陶瓷膜对脱脂乳中酪蛋白与其他组分的高效分离

Efficient Separation of Casein and Other Components from Skim Milk by Ceramic Membrane

量化200 nm陶瓷膜脱除乳清蛋白、乳糖、灰分和钙的能力。在50℃条件下,对脱脂乳进行3倍浓缩,之后连续2次补水至原体积进行稀释过滤,浓缩倍数均为3,最终得到3次滤液,计算各组分总脱除率。结果表明乳糖脱除率为85.81%,α-乳白蛋白脱除率为79.27%,β-乳球蛋白脱除率为71.64%,灰分脱除率为62.16%,钙脱除率为35.64%。稀释过滤完毕后膜的纯水膜通量衰减系数为89.27%,使用质量分数为2%氢氧化钠和0.5%的硝酸溶液进行清洗,膜通量的恢复系数为99.07%。

In this study, our objective was to quantify the capacity of a ceramic microfiltration （MF） membrane with a pore size of 200 nm to remove whey proteins, lactose, ash and calcium from skim milk. Skim milk was concentrated three times by microfiltration at 50 ℃ and then the resulting retentate was diluted to the original volume followed by three-fold concentration under the same conditions as for skim milk. The same treatment was performed on the retennate obtained from the second microfiltration. During the whole process, the cumulative removal percentages of a-lactalbuminn, p-lactoglobulin, lactose, ash and calcium calculated from the three filtrates obtained were 79.27%, 71.64%, 85.81%, 62.16%, and 35.64%, respectively. After the second filtration, the pure water flux of the membrane was reduced 89.27%, and the membrane flux was recovered to 99.07% of the initial level after cleaning the membrane with 2% NaOH and 0.5% nitric acid solution.