A Comparative Study of Biogas Reactor Fluid Rheology—Implications for Mixing Profile and Power Demand

Processes

卷:7

Mohammad Safari¹  Hossein Nadali Najafabadi¹  Bo H. Svensson²  Luka Šafarič²  Sepehr Shakeri Yekta²  Annika Björn²  Jörgen Ejlertsson²  Anna Karlsson³  Francesco Ometto³ 

[1] Department of Management and Engineering, Linköping University, SE-581 83 Linköping, Sweden;

[2] Department of Thematic Studies—Environmental Change, Linköping University, SE-581 83 Linköping, Sweden;

[3] Scandinavian Biogas Fuels AB, SE-111 60 Stockholm, Sweden;

关键词: anaerobic digestion;    viscosity;    substrate;    computational fluid dynamics;    stirring;   

DOI  :  10.3390/pr7100700

来源: DOAJ

【 摘 要 】

Anaerobic digestion (AD) is an established process for integrating waste management with renewable energy and nutrient recovery. Much of the research in this field focuses on the utilisation of new substrates, yet their effects on operational aspects such as fluid behaviour and power requirement for mixing are commonly overlooked, despite their importance for process optimisation. This study analysed rheological characteristics of samples from 21 laboratory-scale continuous stirred-tank biogas reactors (CSTBRs) digesting a range of substrates, in order to evaluate substrate effect on mixing efficiency and power demand through computational fluid dynamics (CFD). The results show that substrate and process parameters, such as solids content and organic loading, all have a significant effect on CSTBR fluid rheology. The correlation levels between rheological and process parameters were different across substrates, while no specific fluid behaviour patterns could be associated with substrate choice. Substrate should thus be considered an equally important rheology effector as process parameters. Additional substrate-related parameters should be identified to explain the differences in correlations between rheological and process parameters across substrate groups. The CFD modelling revealed that the rheology differences among the AD processes have significant implications for mixing efficiency and power demand of the CSTBRs, highlighting the importance of considering the substrate-induced effects on CSTBR rheology before including a new substrate.

【 授权许可】

Unknown