탈염전기투석에 의한 모사발효액으로부터의 암모늄 락테이트의 회수

Recovery of ammonium lactates from simulated fermentation broth by desalting electrodialysis

An experimental study was carried out on the recovery of ammonium lactate from simulated fermentation brothby desalting electrodialysis (DSED). All experiments, using AM-1 and CM-1 membranes, were operated in a constant current and a subsequent constant-voltage mode, and the switching point was determined based on the previous results. The effects of operating conditions such as operating current, initial feed concentration, and initial feed pH were investigated. Increased operating current resulted in a decreased operating time but an increased energy consumption per unit amount of ammonium lactate recovered. As the initial feed concentration was increased, the operating time increased while energy consumption decreased. The operating time and energy consumption slightly decreased as the initial feed pH was increased up to 6.0. However, no significant influences on the recovery of ammonium lactate were observed over 6.0. The rejections of acetate, glucose, and proteins were $10\%,\;93\%,\;and\;98\%$, respectively. Sulfate was not rejected at all.