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Rheological Characterization of Anaerobic Sludge from Agricultural and Bio‐Waste Biogas Plants
Author(s) -
Gienau Tobias,
Kraume Matthias,
Rosenberger Sandra
Publication year - 2018
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.201700102
Subject(s) - shear thinning , rheology , biogas , arrhenius equation , viscosity , materials science , sewage sludge , anaerobic exercise , chemistry , pulp and paper industry , chemical engineering , waste management , sewage treatment , environmental science , environmental engineering , composite material , organic chemistry , activation energy , engineering , physiology , biology
Abstract Anaerobic sludges taken from 16 different biogas plants were analyzed with respect to their rheological characteristics. All sludges showed temperature‐dependent shear‐thinning behavior with viscosities from 900 – 6000 mPa s at 20 °C. Nevertheless, the liquid fraction of the anaerobic sludges also revealed temperature‐dependent, shear‐thinning behavior with viscosities well above water viscosity (2 – 40 mPa s at 20 °C). The rheological behavior of the liquid phase could be linked to organic fractions, i.e., proteins and polysaccharides. Shear‐thinning and temperature‐dependent behavior was modeled by the power‐law equation and the Arrhenius law, respectively.