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Control of protein (BSA) fouling by ultrasonic irradiation during membrane distillation process

机译：膜蒸馏工艺超声辐射对蛋白质（BSA）污染

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摘要

Ultrasonic irradiation was introduced into membrane distillation process and the influence of ultrasonic irradiation on protein (bovine serum albumin, BSA) fouling control was investigated. Although the initial BSA concentration did not affect permeate flux in experimental ranges, the feed concentration increasing caused permeate BSA raise due to partial wetting of the hydrophobic membrane. The ultrasonic irradiation could enhance permeate flux about 20% without modification of the hydrophobicity/hydrophilicity of BSA in feed. The higher the concentration factor was, the larger the ultrasonic enhancement of permeate flux could be. Severe permeate flux decline can be found when the salt CaCl2 was added into the BSA solution. The presence of Ca2+ would aggravate membrane fouling because the BSA molecules interacted with each other via salt bridging and formed BSA-Ca complex. The BSA aggregates scattered on membrane surface and resulted in a dense fouling layer. With ultrasonic irradiation, ultrasonic wave refreshed liquid-membrane interface continuously and alleviated the deposition of BSA aggregates. Therefore, although there were still some small foulant aggregates scattered on membrane surface, most of the membrane pores kept open and clean, the relative permeate flux can maintain about 98% and was hardly affected by concentration factor increasing. (C) 2016 Elsevier B.V. All rights reserved.
机译：将超声辐射引入膜蒸馏过程，研究了超声辐射对蛋白质（牛血清白蛋白，BSA）污染对照的影响。尽管初始BSA浓度在实验范围内没有影响渗透剂通量，但由于疏水性膜的部分润湿，饲料浓度增加导致渗透物BSA升高。超声波照射可以增强约20％的渗透助焊剂，而不会改变饲料中BSA的疏水性/亲水性。浓度因子越高，渗透磁通量的超声波增强越大。当将盐CaCl 2加入到BSA溶液中时，可以发现严重的渗透助焊剂。 Ca2 +的存在会加重膜污垢，因为BSA分子通过盐桥接和形成BSA-Ca络合物彼此相互作用。 BSA聚集体散射在膜表面上并导致致密的污垢层。通过超声波照射，连续超声波刷新液体膜界面，缓解了BSA聚集体的沉积。因此，虽然仍有一些散射在膜表面上的小污垢聚集体，但大多数膜孔保持打开和清洁，相对渗透磁通量可以保持约98％并且几乎不会受到浓度因子的影响。 （c）2016年Elsevier B.v.保留所有权利。

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