Journal article
Multiphase modeling of settling and suspension in anaerobic digester
Applied energy, Vol.111, pp.28-39
11/2013
Handle:
https://hdl.handle.net/2376/117108
Abstract
•Develop biowaste fluid dynamics for collision, aggregation and breakup of clusters.•Explore the mechanisms of settling and suspension in anaerobic digester.•Biowaste particles tended to have fluid properties.•Aided with CFD simulation, the scale-up effect was reduced.
Effective suspension and settling are critical for controlling biomass retention in a bioreactor. In this paper, a multi-fluid model with kinetic theory of granular flow (KTGF) was established to describe these phenomena in the biowaste particles flow in anaerobic digesters. Solid retention time (SRT) was added as a parameter into anaerobic digestion No.1 (ADM1) model to evaluate its effect on the biogas productivity. The model was experimentally validated in a liquid–gas–solid column reactor with gas and solid volume fraction and granular temperature as the major variables. The wastewater residence time distribution was also determined through modeling and measurement to evaluate the mixing pattern in the pilot column reactor. The effect of restitution coefficient on flow behavior of biowaste particles, particles settling and suspension were predicted. Settling and suspension processes of anaerobic digesters were simulated for lab and pilot-scale reactors with comparisons made for reactor configuration and geometry model, respectively. This study demonstrated that the multi-fluid model with KTGF could provide better understanding of impact of suspension and settling upon retaining biomass particles in the anaerobic digesters.
Metrics
9 Record Views
Details
- Title
- Multiphase modeling of settling and suspension in anaerobic digester
- Creators
- Liang Yu - Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164, USAJingwei Ma - Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164, USACraig Frear - Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164, USAQuanbao Zhao - Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164, USARobert Dillon - Department of Mathematics, Washington State University, Pullman, WA 99164, USAXiujin Li - Department of Environmental Science and Engineering, Center for Resources and Environmental Research, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of ChinaShulin Chen - Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164, USA
- Publication Details
- Applied energy, Vol.111, pp.28-39
- Publisher
- Elsevier Ltd
- Identifiers
- 99900583055301842
- Language
- English
- Resource Type
- Journal article