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首页> 外文期刊>Separation and Purification Technology >The effect of varying transmembrane pressure and crossflow velocity on the microfiltration fouling of a model beer
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The effect of varying transmembrane pressure and crossflow velocity on the microfiltration fouling of a model beer

机译：跨膜压力和错流速度的变化对模型啤酒微滤结垢的影响

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Experiments were conducted to determine the fouling propensity during crossflow filtration of a model beer,primarily composed of dextrin and protein.The Carbosep~? filters of nominal pore size 0.45 mum were fouled over a range of transmembrane pressures and crossflow velocities at a constant temperature of 20 deg C.After each experiment,the membrane was cleaned and re-used in order to replicate industrial filtration conditions.For each experiment,the flux decline data were obtained,together with the concentrations of the dextrin and protein in the permeate and retentate streams.Further data manipulation enabled retention ratios to be calculated for each component.The permeate flux was shown to decrease with filtration time during the development of the fouling layer.Once the fouling layer was established,the permeate flux became constant for a given set of experimental conditions.The steady-state flux increased with increasing transmembrane pressure and with increasing crossflow velocity.For a given crossflow velocity,an increase in transmembrane pressure resulted in a reduction in transmission of both the BSA protein and dextrin components of the model beer.This is attributed to an increase in the fouling layer thickness due to higher permeate fluxes,coupled with a decrease in fouling layer voidage at higher transmembrane pressures.The retention data suggest that higher transmembrane pressures lead to an increase in the proportion of BSA present in the fouling layer.For a given transmembrane pressure,an increase in crossflow velocity led to increased transmission of both the BSA and dextrin through the membrane.This is due to the inhibition of fouljng layer development through the larger wall shear stress and thinner laminar sub-layer that are associated with an increase in crossflow velocity.
机译：进行了实验以确定交叉啤酒滤过的模型啤酒的结垢倾向，该模型啤酒主要由糊精和蛋白质组成。在20摄氏度的恒定温度下，在一定范围的跨膜压力和错流速度下，将名义孔径为0.45微米的过滤器结垢。每次实验后，将膜清洗并重复使用以重复工业过滤条件。 ，获得通量下降数据，以及渗透液和截留液中糊精和蛋白质的浓度。进一步的数据处理可以计算出每种组分的保留率。在开发过程中，渗透通量随着过滤时间的增加而降低。一旦建立了污垢层，在给定的一组实验条件下渗透通量就变得恒定。稳态通量随着跨膜压力的增加和错流速度的增加而增加。对于给定的错流速度，在一定的错流速度下，渗透率增加。跨膜压力导致BSA蛋白和糊精组分的传递减少型号啤酒。这归因于较高的渗透通量导致结垢层厚度的增加，以及跨膜压力较高时结垢层空隙率的降低。保留数据表明较高的跨膜压力会导致结垢层的比例增加。结垢层中存在BSA。对于给定的跨膜压力，错流速度的增加导致BSA和糊精通过膜的传输增加，这是由于较大的壁剪切应力和更薄的壁厚抑制了结垢层的发展与错流速度增加相关的层状子层。

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