Effects of Ph and Illumination on Removing Nitrogen and Phosphorus in Eutrophic Water by Purple-Root Water Hyacinth

Phytoremediation is the most commonly selected option for decontaminating the nutrients in eutrophic water bodies in recent years. In the present study, the effects of pH and illumination time on removing nitrogen and phosphorus by purple-root water hyacinth were investigated. The results indicate that there would be a better removal rates of nitrogen and phosphorus under the condition of pH=6~7 and t=8~10 h. Both acid and alkali conditions would slow down the purification effects and increasing illumination time can not improve the removal rate remarkablely. Therefore, it provides an important theoretical foundation for the efficient use of purple-root water hyacinth to restore eutrophic water bodies.