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Eckert, D.* ; Kürzinger, P. ; Bauer, R.D. ; Griebler, C. ; Cirpka, O.A.*

Fringe-controlled biodegradation under dynamic conditions: Quasi 2-D flow-through experiments and reactive-transport modeling.

J. Contam. Hydrol. 172, 100-111 (2015)

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Open Access Green as soon as Postprint is submitted to ZB.

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Biodegradation in contaminated aquifers has been shown to be most pronounced at the fringe of contaminant plumes, where mixing of contaminated water and ambient groundwater, containing dissolved electron acceptors, stimulates microbial activity. While physical mixing of contaminant and electron acceptor by transverse dispersion has been shown to be the major bottleneck for biodegradation in steady-state plumes, so far little is known on the effect of flow and transport dynamics (caused, e.g., by a seasonally fluctuating groundwater table) on biodegradation in these systems. Towards this end we performed experiments in quasi-two-dimensional flow-through microcosms on aerobic toluene degradation by Pseudomonas putida F1. Plume dynamics were simulated by vertical alteration of the toluene plume position and experimental results were analyzed by reactive-transport modeling. We found that, even after disappearance of the toluene plume for two weeks, the majority of microorganisms stayed attached to the sediment and regained their full biodegradation potential within two days after reappearance of the toluene plume. Our results underline that besides microbial growth, also maintenance and dormancy are important processes that affect biodegradation performance under transient environmental conditions and therefore deserve increased consideration in future reactive-transport modeling.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Dormancy ; Endogeneous Respiration ; Fringe-controlled Biodegradation ; Microbial Dynamics ; Reactive-transport Modeling; Transverse Dispersion; Natural Attenuation; Transient Flow; Porous-media; Bacteria; Plume; Dormancy; Degradation; Sediment; Aquifer

ISSN (print) / ISBN 0169-7722

e-ISSN 1873-6009

Journal Journal of Contaminant Hydrology

Quellenangaben Volume: 172, Pages: 100-111

Publisher Elsevier

Publishing Place Amsterdam

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Groundwater Ecology (IGOE)