title: Enhanced biological removal of NOχ from flue gas in a biofilter by Fe(II)Cit/Fe(II)EDTA absorption.
abstract: 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 100-500 ppm NO, 100-800 ppm SO(2), 1-5% (v/v) O(2), and 15% (v/v) CO(2). However, high NO concentration (>800 ppm) 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.
authors.affiliation: Institute of Environmental Engineering, Zhejiang University (Zijingang Campus), Hangzhou 310058, China.
authors.forename: Bi-Hong
authors.initials: BH
authors.lastname: Lu
authors.forename: Yan
authors.initials: Y
authors.lastname: Jiang
authors.forename: Ling-Lin
authors.initials: LL
authors.lastname: Cai
authors.forename: Nan
authors.initials: N
authors.lastname: Liu
authors.forename: Shi-Hang
authors.initials: SH
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Li
mesh_terms: D000327:Adsorption; D019343:Citric Acid; D004492:Edetic Acid / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry*; D005374:Filtration / Q000379:methods*; D005740:Gases / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D009589:Nitrogen Oxides / Q000302:isolation & purification*
chemical_list: D005296:Ferrous Compounds; D005740:Gases; D009589:Nitrogen Oxides; D019343:Citric Acid; C016600:ferrous citrate; D004492:Edetic Acid