“…Therefore, new methodologies have been developed for the removal of these contaminants (Bloodworth et al, 1993;Li et al, 2013), such as flotation (Maynard et al, 1969;Raghavan et al, 2004), chemical treatment by chlorination (González & Ruiz, 2006), treatments with inorganic acids (Hernández-Hernández et al, 2015), organic acids (Ma & Li, 2006), organic bases (Pentrák et al, 2018) and reducing agents (Panzhong et al, 2010), microbiological treatments (Shelobolina et al, 2005), thermal processes (Chen et al, 2014), magnetic methods (Li et al, 2013) and electrochemical techniques (Lu et al, 2006;Flores-Segura et al, 2012).…”