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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)
DOI PMC
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
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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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Korrespondenzautor
Schlagwörter 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
Zeitschrift Journal of Contaminant Hydrology
Quellenangaben Band: 172, Heft: , Seiten: 100-111 Artikelnummer: , Supplement: ,
Verlag Elsevier
Verlagsort Amsterdam
Nichtpatentliteratur Publikationen
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Groundwater Ecology (IGOE)