| dc.description.abstract | Low concentration electroplating wastewater comes from washing processes in soft copper foil substrate industry. For reclamation of such water, the recovery is usually not good because the influent copper concentration varies significantly, which results in high treatment cost and possible pollution to the aquatic environment. In this study, ion exchange was proposed to remove copper before reverse osmosis (RO) to stabilize the water quality for water reclamation system.
The results showed that when solution pH was 3 and the specific volume was 13.5, the exchange ability of the ion exchange resin was 1.76 eq/L-R; that is, 55.5 g-Cu/L- resin. The removal efficiency of copper was up to 99%. Compared to the traditional treatment (e.g., chemical precipitation), the cost was 18% cheaper. The regeneration of resin gave copper concentration of 14.5 g/L, which was about 1160 times of the required influent copper concentration (i.e., 12 mg/L). The long-term test also showed that the exchange ability of the resin used in this work was not degraded.
Incorporation of ion exchange in water reuse system can effectively lower the copper concentration and, thus, lead to stable operation of the RO. The reductions of sludge and wastewater lessen the pollution of electroplating industry. Moreover, water reclamation from wastewater ease the pressure for water demands.
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