Chemical Engineering Laboratory, Faculty of Science and Centre for Advanced Scientific Research (CICA), University of Coruña, A Coruna, Spain.
Environ Technol. 2021 Nov;42(25):3889-3899. doi: 10.1080/09593330.2020.1743370. Epub 2020 Mar 31.
Agroindustry generates huge amounts of wastes leading to environmental problems in the zones where they are disposed. One of the strategies for the valorization of these wastes is the acidogenic fermentation used to produce volatile fatty acids. In this study, four agroindustrial wastes generated in different Spanish industries were selected for evaluating their acidogenic potential in batch assays. The selected wastes were potato solid waste, grape marc distilled, grape marc and brewery spent grain. Potato solid waste and grape marc presented the highest degree of acidification (69% and 54%, respectively) with the predominance of acetic, butyric and propionic acids in their VFA profiles. In the potato solid waste, the influence of two parameters, substrate/inoculum ratio and initial alkalinity added, on the degree of acidification and on the VFA profile was evaluated. The maximum VFA production (higher than 70% of the total COD added) was obtained at substrate/inoculum ratios of 1.5 and 2.8 g VS substrate g VS inoculum and at the highest concentration of initial alkalinity (3 g L as CaCO). Additionally, it was demonstrated that an increase of initial alkalinity, at all S/I ratios, can shift the VFA profile obtained, decreasing the relative amount of butyric and propionic acids and increasing the amount of acetic acid.
农业产业会产生大量废物，这些废物在处理的区域会导致环境问题。这些废物的增值策略之一是利用产酸发酵来生产挥发性脂肪酸。在这项研究中，选择了在西班牙不同工业中产生的四种农业产业废物，以评估它们在分批测定中的产酸潜力。所选废物为土豆固体废料、葡萄渣蒸馏物、葡萄渣和啤酒糟。土豆固体废料和葡萄渣的酸化程度最高（分别为 69%和 54%），其 VFA 谱中主要含有乙酸、丁酸和丙酸。在土豆固体废料中，评估了两个参数（底物/接种物比和初始添加的碱度）对酸化程度和 VFA 谱的影响。在底物/接种物比为 1.5 和 2.8 g VS 底物 g VS 接种物和初始碱度最高浓度（3 g L 作为 CaCO）时，可获得最高的 VFA 产量（高于添加的总 COD 的 70%）。此外，还证明了初始碱度的增加可以改变在所有 S/I 比下获得的 VFA 谱，减少丁酸和丙酸的相对量，增加乙酸的量。
