The effect of bioclogging on the hydraulic conductivity of saturated porous media at different recharge water temperatures

IF 2.4 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Hydrogeology Journal Pub Date : 2024-04-03 DOI:10.1007/s10040-024-02785-z

Shilin Wang, Liping Chen, Yanfeng Gong, Suning Ma, Yong Yang

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Abstract

Bioclogging in porous media is common and affects many engineering projects. The temperature of recharge water could significantly affect the process of bioclogging, thus impacting the hydraulic conductivity of porous media. In this study, a series of laboratory percolation experiments was conducted to understand the effects of recharge water temperature. The results of these experiments showed that bioclogging evolved in phases, and the gradual reduction (attenuation) of hydraulic conductivity caused by bioclogging could be described by an inverse logistic model. Analysis of microbial growth suggested that the bioclogging phases were strongly correlated with microbial growth stages. Both the clogging rate and degree of clogging through the seepage column decreased with distance from the inlet. Within the range of 10–25 ℃, the degree of clogging decreased with the increasing recharge water temperature; however, the degree of clogging increased with recharge water temperature within the range of 25–35 ℃. The relative hydraulic conductivity values decreased by 86.9% at a recharge water temperature of 10 ℃, 76.0% at 15 ℃, 65.1% at 20 ℃, 44.9% at 25 ℃, 82.5% at 30 ℃ and 98.7% at 35 ℃. Investigation by scanning electron microscopy found that the microorganism micromorphology differed at different recharge water temperatures, which made a significant difference in terms of clogging degree. A comprehensive model that describes hydraulic conductivity attenuation with varying recharge water temperature has been developed.

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不同补给水温度下生物积木对饱和多孔介质导水性的影响

多孔介质中的生物积水现象很常见，对许多工程项目都有影响。补给水的温度会极大地影响生物积水过程，从而影响多孔介质的水力传导性。本研究进行了一系列实验室渗流实验，以了解补给水温度的影响。实验结果表明，生物积涝是分阶段发生的，生物积涝导致的水力传导性逐渐降低（衰减）可以用一个逆对数模型来描述。微生物生长分析表明，生物堵塞阶段与微生物生长阶段密切相关。渗流柱的堵塞率和堵塞程度均随与入口距离的增加而降低。在 10-25 ℃ 范围内，堵塞程度随补给水温度的升高而降低；但在 25-35 ℃ 范围内，堵塞程度随补给水温度的升高而增加。在补给水温度为 10 ℃ 时，相对水力传导率值下降了 86.9%；在 15 ℃ 时，下降了 76.0%；在 20 ℃ 时，下降了 65.1%；在 25 ℃ 时，下降了 44.9%；在 30 ℃ 时，下降了 82.5%；在 35 ℃ 时，下降了 98.7%。扫描电子显微镜研究发现，在不同的补给水温度下，微生物的微观形态不同，堵塞程度也有显著差异。研究建立了一个全面的模型，用于描述补给水温度变化时的水力传导衰减。

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来源期刊

Hydrogeology Journal 地学-地球科学综合

CiteScore

5.40

自引率

7.10%

发文量

128

审稿时长

6 months

期刊介绍： Hydrogeology Journal was founded in 1992 to foster understanding of hydrogeology; to describe worldwide progress in hydrogeology; and to provide an accessible forum for scientists, researchers, engineers, and practitioners in developing and industrialized countries. Since then, the journal has earned a large worldwide readership. Its peer-reviewed research articles integrate subsurface hydrology and geology with supporting disciplines: geochemistry, geophysics, geomorphology, geobiology, surface-water hydrology, tectonics, numerical modeling, economics, and sociology.