Abstract:In order to reduce the cost of wastewater treatment and reduce the pressure of wastewater treatment, some wastewater with low pollutant content is classified and treated, and the surface water of sulfuric acid production in Guixi Smelter is part of it. After pretreatment, the surface water reaches the standard and can be sent to the external system or used for production water backwater treatment. In this study, aluminum sulfate solution and DTCR solution are used to treat surface water. The effects of pH of reaction solution and the amount of purifying agent on the purification effect are investigated. The optimum conditions for the purification reaction of aluminum sulfate solution are determined as follows: the pH of the reaction system is 8 and the addition amount of aluminum sulfate is 2ml/L. The optimum conditions for the purification reaction of DTCR solution are as follows: the pH of the reaction system is 9 and the addition amount of DTCR is 2ml / L. The results of validation experiments under the optimum process conditions show that the content of heavy metals in surface water treated with aluminum sulfate solution and DTCR solution respectively meets the requirements of national standard GB 25467—2010.Compared with the existing wastewater treatment process, it has the characteristics of short process, less chemicals, low cost and good effect.