Journal of the Korea Organic Resources Recycling Association (유기물자원화)

Korea Organic Resources Recycling Association (유기성자원학회)
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A study for Solubilization and Bioavailability of Sewage Sludge Using the Complex Pre-treatment

복합 전처리를 통한 하수슬러지의 가용화 및 생물학적 유용성에 관한 연구

  • Kang, Jung-Hyun (Department of Environmental Engineering, Seoul National University of Science & Technology) ;
  • Lee, Hee-Soo (Department of Environmental Engineering, Seoul National University of Science & Technology) ;
  • Lee, Tae-Jin (Department of Environmental Engineering, Seoul National University of Science & Technology)
  • 강정현 (서울과학기술대학교 환경공학과) ;
  • 이희수 (서울과학기술대학교 환경공학과) ;
  • 이태진 (서울과학기술대학교 환경공학과)
  • Received : 2011.07.28
  • Accepted : 2011.09.24
  • Published : 2011.09.30
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Abstract

In this study, anaerobic biological decomposition were attempted after solubilization treatment of sewage sludge with the complex pre-treatment (acid/base treatment with ultrasonic radiation). Solubilization ratios were compared for ultrasonic treatment at acid or base condition. Solubilization effect of the complex pre-treatment was more effective at higher pH. Biological decomposition of complex pre-treated sludge was faster than non treated (raw) sludge, showing 10 times higher total gas production. Biological digestion of the sludge shows more biogas production. B/A ratio. which indicates hydrogen production potential, was 50% higher with complex pre-treated sludge than raw sludge but lactic acid or propionic acid were also detected during anaerobic decomposition process.

본 연구에서는 하수슬러지를 전처리 과정을 통해 가용화한 후 혐기성 생물학적 분해를 실시하였다. 산 또는 알칼리 조건과 초음파처리를 복합적으로 적용하여 전처리 후 슬러지의 가용화율을 비교하였으며 알칼리 조건에서 초음파처리를 병행하였을 때 최대 가용화율을 얻을 수 있었다. 가용화된 슬러지의 생물학적 유용성은 복합전처리를 실시한 경우 빠른 생물학적 분해와 더불어 총 가스 발생량은 10배 이상 증가하였으며 가용화된 슬러지에서 바이오가스 생산 가능성을 확인 하였다. 전처리를 실시한 슬러지를 이용하여 생물학적 분해를 실시하였을 때 약 50%정도 높은 수소생성율의 지표가 되는 B/A비를 확인할 수 있었으나 수소생성에 저해가 되는 lactic acid와 propionic acid가 검출되는 것으로 보아 후속연구가 필요할 것으로 판단되었다.

Keywords

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