Purification effects of indoor Myriophyllum elatinoides wetland system on ammonium nitrogen wastewater

In the present study, the ammonium nitrogen removal characteristics and nitrogen mass balance in indoor Myriophyllum elatinoides wetland system were analysis. The results showed after 28 days treatment with 200 and 400 mg·L-1 NH4+-N, the removal rates of total nitrogen (TN) and N H4+-N in artificial wastewater were 77.7% and 86.1% , 89.8% and 78.8%, respectively. According to the nitrogen mass balance, 14.7% and 30.2% of the exogenous N H4+-N were transformed into sediment N H4+-N and 25.3% and 11% of exogenous N H4+-N were transformed into sediment NO3-N by 200 mg·L-1 N H4+-N and 400 mg·L-1 N H4+-N treatments; 29.7% and 12.7% of exogenous N H4+-N was absorbed by M. elatinoides; 14.0% and 23.3% of exogenous N H4+-N became residual nitrogen in the water and 16.3% and 22.8% of exogenous N H4+-N eventually to nitrification and denitrification removal. The results suggested that M. elatinoides can effectively purify ammonium nitrogen which provides scientific basis for its application in artificial wetland.