Porous media are widely adopted as immobilization sorbents in environmental engineering. The microscale difference in pore structure formation causes significant deflection in a vast landscape. Computational fluid dynamics (CFD) offers a comparative approach to evaluate the individual influence from pore structure formation with strictly controlled surface and volume properties. This paper presents a comprehensive comparison between the performance of cylindrical media and spherical-media in heavy metal immobilization. Digital testing was performed to measure the surface area, specific surface area, density and porosity. Image-based input technique was developed to reconstruct the cylindrical media. It was found that although the surface area, specific surface area and porosity were the same, the spherical media still had an accelerated immobilization rate. Results further showed that the spherical media in floatation arrangement had an immobilization rate of 16% higher than the cylindrical media with the same surface properties. Non-floatation arrangement of the spherical media caused a reduction in immobilization capacity up to 32.8% lower than the cylindrical media. The cylindrical media demonstrated an advantage of being structurally stable under high porosity, the latter of which resulted in an increased immobilization capacity compared with the spherical-media. The results suggest that the cylindrical bio-microstructure is desirable for heavy metal immobilization in a non-flotational environment. The computational approach provides a digital solution to evaluate the immobilization in 3D architected media. The proposed testing methods are feasible for both experimentally obtained images and structures from algorithm-generation.

多孔介质被广泛用作环境工程中的固定吸附剂。孔隙结构形成的微观差异会导致广阔景观中的明显变形。计算流体动力学（CFD）提供了一种比较方法，可通过严格控制表面和体积特性来评估孔结构形成对个体的影响。本文对圆柱形介质和球形介质在重金属固定方面的性能进行了全面的比较。进行数字测试以测量表面积，比表面积，密度和孔隙率。开发了基于图像的输入技术来重建圆柱介质。发现尽管表面积，比表面积和孔隙率是相同的，球形介质仍具有加速的固定速率。结果还表明，与具有相同表面特性的圆柱形介质相比，浮置球形介质的固定率高出16％。球形介质的非漂浮布置导致固定能力的降低比圆柱形介质低多达32.8％。圆柱形介质表现出在高孔隙率下结构稳定的优点，与球形介质相比，后者导致固定能力提高。结果表明，圆柱形生物微观结构对于非浮选环境中的重金属固定化而言是理想的。该计算方法提供了一种数字解决方案，用于评估3D架构化媒体中的固定性。