Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Effect of Mechanical Agitation on Generation of Airborne Bacteria and Endotoxin in Exhaust Gases from Lab-Scale Composting of Sewage Sludge

실험실 규모 하수슬러지 퇴비화공정에서 기계적 교반이 배출가스 내 부유세균과 내독소의 발생특성에 미치는 영향

  • Kim, Ik-Hyeon (Department of Environmental Engineering, Seoul National University Science and Technology) ;
  • Kim, Ki-Youn (Department of Industrial Health, Catholic University of Pusan) ;
  • Phae, Chae-Gun (Department of Environmental Engineering, Seoul National University Science and Technology) ;
  • Kim, Dae-Keun (Department of Environmental Engineering, Seoul National University Science and Technology)
  • 김익현 (서울과학기술대학교 환경공학과) ;
  • 김기연 (부산가톨릭대학교 산업보건학과) ;
  • 배재근 (서울과학기술대학교 환경공학과) ;
  • 김대근 (서울과학기술대학교 환경공학과)
  • Received : 2012.01.04
  • Accepted : 2012.02.29
  • Published : 2012.03.30
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Abstract

This study was performed to investigate the concentration variation of airborne bacteria and endotoxin by the temperature in the compost pile in order to identify the generation characteristics of biological factors in the exhaust gases generated from lab-scale sludge compositing reactors (0.06 $m^3$ of total reactor volume). Airborne bacteria showed the highest concentration of generation ($1.03{\times}10^5\;CFU/m^3$) in the composting reactor without mechanical agitation, and similar change tendency to temperature variation of composting, but somewhat lower statistical significance (p>0.05). In the compost reactor with mechanical agitation, endotoxin showed similar generation characteristic to temperature variation of composting (statistical significance; p<0.05) and the highest generation concentration to 1,415 EU/$m^3$. Mechanical agitation of the composting process affected activity of microorganism and positive generation of endotoxin in exhaust gases. Endotoxin and airborne bacteria showed similar tendency of generation, especially the highest statistical correlation was observed in the compost reactor without mechanical agitation (statistical significance: p<0.01).

본 연구는 퇴비화 공정에서 발생되는 배출가스 내 생물학적 인자의 발생 특성을 파악하기 위하여 퇴비단 온도변화에 따른 부유세균과 내독소의 발생농도를 관찰하였다. 실험은 도시하수슬러지를 대상으로 실험실 규모의 기계적 교반이 가능한 퇴비화 장치(반응기 부피 0.06 $m^3$)에서 실시되었다. 부유세균은 미교반 퇴비화 공정에서 퇴비단 온도변화와 유사한 발생경향을 보였지만 통계적 유의성이 다소 낮았고(p>0.05), 최고 발생농도는 $1.03{\times}10^5\;CFU/m^3$이었다. 내독소는 기계교반 퇴비화 공정에서 퇴비단의 온도변화와 유사한 발생경향을 보였으며(통계적 유의성: p<0.05), 최고 발생농도는 1,415 EU/$m^3$이었다. 퇴비화 공정의 기계적 교반이 퇴비단 미생물의 활성과 이에 따른 배출가스 중 내독소 발생 증가에 영향을 미친 것으로 보인다. 내독소의 발생농도와 부유세균의 발생농도는 유사한 발생 경향을 보였으며, 특히 미교반 퇴비화공정에서 높은 통계적 상관성이 나타났다(통계적 유의성: p<0.01).

Keywords

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