한 전처리 방법을 적용하여 전처리 방법이 중온혐기-고온호기 복합 슬러지 처리 공정의 슬러지 소화효율과 메탄가스 생성량에 미치는 영향을 비교 검증하였다. 실험실 규모의 슬러지 소화장치를 제작하여 서로 다른 유입 슬러지 전처리방법을 적용하여 4단계로 실험을 진행하였다. 1단계에서는 전처리를 하지 않은 슬러지를 공급하였고, 2, 3, 4단계에서는 각각 열처리, 열-알칼리처리, 장기 알칼리 처리(7일)를 거친 유입 슬러지를 공급하였다. 실험 결과, 1단계에서 4단계까지 진행되는 동안 총COD 제거율은 44%에서 76%까지 증가하였으며, 메탄 생성량 또한 101mL/L/day에서 165, 256mL/L/day까지 크게 증가하였다. 한편, 4단계에서는 7일간의 장기 알칼리 처리를 하였음에도 불구하고 3단계에 비해 총COD 제거율과 메탄 생성량이 증가하지 않았다. 결론적으로, 유입 슬러지의 전처리를 통해 복합 슬러지 처리 공정의 슬러지 제거 효율과 메탄생성량을 크게 증가시킬 수 있었으며, 여러 가지 전처리 방법 중 열-알칼리 처리법이 가장 효율적임을 실험결과를 통해 알 수 있었다.

Keywords

References

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