This study investigated electrooxidation (EO) pretreatment for sludge dewatering wastewater and condensate generated during the process, aiming to enhance its treatment via a membrane bioreactor (MBR) and prevent membrane fouling. EO treatment could achieve a complete suspended solids (SS) removal along with 97.4 % EPS and 90.1 % colour removal under the optimum conditions. However, the NH4+-N and total organic carbon (TOC) concentration in wastewater increased (16 % and 72.8 %, respectively) due to break down of the complex organic substances present in the wastewater. MBR treating EO pretreated wastewater showed significant improvement against membrane fouling, as shown by reduction in transmembrane pressure (TMP) from 15 kPa in control to 0 kPa in the experimental reactor. The MBR operated with EO-treated wastewater and a 16-day HRT resulted in a low effluent NH4+-N concentrations of 469.3 mg/L (74.9 % removal) along with a very low TOC concentration of 24.3 mg/L (98.7 % removal). The microbial community analysis revealed that enrichment of selected organic carbon degraders (Defluviitoga, Pedobacter, and Flavobacteriaceae) and nitrogen cycle bacteria (Dechloromonas, Comamonas, Arenibacter, Brevundimonas, Thauera, and Aequorivita), including some aerobic denitrifiers (Aquamicrobium and Chryseobacterium) in the experimental reactor treating EO-pretreated wastewater is responsible for enhancing microbial degradation and its overall performance.

中文翻译：

---

电氧化预处理对处理污泥脱水废水的膜生物反应器处理效率、膜污染和微生物群落的影响


本研究调查了污泥脱水废水和过程中产生的冷凝水的电氧化 （EO） 预处理，旨在通过膜生物反应器 （MBR） 加强其处理并防止膜污染。在最佳条件下，EO 处理可以实现完全去除悬浮物 （SS） 以及 97.4% 的 EPS 和 90.1% 的色素去除。然而，由于废水中存在的复杂有机物质的分解，废水中的 NH4+-N 和总有机碳 （TOC） 浓度增加了（分别为 16% 和 72.8%）。MBR 处理 EO 预处理的废水显示出对膜污染的显著改善，如实验反应器中的跨膜压力 （TMP） 从对照的 15 kPa 降低到 0 kPa 所示。MBR 使用经过 EO 处理的废水运行，16 天的 HRT 导致出水 NH4+-N 浓度低至 469.3 mg/L（去除 74.9%），TOC 浓度非常低，为 24.3 mg/L（去除 98.7%）。微生物群落分析显示，选定的有机碳降解剂（Defluviitoga、Pedobacter 和 Flavobacteriaceae）和氮循环细菌（Dechloromonas、Comamonas、Arenibacter、Brevundimonas、Thauera 和 Aequorivita），包括一些好氧反氮化剂（Aquamicrobium 和 Chryseobacterium）在处理 EO 预处理废水的实验反应器中富集负责增强微生物降解及其整体性能。