The study proposed the ultrasound-activated persulfate oxidation as a novel approach to enhance sludge dewaterability. The results demonstrated that the reduction of water content of dewatered sludge cake was 16.5% and the capillary suction time was reduced to 39.5 s at the optimal conditions of 1.0 mmol/g-TS S2O2- 8 and ultrasound energy density of 2.0 kW·L^-1 within 15 min. The promotion of dewaterability was closely associated with the enlarged floc size, decreased viscosity, and near-neutral zeta potential. Meanwhile, the correlation analysis revealed that the protein in extracellular polymeric substances (EPS) governed sludge dewaterability, especially in loosely bound EPS. Three-dimensional excitation-emission matrix fluorescence spectroscopy, Fourier transform infrared spectroscopy and scanning electronic microscopy analysis revealed that ultrasound-activated persulfate oxidation treatment effectively degraded the gel-like EPS matrix and attacked cells, releasing the moisture which was trapped in EPS and cells. The aggregation of particles promoted the elimination of moisture. Furthermore, heavy metals in conditioned dewatered sludge cakes all satisfied the A level of agricultural land (GB4284-2018) requirements and the chemical speciation distribution of some heavy metals changed significantly.

该研究提出了超声活化的过硫酸盐氧化法，作为提高污泥脱水能力的一种新方法。结果表明的脱水污泥饼的水含量的降低率为16.5％，并且所述毛细管吸入时间以1.0毫摩尔2.0千瓦·L / g的-TS S2O2- 8和超声能量密度最佳条件降低到39.5小号^{- 1个}15分钟内。脱水能力的提高与絮凝物尺寸的增大，粘度的降低以及接近中性的ζ电势密切相关。同时，相关分析表明，胞外聚合物（EPS）中的蛋白质决定着污泥的脱水能力，尤其是在松散结合的EPS中。三维激发-发射矩阵荧光光谱，傅立叶变换红外光谱和扫描电子显微镜分析表明，超声活化的过硫酸盐氧化处理有效地降解了凝胶状EPS基质并侵蚀了细胞，释放了水分并捕获了EPS和细胞。颗粒的聚集促进了水分的消除。此外，