Enhanced biological removal of NO x from flue gas in a biofilter by Fe(II)Cit/Fe(II)EDTA absorption

Bi Hong Lu, Yan Jiang, Ling Lin Cai, Nan Liu, Shi Hang Zhang, Wei Li

Research output: Contribution to journalArticlepeer-review


A mixed absorbent had been proposed to enhance the chemical absorption-biological reduction process for NO x removal from flue gas. The mole ratio of the absorbent of Fe(II)Cit to Fe(II)EDTA was selected to be 3. After the biofilm was formed adequately, some influential factors, such as the concentration of NO, O 2, SO 2 and EBRT were investigated. During the long-term running, the system could keep on a steady NO removal efficiency (up to 90%) and had a flexibility in the sudden changes of operating conditions when the simulated flue gas contained 100-500ppm NO, 100-800ppm SO 2, 1-5% (v/v) O 2, and 15% (v/v) CO 2. However, high NO concentration (>800ppm) and relative short EBRT (<100s) had significant negative effect on NO removal. The results indicate that the new system by using mixed-absorbent can reduce operating costs in comparison with the single Fe(II)EDTA system and possesses great potential for scale-up to industrial applications.

Original languageEnglish (US)
Pages (from-to)7707-7712
Number of pages6
JournalBioresource Technology
Issue number17
StatePublished - Sep 2011
Externally publishedYes


  • CABR
  • Citrate
  • EDTA
  • Iron reduction
  • NO

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal


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