Characteristics of migration and deposition of microorganisms under different seepage conditions in stormwater recharge
WU Yu-hui1,2, YANG Yue-suo1, LU Ying1, YAN Zi-han3, WANG Qian-dan1, SHI Min4
1. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China; 2. South China Institute of Environmental Sciences, MEE, Guangzhou 510535, China; 3. Key Laboratory of Surficial Geochemistry, Ministry of Education, Department of Hydrosciences, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China; 4. School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
Abstract：Based on the unique hydrodynamic and environmental conditions of stormwater artificial recharge, a series of one-dimensional seepage simulation experiments were conducted. The migration and deposition characteristics of clogging microorganisms within porous media under varying seepage conditions, such as different saturation levels, pH environments, ionic strengths, and recharge rates were systematically analyzed and the development of bioclogging within porous media under different seepage conditions was clarified. DLVO theory was used to reveal the dominant forces during microbial migration under different pH environments and ionic strengths. The results showed that the migration of microorganisms slowed down as saturation decreased, pH lowered, ionic strength of the recharge water increased, or recharge flow rate decreased. Consequently, deposition on the medium increased, while interlayer deposition became more uniform, promoting the formation of bioclogging within the medium. Changes in saturation, pH, or ionic strength had minimal effect on microbial migration when saturation was between 60% and 80%, pH was between 7.5 and 8.5, or ionic strength was between 1and 5mmol/L. Under unsaturated conditions, the impact of recharge rate variations on microbial migration and deposition was weakened when the recharge rate was within the range of 0.5to 1mL/min. Under different pH environments and ionic strengths, the dominant forces during microbial migration in saturated and unsaturated media were electrostatic forces and capillary forces, respectively.
武宇辉, 杨悦锁, 路莹, 闫子晗, 王茜丹, 石敏. 雨洪水回灌不同渗流状态下微生物迁移沉积特征[J]. 中国环境科学, 2025, 45(1): 487-499.
WU Yu-hui, YANG Yue-suo, LU Ying, YAN Zi-han, WANG Qian-dan, SHI Min. Characteristics of migration and deposition of microorganisms under different seepage conditions in stormwater recharge. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(1): 487-499.
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