Mechanism of combination membrane and electro-winning process ontreatment and remediation of Cu2+ polluted water body
ZHANG Linnan , WU Yanjun , QU Xiaoyan , LI Zhenshan , NI Jinren
DOI:
Received July 04, 2008,Revised December 08, 2008, Accepted , Available online
Volume 21,2009,Pages 764-769
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Mechanism of treatment and remediation of synthetic Cu2+ polluted water body by membrane and electro-winning combination
process was investigated. The influences of electrolysis voltage, pH, and electrolysis time on the metal recovery efficiencies were
studied. Relationship between trans-membrane pressure drop ( P), additions ratio, initial Cu2+ concentration on operating efficiency,
stability of membrane and the possibility of water reuse were also investigated. The morphology of membrane and electrodes were
observed using scanning electron microscopy (SEM), the composition of surface deposits was ascertained using combined energy
dispersive X-ray spectroscopy (EDX) and atomic absorption spectrophotometer. The results showed that using low pressure reverse
osmosis (LPRO), Cu2+ concentration could increase from 20 to 100 mg/L or even higher in concentrated solutions and permeate water
conductivity could be less than 20 μS/cm. The addition of sodium dodecy/sulfate sodium dodecyl sulfate improved Cu2+ removal
efficiency, while EDTA had little side influence. In electro-reduction process, using plante electrode cell, Cu2+ concentration could
be further reduced to 5 mg/L, and the average current efficiency ranged from 9% to 40%. Using 3D electrolysis treatment, Cu2+
concentration could be reduced to 0.5 mg/L with a current efficiency range 60%–70%.
