Alexandru Rares Popescu, Vasile Lavric<br>A New Approach in Modelling the Flocs from Biological <br>Wastewater Treatment Bioreactors

Alexandru Rares Popescu, Vasile Lavric
A New Approach in Modelling the Flocs from Biological
Wastewater Treatment Bioreactors

Abstract:

We present a new hybrid technique aimed to model the floc formation, growth and divers distribution. Our approach is adapted from individual based modeling concepts, using the notion of fundamental building bloc - the grid cell, defined as the lowest volume/surface of the grid enclosing the nascent floc for which the continuum properties are still valid, like concentration of microorganisms, ordinary diffusion etc. Then the available and forbidden vicinities are used to guide the growth of microorganisms in clusters (contiguous building blocks). They expand single free vicinity by single free vicinity as they grow, the next location being randomly selected among all the available vicinities. Attachment is another asset of the model - at a given time interval, whose length depends upon the velocity field of the environment, a fundamental building block comes from the environment and gets fixed to the outskirts of the nascent floc. These simple steps are combined with the mass balance equations for the substrates present in the system and the kinetics describing the biological process. The model is capable of qualitatively reproducing the cross section distribution of flocs, as observed through FISH imagery. Keywords: floc modelling, diffusion, population community, random formation, attachment, detachment

Issue: 2010, Volume 61, Issue 2

Pages:

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This article is published under the Creative Commons Attribution 4.0 International License

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