Abstract

A multispecies biofilm model is developed for simultaneous reduction of nitrate and perchlorate in the H 2-based membrane biofilm reactor. The one-dimension model includes dual-substrate Monod kinetics for a steady-state biofilm with five solid and five dissolved components. The solid components are autotrophic denitrifying bacteria, autotrophic perchlorate-reducing bacteria, heterotrophic bacteria, inert biomass, and extracellular polymeric substances (EPS). The dissolved components are nitrate, perchlorate, hydrogen (H 2), substrate-utilization-associated products, and biomass-associated products (BAP). The model explicitly considers four mechanisms involved in how three important operating conditions (H 2 pressure, nitrate loading, and perchlorate loading) affect nitrate and perchlorate removals: (1) competition for H 2, (2) promotion of PRB growth due to having two electron acceptors (nitrate and perchlorate), (3) competition between nitrate and perchlorate reduction for the same resources in the PRB: electrons and possibly reductase enzymes, and (4) competition for space in the biofilm. Two other special features are having H 2 delivered from the membrane substratum and solving directly for steady state using a novel three-step approach: finite-difference for approximating partial differential and/or integral equations, Newton-Raphson for solving nonlinear equations, and an iterative scheme to obtain the steady-state biofilm thickness. An example result illustrates the model's features.

Original languageEnglish (US)
Pages (from-to)1598-1607
Number of pages10
JournalEnvironmental Science and Technology
Volume46
Issue number3
DOIs
StatePublished - Feb 7 2012

Fingerprint

perchlorate
Biofilms
Nitrates
biofilm
nitrate
Bacteria
bacterium
Biomass
membrane
Membranes
substrate
electron
Electrons
biomass
Substrates
development model
Nonlinear equations
Integral equations
Hydrogen
Oxidoreductases

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

@article{1b97fa0df3ae44eaa2737121565c1c62,
title = "A steady-state biofilm model for simultaneous reduction of nitrate and perchlorate, part 1: Model development and numerical solution",
abstract = "A multispecies biofilm model is developed for simultaneous reduction of nitrate and perchlorate in the H 2-based membrane biofilm reactor. The one-dimension model includes dual-substrate Monod kinetics for a steady-state biofilm with five solid and five dissolved components. The solid components are autotrophic denitrifying bacteria, autotrophic perchlorate-reducing bacteria, heterotrophic bacteria, inert biomass, and extracellular polymeric substances (EPS). The dissolved components are nitrate, perchlorate, hydrogen (H 2), substrate-utilization-associated products, and biomass-associated products (BAP). The model explicitly considers four mechanisms involved in how three important operating conditions (H 2 pressure, nitrate loading, and perchlorate loading) affect nitrate and perchlorate removals: (1) competition for H 2, (2) promotion of PRB growth due to having two electron acceptors (nitrate and perchlorate), (3) competition between nitrate and perchlorate reduction for the same resources in the PRB: electrons and possibly reductase enzymes, and (4) competition for space in the biofilm. Two other special features are having H 2 delivered from the membrane substratum and solving directly for steady state using a novel three-step approach: finite-difference for approximating partial differential and/or integral equations, Newton-Raphson for solving nonlinear equations, and an iterative scheme to obtain the steady-state biofilm thickness. An example result illustrates the model's features.",
author = "Youneng Tang and Heping Zhao and Andrew Marcus and Rosa Krajmalnik-Brown and Bruce Rittmann",
year = "2012",
month = "2",
day = "7",
doi = "10.1021/es203129s",
language = "English (US)",
volume = "46",
pages = "1598--1607",
journal = "Environmental Science & Technology",
issn = "0013-936X",
publisher = "American Chemical Society",
number = "3",

}

TY - JOUR

T1 - A steady-state biofilm model for simultaneous reduction of nitrate and perchlorate, part 1

T2 - Model development and numerical solution

AU - Tang, Youneng

AU - Zhao, Heping

AU - Marcus, Andrew

AU - Krajmalnik-Brown, Rosa

AU - Rittmann, Bruce

PY - 2012/2/7

Y1 - 2012/2/7

N2 - A multispecies biofilm model is developed for simultaneous reduction of nitrate and perchlorate in the H 2-based membrane biofilm reactor. The one-dimension model includes dual-substrate Monod kinetics for a steady-state biofilm with five solid and five dissolved components. The solid components are autotrophic denitrifying bacteria, autotrophic perchlorate-reducing bacteria, heterotrophic bacteria, inert biomass, and extracellular polymeric substances (EPS). The dissolved components are nitrate, perchlorate, hydrogen (H 2), substrate-utilization-associated products, and biomass-associated products (BAP). The model explicitly considers four mechanisms involved in how three important operating conditions (H 2 pressure, nitrate loading, and perchlorate loading) affect nitrate and perchlorate removals: (1) competition for H 2, (2) promotion of PRB growth due to having two electron acceptors (nitrate and perchlorate), (3) competition between nitrate and perchlorate reduction for the same resources in the PRB: electrons and possibly reductase enzymes, and (4) competition for space in the biofilm. Two other special features are having H 2 delivered from the membrane substratum and solving directly for steady state using a novel three-step approach: finite-difference for approximating partial differential and/or integral equations, Newton-Raphson for solving nonlinear equations, and an iterative scheme to obtain the steady-state biofilm thickness. An example result illustrates the model's features.

AB - A multispecies biofilm model is developed for simultaneous reduction of nitrate and perchlorate in the H 2-based membrane biofilm reactor. The one-dimension model includes dual-substrate Monod kinetics for a steady-state biofilm with five solid and five dissolved components. The solid components are autotrophic denitrifying bacteria, autotrophic perchlorate-reducing bacteria, heterotrophic bacteria, inert biomass, and extracellular polymeric substances (EPS). The dissolved components are nitrate, perchlorate, hydrogen (H 2), substrate-utilization-associated products, and biomass-associated products (BAP). The model explicitly considers four mechanisms involved in how three important operating conditions (H 2 pressure, nitrate loading, and perchlorate loading) affect nitrate and perchlorate removals: (1) competition for H 2, (2) promotion of PRB growth due to having two electron acceptors (nitrate and perchlorate), (3) competition between nitrate and perchlorate reduction for the same resources in the PRB: electrons and possibly reductase enzymes, and (4) competition for space in the biofilm. Two other special features are having H 2 delivered from the membrane substratum and solving directly for steady state using a novel three-step approach: finite-difference for approximating partial differential and/or integral equations, Newton-Raphson for solving nonlinear equations, and an iterative scheme to obtain the steady-state biofilm thickness. An example result illustrates the model's features.

UR - http://www.scopus.com/inward/record.url?scp=84863012754&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84863012754&partnerID=8YFLogxK

U2 - 10.1021/es203129s

DO - 10.1021/es203129s

M3 - Article

C2 - 22191376

AN - SCOPUS:84863012754

VL - 46

SP - 1598

EP - 1607

JO - Environmental Science & Technology

JF - Environmental Science & Technology

SN - 0013-936X

IS - 3

ER -