Removal of ions in nickel electroplating rinse water using low-pressure nanofiltration
- Removal of ions in nickel electroplating rinse water using low-pressure nanofiltration
- 안규홍; 송경근; 차호영; 염익태
- Nanofiltration; Wastewater reuse; Nickel electroplating; Rinse water; Ion rejection
- Issue Date
- VOL 122, 77-84
- This study investigated the performance ofnanofiltration (NF), which is more economic than reverse osmosis (RO) and requires lower pressure for the removal of cations and anions in simulated nickel electroplating rinse water environments. Removal rates according to changes in basic parameters such as pressure, crossflow velocity, pH, ion types and ion concentrations were observed. In single-salt system experiments NF removed more Ni 2÷ in NiSO 4 solution than in NiC12 solution. As concentration increased in single-salt systems, removal rate of sulfate salts and some chloride salts (in the system with cations of+l valency) decreased, whereas chloride salts with cations of+2 valency increased. In the experiment with multi-salt systems, the removal rate of ions showed a logarithmic increase with pressure until 3 kgf/cm 2 (0.294MPa), and beyond this value the removal rate stabilized. Change in crossflow velocity did not affect the ion removal, but change in pH was a significant factor for C1- removal rate. Furthermore, the removal rate of Clwas heavily dependent on the amount of SO 2- present in the same system. In experiments using simulated nickel electroplating rinse water below a pressure of 3 kgf/cm 2, the removal efficiencies of ions increased greatly with increased influent salt concentration and pressure, whereas beyond 3 kgf/cm 2, the removal efficiency stabilized. This result indicated that 3 kgf/cm 2 is the optimum pressure for NF application against nickel electroplating rinse water.
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