KSBB Journal

The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Effect of Sludge Concentration on Removal of Heavy Metals from Digested Sludge by Thiobacillus ferrooxidans

Thiobacillus ferrooxidans를 이용한 소화 슬러지의 중금속 제거에 미치는 슬러지 농도의 영향

  • 류희욱 (숭실대학교 환경·화학공학과) ;
  • 김윤정 (이화여자대학교 환경공학과) ;
  • 조경숙 (이화여자대학교 환경공학과) ;
  • 강근석 (숭실대학교 통계학과) ;
  • 최형민 (숭실대학교 섬유공학과)
  • Published : 1998.06.01
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Abstract

To investigate the feasibility of the microbial process for removal of heavy metals from the high solid content sludge, the effect of sludge concentration on the solubilization of heavy metals by an iron oxidizing bacterium Thiolbacillus ferrooxidans was examined. With increasing the sludge concentration, the removal efficiency of heavy metals and the oxidation rate of iron were inhibited. Especially, when the sludge concentration is over 5% (w/v), the activity of T. ferrooxidans was remarkably inhibited. This inhibition is considered to occur due to the dissolved inhibitory materials such as organic compounds, heavy metals, and others which were extracted from the sludge during incubation period. In conclusion, the microbial process by T. ferrooxidans is only effectively used in ranges of 1.3 to 4.0% (w/v) sludge concentration.

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