Department of Environmental Engineering, Zhejiang University (Yuquan Campus), Hangzhou, China.
Bioresour Technol. 2011 Feb;102(3):3049-54. doi: 10.1016/j.biortech.2010.10.036. Epub 2010 Oct 14.
Biological reduction of Fe(III) to Fe(II) is a key step in nitrogen oxide (NO(x)) removal by the integrated chemical absorption-biological reduction process. NO(x) removal efficiency strongly depends on the concentration of Fe(II) in the scrubbing liquid. In this study, a newly isolated strain, Enterococcus sp. FR-3, was used to reduce Fe(III) chelated with citrate to Fe(II). Strain FR-3 reduced citrate-chelated Fe(III) with an efficiency of up to 86.9% and an average reduction rate of 0.21 mM h(-1). SO(4)(2-) was not inhibitory whereas NO(2)(-) and SO(3)(2-) inhibited cell growth and thus affected Fe(III) reduction. Models based on the Logistic equation were used to describe the relationship between growth and Fe(III) reduction. These findings provide some useful data for Fe(III) reduction, scrubber solution regeneration and NO(x) removal process design.
生物还原 Fe(III) 为 Fe(II) 是集成化学吸收-生物还原工艺去除氮氧化物 (NO(x)) 的关键步骤。NO(x) 去除效率强烈依赖于洗涤液中 Fe(II) 的浓度。在这项研究中，使用新分离的肠球菌属 FR-3 菌株将与柠檬酸螯合的 Fe(III)还原为 Fe(II)。FR-3 菌株以高达 86.9%的效率和 0.21mM h(-1)的平均还原率还原柠檬酸螯合的 Fe(III)。SO(4)(2-) 没有抑制作用，而 NO(2)(-) 和 SO(3)(2-) 抑制细胞生长，从而影响 Fe(III)还原。基于 Logistic 方程的模型用于描述生长与 Fe(III)还原之间的关系。这些发现为 Fe(III)还原、洗涤液再生和 NO(x)去除工艺设计提供了一些有用的数据。
