Effect of Planting Density on Purification of Eutrophic Water by Epipremnum aureum Floating Bed

eutrophication;  font-size: 10pt; ">ecological floating bed;  font-size: 10pt; ">Epipremnum aureum; planting density

In order to determine the optimal planting density of floating bed plants treating eutrophic water bodies, eutrophic wastewater prepared with lake water and a certain amount of nutrients was treated by a floating bed for 39 d, and the growth of plants and the purification effect of various pollutants were investigated. Epipremnum aureum, which has ornamental value and greening function, was selected as the floating bed plant under the outdoor conditions, and a self-designed and assembled ecological floating bed was used as a plant carrier. The decrease rates of DP, TN, TOC and conductivity (COND) had a positive correlation with the planting density. The higher the planting density was, the lower the increase rate in plant weight was observed, and the lower the chlorophyll a (Chl-a) concentration and algae densities in the water tank were detected. Profile of the algae density was consistent with that of Chl-a concentration, and a significant correlation existed between them. The optimal planting density was 3.13 g/L in the experiment, and the removal rates of TN and TOC were 96.8% and 84.6%, respectively. The improvement of treatment efficiency was not obvious if the planting density was too high.