By adding hammer scale and 30% H_2O_2 to cation dye waste water, and then stirring it for 15mins, it can make decoloring ratio of the waste more than 99%.

• 在阳离子染料废水中加入废铁屑及30%25H_2O_2,搅拌15分钟,废水脱色率达99%25以上。