Rheological Behavior and Characterization of Drinking Water Treatment Sludge from Morocco

Fantasse Azeddine (), Parra Angarita Sergio, Léonard Angélique, Lakhal El Khadir, Idlimam Ali and Bougayr El Houssayne
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Fantasse Azeddine: Chemical Engineering Research Unit, PEPs, University of Liège, 4000 Liège, Belgium
Parra Angarita Sergio: Chemical Engineering Research Unit, PEPs, University of Liège, 4000 Liège, Belgium
Léonard Angélique: Chemical Engineering Research Unit, PEPs, University of Liège, 4000 Liège, Belgium
Lakhal El Khadir: Laboratory of Fluid Mechanics and Energetics (LMFE), Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakesh 40000, Morocco
Idlimam Ali: Team of Solar Energy and Medicinal Plants EESPAM, Teacher’s Training College, Cadi Ayyad University, Marrakesh 40000, Morocco
Bougayr El Houssayne: Engineering & Applied Technologies Laboratory (LITA), Higher School of Technology—Beni Mellal, Sultan Moulay Slimane University, Beni-Mellal 23000, Morocco

Clean Technol., 2023, vol. 5, issue 1, 1-15

Abstract: Drinking water treatment generates a high amount of pasty by-product known as drinking water treatment sludge (DWTS). The chemical composition, microstructure and rheological behavior of DWTS are of utmost importance in the calculation, design, optimization, commissioning and control of its treatment processes. The purpose of this research was to characterize the DWTS from the drinking water treatment plant of Marrakech (Morocco), aiming to help future researchers and engineers in predicting its hydrodynamic behavior. The first part of this study was devoted to the physical structure and the chemical composition of sludge. The second part was oriented towards the study of the mechanical properties; a penetration test and a rotational rheology test were performed. For the first test, a force–length penetration diagram was plotted in order to calculate the hardness, the cohesiveness and the adhesiveness of DWTS. For the second test, the shear stress and the apparent viscosity were plotted and fitted to five rheological models, as function of the shear rate, aiming to describe the rheological behavior of samples. The obtained results reveal that the drinking water treatment sludge from Marrakech is a porous, amorphous and highly adhesive material, with a shear-thinning (pseudoplastic) rheological behavior that can be described according to the Herschel–Bulkley model (better in low-rate stresses, R² = 0.98) or the Windhad model (better in high shear rates, R² = 0.96) and is mainly composed of silica, aluminum and iron oxides.

Keywords: drinking water treatment sludge; rheology; texture; chemical characterization; waste management (search for similar items in EconPapers)
JEL-codes: Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:gam:jcltec:v:5:y:2023:i:1:p:15-273:d:1070823

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