Bioretention system mediated by different dry-wet alterations on nitrogen removal: Performance, fate, and microbial community

Yao Chen; Renyu Chen; Zhen Liu; Bangxing Ren; Qiong Wu; Jian Zhang; Yinghui Tang; Qingyu Wu

doi:10.1016/j.scitotenv.2022.154295

Bioretention system mediated by different dry-wet alterations on nitrogen removal: Performance, fate, and microbial community

Sci Total Environ. 2022 Jun 25:827:154295. doi: 10.1016/j.scitotenv.2022.154295. Epub 2022 Mar 2.

Authors

Yao Chen¹, Renyu Chen², Zhen Liu³, Bangxing Ren⁴, Qiong Wu², Jian Zhang⁵, Yinghui Tang², Qingyu Wu²

Affiliations

¹ School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China; Engineering Laboratory of Environmental Hydraulic Engineering of Chongqing Municipal Development and Reform Commission, Chongqing Jiaotong University, Chongqing 400074, China.
² School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
³ School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China; Engineering Laboratory of Environmental Hydraulic Engineering of Chongqing Municipal Development and Reform Commission, Chongqing Jiaotong University, Chongqing 400074, China. Electronic address: ZhenL77@163.com.
⁴ Environmental Engineering and Science Program, Department of Chemical and Environmental Engineering (ChEE), University of Cincinnati, Cincinnati, OH 45221-0071, USA.
⁵ State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China.

PMID: 35247404
DOI: 10.1016/j.scitotenv.2022.154295

Abstract

In laboratory experiments, the nitrogen migration and transformation in the stormwater bioretention system under different dry-wet alterations were studied. The removal efficiency showed that nitrogen could be removed efficiently in bioretention system under all dry-wet alterations, and the shorter antecedent dry days (ADDs) (1-5 days) were beneficial to the removal of nitrogen before plants decay, compared to the longer ADDs (7-22 days). Using a new method combined with Hydrus-1D model, water transport was simulated and nitrogen migration in bioretention system was quantified, indicating that NH₄⁺-N was mainly removed in the planting layer, and the removal of NO₃^--N was occurred in the submerged layer. Fate experiment showed the main fate of the nitrogen was microorganisms (1-5 ADDs) and soil immobilization (7-22 ADDs). Microbial analysis showed that shorter ADDs (1-5 days) were suitable for Firmicutes growth, while Proteobacteria and Actinobacteria accounted for greater abundance under longer ADDs (7-22 days). Canonical correlation analysis (CCA) revealed the relationships between microbial community and environmental factors. Soil moisture content, soil organic matter (SOM), TN (water), root length, and NO₃^--N (water) were significantly correlated with bacterial community. This work may give new insights into nitrogen migration and transformation, and can provide a reference for the further mechanism study and construction of stormwater bioretention systems.

Keywords: Bioretention; Dry–wet alteration; Microbial community; Migration and transformation; Nitrogen.

MeSH terms

Denitrification
Microbiota*
Nitrogen* / analysis
Rain
Soil
Water

Substances

Soil
Water
Nitrogen