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Experimental study of raw diary manure rheology subjected to anaerobic digester

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2018 ASABE Annual International Meeting  1800984.(doi:10.13031/aim.201800984)
Authors:   Niki Reza-zadeh, Dmitry Gradov, Xianpeng Sun, Binxin Wu
Keywords:   Non-Newtonian fluid, anaerobic digester, cattle manure digesting, Herschel-Bulkley fluid

Abstract. Wastewater management and recycling organic disposals attracted great interest from economical and sustainable viewpoints. Anaerobic digester (AD) includes a process of the waste materials conversion into clean and sustainable biogas that is enriched with methane. Mixing plays key role in bio-digestion and flud rheology affects mechanical mixing in AD. Regard to dramatic diversity of all previous studies published to date, due to various manure origin, it is necessary to investigate manure characteristics for each application individually. In present work, viscosity of a dairy farm manure, to be processed in pilot-scale bioreactor, is studied experimentally and imitated with Xanthan gum water solution sharing similar rheology of Herschel-Bulkley fluids. The rheological parameters of several water-based solutions of Xanthan gum with concentrations ranging 0.1%-1% as well as cattle manure of different total solid content up to 11.8% are measured experimentally and compared. The results show that Herschel-Bulkley model is capable to describe rheological behavior adequately in the solutions. Rheological characteristics of the solutions are presented.

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