摘要
为研究正渗透(FO)浓缩过程中的膜通量衰减规律,本文以牛血清白蛋白(BSA)为特征污染物,研究了正渗透过程中原料液的离子强度及BSA浓度、膜方位等参数不同时FO膜的污染规律,以提高膜通量和截留率为目标,对驱动液的种类、浓度,料液流速进行了优化,并优化了适宜的膜清洗方案。结果表明:原料液中离子强度越大,FO膜的初始通量越低,但随着运行时间的延长,原料液BSA中含有盐离子时FO膜的通量高于纯BSA溶液的通量。BSA浓度越低,膜污染越轻,且FO模式(13.82±3.2 L/m^(2)·h)的水通量高于PRO模式(5.08±2.1 L/m^(2)·h),表明宜采取FO模式进行浓缩。在最佳操作条件下,即以1.5 mol/L NaCl为驱动液并控制料液流速为2.89 m/s时,FO膜通量达11.23±2.13 L/m^(2)·h,BSA截留率97.83%,反向溶质通量Js为0.14 mol/m^(2)·h。使用0.05%NaOH浸泡膜表面4 min,通量恢复率98.39%,多次使用及重复清洗后恢复率仍达98%以上,表明该膜具有良好的耐清洗性能,本研究将为从食品物料中回收蛋白质提供一定的技术参考。
In order to study the attenuation regularity of membrane flux in the process of forward osmosis(FO)concentration, the fouling rule of FO membrane affected by different parameters including ionic strength, BSA concentration in the feed and membrane orientation was studied with Bovine serum albumin(BSA) as the primary typical pollutants. In order to improve the membrane flux and rejection rate, the type and concentration of draw solution and the flow rate of feed solution were optimized and the appropriate membrane cleaning scheme was optimized. The results showed that the initial flux of FO membrane decreased with the increasing of ionic strength in feed solution, but the flux of FO membrane with BSA solution containing salt ions was higher than that of pure BSA solution as the running time went on. The lower the concentration of BSA, the lighter the membrane fouling was, and the water flux in FO mode(13.82±3.2 L/m^(2)·h) was higher than that in PRO mode(5.08±2.1 L/m^(2)·h), which indicated that FO mode should be adopted for concentration. Under the optimal operating conditions, the 1.5 mol/L NaCl as the draw solution and the flow rate of both feed and draw solution controlled at 2.89 m/s, FO flux was 11.23±2.13 L/m^(2)·h, BSA retention rate was 97.83%, and reverse solute flux Js was 0.14 mol/m^(2)·h. After the fouled membrane was immersed in 0.05% NaOH for 4 min, the flux recovery rate reached 98.39% and the flux recovery rate was still exceed 98% after reusing and cleaning many times, which indicated that the membrane had good cleaning resistance. This study would provide a certain technical reference for protein recovery from food materials.
作者
隋世有
金丽梅
朱成成
李志江
薛立新
SUI Shiyou;JIN Limei;ZHU Chengcheng;LI Zhijiang;XUE Lixin(College of Food Science,Heilongjiang Bayi Agricultural University,Daqing 163319,China;Heilongjiang Engineering Research Center for Coarse Cereals Processing and Quality Safety,Daqing 163319,China;National Coarse Cereals Engineering Research Center,Daqing 163319,China;Center for Membrane Separation and Water Science&Technology,College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China)
出处
《食品工业科技》
CAS
北大核心
2022年第10期64-72,共9页
Science and Technology of Food Industry
基金
黑龙江省优势特色学科资助项目(黑教联[2018]4号)
FO分离膜性能测试及汲取液种类开发(2020003)。
