Guo Yan, Li Chenglong, Zhao Hongjun, Gao Ming, Wang Qunhui
Department of Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China.
Department of Environmental Engineering, Tianjin College, University of Science and Technology Beijing, Tianjin 301830, China.
Membranes (Basel). 2023 Feb 27;13(3):280. doi: 10.3390/membranes13030280.
Fermentation broth is plentiful with lactic acid, an important chemical applied in many fields, such as food processing, the chemical industry, and cosmetics. However, the purification of the lactic acid from the broth is still troublesome, when considering the economy. This study first investigated the purification performance of microfiltration (MF) membrane technology for a fermentation broth from kitchen waste. The effect of operation pressure, broth pH, and membrane flushing mode on the membrane filtration performance were investigated. In addition, the change in filtration performance over the increase in cycle time was also investigated. The results showed that under the optimum pressure of 100 KPa, pH of 6.0, and a backflushing mode with deionized water for 3 min, the best performance was achieved, with chroma removal, turbidity removal, protein removal and total sugar removal efficiencies of 60, 92.8, 57.64 and 32.93%, respectively. The results indicated that the MF process could be a desirable broth purification process to some extent, and it is promising in actual application. The MF process combined with other post-purification processes will form the ideal process system, which should be explored in future research.
发酵液中富含乳酸，乳酸是一种应用于食品加工、化工和化妆品等众多领域的重要化学品。然而，从发酵液中提纯乳酸在经济方面仍存在困难。本研究首先考察了微滤（MF）膜技术对厨余垃圾发酵液的提纯性能。研究了操作压力、发酵液pH值和膜冲洗方式对膜过滤性能的影响。此外，还研究了过滤性能随循环时间增加的变化情况。结果表明，在100千帕的最佳压力、6.0的pH值以及用去离子水进行3分钟的反冲洗模式下，可获得最佳性能，色度去除率、浊度去除率、蛋白质去除率和总糖去除率分别为60%、92.8%、57.64%和32.93%。结果表明，微滤工艺在一定程度上可能是一种理想的发酵液提纯工艺，在实际应用中具有前景。微滤工艺与其他后提纯工艺相结合将形成理想的工艺体系，这有待在未来研究中进行探索。
