Studies on Eutrophicated Water Quality Improvement by Three Kinds of Hydrophytes

With Oxalis triangularis,Eichhornia crassipes and Pistia stratiotes as the planting stuff,studied their growth status and the purification effect on the three differents eutrophic water,and investigated their capability to remove total phosphorous(TP),total nitrogen(TN) and ammonia nitrogen(NH3-N).The results showed that three kinds of hydrophytes in eutrophic water can normally grow and develop.The removal rate of TP respectively reached 93.58%,97.72%,96.65% by Pistia stratiotes,89.57%,83.76%,86.54% by Oxalis triangularis,90.11%,85.07%,91.46% by Eichhornia crassipes;the results of removal efficiency for TN respectively reached 89.05%,90.18%,73.50% by Pistia stratiotes,68.32%,59.73%,72.90% by Oxalis triangularis,68.45%,71.49%,71.53% by Eichhornia crassipes;The removal efficiency for NH3-N respectively reached 85.80%,91.48%,88.60% by Pistia stratiotes,77.51%,72.07%,89.68% by Oxalis triangularis,68.84%,90.90%,90.88% by Eichhornia crassipes.The experiments proved the three kinds of hydrophytes can abviously improve the quality of the eutrophic water.The integrated analysis of all indices indicate that in different eutrophic water,the purification effect of Pistia stratiotes was the best,Eichhornia crassipes take second place.