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Pourquoi les boues ne tiennent pas en tas

Abstract : Sewage sludge is the residue of wastewater treatment, which must be stored before reused in agricultural or incineration. But storage areas appear often under-dimensioned due to creep flow of sludge. In this paper, we intend to demonstrate that a sludge can't be stored in heap because its flowing structure. Using rheometric experiments with pasty sludge and the pressure filtration with non-limed solid sludge, we demonstrate that a sludge is deformed as long as an external stress is applied, whichever its structure. Moreover, we show that fermentation affects the heap behavior : the sludge is more fluid during aging, but paradoxically, solid-liquid interactions are stronger. Finally, we highlight that leaching is a consequence of the creep flow of sludge in storage areas.
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Submitted on : Wednesday, April 28, 2021 - 7:02:23 AM
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J.C. Baudez. Pourquoi les boues ne tiennent pas en tas. Déchets Sciences et Techniques, INSA de Lyon 2003, 32, pp.3-7. ⟨10.4267/dechets-sciences-techniques.2474⟩. ⟨hal-02582939⟩



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