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Rheological characterization of sludge in divided granular-like and pasty states using a granular rheometer

Abstract : Structural changes during sludge treatments impact flowability and raise severe technical issues. In this study, the sludge consistency is analysed using the thread rolling test. Transition from pasty to granular-like material occurs at a total solid (TS) content of 43 wt%. A granular rheometer is used to characterize sludge's flowability over a wide range of TS content. The typical powder-like behaviour is recorded whatever the TS contents. All the shear stresses/consolidations curves exhibit a linear increase, highlighting the contribution of frictional interactions. Fitting the Mohr-Coulomb failure criterion to these curves emphasizes a substantial rise of frictional interactions from 43 wt%. Flow functions are determined from the Mohr's circle stress analysis. According to the classification of powder flowability, sludge behaviour is analogous to that of very cohesive powders for 25.5 < TS < 43 wt% while for lower and higher TS contents, the material behaves like cohesive powders.
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Submitted on : Wednesday, November 4, 2020 - 9:20:33 AM
Last modification on : Thursday, November 5, 2020 - 3:11:32 AM

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Mohamed Mouzaoui, Martial Sauceau, Laurent Devriendt, J.C. Baudez, Patricia Arlabosse. Rheological characterization of sludge in divided granular-like and pasty states using a granular rheometer. Powder Technology, Elsevier, 2021, 378, Part A, pp.521-527. ⟨10.1016/j.powtec.2020.09.070⟩. ⟨hal-02960216⟩

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