A comparative study on removal efficiency of four submerged plants on phosphorus and nitrogen in eutrophic water under different planting density

Submerged plants are commonly used in water purification and ecological restoration.The removal rates of four common submerged plants on nitrogen and phosphorus in the water of Houtan Park were analyzed through 30 days laboratory simulation and determination under six different planting densities.The results show that four submerged plants have significantly high removal rates of excessive nitrogen and phosphorus in eutrophic water.Removal efficiency of total nitrogen(TN)by Hydrilla verticillata reaches the highest 65%under planting density of 3 g·L~(-1),and the highest removal efficiency of total phosphorus(TP)by Potamogeton malaianus reaches 88%.Within the planting density range of 0.5 g·L~(-1)-3 g·L~(-1),the removal rates of total nitrogen and phosphorus in four submerged plants increased with increasing planting density.