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Effect of sensor location on controller performance in a wastewater treatment plant

Usman Rehman UGent, Mehul Vesvikar UGent, Thomas Maere, L Guo, Peter A Vanrolleghem and Ingmar Nopens UGent (2015) WATER SCIENCE AND TECHNOLOGY. 71(5). p.700-708
abstract
Complete mixing is hard to achieve in large bioreactors in wastewater treatment plants. This often leads to a non-uniform distribution of components such as dissolved oxygen and, hence, the process rates depend on them. Furthermore, when these components are used as input for a controller, the location of the sensor can potentially affect the control action. In this contribution, the effect of sensor location and the choice of setpoint on the controller performance were examined for a non-homogeneously mixed pilot bioreactor described by a compartmental model. The impacts on effluent quality and aeration cost were evaluated. It was shown that a dissolved oxygen controller with a fixed setpoint performs differently as a function of the location of the sensor. When placed in a poorly mixed location, the controller increases the aeration intensity to its maximum capacity leading to higher aeration costs. When placed just above the aerated zone, the controller decreases the aeration rate resulting in lower dissolved oxygen concentrations in the remainder of the system, compromising effluent quality. In addition to the location of the sensor, the selection of an appropriate setpoint also impacts controller behavior. This suggests that mixing behavior of bioreactors should be better quantified for proper sensor location and controller design.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
compartmental modeling, activated sludge process, instrumentation, mixing, process control, ACTIVATED-SLUDGE PROCESS, CONTROL STRATEGIES, NITROGEN REMOVAL, AERATION SYSTEMS, OPERATING COSTS, CFD SIMULATION, REACTOR, MODEL, HYDRODYNAMICS, BENCHMARK
journal title
WATER SCIENCE AND TECHNOLOGY
Water Sci. Technol.
volume
71
issue
5
pages
700 - 708
Web of Science type
Article
Web of Science id
000351218900007
JCR category
WATER RESOURCES
JCR impact factor
1.064 (2015)
JCR rank
54/85 (2015)
JCR quartile
3 (2015)
ISSN
0273-1223
DOI
10.2166/wst.2014.525
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
5931383
handle
http://hdl.handle.net/1854/LU-5931383
date created
2015-04-14 09:55:55
date last changed
2016-12-19 15:39:13
@article{5931383,
  abstract     = {Complete mixing is hard to achieve in large bioreactors in wastewater treatment plants. This often leads to a non-uniform distribution of components such as dissolved oxygen and, hence, the process rates depend on them. Furthermore, when these components are used as input for a controller, the location of the sensor can potentially affect the control action. In this contribution, the effect of sensor location and the choice of setpoint on the controller performance were examined for a non-homogeneously mixed pilot bioreactor described by a compartmental model. The impacts on effluent quality and aeration cost were evaluated. It was shown that a dissolved oxygen controller with a fixed setpoint performs differently as a function of the location of the sensor. When placed in a poorly mixed location, the controller increases the aeration intensity to its maximum capacity leading to higher aeration costs. When placed just above the aerated zone, the controller decreases the aeration rate resulting in lower dissolved oxygen concentrations in the remainder of the system, compromising effluent quality. In addition to the location of the sensor, the selection of an appropriate setpoint also impacts controller behavior. This suggests that mixing behavior of bioreactors should be better quantified for proper sensor location and controller design.},
  author       = {Rehman, Usman and Vesvikar, Mehul and Maere, Thomas and Guo, L and Vanrolleghem, Peter A and Nopens, Ingmar},
  issn         = {0273-1223},
  journal      = {WATER SCIENCE AND TECHNOLOGY},
  keyword      = {compartmental modeling,activated sludge process,instrumentation,mixing,process control,ACTIVATED-SLUDGE PROCESS,CONTROL STRATEGIES,NITROGEN REMOVAL,AERATION SYSTEMS,OPERATING COSTS,CFD SIMULATION,REACTOR,MODEL,HYDRODYNAMICS,BENCHMARK},
  language     = {eng},
  number       = {5},
  pages        = {700--708},
  title        = {Effect of sensor location on controller performance in a wastewater treatment plant},
  url          = {http://dx.doi.org/10.2166/wst.2014.525},
  volume       = {71},
  year         = {2015},
}

Chicago
Rehman, Usman, Mehul Vesvikar, Thomas Maere, L Guo, Peter A Vanrolleghem, and Ingmar Nopens. 2015. “Effect of Sensor Location on Controller Performance in a Wastewater Treatment Plant.” Water Science and Technology 71 (5): 700–708.
APA
Rehman, U., Vesvikar, M., Maere, T., Guo, L., Vanrolleghem, P. A., & Nopens, I. (2015). Effect of sensor location on controller performance in a wastewater treatment plant. WATER SCIENCE AND TECHNOLOGY, 71(5), 700–708.
Vancouver
1.
Rehman U, Vesvikar M, Maere T, Guo L, Vanrolleghem PA, Nopens I. Effect of sensor location on controller performance in a wastewater treatment plant. WATER SCIENCE AND TECHNOLOGY. 2015;71(5):700–8.
MLA
Rehman, Usman, Mehul Vesvikar, Thomas Maere, et al. “Effect of Sensor Location on Controller Performance in a Wastewater Treatment Plant.” WATER SCIENCE AND TECHNOLOGY 71.5 (2015): 700–708. Print.