title: Reduction of Fe(III)EDTA by Klebsiella sp. strain FD-3 in NOx scrubber solutions.
abstract: Biological reduction of Fe(III) to Fe(II) is a key step in nitrogen oxides (NOx) removal by the integrated chemical absorption-biological reduction method, which determines the concentration of Fe(II) in the scrubbing liquid. A new Fe(III)EDTA reduction strain, named as FD-3, was isolated from mixed cultures used in the integrated NOx removal process and identified as Klebsiella sp. by 16S rDNA sequence analysis. The reduction abilities of FD-3 and the influence of nitrogen-containing compounds (Fe(II)EDTA-NO, NO3(-) and NO2(-)) and sulfur-containing compounds (SO4(2-), SO3(2-)) on the Fe(III)EDTA reduction were investigated. The results indicated that strain FD-3 could reduce Fe(III)EDTA efficiently. NO3(-), NO2(-) and Fe(II)EDTA-NO inhibit the reduction of Fe(III)EDTA and could also serve as electron acceptor for strain FD-3. SO3(2-) inhibited Fe(III)EDTA reduction while SO4(2-) had no obviously effect on Fe(III)EDTA reduction. The relationship between cell growth and Fe(III)EDTA reduction could be described by the models based on Logistic equation.
authors: Department of Environmental Science & Engineering, Huaqiao University, Xiamen 361021, China. zzm1975@126.com
authors: Zuoming
authors: Z
authors: Zhou
authors: Guohua
authors: G
authors: Jing
authors: Xiangjiao
authors: X
authors: Zheng
mesh_terms: D001709:Biotechnology / Q000379:methods*; D004275:DNA, Ribosomal / Q000235:genetics; D004492:Edetic Acid / Q000378:metabolism; D005290:Ferric Compounds / Q000378:metabolism*; D007709:Klebsiella / Q000235:genetics / Q000378:metabolism*; D008954:Models, Biological; D009589:Nitrogen Oxides / Q000302:isolation & purification* / Q000378:metabolism; D010084:Oxidation-Reduction; D017422:Sequence Analysis, DNA; D013045:Species Specificity; D013056:Spectrophotometry, Ultraviolet
chemical_list: D004275:DNA, Ribosomal; D005290:Ferric Compounds; D009589:Nitrogen Oxides; D004492:Edetic Acid; C019179:Fe(III)-EDTA