The Research For Removal Efficiency Of Low Concentration BPA In Aquatic Environment By Several Aquatic Plants

Endocrine disruptors (EDCs) can come into human or animal's body,interact with the receptors of cells,then destroy normal metabolism, secretion and reproductive function. Bisphenol A (BPA) is a common endocrine disruptors, which is harmful to human's body and other creature.It is a global problem that BPA widely exist in water,soil and food.Phytoremediation—It's a alternative technique of bioremediation using plants to remove the pollutants in soil and water.The object of phytoremediation is heavy metal, organic pollutions or radioactive elements existed in soil and water. The types of phytoremediation include phytostabilization,rhizofiltration,phytoaccumulation,phytodegration,phyto volatilization and evapotraspriration. With merits of low cost and friendly to environment, phytoremediation have a potential of widely application in pollution control.In this paper,the removal efficiency of several common aquatic plants to removal low concentration of BPA in aquatic environment was studied. Firstly, several common aquatic plants were choosed to investigate the removal efficiency of low concentration BPA in water. The results show that Hydrilla verticillata and Elodea Canadensis had good removal efficiency. In static experiments, when the initial level of the BPA was 100ug/L,the removal efficiency of Elodea Canadensis achieved the level of 83.19% within 4 days,while the remocal efficiency of Hydrilla verticillata and Potamogeton crispus respectively achieved 75.91%和67.57%,and the efficiency of Ceratophyllum demersum L was 57.26%.In dynamic experiments,when the hydraulic retention time (HRT) was 24h, after 3 days of the treatment,the removal efficiency achieved 74.03%. To avoid the influence of BPA adsorption caused by sediment,the efficiency of Elodea Canadensis in water without sediment was investigated too. It was found that when the initial concentration of BPA was 100μg/L, the removal efficiency of BPA continued increase, after 9 days of the treatment,the removal efficiency had been achieved 93.32%.This paper also investigated the efficiency of Elodea Canadensis under different biomass, results show that the removal efficiency of Elodea Canadensis was not affected by different biomass within some certain levels.