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For selecting macrophyte species in constructed wetland, the abilities to remove NH4+-N and TP in the artificial sewage of 10 macrophyte species were investigated by the manipulative indoor experiment. Macrophyte species which had stronger purification effect were selected, then, assemblies were designed to compare with the single ones. The results showed that the abilities of different macrophyte species to remove nitrogen and phosphorous contrast sharply with one another. Lythrum salicaria, Acorus calamus, Cann indica, Typha davidiana had stronger ability to remove NH4+-N, when treated for 15 days, with an original concentration of 29.69mg/L, the removal rates were 96.6%, 98.6%, 87.7%, 95.1% respectively. Cann indica, Eichhornia crssipes, Lythrum salicaria, Acorus tartarinowii had stronger ability to remove TP, when treated for 15 days, with an original concentration of 4.44mg/L, the removal rates were 99.0%, 54.6%, 69.9%, 36.7%, respectively. In respect of the removal rates of NH4+-N and TP, the assembly of Lythrum salicaria and Acorus tartarinowii (54.2%, -32.6%) did better than Lythrum salicaria(28.7%, -41.5%,), which indicated that the assembly could improve purification effect of NH4+-N and TP simultaneously. The assembly of Lythrum salicaria and Cann indica, the assembly of Acorus calamus and Cann indica, the assembly of Acorus calamus and Lythrum salicaria, the assembly of Cann indica and Acorus tartarinowii, all the assemblies had stronger removal abilities of TP than the single ones. The results of the investigation into selection and assembly of aquatic macrophyte species suggested that, proper assemblies could improve the purification effect of NH4+-N and TP in wastewater in comparison with the single ones.

Selection and assembly of macrophyte species in constructed wetland for purification of N and P in wastewater