Journal of the Korea Organic Resources Recycling Association (유기물자원화)

Korea Organic Resources Recycling Association (유기성자원학회)
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Hydrogen Sulfide Removal in Full-scale Landfill Gas Using Leachate and Chelated Iron

침출수 및 철킬레이트를 이용한 실규모 매립가스 내 황화수소 제거

  • Park, Jong-Hun (School of Civil and Environmental Engineering, Yonsei University) ;
  • Kim, Sang-Hyoun (School of Civil and Environmental Engineering, Yonsei University)
  • 박종훈 (연세대학교 건설환경공학과) ;
  • 김상현 (연세대학교 건설환경공학과)
  • Received : 2019.06.10
  • Accepted : 2019.06.24
  • Published : 2019.06.30
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Abstract

$H_2S$ is a detrimental impurity that must be removed for upgrading biogas to biomethane. This study investigates an economic method to mitigate $H_2S$ content, combining scrubbing and aeration. The desulfurization experiments were performed in a laboratory apparatus using EDTA-Fe or landfill leachate as the catalyst and metered mixture of 50-52% (v/v) $CH_4$, 32-33% (v/v) $CO_2$ and 500-1,000 ppmv $H_2S$ balanced by $N_2$ using the C city landfill gas. Dissolved iron concentration in the liquid medium significantly affected the oxidation efficiency of sulfide. Iron components in landfill leachate, which would be available in a biogas/landfill gas utilization facility, was compatible with an external iron chelate. More than 70% of $H_2S$ was removed in a contact time of 9 seconds at iron levels at or over 28 mM. The scrubbing-aeration process would be a feasible and easy-to-operate technology for biogas purification.

황화수소는 매립가스와 바이오가스 사용 전에 제거해야 하는 유해한 불순물이다. 본 연구에서는 공기 산화를 활용한 황화수소 저감 방법을 연구하였다. C시 매립장에서 발생하는 매립가스의 유량 조절이 가능한 실규모 황화수소 저감 장치를 운전하였다. 실험 결과, 세정액 내 용존 철 농도는 황화물 산화 효율에 유의한 영향을 미쳤다. 매립지 발생 침출수 내 철 성분은 매립가스 내 황화수소 제거를 위한 용도로 철킬레이트와 혼용할 수 있었다. 철 농도가 90 mM 이상인 경우 9 초 이내의 접촉 시간에서 83 % 이상의 $H_2S$가 제거되었다. 따라서 촉매 산화 흡착법은 매립가스 및 바이오가스 정제를 위한 용도로서 충분히 가치가 있는 것으로 판단되었다.

Keywords

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Fig. 1. Schematic diagram of hydrogen sulfide removal utilizing leachate and fe-chelate.

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Fig. 2. Distribution of outlet hydrogen sulphide concentration without pH control.

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Fig. 3. Behavior of outlet hydrogen sulphide concentration during controlled pH by intermittent mixing of NaOH.

Table 1. Landfill Gas Composition in C City Landfill Site

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Table 2. Capability of Hydrogen Sulfide Capture in Continuous Circulation Operation Using Iron Chelating Solvent.

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Table 3. Hydrogen Sulfide Collection Efficiency in Continuous Operation with Leachate and Iron Chelate.

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