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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Druckformat: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v38.i5.70
pages 458-478

Mathematical Modeling of a Secondary Clarifier with Cone-Shaped Bottom

N. Stepova
Institute of Hydromechanics of National Academy of Sciences of Ukraine Zhelyabov St., 8/4, Kyiv-180 MSP, 03680, Ukraine
Yu. I. Kalugin
Institute of Hydromechanics of National Academy of Sciences of Ukraine, Kyiv, Ukraine

ABSTRAKT

A 1D mathematical model for a secondary clarifier with cone-shaped bottom and its numerical solution via the Cauchy−Euler method are presented in the paper. The model includes, among other parameters, the relationship between the velocity of hydraulic flux and clarifier cross-sectional area. A computer code to calculate suspended solids profiles in the clarifier in different time moments is developed along with a computer code for the visualization of obtained data. Some examples to illustrate the model possibilities are presented. The state of the art of secondary clarifier modeling is given in the paper. Different expressions to estimate the activated sludge settling velocity are studied, for settling velocity is an integral part of every clarifier model.


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