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The detailed knowledge of the composition of influent going into the wastewater treatment system
is essential for the development of a reliable computer model. In the context of WWTPs,
wastewater characteristics are not only important for activated sludge system modeling, but have
also impact on appropriate control of single unit operations. The aim of this study was to evaluate
concepts of COD fractionation measurement in municipal wastewater by respirometric method in
control and modeling the biological treatment processes at WWTP using the modified Activated
Sludge Model no. 2d (ASM2d) developed by Drewnowski and Makinia (2013). The batch OUR
test results and COD measurements obtained at BNR plant (96,000 m3/d) in Gdansk (Poland),
presented earlier by Drewnowski (2014) and the main BNR WWTP (144,000 m3/d) located in
Malaga (Spain), provided the experimental database for comparison of the wastewater
characteristics and model predictions at both large WWTPs. Some parameters as heterotrophic
growth yield (YH) coefficient required calibration/validation of range (YH = 0.64 and 0.74
gCOD/gCOD for Gdańsk and Malaga WWTP, respectively) to fit the modified ASM2d.
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