화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Applied Chemistry for Engineering, Vol.21, No.3, 243-251, June, 2010
Export Citation
연소배가스 중 질소산화물(NOx) 제거를 위한 생물학적 기술
Biological Removal of Nitrogen Oxides from Combustion Flue Gases
이기세†
  • 명지대학교 환경생명공학과
Kisay Lee†
  • Department of Environmental Engineering and Biotechnology, Myongji University, Gyongki 449-728, Korea
E-mail:
초록
연소배가스에 존재하는 질소산화물의 제거를 위해서는 촉매 환원, 흡수, 흡착 등 화학적 기술이 적용되고 있는데, 장기적으로는 환경친화적이고 에너지 소모가 적은 생물학적 공정의 개발 및 이용이 필요하다. 본 논문에서는 연소 배가스에 존재하는 질소산화물을 제거하기 위한 생물학적 공정의 기술동향을 살펴보고 각각의 장단점을 고찰하였다. 질산화와 탈질 기작을 이용하는 박테리아 시스템과 광합성 미세조류를 이용하는 시스템으로 구분하여 기술의 원리와 현재의 기술 수준을 논하였다. 두 경우 모두 처리속도를 높이기 위해서는 불용성의 일산화질소를 일단 적절한 흡수제에 고농도로 포집시킨 후 미생물에 의하여 분해 또는 고정하는 방향이 바람직하며, 배가스 중 CO2와 NOx를 동시에 고정이 가능하고 별도의 탄소원이 요구되지 않는 미세조류의 활용이 기대된다.
Nitrogen oxides (NOx) in combustion flue gas are currently mitigated by chemical processes such as catalytic reduction, absorption and adsorption. However, development of environmentally sustainable biological processes is necessary in the near future. In this paper, the up-to-dated R&D trend of biological methodologies regarding NOx removal was reviewed, and their advantages and disadvantages were discussed. The principles and applications of bacterial system including nitrification and denitrification and photosynthetic microalgae system were compared. In order to enhance biological treatment rate and performance, the insoluble nitric oxide (NO) should be first absorbed using a proper solubilization agent, and then microbial degradation or fixation is to be followed. The use of microalgal system has a good prospect because it can fix CO2 and NOx simultaneously and requires no additional carbon for energy source.
Keywords:flue gas;nitrogen oxides;nitric oxide;biological removal;microalgae;Fe(II)EDTA
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