Abstract：
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, Fe3O4 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 Fe3O4 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 Fe3O4 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.
摘要：
由于世界范围内产生的大量食物垃圾(FW)需要高处理能力。通过厌氧发酵将FW转化为挥发性脂肪酸（VFAs）是一项有前途的技术；但是，在高负载下很容易抑制VFA的产生。在这项研究中,Fe3O4用于提高高负载FW厌氧发酵中VFAs的产量，所涉及的机制在微生物水平上被揭示。结果表明，在高负载（底物与接种物（S/I）比为3）下，Fe3O4显着提高了微生物的VFAs产量和VFAs生产率160％。Fe3O4的增强作用主要是由于颗粒/可溶性有机物的加速水解，富集的水解和产酸菌，和乳酸菌的相对丰度降低。本研究为高负荷下FW的高效处理提供了新的思路,性能和经济效益有待进一步研究，以供实际应用。
