globalchange  > 气候变化事实与影响
DOI: 10.1016/j.watres.2018.12.051
Scopus记录号: 2-s2.0-85061635723
论文题名:
Biomass segregation between biofilm and flocs improves the control of nitrite-oxidizing bacteria in mainstream partial nitritation and anammox processes
作者: Laureni M.; Weissbrodt D.G.; Villez K.; Robin O.; de Jonge N.; Rosenthal A.; Wells G.; Nielsen J.L.; Morgenroth E.; Joss A.
刊名: Water Research
ISSN: 431354
出版年: 2019
卷: 154
起始页码: 104
结束页码: 116
语种: 英语
英文关键词: Biomass segregation ; Hybrid system ; IFAS ; Mainstream anammox ; Mathematical modelling ; Nitrite sink ; NOB washout ; Partial nitritation/anammox
英文摘要: The control of nitrite-oxidizing bacteria (NOB) challenges the implementation of partial nitritation and anammox (PN/A) processes under mainstream conditions. The aim of the present study was to understand how operating conditions impact microbial competition and the control of NOB in hybrid PN/A systems, where biofilm and flocs coexist. A hybrid PN/A moving-bed biofilm reactor (MBBR; also referred to as integrated fixed film activated sludge or IFAS) was operated at 15 °C on aerobically pre-treated municipal wastewater (23 mg NH4-N L −1 ). Ammonium-oxidizing bacteria (AOB) and NOB were enriched primarily in the flocs, and anammox bacteria (AMX) in the biofilm. After decreasing the dissolved oxygen concentration (DO) from 1.2 to 0.17 mg O2 L −1 - with all other operating conditions unchanged - washout of NOB from the flocs was observed. The activity of the minor NOB fraction remaining in the biofilm was suppressed at low DO. As a result, low effluent NO 3 − concentrations (0.5 mg N L −1 ) were consistently achieved at aerobic nitrogen removal rates (80 mg N L −1 d −1 ) comparable to those of conventional treatment plants. A simple dynamic mathematical model, assuming perfect biomass segregation with AOB and NOB in the flocs and AMX in the biofilm, was able to qualitatively reproduce the selective washout of NOB from the flocs in response to the decrease in DO-setpoint. Similarly, numerical simulations indicated that flocs removal is an effective operational strategy to achieve the selective washout of NOB. The direct competition for NO 2 − between NOB and AMX - the latter retained in the biofilm and acting as a “NO 2 -sink” - was identified by the model as key mechanism leading to a difference in the actual growth rates of AOB and NOB (i.e., μ NOB < μ AOB in flocs) and allowing for the selective NOB washout over a broad range of simulated sludge retention times (SRT = 6.8–24.5 d). Experimental results and model predictions demonstrate the increased operational flexibility, in terms of variables that can be easily controlled by operators, offered by hybrid systems as compared to solely biofilm systems for the control of NOB in mainstream PN/A applications. © 2019 The Author(s)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121953
Appears in Collections:气候变化事实与影响

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作者单位: Eawag: Swiss Federal Institute of Aquatic Science and Technology, Überlandstrasse 133, Dübendorf, 8600, Switzerland; Institute of Environmental Engineering, ETH Zürich, Stefano-Franscini-Platz 5, Zürich, CH-8093, Switzerland; Department of Biotechnology, Delft University of Technology, Van der Maasweg 9, HZ Delft, NL- 2629, Netherlands; Department of Chemistry and Bioscience, Aalborg University, Fredrik Bajers Vej 7H, Aalborg, DK-9220, Denmark; Northwestern University, Department of Civil and Environmental Engineering, Evanston, IL, United States

Recommended Citation:
Laureni M.,Weissbrodt D.G.,Villez K.,et al. Biomass segregation between biofilm and flocs improves the control of nitrite-oxidizing bacteria in mainstream partial nitritation and anammox processes[J]. Water Research,2019-01-01,154
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