Study On Phytoremediation Of Nitrogen And Phosphorus-Polluted Water

In this paper, I consider Eichharnia crassipes that have economic value and Hosta ventricosathat have ornamental value as the pilot plant materials, Two plants will be planted in differentnitrogen and phosphorus pollution of water for experiments. Analysis the repair effects of the twoplants in different nitrogen and phosphorus pollution water and the changes of physiologicalindicators of two plants, we can get the following conclusions:1. In phytoremediation conditions, the nitrogen concentrations have decreased in varyingdegrees all treatment in a single nitrogen pollution water, the downward trend roughly the same, inthe 1-11 day trial period nitrogen concentration in water falling very fast, In 11-15 day of testingthe nitrogen concentrations in water decreased gradually came to a moderate speed. Theaccumulation of nitrogen in two plants increased with the nitrogen concentration in water. In alltreatments, the removal of nitrogen and the accumulation in vivo of nitrogen in Eichharniacrassipes are greater than Hosta ventricosa. The results showed that in nitrogen pollution water, the repair results of Eichhornia crassipes is better than Hosta ventricosa.2. In phytoremediation conditions, the phosphorus concentrations have decreased in varyingdegrees all treatment in a single phosphorus pollution water, . The downward trends of havedifferences. Throughout the trial period, in the water that TP concentration of 0.031mg/L and0.0155mg/L, the concentration of phosphorus reduced very fast. And in the water that TPconcentration of 31mg/L and 155mg/L, 1-11-day period of total phosphorus concentrations inwater reduced faster, in 11-15 days gradually become calm. The accumulation of phosphorus intwo plants increased with the phosphorus concentration in water. In all treatments, removal rate ofphosphorus and phosphorus accumulation in vivo of Eichharnia crassipes are greater than Hostaventricosa. The results showed that in phosphorus pollution water, the repair results of Eichhorniacrassipes is better than Hosta ventricosa.3. In the restoration conditions of Eichhornia crassipes, in the water that the concentration ofnitrogen is 21mg/L and the concentration of phosphorus is 155mg/L, during 1-10 day theconcentrations of nitrogen fall fast, after 10 days becoming gentle, In Hosta ventricosa repairconditions, throughout the trial period the concentration of total nitrogen in water reduced quickly.in the water that the concentration of nitrogen is 21mg/L and the concentration of phosphorus is155mg/L, the nitrogen removal rate of Hosta ventricosa is higher than Eichharnia crassipes, andthe plants accumulate nitrogen ratio of Hosta ventricosa is higher than Eichharnia crassipes andthe difference between two plants is very significant. It showed that in this treatment the removal of nitrogen of Hosta ventricosa is better than Eichhamia crassipes. The removal of phosphorus andthe phosphorus accumulation in vivo of Eichhamia crassipes is the higher than Hosta ventricosa, the difference between two plants is very significant..It showed that in the treatment thephosphorus removal of Eichharnia crassipes is better than Hosta ventricosa. In the water that theconcentration of nitrogen is 210mg/L and the concentration of phosphorus is 31mg/L, As theEichharnia crassipes wilt in the test 11 days, there is no comparison of the two plants.4. Both of Eichharnia crassipes and Hosta ventricosa can grow normally in a single nitrogenand phosphorus stress condition, The higher the concentration of nitrogen and phosphorus in waterthe higher the chlorophyll content and dry matter content in plants, it means the growth of plants isgood, This proves that Eichhamia crassipes and Hosta ventricosa has a very strong ability to adaptin a single nitrogen and phosphorus pollution water, they can be used for repairing a singlenitrogen and phosphorus pollution water. In nitrogen and phosphorus mixed pollution water, in thewater that the concentration of nitrogen is 21mg/L and the concentration of phosphorus is155mg/L, Eichharnia crassipes and Hosta ventricosa can grow normally. In the water that theconcentration of nitrogen is 210mg/L and the concentration of phosphorus is 31mg/L, thephysiological indicators of Hosta ventricosa is good but the physiological indicators of Eichhomiacrassipes is worse than the other treatment and the root of Eichharnia crassipes was rot when itwas planted in the 7th day, and on the 11th day the plants wilt symptoms, it noted that thistreatment affected the growth of Eichharnia crassipes.