Reduction of Fe(III)EDTA in a NOx scrubber liquor by a denitrifying bacterium and the effects of inorganic sulfur compounds on this process
Reduction of Fe(III)EDTA in a NOx scrubber liquor by a denitrifying bacterium and the effects of inorganic sulfur compounds on this process
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通过反硝化细菌还原 NOx 洗涤液中的 Fe(III)EDTA 以及无机硫化合物对此过程的影响
DOI：
10.1016/j.biortech.2012.06.005
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发表时间：
2012-09-01
影响因子：
11.4
通讯作者：
Chen, Mingxiang
中科院分区：
文献类型：
--
作者：
Dong, Xiyang;Zhang, Yu;Chen, Mingxiang
EDTA铁的生物还原是金属螯合物吸附与微生物还原相结合去除氮氧化物的关键步骤之一。以嗜热副球菌ZGL 1为模型菌，研究了能同时还原Fe（II）EDTA螯合NO（Fe（II）EDTA-NO）和Fe（III）EDTA的微生物对Fe（III）EDTA还原过程的影响。酶谱分析表明，ZGL 1的Fe（III）EDTA还原酶同时存在于细胞膜和细胞质中。葡萄糖被确定为Fe（III）EDTA还原的最有效的电子供体。较好的还原性能，得到较高的初始细胞浓度对应于8.7 μ mol h（-1）mg蛋白质（-1）的特定还原率。硫酸盐和硫代硫酸盐的存在对细胞生长和Fe（III）EDTA还原没有影响。亚硫酸盐的直接和间接毒性作用可抑制Fe（III）EDTA还原速率和细胞生长。(C)2012爱思唯尔有限公司保留所有权利。
Biological reduction of Fe(III)EDTA is one of the key steps in nitrogen oxides removal in the integrated approach of metal chelate absorption combined with microbial reduction. Paracoccus denitrificans ZGL1 was used as a model bacterium to evaluate the process of Fe(III)EDTA reduction by such microorganisms that could carry out the simultaneous reduction of NO chelated by Fe(II)EDTA (Fe(II)EDTA-NO) and Fe(III)EDTA. Enzymes analysis indicated Fe(III)EDTA reductase of ZGL1 was located both in the membrane and cytoplasmic fractions. Glucose was identified as the most efficient electron donor for Fe(III)EDTA reduction. Better reduction performance was obtained with higher initial cell concentration corresponding to a specific reduction rate of 8.7 mu mol h(-1) mg protein(-1). The presence of sulfate and thiosulfate had no influences on both cell growth and Fe(III)EDTA reduction. Fe(III)EDTA reduction rate and cell growth could be inhibited by addition of sulfite mainly due to its direct and indirect toxic effects. (C) 2012 Elsevier Ltd. All rights reserved.