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Challenges encountered when expanding activated sludge models: a case study based on N2O production.

Snip, L J P; Boiocchi, R; Flores, Xavier LU ; Jeppsson, Ulf LU and Gernaey, K V (2014) In Water Science and Technology 70(7). p.1251-1260
Abstract
It is common practice in wastewater engineering to extend standard activated sludge models (ASMs) with extra process equations derived from batch experiments. However, such experiments have often been performed under conditions different from the ones normally found in wastewater treatment plants (WWTPs). As a consequence, these experiments might not be representative for full-scale performance, and unexpected behaviour may be observed when simulating WWTP models using the derived process equations. In this paper we want to highlight problems encountered using a simplified case study: a modified version of the Activated Sludge Model No. 1 (ASM1) is upgraded with nitrous oxide (N2O) formation by ammonia-oxidizing bacteria. Four different... (More)
It is common practice in wastewater engineering to extend standard activated sludge models (ASMs) with extra process equations derived from batch experiments. However, such experiments have often been performed under conditions different from the ones normally found in wastewater treatment plants (WWTPs). As a consequence, these experiments might not be representative for full-scale performance, and unexpected behaviour may be observed when simulating WWTP models using the derived process equations. In this paper we want to highlight problems encountered using a simplified case study: a modified version of the Activated Sludge Model No. 1 (ASM1) is upgraded with nitrous oxide (N2O) formation by ammonia-oxidizing bacteria. Four different model structures have been implemented in the Benchmark Simulation Model No. 1 (BSM1). The results of the investigations revealed two typical difficulties: problems related to the overall mathematical model structure and problems related to the published set of parameter values. The paper describes the model implementation incompatibilities, the variability in parameter values and the difficulties of reaching similar conditions when simulating a full-scale activated sludge plant. Finally, the simulation results show large differences in oxygen uptake rates, nitritation rates and consequently the quantity of N2O emission (GN2O) using the different models. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Water Science and Technology
volume
70
issue
7
pages
1251 - 1260
publisher
IWA Publishing
external identifiers
  • wos:000344152400015
  • scopus:84908647923
ISSN
0273-1223
DOI
10.2166/wst.2014.347
language
English
LU publication?
yes
id
0815ed9c-3cba-419a-a3fe-051c038ddd05 (old id 4736713)
date added to LUP
2014-11-17 14:22:10
date last changed
2017-04-23 03:45:25
@article{0815ed9c-3cba-419a-a3fe-051c038ddd05,
  abstract     = {It is common practice in wastewater engineering to extend standard activated sludge models (ASMs) with extra process equations derived from batch experiments. However, such experiments have often been performed under conditions different from the ones normally found in wastewater treatment plants (WWTPs). As a consequence, these experiments might not be representative for full-scale performance, and unexpected behaviour may be observed when simulating WWTP models using the derived process equations. In this paper we want to highlight problems encountered using a simplified case study: a modified version of the Activated Sludge Model No. 1 (ASM1) is upgraded with nitrous oxide (N2O) formation by ammonia-oxidizing bacteria. Four different model structures have been implemented in the Benchmark Simulation Model No. 1 (BSM1). The results of the investigations revealed two typical difficulties: problems related to the overall mathematical model structure and problems related to the published set of parameter values. The paper describes the model implementation incompatibilities, the variability in parameter values and the difficulties of reaching similar conditions when simulating a full-scale activated sludge plant. Finally, the simulation results show large differences in oxygen uptake rates, nitritation rates and consequently the quantity of N2O emission (GN2O) using the different models.},
  author       = {Snip, L J P and Boiocchi, R and Flores, Xavier and Jeppsson, Ulf and Gernaey, K V},
  issn         = {0273-1223},
  language     = {eng},
  number       = {7},
  pages        = {1251--1260},
  publisher    = {IWA Publishing},
  series       = {Water Science and Technology},
  title        = {Challenges encountered when expanding activated sludge models: a case study based on N2O production.},
  url          = {http://dx.doi.org/10.2166/wst.2014.347},
  volume       = {70},
  year         = {2014},
}