Methane potential of fruit and vegetable waste: an evaluation of the semi-continuous anaerobic mono-digestion.

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Edwiges, Thiago
Frare, Laercio Mantovani
Lima Alino, Joao Henrique
Triolo, Jin Mi
Flotats, Xavier
Silva de Mendonca Costa, Monica Sarolli
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2020
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Abstract

The anaerobic digestion (AD) of a high diversity blend of fruit and vegetable waste (FVW) generated in tropical conditions as a single substrate was performed. A continuously stirred tank reactor (CSTR) operated in semi-continuous regime was used for AD. The reactor performance was monitored with gradually increasing organic loading rates (OLRs) from 0.5 up to 5.0 gVS L-1 d-1. The biochemical methane potential (BMP) of FVW determined by batch bottles was 360 LN CH4 kgVS-1, with a biodegradability of 79%. A stable pH with an adequate level of buffering capacity was observed during the entire experiment. Methane yield indicated the best performance at an OLR of 3.0 gVS L-1 d-1, with 285 LN CH4 kgVS-1 added, reaching 79% of BMP. At an OLR over 3.0 gVS L-1 d-1 accumulation of volatile fatty acids (VFA) was detected; in particular, propionic acid was monitored, and a decreased methane yield was detected. Biogas production rate was 1.55 LN L-1 d-1 and showed linear increase according to increases in the OLR.

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Environmental Technology

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41

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7

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This is an Author's Accepted Manuscript of an article published in Environmental Technology, Volume 41, Issue 7, Pages 921-930, 02 Sep 2018, copyright Taylor & Francis, available online at: https://doi.org/10.1080/09593330.2018.1515262

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Environmental sciences

Biological sciences

Engineering

BMP

Biogas

CSTR

biodegradability

organic loading rate

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Edwiges, T; Frare, LM; Alino, JHL; Triolo, JM; Flotats, X; Silva de Mendonça Costa, MS, Methane potential of fruit and vegetable waste: an evaluation of the semi-continuous anaerobic mono-digestion., Environmental Technology, 2018, 41 (7), pp. 921-930

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