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

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Author

Summary, in English

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.

Publishing year

2002

Language

English

Pages

453-460

Publication/Series

Water Science and Technology

Volume

45

Issue

4-5

Document type

Journal article

Publisher

IWA Publishing

Topic

  • Other Electrical Engineering, Electronic Engineering, Information Engineering

Keywords

  • pre-denitrification plant
  • full-scale
  • control
  • activated sludge process
  • aeration
  • nitrogen removal
  • nutrient sensors

Status

Published

ISBN/ISSN/Other

  • ISSN: 0273-1223