HUKai,BIANMALa-zhen,WANGWei,et al.Effect of Polyvinyl Chloride and Sulfadiazine Combined Pollution on Activated Sludge[J].China Water & Wastewater,2024,40(3):79-88.
Effect of Polyvinyl Chloride and Sulfadiazine Combined Pollution on Activated Sludge
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第3期
Page:
79-88
Column:
Date of publication:
2024-02-01
- Keywords:
- microplastics; organic pollutant; activated sludge; polyvinyl chloride; sulfadiazine; extracellular polymeric substances; microbial community
- Abstract:
- The adsorption of organic pollutants on microplastics (MPs) in water may result in composite toxic effects. However, the interaction between MPs and organic pollutants and its effect on biological wastewater treatment system are still unclear. In this study, the effects of co-existence of sulfadiazine (SDZ) and polyvinyl chloride (PVC) in simulated sewage on the treatment performance and extracellular polymeric substances (EPS) of activated sludge system were investigated, and the changes of sludge dehydrogenase activity and microbial community composition were analyzed. When the concentrations of PVC and SDZ were both 15 mg/L, the hydrophobic SDZ was easy to be adsorbed on the surface of PVC and form composite pollutants, resulting in the removal rates of COD and ammonia nitrogen decreased by 55.4% and 54.9%, respectively. Meanwhile, the sludge secreted more protein and polysaccharide in EPS to protect itself. In addition, the co-existence of PVC and SDZ resulted in a significant decrease in microbial diversity, and the relative abundance of Bacteroidia, Gammaproteobacteria, Flavobacterium and Pseudofulvimonas decreased by 9.53%, 4.39%, 7.25% and 6.21% respectively compared with that of the control group. The decrease in the removal rates of COD and ammonia nitrogen was attributed to the decrease of the number of organic pollutant-degrading bacteria and the weakening of its ability to produce lyase.
Last Update:
2024-02-01