Extended Activated Sludge Model No.1 with Floc and Biofilm Diffusion for Organic and Nutrient Removal
Publication: Journal of Environmental Engineering
Volume 146, Issue 4
Abstract
This paper presents a modified mathematical model for substrate degradation and nutrient removal by aerobic microorganisms. The modified model is based on Activated Sludge Model No.1 (ASM1) for bacterial growth incorporated with substrate diffusion into flocs and biofilms. Monod kinetics are modified to consider the proton translocation theory for substrate dissociation in ASM1. Microbial growth rate coupled with mass transport rate was studied for heterotrophs and autotrophs in bulk solution and the boundary layer of biofilms to reveal the extra degree of freedom of this dynamic model. Moreover, the sensitivity analysis of the modified model was discussed at steady state using the Newton–Raphson technique. A decrement in the removal efficiency of chemical oxygen demand (COD) and ammonia nitrogen () was obtained under the influence of the diffusion principle compared with modified Monod substrate conversion. However, the decline in biofilm thickness to 50 μm at heterotrophic and autotrophic biomass concentration of and , respectively, enhanced the removal of both influent COD of and influent of in an Integrated Fixed Film Activated Sludge (IFAS) pilot plant experiment established at Zenein wastewater treatment plant (WWTP), Giza, Egypt.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request (MATLAB code and scanning microscopic configuration for biofilm and sludge samples).
Acknowledgments
The authors acknowledge the US—Egypt Science and Technology (S&T) Joint Fund for supplying the IFAS pilot plant at Zenein with funds provided by the United States Agency for International Development (USAID) and the Ministry of Scientific Research (MOSR). The authors also acknowledge the assistance provided by the Nano-microscopic Center of Cairo University, El-Sheikh Zayed City, Giza, Egypt.
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Published In
Journal of Environmental Engineering
Volume 146 • Issue 4 • April 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: May 23, 2019
Accepted: Aug 28, 2019
Published online: Jan 22, 2020
Published in print: Apr 1, 2020
Discussion open until: Jun 22, 2020
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