Abstract: The mine acid wastewater produced in the production process of a copper mine enterprise is treated by engineering in Fujian Province.The wastewater is characterized by high acidity and excessive concentration of iron, copper, aluminum, zinc and other heavy metals.Direct discharge will cause great harm to the environment.In order to reduce the impact of pollutants in wastewater on the environment, this project adopts high-density sludge method to treat acidic sewage through adjusting the reaction pH 6.8-7.0, and carrying out a certain proportion of sludge reflux.The effluent shall meet the emission standard of pollutants for copper, nickel, cobalt industry(GB 25467—2010).