Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, 310058, China.
Engineering Research Center of Urban Underground Development of Zhejiang Province, Hangzhou, 310058, China.
Sci Rep. 2019 Sep 3;9(1):12698. doi: 10.1038/s41598-019-49050-y.
Laboratory model tests were conducted in constant-voltage mode and constant-current mode for the one-dimensional electro-osmotic treatment of dredged sediment, with an approximately consistent initial electric power. The voltage, current, drainage rate, electro-osmotic transport volume, and energy consumption coefficient during the electro-osmotic process were measured and calculated. After treatment, the final soil moisture at designated positions in the test samples was measured to investigate the effects of different power supply modes. Further, the divergent phenomena observed with constant voltage and constant current were discussed. Based on an analysis of the measured energy consumption coefficients with time, we obtained a linear relationship between the applied/equivalent voltage and energy consumption coefficient. Furthermore, the electro-osmotic processes are divided into four stages by equal drainage quantity to obtain the energy consumption and electro-osmotic transport volume under different working conditions. The results reveal that the energy consumption of electro-osmosis is mainly determined by the applied voltage or the equivalent voltage for dredged sediment, while the value of electro-osmotic transport volume depends mainly on the change in soil water content rather than power supply modes. The drainage rate in constant-current mode was observed to be relatively steady, maintaining an approximately constant rate until the soil moisture was dramatically reduced. In other words, constant-current mode shows the advantages of being powerful and persistent in electro-osmotic treatment.
实验室模型试验在恒压模式和恒流模式下进行，对疏浚泥沙进行一维电渗处理，初始电功率大致一致。测量并计算电渗过程中的电压、电流、排水量、电渗输送体积和能耗系数。处理后，测量试验样品中指定位置的最终土壤水分，以研究不同供电模式的效果。进一步讨论了恒压和恒流观察到的发散现象。基于对随时间测量的能耗系数的分析，我们得出了施加/等效电压与能耗系数之间的线性关系。此外，通过等排水量将电渗过程分为四个阶段，获得不同工况下的能耗和电渗输送体积。结果表明，电渗能耗主要取决于疏浚泥沙的施加电压或等效电压，而电渗输送体积值主要取决于土壤含水量的变化，而不是供电模式。恒流模式下的排水量被观察到相对稳定，在土壤水分急剧减少之前保持大致恒定的速率。换句话说，恒流模式在电渗处理中具有强大而持久的优势。
