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<p>Bio-clogging is a prevalent phenomenon in nature, impacting numerous engineering projects. The concentration of salt in a solution has a significant effect on microbial clogging processes, leading to alterations in the permeability of porous media. This study explores the influences mechanisms of solution salinity on the microbial clogging in porous media at the pore scale. We utilized Lattice Boltzmann model with immersed boundary (LBM–IMB) to simulate the flow field and solute transport in porous media while the cellular automaton model was employed to simulate microbial growth. Firstly, the biofilm growth kinetics model was validated under hydrostatic conditions. Secondly, the parameters of microbial growth characteristics were determined under varying NaCl concentrations by experiments. Finally, we examined the effects of NaCl concentration on microbial growth, spatial heterogeneity, flow field and concentration field, and permeability in porous media. The main results are as follows: (1) Microbial growth exhibits heterogeneity in both temporal and spatial dimensions. (2) When the NaCl concentration ranged from 3.0 to 8.0&#xa0;g/L, an increase in salt concentration facilitated microbial growth. However, the microbial growth was inhibited at the NaCl concentration of 18.0&#xa0;g/L. (3) The flow field in porous media was significantly affected by the microbial growth at the different NaCl concentration. However, the overall nutrient concentration field in porous media was not relative to the microbial growth. (4) The occurring moments of bio-clogging are 68.0, 66.0, 56.0, and 91.0&#xa0;h at the NaCl concentrations of 3.0, 6.0, 8.0, and 18.0&#xa0;g/L.</p>

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Effect of Solution Salinity on Bio-clogging in Porous Media at the Pore Scale

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Yong Yang,
  • Shilin Wang,
  • Yanfeng Gong,
  • Liping Chen,
  • Hang Li,
  • Chuangpin Zhang

摘要

Bio-clogging is a prevalent phenomenon in nature, impacting numerous engineering projects. The concentration of salt in a solution has a significant effect on microbial clogging processes, leading to alterations in the permeability of porous media. This study explores the influences mechanisms of solution salinity on the microbial clogging in porous media at the pore scale. We utilized Lattice Boltzmann model with immersed boundary (LBM–IMB) to simulate the flow field and solute transport in porous media while the cellular automaton model was employed to simulate microbial growth. Firstly, the biofilm growth kinetics model was validated under hydrostatic conditions. Secondly, the parameters of microbial growth characteristics were determined under varying NaCl concentrations by experiments. Finally, we examined the effects of NaCl concentration on microbial growth, spatial heterogeneity, flow field and concentration field, and permeability in porous media. The main results are as follows: (1) Microbial growth exhibits heterogeneity in both temporal and spatial dimensions. (2) When the NaCl concentration ranged from 3.0 to 8.0 g/L, an increase in salt concentration facilitated microbial growth. However, the microbial growth was inhibited at the NaCl concentration of 18.0 g/L. (3) The flow field in porous media was significantly affected by the microbial growth at the different NaCl concentration. However, the overall nutrient concentration field in porous media was not relative to the microbial growth. (4) The occurring moments of bio-clogging are 68.0, 66.0, 56.0, and 91.0 h at the NaCl concentrations of 3.0, 6.0, 8.0, and 18.0 g/L.