Abstract Biofilm growth can impact seepage flow properties in the porous media, thereby affecting the performance of the infiltration systems. To better understand and characterize the biofilm distribution and its effect on seepage flow fields in the porous media with different morphologies, two-dimensional transparent flow cells were developed using X-ray images of zeolite, gravel, and ceramsite columns to study the effect of biofilm development and the pore structure on seepage flow properties. The results revealed that the filter morphology and biofilm growth significantly impacted the seepage flow field in porous media. With biofilm growth, a preferential flow pathway was more likely to be formed in angular filter cells (zeolite-shaped cells) than spherical filter cells (ceramsite-shaped cells). It was also found that microbial growth rate was closely related to seepage flowrate in 2D porous media cells. The biofilm grew faster in the areas with higher seepage flowrate. The biofilm accumulation did not seem to affect the location of the preferential seepage flow, probably due to the high permeability of the biofilm in the large pore throats. Although the water head loss of ceramsite-shaped cells was larger than that of two others due to its relatively smaller size of pore throat, the ceramsite-shaped cells presented small dead zone and short-circuiting, which means that ceramiste filter media had higher hydraulic efficiency.

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不同过滤器形态多孔介质中生物膜发展渗流特性的实验研究

摘要 生物膜的生长会影响多孔介质中的渗流特性，从而影响渗透系统的性能。为了更好地理解和表征不同形态多孔介质中生物膜的分布及其对渗流场的影响，利用沸石、砾石和陶粒柱的 X 射线图像开发了二维透明流动池，以研究生物膜的影响发展和孔隙结构对渗流特性的影响。结果表明，过滤器形态和生物膜生长显着影响多孔介质中的渗流流场。随着生物膜的生长，角形过滤器细胞（沸石形细胞）比球形过滤器细胞（陶粒形细胞）更容易形成优先流动通道。还发现微生物生长速率与二维多孔介质细胞中的渗流速率密切相关。生物膜在渗流率较高的区域生长较快。生物膜的积累似乎没有影响优先渗流的位置，可能是由于大孔喉中生物膜的高渗透性。虽然陶粒状细胞由于孔喉尺寸相对较小，其水头损失比其他两种大，但陶粒状细胞呈现出小的死区和短路现象，这意味着陶粒状滤料具有较高的水力损失。效率。生物膜的积累似乎没有影响优先渗流的位置，可能是由于大孔喉中生物膜的高渗透性。虽然陶粒状细胞由于孔喉尺寸相对较小，其水头损失比其他两种大，但陶粒状细胞呈现出小的死区和短路现象，这意味着陶粒状滤料具有较高的水力损失。效率。生物膜的积累似乎没有影响优先渗流的位置，可能是由于大孔喉中生物膜的高渗透性。虽然陶粒状细胞由于孔喉尺寸相对较小，其水头损失比其他两种大，但陶粒状细胞呈现出小的死区和短路现象，这意味着陶粒状滤料具有较高的水力损失。效率。