Sludge management represents a critical challenge because of complex compositions and poor dewaterability. Fe²⁺-activated persulfate oxidation (Fe²⁺/S₂O₈²⁻) is an effective, and widely investigated method for enhancing sludge dewatering. However, the potential effects of Fe²⁺/S₂O₈²⁻ on sludge drying efficiency, anaerobic biodegradation behaviors and potential recycling of sludge residua are not yet well-known. In this study, a new sludge disposal route (step i: enhanced dewatering via Fe²⁺/S₂O₈²⁻, and step ii: drying-incineration or anaerobic digestion) was proposed and appraised comprehensively. Results showed that Fe²⁺/S₂O₈²⁻ oxidation destroyed extracellular polymeric substances, lysed sludge cells and enhanced the dewaterability greatly. Capillary suction time and mechanical filtration time at 2.0/1.6 mmol-Fe²⁺/S₂O₈²⁻/g-VS decreased by 88.0% and 79.6%, respectively. Moreover, 89.8% of micro-pollutants (e.g., methylbenzene, ethylbenzene, p-m-xylene and o-xylene) in sludge were removed. Besides, the pretreatment was able to alter sludge drying behaviors and methane-producing potential. Pretreated sludge exhibited faster drying rate and shorter lag-time for methane production. Incineration residua of dewatered sludge could be re-coupled with S₂O₈²⁻ as the conditioner to enhance sludge dewaterability, thereby reducing the chemical input and disposal cost. This study provides a novel, self-sustainable strategy for sludge management, reutilization and final safe disposal.

由于成分复杂且脱水能力差，污泥管理是一项严峻的挑战。Fe ²⁺活化的过硫酸盐氧化（Fe ²⁺ /S ₂ O ₈ ^2-）是一种有效的、广泛研究的提高污泥脱水的方法。然而，Fe ²⁺ /S ₂ O ₈ ^2-对污泥干燥效率、厌氧生物降解行为和污泥残留物潜在回收利用的潜在影响尚不清楚。在本研究中，一种新的污泥处置路线（步骤 i：通过 Fe ²⁺ /S ₂ O ₈ ²⁻加强脱水），和步骤ii：干燥-焚烧或厌氧消化）被提出和综合评价。结果表明，Fe ²⁺ /S ₂ O ₈ ^2-氧化破坏了胞外聚合物，溶解了污泥细胞，大大提高了脱水能力。毛细管抽吸时间和机械过滤时间在 2.0/1.6 mmol-Fe ²⁺ /S ₂ O ₈ ²⁻ /g-VS 下分别减少了 88.0% 和 79.6%。此外，89.8% 的微量污染物（如甲苯、乙苯、对间二甲苯和邻-二甲苯）被去除。此外，预处理能够改变污泥干燥行为和甲烷产生潜力。预处理的污泥表现出更快的干燥速度和更短的甲烷生产滞后时间。脱水污泥的焚烧残渣可与作为调节剂的S ₂ O ₈ ²⁻重新偶联，以提高污泥的脱水能力，从而降低化学品的投入和处置成本。这项研究为污泥管理、再利用和最终安全处置提供了一种新颖的、自我可持续的策略。