硫酸根自由基:强化污泥脱水新利器
Sulfate Radicals:A New Tool for Enhancing Sludge Dewatering
赖月 1王超 1张洁 1周顺桂 1刘昌庚 2叶捷1
作者信息
- 1. 福建农林大学资源与环境学院福建省土壤环境健康与调控重点实验室 福州 350002
- 2. 四川师范大学化学与材料科学学院 成都 610066
- 折叠
摘要
污泥是污水处理过程中不可避免的副产物.由于其含水率高、体积大且含有大量有毒有害物质,因此需要进行减量化和无害化处理.然而,污泥拥有带负电官能团电离形成的胞外聚合物(EPS),能够维持稳定的水合胶体结构阻止水的释放,是造成污泥脱水困难的关键因素.近十年,基于硫酸根自由基的高级氧化技术(SR-AOPs)因其对EPS破解效率高、反应迅速且环境友好等优点受到大量关注,硫酸根自由基也因此成为强化污泥脱水的新利器.本文详细梳理了硫酸根自由基的发展时间线和活化机制,系统评价了国内外SR-AOPs改善污泥脱水性能、去除污泥中微量污染物和重金属的研究现状.基于现阶段SR-AOPs在污泥调理方面存在的科学问题,从机理研究、成本效益、试验规模等角度展望了未来的发展研究方向,以期为我国污水处理厂的污泥调理提供参考.
Abstract
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.
关键词
硫酸根自由基/高级氧化技术/污泥脱水/调理机制/胞外聚合物Key words
sulfate radicals/advanced oxidation process/sludge dewatering/conditioning mechanism/extracellular polymeric substances引用本文复制引用
基金项目
福建省生态产业绿色技术重点实验室开放基金(WYKF-EIGT2021-3)
出版年
2024
NETL
NSTL
万方数据