Flow in a gas-lift digester with a central draft-tube was investigated using computational fluid dynamics (CFD) and different turbulence closure models. The k-ω Shear-Stress-Transport (SST), Renormalization-Group (RNG) k-∊, Linear Reynolds-Stress-Model (RSM) and Transition-SST models were tested for a gas-lift loop reactor under Newtonian flow conditions validated against published experimental work. The results identify that flow predictions within the reactor (where flow is transitional) are particularly sensitive to the turbulence model implemented; the Transition-SST model was found to be the most robust for capturing mixing behaviour and predicting separation reliably. Therefore, Transition-SST is recommended over k-∊ models for use in comparable mixing problems. A comparison of results obtained using multiphase Euler-Lagrange and singlephase approaches are presented. The results support the validity of the singlephase modelling assumptions in obtaining reliable predictions of the reactor flow. Solver independence of results was verified by comparing two independent finite-volume solvers (Fluent-13.0sp2 and OpenFOAM-2.0.1).
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.biortech.2013.03.162 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Recent advances in biological technologies for anoxic biogas desulfurization.
Chemosphere
April 2023
Department of Chemical Engineering and Food Technologies, Wine and Agrifood Research Institute (IVAGRO), Faculty of Sciences, University of Cadiz, 11510, Puerto Real, Cádiz, Spain.
Recovery of the energy contained in biogas will be essential in coming years to reduce greenhouse gas emissions and our current dependence on fossil fuels. The elimination of HS is a priority to avoid equipment corrosion, poisoning of catalytic systems and SO emissions in combustion engines. This review describes the advances made in this technology using fixed biomass bioreactors (FBB) and suspended growth bioreactors (SGB) since the first studies in this field in 2008.
View Article and Find Full Text PDFAnaerobic mono and co-digestion of organic fraction of municipal solid waste and landfill leachate at industrial scale: Impact of volatile organic loading rate on reaction kinetics, biogas yield and microbial diversity.
Sci Total Environ
December 2020
Bioengineering and Environmental Sciences (BEES) Group, DEEE, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad - 201002, India. Electronic address:
The present study was aimed to demonstrate a semi-commercial biomethanation plant based on anaerobic gas lift reactor (AGR) for the mono and co-digestion of organic fraction of municipal solid waste (OFMSW) and landfill leachate (LL) for 47 weeks. The reactors were commissioned at a volatile organic loading rate (VOLR) starting from 0.4 to 6.
View Article and Find Full Text PDFConversion of waste cooking oil into biogas: perspectives and limits.
Appl Microbiol Biotechnol
April 2020
Research Centre for Animal Production and Aquaculture, Consiglio per la ricerca in agricoltura e l'analisi dell'economia agraria (CREA), Via Beccastecca 345, 41018, San Cesario sul Panaro, MO, Italy.
Each year, large quantities of waste cooking oils are produced worldwide which are currently reused mainly for biodiesel production. Since lipids have a very high potential for biomethanation, the production of biogas is a possible alternative for the recycling of edible used oils. The digestion of fats is hindered mainly by their hydrophobicity, which implies a biphasic system with problems of floating and foaming of the oily materials, and by the accumulation of long-chain fatty acids, which are toxic to microbial consortia.
View Article and Find Full Text PDFRecovery of calcium phosphate granules from black water using a hybrid upflow anaerobic sludge bed and gas-lift reactor.
Environ Res
November 2019
Wetsus, European Centre of Excellence for Sustainable Water Technology, P.O: Box 1113, 8900CC, Leeuwarden, the Netherlands; Sub-department of Environmental Technology, Wageningen University, P.O. Box 17, 6700AA, Wageningen, the Netherlands. Electronic address:
Adding calcium during anaerobic digestion of vacuum collected black water (BW) in an up-flow anaerobic sludge bed (UASB) reactor increased the retention of total phosphorus (P) in the reactor from 51% to 87%. However, the insufficient mixing in the reactor caused cementation and relatively high content of organics in the recovered calcium phosphate (CaP) granules, limiting the P recovery. In this study, the UASB reactor was mixed with an internal gas-lift (UASB-GL) to prevent cementation and to enhance the P content in CaP granules.
View Article and Find Full Text PDFA novel anaerobic filter membrane bioreactor: prototype start-up and filtration assays.
Water Sci Technol
December 2018
Department of Biotechnology and Food Science, Chemical Engineering Division, University of Burgos, Plaza Misael Bañuelos, 09001 Burgos, Spain E-mail:
Anaerobic digestion allows efficient treatment of high loaded wastewater, and membrane technology allows obtaining high quality effluents with complete biomass retention. However, high biomass concentration interferes with membrane fouling. In the present work, a new bioreactor that integrates an attached biomass anaerobic culture on a fixed bed and a submerged membrane has been started up.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!