Abstract: Static experiment of septic tank wastewater treatment have been carried out by adopting florating soilless culture of Garden Canna ( Canna generalis ), Swamp morningglory ( Iponoea aquatica ), Rice ( Oryza sativa ) and Wild Rice ( O. sativa ). The results showed that the COD, BOD 5 , TN and TP removal rates of the four plant treatments were all higher than that of the control. The results of an integrated assessment on the purification efficiency of the four plant species on the bases of purification capacity, lodging resistance, management, comprehensive utilization and landscape indicated that the purification efficiency of Garden Canna ranked the first followed by Swamp morningglory, rice and wild rice. 

Key words: floating soilless culture, Garden Canna, Swamp morningglory, water treatment, septic tank wastewater