Technion-Israel Institute of Technology, Department of Chemical Engineering, Rabin Desalination Laboratory-Grand Water Research Institute, Haifa 32000, Israel.
Water Res. 2013 Jul 1;47(11):3716-22. doi: 10.1016/j.watres.2013.04.022. Epub 2013 Apr 25.
A novel technique for evaluating the relative inhibition effectiveness of different anti-scalants is presented. The technique is based on the ability of anti-scalants to modify the scale deposition mechanism from mass transfer control to surface control. A rotating cylinder system which is known to provide well controlled mass transfer conditions is used to determine the scaling rate of a supersaturated solution dosed with various feed concentrations of an anti-scalant. Mass transfer conditions were characterized by turbulent flow at hydrodynamically smooth surface. In the absence of an anti-scalant, scale deposition is mass transfer controlled and scaling rate increases with rotation speed. With sufficient anti-scalant dosage, precipitation is modified to surface control and rotation speed has no effect on the scale deposition rate. Determination of the critical anti-scalant dosage enabling surface controlled precipitation provides a sensitive technique for comparing the relative effectiveness of different anti-scalants.
提出了一种评估不同阻垢剂相对抑制效果的新方法。该技术基于阻垢剂改变从传质控制到表面控制的结垢沉积机制的能力。使用已知可提供良好控制传质条件的旋转圆筒系统来确定用各种进料浓度的阻垢剂处理的过饱和溶液的结垢速率。传质条件通过在水力光滑表面的湍流来表征。在没有阻垢剂的情况下，结垢是传质控制的，并且结垢速率随转速的增加而增加。在有足够的阻垢剂剂量的情况下，沉淀被改造成表面控制，并且转速对沉淀速率没有影响。确定允许表面控制沉淀的临界阻垢剂剂量提供了一种比较不同阻垢剂相对效果的敏感技术。
