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Biological Reduction of Nitric Oxide in Aqueous Fe(II)EDTA Solutions
Author(s) -
Maas Peter van der,
Van de Sandt Thomas,
Klapwijk Bram,
Lens Piet
Publication year - 2008
Publication title -
biotechnology progress
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.572
H-Index - 129
eISSN - 1520-6033
pISSN - 8756-7938
DOI - 10.1021/bp030008n
Subject(s) - chemistry , aqueous solution , denitrification , chelation , inorganic chemistry , denitrifying bacteria , ethanol , nitric oxide , nuclear chemistry , redox , nitrogen , organic chemistry
The reduction of nitric oxide (NO) in aqueous solutions of Fe(II)EDTA is one of the core processes in BioDeNOx, an integrated physicochemical and biological technique for NO x removal from industrial flue gases. NO reduction in aqueous solutions of Fe(II)EDTA (20–25 mM, pH 7.2 ± 0.2) was investigated in batch experiments at 55 °C. Reduction of NO to N 2 was found to be biologically catalyzed with nitrous oxide (N 2 O) as an intermediate. Various sludges from full‐scale denitrifying and anaerobic reactors were capable to catalyze NO reduction under thermophilic conditions. The NO reduction rate was not affected by the presence of ethanol or acetate. EDTA‐chelated Fe(II) was found to be a suitable electron donor for the biological reduction of nitric oxide to N 2 , with the concomitant formation of Fe(III)EDTA. In the presence of ethanol, EDTA‐chelated Fe(III) was reduced to Fe(II)EDTA. This study strongly indicates that redox cycling of FeEDTA plays an important role in the biological denitrification process within the BioDeNOx concept.