Modeling of simultaneous anaerobic methane and ammonium oxidation in a membrane biofilm reactor

Chen, Xueming, Guo, Jianhua, Shi, Ying, Hu, Shihu, Yuan, Zhiguo and Ni, Bing-Jie (2014) Modeling of simultaneous anaerobic methane and ammonium oxidation in a membrane biofilm reactor. Environmental Science and Technology, 48 16: 9540-9547. doi:10.1021/es502608s


Author Chen, Xueming
Guo, Jianhua
Shi, Ying
Hu, Shihu
Yuan, Zhiguo
Ni, Bing-Jie
Title Modeling of simultaneous anaerobic methane and ammonium oxidation in a membrane biofilm reactor
Journal name Environmental Science and Technology   Check publisher's open access policy
ISSN 0013-936X
1520-5851
Publication date 2014-08-19
Year available 2014
Sub-type Article (original research)
DOI 10.1021/es502608s
Volume 48
Issue 16
Start page 9540
End page 9547
Total pages 8
Place of publication Washington, DC United States
Publisher American Chemical Society
Language eng
Subject 1600 Chemistry
2304 Environmental Chemistry
Abstract Nitrogen removal by using the synergy of denitrifying anaerobic methane oxidation (DAMO) and anaerobic ammonium oxidation (Anammox) microorganisms in a membrane biofilm reactor (MBfR) has previously been demonstrated experimentally. In this work, a mathematical model is developed to describe the simultaneous anaerobic methane and ammonium oxidation by DAMO and Anammox microorganisms in an MBfR for the first time. In this model, DAMO archaea convert nitrate, both externally fed and/or produced by Anammox, to nitrite, with methane as the electron donor. Anammox and DAMO bacteria jointly remove the nitrite fed/produced, with ammonium and methane as the electron donor, respectively. The model is successfully calibrated and validated using the long-term (over 400 days) dynamic experimental data from the MBfR, as well as two independent batch tests at different operational stages of the MBfR. The model satisfactorily describes the methane oxidation and nitrogen conversion data from the system. Modeling results show the concentration gradients of methane and nitrogen would cause stratification of the biofilm, where Anammox bacteria mainly grow in the biofilm layer close to the bulk liquid and DAMO organisms attach close to the membrane surface. The low surface methane loadings result in a low fraction of DAMO microorganisms, but the high surface methane loadings would lead to overgrowth of DAMO bacteria, which would compete with Anammox for nitrite and decrease the fraction of Anammox bacteria. The results suggest an optimal methane supply under the given condition should be applied not only to benefit the nitrogen removal but also to avoid potential methane emissions.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
Advanced Water Management Centre Publications
 
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