雨洪水回灌不同渗流状态下微生物迁移沉积特征

武宇辉; 杨悦锁; 路莹; 闫子晗; 王茜丹; 石敏

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (1) : 487-499.

环境微生物

雨洪水回灌不同渗流状态下微生物迁移沉积特征

武宇辉^1,2, 杨悦锁¹, 路莹¹, 闫子晗³, 王茜丹¹, 石敏⁴

作者信息 +

Characteristics of migration and deposition of microorganisms under different seepage conditions in stormwater recharge

WU Yu-hui^1,2, YANG Yue-suo¹, LU Ying¹, YAN Zi-han³, WANG Qian-dan¹, SHI Min⁴

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文章历史 +

摘要

针对雨洪水人工回灌特有的水动力和水环境条件,通过系列一维渗流模拟试验,系统分析不同饱和度、酸碱环境、离子强度和回灌速度等渗流状态下堵塞模式微生物在多孔介质内的迁移沉积特征,进而明确不同渗流状态下多孔介质内部微生物堵塞发展状况,同时通过DLVO理论计算揭示不同酸碱环境和离子强度下微生物运移过程中主控作用力.结果显示,当介质饱和度降低、介质内pH值下降、回灌水离子强度增加或回灌流速降低时,堵塞微生物迁移均会变慢,在介质上的沉积增加且层间沉积非均匀程度降低,导致介质内部更易形成生物堵塞.饱和度介于60%~80%、pH值介于7.5~8.5或离子强度介于1~5mmol/ L范围内时,分别改变饱和度、pH值或者离子强度,对微生物迁移的影响较弱.渗流速度在0.5~1mL/min范围内,非饱和条件会削弱流速变化对菌体迁移沉积的影响.不同酸碱环境和离子强度下,饱和与非饱和介质中微生物运移主控作用力分别为静电作用力和毛细管作用力.

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.

导出引用

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[J]. China Environmental Science. 2025, 45(1): 487-499

中图分类号： X172

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