Three-dimensional multi-species mathematical model of the aerobic granulation process based on cellular automata theory

Abstract

Aerobic granular sludge is a kind of microbial polymer formed by self-immobilization under aerobic conditions. It has been widely studied because of its promising application in wastewater treatment. However, the granulation process of aerobic sludge is still a key factor affecting its practical application. In this paper, a three-dimensional (3D) multi-species mathematical model of aerobic granular sludge was constructed using the cellular automata (CA) theory. The growth process of aerobic granular sludge and its spatial distribution of microorganisms were studied under different conditions. The simulation results show that the aerobic granules were smaller under high shear stress and that the autotrophic bacterial content of the granular sludge interior was higher. However, the higher the dissolved oxygen concentration, the larger the size of granular sludge and the higher the content of autotrophic bacteria in the interior of the granular sludge. In addition, inhibition of toxic substances made the aerobic granule size increase more slowly, and the spatial distribution of the autotrophic bacteria and the toxic-substance-degrading bacteria were mainly located in the outer layer, with the heterotrophic bacteria mainly existing in the interior of the granular sludge.

Modeling, instrumentation, automation, and optimization of water resource recovery facilities (Review of 2018 Literature) DIRECT

“…Zheng, Su, Zhang, Wang, and Wang (2018) developed simulation of aerobic granular sludge growth and distribution under various environments. Zhao, Yang, Li, and Hu (2018) developed an artificial neural network model to monitor and manage rural plant performance using conventional online sensors.…”

Zero‐dimensional modelling and bacterial characterization of an aerobic granular sludge reactor

“…More complex two‐dimensional (2D) and three‐dimensional (3D) models have also been formulated for AGS 14,15 . These 2D and 3D models describe the spatial structure of the granules in two and three dimensions.…”

“…More complex two-dimensional (2D) and three-dimensional (3D) models have also been formulated for AGS. 14,15 These 2D and 3D models describe the spatial structure of the granules in two and three dimensions. As with 1D models, these more complex models simulate the AGS structure and use intrinsic kinetic parameters; diffusion is modelled explicitly using Fick's laws.…”