摘要
电吸附脱盐的效果受热力学和动力学两大因素影响,热力学因素主要取决于电极采用的材料性质、等温线的吸附数值等,动力学因素主要取决于电子迁移的速度、对流和扩散作用。单位场强下电子的流动所导致的金属原子移动速率取决于电子迁移轨迹的速度,工作流量的大小决定着对流作用的强弱,扩散系数是扩散作用的基础。重碳酸盐的扩散系数偏低,碱度用重碳酸盐的表示,本文研究不同重碳酸盐浓度与电吸附脱盐的关系。结果表明:重碳酸盐碱度对电吸附设备的脱盐性能及氯离子、总硬度和重碳酸根碱度的去除效果产生了很大的影响。在处理高重碳酸盐碱度水时,重碳酸根离子与水中的钙镁离子发生了化学反应,在电极板上形成结晶垢体,导致脱盐率有所降低。在处理低浓度重碳酸盐碱度水时,电吸附设备有自动溶解结晶垢体的功能,使脱盐性能得到改善。通过本实验发现,重碳酸盐碱度是导致电吸附设备极板结垢的主要原因。
The effect of electrosorption desalination is affected by two major factors, thermodynamics and kinetics. The thermodynamic factors mainly depend on the material properties of the electrode and the adsorption value of the isotherm. The kinetic factors mainly depend on the speed of electron migration, convection and diffusion. The movement rate of metal atoms caused by the flow of electrons under unit field strength depends on the speed of the electron migration trajectory. The size of the working flow determines the strength of the convection effect, and the diffusion coefficient is the basis of the diffusion effect. The diffusion coefficient of bicarbonate is low, and the alkalinity is expressed by bicarbonate. This paper studies the relationship between different bicarbonate concentrations and electrosorption desalination. The results show that the bicarbonate alkalinity has a great influence on the desalination performance of the electro-absorption equipment and the removal effect of chloride ions, total hardness and bicarbonate alkalinity. When processing high bicarbonate alkalinity water, bicarbonate ions chemically react with calcium and magnesium ions in the water to form crystalline scales on the electrode plate, resulting in a decrease in the salt rejection rate. When treating low-concentration bicarbonate alkalinity water, the electro-absorption equipment has the function of automatically dissolving crystalline scales, which improves the desalination performance. Through this experiment, it is found that bicarbonate alkalinity is the main reason for the fouling of the electrode plates of the electro-adsorption equipment.
作者
房睿
常玉婷
FANG Rui;CHANG Yu-ting(Hydrological Bureau of Xinjiang Uygur Autonomous Region,Urumqi 830000,Xinjiang,China;Ecological Environment Monitoring Station of Xinjiang Uygur Autonomous Region,Urumqi 830000,Xinjiang,China)
出处
《地下水》
2022年第1期151-154,共4页
Ground water
关键词
重碳酸盐碱度
电吸附
电子迁移
Bicarbonate alkalinity
electrosorption
electron migration
