Cargando…

Influence of Enzyme Additives on the Rheological Properties of Digester Slurry and on Biomethane Yield

The use of enzyme additives in anaerobic digestion facilities has increased in recent years. According to the manufacturers, these additives should increase or accelerate the biogas yield and reduce the viscosity of the digester slurry. Such effects were confirmed under laboratory conditions. Howeve...

Descripción completa

Detalles Bibliográficos
Autores principales: Müller, Liane, Engler, Nils, Rostalsky, Kay, Müller, Ulf, Krebs, Christian, Hinz, Sandra
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7356200/
https://www.ncbi.nlm.nih.gov/pubmed/32512722
http://dx.doi.org/10.3390/bioengineering7020051
_version_ 1783558445468745728
author Müller, Liane
Engler, Nils
Rostalsky, Kay
Müller, Ulf
Krebs, Christian
Hinz, Sandra
author_facet Müller, Liane
Engler, Nils
Rostalsky, Kay
Müller, Ulf
Krebs, Christian
Hinz, Sandra
author_sort Müller, Liane
collection PubMed
description The use of enzyme additives in anaerobic digestion facilities has increased in recent years. According to the manufacturers, these additives should increase or accelerate the biogas yield and reduce the viscosity of the digester slurry. Such effects were confirmed under laboratory conditions. However, it has not yet been possible to quantify these effects in practice, partly because valid measurements on large-scale plants are expensive and challenging. In this research, a new enzyme product was tested under full-scale conditions. Two digesters were operated at identic process parameters—one digester was treated with an enzyme additive and a second digester was used as reference. A pipe viscometer was designed, constructed and calibrated and the rheological properties of the digester slurry were measured. Non-Newtonian flow behavior was modelled by using the Ostwald–de Baer law. Additionally, the specific biomethane yield of the feedstock was monitored to assess the influence of the enzyme additive on the substrate degradation efficiency. The viscosity measurements revealed a clear effect of the added enzyme product. The consistency factor K was significantly reduced after the enzyme application. There was no observable effect of enzyme application on the substrate degradation efficiency or specific biomethane yield.
format Online
Article
Text
id pubmed-7356200
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-73562002020-07-31 Influence of Enzyme Additives on the Rheological Properties of Digester Slurry and on Biomethane Yield Müller, Liane Engler, Nils Rostalsky, Kay Müller, Ulf Krebs, Christian Hinz, Sandra Bioengineering (Basel) Article The use of enzyme additives in anaerobic digestion facilities has increased in recent years. According to the manufacturers, these additives should increase or accelerate the biogas yield and reduce the viscosity of the digester slurry. Such effects were confirmed under laboratory conditions. However, it has not yet been possible to quantify these effects in practice, partly because valid measurements on large-scale plants are expensive and challenging. In this research, a new enzyme product was tested under full-scale conditions. Two digesters were operated at identic process parameters—one digester was treated with an enzyme additive and a second digester was used as reference. A pipe viscometer was designed, constructed and calibrated and the rheological properties of the digester slurry were measured. Non-Newtonian flow behavior was modelled by using the Ostwald–de Baer law. Additionally, the specific biomethane yield of the feedstock was monitored to assess the influence of the enzyme additive on the substrate degradation efficiency. The viscosity measurements revealed a clear effect of the added enzyme product. The consistency factor K was significantly reduced after the enzyme application. There was no observable effect of enzyme application on the substrate degradation efficiency or specific biomethane yield. MDPI 2020-06-04 /pmc/articles/PMC7356200/ /pubmed/32512722 http://dx.doi.org/10.3390/bioengineering7020051 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Müller, Liane
Engler, Nils
Rostalsky, Kay
Müller, Ulf
Krebs, Christian
Hinz, Sandra
Influence of Enzyme Additives on the Rheological Properties of Digester Slurry and on Biomethane Yield
title Influence of Enzyme Additives on the Rheological Properties of Digester Slurry and on Biomethane Yield
title_full Influence of Enzyme Additives on the Rheological Properties of Digester Slurry and on Biomethane Yield
title_fullStr Influence of Enzyme Additives on the Rheological Properties of Digester Slurry and on Biomethane Yield
title_full_unstemmed Influence of Enzyme Additives on the Rheological Properties of Digester Slurry and on Biomethane Yield
title_short Influence of Enzyme Additives on the Rheological Properties of Digester Slurry and on Biomethane Yield
title_sort influence of enzyme additives on the rheological properties of digester slurry and on biomethane yield
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7356200/
https://www.ncbi.nlm.nih.gov/pubmed/32512722
http://dx.doi.org/10.3390/bioengineering7020051
work_keys_str_mv AT mullerliane influenceofenzymeadditivesontherheologicalpropertiesofdigesterslurryandonbiomethaneyield
AT englernils influenceofenzymeadditivesontherheologicalpropertiesofdigesterslurryandonbiomethaneyield
AT rostalskykay influenceofenzymeadditivesontherheologicalpropertiesofdigesterslurryandonbiomethaneyield
AT mullerulf influenceofenzymeadditivesontherheologicalpropertiesofdigesterslurryandonbiomethaneyield
AT krebschristian influenceofenzymeadditivesontherheologicalpropertiesofdigesterslurryandonbiomethaneyield
AT hinzsandra influenceofenzymeadditivesontherheologicalpropertiesofdigesterslurryandonbiomethaneyield