EPF - Graduate School of Engineering, 3 bis rue Lakanal, 92330 Sceaux, France; Sorbonne Universités, UPMC Université Paris 06, CNRS, Laboratoire Interfaces et Systèmes Électrochimiques, 4 place Jussieu, F-75005, Paris, France.
EPF - Graduate School of Engineering, 3 bis rue Lakanal, 92330 Sceaux, France; Sorbonne Universités, UPMC Université Paris 06, CNRS, Laboratoire Interfaces et Systèmes Électrochimiques, 4 place Jussieu, F-75005, Paris, France.
Water Res. 2018 Oct 1;142:347-353. doi: 10.1016/j.watres.2018.05.052. Epub 2018 May 29.
Scale deposition is a common issue in industrial plants, which creates technical problems, i.e. reduction of heat transfer, decrease of flow rate due to an obstruction of pipes. Therefore, the development of some appropriate methods based on well suitable in situ sensors to evaluate and predict the scaling propensity of water is a major concern in current research. This would be a good strategy for the optimization of anti-scaling treatments. In this study, scaling tests were carried out using a sensitive sensor, which has been developed using a quartz crystal microbalance with a pre-calcified electrode surface (SQCM). This technique allowed studying the influence of the supersaturation on the scaling rate. The set-up was tested with different water samples which were brought to a given supersaturation coefficient by degassing the dissolved CO. The prediction of the scaling propensity of water was then possible through the relationship between the scaling rate on a pre-calcified surface and the supersaturation coefficient. In addition, the kinetics of CaCO deposit on the pre-calcified SQCM surface was found to be slower for natural water than for synthetic water (same calcium concentration). Furthermore, the activation energy for scale deposit, in synthetic water, was found to be 22 kJ.mol, which may be related to the diffusion of ions and/or CaCO nuclei in solution.
结垢是工业工厂中常见的问题，会造成技术问题，例如传热减少，由于管道堵塞导致流量下降。因此，开发一些基于合适原位传感器的适当方法来评估和预测水的结垢倾向是当前研究的主要关注点。这将是优化防垢处理的好策略。在这项研究中，使用一种敏感传感器进行了结垢测试，该传感器是使用带有预钙化电极表面的石英晶体微天平 (SQCM) 开发的。该技术允许研究过饱和度对结垢速率的影响。该装置通过在预钙化表面上的结垢速率与过饱和度系数之间的关系来测试不同的水样，这些水样通过脱除溶解的 CO 达到给定的过饱和度系数。然后可以通过在预钙化 SQCM 表面上的碳酸钙沉积物的动力学来预测水的结垢倾向。此外，发现天然水中碳酸钙在预钙化 SQCM 表面上的沉积动力学比合成水（相同的钙浓度）慢。此外，在合成水中，结垢沉积物的活化能为 22kJ.mol，这可能与溶液中离子和/或 CaCO 核的扩散有关。
