School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen 518055, PR China.
School of Advanced Materials, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen 518055, PR China.
Sci Total Environ. 2022 Dec 10;851(Pt 2):158263. doi: 10.1016/j.scitotenv.2022.158263. Epub 2022 Aug 27.
Bio-clogging in pipes poses a significant threat to the operation of leachate collection systems. Bio-clogging formation is influenced by the pipe materials. However, the relationship between bio-clogging and the physicochemical properties of different pipe materials has not been clarified yet, especially from a thermodynamic aspect. In this study, the dynamic bio-clogging processes in pipes of different materials (high-density polyethylene (HDPE), polyvinyl chloride (PVC), polypropylene (PP), and polyethylene (PE)) were compared, and their correlation with the physicochemical properties was investigated. Results showed that the bio-clogging in HDPE and PVC pipes was more severe than that in PP and PE pipes. In bio-clogging development, the predominant factor changed from the surface roughness to the electron donator parameter (γ). In the initial phase, the most severe bio-clogging was observed in the HDPE pipe, which exhibited the highest roughness (432 ± 76 nm). In the later phase, the highest γ (2.2 mJ/m) and protein content (2623.1 ± 33.2 μg/cm) were observed in the PVC simultaneously. Moreover, the interaction energy indicated that the bacteria could irreversibly and reversibly adhere to the HDPE, whereas irreversible adhesion was observed in the PVC, PP, and PE cases. The findings clarify the thermodynamic mechanism underlying bio-clogging behaviors and provide novel insights into the bio-clogging behaviors in pipes of different materials, which can facilitate the development of effective bio-clogging control strategies.
生物堵塞在管道中对渗滤液收集系统的运行构成了重大威胁。生物堵塞的形成受到管道材料的影响。然而，生物堵塞与不同管道材料的物理化学性质之间的关系尚未阐明，特别是从热力学角度来看。在这项研究中，比较了不同材料（高密度聚乙烯（HDPE）、聚氯乙烯（PVC）、聚丙烯（PP）和聚乙烯（PE））管道中的动态生物堵塞过程，并研究了它们与物理化学性质的相关性。结果表明，HDPE 和 PVC 管道中的生物堵塞比 PP 和 PE 管道中的更严重。在生物堵塞发展过程中，主要因素从表面粗糙度转变为电子供体参数（γ）。在初始阶段，HDPE 管中观察到最严重的生物堵塞，其粗糙度最高（432 ± 76nm）。在后期阶段，PVC 同时表现出最高的γ（2.2mJ/m）和蛋白质含量（2623.1 ± 33.2μg/cm）。此外，相互作用能表明细菌可以不可逆和可逆地附着在 HDPE 上，而在 PVC、PP 和 PE 情况下则观察到不可逆附着。这些发现阐明了生物堵塞行为的热力学机制，并为不同材料管道中的生物堵塞行为提供了新的见解，这有助于开发有效的生物堵塞控制策略。
