生物滞留池在冻融循环下的氮去除性能：填料结构和微生物群落的影响。
Nitrogen removal performance of bioretention cells under freeze-thaw cycles: Effects of filler structure and microbial community.
机构信息
Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, 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, China; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Yan Ta Road. No.13, Xi'an, 710055, China.
出版信息
J Environ Manage. 2024 Oct;369:122380. doi: 10.1016/j.jenvman.2024.122380. Epub 2024 Sep 4.
Cold climates have an adverse effect on the nitrogen-removal capacity of bioretention cells, especially during freeze-thaw cycles (FTCs). To explore the effects of FTCs on the nitrogen removal performance of bioretention cells, this research compared the effects of FTCs on the pore structure and microbial community composition of the filler, and analyzed the nitrogen removal performance of the bioretention cell before (RT), during (FTC) and after (RRT) FTCs. The results demonstrated that RRT filler had a much greater number of pores with equivalent diameter <500 μm than RT filler, and that RRT had a higher pore volume and pore density than RT. Microbial community analysis revealed that the diversity and richness of the microbial community in FTC were lower than in RT, and the relative abundance of Lacunisphaera, Pseudomonas, and Dokdonella decreased significantly. There was no significant difference in microbial community richness between RRT and RT, however RRT diversity was lower. RRT has a higher relative abundance of nitrifying bacteria (Subgroup_10, Bryobacter, etc.) than RT, but a lower relative abundance of denitrifying bacteria (Pseudomonas, Dokdonella, Arenimonas, etc.). The nitrogen removal efficiency of FTC was inhibited, resulting in a decrease of 13.0 ± 4.86%, 19.7 ± 9.17%, and 26.6 ± 1.74% in the removal rates of ammonia nitrogen(NH-N), nitrate nitrogen(NO-N), and total nitrogen(TN) when compared to RT, respectively. RRT improved nitrification and increased NH-N removal rate by 10.3 ± 2.69% compared to RT. However, because of denitrification inhibition, the nitrogen removal performance of RRT was not able to reach RT levels, and its NO-N and TN removal rates decreased by 100 ± 4.70% and 58.3 ± 3.71%, respectively. This study has demonstrated that FTCs can permanently harm the bioretention cell's filler structure and microbial community, resulting in a significant decrease in the nitrogen removal performance of the bioretention cell designed according to warm climate conditions after experiencing FTCs.
寒冷气候对生物滞留池的脱氮能力有不利影响，特别是在冻融循环（FTC）期间。为了探究 FTC 对生物滞留池脱氮性能的影响，本研究比较了 FTC 对填料孔隙结构和微生物群落组成的影响，并分析了 FTC 前后（RT、FTC 和 RRT）生物滞留池的脱氮性能。结果表明，RRT 填料的等效孔径<500μm的孔隙数量明显多于 RT 填料，RRT 的孔体积和孔密度均高于 RT。微生物群落分析表明，FTC 中微生物群落的多样性和丰富度低于 RT，Lacunisphaera、Pseudomonas 和 Dokdonella 的相对丰度显著降低。RRT 与 RT 之间微生物群落丰富度无显著差异，但 RRT 的多样性较低。RRT 中的硝化细菌（Subgroup_10、Bryobacter 等）相对丰度高于 RT，但反硝化细菌（Pseudomonas、Dokdonella、Arenimonas 等）相对丰度较低。FTC 的脱氮效率受到抑制，导致氨氮（NH-N）、硝酸盐氮（NO-N）和总氮（TN）的去除率分别比 RT 降低 13.0±4.86%、19.7±9.17%和 26.6±1.74%。与 RT 相比，RRT 提高了硝化作用，使 NH-N 去除率提高了 10.3±2.69%。然而，由于反硝化抑制，RRT 的脱氮性能无法达到 RT 水平，其 NO-N 和 TN 去除率分别降低了 100±4.70%和 58.3±3.71%。本研究表明，FTC 可永久性损害生物滞留池的填料结构和微生物群落，导致按温暖气候条件设计的生物滞留池在经历 FTC 后，其脱氮性能显著下降。
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