The feasibility of using Fe⁰/S₂O₈²⁻ conditioning (zero valence iron (ZVI)/persulfate (ps)) integrated with horizontal electro-dewatering (HED) to improve the dewaterability of activated sludge (AS) was evaluated. The removal and migration of free and bound water in the ZVI/ps–HED process were determined, along with the organic matter migration between the solid and liquid phases of AS biosolids. Results showed that the optimum conditioning dosages were determined as 0.35 g ZVI/g dry solids (DS) and 0.15 g ps/g DS on the basis of capillary suction time variation. The lowest final water content (WC) of 83.67% in AS occurred after the HED treatment at 40 V and 120 min as determined using the response surface methodology. Despite the disruption of AS flocs and microbial cells through ${\text{SO}}_4^{-·}$ oxidation during the ZVI/ps conditioning, the particle size and mass fractal dimension of the AS flocs remained relatively stable as the zeta potential increased from −8.5 mV to −4.6 mV. The coagulation of Fe³⁺ from the oxidation of Fe²⁺ by ps contributed to the relatively stable condition, which favored the subsequent momentum of the electroosmotic flow. Moreover, the ZVI/ps conditioning decreased the bound water content (BWC, from 1.83 g/g DS to 1.38 g/g DS) and increased the free water content (FWC, from 60.27 g/g DS to 60.91 g/g DS), indicating a transformation from free water to bound water. After the ZVI/ps–HED process, the FWC and BWC were removed significantly with ratios of 96.32% and 79.78%, respectively. Along with water removal through the ZVI/ps–HED process, the organic matter in the supernatant/filtrate initially increased and further rose at the HED stage. The analysis of the extracellular polymeric substance (EPS) content showed that the proteins (PNs) and polysaccharides (PSs) at the liquid and solid phases decreased due to oxidative degradation. Furthermore, the ZVI/ps stage significantly reduced the PNs content of slime to 57.22%, the PSs content of EPS to 68.50%, and the PN-like substances in the slime and tightly bound EPS to 74.90% and 52.47%, respectively. In addition, the WC of AS correlated with the contents of PN and microbial by-product-like material in slime, as well as tryptophan in TB-EPS, and the low EPS content in AS indicated good dewaterability. Thus, ZVI/ps should be selected as a pretreatment prior to HED.

使用Fe ⁰ / S ₂ O ₈ ^2-的可行性评估了与水平电脱水（HED）集成以改善活性污泥（AS）脱水能力的调节（零价铁（ZVI）/过硫酸盐（ps））。确定了ZVI / ps-HED过程中游离水和结合水的去除和迁移，以及AS生物固体的固相和液相之间的有机物迁移。结果表明，根据毛细管抽吸时间的变化，最佳调理剂量确定为0.35 g ZVI / g干固体（DS）和0.15 g ps / g DS。使用响应表面方法确定，在40 V和120分钟的HED处理后，AS中的最低最终水分含量（WC）为83.67％。尽管AS絮凝物和微生物细胞通过${\text{所以}}_4^{-·}$在ZVI / ps调节过程中发生氧化时，随着Zeta电位从-8.5 mV增大到-4.6 mV，AS絮凝物的粒径和质量分形维数保持相对稳定。Fe ²⁺的氧化作用导致Fe ³⁺的凝结ps导致相对稳定的状态，这有利于随后的电渗流动量。此外，ZVI / ps调理降低了结合水含量（BWC，从1.83 g / g DS增至1.38 g / g DS）并增加了游离水含量（FWC，从60.27 g / g DS增至60.91 g / g DS） ，表示从自由水到结合水的转变。ZVI / ps-HED处理后，FWC和BWC的去除率分别为96.32％和79.78％。随着通过ZVI / ps-HED工艺去除水，上清液/滤液中的有机物最初增加，并在HED阶段进一步上升。对细胞外聚合物质（EPS）含量的分析表明，液相和固相中的蛋白质（PNs）和多糖（PSs）由于氧化降解而降低。此外，ZVI / ps阶段显着降低了粘液中PNs含量至57.22％，EPS中PSs含量至68.50％，粘液中EPS和紧密结合EPS中的PN类物质分别降至74.90％和52.47％。此外，AS的WC与粘液中PN和微生物副产物样物质的含量以及TB-EPS中的色氨酸相关，而AS中较低的EPS含量表明其具有良好的脱水性。因此，应选择ZVI / ps作为HED之前的预处理。AS中EPS含量低表明其具有良好的脱水性。因此，应选择ZVI / ps作为HED之前的预处理。AS中EPS含量低表明其具有良好的脱水性。因此，应选择ZVI / ps作为HED之前的预处理。