Characterization Parameters in the Heavy Metal Electrokinetic Removal Process of the Fly Ash

Abstract

Electrokinetic removal is a new kind of technology and it is paid close attention in many countries. This work shows the laboratory results of electrodialytic removal experiments about the fly ash from municipal solid waste in Chongqing. The characterization parameters of the electrolyte solution pH, electric current, electrical conductivity, voltage gradient were discussed after the experiment. The pH value changed smoothly in the cathode compartment, while it changed abruptly in the first 6 hours, but it changed smoothly in the rest time in the anode compartment. The electrical current increased in the first 50 hours, then gradually decreased in the rest time. The higher the electrical current is, the better the removal effect is. The electrical conductivity in the anode compartment increased while the electrical conductivity decreased in the cathode compartment. The higher the electrical conductivity is, the better the removal effect is. The metal hydroxide precipitation was the most serious factor that influenced the removal rate.