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Kinetic investigations into the effect of inoculum to substrate ratio on batch anaerobic digestion of simulated food waste

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Kinetic investigations into the effect of inoculum to substrate ratio on batch anaerobic digestion of simulated food waste. / Gandhi, B.P.; Otite, S.V.; Fofie, E.A. et al.

In: Renewable Energy, Vol. 195, 31.08.2022, p. 311-321.

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Gandhi BP, Otite SV, Fofie EA, Lag-Brotons AJ, Ezemonye LI, Semple KT et al. Kinetic investigations into the effect of inoculum to substrate ratio on batch anaerobic digestion of simulated food waste. Renewable Energy. 2022 Aug 31;195:311-321. Epub 2022 Jun 17. doi: 10.1016/j.renene.2022.05.134

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Gandhi, B.P. ; Otite, S.V. ; Fofie, E.A. et al. / Kinetic investigations into the effect of inoculum to substrate ratio on batch anaerobic digestion of simulated food waste. In: Renewable Energy. 2022 ; Vol. 195. pp. 311-321.

Bibtex

@article{c76eca0904564aa1a04043813c1c8813,
title = "Kinetic investigations into the effect of inoculum to substrate ratio on batch anaerobic digestion of simulated food waste",
abstract = "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 CH 4/g VS added) and 1.00 (152 ± 12 ml CH 4/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. ",
keywords = "Batch anaerobic digestion, Inoculum to substrate ratio, Food waste, Macromolecules, Cellulose and lignin, Acidification",
author = "B.P. Gandhi and S.V. Otite and E.A. Fofie and A.J. Lag-Brotons and L.I. Ezemonye and K.T. Semple and A.D. Martin",
year = "2022",
month = aug,
day = "31",
doi = "10.1016/j.renene.2022.05.134",
language = "English",
volume = "195",
pages = "311--321",
journal = "Renewable Energy",
issn = "0960-1481",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - Kinetic investigations into the effect of inoculum to substrate ratio on batch anaerobic digestion of simulated food waste

AU - Gandhi, B.P.

AU - Otite, S.V.

AU - Fofie, E.A.

AU - Lag-Brotons, A.J.

AU - Ezemonye, L.I.

AU - Semple, K.T.

AU - Martin, A.D.

PY - 2022/8/31

Y1 - 2022/8/31

N2 - 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 CH 4/g VS added) and 1.00 (152 ± 12 ml CH 4/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.

AB - 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 CH 4/g VS added) and 1.00 (152 ± 12 ml CH 4/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.

KW - Batch anaerobic digestion

KW - Inoculum to substrate ratio

KW - Food waste

KW - Macromolecules

KW - Cellulose and lignin

KW - Acidification

U2 - 10.1016/j.renene.2022.05.134

DO - 10.1016/j.renene.2022.05.134

M3 - Journal article

VL - 195

SP - 311

EP - 321

JO - Renewable Energy

JF - Renewable Energy

SN - 0960-1481

ER -