Control of Nitrate Flow in Pre-Denitrification Systems using Long-Range Identification for Predictive Control

This paper is concerned with long-range adaptive predictive control of the biological nitrogen removal process in a pre-denitrification activated sludge plant. A control-oriented identification procedure is used for modelling a multi-step ahead (long-range) predictor using a reduced model of the nit...

Full description

Saved in:
Bibliographic Details
Main Authors: Lara, J.M.V., Milani, B.E.A.
Format: Conference Proceeding
Language:English
Subjects:
Adaptive control
Biological system modeling
Control systems
Effluents
Nitrogen
Plants (biology)
Predictive control
Predictive models
Programmable control
Wastewater
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper is concerned with long-range adaptive predictive control of the biological nitrogen removal process in a pre-denitrification activated sludge plant. A control-oriented identification procedure is used for modelling a multi-step ahead (long-range) predictor using a reduced model of the nitrate concentration at the plant anoxic zone, in the range required by the predictive controller. The optimal structure of the reduced model and its parameters are identified by an advanced regression orthogonal estimator, based on the Modified Gram-Schmidt algorithm. The proposed controller controls the internal nitrate recirculation flow in order to maintain a desired nitrate concentration set-point at the anoxic zone. Simulation results, using a benchmark model, compare the performance of the proposed adaptive predictive controller against the performance of a well tuned PI controller, showing that the proposed controller presents much better external pro- cess disturbances attenuation and equivalent set-point tracking ability.
ISSN:0191-2216
DOI:10.1109/CDC.2005.1582628