Near-anode focusing phenomenon caused by the coupling effect of early precipitation and backward electromigration in electrokinetic remediation of MSWI fly ashes.

Abstract

As electrokinetic remediation (EKR) is used to remediate contaminated soil, the focusing phenomenon is always the inevitable problems needing to be solved during the process. In this paper, EKR was chosen to extract the heavy metals in the municipal solid waste incineration fly ashes (FAs). The focusing phenomenon of FA in the sample region of the rectangular electrolyser was comprehensively studied. The formation of the focusing band was monitored and the redistribution of concentration for Zn, Pb, Cu, and Cd were displayed. The major and minor phases of FA particles have greatly changed before and after the experiment. A variety of carbonate hydroxides and phosphate were found at the end o..