Modelling the rheological properties of sludge during anaerobic digestion in a batch reactor by using electrical measurements

Electrical and rheological properties of sewage sludge – Impact of the solid content

“…Previous work has shown that the sludge electrical properties could be an indicator of sludge rheological properties (Dieud e-Fauvel et al, 2014). It was also shown that similar molecular phenomena should be involved in these both types of physical properties.…”

A comprehensive review on rheological studies of sludge from various sections of municipal wastewater treatment plants for enhancement of process performance

“…The rheology of Non-newtonian fluids like, polymers, detergents, pastes and wax, oil and biological materials like sludge is very complex and requires thorough investigation [1][2][3][4][5][6][7]. This particular research reviews the rheological flow behaviour been conducted in the area of sludge rheology [5][6][7][8][9][10][11][12][13][14].…”

Rheological behavior of the sludge in a long-running anaerobic digestor: Essential factors to optimize the operation

“…Due to its attractive merits in bio-gas recovery and degradation of high concentration biomass, it is still an attractive approach in the related environmental engineering field. For reducing the space requirement, an anaerobic digestor is generally operated at high concentration of biomass, which determines the contained fluid within the digestor being a non-Newtonian fluid and exhibiting very special characteristics, for instance, variable viscosity, thixotropy, and at the same time manifesting a pseudo plastic behavior when being exerted an external shear force [1,2]. As a non-Newtonian fluid, the shear stress is not linearly proportional to the shear rate.…”

“…Thus, a real-time approach on the basis of rheological behavior is of primary importance to achieve an online monitoring and controlling an anaerobic digestor, which is beneficial to the stable operation of an AD process. 9 To the best of our knowledge, most of the literatures about the anaerobic sludge rheology have only focused on measuring the basic properties of the fluid in a digestor, including the total suspended solids (TSS), the surface charge and ionic strength of a bulk solution [18], the extracellular polymeric substances (EPS) content [6], and evaluating their influences on the rheological behaviors from a short-term viewpoint [1,2,17]. However, from a practical viewpoint, only the data obtained from a long-running anaerobic digestor can provide a useful and reliable indication as the reference for the subsequent investigation [19].…”