title: Fe(III)EDTA and Fe(II)EDTA-NO reduction by a sulfate reducing bacterium in NO and SO₂ scrubbing liquor.
abstract: A viable process concept, based on NO and SO2 absorption into an alkaline Fe(II)EDTA (EDTA: ethylenediaminetetraacetic acid) solution in a scrubber combined with biological reduction of the absorbed SO2 utilizing sulfate reducing bacteria (SRB) and regeneration of the scrubbing liquor in a single bioreactor, was developed. The SRB, Desulfovibrio sp. CMX, was used and its sulfate reduction performances in FeEDTA solutions and Fe(II)EDTA-NO had been investigated. In this study, the detailed regeneration process of Fe(II)EDTA solution, which contained Fe(III)EDTA and Fe(II)EDTA-NO reduction processes in presence of D. sp. CMX and sulfate, was evaluated. Fe(III)EDTA and Fe(II)EDTA-NO reduction processes were primarily biological, even if Fe(III)EDTA and Fe(II)EDTA-NO could also be chemically convert to Fe(II)EDTA by biogenic sulfide. Regardless presence or absence of sulfate, more than 87 % Fe(III)EDTA and 98 % Fe(II)EDTA-NO were reduced in 46 h, respectively. Sulfate and Fe(III)EDTA had no affection on Fe(II)EDTA-NO reduction. Sulfate enhanced final Fe(III)EDTA reduction. Effect of Fe(III)EDTA on Fe(II)EDTA-NO reduction rate was more obvious than effect of sulfate on Fe(II)EDTA-NO reduction rate before 8 h. To overcome toxicity of Fe(II)EDTA-NO on SRB, Fe(II)EDTA-NO was reduced first and the reduction of Fe(III)EDTA and sulfate occurred after 2 h. First-order Fe(II)EDTA-NO reduction rate and zero-order Fe(III)EDTA reduction rate were detected respectively before 8 h.
authors: Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian, 116024, People's Republic of China.
authors: Mingxiang
authors: M
authors: Chen
authors: Jiti
authors: J
authors: Zhou
authors: Yu
authors: Y
authors: Zhang
authors: Xiaojun
authors: X
authors: Wang
authors: Zhuang
authors: Z
authors: Shi
authors: Xiaowei
authors: X
authors: Wang
mesh_terms: D000393:Air Pollutants / Q000378:metabolism / Q000633:toxicity; D019149:Bioreactors / Q000382:microbiology; D001711:Biotransformation; D003901:Desulfovibrio / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D004492:Edetic Acid / Q000378:metabolism*; D005290:Ferric Compounds / Q000378:metabolism*; D005296:Ferrous Compounds / Q000378:metabolism*; D009569:Nitric Oxide / Q000378:metabolism* / Q000633:toxicity; D010084:Oxidation-Reduction; D013431:Sulfates / Q000378:metabolism; D013458:Sulfur Dioxide / Q000378:metabolism*; D013997:Time Factors
chemical_list: D000393:Air Pollutants; D005290:Ferric Compounds; D005296:Ferrous Compounds; D013431:Sulfates; D013458:Sulfur Dioxide; C055526:Fe(II)-EDTA; D009569:Nitric Oxide; D004492:Edetic Acid; C019179:Fe(III)-EDTA
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