Enhancing biomass hydrolysis for biofuel production through hydrodynamic modeling and reactor design
Abstract A computational fluid dynamics model was developed to represent high‐solids enzymatic hydrolysis. This model accounted for the transient and multiphase (solids‐slurry) nature of the high‐solids enzymatic hydrolysis process. The model investigated the effect of slurry viscosity, rotational s...
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| Format: | Article |
| Language: | English |
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Wiley
2019-10-01
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| Series: | Energy Science & Engineering |
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| Online Access: | https://doi.org/10.1002/ese3.394 |
| _version_ | 1818509085051453440 |
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| author | Adriana Gaona Yuri Lawryshyn Bradley Saville |
| author_facet | Adriana Gaona Yuri Lawryshyn Bradley Saville |
| author_sort | Adriana Gaona |
| collection | DOAJ |
| description | Abstract A computational fluid dynamics model was developed to represent high‐solids enzymatic hydrolysis. This model accounted for the transient and multiphase (solids‐slurry) nature of the high‐solids enzymatic hydrolysis process. The model investigated the effect of slurry viscosity, rotational speed, and two impeller configurations on the distribution of insoluble solids. Initial CFD results identified segregation of the velocity contours for the non‐Newtonian slurry, which could potentially affect the reactor performance. The multiphase, transient CFD simulations showed that the first impeller configuration delayed the distribution of solids, and compartmentalized mixing in the reactor. The second impeller configuration, meanwhile, improved solids mixing and hydrolysis, while using lower rotational speeds (and thus, energy). The second impeller configuration also expanded the size of the pseudo‐cavern between impellers, which is critical for better dispersion of the solids. The CFD trends of the second impeller configuration were experimentally verified by conducting fed‐batch, high‐solids enzymatic hydrolysis trials with pretreated lignocellulose. The experimental results showed that the second impeller configuration provided better mixing of the non‐Newtonian slurry and enhanced solids‐enzyme interactions, leading to improved glucan‐to‐glucose conversion. This work illustrates that a transient multiphase CFD model can provide valuable insights into the design and optimization of high‐solids enzymatic hydrolysis reactors. The CFD model has identified pathways to improve the distribution of solids while reducing the energy needed for mixing. The CFD model can also guide experimental and design work to scale up these reactors from the laboratory to pilot and commercial scale. |
| first_indexed | 2024-12-10T22:40:40Z |
| format | Article |
| id | doaj.art-9c57342c984249ac8e4ee671243bbddd |
| institution | Directory Open Access Journal |
| issn | 2050-0505 |
| language | English |
| last_indexed | 2024-12-10T22:40:40Z |
| publishDate | 2019-10-01 |
| publisher | Wiley |
| record_format | Article |
| series | Energy Science & Engineering |
| spelling | doaj.art-9c57342c984249ac8e4ee671243bbddd2022-12-22T01:30:43ZengWileyEnergy Science & Engineering2050-05052019-10-01751823183710.1002/ese3.394Enhancing biomass hydrolysis for biofuel production through hydrodynamic modeling and reactor designAdriana Gaona0Yuri Lawryshyn1Bradley Saville2Laboratory of Bioprocess and Enzyme Technology Department of Chemical Engineering and Applied Chemistry University of Toronto Toronto Ontario CanadaLaboratory of Bioprocess and Enzyme Technology Department of Chemical Engineering and Applied Chemistry University of Toronto Toronto Ontario CanadaLaboratory of Bioprocess and Enzyme Technology Department of Chemical Engineering and Applied Chemistry University of Toronto Toronto Ontario CanadaAbstract A computational fluid dynamics model was developed to represent high‐solids enzymatic hydrolysis. This model accounted for the transient and multiphase (solids‐slurry) nature of the high‐solids enzymatic hydrolysis process. The model investigated the effect of slurry viscosity, rotational speed, and two impeller configurations on the distribution of insoluble solids. Initial CFD results identified segregation of the velocity contours for the non‐Newtonian slurry, which could potentially affect the reactor performance. The multiphase, transient CFD simulations showed that the first impeller configuration delayed the distribution of solids, and compartmentalized mixing in the reactor. The second impeller configuration, meanwhile, improved solids mixing and hydrolysis, while using lower rotational speeds (and thus, energy). The second impeller configuration also expanded the size of the pseudo‐cavern between impellers, which is critical for better dispersion of the solids. The CFD trends of the second impeller configuration were experimentally verified by conducting fed‐batch, high‐solids enzymatic hydrolysis trials with pretreated lignocellulose. The experimental results showed that the second impeller configuration provided better mixing of the non‐Newtonian slurry and enhanced solids‐enzyme interactions, leading to improved glucan‐to‐glucose conversion. This work illustrates that a transient multiphase CFD model can provide valuable insights into the design and optimization of high‐solids enzymatic hydrolysis reactors. The CFD model has identified pathways to improve the distribution of solids while reducing the energy needed for mixing. The CFD model can also guide experimental and design work to scale up these reactors from the laboratory to pilot and commercial scale.https://doi.org/10.1002/ese3.394biofuelsfed‐batch high‐solids enzymatic hydrolysislignocellulose biomasstransient, multiphase CFD modeling |
| spellingShingle | Adriana Gaona Yuri Lawryshyn Bradley Saville Enhancing biomass hydrolysis for biofuel production through hydrodynamic modeling and reactor design Energy Science & Engineering biofuels fed‐batch high‐solids enzymatic hydrolysis lignocellulose biomass transient, multiphase CFD modeling |
| title | Enhancing biomass hydrolysis for biofuel production through hydrodynamic modeling and reactor design |
| title_full | Enhancing biomass hydrolysis for biofuel production through hydrodynamic modeling and reactor design |
| title_fullStr | Enhancing biomass hydrolysis for biofuel production through hydrodynamic modeling and reactor design |
| title_full_unstemmed | Enhancing biomass hydrolysis for biofuel production through hydrodynamic modeling and reactor design |
| title_short | Enhancing biomass hydrolysis for biofuel production through hydrodynamic modeling and reactor design |
| title_sort | enhancing biomass hydrolysis for biofuel production through hydrodynamic modeling and reactor design |
| topic | biofuels fed‐batch high‐solids enzymatic hydrolysis lignocellulose biomass transient, multiphase CFD modeling |
| url | https://doi.org/10.1002/ese3.394 |
| work_keys_str_mv | AT adrianagaona enhancingbiomasshydrolysisforbiofuelproductionthroughhydrodynamicmodelingandreactordesign AT yurilawryshyn enhancingbiomasshydrolysisforbiofuelproductionthroughhydrodynamicmodelingandreactordesign AT bradleysaville enhancingbiomasshydrolysisforbiofuelproductionthroughhydrodynamicmodelingandreactordesign |