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Article

Steady-State Methodology for Activated Sludge Model 1 (ASM1) State Variable Calculation in MBR

1
Process and Chemical Engineering Department, Gabes National Engineering School, Gabes University, Gabes 6029, Tunisia
2
Institut Européen des Membranes (IEM), Univ Montpellier, 34090 Montpellier, France
*
Author to whom correspondence should be addressed.
Water 2020, 12(11), 3220; https://doi.org/10.3390/w12113220
Received: 9 October 2020 / Revised: 1 November 2020 / Accepted: 11 November 2020 / Published: 17 November 2020
(This article belongs to the Special Issue Modelling Approach to Wastewater Membrane Filtration Processes)
The complexity of Activated Sludge Model No. 1 (ASM1) is one of the main obstacles slowing its widespread use, particularly among wastewater treatment plant (WWTP) professionals. In this paper, a simplification procedure based on steady-state mass balances is proposed for the conventional activated sludge process (ASP) configuration, consisting of an aerated bioreactor and a perfect settler (without particular compounds in the outlet). The results do, in fact, show perfect suitability to a membrane bioreactor process (MBR). Both organic carbon and nitrogen removal were investigated. The proposed approach was applied to ASM1, and simple analytical expressions of the state variables were obtained. These analytical expressions were then validated by comparison to simulations given by the original ASM1 (implemented in GPS-X software). A strong match (less than 4% of error overall) was obtained between both results in the steady-state; consequently, these analytical expressions may be useful as tools for quickly estimating the main state variables, feeding the filtration models, or identifying the interaction between operating parameters. Moreover, this enables a sensitivity analysis, covering relevant factors such as kinetics or operating parameters. For instance, the sludge retention time (SRT) effect is lower on XBH and XS at high SRT (˃20 days), while it is more pronounced on XP and XI as their variations with SRT are linear. View Full-Text
Keywords: biological wastewater treatment; activated sludge model; steady-state modeling; sensitivity analysis biological wastewater treatment; activated sludge model; steady-state modeling; sensitivity analysis
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MDPI and ACS Style

Lahdhiri, A.; Lesage, G.; Hannachi, A.; Heran, M. Steady-State Methodology for Activated Sludge Model 1 (ASM1) State Variable Calculation in MBR. Water 2020, 12, 3220. https://doi.org/10.3390/w12113220

AMA Style

Lahdhiri A, Lesage G, Hannachi A, Heran M. Steady-State Methodology for Activated Sludge Model 1 (ASM1) State Variable Calculation in MBR. Water. 2020; 12(11):3220. https://doi.org/10.3390/w12113220

Chicago/Turabian Style

Lahdhiri, Ameni; Lesage, Geoffroy; Hannachi, Ahmed; Heran, Marc. 2020. "Steady-State Methodology for Activated Sludge Model 1 (ASM1) State Variable Calculation in MBR" Water 12, no. 11: 3220. https://doi.org/10.3390/w12113220

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