梯度纳米纤维膜在纯生啤酒中的除菌过滤研究OA

To address the problems of wide pore size distribution,poor fouling resistance,easy clogging,and poor reusability of sterilization commercially available filters for the filtration of pure draft beer,poly(vinyl alcohol-co-ethylene)(EVOH)nanofibers with two different diameter sizes were prepared by using the melt extrusion phase separation method,and a gradient structure nanofiber membrane was constructed by sequentially arranging coarse and fine nanofibers in the upper and bottom layers,respectively.The filtration performance,fouling resistance,and reusability of the gradient nanofiber membrane are investigated.It is found that the gradient nanofiber membrane has a stabilized flux of 22,660 L m-2h-1 after repeated filtration of 10 g/L yeast extract fermentation broth,which is much higher than that of the Pall®commercial membrane(4840 L m-2h-1).The stabilized flux of gradient nanofiber membrane after autoclaving treatment is 6600 L m-2h-1,compared to the commercial membrane which is 1760 L m-2 h-1,showing excellent high-temperature water vapor resistance.In addition,the flux recovery rate of the contami-nated gradient nanofiber membrane after 80 oC water rinsing is up to 43%,while the flux recovery rate of the com-mercial membrane is only 32%.The results show that the gradient nanofiber membranes have excellent reusabili-ty.This provides a new way for the localized replacement of sterilization filters for pure draft beer.