Liu Yu, Tay Joo-Hwa
Environmental Engineering Research Centre, School of Civil and Structural Engineering, Nanyang Technological University, Singapore, Singapore.
Water Res. 2002 Apr;36(7):1653-65. doi: 10.1016/s0043-1354(01)00379-7.
Biofilm and granular sludge processes are promising biotechnology for wastewater treatment. The formation, structure and metabolism of immobilized microbial community are associated very closely with hydrodynamic shear force in reactors. Therefore, this paper attempts to review the essential role of shear force in the formation and performance of biofilm and granular sludge. More compact, stable and denser biofilms, aerobic and anaerobic granules form at relatively higher hydrodynamic shear force. It is clearly shown that shear force has significant influences on the structure, mass transfer, production of exopolysaccharides, metabolic/genetic behaviours of biofilms, aerobic and anaerobic granules. In an engineering sense, hydrodynamic shear force can be manipulated, as a control parameter, to enhance microbial granulation process. It can be concluded that the knowledge regarding the effects of hydrodynamic shear force on biofilms and granules is far from complete and much research is still needed to fully understand the relevant mechanisms. Some of these future research niches are therefore outlined.
生物膜和颗粒污泥工艺是很有前景的污水处理生物技术。固定化微生物群落的形成、结构和代谢与反应器中的水力剪切力密切相关。因此，本文试图综述剪切力在生物膜和颗粒污泥的形成及性能方面的重要作用。在相对较高的水力剪切力下会形成更致密、稳定且密集的生物膜、好氧和厌氧颗粒。结果表明，剪切力对生物膜、好氧和厌氧颗粒的结构、传质、胞外多糖的产生、代谢/遗传行为有显著影响。从工程角度来看，水力剪切力可作为一个控制参数进行调控，以强化微生物颗粒化过程。可以得出结论，关于水力剪切力对生物膜和颗粒影响的知识还远未完善，仍需要大量研究来充分理解相关机制。因此，本文概述了一些未来的研究方向。
