Typical Behavior Of Bisphenol A In Drinking Water Treatment Via Different Methods

It has been reported that BPA has estrogenic activity and acute toxicity toward aquatic organisms and human cultured cells (Nakagawa and Tayama, 2000). It has also been detected that the pollution of BPA can be created when using BPA to manufacture other compounds and products including releases from many current commodities. Because of BPA was widely used in the world,BPA can pollute the surface water and the groundwater through lots of ways.While the surface water is the most important water source of drinking water, the human race face the risk to be direct or indirect exposed under BPA. And as some report,even employed the chlorination and ozonization during the drinking water treatment,BPA can still be detected in the outlet.Thereout the drinking water conventional treatment confront the new challenge.In this study, three typical behaviors of BPA in drinking water conventional treatment was investigated including: behavior in PAC coagulation, adsorption behavior on active carbon, degradation in aqueous medium by ozone.The goal of this study is to objective assessment the transformation and fate of BPA during the drinking water conventional treatment.So that to provide the theoretical base for effective controlling the EDCs in drinking water.Jar tests were performed to test the removel efficiency of BPA and the coagulating properties in water coagulation process with polyaluminum chloride (PAC) as coagulant. When the concentration of organic matter and turbidity was low in the solution, the experimental results showed that the removal of BPA increased firstly and subsequently decreased with the PAC dosage increasing. That means we can find the optimal PAC dosage theoretically, and the optimal PAC dosage is found at BPA/PAC=1:2.6(M/M) at our experiment conditions. It is found that BPA could be removed by PAC coagulation fairly efficiently at pH 6.0~8.0, attributed to the charge-neutralizing mechanism by polynuclear aluminous salts in the solution. The humic matters and the turbidity matters in the solution have significant effect on BPA removal by PAC coagulation. The BPA removal will be weakened at high humic matters .And the removal rate of BPA increased firstly and subsequently decreased with the turbidity increasing.The adsorption capacity , adsorption kinetics and impact factors of endocrine disrupting chemicals ( EDCs) bisphenol A (BPA) in water on granular activated carbon (GAC) were investigated in this study. The results showed that high BPA adsorption capacity could be achieved by GAC. Moreover, the experiment results of adsorption isotherm fitted Freundlich model.The variation of adsorption capacity was influenced by particle diameter of GAC. By the comparison between different adsorption kinetics, it could be drawn that pseudo second order model could be used to simulate the adsorption process effectively.This study investigated the process and the mechanism of BPA degradation in aqueous medium by ozone.The modern spectroscopy was employed to analysis the degradation product and degradation pathway.The influence factor include ozone dosage, initial concentration, ozonation time and ozone adding time was investigated. Result of experiment shows ozonation can not make BPA total degradated but only some mixture of byproduct .And the concentration of this byproduct is cumulated during the reaction time.