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Evaluating the effect of enzymatic pretreatment on the anaerobic digestibility of pulp and paper biosludge

Anaerobic digestion of biosludge has not yet been implemented in pulp mills due to low biogas yields. Enzymatic pretreatment of biosludge has shown improvements in biogas yields but results are varied. A key limitation of previous studies is that they fail to consider the COD contribution from the e...

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Autores principales: Bonilla, Sofia, Choolaei, Zahra, Meyer, Torsten, Edwards, Elizabeth A., Yakunin, Alexander F., Allen, D. Grant
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5767569/
https://www.ncbi.nlm.nih.gov/pubmed/29349044
http://dx.doi.org/10.1016/j.btre.2017.12.009
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author Bonilla, Sofia
Choolaei, Zahra
Meyer, Torsten
Edwards, Elizabeth A.
Yakunin, Alexander F.
Allen, D. Grant
author_facet Bonilla, Sofia
Choolaei, Zahra
Meyer, Torsten
Edwards, Elizabeth A.
Yakunin, Alexander F.
Allen, D. Grant
author_sort Bonilla, Sofia
collection PubMed
description Anaerobic digestion of biosludge has not yet been implemented in pulp mills due to low biogas yields. Enzymatic pretreatment of biosludge has shown improvements in biogas yields but results are varied. A key limitation of previous studies is that they fail to consider the COD contribution from the enzyme solutions. The aim of this study was to systematically investigate the potential for enzymatic pretreatment on the anaerobic digestibility of pulp mill biosludge. Out of the six enzymes tested, four enhanced the anaerobic digestibility of biosludge. At the end of the BMP, a maximum improvement of 26% in biogas yield was observed with protease from B. licheniformis. There was no correlation between enzymatic activities on standard substrates and/or on biosludge and the effect of enzymes on biogas yields. Enzymes have potential for improving biosludge anaerobic digestibility but more research on optimal conditions and potential synergies with other pretreatment is needed.
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spelling pubmed-57675692018-01-18 Evaluating the effect of enzymatic pretreatment on the anaerobic digestibility of pulp and paper biosludge Bonilla, Sofia Choolaei, Zahra Meyer, Torsten Edwards, Elizabeth A. Yakunin, Alexander F. Allen, D. Grant Biotechnol Rep (Amst) Article Anaerobic digestion of biosludge has not yet been implemented in pulp mills due to low biogas yields. Enzymatic pretreatment of biosludge has shown improvements in biogas yields but results are varied. A key limitation of previous studies is that they fail to consider the COD contribution from the enzyme solutions. The aim of this study was to systematically investigate the potential for enzymatic pretreatment on the anaerobic digestibility of pulp mill biosludge. Out of the six enzymes tested, four enhanced the anaerobic digestibility of biosludge. At the end of the BMP, a maximum improvement of 26% in biogas yield was observed with protease from B. licheniformis. There was no correlation between enzymatic activities on standard substrates and/or on biosludge and the effect of enzymes on biogas yields. Enzymes have potential for improving biosludge anaerobic digestibility but more research on optimal conditions and potential synergies with other pretreatment is needed. Elsevier 2018-01-05 /pmc/articles/PMC5767569/ /pubmed/29349044 http://dx.doi.org/10.1016/j.btre.2017.12.009 Text en © 2018 The Authors http://creativecommons.org/licenses/by/4.0/ This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Bonilla, Sofia
Choolaei, Zahra
Meyer, Torsten
Edwards, Elizabeth A.
Yakunin, Alexander F.
Allen, D. Grant
Evaluating the effect of enzymatic pretreatment on the anaerobic digestibility of pulp and paper biosludge
title Evaluating the effect of enzymatic pretreatment on the anaerobic digestibility of pulp and paper biosludge
title_full Evaluating the effect of enzymatic pretreatment on the anaerobic digestibility of pulp and paper biosludge
title_fullStr Evaluating the effect of enzymatic pretreatment on the anaerobic digestibility of pulp and paper biosludge
title_full_unstemmed Evaluating the effect of enzymatic pretreatment on the anaerobic digestibility of pulp and paper biosludge
title_short Evaluating the effect of enzymatic pretreatment on the anaerobic digestibility of pulp and paper biosludge
title_sort evaluating the effect of enzymatic pretreatment on the anaerobic digestibility of pulp and paper biosludge
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5767569/
https://www.ncbi.nlm.nih.gov/pubmed/29349044
http://dx.doi.org/10.1016/j.btre.2017.12.009
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