Electrodialysis fermentation industry

FIG. 19 Schematic flow diagram for the production and purification of fermentation-derived acetic acid, as modified from Office of Industrial Technologies (2003). Unit operation identification items AF, anaerobic fermentation DI, distillation ED, electrodialysis EV, evaporation MF, microfiltration PV, pervaporation-assisted thermal cracking. 

Food industry and medical supplies Edible salt production from seawater,23 demineralization of whey,24 recovery of amino acids from fermentation liquor,25 separation of amino acids,26 preparation of lactic acid27, gluconic acid28 amino acids,29 etc. from their salts, stabilization of grape juice30 and pre-treatment of wine,31 deacidification of sour orange juice,32 desalination of soups, desalination of soybean sauce,33 continuous fermentation in the presence of electrodialysis,34 de-ionization of sugar solution.35... 

Many papers on continuous fermentation using electrodialysis have been reported.34 If ionic products produced in the fermentation broth amino acids, carboxylates, etc. are removed from the broth by electrodialysis, continuous fermentation becomes possible. The diffusion behavior of organic acids, such as, acetic, propionic, lactic, tartaric, oxalic, or citric acid through cation78 and anion79 exchange membranes has been studied in detail in connection with the removal of organic acids from the fermentation broth, and in applications in the food industry. 

The most important application of electrodialysis is the production of potable water from brackish water [82]. Avery special application is the reverse case, the production of salt. In the latter case the concentrate is the product stream whereas in the former case the diluate stream is the product. Moreover, there is an increasing number of industrial applications where ions have to be removed from.a process stream such as demineralisation of whey, deacidification of fruit juices, production of boiler feed water, removal of organic acids from a fermentation broth.lt is even possible to separate amino acids from each other as will be shown below. 

---