Removal Of Typical Environmental Hormone By Modified Ultrafiltration Membrane In Water Research

With the shortage of water resources and water pollution problem is increasingly serious and people's emphasis on drinking water safety, the water quality of drinking water safety problem has more and more be taken seriously. Since the development of China's early to ignore the problem of water pollution, result in source water quality appeared serious problems, although the traditional water treatment process can remove part of the Escherichia coli, colloidal substances and suspended material in the water, but for organic substances in water environmental hormone removal effect is not obvious. So using membrane separation technology, especially of environmental hormones in the ultrafiltration membrane technique to remove water increasingly attention.Triclosan and triclocarban as one kind of environmental hormone substances, although the presence of low dose on the human body without harm, but the use of a large number of, through bioaccumulation can of algae in water environment, biological impact, thereby affecting human health.Polyvinylidene fluoride(PVDF) used in the experiment, polyvinyl pyrrolidine(PVP) precipitation phase transformation method for preparation of modified ultrafiltration membrane and graphene oxide in immersion. Modified ultrafiltration membrane mass ratio: PVDF mass fraction of 20wt% ~ 24wt%, the mass fraction of PVP in the 2.44wt%, the mass fraction of graphite alkylene oxide in 0.81wt%. Modified ultrafiltration membrane flux was increased by 18 times, the interception rate decreased about 10%, still can meet in Escherichia coli, the removal of colloidal substances and organic matter. The laboratory test device and miss filter shaker apparatus respectively for dynamic membrane interception the adsorption experiment and static adsorption experiments, removal experiment of water three chlorine and three chlorine. And compares the two kinds of membrane under different initial concentration of typical removal efficiency of environmental hormones.Analysis found that, in the experiments, the modified ultrafiltration membrane removal effect of the environmental hormone in the water than before modified ultrafiltration membrane removal effect is good, in the static experiment, the ultrafiltration membrane were of triclosan in water and acetone class static adsorption experiments, the oxidation of graphene modified ultrafiltration membrane of environmental hormones to remove effect is higher than that of PVDF ultrafiltration membrane effect, the results show that the ultrafiltration membrane under different initial concentration of environmental hormone in the adsorption rate is not affected; And in dynamic tests, the ultrafiltration membrane of triclosan and removal of the mixed solution of acetone card class found that ultrafiltration membranes prior to removal of high-intensity mixture of card class; Different initial concentration will affect the adsorption capacity of membrane, but the removal rate of the membrane and membrane flux decline is little impact; Ultrafiltration membrane to high levels of removal of the mixed solution in the balance of residual concentration than the low concentration of mixed solution remaining high concentration in the balance.Ultrafiltration membrane adsorption reaction plays a main role to eliminate the triclosan. The adsorption capacity of membrane is proportional to the initial concentrations of triclosan, the higher the concentration, the greater the adsorption capacity. Ultrafiltration membrane to the adsorption laws of triclosan follow the Freundlich adsorption isotherm, which is to use a variety of ultrafiltration membrane surface adsorption sites to adsorption reaction of triclosan, and is carried out in accordance with the proportion of 1:1 adsorption; In the process of ultrafiltration membrane adsorption, different initial concentrations of triclosan affects only the balance of the ultrafiltration membrane adsorption capacity and adsorption rate,does not affect the equilibrium adsorption rate, in line with the pseudo first order reaction kinetics characteristics..Finally, some suggestions are put forward for the further research work in this subject.