Fe(Ⅱ)-activated peroxymonosulfate (Fe(Ⅱ)-PMS) oxidation applied to condition excess activated sludge was investigated in this work. The results showed that Fe(Ⅱ)-PMS oxidation could effectively improve sludge dewaterability. The optimal pH and dosages of Fe(Ⅱ) and PMS were 6.7, 60mg/gTSS, and 120mg/gTSS, respectively, under which the standardized-capillary suction time (SCST=CST0/CST) and CST reduction were 11.28 and 91.13%, respectively. Fe(Ⅱ)-PMS oxidation was also favor of sludge solubilization and enhanced stabilization. Under the optimum experimental conditions, VSS reduction was 15.74% and the concentrations of TN and TOC in the supernatant increased 6.21 and 9.13-fold compared to their initial values, respectively. In addition, Fe(Ⅱ)-PMS oxidation was beneficial to destroy and degrade extracellular polymeric substances (EPS) (especially for proteins), which resulted in the release of EPS-bound water and subsequently improved sludge dewaterability significantly.
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