NDLI: Mathematical simulations of nitrogen removal via a partial nitrification-anaerobic ammonium oxidation in a membrane-aerated biofilm reactor

Content Provider	IEEE Xplore Digital Library
Author	Zhao Xudong Zhao Zongsheng Jia Weijing Dai Jing Jiang Jing
Copyright Year	2010
Description	Author affiliation: Department of Municipal and Environmental Engineering, Beijing Jiaotong University, 100044, China (Zhao Xudong; Zhao Zongsheng; Jia Weijing; Dai Jing; Jiang Jing)
Abstract	A multi-population biofilm model for completely autotrophic nitrogen removal was developed and implemented in the simulation software AQUASIM to investigate the stratification and total nitrogen removal characteristics in a membrane-aerated biofilm reactor, which realized the counter-diffusion of the oxygen and substrates. The model considered four microorganisms including AeAOB, AeNOB, AnAOB and HB. Oxygen is supplied through a gas-permeable membrane that support the biofilm, while ammonia $(NH^{+}4)$ is supplied from the bulk liquid. The model was checked with the selected experimental data. The simulation results reveal a clear stratification of microbial activities in biofilm. The flux ratio of oxygen and ammonia (JO2/JNH4) is an important factor affecting the population stratification. When the JO2/JNH4 is less than 0.25, no stratification appears. With JO2/JNH4 increase, the time of stratification onset decrease quickly. When the JO2/JNH4 is equal to 1.5, stratification time reaches the shortest, 154d. When the JO2/JNH4 exceed 1.5, stratification time become successively increasing. Once the biofilm reaches a certain thickness, then the oxygen supply can be decreased, letting the anaerobic ammonia oxidizers growth and formation of anaerobic zone. When the JO2/JNH4 keep constant 1.5, the total nitrogen removal efficiency will increase with the biofilm thickness increase. When the biofilm thickness exceed certain value (about 2.0mm), the total nitrogen removal efficiency will decreased immediately, this is probably because the difficult of diffusion in thicker biofilm. The optimization biofilm thickness for completely autotrophic nitrogen removal in a membrane-aerated biofilm reactor is between 1.5mm and 2.0mm.
Starting Page	2018
Ending Page	2025
File Size	304867
Page Count	8
File Format	PDF
ISBN	9781424477371
e-ISBN	9781424477395
DOI	10.1109/MACE.2010.5536335
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-26
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Partial nitrification Oxygen Anammox Nitrogen Wastewater Inductors Microorganisms Simulation Model Oxidation Biomembranes Mathematical model Stratification Membrane-aerated Electrons Thickness control
Content Type	Text
Resource Type	Article

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