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Evaluation of plant-wide WWTP control strategies including the effects of filamentous bulking sludge

Flores-Alsina, Xavier; Comas, Joaquim; Rodriguez Roda, Ignasi; Poch, Manel; Gernaey, Krist V. and Jeppsson, Ulf LU (2009) In Water Science and Technology 60(8). p.2093-2103
Abstract
The main objective of this paper is to evaluate the effect of filamentous bulking sludge on the predicted performance of simulated plant-wide WWTP control strategies. First, as a reference case, several control strategies are implemented, simulated and evaluated using the IWA Benchmark Simulation Model No. 2 (BSM2). In a second series of simulations the parameters of the secondary settler model in the BSM2 are automatically changed on the basis of an on-line calculated risk of filamentous bulking, in order to mimic the effect of growth of filamentous bacteria in the plant. The results are presented using multivariate analysis. Including the effects of filamentous bulking in the simulation model gives a-more realistic-deterioration of the... (More)
The main objective of this paper is to evaluate the effect of filamentous bulking sludge on the predicted performance of simulated plant-wide WWTP control strategies. First, as a reference case, several control strategies are implemented, simulated and evaluated using the IWA Benchmark Simulation Model No. 2 (BSM2). In a second series of simulations the parameters of the secondary settler model in the BSM2 are automatically changed on the basis of an on-line calculated risk of filamentous bulking, in order to mimic the effect of growth of filamentous bacteria in the plant. The results are presented using multivariate analysis. Including the effects of filamentous bulking in the simulation model gives a-more realistic-deterioration of the plant performance during periods when the conditions for development of filamentous bulking sludge are favourable: compared to the reference case where bulking effects are not considered. Thus, there is a decrease of the overall settling velocity, an accumulation of the total suspended solids (TSS) in the middle layers of the settler with a consequent reduction of their degree of compaction in the bottom. As a consequence there is a lower TSS concentration in both return and waste flow, less biomass in the bioreactors and a reduction of the TSS removal efficiency. The control alternatives using a TSS controller substantially increase the food to microorganisms (F/M) ratio in the bioreactor, thereby reducing both risk and effects of bulking sludge. The effects of ammonium (NH4+), nitrate (NO3-) and reject water control strategies are rather poor when it comes to handling solids separation problems. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
principal, filamentous bulking sludge model, benchmarking, BSM2, components analysis, settling parameters
in
Water Science and Technology
volume
60
issue
8
pages
2093 - 2103
publisher
IWA Publishing
external identifiers
  • wos:000271269500017
  • scopus:73349095084
ISSN
0273-1223
DOI
10.2166/wst.2009.523
language
English
LU publication?
yes
id
12bf7f48-cf00-4b23-a7d8-c36cc79d5ca9 (old id 1504693)
date added to LUP
2009-11-25 10:14:15
date last changed
2017-01-01 05:21:13
@article{12bf7f48-cf00-4b23-a7d8-c36cc79d5ca9,
  abstract     = {The main objective of this paper is to evaluate the effect of filamentous bulking sludge on the predicted performance of simulated plant-wide WWTP control strategies. First, as a reference case, several control strategies are implemented, simulated and evaluated using the IWA Benchmark Simulation Model No. 2 (BSM2). In a second series of simulations the parameters of the secondary settler model in the BSM2 are automatically changed on the basis of an on-line calculated risk of filamentous bulking, in order to mimic the effect of growth of filamentous bacteria in the plant. The results are presented using multivariate analysis. Including the effects of filamentous bulking in the simulation model gives a-more realistic-deterioration of the plant performance during periods when the conditions for development of filamentous bulking sludge are favourable: compared to the reference case where bulking effects are not considered. Thus, there is a decrease of the overall settling velocity, an accumulation of the total suspended solids (TSS) in the middle layers of the settler with a consequent reduction of their degree of compaction in the bottom. As a consequence there is a lower TSS concentration in both return and waste flow, less biomass in the bioreactors and a reduction of the TSS removal efficiency. The control alternatives using a TSS controller substantially increase the food to microorganisms (F/M) ratio in the bioreactor, thereby reducing both risk and effects of bulking sludge. The effects of ammonium (NH4+), nitrate (NO3-) and reject water control strategies are rather poor when it comes to handling solids separation problems.},
  author       = {Flores-Alsina, Xavier and Comas, Joaquim and Rodriguez Roda, Ignasi and Poch, Manel and Gernaey, Krist V. and Jeppsson, Ulf},
  issn         = {0273-1223},
  keyword      = {principal,filamentous bulking sludge model,benchmarking,BSM2,components analysis,settling parameters},
  language     = {eng},
  number       = {8},
  pages        = {2093--2103},
  publisher    = {IWA Publishing},
  series       = {Water Science and Technology},
  title        = {Evaluation of plant-wide WWTP control strategies including the effects of filamentous bulking sludge},
  url          = {http://dx.doi.org/10.2166/wst.2009.523},
  volume       = {60},
  year         = {2009},
}