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Sulfate Radicals: A New Tool for Enhancing Sludge Dewatering
Yue Lai, Chao Wang, Jie Zhang, Shungui Zhou, Changgeng Liu, Jie Ye
Prog Chem ›› 2024, Vol. 36 ›› Issue (5) : 798-814.
PDF(10027 KB)
PDF(10027 KB)
Sulfate Radicals: A New Tool for Enhancing Sludge Dewatering
sludge is an inevitable by-product of the wastewater treatment process and due to its high water content,large volume,and inclusion of a large amount of toxic and hazardous substances,needs to be minimized and harmlessly treated.However,sludge possesses extracellular polymeric substances(EPS)formed by ionization of negatively charged functional groups,which maintain a stable hydrated colloidal structure and prevent the release of water.this is a key factor in the difficulty of sludge dewatering.in the last decade,sulfate radical-Based advanced oxidation processes(SR-AOPs)have received considerable attention due to their high efficiency for EPS disintegration,rapid reaction time and environmental friendliness,and thus sulfate radicals have become a new powerful tool for enhancing sludge dewaterability.in This paper,the development timeline and activation mechanisms of sulfate radicals are reviewed in detail,and the research advances of SR-AOPs for improving sludge dewaterability and removing micropollutants and heavy metals from sludge are systematically evaluated.based on the current scientific problems of SR-AOPs in sludge conditioning,the future research directions of SR-AOPs are proposed from the perspectives of mechanism research,cost-effectiveness,and experimental scale,in order to provide a solid theoretical reference for sludge conditioning in wastewater treatment plants in China。
1 Introduction
2 Timeline of sulfate radicals
3 Mechanism of sulfate radicals activation
3.1 Transition metal activation
3.2 Photo activation
3.3 Heat activation
3.4 Alkali activation
3.5 Metal-free catalyst activation
4 Sludge dewaterability improved by SR-AOPs
4.1 Iron activated methods
4.2 Heat activated methods
4.3 Electrochemically activated methods
4.4 Alkali activated methods
4.5 Other activation methods
5 Removal of micropollutants
6 Removal of heavy metals
7 Sludge dewatering mechanism
8 Conclusion and outlook
sulfate radicals / advanced oxidation process / sludge dewatering / conditioning mechanism / extracellular polymeric substances
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