The Purifying Effect of Polluted Water by the Aquatic Plants

In order to study aquatic plants on the effects of polluted water purification,five kinds of aquatic plants as an object for study,including Acorus tatarinowii、Hydrocotyle vulgaris、Myrtophllum spicatum、Ceratophyllum demersum and Potamogeton distinctus were used by water culture method in the artificial climate chamber to study its purification effect. The experimental results show that: the experimental aquatic plants have a good cleaning effect on the polluted water,it can be used as water purification plants ,which Acorus tatarinowii and Hydrocotyle vulgaris had a better effect on removing nitrogen,Ceratophyllum demersum、Myrtophllum spicatum and Hydrocotyle vulgaris had a good removal on phosphorus; after seven weeks growing the five the aquatic plants Acorus tatarinowii、Hydrocotyle vulgaris、Myrtophllum spicatum、Ceratophyllum demersum and Potamogeton distinctus for total nitrogen( TN) removal were 86. 22% 、91. 13% 、79. 69% 、83. 17% and 65. 51% respectively,for total phosphorus( TP) removal were 87. 94% 、92. 09% 、92. 61% 、95. 20% and 85. 87% apart; the removal of phosphorus in the polluted water was better than nitrogen,so the speed. Therefore,it can put these aquatic plants as the preferred plant on the constructed wetland,which supported scientific basis for selection the constructed wetland plants and decrease the level of nutrition in the sewage water.