Experimental Studies On The Removal Of Endocrine Disrupter Bisphenol A In Water By Micellar-enhanced Ultrafiltration

Micelle-enhanced ultrafitration(MEUF) is a brand-new water treatment of membrane technology, its research started the 60th of last century. This technology combined the surfactant with the ultrafitration membrane, it is suitable for remove the minim metal ion and the organic contaminate which molecular weight less than 300, it is a high efficiency and practicality water treatment for low-grade polluted water.In this article the solubilization rate of surfactants on bisphenol A was tested by ultraviolet adsorption spectroscopy. The results indicate that the sequence of solubilization rate in turn is cetylpyridinium chloride and sodium dodecyl benzene sulfonate, the partition coefficients (Kmc) are 4.06 and 3.99 respectively. In order to improve the solubilization rate of surfactants on bisphenol A, nonionic surfactants and electrolyte were added to SDBS and CPC respectively. The results demonstrate that this method does improve the solubilization rate of surfactants on bisphenol A.Studies were carried out for the removal of bisphenol A from aqueous solutions by using Micellar-Enhanced Ultrafiltration Technique (MEUF). The micellar enhanced ultrafiltration of BPA in synthetic wastewater using two polysulfone membranes of 1000 and 5000 dalton molecule weight cut-off (MWCO), one regenerated cellulose membrane of 1000 dalton molecule weight cut-off was studied. Experiments were performed as a function of an anionic surfactant sodium dodecyl benzene sulfonate, an cationic surfactant cetylpyridinium chloride and three nonionic surfactants TritonX-100, Tween-80 and alkyl poly-glycosides.The effects on the removal efficiency of bisphenol A, the permeate flux, permeate concentrations of SDBS and CPC of various factors in the practical application of MEUF were studied, including the nature of membranes, surfactant and BPA concentrations, operating pressure, stirring time and setting time before the time of ultrafiltration, stirring rate at the time of ultrafiltration, electrolyte and solution pH.It was found that: There were not great different between using polysulfone membranes of 1000 dalton molecule weight cut-off and regenerated cellulose membrane of 1000 dalton Da molecule weight cut-off to the removal efficiency of bisphenol A, while the permeate concentration of surfactant is lower and the permeate flux is higher when we used polysulfone membranes of 1000 dalton molecule weight cut-off. Stirring rate at the time of ultrafiltration, stirring time and setting time before the time of ultrafiltration which have a few effect on the removal efficiency of bisphenol A. The operating pressure presents important influence on the permeate flux of the ultrafitration, while it has little effect on the removal efficiency of bisphenol A. The removal efficiency of bisphenol A using CPC is to be superior the removal efficiency of bisphenol A using SDBS. The optimal concentration of the SDBS is 24mmol/L, at this condition the removal efficiency of bisphenol A is 79.92%; The optimal concentration of the CPC is 5mmol/L, the removal efficiency of bisphenol A is 93.79% at this condition. The existence of electrolyte can improve the removal efficiency of bisphenol A and reduce the concentration of surfactant in permeation solution obviously. The solution pH has great and different effect on the nature of MEUF to anionic surfactant and cationic surfactant. The anionic-nonionic system is to be superior in the rejection of bisphenol A and SDBS to the pure anionic system, the preferential order is Tween-80, TritonX-100 and alkyl poly-glycosides; The cationic-nonionic system is to be superior in the rejection of bisphenol A and CPC to the pure cationic system, the preferential order is TritonX-100, Tween-80 and alkyl poly-glycosides...