基于电渗析技术的氨基酸发酵母液脱盐方法

The desalination of amino acids fermentation liquor based on electrodialysis

发酵法生产氨基酸的同时，也产生大量的发酵母液，这些母液中含一定的有机物质残留、少量的可溶性氨基酸以及大量盐类。实验通过改变电渗析操作条件，如脱盐溶液流量、电渗析电流密度等，探究氨基酸发酵母液电渗析脱盐的最佳条件，为工业废水的处理提供可行方法。得到结论：当电流密度为10～25mA／cm2之间时，电流密度越大，色氨酸回收率越低，脱盐率越高；当流量为20～60L／h之间时，流量越大，色氨酸回收率越低，对脱盐率的影响分阶段变化。得到最佳实验条件为：电流密度15mA／cm2、流量20L／h。

Fermentation mother liquor, as the by-product generated in the production process for amino acids, contains a large amount of organic material residual, salts as well as a small amount of soluble amino acids. In order to provide feasible methods in industrial wastewater treatment, our research aimed to determine the optimum condition of desalination of amino acid fermentation mother liquor based on the eleetrodialysis in different conditions, such as different flow and current density. It was concluded in this study that higher current density leaded to lower recovery of tryptophan and higher desalination rate when current density was between 10 and 25 mA/cm2. When the flow was from 20 to 60 L/h, larger flow leaded to lower recovery while the influence on desalination rate changed in different stages. When current density was 15 mA/cm2 and flow was 20 L/h, it came to the optimum condition of the experi- ment.