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Dissolved oxygen controller based on on-line measurements of ammonia combining feed-forward and feedback

Ingildsen, P.; Jeppsson, Ulf LU and Olsson, Gustaf LU (2002) In Water Science and Technology 45(4-5). p.453-460
Abstract
As the largest single energy-consuming component in most biological wastewater treatment systems, control of aeration is of great interest seen from an energy savings point of view. This paper suggests a simple way of using on-line ammonium measurements to control aeration in a pre-denitrification plant by controlling the dissolved oxygen setpoint. The controller works primarily by feed-forward based on an ammonium sensor located at the head of the aerobic process part. Using online in-situ sensor measurements directly from the process have the important advantage over effluent measurements that there is no or very short time delay for information. The controller has been implemented in a full-scale wastewater treatment plant for a period... (More)
As the largest single energy-consuming component in most biological wastewater treatment systems, control of aeration is of great interest seen from an energy savings point of view. This paper suggests a simple way of using on-line ammonium measurements to control aeration in a pre-denitrification plant by controlling the dissolved oxygen setpoint. The controller works primarily by feed-forward based on an ammonium sensor located at the head of the aerobic process part. Using online in-situ sensor measurements directly from the process have the important advantage over effluent measurements that there is no or very short time delay for information. The controller has been implemented in a full-scale wastewater treatment plant for a period of 35 days. During the experiment two identical activated sludge lines were used. The controller was implemented in one line, while the other line worked as a reference for comparison. The preliminary results indicate that the described control strategy leads to energy savings for the aeration in the region of 5-15%, while maintaining approximately the same effluent quality as in the reference line. Even higher energy savings can probably be achieved by optimising the controller. An automatic procedure for updating the controller parameters based on dynamic effluent ammonium measurement has been tested. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Water Science and Technology
volume
45
issue
4-5
pages
453 - 460
publisher
IWA Publishing
external identifiers
  • Scopus:0036201307
ISSN
0273-1223
language
English
LU publication?
yes
id
2ca82841-4a1e-4215-93b7-8bef206d8c16 (old id 4391274)
alternative location
http://www.iwaponline.com/wst/04504/wst045040453.htm
date added to LUP
2014-04-09 15:31:25
date last changed
2016-11-20 04:23:40
@misc{2ca82841-4a1e-4215-93b7-8bef206d8c16,
  abstract     = {As the largest single energy-consuming component in most biological wastewater treatment systems, control of aeration is of great interest seen from an energy savings point of view. This paper suggests a simple way of using on-line ammonium measurements to control aeration in a pre-denitrification plant by controlling the dissolved oxygen setpoint. The controller works primarily by feed-forward based on an ammonium sensor located at the head of the aerobic process part. Using online in-situ sensor measurements directly from the process have the important advantage over effluent measurements that there is no or very short time delay for information. The controller has been implemented in a full-scale wastewater treatment plant for a period of 35 days. During the experiment two identical activated sludge lines were used. The controller was implemented in one line, while the other line worked as a reference for comparison. The preliminary results indicate that the described control strategy leads to energy savings for the aeration in the region of 5-15%, while maintaining approximately the same effluent quality as in the reference line. Even higher energy savings can probably be achieved by optimising the controller. An automatic procedure for updating the controller parameters based on dynamic effluent ammonium measurement has been tested.},
  author       = {Ingildsen, P. and Jeppsson, Ulf and Olsson, Gustaf},
  issn         = {0273-1223},
  language     = {eng},
  number       = {4-5},
  pages        = {453--460},
  publisher    = {ARRAY(0xc318128)},
  series       = {Water Science and Technology},
  title        = {Dissolved oxygen controller based on on-line measurements of ammonia combining feed-forward and feedback},
  volume       = {45},
  year         = {2002},
}