A Generalized Model for Aerobic Granule-based Sequencing Batch Reactor. 1. Model Development

Abstract

A generalized model was established for simulating an aerobic granule-based sequencing batch reactor (SBR) with considerations of biological processes, reactor hydrodynamics, mass transfer, and diffusion. Methodology of discretization was effectively used forthe model development and calculations. The activated sludge model no.1 was modified to describe the biological processes within the granules. Based on the difference between the calculated and measured results, the model structure was further improved through introducing simultaneous consumption of soluble substrates by storage and heterotrophs growth with a changeable reaction rate. Model calculations were conducted using a MATLAB program. The calculation results show the respective contributions of granules in different size fractions and slices to the overall change of model component concentrations. Moreover, oxygen concentration profiles within granules and oxygen consumption rate varied in one operating cycle. This confirms the applicability and validity of the discretization method and the model structure.

Modelling aerobic granular SBR at variable COD/N ratios including accurate description of total solids concentration

“…As it is represented in Eq. (15), the porosity is dependent on the density of each solid fraction considered. A wide range of values for the density of different biomass types has been reported as presented in Table 3.…”

“…The accurate description of the soluble compounds by the vali- dated model had an additional worth due to the fact that the kinetic and stoichiometric parameters of the model were obtained from the literature (see Appendix B for more details). Comparatively, a significant number of kinetic and stoichiometric parameters were estimated or calibrated in other previous GSBR published models [15,19,20]. Moreover, this is the first model for granular biomass validated with several experiments with different COD/N ratio in the influent.…”

“…Using the experience in biofilm modelling one-dimensional (1D) models have been adapted to describe nutrient removal in aerobic granular SBR (GSBR). Su and Yu [15,16] used the ASM1 [17] describing the maximum specific growth rates of heterotrophic and Table 1 Operational conditions in the studied experimental periods: concentrations of organic matter (COD), ammonium (NH4 + ) and alkalinity (Alk) in the influent of the reactor and corresponding COD/N ratio, organic loading rate (OLR) and nitrogen loading rate (NLR). autotrophic bacteria with exponential functions, whose parameters were adjusted to describe the experimental nutrient removal observed in the reactor.…”

Mathematical simulating the process of aerobic granular sludge treating high carbon and nitrogen concentration wastewater

“…Hence, it may be simulated by adopting the modified activated sludge models (ASMs) [6]. The ASM models have been proven to be effective tools for intensive study of complex processes in the AGS technology [7][8][9][10][11]. ASM3 model [12] first incorporated the process of utilizing storage products for growth, which were first stored and then used as substrate.…”

A novel control strategy for enhancing biological N-removal in a granular sequencing batch reactor: A model-based study

“…In that sense, some researchers developed mathematical models describing the COD and N-removal via the nitrification and heterotrophic denitrification processes [13,25,26]. De Kreuk et al [15] introduced the biological phosphorus removal and studied the individual influence of some parameters (i.e.…”