Simultaneous removal of polycyclic aromatic hydrocarbons (PAHs) in the process of enhancement of sludge dewaterability via oxidation of hydroxyl radicals (•OH) and flocculation of Fe³⁺ by Fe²⁺-catalyzing O₃ were investigated as a novel research focus. The results showed that capillary suction time (CST) and water content of dewatered sludge cake (Wc) were reduced from 57.9 s and 85.1% to 13.6 s and 69.65% under the optimum usage of 60 mg/g dry solids (DS) O₃ and 80 mg/g DS FeSO₄, respectively. The relevant dewatering mechanism of Fe²⁺-catalyzing O₃ treatment was elucidated. It was found that extracellular polymeric substances-bound (EPS-bound) and intracellular water was dramatically released through destroying sludge cells and EPS gel-like structure by produced •OH. In addition, the results of X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) and ¹³C NMR spectroscopy revealed that •OH oxidized and mineralized hydrophilic organic matters intensifying hydrophobicity of sludge surface. Moreover, Fe³⁺ generated by oxidation of Fe²⁺ agglomerated fragmented fine particles into large aggregates and decreased exposure of hydrophilic sites by neutralizing negative charge, which promoted water-solids separation. Meanwhile, sludge surface roughness was decreased which was determined by material type upright confocal laser microscope (CLM). As a consequence, •OH and Fe³⁺ were mainly responsible for enhancement of sludge dewaterability. Moreover, more than 40% of removal rate of PAHs was accomplished by Fe²⁺-catalyzed O₃ treatment mitigating the environmental risks of PAHs spread.

作为新的研究热点，研究了通过羟基自由基(•OH)的氧化和Fe ²⁺催化O _3絮凝Fe ³⁺提高污泥脱水能力的同时去除多环芳烃(PAHs) 。_{结果表明，在60 mg/g干固体（DS）O 3}的最佳用量下，毛细抽吸时间（CST）和脱水污泥饼的含水量（Wc）由57.9 s和85.1%降低到13.6 s和69.65%。和 80 mg/g DS FeSO ₄，分别。^{Fe 2+}催化O ₃的相关脱水机理治疗被阐明。研究发现，通过产生•OH破坏污泥细胞和EPS凝胶状结构，细胞外聚合物结合（EPS-bound）和细胞内水被显着释放。此外，X射线光电子能谱(XPS)、傅里叶变换红外(FTIR)和¹³ C NMR光谱结果表明，•OH氧化和矿化了亲水性有机物，增强了污泥表面的疏水性。此外， Fe ²⁺氧化生成的 Fe ³⁺将破碎的细颗粒凝聚成大的聚集体，通过中和负电荷减少亲水位点的暴露，从而促进水-固体分离。同时，通过材料类型立式共聚焦激光显微镜（CLM）测定污泥表面粗糙度降低。结果，•OH 和Fe ³⁺主要负责提高污泥的脱水能力。^{此外，通过 Fe 2+}催化的 O ₃处理实现了 40% 以上的 PAHs 去除率，从而减轻了 PAHs 扩散的环境风险。