果实类中药水提液在反渗透过程中的临界渗透压及膜污染状况
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摘要
将临界渗透压(COP)引入果实类中药水提液反渗透过程的研究。以蒺藜、牛蒡子、山楂的水提液为研究对象,分析了渗透压与膜通量衰减率的关系。结果表明,反渗透过程中膜通量衰减率与渗透压呈正相关;不同体系的COP不同。选择药液渗透压小于、等于及高于COP的试验点,绘制反渗透过程中的阻力分布图。结果显示,浓差极化现象是造成膜污染的主要原因。根据4种堵塞模型的拟合结果,3种水提液的反渗透过程中膜污染特性均符合完全堵塞模型。
The application of critical osmosis pressure(COP) to the research of decotions of fructification herbs in reverse osmosis process was investigated. The relationship between the decline rate of flux and osmosis pressure of decotion was analyzed with the decotions of Tribulus terrestris L., Arctium lappa L. and Crataegus pinnatifida Bge.. The results showed that there was a positive correlation between the above two factors and the value of COP was changed according to the kinds of the herbal decotion. The contributions of membrane resistance at the point at which the osmotic pressure of the decotion was lower than, equal to or higher than COP were drawn. The results showed that the concentration polarization was the main cause of membrane fouling. Based on the filling results of four different blocking models, the characteristics of membrane fouling in the reverse osmosis process of the three decotions were all consistent with the complete blocking model.
The application of critical osmosis pressure(COP) to the research of decotions of fructification herbs in reverse osmosis process was investigated. The relationship between the decline rate of flux and osmosis pressure of decotion was analyzed with the decotions of Tribulus terrestris L., Arctium lappa L. and Crataegus pinnatifida Bge.. The results showed that there was a positive correlation between the above two factors and the value of COP was changed according to the kinds of the herbal decotion. The contributions of membrane resistance at the point at which the osmotic pressure of the decotion was lower than, equal to or higher than COP were drawn. The results showed that the concentration polarization was the main cause of membrane fouling. Based on the filling results of four different blocking models, the characteristics of membrane fouling in the reverse osmosis process of the three decotions were all consistent with the complete blocking model.
引文
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[2]严滨,林丽华,叶茜,等.反渗透技术在鼻炎康等中药提取液浓缩中的应用[J].膜科学与技术,2012,32(4):70-74.
[3]蔡邦肖,高玉琼.膜集成工艺浓缩灵芝水提液的研究[J].食品与发酵工业,2008,34(1):129-132.
[4]刘红波,李博,郭立玮.亚临界通量操作对黄连解毒汤超滤过程的影响[J].膜科学与技术,2013,33(3):81-87.
[5]Wang CX,Li Q,Tang H,et al.Membrane fouling mechanism in ultrafiltration of succinic acid fermentation broth[J].Bioresour Technol,2012,116:366-371.
[6]朱长乐.膜科学技术[M].2版.北京:高等教育出版社,2004:121-125.
[7]刘红波.不同膜组件对中药水提液膜过程的影响及其亚临界通量操作优化研究[D].南京:南京中医药大学硕士学位论文,2012.
[8]Koo CH,Mohammad AW,Suja F,et al.Use and development of fouling index in predicting membrane fouling[J].Sep Purif Rew,2013,42(4):296-339.
[9]Bolton G,La Casse D,Kuriyel R.Combined models of membrane fouling:Development and application to microfiltration and ultrafiltration of biological fluids[J].J Membrane Sci,2006,277(1-2):75-84.
[10]金唐慧,张刘红,朱华旭,等.反渗透浓缩对四逆汤物料体系理化参数的影响及其相关性研究[J].中国中药杂志,2014,39(8):1421-1425.