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• W3013318770 abstract "This paper is a critical evaluation of the effect of mixing on biogas production rates in an anaerobic digester. Mixing plays a prominent role in determining the efficiency of the anaerobic digestion process. This review analyzes the miscellaneous effects of mixing (on the microbial community, methane content and volatile fatty acids) at various mixing intensities and during different stages of the digestion process. Intermittent mixing (mixing at intervals) seems preferable in terms of the quality and quantity of biogas produced, and results in lower power consumption and maintenance costs associated with large-scale biogas production. Preferable mixing time (the length at intervals) and the intensity depends on the geometry of the digester and impeller.The conclusion is drawn that the study of the slurry rheology is very crucial in the designing of the mixing equipment, the shape and size of the digester, and the pipe transport system which can assist in minimizing the initial investment and operational costs. Accordingly, this paper focuses on the parameters which determine the potency of mixing, such as viscosity, total solid content and digester design. Empirical data demonstrated by various researchers regarding rheological characteristics is compared and reviewed. Consequently, close attention should be paid toward the optimization of mixing in terms of its speed, mixing time and impeller geometry, especially during different stages of the digestion process (hydrolysis, acidogenesis, acetogenesis and methanogenesis). Finally, readers will be guided to the extensive publications regarding optimization, directions of future research, and troubleshooting of the mixing operation in an anaerobic digester. This investigation will help to improve mixing efficiency with biogas plants.HighlightsEffect of shear rate on different stages of an anaerobic digestion process.Methane content varies with the variation in mixing speeds.Mixing effect is significant when the total solid content is higher.Intermittent mixing is favorable when compared to continuous mixing.The geometry of the digester and mixer is essential to evaluate digester mixing." @default.
• W3013318770 created "2020-04-03" @default.
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• W3013318770 date "2020-03-30" @default.
• W3013318770 modified "2023-10-18" @default.
• W3013318770 title "Impact of mixing intensity and duration on biogas production in an anaerobic digester: a review" @default.
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• W3013318770 doi "https://doi.org/10.1080/07388551.2020.1731413" @default.
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