China Key Laboratory of Light Industry Pollution Control and Recycling, Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, 450001, People's Republic of China.
Solid Waste and Chemicals Management Center, Ministry of Ecology and Environment of the People's Republic of China, Beijing, 100029, People's Republic of China.
Environ Sci Pollut Res Int. 2021 Jan;28(3):2860-2870. doi: 10.1007/s11356-020-10617-2. Epub 2020 Sep 7.
The regeneration of EDTA-Fe is a key step in electrobiofilm reduction-integrated systems for NO removal from industrial boiler flue gas. The current and carbon sources are proposed to be the two crucial electron donors for EDTA-Fe regeneration. These parameters strongly influence the reactivity of EDTA-Fe-generated products in the system. Therefore, their effects on EDTA-Fe-NO and EDTA-Fe reduction and the EDTA-Fe generation mechanism were studied. The results showed that the electrobiofilm method has obvious advantages over biological or electrochemical methods used alone for EDTA-Fe regeneration. Under the optimal conditions at a current of 22.9A m net cathode chamber, the rate of EDTA-Fe regeneration reached 98.35%. The glucose concentration is the primary factor influencing the reduction of both EDTA-Fe-NO and EDTA-Fe, while the current significantly promotes both processes. Comparison of the K values of the two substrates indicated that microbial activity was crucial to the reduction of EDTA-Fe-NO, but the biological reduction of EDTA-Fe had a competitive influence on EDTA-Fe-NO reduction, which limited the abundance and effectiveness of the bacteria responsible for EDTA-Fe-NO reduction in the electrobiofilm system.
EDTA-Fe 的再生是电生物膜还原集成系统去除工业锅炉烟气中 NO 的关键步骤。目前和碳源被提议为 EDTA-Fe 再生的两个关键电子供体。这些参数强烈影响系统中 EDTA-Fe 生成产物的反应性。因此，研究了它们对 EDTA-Fe-NO 和 EDTA-Fe 还原的影响以及 EDTA-Fe 的生成机制。结果表明，与单独使用生物或电化学方法相比，电生物膜方法在 EDTA-Fe 再生方面具有明显的优势。在电流为 22.9A m 网阴极室的最佳条件下，EDTA-Fe 的再生速率达到 98.35%。葡萄糖浓度是影响 EDTA-Fe-NO 和 EDTA-Fe 还原的主要因素，而电流则显著促进了这两个过程。两种底物的 K 值比较表明，微生物活性对 EDTA-Fe-NO 的还原至关重要，但 EDTA-Fe 的生物还原对 EDTA-Fe-NO 还原具有竞争影响，这限制了电生物膜系统中负责 EDTA-Fe-NO 还原的细菌的丰度和有效性。
