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Open AccessArticle

The Influence of COD Fraction Forms and Molecules Size on Hydrolysis Process Developed by Comparative OUR Studies in Activated Sludge Modelling

Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland
Faculty of Environmental Engineering, Kielce University of Technology, Av. Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland
Faculty of Civil and Environmental Engineering, Tongji University, Siping Road 1239, Yangpu District, Shanghai 200092, China
Mass Transfer Group, School of Chemical Engineering, Vellore Institute of Technology, Gorbachev Road, Vellore, Tamil Nadu 632014, India
Department of Soil Science, Swedish University of Agricultural Sciences, Uppsala 750 07, Sweden
Faculty of Fundamentals of Technology, Lublin University of Technology, Nadbystrzycka 38, 20-618 Lublin, Poland
Faculty of Environmental Engineering, Lublin University of Technology, Nadbystrzycka 40B, 20-618 Lublin, Poland
Author to whom correspondence should be addressed.
Academic Editor: Ming-Chung Wu
Molecules 2020, 25(4), 929;
Received: 1 December 2019 / Revised: 10 February 2020 / Accepted: 11 February 2020 / Published: 19 February 2020
(This article belongs to the Special Issue Advanced Materials and Technologies for Wastewater Treatment)
The activated sludge models (ASMs) commonly used by the International Water Association (IWA) task group are based on chemical oxygen demand (COD) fractionations. However, the proper evaluation of COD fractions, which is crucial for modelling and especially oxygen uptake rate (OUR) predictions, is still under debate. The biodegradation of particulate COD is initiated by the hydrolysis process, which is an integral part of an ASM. This concept has remained in use for over 30 years. The aim of this study was to verify an alternative, more complex, modified (Activated Sludge Model No 2d) ASM2d for modelling the OUR variations and novel procedure for the estimation of a particulate COD fraction through the implementation of the GPS-X software (Hydromantis Environmental Software Solutions, Inc., Hamilton, ON, Canada) in advanced computer simulations. In comparison to the original ASM2d, the modified model more accurately predicted the OUR behavior of real settled wastewater (SWW) samples and SWW after coagulation–flocculation (C–F). The mean absolute relative deviations (MARDs) in OUR were 11.3–29.5% and 18.9–45.8% (original ASM2d) vs. 9.7–15.8% and 11.8–30.3% (modified ASM2d) for the SWW and the C–F samples, respectively. Moreover, the impact of the COD fraction forms and molecules size on the hydrolysis process rate was developed by integrated OUR batch tests in activated sludge modelling. View Full-Text
Keywords: COD fractionations; molecules size; hydrolysis; OUR; ASM2d; modelling COD fractionations; molecules size; hydrolysis; OUR; ASM2d; modelling
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Drewnowski, J.; Szeląg, B.; Xie, L.; Lu, X.; Ganesapillai, M.; Deb, C.K.; Szulżyk-Cieplak, J.; Łagód, G. The Influence of COD Fraction Forms and Molecules Size on Hydrolysis Process Developed by Comparative OUR Studies in Activated Sludge Modelling. Molecules 2020, 25, 929.

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