Wang Lanting, Lei Zhongfang, Yang Xiaojing, Zhang Chi, Liu Chang, Shimizu Kazuya, Zhang Zhenya, Yuan Tian
Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
Bioresour Technol. 2022 Nov;364:128097. doi: 10.1016/j.biortech.2022.128097. Epub 2022 Oct 10.
High treatment capacity for food waste (FW) is required due to the huge amount generated worldwide. Conversion of FW to volatile fatty acids (VFAs) via anaerobic fermentation is a promising technology; however, inhibition of VFAs production could easily occur at high loadings. In this study, FeO was used to enhance VFAs production in anaerobic fermentation of FW at high loading, and the mechanisms involved were revealed at microbial levels. Results showed that FeO significantly enhanced VFAs yield and VFAs productivity of microbes by 160% at high loading (substrate to inoculum (S/I) ratio of 3). The enhancement effect of FeO was mainly due to the accelerated hydrolysis of particulate/soluble organics, the enriched hydrolytic and acidogenic bacteria, and the reduced relative abundance of Lactobacillus. This study provides a new approach for the high-efficient treatment of FW at high loadings, while the performance and economic benefit should be further studied for practical application.
由于全球产生的食物垃圾（FW）数量巨大，因此需要对其具备高处理能力。通过厌氧发酵将食物垃圾转化为挥发性脂肪酸（VFA）是一项很有前景的技术；然而，在高负荷条件下很容易出现对挥发性脂肪酸产生的抑制作用。在本研究中，使用FeO来提高高负荷下食物垃圾厌氧发酵中挥发性脂肪酸的产量，并在微生物水平上揭示其中所涉及的机制。结果表明，在高负荷（底物与接种物（S/I）比例为3）时，FeO显著提高了微生物的挥发性脂肪酸产量和挥发性脂肪酸生产率，提高了160%。FeO的增强作用主要归因于颗粒/可溶性有机物水解的加速、水解和产酸细菌的富集以及乳酸杆菌相对丰度的降低。本研究为高负荷下食物垃圾的高效处理提供了一种新方法，不过在实际应用中还应进一步研究其性能和经济效益。
