Modeling thixotropic break-down behavior of dense anaerobically digested sludge

Abstract Mixing and homogenization in anaerobic digesters are affected by the flow curve of sludge. The aim this study is to mathematically express dense anaerobically digested sludge behaving as thixotropic pseudoplastic fluids. Time-dependent changes two parameters, i.e., consistency index ( µ p ) n ), shear modeled using a second-order kinetic equation with coefficient that includes power function strain rate. calculated results consistent experimental results. parameters yielded ultimate values after shearing were associated concentration, unlike other parameters.