Cloete T E, Westaard D, van Vuuren S J
Department of Microbiology and Plant Pathology, University of Pretoria, Pretoria 0001, South Africa.
Water Sci Technol. 2003;47(5):57-9.
Biofouling in pipelines is a function of the inner roughness of the specific piping material that is used in distribution systems and the concomitant biofilm formation. To test the effect of velocity on the growth of biofilm, a Roto-Scope was designed and built to imitate different materials and flow conditions in potable water distribution systems. Biofilm formation was monitored using DAPI staining and the total number of viable bacteria. Increased velocity in the system resulted in a specific detaching velocity, where the formation of biofilm was limited. Most of the time these detaching velocities were not the highest velocities tested. The range of detaching velocities was between +/- 3 m x s(-1) and 4 m x s(-1). A flow velocity within this range would thus be ideal for achieving reduced biofilm growth in a distribution system.
管道中的生物污垢是由配水系统中使用的特定管道材料的内粗糙度以及随之而来的生物膜形成所决定的。为了测试流速对生物膜生长的影响，设计并制造了一个旋转视镜，以模拟饮用水分配系统中的不同材料和流动条件。使用DAPI染色和活菌总数监测生物膜的形成。系统中流速的增加导致了一个特定的剥离速度，在该速度下生物膜的形成受到限制。大多数情况下，这些剥离速度并非测试的最高速度。剥离速度范围在+/- 3 m·s⁻¹至4 m·s⁻¹之间。因此，在此范围内的流速对于在分配系统中减少生物膜生长将是理想的。
