Kinetic investigations into the effect of inoculum to substrate ratio on batch anaerobic digestion of simulated food waste
Kinetic investigations into the effect of inoculum to substrate ratio on batch anaerobic digestion of simulated food waste
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DOI：
10.1016/j.renene.2022.05.134
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发表时间：
2022-08-01
期刊：
影响因子：
8.7
通讯作者：
Martin, Alastair D.
中科院分区：
文献类型：
--
作者：
Gandhi, Bhushan P.;Otite, Saanu Victoria;Martin, Alastair D.
本厌氧消化（AD）研究的接种物与基质的比例（ISR 4.00至0.25）的甲烷生产的可行性的影响，使用模拟食物垃圾作为底物。鉴于AD过程的复杂性，本研究考虑了AD参数的相互依赖性及其对沼气生产的影响，随着消化的进行。最大甲烷产量在ISR 2.00（添加139 +/- 10 ml CH 4/g VS）和1.00（添加152 +/- 12 ml CH 4/g VS）之间;发现ISR进一步降低会导致系统酸化。在产酸条件下（ISR < 0.5），pH值和挥发性脂肪酸（VFA）分布被发现强烈依赖于ISR。与ISR 0.25相反，ISR 0.50显示反向β氧化，这导致在消化期间中链VFA浓度增加。发现系统在可逆酸化（ISR 1.00）下可存活的最大总VFA（TVFA）浓度为17.52 +/- 0.02 g/l，而ISR 0.50的最大TVFA产量为29.25 +/- 0.73 g/l。独特的是，这项研究还报告了高达55%的木质素厌氧降解酸化反应器中ISR 0.25，这是基于现有的文献，指向特定的细菌菌株的参与。(C)2022作者爱思唯尔有限公司出版
This anaerobic digestion (AD) study investigated the effect of inoculum to substrate ratio (ISR 4.00 to 0.25) on viability of methanogenesis using simulated food waste as substrate. Given the complexity of the AD process, this study considered the interdependency of AD parameters and their effect on biogas production, as the digestion progressed. Maximum methane production was between ISR 2.00 (139 +/- 10 ml CH4/g VS added) and 1.00 (152 +/- 12 ml CH4/g VS added); further decreases in ISR were found to result in system acidification. Under acidogenic conditions (ISR < 0.5) pH and the volatile fatty acid (VFA) profile were found to be strongly dependent on the ISR. In contrast to ISR 0.25, ISR 0.50 showed reverse beta oxidation, which resulted in increased concentrations of medium chain VFAs over the digestion period. Maximum total VFA (TVFA) concentrations that the system could survive with reversible acidification (ISR 1.00) was found to be 17.52 +/- 0.02 g/l, whereas the maximum TVFA production was found to be 29.25 +/- 0.73 g/l for ISR 0.50. Uniquely, this study also reports up to 55% anaerobic degradation of lignin in acidified reactors with ISR 0.25, which based on existing literature, points towards the involvement of specific bacterial strains. (C) 2022 The Authors. Published by Elsevier Ltd.