Treatment of domestic sewage with integrated ABR and constructed wetland process

The combined process of anaerobic baffled reactor and constructed wetland was used to treat domestic sewage.The results showed that the optimum HRT for ABR was 12 hours and the average removal efficiency was 76%,while the HRT for constructed wetland was 4 days.The combined process showed excellent removal efficiency with COD 89%,BOD5 95%,SS above 95% and ammonia nitrogen 66.8%,and the effluent concentrations of COD,BOD5,SS and ammonia nitrogen were 42-51 mg·L-1,11.2 mg·L-1,9.1 mg·L-1 and 15 mg·L-1,respectively.Which could meet the I-class B criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB18918-2002).These results may provide useful information to the potential applications of the combined process of ABR and constructed wetland for sewage treatment at rural areas.