Exploring the impact of bulk and substrate physics on hydrolysis rates and biogas yields of anaerobic digesters pretreated with thermal hydrolysis.
collision efficiency
gelation
hydrolysis
kinetics
mesophilic digestion
thermal pretreatment
Journal
Water environment research : a research publication of the Water Environment Federation
ISSN: 1554-7531
Titre abrégé: Water Environ Res
Pays: United States
ID NLM: 9886167
Informations de publication
Date de publication:
Mar 2020
Mar 2020
Historique:
received:
30
03
2019
revised:
19
06
2019
accepted:
11
07
2019
pubmed:
25
7
2019
medline:
7
3
2020
entrez:
24
7
2019
Statut:
ppublish
Résumé
This study evaluated the role of bulk and substrate physics on hydrolysis rates and biogas yields in anaerobic digestion (AD) pretreated by thermal hydrolysis (THP). Although THP decreases sludge viscosity, no evidence was found that bulk viscosity impacted the biogas yield or hydrolysis kinetics. In addition, no significant difference between the biogas yields for different total solids concentrations nor floc sizes was detected. However, increased mixing speeds did increase biogas yields. As a result of thermal treatment, the model protein, bovine serum albumin, was harder to degrade in terms of both overall biodegradability and hydrolysis rates when their macrostructures were changed from liquid to gel and to solid structures; the opposite was true for the model polysaccharide, amylopectin. These results demonstrated that hydrolysis in THP-AD systems was impacted mostly by the physical properties of the substrate (gelation) rather than the bulk physical properties within the digester. PRACTITIONER POINTS: Bulk viscosity does not significantly impact hydrolysis efficiency (biogas yield). However, mixing speed impacts hydrolysis beyond biogas holdup effect. Increasing the amount of substrate-microbe collisions through increasing biomass concentration does not have an impact on hydrolysis efficiency or biogas yield. Proteins are harder to degrade when macrostructure changes from liquid to gel/solid as a result of heat treatment. Polysaccharides are easier to degrade when macrostructure changes from liquid to gel/solid as a result of heat treatment. The time required for digesters to reach peak biogas production rates increased with decreasing specific surface available on gel and solid structures.
Substances chimiques
Biofuels
0
Sewage
0
Methane
OP0UW79H66
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
378-388Subventions
Organisme : Water Research Foundation
ID : U4R15
Informations de copyright
© 2019 Water Environment Federation.
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