分會

第三十四分會：環(huán)境化學

摘要

Oil spills interact with mineral particles to form oil-particle aggregates (OPAs), which promotes the oil’s natural diffusion and biodegradation. We investigated the effect of bacteria on the formation and vertical migration of OPAs under different concentrations and types of particles, proposed and elucidated an oil-particle-microbe coupling mechanism. The depth of particle penetration into oil droplets (13~17 μm) was more than twice of the non-bacterial group. Oil remained in the water column and deposited to the bottom decreased from 87% to 54%, and increased from 14% to 28% at high/low concentration respectively. Interestingly, the median droplet diameter showed the negative correlation (R2=0.83) and positive correlation (R2=0.60) at high/low concentration respectively with relative penetration depth firstly proposed. We further demonstrated that bacteria increased the penetrating depth by the combination of reducing/increasing the interfacial tension, reducing the oil amount (C17~C38) in the OPAs and increasing the particle width. These effects reduced the droplets size and ultimately changed the vertical migration of OPAs. Finally, we provided a simple assessment of the vertical distribution of OPAs in nearshore environments based on experiment data and suggested that the role of bacteria penetrating into the oil droplets should not be ignored. These findings will broaden the research perspective of marine oil spills migration.

關鍵詞

Oil-Particle Aggregates (OPAs);Depth of Penetration;Oil-Sediment-Microbe Coupling Mechanism;Vertical Migration;Oil Spill

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