Abstract:

According to acid leaching with thickener overflow water at low pH and high concentration of heavy metal ions in certain gold smelter，we compared the results and feasibility of different methods including film processing method，ion exchange resin method as well as sulfide precipitation for removing Cu，Cd，Ni and other metal ions in waste water during gold smelting and recycling gold in water samples in this study. The results showed that metal and nonmetal ions content in muddy water was nearly double when applying the membrane technology to deal with the overflow of water，but filtration procedure was time-consuming on the whole；When resin adsorption method was employed to separate As，Au from water samples，we cannot obtain expected results，however，other elements with low content can be absorbed by resin effectively.The results of sulfide precipitation method were better than other mentioned methods，nevertheless，the method combined with oxygen，activated carbon adsorption section can sufficiently remove arsenic.Overall，it can be concluded that combination of the three methods is feasible economically for wastewater discharge and wastewater reuse in some gold smelters.

Key words: wastewater treatment, membrane technology, ion exchange resins, sulfide precipitation