Re-acclimation performance and microbial characteristics of a thermophilic biofilter for NOx removal from flue gas

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• 作者：Shihan Zhang ; Han Chen ; Yinfeng Xia ; Jingkai Zhao…
• 关键词：NOx removal ; CABR ; Re ; acclimation ; Flue gas ; Microbial community
• 刊名：Applied Microbiology and Biotechnology
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：99
• 期：16
• 页码：6879-6887
• 全文大小：457 KB
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• 作者单位：Shihan Zhang (1) (2) (3)
  Han Chen (2)
  Yinfeng Xia (1) (2)
  Jingkai Zhao (1)
  Nan Liu (1)
  Wei Li (1) (2)
  
  1. Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University, Yuquan Campus, Hangzhou, 310027, China
  2. Institute of Environmental Engineering, Zhejiang University, Zijingang Campus, Hangzhou, 310058, China
  3. Illinois State Geological Survey, University of Illinois at Urbana-Champaign, Champaign, IL, USA
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  Microbiology
  Microbial Genetics and Genomics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0614

文摘

Currently, a novel chemical absorption-biological reduction (CABR) integrated process, employing Fe(II)EDTA as a solvent, is being under development to reduce the cost of NOx removal from flue gas. In this work, the NO removal profile, re-acclimation performance, and microbial characteristics in a thermophilic biofilter were investigated at the conditions typical to CABR process. The biofilter comprised of four layers of packing material with a surface area of 1200?m2?m?. Experimental results revealed that the biofilter could remove 95?% of the fed NO at typical flue gas conditions. As the gas residence time varied from 90 to 15?s, the NO removal efficiency decreased from 100 to 56.5?% due to the NO mass transfer limitation. The longer period of the biofilter shutdown required more time for its re-acclimation. For example, after 8-day shutdown, the biofilter was re-acclimated in 32?h. Denaturing gradient gel electrophoresis analysis of PCR-amplified product showed that Pseudomonas, a group of denitrifier, was dominant in the biofilter. Because the Pseudomonas was abundant at the bottom layer of packed-bed, the bottom layer contributed to 60-0?% of the total NO removal. In addition, Pseudomonas gradually faded away along the gas flow path from the bottom to the top of biofilter, resulting in a significant decrease in NO removal at the other three packed-bed layers. These observed results will provide the process engineering and scale-up data with respect to the biofilter operations to help advance the CABR process to pilot-scale testing.