Abstract: KN－R simulated wastewater is treated by using manganese oxides extracted from spent zinc－manganese dry battery and MnO2 respectively. The experimental results show that the initial pH value is the key factor affected decolorization. The removal efficiencies of color are over 75 ％ under the conditions of pH＝2.0, dosages of manganese oxides and MnO2＝80 mg／L, reaction time＝30 min. It is found that the decolorization effect of wastewater using manganese oxides treatment is superior to that of wastewater using MnO2 treatment, which provides a new way of resource utilization of spent dry battery.

Key words: stimulated dyeing wastewater, decolorization, spent dry battery, manganese oxides, MnO2