Institute of Environmental Engineering, Zhejiang University (Yuquan Campus), Hangzhou, China.
Bioresour Technol. 2011 Feb;102(3):2605-9. doi: 10.1016/j.biortech.2010.10.012. Epub 2010 Oct 8.
A chemical absorption-biological reduction integrated process has been proposed for the removal of nitrogen oxides (NO(x)) from flue gases. In this study, we report a new approach using biofilm electrode reactor (BER) to regenerate Fe(II)EDTA via simultaneously reducing Fe(II)EDTA-NO and Fe(III)EDTA in NO(x) scrubber solution. Biofilm formed on the surface of the cathode was confirmed by Environmental Scan Electro-Microscope. Experimental results demonstrated that it was effective and feasible to utilize the BER to promote the reduction of Fe(II)EDTA-NO and Fe(III)EDTA simultaneously. The reduction efficiency of Fe(II)EDTA-NO and Fe(III)EDTA was up to 85% and 78%, respectively when the BER was continuously operated with electricity current at 30 mA. The absence of electricity induced an immediate decrease in reduction efficiency, indicating that the bio-regeneration of ferrous chelate complex was electrochemically accelerated. The present approach is considered advantageous for the enhanced bio-reduction in the NO(x) scrubber solution.
一种化学吸收-生物还原集成工艺已被提出用于从烟道气中去除氮氧化物（NOx）。在本研究中，我们报告了一种使用生物膜电极反应器（BER）的新方法，通过同时还原 NOx 洗涤液中的 Fe(II)EDTA-NO 和 Fe(III)EDTA 来再生 Fe(II)EDTA。阴极表面形成的生物膜通过环境扫描电子显微镜得到证实。实验结果表明，利用 BER 有效地促进了 Fe(II)EDTA-NO 和 Fe(III)EDTA 的同时还原。当 BER 以 30 mA 的电流连续运行时，Fe(II)EDTA-NO 和 Fe(III)EDTA 的还原效率分别高达 85%和 78%。没有电流会导致还原效率立即下降，这表明亚铁螯合物的生物再生是通过电化学加速的。本方法被认为有利于增强 NOx 洗涤液中的生物还原。
