Through batch-enrichments from contaminated sea-bed mud in Bohai sea we have isolated and characterized two bacterial strains named T7-2 and T7-7 that can better use hydrocarbons as a source of carbon and energy at 15°C than others. The mixed bacteria was used to degraded diesel oilGudao light crude oil from Shengli Oilfield and Guan 69-8 heavy crude oil from Dagang Oilfield then the degradation rates were 81.11%, 97.05% and 61.08%.
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