In addition to the metal material extraction and purification methods of pre-processed mixture from PV module manufacturing wastes which have been introduced in Section 3.1, several other methods have also been proposed for the treatment of pre-processed metal- rich materials from end-of-life thin-film PV modules. According to [60], after the leaching treatment of disposed CdTe cells, the obtained solution containing CIGS materials is directly electrolyzed to first deposit Cu and Se and then Cd with after the electrode changed.