The average removal rate of COD_Mn, SS and the colour of the wastewater is 77.8%, 75.9% and 82.6% in the purple soil, and 96.0%, 86.5% and 97.0% in the red soil.

• 废水的COD_(Mn)、SS和色度的平均去除率在紫色土壤中是77.；8%25、75