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Bioprocess and Biosystems Engineering

, Volume 41, Issue 11, pp 1573–1587 | Cite as

Modeling and dynamic simulation of a two-stage pre-denitrification MBBR system under increasing organic loading rates

  • Hudson B. Carminati
  • Paula S. Lima
  • Argimiro R. Secchi
  • João P. Bassin
Research Paper
  • 85 Downloads

Abstract

Biofilm-based wastewater treatment systems have become attractive due to their numerous advantages when compared to other suspended growth processes. However, the mathematical modeling of these reactors is relatively complex, since it has to consider a wide range of phenomena to accurately describe the process behavior. This work deals with the modeling of a two-stage MBBR system run in pre-denitrification mode for the removal of organic matter and nitrogen from wastewater. The model development took into account diffusive phenomena and kinetics in a homogeneous biofilm composed of different bacterial functional groups (namely heterotrophs and nitrifiers). The thickness of the biofilm was treated as a variable, given that detachment of adhered biomass took place. The suspended biomass fraction was also considered to remove the pollutants by means of Monod-type kinetics associated with the activated sludge model. The dynamic behavior of the components involved in the system and their spatial distribution in the biofilm obtained from simulated data showed good agreement with those reported in the literature, demonstrating the reproducibility of the model and encouraging future applications in full-scale MBBR plants.

Keywords

Moving-bed biofilm reactor Biofilm Nitrogen removal Dynamic simulation 

Abbreviation

List of symbols

A

Biofilm surface area (L2)

b

Decay rate (T−1)

S

Soluble substrate concentration (M L−3)

Cm

Saturating concentration of oxygen in the liquid phase (M L−3)

D

Diffusion coefficient (L2 T−1)

f

Biomass fraction in the biofilm

fp

Fraction of the inert biomass in the inactive portion of the biofilm

ixb

N/COD mass ratio

k

External mass transfer coefficient (L2 T−1)

K

Half-saturation coefficient (M L−3)

kLa

Oxygen mass transfer coefficient (T−1)

L

Biofilm thickness (L)

m

Mass of biomass (M)

MMi

Molecular weight (M N−1)

P

Pressure (M L−1 T−2)

Q

Flowrate (L3 T−1)

r

Conversion rate (M L−3 T−1)

R

Universal constant of gases (M L2 T−2 Θ−1 N−1)

t

Time (T)

T

Temperature (θ)

V

Reactor volume (L3)

X

Biomass concentration (M L−3)

x

Molar fraction

Y

Yield coefficient

z

Spatial variable in the biofilm (L)

δ

Boundary layer thickness (L)

λ

Shear loss rate (T−1)

μ

Maximum specific rate (T−1)

ν

Stoichiometric coefficient

ρM

Biofilm mean density (M L−3)

ρ

Process rate (M L−3)

Subscripts

1

Anoxic reactor

2

Aerobic reactor

a

Anoxic process

f

Anaerobic process

h

Hydrolysis process

o

Aerobic process

A

Autotrophic biomass

H

Heterotrophic biomass

I

Inert biomass

NH

Ammonia

NO

Nitrate nitrogen

O2

Oxygen

S

Readily or slowly biodegradable substrate

air

Feed air

in

Influent stream

eq

Equilibrium condition

i

Component (soluble or biomass)

j

Process

Superscripts

B

Biofilm phase

G

Gas phase

I

Interface biofilm-bulk

L

Bulk phase

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Hudson B. Carminati
    • 1
  • Paula S. Lima
    • 1
  • Argimiro R. Secchi
    • 1
  • João P. Bassin
    • 1
  1. 1.Chemical Engineering Program, COPPEUniversidade Federal do Rio de JaneiroRio de JaneiroBrazil

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