In this work, ultrasound (US) assisted zero-valent iron (ZVI)-activated peroxymonosulfate (PMS) oxidation was used to improve the dewaterability of aerobically digested sludge (AeDS). Capillary suction time (CST) reduction, centrifuged weight reduction (CWR), and water content of sludge cake (Wc) were determined to evaluate AeDS dewaterability. The results showed that the optimal reaction time, PMS dosage, ZVI dosage, and US power were 20 min, 50 mg/g total solids (TS), 100 mg/g TS, and 50 W, respectively. Under the optimum conditions, CST reduction, Wc, and CWR were 89.2%, 67.9%, and 40.4%, respectively. The quenching experiments showed that sulfate radical was the dominant radical species in the US-ZVI-PMS system while hydroxyl radical in the ZVI-PMS system. Compared to ZVI-PMS treatment, US-ZVI-PMS treatment was more conducive to improve sludge dewaterability, suggesting that US assistance destructed the passive film of ZVI and accelerated its corrosion, consequently resulting in more production of sulfate radical. The significant degradation of tightly bound extracellular polymeric substances (EPS) of AeDS after US-ZVI-PMS treatment led to the releases of EPS bound water and even the intracellular water, consequently improving AeDS dewaterability. Additionally, US-ZVI-PMS treatment presented the advantages of sludge disintegration and charge neutralization. The ZVI cycle tests demonstrated that the reusability and stability of the recovered ZVI in the US-ZVI-PMS system were desirable, leading to the cost savings.

在这项工作中，超声（美国）辅助的零价铁（ZVI）活化的过氧单硫酸盐（PMS）氧化被用来提高需氧消化污泥（AeDS）的脱水能力。测定毛细管抽吸时间（CST）减少，离心重量减少（CWR）和污泥饼中的水分含量（Wc）以评估AeDS的脱水性。结果表明，最佳反应时间，PMS剂量，ZVI剂量和US power分别为20分钟，50 mg / g总固体（TS），100 mg / g TS和50W。在最佳条件下，CST降低，Wc和CWR分别为89.2％，67.9％和40.4％。淬灭实验表明，硫酸根是US-ZVI-PMS系统中的主要自由基，而羟基则是ZVI-PMS系统中的主要自由基。与ZVI-PMS处理相比，US-ZVI-PMS处理更有利于改善污泥的脱水性，这表明美国的援助破坏了ZVI的钝化膜并加速了其腐蚀，因此导致了更多的硫酸根产生。US-ZVI-PMS处理后，AeDS的紧密结合的胞外聚合物（EPS）的显着降解导致EPS结合水甚至细胞内水的释放，从而提高了AeDS的脱水性。此外，US-ZVI-PMS处理具有污泥分解和电荷中和的优势。ZVI循环测试表明，在US-ZVI-PMS系统中回收的ZVI的可重用性和稳定性是可取的，从而节省了成本。因此导致更多的硫酸根产生。US-ZVI-PMS处理后，AeDS的紧密结合的胞外聚合物（EPS）的显着降解导致EPS结合水甚至细胞内水的释放，从而提高了AeDS的脱水性。此外，US-ZVI-PMS处理具有污泥分解和电荷中和的优势。ZVI循环测试表明，在US-ZVI-PMS系统中回收的ZVI的可重用性和稳定性是可取的，从而节省了成本。因此导致产生更多的硫酸根。US-ZVI-PMS处理后，AeDS的紧密结合的胞外聚合物（EPS）的显着降解导致EPS结合水甚至细胞内水的释放，从而提高了AeDS的脱水性。此外，US-ZVI-PMS处理具有污泥分解和电荷中和的优势。ZVI循环测试表明，在US-ZVI-PMS系统中回收的ZVI的可重用性和稳定性是可取的，从而节省了成本。因此提高了AeDS的脱水能力。此外，US-ZVI-PMS处理具有污泥分解和电荷中和的优势。ZVI循环测试表明，在US-ZVI-PMS系统中回收的ZVI的可重用性和稳定性是可取的，从而节省了成本。因此提高了AeDS的脱水能力。此外，US-ZVI-PMS处理具有污泥分解和电荷中和的优势。ZVI循环测试表明，在US-ZVI-PMS系统中回收的ZVI的可重用性和稳定性是可取的，从而节省了成本。