Rheological properties of digestate from agricultural biogas plants: An overview of measurement techniques and influencing factors

Nico Schneider and Mandy Gerber

Renewable and Sustainable Energy Reviews, 2020, vol. 121, issue C

Abstract: The main objective of this work is a comparison of measurement techniques that have been modified allowing for rheological measurements of agricultural digestate without a required pretreatment. This includes detailed information on the theoretical physical background, experimental set-up and for mixing rheometers also the calibration procedures, namely the Metzner-Otto concept/Rieger-Novak method and the Couette analogy. Furthermore, the advantages and disadvantages of rotational rheometers, torsion viscometers, mixing rheometers, pipe viscometers and the so-called ball measuring system are stated. As a result, pipe viscometers are found to be applicable for field experiments, while mixing rheometers were found to be the most suitable choice for lab-scale experiments. Within this work, a recommendation for a possible configuration for a mixing rheometer is provided.

Keywords: Digestate; Biogas; Viscosity; Rheological properties; Anaerobic digestion; Rheometer; Viscometer (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (3)

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DOI: 10.1016/j.rser.2020.109709

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