How to avoid evaporation during rheological measurements of dewatered pasty sludge at high temperature

Mohamed Mouzaoui 1 J. Baudez Martial Sauceau 2 Patricia Arlabosse 2
1 UR TSCF - Technologies et systèmes d'information pour les agrosystèmes
2 RAPSODEE - Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement
Abstract : Controlling the residence time in paddle dryers and the drying efficiency imply the knowledge of rheological behaviour of highly concentrated and pasty sludge and its temperature dependency. However, because of perturbing effects such as evaporation, measurements are not fully representative of intrinsic sludge properties. Classical techniques usually considered in the literature for evaporation control are not efficient at high temperatures. This work gives a method to control the evaporation at high temperature that can be used with any commercial rheometer. The configuration concept is to prevent water loss by limiting the contact between the sheared sludge and the environment. This configuration allows preventing evaporation up to 80 °C at least during 2 hours. Its efficiency is confirmed at different total solid (TS) contents ranging from 20 to 47 wt.%.
Keywords : | bad data evaporation bad data pasty sludge high temperature rheology
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Mohamed Mouzaoui, J. Baudez, Martial Sauceau, Patricia Arlabosse. How to avoid evaporation during rheological measurements of dewatered pasty sludge at high temperature. Water Science and Technology, IWA Publishing, 2019, 79 (8), pp.1503-1510. ⟨10.2166/wst.2019.150⟩. ⟨hal-02120362⟩

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