Evaluation of hydraulic mixing performance in a full-scale anaerobic digester with an external liquid recirculation system using CFD and experimental validation
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INVESTIGACIONMetadata
Title
Evaluation of hydraulic mixing performance in a full-scale anaerobic digester with an external liquid recirculation system using CFD and experimental validationAuthor (s)
Date
2021-12-26Publisher
Elsevier Ltd.ISSN
0009-2509Bibliographic citation
Arnau, R., Climent, J., Martínez-Cuenca, R., Rodríguez, J., & Chiva, S. (2022). Evaluation of hydraulic mixing performance in a full-scale anaerobic digester with an external liquid recirculation system using CFD and experimental validation. Chemical Engineering Science, 251, 117392.Type
info:eu-repo/semantics/articleVersion
info:eu-repo/semantics/publishedVersionSubject
Abstract
Anaerobic digestion (AD) has become an essential process for sludge treatment and its optimum performance is related to its mixing degree. In this study, a full-scale Anaerobic Digester (ADer) with an external recir ... [+]
Anaerobic digestion (AD) has become an essential process for sludge treatment and its optimum performance is related to its mixing degree. In this study, a full-scale Anaerobic Digester (ADer) with an external recirculation mixing system was studied via single-phase 3D-CFD simulations to assess the influence
of recirculation flow and a 3-blade propeller. The model was validated with inert tracer tests. The design
and mixing parameters were studied to characterise the mixing efficiency in different scenarios. The
design parameters were assessed first, but wide deviations from the recommended values were found.
Local mixing parameters were found to be useful for defining the degree and type of mixing, and are
highly recommended in the CFD studies of ADers. A second-order statistical moment was proposed as
a global mixing parameter to describe geometrical and local mixing, and to state a reliable homogenisation time. [-]
Is part of
Chemical Engineering Science, Vol. 251 (6 April 2022)Funder Name
Conselleria de Educació, Investigació, Cultura i Esport (Generalitat Valenciana) | Sustainable Bioenergy Research Consortium (SBRC)
Project code
ACIF/2016/255 | EX2019-003
Rights
info:eu-repo/semantics/openAccess
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