Parameter identifiablity in the IAWQ Model No. 1 for modelling activated sludge plants for enhanced nitrogen removal

Weijers, SR Stefan; Kok, JJ Jan; Preisig, HA Heinz; Buunen, A.; Wouda, Twm

doi:10.1016/0098-1354(96)00249-9

Cited by 14 publications

(10 citation statements)

References 16 publications

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“…The rank of the FIM gives an indication of the theoretical parameter identifiability because this matrix represents an approximation of the Hessian matrix of the cost function (J ). In this study, FIM was found to be nonsingular so the model is locally identifiable (Weijers et al, 1996) and, hence, these eight parameters are practically identifiable with the experimental data of this work. Then, the inverse of FIM was calculated to achieve the estimation uncertainty of the parameters according to the procedure described in Dochain and Vanrolleghem (2001).…”

Section: Anaerobic/aerobic (Anox) Experimentsmentioning

confidence: 56%

Aerobic phosphorus release linked to acetate uptake in bio‐P sludge: Process modeling using oxygen uptake rate

Guisasola

Pijuan

Baeza

et al. 2004

Biotech & Bioengineering

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The main processes involved in enhanced biological phosphorus removal (EBPR) under anaerobic and subsequently aerobic conditions are widely described in the literature. Polyphosphate accumulating organisms (PAO) are the organisms responsible for this process. However, the mechanisms of PAO are not fully established yet under conditions that differ from the classical anaerobic/aerobic conditions. In this work, we made a comparison between the behavior of PAO under classical EBPR conditions and its behavior when consuming substrate under only aerobic conditions. In addition, oxygen uptake rate (OUR) was measured in the set of experiments under aerobic conditions to improve the characterization of the process. A kinetic and stoichiometric model based on Activated Sludge Model No.2 (ASM2) and including glycogen economy (AnOx model), calibrated for classical anaerobic/aerobic conditions, was not able to describe the experimental data since it underestimated the acetate consumption, the PHB storage, and the OUR. Two different hypotheses for describing the experimental measurements were proposed and modeled. Both hypotheses considered that PAO, under aerobic conditions, uptake acetate coupled to PHB storage, glycogen degradation, and phosphorus release as in anaerobic conditions. Moreover, the first hypothesis (PAO-hypothesis) considered that PAO were able to store acetate as PHB linked to oxygen consumption and the second one (OHO hypothesis) considered that this storage was due to ordinary heterotrophic organisms (OHO). Both hypotheses were evaluated by simulation extending the AnOx model with additional equations. The main differences observed were the predictions for PHB degradation during the famine phase and the OUR profile during both feast and famine phases. The OHO hypothesis described the experimental profiles more accurately than the PAO hypothesis.

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Section: Anaerobic/aerobic (Anox) Experimentsmentioning

confidence: 56%

Aerobic phosphorus release linked to acetate uptake in bio‐P sludge: Process modeling using oxygen uptake rate

Guisasola

Pijuan

Baeza

et al. 2004

Biotech & Bioengineering

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“…In this study we have attempted to gather and summarise the information needed to achieve a successful model calibration. The set of information listed below was extracted and combined from different sources (Henze et al 1987;Lesouef et al 1992;Pedersen & Sinkjaer 1992;Siegrist & Tschui 1992;Stokes et al 1993;de la Sota et al 1994;Dupont & Sinkjaer 1994;Weijers et al 1996;Xu & Hultman 1996;Kristensen et al 1998):…”

Section: Group On Mathematical Modelling For Design Andmentioning

confidence: 99%

Evaluation of an ASM1 model calibration procedure on a municipal–industrial wastewater treatment plant

Petersen

Gernaey

Henze

et al. 2002

Journal of Hydroinformatics

141

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The purpose of the calibrated model determines how to approach a model calibration, e.g. which information is needed and to which level of detail the model should be calibrated. A systematic model calibration procedure was therefore defined and evaluated for a municipal–industrial wastewater treatment plant. In the case that was studied it was important to have a detailed description of the process dynamics, since the model was to be used as the basis for optimisation scenarios in a later phase. Therefore, a complete model calibration procedure was applied including: (1) a description of the hydraulics in the system via a tracer test, (2) an intensive measuring campaign and (3) supporting lab-scale experiments to obtain and confirm kinetic parameters for the model. In this paper the model calibration procedure for this case study is described step by step, and the importance of the different steps is discussed. The calibrated model was evaluated via a sensitivity analysis on the influence of model parameters and influent component concentrations on the model output. The sensitivity analysis confirmed that the model output was sensitive to the parameters that were modified from the default parameter values. The calibrated model was finally reduced from a 24 tanks-in-series configuration to a 12 tanks-in-series configuration, resulting in a 50% reduction of the simulation time.

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“…The amount of nonremovable fraction (Weijers et al 1996 ). The denitrifi cation process involves the biological reduction of nitrate and/or nitrite to nitrogen gas in the absence of dissolved oxygen.…”

Section: Nitrogen Removalmentioning

confidence: 99%

Clean Strategies for the Management of Residues in Dairy Industries

Tommaso

Ribeiro

Oliveira

et al. 2011

Novel Technologies in Food Science

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Parameter identifiablity in the IAWQ Model No. 1 for modelling activated sludge plants for enhanced nitrogen removal

Cited by 14 publications

References 16 publications

Aerobic phosphorus release linked to acetate uptake in bio‐P sludge: Process modeling using oxygen uptake rate

Aerobic phosphorus release linked to acetate uptake in bio‐P sludge: Process modeling using oxygen uptake rate

Evaluation of an ASM1 model calibration procedure on a municipal–industrial wastewater treatment plant

Clean Strategies for the Management of Residues in Dairy Industries

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