Micellar-enhanced ultrafiltration process (MEUF) for removing copper from synthetic wastewater containing ligands.
The effects of the type and concentration of ligands on the removal of Cu by micellar-enhanced ultrafiltration (MEUF) with the help of either anionic or cationic surfactants were investigated. The removal efficiency of copper by anionic surfactant-(SDS-) MEUF depends on the ligand-to-Cu ratio and the ligand-to-Cu complexation constant. At fixed ligand-to-Cu ratio, the Cu removal efficiency decreases in the order of citric acid>NTA>EDTA, which is the reverse order of Cu-ligand complexation constants for these ligands. Increasing SDS-ligand ratios from 12 to 60 at fixed ligand concentration did not improve copper removal efficiency. The cationic surfactant, CPC, enhances Cu removal efficiency in systems with condition of ligand-copper ratios higher than 1.0, where Cu removal is not very efficient using SDS-MEUF process. The Cu removal efficiency with CPC-MEUF depends on both the ligand-to-Cu ratio and the type of ligands.
Liu
Chuan-Kun
CK
Department of Water Resources and Environmental Engineering, TamKang University, 151 Ying-Chuan Road, Tamsui 25137, Taipei Hsien, Taiwan, ROC.
Li
Chi-Wang
CW
Lin
Ching-Yu
CY
D019343:Citric Acid / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D004492:Edetic Acid / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008024:Ligands; D008823:Micelles; D009571:Nitrilotriacetic Acid / Q000737:chemistry; D013054:Spectrophotometry, Atomic; D013501:Surface-Active Agents / Q000737:chemistry; D014462:Ultrafiltration / Q000379:methods; D014865:Waste Disposal, Fluid / Q000379:methods*
D008024:Ligands; D008823:Micelles; D013501:Surface-Active Agents; D019343:Citric Acid; D003300:Copper; D004492:Edetic Acid; D009571:Nitrilotriacetic Acid