Abstract: The effect of ion exchange resins with different ionic groups on the separation of L-Lac- and L-Glu- from fermentation wastewater was investigated by resin static adsorption, conventional electrodialysis and packed-bed electrodialysis. The results of static adsorption showed that the selective adsorption ratio of L-Lac- and L-Glu- adsorbed by basic resins (201′7 and WA30) was higher than that adsorbed by acid resins (001′1.1 and WK10). Compared with conventional electrodialysis, the migration quantity and separation ratio of L-Lac- and L-Glu- in the dilute compartments filled with 001′1.1 (strong acid resin) and WK10 (weak acid resin) were obviously higher, the maximal separation ratio could reach 22.22 when the 001′1.1 resin was filled in the dilute compartment of electrodialysis. However, when the basic resins (201′7 and WA30) were filled in the dilute compartment, both migration quantity and separation ratio were lower than those of conventional electrodialysis, the maximal separation ratios of L-Lac- and L-Glu- in the concentrated compartments were 5.74 and 8.28 separately. The migration quantities and separation ratio of L-Lac- and L-Glu- and energy consumption in different electrodialysis systems showed that 001′1.1 and WK10 resins filled in the dilute compartments were beneficial to the separation of L-Lac- and L-Glu- in packed-bed electrodialysis.

Key words: packed-bed electrodialysis, lactic acid, glutamic acid, separation

摘要： 通过树脂静态吸附、常规电渗析及填充床电渗析的对比实验，考察了带有不同离子交换基团的树脂对发酵废液中L-Lac-和L-Glu-分离的影响. 结果表明，碱性树脂201′7和WA30对2种组分的静态吸附量、L-Lac-/L-Glu-选择吸附比例均比酸性树脂001′1.1和WK10大. 与常规电渗析相比，填充001′1.1(强酸型)、WK10(弱酸型)的填充床电渗析体系中L-Lac-和L-Glu-的跨膜迁移量及分离比例均有明显增加，填充001′1.1时分离比例最大可达22.22. 填充201′7(强碱型)时两组分跨膜迁移量及分离比例均比常规电渗析小，最大分离比例分别为5.74和8.28. 填充不同离子交换树脂体系的能耗对比表明，填充床淡室中填充树脂001′1.1和WK10时可促进L-Lac-和L-Glu-的迁移传递、提高二者的分离比例.

关键词: 填充床电渗析, 乳酸, 谷氨酸, 分离