Optimization of operating parameters for pyrite-based electrochemical bioreactor using response surface methodology: C/N ratio, current density, and hydraulic retention time

文献类型： 外文期刊

第一作者： Xie, Yufan

作者： Xie, Yufan;Yuan, Sicheng;Wang, Qinglong;Nie, Yuhu;Zhang, Shiyang;Wang, Guangjun;Wang, Weibo

作者机构：

关键词： Pyrite-based electrochemical bioreactor (PEBR); Operating parameter optimization; Response surface methodology

期刊名称：PROCESS BIOCHEMISTRY （ 影响因子：4.0； 五年影响因子：4.2 ）

ISSN： 1359-5113

年卷期： 2025 年 153 卷

页码：

收录情况： SCI

摘要： This study optimized three important influence factors of C/N ratio, current density (CD), and hydraulic retention time (HRT) using Box-Behnken design and response surface methodology (RSM) for a pyrite-based electrochemical bioreactor (PEBR). Meanwhile, the interactive effects among these factors were investigated. Under the optimal conditions, the NO3 --N removal efficiency (NRE) peaked at 95.61 % at an HRT of 12 h, a CD of 483 mA/m2, and a C/N ratio of 3.55. Among these factors, the C/N ratio was identified as the most influential factor affecting NRE. Under the optimal conditions, Proteobacteria (43.36 %), Campylobacterota (11.14 %), Bacteroidota (8.00 %), and Desulfobacterota (11.36 %) were the dominant phyla, while Sulfurimonas (7.19 %), Acetobacterium (7.11 %) and Desulfovibrio (7.11 %) became the dominant genera. In addition, the relative abundance of functional genes for sulfur metabolism was enhanced obviously after the operating parameter optimization. These findings can help PEBR achieve high efficiency and low energy consumption for nitrate removal.

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