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Bioprocess and Biosystems Engineering

, Volume 37, Issue 7, pp 1271–1287 | Cite as

Activated sludge model 2d calibration with full-scale WWTP data: comparing model parameter identifiability with influent and operational uncertainty

  • Vinicius Cunha Machado
  • Javier Lafuente
  • Juan Antonio Baeza
Original Paper

Abstract

The present work developed a model for the description of a full-scale wastewater treatment plant (WWTP) (Manresa, Catalonia, Spain) for further plant upgrades based on the systematic parameter calibration of the activated sludge model 2d (ASM2d) using a methodology based on the Fisher information matrix. The influent was characterized for the application of the ASM2d and the confidence interval of the calibrated parameters was also assessed. No expert knowledge was necessary for model calibration and a huge available plant database was converted into more useful information. The effect of the influent and operating variables on the model fit was also studied using these variables as calibrating parameters and keeping the ASM2d kinetic and stoichiometric parameters, which traditionally are the calibration parameters, at their default values. Such an “inversion” of the traditional way of model fitting allowed evaluating the sensitivity of the main model outputs regarding the influent and the operating variables changes. This new approach is able to evaluate the capacity of the operational variables used by the WWTP feedback control loops to overcome external disturbances in the influent and kinetic/stoichiometric model parameters uncertainties. In addition, the study of the influence of operating variables on the model outputs provides useful information to select input and output variables in decentralized control structures.

Keywords

ASM2d EBPR FIM Full-scale WWTP Calibration Influent characterization Modelling 

Abbreviations

A2/O

Anaerobic, anoxic and aerobic (WWTP configuration)

ASM

Activated sludge models

BOD5

Biological oxygen demand (5 days)

CCF

Calibration cost function

COD

Chemical oxygen demand

DO

Dissolved oxygen

EBPR

Enhanced biological phosphorus removal

FIM

Fisher information matrix

GAO

Glycogen accumulating organisms

IWA

International Water Association

PAO

Phosphorus accumulating organisms

PCCF

Preliminary calibration cost function

PID

Proportional-integral-derivative controller

RDE

Ratio of normalized D to modified E criteria from FIM

SRT

Sludge retention time

TKN

Total Kjeldahl nitrogen

TN

Total nitrogen

TSS

Total suspended solids

VCF

Validation cost function

WWTP

Wastewater treatment plant

WERF

Water Environment Research Foundation

Notes

Acknowledgments

The authors greatly acknowledge to Ricard Tomas and Ana Lupón (Aigües de Manresa S.A.) all the support provided in conducting this work. Vinicius Cunha Machado has received a Pre-doctoral scholarship of the AGAUR (Agència de Gestió d’Ajuts Universitaris i Recerca, Catalonia, Spain), inside programs of the European Community Social Fund. This work was supported by the Spanish Ministerio de Economía y Competitividad (CTM2010-20384). The authors are members of the GENOCOV research group (Grup de Recerca Consolidat de la Generalitat de Catalunya, 2009 SGR 815).

Supplementary material

449_2013_1099_MOESM1_ESM.doc (166 kb)
Supplementary material 1 (DOC 167 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Vinicius Cunha Machado
    • 1
  • Javier Lafuente
    • 1
  • Juan Antonio Baeza
    • 1
  1. 1.Department of Chemical Engineering, Escola d’EnginyeriaUniversitat Autònoma de BarcelonaBellaterra (Barcelona)Spain

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