College of Material and Environment Engineering, Hangzhou Dianzi University, Hangzhou, People's Republic of China.
Key Laboratory of Drinking Water Safety and Distribution Technology of Zhejiang Province, Zhejiang University, Hangzhou, People's Republic of China.
Environ Technol. 2023 Jun;44(15):2270-2279. doi: 10.1080/09593330.2022.2026487. Epub 2022 Jan 25.
Bioclogging is a commonly encountered operational issue that lowers hydraulic conductivity and the overall performance of the infiltration systems. In this paper, a novel processing for alleviating bioclogging by filter media surface hydrophobic modification was presented. Two-dimensional porous media cells were used to observe the influence of hydrophobic modification on biofilm growth in the pore structure. Moreover, two continuous-flow columns packed with gravel, one of which half gravel was hydrophobically modified, were operated with artificial wastewater to verify the effect of hydrophobic modification on bioclogging alleviation. The results showed that the biofilm growth in the cell with hydrophobic modification was slow, and the biomass was less and liable to wipe off after hydrophobic treatment. Meanwhile, the hydraulic efficiency of the flow seepage field was also improved after hydrophobic treatment. The column tests results showed that the hydraulic conductivity of the filter bed with hydrophobic modification (Column B) decreased more slowly than that of another without hydrophobic modification (Column A). Column B had the hydraulic conductivity () of 0.66 cm/s in the final stage of the experiment, while the of Column A was 0.14 cm/s. It verified that hydrophobic modification of partial filter media can alleviate the bioclogging problem of the infiltration systems to some extent. The results provide a new idea and potential technical support for solving bioclogging problem.
生物堵塞是一个常见的运行问题，会降低水力传导率和渗透系统的整体性能。本文提出了一种通过过滤介质表面疏水改性来缓解生物堵塞的新方法。使用二维多孔介质单元观察疏水改性对孔隙结构中生物膜生长的影响。此外，使用人工废水运行了两个砾石填充的连续流柱，其中一个半砾石进行了疏水改性，以验证疏水改性对缓解生物堵塞的效果。结果表明，改性后细胞内的生物膜生长缓慢，生物量较少，疏水后易于擦拭。同时，疏水后渗流场的水力效率也得到了提高。柱试验结果表明，具有疏水改性的过滤床的水力传导率（柱 B）比另一个没有疏水改性的过滤床（柱 A）下降得更慢。在实验的最后阶段，柱 B 的水力传导率为 0.66 cm/s，而柱 A 的 为 0.14 cm/s。这验证了部分过滤介质的疏水改性可以在一定程度上缓解渗透系统的生物堵塞问题。该结果为解决生物堵塞问题提供了新的思路和潜在的技术支持。
