Department of Chemical and Environmental Engineering, Khalifa University of Science and Technology, Masdar Institute, Masdar City P.O. Box 54224, Abu Dhabi, United Arab Emirates; UFZ - Helmholtz-Centre for Environmental Research, Department of Environmental Microbiology, Permoserstrasse 15, 04318 Leipzig, Germany.
Department of Chemical and Environmental Engineering, Khalifa University of Science and Technology, Masdar Institute, Masdar City P.O. Box 54224, Abu Dhabi, United Arab Emirates.
Bioresour Technol. 2017 Aug;238:416-424. doi: 10.1016/j.biortech.2017.04.057. Epub 2017 Apr 20.
Carboxylic acid production from food waste by mixed culture fermentation is an important future waste management option. Obstacles for its implementation are the need of pH control, and a broad fermentation product spectrum leading to increased product separation costs. To overcome these obstacles, the selective production of lactic acid (LA) from model food waste by uncontrolled pH fermentation was tested using different reactor configurations. Batch experiments, semi-continuously fed reactors and a percolation system reached LA concentrations of 32, 16 and 15gCOD/L, respectively, with selectivities of 93%, 84% and 75% on COD base, respectively. The semi-continuous reactor was dominated by Lactobacillales. Our techno-economic analysis suggests that LA production from food waste can be economically feasible, with LA recovery and low yields remaining as major obstacles. To solve both problems, we successfully applied in-situ product extraction using activated carbon.
利用混合培养发酵从食物垃圾中生产羧酸是一种很有前景的未来废物管理选择。其实施的障碍在于需要 pH 值控制，以及广泛的发酵产品谱导致增加了产品分离成本。为了克服这些障碍，使用不同的反应器构型，通过不受控 pH 值发酵，从模型食物垃圾中选择性地生产乳酸（LA）。分批实验、半连续进料反应器和渗滤系统分别达到了 32、16 和 15gCOD/L 的 LA 浓度，COD 基准选择性分别为 93%、84%和 75%。半连续式反应器以乳杆菌目为主。我们的技术经济分析表明，从食物垃圾中生产 LA 具有经济可行性，但 LA 回收和低产量仍然是主要障碍。为了解决这两个问题，我们成功地使用活性炭进行了原位产物提取。
