Abstract:

Horizontal flow constructed wetland system　was used to treat the micro-polluted water resource after sedimentation. The contamination removal efficiency and effect of plants in the wetland treatment system were studied, The results of treatment experiment showed that the average removal efficiencies of chemical oxygen demand(COD),total phosphorus (TP), total nitrogen(TN) and ammonium nitrogen(NH4+-N) were 49.89%,50.44%, 53.41% and 48.45% in the horizontal flow constructed wetland system respectively. At same time, The study on plant of the constructed wetland indicates that it can be clearly observed that the plants removed the nitrogen and phosphorus directly by absorption, and this process performed better in the growing season of plants. The plants on the foreside of the bed grew better than those grew on the rearward, and they can also absorb more nitrogen and phosphorus. On the other hand, the pollutants in the raw water were filtrated and absorbed by the plants’ roots. The roots also provided a habitat for the microorganism and then, the microorganism played a degradation function on the pollutant, which had a significant effect in the constructed wetland systems.