利用模拟苹果汁体系探究正渗透浓缩技术

Study on forward osmosis technology using simulated apple juice system

浓缩苹果汁不仅能够解决苹果的堆积腐败、贮存问题,还是生产饮料的重要基础配料,可应用于果酒酿制、化妆品及药品添加剂。为了更好地探究正渗透体系中苹果汁糖组分对浓缩性能和反向渗透扩散(reverse solute flux,RSF)的影响,实验对模拟苹果汁体系进行了研究。首先通过改变膜操作模式对模拟体系进行研究,再探究功能性汲取液对模拟苹果汁体系的浓缩能力,分别测定水通量、反向溶质扩散以及浓缩倍数等。结果表明,压力延迟渗透模式的水通量较高,反向渗透较少,比正渗透模式更有利于正渗透浓缩苹果汁;相较于传统的氯化钠汲取液,柠檬酸钠汲取液汲水能力更强,RSF更小,可大大提高果汁浓缩效率。

Apple juice concentration made consumers’daily consumption convenient and it was a useful way to overcome the problems of apple accumulation,corruption and storage.The energy consumption,high operation and membrane fouling were serious disadvantages of the traditional technologies.Forward osmosis(FO)was a new membrane concentration technology with the characters of low energy consumption,low membrane pollution and sustainable development.However,reverse solute flux(RSF)was the key challenge of FO technology.In order to explore the effect of apple juice components on the concentration performance and RSF in FO system,the simulated apple juice system was used as raw material in this study.Firstly,the simulation system was studied by changing the operating mode of the membrane.And then,the concentration ability of functional draw solution in the simulated apple juice system was investigated.The results showed that the water flux of the PRO mode was higher than the FO mode,to the contrary,RSF of the PRO mode was less than the FO mode.For the concentration of apple juice in FO system,the PRO mode was more conducive than the FO mode.Compared with NaCl draw solution,the sodium citrate draw solution had higher water flux and less RSF,improving the concentration efficiency of apple juice.