Transport characteristics and removal efficiency of copper ions in the electrodialysis process under electroconvection operation

摘要

Three distinct operational conditions, namely, ohmic, limiting current, and electroconvection region, respectively, can be created by applying different electric fields during ED operations. The fundamental of cation transport under ohmic and limiting current is well understood, however, the mechanism on cation transport under electroconvection is unclear. In order to clarify the feasibility of operating ED under electroconvection for the treatment of industrial wastewater (copper ion as the target pollutant), the methods of current-voltage profiling (C-V curve) and electrochemical impedance spectroscopy (EIS) were used to study the transport characteristics of Cult through a cationic exchange membrane (CEM). The relevant operational parameters obtained above under electroconvection conditions were applied to a continuous ED system as to investigate the removal efficiency of Cu2+-containing wastewater.