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2014, Volume 8, Issue 2

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Frontiers of Environmental Science & Engineering >> 2014, Volume 8, Issue 2 doi: 10.1007/s11783-013-0561-9

Bioremediation of highly contaminated oilfield soil: Bioaugmentation for enhancing aromatic compounds removal

1. College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China; 2. College of Chemistry and Environmental Engineering, Shanxi Datong University, Datong 037009, China; 3. Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Tianjin 300071, China; 4. Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin 300071, China

Available online: 2014-04-01
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Abstract

This study evaluated the effectiveness of different amendments—including a commercial NPK fertilizer, a humic substance (HS), an organic industrial waste (NovoGro), and a yeast-bacteria consortium—in the remediation of highly contaminated (up to 6% of total petroleum hydrocarbons) oilfield soils. The concentrations of hydrocarbon, soil toxicity, physicochemical properties of the soil, microbial population numbers, enzyme activities and microbial community structures were examined during the 90-d incubation. The results showed that the greatest degradation of total petroleum hydrocarbons (TPH) was observed with the biostimulation using mixture of NPK, HS and NovoGro, a treatment scheme that enhanced both dehydrogenase and lipase activities in soil. Introduction of exogenous hydrocarbon-degrading bacteria (in addition to biostimulation with NPK, HS and NovoGro) had negligible effect on the removal of TPH, which was likely due to the competition between exogenous and autochthonous microorganisms. Nonetheless, the addition of exogenous yeast-bacteria consortium significantly enhanced the removal of the aromatic fraction of the petroleum hydrocarbons, thus detoxifying the soil. The effect of bioaugmentation on the removal of more recalcitrant petroleum hydrocarbon fraction was likely due to the synergistic effect of bacteria and fungi.

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