School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China; Jiasixie Agronomy College of Weifang University of Science and Technology, Shouguang 262700, China.
School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China.
J Biotechnol. 2023 Sep 10;374:114-121. doi: 10.1016/j.jbiotec.2023.08.003. Epub 2023 Aug 12.
As a renewable carbon source produced from organic wastes by acidogenic fermentation, volatile fatty acids (VFAs) are important intermediates in chemical and biological fields and beneficial to resource recovery and carbon neutrality. Maximizing VFA production by some strategies without additional chemicals is critical to increasing economic and environmental benefits. In this study, the effects of initial organic load (OL) on the performance of VFA production, variations of intermediate metabolites, and the thermogravimetric properties of potato peel waste (PPW) during batch acidogenic fermentation were studied. The results showed that the concentration of VFAs increased with the increase of initial OL, while the VFA yield decreased with the increase of initial OL. When the initial OL was in the range of 28.4 g VS/L-91.3 g VS/L, the fermentation type of PPW was butyric acid fermentation. The highest butyric acid proportion of 61.3% was achieved with the initial OL of 71.5 g VS/L. With the increase of initial OL, the proportion of acetic acid and the utilization rate of protein in the PPW decreased. VFAs were produced from proteins and carbohydrates in the early stage and mainly produced from carbohydrates in the later stage. The production efficiency of VFA was relatively high with the initial OL of 71.5 g VS/L, because more easily-biodegradable compounds were solubilized. The results showed that suitably increased initial OL could accelerate acidogenesis, reduce hydrolysis time, and increase the proportion of butyric acid. The findings in this work suggest that PPW is a promising feedstock for butyric acid biosynthesis and appropriate initial OL is beneficial to VFA production.
作为一种由产酸发酵从有机废物中产生的可再生碳源，挥发性脂肪酸（VFAs）是化学和生物领域的重要中间体，有利于资源回收和碳中性。在不添加其他化学物质的情况下，通过一些策略最大限度地提高 VFA 产量，对于提高经济和环境效益至关重要。在这项研究中，研究了初始有机负荷（OL）对 VFA 生产性能、中间代谢产物变化以及批式产酸发酵过程中马铃薯皮废物（PPW）热重特性的影响。结果表明，VFAs 浓度随初始 OL 的增加而增加，而 VFA 产率随初始 OL 的增加而降低。当初始 OL 在 28.4 g VS/L-91.3 g VS/L 范围内时，PPW 的发酵类型为丁酸发酵。当初始 OL 为 71.5 g VS/L 时，丁酸比例最高，达到 61.3%。随着初始 OL 的增加，乙酸比例和 PPW 中蛋白质的利用率降低。VFAs 是由蛋白质和碳水化合物在早期产生的，主要是由碳水化合物在后期产生的。在初始 OL 为 71.5 g VS/L 时，VFA 的生产效率相对较高，因为更多的易降解化合物被溶解。结果表明，适当增加初始 OL 可以加速产酸，缩短水解时间，提高丁酸的比例。这项工作的结果表明，PPW 是丁酸生物合成的一种很有前途的原料，适当的初始 OL 有利于 VFA 的生产。
