Acidithiobacillus ferrooxidans를 고정화한 생물반응기와 흡수탑을 이용한 고농도 황하수소 제거
Removal of High Strength Hydrogen Sulfide Gas using a Bioreactor Immobilized with Acidithiobacillus ferrooxidans and a Chemical Absorption Scrubber.
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초록
고농도의 황화수소 가스를 제거하기 위하여 철촉매인 Fe3+을 생산할 수 있는 철산화 세균 A. ferrooxidans를 다공성 세라믹 담체에 고정화한 생물반응기와 황화수소가 Fe3+와 화학반응에 의해 elemental sulfur로 제거되는 흡수탑 반응기로 구성된 2단계 생물학적 탈황공정을 연구하였다. 생물반응기는 4회 이상의 반복 회분식 배양을 통해 안정화 되었고, 정상상태에서의 평균 철산화 속도는 0.89 kg . m-3 . h-1 이었다. 2단계 생물 탈황공정은 약 54일 동안 장기간 성공적으로 조업이 가능하였다. 흡수탑 반응기에서는 공간속도를 70 h-1의 조건하에서 37,000 ppm의 고농도 H2S까지도 97-99% 이상의 높은 제거효율을 얻을 수 있었고, H2S 제거 임계 부하량은 3.3 kg S . m-3 . h-1로 우수하였다. 장기간 조업하는 동안 고정화 세포의 농도는 일정하게 유지되었다.
Abstract
To treat a waste gas containing a high strength H2S, the two-stages microbial desulfurization process that consisted of a bioreactor immobilized with Acidithiobacillus ferrooxidans and a chemical absorption scrubber has was proposed. After 4 times repeat of batch cultures, the immobilized bioreactor has been stabilized and the rate of iron oxidation reached 0.89 kg . m-3 . h-1 at steady state. The two-stages microbial desulfurization process was able to be operated for a long term over 54 days. The removal efficiencies of H2S were 97-99% at a space velocity of 70 h-1 and a inlet concentration of 37,000 ppmv. The maximum elimination capacity of H2S was approximately 3.3 kg S . m-3 . h-1. In the bioractor, the concentrations of the Fe3+ and the immobilzed cell were constantly maintained during the desulfurization.
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