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Effect of the zeta-potential on the micro/ultra-filtration of yeast suspensions using ceramic membranes

机译：ζ电位对使用陶瓷膜对酵母悬浮液进行微/超滤的影响

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The influence of the zeta-potentials(zeta-potentials)of membranes and particles in the micro/ultra-filtration of yeast suspensions is investigated.Cylindrical ceramic micro-filtration(MF)and ultra-filtration(UF)membranes were used in this studyalumina and zirconia membranes being used for MF and UF,respectively.The zeta-potentials of particles and membranes were determined and the results used to select the test conditions for the filtration experiments.Choice of appropriate test conditions allows assessment of the importance of changed electrokinetic properties of the membranes and particles in the filtration process.The electrokinedc properties of membranes and particles were altered by changing the pH and electrolyte concentration.The zeta-potentials of ceramic membranes depend on the pH,the ionic strength of the electrolyte seems of lesser importance.The zeta-potential of yeast particles seems to depend on the concentration of electrolyte aluminium sulphate(Al_2(SO_4)_3)and to a much lesser extent on pH.Changes in the size distribudon of suspensions of yeast particles suggest that they are flocculated in the presence of Al_2(SO_4)_3.In MF,the best permeate flux is found when Al_2(SO_4)_3 is used and this seems independent of pH.In contrast,in UF the control of pH is the significant factor and the aluminium concentration has a lesser effect.Generally,the best permeate fluxes are found when the yeast is flocculated.The interactions between particles and membranes are important in filtration and the choice of membrane material can influence the optimal conditions for use.Thus,electrokinetic measurements can play an important role in membrane characterisation.
机译：研究了膜和颗粒的ζ电势（zeta-potentials）对酵母悬浮液的微滤/超滤的影响。本研究采用圆柱形陶瓷微滤（MF）和超滤（UF）膜分别用于MF和UF的氧化锆膜和氧化锆膜。确定了颗粒和膜的ζ电位，并将结果用于选择过滤实验的测试条件。选择合适的测试条件可以评估改变电动特性的重要性通过改变pH值和电解质浓度可以改变膜和颗粒的电性质。陶瓷膜的ζ电位取决于pH值，电解质的离子强度似乎不太重要。酵母颗粒的ζ电位似乎取决于电解质硫酸铝（Al_2（SO_4）_3）的浓度和酵母颗粒悬浮液的大小分布变化表明它们在Al_2（SO_4）_3的存在下絮凝。在MF中，当使用Al_2（SO_4）_3时，渗透通量最佳。相反，在超滤中，pH的控制是重要因素，而铝浓度的影响较小。通常，当絮凝酵母时，发现最佳的渗透通量。颗粒与膜之间的相互作用对过滤和膜材料的选择会影响最佳使用条件。因此，电动测量在膜表征中起着重要作用。

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