Relations Among Sludge Rheological Properties And Operational Problems In An Industrial Zone Wastewater Treatment Plant

Baris Vural, Sezen Coskun


The main objective is to examine how the viscosity values change in order to solve the problems frequently encountered in transmission lines in this study. Sludge samples from chemical and biological treatment process were taken in two different stages of nearby industrial zone wastewater treatment plant (IZWWTP). Physical, chemical and rheological properties of sludge samples were investigated in two different seasonal periods (October and February). The pH, temperature, conductivity, total suspended solid, chemical oxygen demand and total volatile solids of the sludge samples were determined in the first phase of the study. In the second phase, the shear stress and viscosity of the samples were determined to different shear rates using Brookfield DV-II+Pro viscometer. The rheological behaviors were modelled using Bingham, Ostwald and Herschel-Bulkley. In operating periods when viscosity increases, alternative coagulants may be preferred, chemical type or amount may be changed in the chemical process. Sludge pumps within the facility should be selected according to the rheological properties of the treatment sludge. Seasonal operating measures to be taken according to rheological properties can reduce operating costs.


industrial wastewater sludge, modeling, non-Newtonian fluid, rheology, viscosity

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