Anaerobic digestion of wheat grass under mesophilic and thermophilic conditions and different inoculum sources

Igor M. O. Silva, Davide Dionisi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Anaerobic digestion of lignocellulosic biomass can be used to produce in one single step different products with applications as fuels or as bulk chemicals such as methane, ethanol and other particular volatile fatty acids: acetic, propionic and butyric acids. This study aims to investigate the anaerobic digestion of
lignocellulosic biomass (wheatgrass) in batch condition under mesophilic (40°C) and thermophilic (50°C) conditions, two inoculum concentrations and different microbial sources: anaerobic digester sludge and soil. Vials of wheatgrass powder (20 g/l) were inoculated and maintained under anaerobic condition in a water bath shaker with temperature control. The results showed that both inocula were able to hydrolyse lignocellulose biomass without physicochemical pre-treatment, but higher VSS and TC removals were achieved when anaerobic sludge inoculum was used. Acetic acid was the main product for the different batch conditions and corresponded to around 60% of the CODproducts. Butyric acid, propionic acid and ethanol were identified in lower concentration. The maximum volatile suspended solids (VSS) and total carbohydrates (TC) removal
were (44 ± 5) % and (50 ± 11) % respectively. The maximum yield of products in the liquid phase was 37% in COD basis.
Original languageEnglish
Pages (from-to)19-24
Number of pages6
JournalChemical Engineering Transactions
Volume50
DOIs
Publication statusPublished - Jun 2016

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Anaerobic digestion
Propionic acid
Biomass
Butyric acid
Carbohydrates
Acetic acid
Acetic Acid
Ethanol
Volatile fatty acids
Butyric Acid
Volatile Fatty Acids
Methane
Propionates
Temperature control
Powders
Soils
Water
Liquids

Cite this

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title = "Anaerobic digestion of wheat grass under mesophilic and thermophilic conditions and different inoculum sources",
abstract = "Anaerobic digestion of lignocellulosic biomass can be used to produce in one single step different products with applications as fuels or as bulk chemicals such as methane, ethanol and other particular volatile fatty acids: acetic, propionic and butyric acids. This study aims to investigate the anaerobic digestion oflignocellulosic biomass (wheatgrass) in batch condition under mesophilic (40°C) and thermophilic (50°C) conditions, two inoculum concentrations and different microbial sources: anaerobic digester sludge and soil. Vials of wheatgrass powder (20 g/l) were inoculated and maintained under anaerobic condition in a water bath shaker with temperature control. The results showed that both inocula were able to hydrolyse lignocellulose biomass without physicochemical pre-treatment, but higher VSS and TC removals were achieved when anaerobic sludge inoculum was used. Acetic acid was the main product for the different batch conditions and corresponded to around 60{\%} of the CODproducts. Butyric acid, propionic acid and ethanol were identified in lower concentration. The maximum volatile suspended solids (VSS) and total carbohydrates (TC) removalwere (44 ± 5) {\%} and (50 ± 11) {\%} respectively. The maximum yield of products in the liquid phase was 37{\%} in COD basis.",
author = "Silva, {Igor M. O.} and Davide Dionisi",
note = "The authors wish to acknowledge CAPES (Coordination for the Improvement of Higher Education Personnel) for the financial support and Mrs Elizabeth Hendrie and Ms Gabriela Paupitz for the technical collaboration. ISBN 978-88-95608-41-9",
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doi = "10.3303/CET1650004",
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AU - Dionisi, Davide

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N2 - Anaerobic digestion of lignocellulosic biomass can be used to produce in one single step different products with applications as fuels or as bulk chemicals such as methane, ethanol and other particular volatile fatty acids: acetic, propionic and butyric acids. This study aims to investigate the anaerobic digestion oflignocellulosic biomass (wheatgrass) in batch condition under mesophilic (40°C) and thermophilic (50°C) conditions, two inoculum concentrations and different microbial sources: anaerobic digester sludge and soil. Vials of wheatgrass powder (20 g/l) were inoculated and maintained under anaerobic condition in a water bath shaker with temperature control. The results showed that both inocula were able to hydrolyse lignocellulose biomass without physicochemical pre-treatment, but higher VSS and TC removals were achieved when anaerobic sludge inoculum was used. Acetic acid was the main product for the different batch conditions and corresponded to around 60% of the CODproducts. Butyric acid, propionic acid and ethanol were identified in lower concentration. The maximum volatile suspended solids (VSS) and total carbohydrates (TC) removalwere (44 ± 5) % and (50 ± 11) % respectively. The maximum yield of products in the liquid phase was 37% in COD basis.

AB - Anaerobic digestion of lignocellulosic biomass can be used to produce in one single step different products with applications as fuels or as bulk chemicals such as methane, ethanol and other particular volatile fatty acids: acetic, propionic and butyric acids. This study aims to investigate the anaerobic digestion oflignocellulosic biomass (wheatgrass) in batch condition under mesophilic (40°C) and thermophilic (50°C) conditions, two inoculum concentrations and different microbial sources: anaerobic digester sludge and soil. Vials of wheatgrass powder (20 g/l) were inoculated and maintained under anaerobic condition in a water bath shaker with temperature control. The results showed that both inocula were able to hydrolyse lignocellulose biomass without physicochemical pre-treatment, but higher VSS and TC removals were achieved when anaerobic sludge inoculum was used. Acetic acid was the main product for the different batch conditions and corresponded to around 60% of the CODproducts. Butyric acid, propionic acid and ethanol were identified in lower concentration. The maximum volatile suspended solids (VSS) and total carbohydrates (TC) removalwere (44 ± 5) % and (50 ± 11) % respectively. The maximum yield of products in the liquid phase was 37% in COD basis.

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