School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China; Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, China.
School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China; Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, China.
Environ Pollut. 2024 Nov 1;360:124638. doi: 10.1016/j.envpol.2024.124638. Epub 2024 Jul 31.
A comparative study explored how photoaging, ozonation aging, and Fenton aging affect tire wear particles (TWPs) and their phosphorus (P) removal in activated sludge. Aging altered TWPs' properties, increasing surface roughness, porosity, and generating more small particles, especially environmental persistent free radicals (EPFRs) in ozonation and Fenton aging. Post-aging TWPs (50 mg/L) inhibited sludge P removal significantly (p < 0.05), with rates of 44.3% and 59.6% for ozonation and Fenton aging, respectively. In addition, the metabolites involved in P cycling (poly-β-hydroxyalkanoates: PHA and glycogen) and essential enzymes (Exopolyphosphatase: PPX and Polyphosphate kinase: PPK) were significantly inhibited (p < 0.05). Moreover, TWPs led to a decrease in microbial cells within the sludge and altered the community structure, a situation exacerbated by the aging of TWPs. P-removing bacteria decreased (e.g., Burkholderia, Candidatus), while extracellular polymeric substance-secreting bacteria increased (e.g., Pseudomonas, Novosphingobium). Pearson correlation analysis highlighted EPFRs' role in TWPs' acute toxicity to microbial cells, yet, emphasizing particle size's impact on the sludge system's purification and community structure.
一项对比研究探索了光老化、臭氧化老化和芬顿老化对轮胎磨损颗粒（TWP）及其在活性污泥中除磷的影响。老化改变了 TWP 的性质，增加了表面粗糙度、孔隙率，并产生了更多的小颗粒，特别是臭氧化和芬顿老化过程中产生的环境持久性自由基（EPFRs）。老化后的 TWP（50mg/L）显著抑制了污泥的磷去除（p<0.05），臭氧化和芬顿老化的去除率分别为 44.3%和 59.6%。此外，与 P 循环相关的代谢物（聚-β-羟基烷酸酯：PHA 和糖原）和必需酶（外切多聚磷酸酶：PPX 和多聚磷酸激酶：PPK）受到显著抑制（p<0.05）。此外，TWP 导致污泥中微生物细胞数量减少，并改变了群落结构，TWP 的老化加剧了这种情况。除磷菌减少（如 Burkholderia、Candidatus），而分泌胞外聚合物的细菌增加（如 Pseudomonas、Novosphingobium）。Pearson 相关分析强调了 EPFRs 在 TWP 对微生物细胞急性毒性中的作用，但也强调了粒径对污泥系统净化和群落结构的影响。
