Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 399, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123049
Keywords
Microplastics; Triclosan; Nitri fication; Antibiotic resistance genes; Microbial community structure
Categories
Funding
- National Science and Technology Major Project [2017ZX07103-003]
- Beijing Natural Science Foundation [8202006]
- Beijing Municipal Science and Technology Project [Z181100005518002]
- National Natural Science Foundation of China [51578015]
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As more and more microplastics (MPs) and triclosan (TCS), which are added in consumer products, enter wastewater treatment plants with sewage, there are concerns about the impacts of the co-occurrence of MPs and TCS on biological wastewater treatment. In this study, the co-effects of four 1 mg/L MPs (polyethylene (PE), polystyrene (PS), polyvinyl chloride (PVC) and polyamide (PA)) and 0.5 mg/L TCS on nitrification were investigated in lab-scale nitrifying sequencing batch reactors (SBRs) (SBR-PE, SBR-PS, SBR-PVC and SBR-PA) relative to control which received no MPs (SBR-CK). The removal rates of NH4+-N and TCS in SBR-CK were around 100% and 92%, respectively. Compared with SBR-CK, no measurable inhibition was observed on nitrification in SBR-PE and SBR-PS, however, SBR-PVC and SBR-PA rapidly lost nitrification function during 14 days, which might be due to the reducing of MLSS caused by PVC, PA and TCS co-loading. Furthermore, PS, PVC and PA decreased the removal of TCS. The co-occurrence of TCS and PS, PVC, PA increased extracellular polymeric substances, reduced microbial diversity and shifted microbial communities. Notably, the acrA-03, mexF, fabI, intI1, intI3 and IS613 genes were enriched by MPs and TCS co-loading. Therefore, the removal of MPs and TCS from wastewater should be prioritized.
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