Thixotropic behaviour of thickened sewage sludge

Journal of Environmental Health Science Engineering

Petr Junga¹  Petr Trávníček¹ 

[1] Department of Agricultural, Food and Environmental Engineering, Mendel University in Brno, Zemedelska 1, 613 00 Brno, Czech Republic

关键词: Pressure flotation;    Sewage sludge;    Herschel-Bulkley;    Mathematical model;    Rheology;   

Others  :  804951
DOI  :  10.1186/2052-336X-12-72

 received in 2013-04-26, accepted in 2014-04-12,  发布年份 2014

【 摘 要 】

The aim of the work is a description of the rheological behaviour of thickened sewage sludge. The sample of thickened sludge was collected from the wastewater treatment plant, where pressure flotation unit is used for a process of thickening. The value of dry matter of collected sample was 3.52%. Subsequently the sample was diluted and the rheological properties of individual samples were obtained. Several types of rheological tests were used for the determination of the sample. At first the hysteresis loop test was performed. The next test was focused on the time-dependency, i.e. measurement of dependence of dynamic viscosity on the time at constant shear rate. Further dependence dynamic viscosity on the temperature was performed. Then the activation energy was obtained from measured values. Finally, the hysteresis areas were counted and measured values were evaluated with use of Herschel-Bulkley mathematical model.

【 授权许可】

   
2014 Trávníček and Junga; licensee BioMed Central Ltd.

【 图 表 】

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