Influence of Internal Aeration in Vertical Flow Constructed Wetland on Effluent Quality

[Objective] The research aimed to study influence of the internal aeration in vertical flow constructed wetland on effluent quality.[Method] The second level of wetland in Yinglong Sewage Treatment Plant as experimental site,influences of the vertical flow constructed wetland on the removal effects of CODCr,ammonia nitrogen and total phosphorus in domestic sewage under different aeration pressures and depths were studied.[Result] Internal aeration of the wetland could improve the removal efficiency of CODCr.Aeration could improve removal efficiency of the ammonia nitrogen at the deep layer(50 cm),but wasn't favorable for removal of the ammonia nitrogen at the shallow layer(25 cm).Dissolved oxygen had small influence on removal of the total phosphorus.[Conclusion] The research provided reference for actual application of the vertical flow constructed wetland by internal aeration.