Journal of the Korean Society of Mineral and Energy Resources Engineers (한국자원공학회지)

The Korean Society of Mineral and Energy Resources Engineers (한국자원공학회)
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Study on Determination of Design Factor of Bioreactor for Sulfate Reduction in Mine Drainage

광산배수 내 황산염 저감을 위한 생물반응기의 설계인자 도출 연구

  • 김강호 (한국광해관리공단 광해기술원) ;
  • 강찬웅 (한양대학교 자원환경공학과) ;
  • 김선준 (한양대학교 자원환경공학과) ;
  • 김태혁 (한국광해관리공단 광해기술원) ;
  • 지원현 (한국광해관리공단 광해기술원) ;
  • 장항석 (한국광해관리공단 광해기술원) ;
  • 박현성 (한국광해관리공단 광해기술원)
  • Received : 2018.11.22
  • Accepted : 2018.12.20
  • Published : 2018.12.31
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Abstract

Column tests of a sulfate reducing bacteria (SRB) bioreactor were conducted to determine the design factors for sulfate-rich mine drainage. Various substrates were applied to the bioreactor, including cow manure and its mixture with a mushroom compost, with rice straw and limestone as subsidiary materials. This procedure provided a removal efficiency of up to 82% of the total sulfur with the mixture of cow manure (70%), mushroom compost (10%) and rice straw (20%), and higher efficiencies were observed after 2 days of retention time. In the downflow condition of the flow direction, oxygen supply and re-oxidation of the sulfates occurred, causing a decrease in sulfate removal efficiency. The addition of an inorganic sludge containing heavy metals, which was intended for production of metal-sulfides in the bioreactor, had a negative effect on the long-term operation owing to arsenic release and toxicity to the SRB. The results thus show that a bioreactor using a mixed substrate with cow manure and operating in the downflow direction could reduce sulfates and total dissolved sulfur content; this process confirms the applicability of the SRB bioreactor to sulfate-rich saline drainage.

황산염 함량이 높은 광산배수를 대상으로 황산염환원균(Sulfate reducing bacteria, SRB)을 이용한 생물반응기의 설계인자를 도출하고자 컬럼실험을 수행하였다. 생물반응기의 기질물질로 우분을 기본으로 하여 버섯퇴비를 혼합하고, 보조제로써 볏짚, 석회석을 각각 혼합하여 적용하였다. 우분(70%), 버섯퇴비(10%), 볏짚(20%)을 기질물질로 사용하였을 때 최대 82%의 용존된 총 황 제거효율을 보였고, 체류시간은 2일 일 때 높은 효율을 보였다. 생물반응기 내 광산배수의 흐름이 상향류 일 때 배출수 내 환원형태의 황이 산소와 직접 접촉하면서 재산화되어 제거효율이 감소하는 것으로 나타났다. 황산염환원에 따른 금속 황화물 형성을 유도하기 위한 무기성 슬러지의 주입은 비소의 환원성 용해 및 SRB에 독성을 발현하여 생물반응기의 장기적 운영을 저해할 수 있다. 연구결과, 우분을 포함한 혼합기질물질을 활용한 하향류의 생물반응기가 황산염 및 용존된 총 황을 효과적으로 제거하였고, 이는 황산염 함유량이 높은 염수의 광산배수에서 적용이 가능할 것으로 판단된다.

Keywords

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