Selective recovery of copper from electroplating wastewater by biogenic sulfide precipitation in a bench-scale batch reactor system
Precipitation of valuable metals from wastewater using biogenic sulfide offers interesting potentials for selective recovery due to different solubility product of each metal. In this study, separate recovery of copper from an electroplating wastewater containing copper, nickel, zinc and iron was tested using a bench-scale batch reactor system via continuous gas sparging mode. At pH 1. 9, selective copper precipitation efficiency exceeding 99％ was achieved within 120 min in this treatment system, resulting in a residual copper concentration < 0. 4 mg/L. During the whole copper precipitation process, nickel, zinc and iron did not precipitate. Copper precipitates produced in the reactor were identified as CuS and Cu9Sg by XRD and the particle size distribution of CuS and Cu9S8 was between 8. 5 -23. 8 |xm. At pH 3. 0 and 4. 5, the precipitation efficiencies of zinc, nickel and iron did not exceed 36％ and 9％ and 0.5％ , respectively, due to insufficient supply of sulfide. The selective copper precipitation system developed in this study is a promising first step toward a pilot-scale electroplating wastewater treatment plant with a high capacity to produce metal-sulfides as potential resources reused for the metallurgical industry.
metal recovery biogenic sulfide Cu precipitation electroplating wastewater
Di Fang Ruichang Zhang
College of Environmental Science and Engineering, Ocean University of China, 266100, Qingdao, China
国际会议
The 19th International Biohydrometallurgy Symposium(第19届国际生物湿法冶金大会 IBS2011)
长沙
英文
904-907
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）