ABSTRACT
The production of free metal ions and metal hydroxides can cause an effect such as chemical coagulation, which can remove heavy metal ions from water solution. This is an indirect approach to heavy metal decontamination. This chapter presents electrochemical technologies according to the nature of the operations. It discusses reduction and oxidation reactions resulting from applied electricity. In order to design an electrochemical deposition process for precious metal recovery, it is desirable to have a model to describe the metal recovery as a function of operational parameters. A case study on the recovery of copper and silver was conducted. It was demonstrated that the electrochemical approach is able to recover multicomponent metal ions from the solution. The electrochemical cell arrangement for electroflotation is generally with two horizontal electrodes: one anode and one cathode. Electrochemical combined with the electroflotation process is an electrochemical technology that can be used for heavy metal removal.
