The regeneration of EDTA-FeII is a key step in electrobiofilm reduction-integrated systems for NOx removal from industrial boiler flue gas. The current and carbon sources are proposed to be the two crucial electron donors for EDTA-FeII regeneration. These parameters strongly influence the reactivity of EDTA-FeII-generated products in the system. Therefore, their effects on EDTA-FeII-NO and EDTA-FeIII reduction and the EDTA-FeII generation mechanism were studied. The results showed that the electrobiofilm method has obvious advantages over biological or electrochemical methods used alone for EDTA-FeII regeneration. Under the optimal conditions at a current of 22.9A m-3 net cathode chamber, the rate of EDTA-FeII regeneration reached 98.35%. The glucose concentration is the primary factor influencing the reduction of both EDTA-FeII-NO and EDTA-FeIII, while the current significantly promotes both processes. Comparison of the Km values of the two substrates indicated that microbial activity was crucial to the reduction of EDTA-FeII-NO, but the biological reduction of EDTA-FeIII had a competitive influence on EDTA-FeII-NO reduction, which limited the abundance and effectiveness of the bacteria responsible for EDTA-FeII-NO reduction in the electrobiofilm system.

中文翻译：

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电生物膜反应器从模拟烟道气脱硝研究：EDTA-亚铁再生和生物动力学机理。

EDTA-FeII的再生是用于从工业锅炉烟气中去除NOx的电生物膜还原集成系统中的关键步骤。电流和碳源被提议为EDTA-FeII再生的两个至关重要的电子供体。这些参数强烈影响系统中EDTA-FeII生成的产品的反应性。因此，研究了它们对EDTA-FeII-NO和EDTA-FeIII还原的影响以及EDTA-FeII的生成机理。结果表明，电生物膜方法比单独用于EDTA-FeII再生的生物或电化学方法具有明显优势。在最佳条件下，在22.9A m-3净阴极室电流下，EDTA-FeII的再生率达到98.35％。葡萄糖浓度是影响EDTA-FeII-NO和EDTA-FeIII含量降低的主要因素，而目前的潮流极大地促进了这两个过程。两种底物Km值的比较表明，微生物活性对于EDTA-FeII-NO的还原至关重要，但是EDTA-FeIII的生物还原对EDTA-FeII-NO的还原具有竞争性影响，从而限制了其丰度和负责电生物膜系统中EDTA-FeII-NO还原的细菌的有效性。