Biological purification effect of nine aquatic plants on N and P from simulation wastewater

Through culturing aquatic plants on simulation wastewater,the removal capacities of total nitrogen,ammonia nitrogen,total phosphorus of nine aquatic plants were researched,and aquatic plants with good removal effect were screened out. With the increase of culture time,the removal rate of nine kinds of aquatic plants to three kinds of pollutants was gradually increased.At low concentrations,the removal rate of Alternanthera philoxeroides to ammonia nitrogen was the greatest(53.79%),the removal rate of Nelumbo nucifera to total nitrogen was the greatest(48.75%),the removal rate of Eichhornia crassipes to total phosphorus was the greatest(70.10%). In moderate concentrations,the removal rate of Eichhornia crassipes to ammonia nitrogen was the greatest(61.39%),the removal rate of Zizania latifolia to total nitrogen was the greatest(52.23%),and the removal rate of Eichhornia crassipes to total phosphorus was the greatest(80.15%).At high concentrations,the removal rate of Zizania latifolia to ammonia nitrogen was the greatest(55.70%),the removal rate of Eichhornia crassipes to total nitrogen and total phosphorus was the greatest(respectively for 40.42%,69.58%).Therefor,Eichhornia crassipes,Alternanthera philoxeroides,Zizania latifolia had good removal efficiency,and were better wetland plants.