Biodegradability of 2-ethylhexyl nitrate (2-EHN), a cetane improver of diesel oil

被引:0
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作者
Floriane Solano-Serena
Elodie Nicolau
Grégory Favreau
Yves Jouanneau
Rémy Marchal
机构
[1] Université de Limoges Parc ESTER Technopole,Groupement de Recherche Eau Sol Environnement, EA 1068 Ecole Nationale d’Ingénieurs de Limoges
[2] Institut Français du Pétrole,Département de Biotechnologie
[3] iRTSV CEA,Laboratoire de Chimie et Biologie des Métaux
[4] CNRS,undefined
[5] UMR 5249,undefined
[6] Université Joseph Fourrier,undefined
来源
Biodegradation | 2009年 / 20卷
关键词
2-Ethylhexyl nitrate; Biodegradation; Mineralization; Soil microbial population;
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学科分类号
摘要
The 2-ethyhexyl nitrate (2-EHN) is currently added to diesel oil to improve ignition and boost cetane number. The biodegradability of this widely used chemical needed to be assessed in order to evaluate the environmental impact in case of accidental release. In aerobic liquid cultures, biodegradation of 2-EHN was assessed in biphasic liquid cultures using an inert non-aqueous phase liquid such as 2,2,4,4,6,8,8-heptamethylnonane (HMN) as solvent for the hydrophobic substrate. 2-EHN was found to be biodegradable by microbial communities from refinery wastewater treatment plants, but was recalcitrant to those of urban wastewater treatment facilities. Out of eighteen hydrocarbon-polluted or non-polluted soil samples, six microbial populations were also able to degrade 2-EHN. However, strain isolation from these microbial populations was rather difficult suggesting close cooperation between members of the microbial communities. Specific axenic bacterial strains selected for their ability to catabolize recalcitrant-hydrocarbons were also tested for their capacity to degrade 2-EHN. In liquid cultures with HMN phase as non-aqueous phase liquid, some Mycobacterium austroafricanum strains were found to degrade and mineralize 2–EHN significantly.
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页码:85 / 94
页数:9
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