Biological nutrient removal model No.1 (BNRM1)

Abstract

This paper presents the results of the work carried out by the CALAGUA Group on Mathematical Modelling of Biological Treatment Processes: the Biological Nutrient Removal Model No.1. This model is based on a new concept for dynamic simulation of wastewater treatment plants: a unique model can be used to design, simulate and optimize the whole plant, as it includes most of the biological and physico-chemical processes taking place in all treatment operations. The physical processes included are: settling and clarification processes (flocculated settling, hindered settling and thickening), volatile fatty acids elutriation and gas-liquid transfer. The chemical interactions included comprise acid-base processes, where equilibrium conditions are assumed. The biological processes included are: organic matter, nitrogen and phosphorus removal; acidogenesis, acetogenesis and methanogenesis. Environmental conditions in each operation unit (aerobic, anoxic or anaerobic) will determine which bacterial groups can grow. Thus, only the model parameters related to bacterial groups able to grow in any of the operation units of a specific WWTP will require calibration. One of the most important advantages of this model is that no additional analysis with respect to ASM2d is required for wastewater characterization. Some applications of this model have also been briefly explained in this paper.

Obtención de los principales parámetros del agua residual urbana empleados en los modelos matemáticos de fangos activados a partir de una caracterización analítica simple

“…Este modelo considera en total 27 componentes, 13 solubles y 14 particulados. En total el modelo BNRM1 incluye 30 procesos y supone que los realizan tres clases de microorganismos: las bacterias autótrofas, las bacterias heterótrofas y las bacterias acumuladores de polifosfatos PAO (Seco et al, 2004).…”

DSC: software tool for simulation-based design of control strategies applied to wastewater treatment plants

“…DESASS allows calculating the performance under steady or transient state of whole treatment schemes since it includes the plant-wide model Biological Nutrient Removal Model number 1 (BNRMl, Seco et al 2004) developed by CALAGUA research group. This model includes the most important physical, chemical and biological processes taking place in a WWTP.…”

Modelling a sequencing batch reactor to treat the supernatant from anaerobic digestion of the organic fraction of municipal solid waste

“…Oxygen supply and stripping of CO 2 and NH 3 were considered using the two-film theory as described by Magrí et al 28 K L a for CO 2 was based on K L a O2 by correcting it for different diffusion coefficients as reported by Hellinga et al 29 Stripping of NH 3 and Henry's law constants at 30 • C were determined by using the correlations proposed by Musvoto et al 30,31 Two new components, inorganic carbon and proton concentration, were defined in order to evaluate restrictions linked to alkalinity and pH limitations as described by Serralta et al 32 The pH dependency function (F pH ) for both autotrophic and heterotrophic biomass was included in the model combining Monod kinetics and non-competitive inhibition for H + concentration as proposed by Siegrist et al 33 and Seco et al 34 This mathematical expression is presented in Eqn (2) …”