大蒜浆液超滤中膜污染的研究

本文研究了不同操作条件下,大蒜浆液超滤过程中渗透流量随时间变化的关系;考察了蒜蛋白等大分子在不同超滤膜中的吸附特性,进一步确定了这些大分子在超滤膜中的吸附对渗透流量的影响.实验结果表明:通过搅拌可迅速提高大蒜浆液在超滤过程中的渗透流量;采用亲水膜作为超滤膜比采用疏水膜的效果更为显著,亲水膜对蒜蛋白等大分子的作用力及吸附量也比疏水膜小,较适合于大蒜油萃取工艺中的破乳过程;大蒜油在渗透液中的浓度及膜污染程度都受料液pH 值影响,最适宜的 pH 值约在4.5附近.

A Study on Membrane Fouling in Ultrafiltration of Garlic Solution

The changes of permeate flux with time in ultrafiltration of garlic solution und different operation conditions are studied.The adsorption of maeromolecules in the gar- lic solution,such as proteins,pectins etc,on different kinds of membranes are also in- vestigated in order to determine the effect of macromolecular adsorption for membra- nes on permeate flux.The results show that there is a rapid increase in permeability with stirring.The recovery of hydraulic permeability is much larger for hydrophilice membranes than hydrophobic membranes whitch appear to retain garlic proteins,Pectins- etc,more strongly.The experimental results also indicate that the hydrophobic mem- branes have larger equilibrium amount of maeromolecules adsorbed than hydrophilic membranes which seems to be more suitable for the process of garlic oil recovery. Both garlic oil concentration in permeate and membrane fouling are strongly pH depen- dent,the best pH for this process seems to be at pH 4.5.