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Volatile fatty acid production from mesophilic acidogenic fermentation of organic fraction of municipal solid waste and food waste under acidic and alkaline pH

This study is focused on the effects of pH on the production of volatile fatty acids (VFAs) and their distribution through the acidogenic fermentation of source-sorted organic fraction of municipal solid waste (OFMSW) from a mechanical-biological treatment (MBT) plant, and food waste (FW) from a uni...

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Autores principales: Cheah, Yen-Keong, Vidal-Antich, Carme, Dosta, Joan, Mata-Álvarez, Joan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6923264/
https://www.ncbi.nlm.nih.gov/pubmed/31111388
http://dx.doi.org/10.1007/s11356-019-05394-6
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author Cheah, Yen-Keong
Vidal-Antich, Carme
Dosta, Joan
Mata-Álvarez, Joan
author_facet Cheah, Yen-Keong
Vidal-Antich, Carme
Dosta, Joan
Mata-Álvarez, Joan
author_sort Cheah, Yen-Keong
collection PubMed
description This study is focused on the effects of pH on the production of volatile fatty acids (VFAs) and their distribution through the acidogenic fermentation of source-sorted organic fraction of municipal solid waste (OFMSW) from a mechanical-biological treatment (MBT) plant, and food waste (FW) from a university canteen. In semi-continuous lab-scale digesters using OFMSW at a hydraulic retention time (HRT) of 3.5 days under acidic conditions (pH 6.0), the VFA concentration in the effluent increased to 9.8–11.5 g L(−1) (VS content of the feedstock between 4.2 and 5.2% w/w), while its individual VFA profiling was similar to the influent which was already pre-fermented (namely, C(2) 35–41%, C(3) 18–22%, C(4) 17–21%, and C(5) 9–12%). When working with the same conditions but using FW as feedstock, an effluent with a VFA concentration up to 11.5 g VFA L(−1) (FW with a VS content of 5.5% w/w) and a stable distribution of C(2) and C(4) acids (up to 60.3% and 12.9%, respectively) but with very low quantities of C(3) and C(5) acids (lower than 1.8 and 2.7%, respectively) was obtained. Anaerobic batch tests using FW revealed that alkaline pH near 9 could lead to higher VFA production with high acetic acid content when compared to pH 6. In the semi-continuous fermenters working at alkaline conditions (pH 9.5–10) using OFMSW and FW, an enhanced solubilization of organic matter was registered with respect to the fermenters working under acidic conditions. This fact was not reflected in a higher VFA production when using OFMSW as feedstock, probably due to free ammonia inhibition, since OFMSW was mixed in the MBT plant with supernatant from anaerobic digestion of this biowaste. However, when using FW, alkaline conditions lead to an enhanced VFA production with respect to the reactor working under acidic conditions, being acetic acid the predominant product, which represented up to 91% of the VFA spectrum obtained. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s11356-019-05394-6) contains supplementary material, which is available to authorized users.
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spelling pubmed-69232642020-01-02 Volatile fatty acid production from mesophilic acidogenic fermentation of organic fraction of municipal solid waste and food waste under acidic and alkaline pH Cheah, Yen-Keong Vidal-Antich, Carme Dosta, Joan Mata-Álvarez, Joan Environ Sci Pollut Res Int Advances & Prospects in the field of Waste Management This study is focused on the effects of pH on the production of volatile fatty acids (VFAs) and their distribution through the acidogenic fermentation of source-sorted organic fraction of municipal solid waste (OFMSW) from a mechanical-biological treatment (MBT) plant, and food waste (FW) from a university canteen. In semi-continuous lab-scale digesters using OFMSW at a hydraulic retention time (HRT) of 3.5 days under acidic conditions (pH 6.0), the VFA concentration in the effluent increased to 9.8–11.5 g L(−1) (VS content of the feedstock between 4.2 and 5.2% w/w), while its individual VFA profiling was similar to the influent which was already pre-fermented (namely, C(2) 35–41%, C(3) 18–22%, C(4) 17–21%, and C(5) 9–12%). When working with the same conditions but using FW as feedstock, an effluent with a VFA concentration up to 11.5 g VFA L(−1) (FW with a VS content of 5.5% w/w) and a stable distribution of C(2) and C(4) acids (up to 60.3% and 12.9%, respectively) but with very low quantities of C(3) and C(5) acids (lower than 1.8 and 2.7%, respectively) was obtained. Anaerobic batch tests using FW revealed that alkaline pH near 9 could lead to higher VFA production with high acetic acid content when compared to pH 6. In the semi-continuous fermenters working at alkaline conditions (pH 9.5–10) using OFMSW and FW, an enhanced solubilization of organic matter was registered with respect to the fermenters working under acidic conditions. This fact was not reflected in a higher VFA production when using OFMSW as feedstock, probably due to free ammonia inhibition, since OFMSW was mixed in the MBT plant with supernatant from anaerobic digestion of this biowaste. However, when using FW, alkaline conditions lead to an enhanced VFA production with respect to the reactor working under acidic conditions, being acetic acid the predominant product, which represented up to 91% of the VFA spectrum obtained. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s11356-019-05394-6) contains supplementary material, which is available to authorized users. Springer Berlin Heidelberg 2019-05-20 2019 /pmc/articles/PMC6923264/ /pubmed/31111388 http://dx.doi.org/10.1007/s11356-019-05394-6 Text en © The Author(s) 2019 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Advances & Prospects in the field of Waste Management
Cheah, Yen-Keong
Vidal-Antich, Carme
Dosta, Joan
Mata-Álvarez, Joan
Volatile fatty acid production from mesophilic acidogenic fermentation of organic fraction of municipal solid waste and food waste under acidic and alkaline pH
title Volatile fatty acid production from mesophilic acidogenic fermentation of organic fraction of municipal solid waste and food waste under acidic and alkaline pH
title_full Volatile fatty acid production from mesophilic acidogenic fermentation of organic fraction of municipal solid waste and food waste under acidic and alkaline pH
title_fullStr Volatile fatty acid production from mesophilic acidogenic fermentation of organic fraction of municipal solid waste and food waste under acidic and alkaline pH
title_full_unstemmed Volatile fatty acid production from mesophilic acidogenic fermentation of organic fraction of municipal solid waste and food waste under acidic and alkaline pH
title_short Volatile fatty acid production from mesophilic acidogenic fermentation of organic fraction of municipal solid waste and food waste under acidic and alkaline pH
title_sort volatile fatty acid production from mesophilic acidogenic fermentation of organic fraction of municipal solid waste and food waste under acidic and alkaline ph
topic Advances & Prospects in the field of Waste Management
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6923264/
https://www.ncbi.nlm.nih.gov/pubmed/31111388
http://dx.doi.org/10.1007/s11356-019-05394-6
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