Serveur d'exploration sur les relations entre la France et l'Australie

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BTEX vapour biodegradation rates in the vadose zone : initial estimates

Identifieur interne : 00CC89 ( Main/Exploration ); précédent : 00CC88; suivant : 00CC90

BTEX vapour biodegradation rates in the vadose zone : initial estimates

Auteurs : G. B. Davis [Australie] ; T. R. Power [Australie] ; D. Briegel [Australie] ; B. M. Patterson [Australie]

Source :

RBID : Pascal:99-0024334

Descripteurs français

English descriptors

Abstract

Field investigations provided in situ estimates of biodegradation rates of BTEX (benzene, toluene, ethylbenzene, xylene) vapours in a gasoline-contaminated vadose zone. The soil was predominantly a leached, low-organic carbon content sand with variably cemented layers and a water table about 3.0 m below ground. Soil gas profiles indicated that oxygen consumption, carbon dioxide production and hydrocarbon vapour biodegradation occurred in a thin, shallow zone of the soil profile, typically within the top 0.8 m of the soil profile. Modelling of static oxygen concentration depth-profiles gave average oxygen consumption rates of 28-43% day-1. These gave average hydrocarbon vapour biodegradation rates of 110-17 mg-hexane l-1 day-1.


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Le document en format XML

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<term>Biodegradation</term>
<term>Ethylbenzene</term>
<term>Gasoline</term>
<term>Ground water</term>
<term>Organic compounds</term>
<term>Selfpurification</term>
<term>Soil pollution</term>
<term>Toluene</term>
<term>Vapor</term>
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<term>Benzène</term>
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<term>Vapeur</term>
<term>Dégradation biologique</term>
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<front>
<div type="abstract" xml:lang="en">Field investigations provided in situ estimates of biodegradation rates of BTEX (benzene, toluene, ethylbenzene, xylene) vapours in a gasoline-contaminated vadose zone. The soil was predominantly a leached, low-organic carbon content sand with variably cemented layers and a water table about 3.0 m below ground. Soil gas profiles indicated that oxygen consumption, carbon dioxide production and hydrocarbon vapour biodegradation occurred in a thin, shallow zone of the soil profile, typically within the top 0.8 m of the soil profile. Modelling of static oxygen concentration depth-profiles gave average oxygen consumption rates of 28-43% day
<sup>-1</sup>
. These gave average hydrocarbon vapour biodegradation rates of 110-17 mg-hexane l
<sup>-1</sup>
day
<sup>-1</sup>
.</div>
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