Enhanced denitrification by graphene oxide–modified cathode for the secondary effluent of wastewater treatment plants in three-dimensional biofilm electrode reactors

Water Science & Technology Pub Date : 2024-06-03 DOI:10.2166/wst.2024.179

Ying Xue, Chaojie Zhang, Sibo Li, Qi Zhou, Xuefei Zhou, Yalei Zhang

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Abstract

In this study, a novel three-dimensional biofilm electrode reactor (3D-BER) with a graphene oxide (GO)–modified cathode was developed to enhance the denitrification performance of secondary effluent from wastewater treatment plants (SEWTPs). The effects of different HRTs and currents on the 3D-BER were explored. The results indicated that at the optimal HRT of 4 h and current of 350 mA/m2, the 3D-BER with GO-modified cathode had a higher denitrification rate (2.40 ± 0.1 mg TN/L/h) and less accumulation of intermediate products, especially with 3.34% TN molar conversion to N2O. The GO-modified cathode offered a large biocompatible specific surface area and enhanced the conductivity, which favored microbial growth and increased electron transfer efficiency and extracellular enzyme activities. Moreover, the activity of nitrite reductase increased more than that of nitrate reductase to accelerate nitrite reduction, thus facilitating the denitrification process. The proposed 3D-BER provided an effective solution to elevate tertiary denitrification in the SEWTP.

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在三维生物膜电极反应器中利用氧化石墨烯改性阴极增强污水处理厂二级出水的脱硝效果

本研究开发了一种新型三维生物膜电极反应器（3D-BER），该反应器采用氧化石墨烯（GO）改性阴极，用于提高污水处理厂（SEWTPs）二级出水的脱硝性能。研究人员探讨了不同的 HRT 和电流对 3D-BER 的影响。结果表明，当最佳 HRT 为 4 小时、电流为 350 mA/m2 时，带有 GO 改性阴极的 3D-BER 具有更高的反硝化率（2.40 ± 0.1 mg TN/L/h）和更少的中间产物积累，尤其是在 TN 摩尔转化为 N2O 的转化率为 3.34% 时。GO 修饰的阴极具有较大的生物相容性比表面积，并增强了导电性，有利于微生物的生长，提高了电子传递效率和细胞外酶活性。此外，亚硝酸盐还原酶的活性比硝酸盐还原酶的活性更高，从而加速了亚硝酸盐的还原，促进了反硝化过程。拟议的 3D-BER 为提高污水处理厂的三级反硝化提供了有效的解决方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Water Science & Technology

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