In recent years the grey-box modelling approach has been applied to wastewater transportation and treatment. Grey-box models are characterized by the combination of deterministic and stochastic terms to form a model where all the parameters are statistically identifiable from the on-line measurements. With respect to the development of software sensors, the grey-box models possess two important features. Firstly, the on-line measurements can be filtered according to the grey-box model in order to remove noise deriving from the measuring equipment and controlling devices. Secondly, the grey-box models may contain terms which can be estimated on-line by use of the models and measurements. In this paper, it is demonstrated that many storage basins in sewer systems can be used as an on-line flow measurement, provided that the basin is monitored on-line with a level transmitter and that a grey-box model for the specific dynamics is identified. Similarly, an on-line software sensor for detecting the occurrence of backwater phenomena can be developed by comparing the dynamics of a flow measurement with a nearby level measurement. For treatment plants it is found that grey-box models applied to on-line ammonia measurements from the aeration tank of an alternating plant provide information on the incoming ammonia load. It is also shown how measurements of the return sludge concentration from a secondary clarifier can be filtered to minimize the effect of the scraper. Thus, important information can be derived from on-line measurements if the appropriate grey-box model for the specific system is identified.
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January 01 1996
Software sensors based on the grey-box modelling approach Available to Purchase
Jacob Carstensen;
Jacob Carstensen
*Institute of Environmental Science & Engineering, Technical University of Denmark, Building 115, DK-2800 Lyngby, Denmark
**R&D Division, Krüger A/S, Gladsaxevej 363, DK-2860 Søborg, Denmark
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Poul Harremoës;
Poul Harremoës
*Institute of Environmental Science & Engineering, Technical University of Denmark, Building 115, DK-2800 Lyngby, Denmark
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Rune Strube
Rune Strube
**R&D Division, Krüger A/S, Gladsaxevej 363, DK-2860 Søborg, Denmark
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Water Sci Technol (1996) 33 (1): 117–126.
Citation
Jacob Carstensen, Poul Harremoës, Rune Strube; Software sensors based on the grey-box modelling approach. Water Sci Technol 1 January 1996; 33 (1): 117–126. doi: https://doi.org/10.2166/wst.1996.0011
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