2Resultsanddiscussion
The overall effects of the CW treatment on the wastewater are shown in Table 1. Through comparing indicators before and after treatment, we concluded that the water quality was improved to a safe level. The ANOVA results are shown in Table 2 with COD, TP, TN and transparency as indicators. 2.1RemovalrateofCOD The COD was reduced from 270 to 96 mg/L with a removal rate of 64.44% (Table 1). Fig.4 also shows that Table1 Effects of constructed wetlands treatment on wastewater from