This paper provides a combined method of iron chips deacidized and biological degradation in which deals with the biotrans formation azo dyes waste water draining from dye works.

• 采用铁屑还原与生物降解相结合的方法；处理印染厂排出的难生化性偶氮类染料废水；设备简单；投资小；处理效果好.；该法对中小型印染厂适用性