Recovery of EDTA from Power Plant Boiler Chemical Cleaning Wastewater

Recovery of copper and chelating agents from sludge extracting solutions

“…Additionally, to keep treatment costs low, it is necessary to achieve a cleanup so that the heavy metal can be recovered, and it should be possible to reuse the chelant for further extraction cycles. The electrochemical reduction process can remove metal ions from the synthetic solution and field samples and can deposit elemental metals on the cathodic plate to enable EDTA to be recovered for reuse from power plants [18,19]. But they are affected by several operating problems, e.g., membrane fouling and degradation [20].…”

Recovery of Cu(II) by chemical reduction using sodium dithionite

“…Electrochemical reduction of metals was proved to be an effective method for treating ligand/metal-containing wastewater (Huang et al, 2000;Voglar and Lestan, 2012). While metal is reduced and removed by cathode-deposition in electrochemical process, ligands are degraded simultaneously in anode, making reuse of these ligands impossible.…”

Removal of Pb by EDTA-washing in the presence of hydrophobic organic contaminants or anionic surfactant

“…Inner-sphere surface complexation of heavy metal ions, which is more relevant to Pb sorption in field settings than ion exchange and surface precipitation, involves proton exchange with hydroxyl groups on soil minerals (e.g. Al, Fe and Mn oxides and clay minerals) or functional groups economically feasible with acceptable environmental risk in a number of studies on the recovery of added EDTA and heavy metals from washing effluents [10][11][12][13][14], most of these previous studies, however, primarily focused on soils contaminated with heavy metals only. Instead, according to statistical data of Compensation, and Liability Act Information System by USEPA in 2003 [15], 67 % sites on the National Priority List were contaminated by both heavy metals and organic contaminants.…”