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Progress in Chemistry DOI: 10.7536/PC230707   

Sulfate Radicals: A New Tool for Enhancing Sludge Dewatering

Yue Lai1, Chao Wang1, Jie Zhang1, Shungui Zhou1, Changgeng Liu2,*, Jie Ye1,*   

  1. 1. College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China;
    2. College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China
  • Received: Revised:
  • Contact: *e-mail: changwyx@163.com;jieye@fafu.edu.cn
  • Supported by:
    Open Fund of Key Laboratory of Green Technology in Ecological Industry of Fujian Province (WYKF-EIGT2021-3).
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Sludge is an inevitable by-product of the wastewater treatment process. Due to its high water content, large volume, and a large amount of toxic and hazardous substances, therefore it needs to be minimization and harmless treatment. 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 were reviewed in detail, and the research advances of SR-AOPs for improving sludge dewaterability and removing micropollutants and heavy metals from sludge were systematically evaluated. Based on the current scientific problems of SR-AOPs in sludge conditioning, the future research directions of SR-AOPs were 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.
Key words: sulfate radicals, advanced oxidation process, sludge dewatering, conditioning mechanism, extracellular polymeric substances

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