title: Relationship between electrical and rheological properties of sewage sludge - Impact of temperature.
abstract: Rheological properties are key criteria for sewage sludge management but are difficult to determine in situ. Because the literature often links rheological characteristics to surface charges of particles that interact, the underlying electrostatic interactions could be key characteristics explaining the rheological behavior of sludge. This paper analyzed the impact of temperature on both rheological and electrical properties. Both liquid and solid properties appear to be related to electrical impedance spectroscopy measurements because they obey the same relationships with the same activation energies. Infinite viscosity follows an Arrhenius law with temperature, whereas the storage modulus shows VTF (Vogel-Tamman-Fulcher) behavior. Sludge electrical behavior can be modeled by an equivalent 2-branch parallel circuit whose respective impedances follow Arrhenius and VTF relationships. More interestingly, resistors are proportional to (dissipative) viscous characteristics, whereas capacitances are proportional to the (storage) elastic modulus. These similarities and relationships underlie the same interactions that seem to be involved in both rheological and electrical properties. These interdependences are quite logical but open new insights into sludge characterization.
authors: Irstea, UR TSCF, Domaine des Palaquins, F-03150 Montoldre, France.
authors: C
authors: C
authors: Ségalen
authors: Irstea, UR TSCF, Domaine des Palaquins, F-03150 Montoldre, France. Electronic address: emilie.dieude-fauvel@irstea.fr.
authors: E
authors: E
authors: Dieudé-Fauvel
authors: Irstea, UR TSCF, Domaine des Palaquins, F-03150 Montoldre, France.
authors: J
authors: J
authors: Clément
authors: Irstea, UR TSCF, Domaine des Palaquins, F-03150 Montoldre, France.
authors: J C
authors: JC
authors: Baudez
mesh_terms: D055590:Electromagnetic Phenomena; D008962:Models, Theoretical; D012212:Rheology; D012722:Sewage / Q000737:chemistry*; D013696:Temperature; D014783:Viscosity; D014865:Waste Disposal, Fluid
chemical_list: D012722:Sewage
keywords: Capacitance; Equivalent electrical circuit; Infinite viscosity; Sewage sludge; Temperature; Viscoelastic properties