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Enhancing biogas plant production using pig manure and corn silage by adding wheat straw processed with liquid hot water and steam explosion

BACKGROUND: Pig manure utilization and valorization is an important topic with tightening regulations focused on ecological and safety issues. By itself pig manure is a poor substrate for biogas production because of its excessive nitrogen content relative to available organic carbon. Such substrate...

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Autores principales: Gaworski, Michał, Jabłoński, Sławomir, Pawlaczyk-Graja, Izabela, Ziewiecki, Rafał, Rutkowski, Piotr, Wieczyńska, Anna, Gancarz, Roman, Łukaszewicz, Marcin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5679381/
https://www.ncbi.nlm.nih.gov/pubmed/29151888
http://dx.doi.org/10.1186/s13068-017-0922-x
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author Gaworski, Michał
Jabłoński, Sławomir
Pawlaczyk-Graja, Izabela
Ziewiecki, Rafał
Rutkowski, Piotr
Wieczyńska, Anna
Gancarz, Roman
Łukaszewicz, Marcin
author_facet Gaworski, Michał
Jabłoński, Sławomir
Pawlaczyk-Graja, Izabela
Ziewiecki, Rafał
Rutkowski, Piotr
Wieczyńska, Anna
Gancarz, Roman
Łukaszewicz, Marcin
author_sort Gaworski, Michał
collection PubMed
description BACKGROUND: Pig manure utilization and valorization is an important topic with tightening regulations focused on ecological and safety issues. By itself pig manure is a poor substrate for biogas production because of its excessive nitrogen content relative to available organic carbon. Such substrate is alkaline, and methanogenesis can be suppressed, and so additional substrates with high organic carbon must be added. The most promising is straw, which is available from adjacent biogas plant cultures. However, the abundant lignocellulosic biomass of wheat straw undergoes slow decomposition, and only a fraction of the chemical energy can be converted into biogas; thus economical methods for pretreatment increasing bioavailability are sought. RESULTS: A method was investigated to increase the methane yield in a full-scale plant for co-fermenting pig manure with corn silage, which was the default substrate in the original source reactors. Increased lignocellulosic bioavailability of wheat straw was achieved by combining liquid hot water (LHW) and steam explosion (SE). According to FT-IR analysis, the treatment resulted in hemicellulose hydrolysis, partial cellulose depolymerization, and lignin bond destruction. Low-mass polysaccharides (0.6 × 10(3) g mol(−1)) had significantly higher concentration in the leachate of LHW-SE wheat straw than raw wheat straw. The methanogenic potential was evaluated using inoculum from two different biogas plants to study the influence of microorganism consortia. The yield was 24–34% higher after the pretreatment process. In a full-scale biogas plant, the optimal conditions were ~ 165 °C, ~ 2.33 MPa, and 10 min in LHW and ~ 65 °C and ~ 0.1 MPa for SE. The processes did not generate detectable inhibitors according to GC–MS analysis, such as furfural and 5-hydroxymethylfurfural. CONCLUSIONS: The LHW-SE combined pretreatment process increases the bioavailability of carbohydrates from wheat straw. The LHW-SE treated wheat straw gave similar biogas yields to corn silage, thus enables at least partial replacement of corn silage and is good for diversification of substrates. Surprisingly, microorganisms consortia from other biogas plant fed with other substrates may have higher efficiency in utilization of tested substrate. Thus, methanogenic consortia may be considered in the process of optimization at industrial scale. The efficiency was calculated, and the LHW-SE may be profitable at full industrial scale and further optimization is proposed.
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spelling pubmed-56793812017-11-17 Enhancing biogas plant production using pig manure and corn silage by adding wheat straw processed with liquid hot water and steam explosion Gaworski, Michał Jabłoński, Sławomir Pawlaczyk-Graja, Izabela Ziewiecki, Rafał Rutkowski, Piotr Wieczyńska, Anna Gancarz, Roman Łukaszewicz, Marcin Biotechnol Biofuels Research BACKGROUND: Pig manure utilization and valorization is an important topic with tightening regulations focused on ecological and safety issues. By itself pig manure is a poor substrate for biogas production because of its excessive nitrogen content relative to available organic carbon. Such substrate is alkaline, and methanogenesis can be suppressed, and so additional substrates with high organic carbon must be added. The most promising is straw, which is available from adjacent biogas plant cultures. However, the abundant lignocellulosic biomass of wheat straw undergoes slow decomposition, and only a fraction of the chemical energy can be converted into biogas; thus economical methods for pretreatment increasing bioavailability are sought. RESULTS: A method was investigated to increase the methane yield in a full-scale plant for co-fermenting pig manure with corn silage, which was the default substrate in the original source reactors. Increased lignocellulosic bioavailability of wheat straw was achieved by combining liquid hot water (LHW) and steam explosion (SE). According to FT-IR analysis, the treatment resulted in hemicellulose hydrolysis, partial cellulose depolymerization, and lignin bond destruction. Low-mass polysaccharides (0.6 × 10(3) g mol(−1)) had significantly higher concentration in the leachate of LHW-SE wheat straw than raw wheat straw. The methanogenic potential was evaluated using inoculum from two different biogas plants to study the influence of microorganism consortia. The yield was 24–34% higher after the pretreatment process. In a full-scale biogas plant, the optimal conditions were ~ 165 °C, ~ 2.33 MPa, and 10 min in LHW and ~ 65 °C and ~ 0.1 MPa for SE. The processes did not generate detectable inhibitors according to GC–MS analysis, such as furfural and 5-hydroxymethylfurfural. CONCLUSIONS: The LHW-SE combined pretreatment process increases the bioavailability of carbohydrates from wheat straw. The LHW-SE treated wheat straw gave similar biogas yields to corn silage, thus enables at least partial replacement of corn silage and is good for diversification of substrates. Surprisingly, microorganisms consortia from other biogas plant fed with other substrates may have higher efficiency in utilization of tested substrate. Thus, methanogenic consortia may be considered in the process of optimization at industrial scale. The efficiency was calculated, and the LHW-SE may be profitable at full industrial scale and further optimization is proposed. BioMed Central 2017-11-09 /pmc/articles/PMC5679381/ /pubmed/29151888 http://dx.doi.org/10.1186/s13068-017-0922-x Text en © The Author(s) 2017 Open AccessThis 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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
spellingShingle Research
Gaworski, Michał
Jabłoński, Sławomir
Pawlaczyk-Graja, Izabela
Ziewiecki, Rafał
Rutkowski, Piotr
Wieczyńska, Anna
Gancarz, Roman
Łukaszewicz, Marcin
Enhancing biogas plant production using pig manure and corn silage by adding wheat straw processed with liquid hot water and steam explosion
title Enhancing biogas plant production using pig manure and corn silage by adding wheat straw processed with liquid hot water and steam explosion
title_full Enhancing biogas plant production using pig manure and corn silage by adding wheat straw processed with liquid hot water and steam explosion
title_fullStr Enhancing biogas plant production using pig manure and corn silage by adding wheat straw processed with liquid hot water and steam explosion
title_full_unstemmed Enhancing biogas plant production using pig manure and corn silage by adding wheat straw processed with liquid hot water and steam explosion
title_short Enhancing biogas plant production using pig manure and corn silage by adding wheat straw processed with liquid hot water and steam explosion
title_sort enhancing biogas plant production using pig manure and corn silage by adding wheat straw processed with liquid hot water and steam explosion
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5679381/
https://www.ncbi.nlm.nih.gov/pubmed/29151888
http://dx.doi.org/10.1186/s13068-017-0922-x
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