Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, PR China; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Yan Ta Road. No.13, Xi'an, 710055, China.
Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, PR China; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Yan Ta Road. No.13, Xi'an, 710055, China.
Environ Pollut. 2023 Dec 1;338:122655. doi: 10.1016/j.envpol.2023.122655. Epub 2023 Sep 29.
The use of bioretention cells as a stormwater control measure allows stormwater runoff to be collected and filtered, effectively removing microplastics and other pollutants from stormwater. This study investigated the effect of polyethylene microplastics (PE-MPs) retention on the bioretention cell, in terms of denitrification performance and microbial community structure. Four PE-MP exposures were compared at different concentrations of 0, 250, 500 and 1000 mg/L under alternating dry and wet period conditions. Results showed that the removal efficiency reduced by 14.99%, 28.37% and 18.59% with PE-MP concentrations of 250, 500 and 1000 mg/L. The NO-N removal efficiency increased by 36.19%, 20.19% and 35.39%. After 8 days of dry conditions, the NO-N removal efficiencies of the bioretention cells were reduced by 36.66%, 46.86% and 31.11% compared to those after 2 days of dry conditions. Microbial sequencing results indicated that the accumulation of PE-MPs changed the microbial community structure within the bioretention cell filler material, promoting the growth of bacteria such as Actinobacteria, Bacteroidetes and Firmicutes. Furthermore, PE-MPs reduced the relative abundance of nitrifying bacteria (e.g. Nitrospira) within the bioretention cell and promoted denitrifying bacteria (e.g. Dechloromonas and Hydrogenophaga), along with numerous other genera such as Azotobacter and Nocardia.
生物滞留池作为一种雨水控制措施，可以收集和过滤雨水，有效去除雨水中的微塑料和其他污染物。本研究考察了聚乙烯微塑料（PE-MPs）滞留对生物滞留池的影响，包括脱氮性能和微生物群落结构。在干湿交替条件下，比较了 0、250、500 和 1000 mg/L 四种不同浓度的 PE-MPs 暴露对生物滞留池的影响。结果表明，PE-MP 浓度为 250、500 和 1000 mg/L 时，去除效率分别降低了 14.99%、28.37%和 18.59%。NO-N 的去除效率分别增加了 36.19%、20.19%和 35.39%。在 8 天的干燥条件下，与 2 天的干燥条件相比，生物滞留池的 NO-N 去除效率分别降低了 36.66%、46.86%和 31.11%。微生物测序结果表明，PE-MPs 的积累改变了生物滞留池填充材料中的微生物群落结构，促进了放线菌、拟杆菌和厚壁菌等细菌的生长。此外，PE-MPs 减少了生物滞留池内硝化细菌（如硝化螺旋菌）的相对丰度，促进了反硝化细菌（如脱氯菌和噬氢菌）以及其他许多属，如固氮菌和诺卡氏菌的生长。
