음식물폐기물과 축산분뇨 혼합폐수의 이상혐기소화에 따른 소화액의 위생성 연구

Two-Phase Anaerobic Digestion of Food and Livestock Wastewater and Hygienic Aspects of the Digested Water

  • 정두영 (가톨릭대학교 생명환경공학부 환경공학전공) ;
  • 정명희 (가톨릭대학교 생명환경공학부 환경공학전공) ;
  • 김영준 (가톨릭대학교 생명환경공학부 환경공학전공)
  • Jeong, Doo-Young (School of Biotechnology and Environmental Engineering, The Catholic University) ;
  • Chung, Myung-Hee (School of Biotechnology and Environmental Engineering, The Catholic University) ;
  • Kim, Young-Jun (School of Biotechnology and Environmental Engineering, The Catholic University)
  • 투고 : 2009.12.03
  • 심사 : 2009.12.28
  • 발행 : 2009.12.31

초록

음식물류폐수와 축산분뇨를 1:1로 혼합한 폐수를 대상으로 고온/중온의 이상혐기소화공정을 실시하였고 혼합폐수내 병원성미생물의 존재 및 소화과정중 미생물상의 변화를 살펴보았다. 혼합원액내 미생물은 대장균, 분변성 장내세균, 대장균군 등의 장내세균총을 비롯하여 식중독을 일으키는 포도상구균과 살모넬라, 이질의 원인균인 쉬겔라, 유가공제품내 대표적 병원성세균인 리스테리아 및 효모 등이 검출되었다. 혐기소화의 안정화시기는 반응후 21일이 지나서부터 시작하였으며, 이 시기를 전후하여 산 발효조와 메탄발효조에서 각각 80% 및 90% 내외의 가파른 감소율을 보이며 대부분의 미생물이 감소되었다. 안정화이후 유기물의 평균분해율은 메탄발효조에서 60% 내외를 기록하였다. 메탄 발효조를 거친 소화액내 미생물개체수는 반응종료 시점에서 대부분 불검출 되었으나, 리스테리아와 포도상구균의 경우, 비교적 완만한 감소세를 보이며 반응최종일까지 검출이 되고 있음을 확인하였다.

Temperature phase anaerobic co-digestion process was conducted with the one to one mixture of food wastewater with livestock wastewater, and the presence and the dynamics of various pathogenic microorganisms was analyzed. The mixture contained various enteric and pathogenic bacteria, such as Escherichia coli. Enterobacteriaceae, Coliform bacteria. Staphylococcus aureus, Salmonella, Shigella, Listeria, and Yeast. Anaerobic digestion has become stabilized around 21 days after the reaction started, showing about 80% to 90% of remarkable reduction rates of microorganisms until this period in acidogenic reactor (AR) and methanogenic reactor (MR), respect ively. After stabilization, the average reduction rate of organic matter was recorded as around 60% in MR. Most microorganisms in the effluent were not detected at around the last period of the reaction, except Listeria and S. aureus, which showed the growth even at the last day of the reaction.

키워드

참고문헌

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