globalchange  > 气候变化事实与影响
DOI: 10.1016/j.watres.2018.10.084
Scopus ID: 2-s2.0-85056461045
Predation creates unique void layer in membrane-aerated biofilms
Author: Aybar M.; Perez-Calleja P.; Li M.; Pavissich J.P.; Nerenberg R.
Source Publication: Water Research
ISSN: 431354
Publishing Year: 2019
pages begin: 232
pages end: 242
Language: 英语
Keyword: Biofilm ; MABR ; Porosity ; Predation ; Protozoa ; Voids
Scopus Keyword: Aerobic bacteria ; Biofilms ; Diffusion ; DNA sequences ; Gene encoding ; Nitrification ; Optical tomography ; Porosity ; Protozoa ; Wastewater treatment ; Aerobic microorganisms ; MABR ; Membrane aerated biofilm reactors (MABR) ; Microbial growth rate ; Predation ; Substrate concentrations ; Voids ; Wastewater treatment technologies ; Void fraction ; aeration ; biofilm ; bioreactor ; biotechnology ; DNA ; membrane ; microbial ecology ; numerical model ; porosity ; predation ; protist ; protozoan ; relative abundance ; wastewater treatment ; amoeba (life cycle stage) ; Article ; bacterial growth ; Betaproteobacteria ; chemical oxygen demand ; controlled study ; Dechloromonas ; diffusion ; diffusivity ; DNA sequence ; Flavobacterium ; mathematical model ; nonhuman ; optical coherence tomography ; population abundance ; porosity ; predation ; priority journal ; protozoon ; substrate concentration ; Zoogloea ; Bacteria (microorganisms) ; Mastigophora (flagellates) ; Protozoa
English Abstract: The membrane-aerated biofilm reactor (MABR) is a novel wastewater treatment technology based on oxygen-supplying membranes. The counter diffusion of oxygen and electron donors in MABRs leads to unique behavior, and we hypothesized it also could impact predation. We used optical coherence tomography (OCT), microsensor analyses, and mathematical modeling to investigate predation in membrane-aerated biofilms (MABs). When protozoa were excluded from the inoculum, the MAB's OCT-observable void fraction was around 5%. When protozoa were included, the void fraction grew to nearly 50%, with large, continuous voids at the base of the biofilm. Real-time OCT imaging showed highly motile protozoa in the voids. MABs with protozoa and a high bulk COD (270 mg/L) only had 4% void fraction. DNA sequencing revealed a high relative abundance of amoeba in both high and low-COD MABs. Flagellates were only abundant in the low-COD MAB. Modeling also suggested a relationship between substrate concentrations, diffusion mode (co- or counter-diffusion), and biofilm void fraction. Results suggest that amoeba proliferate in the biofilm interior, especially in the aerobic zones. Voids form once COD limitation at the base of MABs allows predation rates to exceed microbial growth rates. Once formed, the voids provide a niche for motile protozoa, which expand the voids into a large, continuous gap. This increases the potential for biofilm sloughing, and may have detrimental effects on slow-growing, aerobic microorganisms such as nitrifying bacteria. © 2018 Elsevier Ltd
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被引频次[WOS]:5   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Appears in Collections:气候变化事实与影响

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Affiliation: Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556, United States; Department of Civil Engineering, University of Concepción, Ciudad Universitaria, Casilla 160-C, Concepción, Chile; Laboratorio de Bioingeniería, Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Santiago, Chile; Center of Applied Ecology and Sustainability (CAPES-UC), Santiago, Chile

Recommended Citation:
Aybar M.,Perez-Calleja P.,Li M.,et al. Predation creates unique void layer in membrane-aerated biofilms[J]. Water Research,2019-01-01
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