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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Enhanced biodegradation by hydraulic heterogeneities in petroleum hydrocarbon plumes.
J. Contam. Hydrol. 105, 56-68 (2009)
In case of dissolved electron donors and acceptors, natural attenuation of organic contaminant plumes in aquifers is governed by hydrodynamic mixing and microbial activity. Main objectives of this work were (i) to determine whether aerobic and anaerobic biodegradation in porous sediments is controlled by transverse dispersion, (ii) to elucidate the effect of sediment heterogeneity on mixing and biodegradation, and (iii) to search for degradation-limiting factors. Comparative experiments were conducted in two-dimensional sediment microcosms. Aerobic toluene and later ethylbenzene degradation by Pseudomonas putida strain F1 was initially followed in a plume developing from oxic to anoxic conditions and later under steady-state mixing-controlled conditions. Competitive anaerobic degradation was then initiated by introduction of the denitrifying strain Aromatoleum aromaticum EbN1. In homogeneous sand, aerobic toluene degradation was clearly controlled by dispersive mixing. Similarly, under denitrifying conditions, microbial activity was located at the plume's fringes. Sediment heterogeneity caused flow focusing and improved the mixing of reactants. Independent from the electron accepting process, net biodegradation was always higher in the heterogeneous setting with a calculated efficiency plus of 23-100% as compared to the homogeneous setup. Flow and reactive transport model simulations were performed in order to interpret and evaluate the experimental results.
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Schlagwörter
Biodegradation; Contaminant plume; Natural attenuation; Sediment heterogeneity; Toluene oxidation; Transverse dispersion; electron-accepting processes; saturated porous-media; contaminated aquifer; aromatic-hydrocarbons; natural attenuation; reactive transport; bacterial-growth; steady-state; groundwater; model
ISSN (print) / ISBN
0169-7722
e-ISSN
1873-6009
Zeitschrift
Journal of Contaminant Hydrology
Quellenangaben
Band: 105,
Heft: 1-2,
Seiten: 56-68
Verlag
Elsevier
Nichtpatentliteratur
Publikationen
Begutachtungsstatus
Peer reviewed
Institut(e)
Institute of Groundwater Ecology (IGOE)