Irstea, UR TSCF, Domaine des Palaquins, F-03150 Montoldre, France.
Irstea, UR TSCF, Domaine des Palaquins, F-03150 Montoldre, France.
Water Res. 2015 Apr 15;73:1-8. doi: 10.1016/j.watres.2015.01.004. Epub 2015 Jan 13.
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.
流变性是污水污泥管理的关键标准，但难以在现场进行测定。由于文献通常将流变特性与相互作用的颗粒表面电荷联系起来，因此潜在的静电相互作用可能是解释污泥流变性的关键特性。本文分析了温度对流变和电学性质的影响。液体和固体性质似乎都与电阻抗谱测量有关，因为它们与相同的激活能遵循相同的关系。无限粘度遵循阿伦尼乌斯定律随温度变化，而储能模量则表现出 Vogel-Tamman-Fulcher 行为。污泥的电学行为可以通过一个等效的 2 分支并联电路进行建模，其各自的阻抗遵循阿伦尼乌斯和 Vogel-Tamman-Fulcher 关系。更有趣的是，电阻与（耗散）粘性特性成正比，而电容与（储能）弹性模量成正比。这些相似性和关系基于涉及流变和电学性质的相同相互作用。这些相互依存关系非常合乎逻辑，但为污泥特性描述开辟了新的视角。
