Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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An Investigation of the Solubilization of Primary Sewage Sludge using Lactic Acid Bacteria Cultured in a Glucose and Yeast Extract Medium

Glucose와 Yeast Extract를 이용하여 배양된 유산균을 이용한 하수 일차 슬러지의 가용화

  • Lee, Sang Min (Department of Environmental and Energy Engineering, The University of Suwon) ;
  • Choi, Han Na (Research Institute of Technology, Taeyoung E&C) ;
  • Shin, Jung Hun (Research Institute of Technology, Taeyoung E&C) ;
  • Lee, Eun Young (Department of Environmental and Energy Engineering, The University of Suwon)
  • 이상민 (수원대학교 환경에너지공학과) ;
  • 최한나 ((주)태영건설 기술연구소) ;
  • 신정훈 ((주)태영건설 기술연구소) ;
  • 이은영 (수원대학교 환경에너지공학과)
  • Received : 2012.10.25
  • Accepted : 2012.11.22
  • Published : 2012.12.28
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Abstract

The intention of this research was to investigate the solubilization of primary sewage sludge using lactic acid bacteria cultured in a glucose and yeast extract medium. Glucose as the carbon source and yeast extract as the source of nitrogen were chosen as an economic medium with the potential for the mass production of lactic acid bacteria. The optimal concentrations of the medium were 3% (w/v) glucose and 2% (w/v) yeast extract. In this study, in order to improve field applications for the solubilization of sludge at sewage treatment plants, a powdered form of lactic acid bacteria was produced. The optimal inoculum of the powder for the maximum efficiency of solubilization was 1% (w/v). In that condition, the SCOD value increased from 8600 (mg/L) at the beginning of experiment to 10290 (mg/L) at 96 h, with the highest solubilization rate (20.6% DDCOD) and 11.2% (SCOD). Also, the TVFAs of the lactic acid bacteria inoculation group were produced more than that of the control group. In particular, acetic acid was produced 5 times more in the experimental group than in the control group. In this research, the potential of lactic acid bacteria in the pretreatment of primary sewage sludge as a solubilizer, and as an energy source producer for microbial fuel cells was revealed.

Keywords

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