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Biological/physical particles interact to degrade marine oil spills

文献类型： 外文期刊

作者： Dong, Ranran 1 ; Zhang, Li 3 ; Wang, Xinping 5 ; Hu, Xin 6 ; Sun, Junqing 1 ; Bao, Mutai 1 ; Li, Haoshuai 1 ;

作者机构： 1.Ocean Univ China, Frontiers Sci Ctr Deep Ocean Multispheres & Earth, Qingdao 266100, Peoples R China

2.Ocean Univ China, Minist Educ, Key Lab Marine Chem Theory & Technol, Qingdao 266100, Peoples R China

3.Fourth Inst Oceanog, Minist Nat Resources, Beihai 536015, Peoples R China

4.Ocean Univ China, Coll Chem & Chem Engn, Qingdao 266100, Peoples R China

5.Minist Nat Resources, North China Sea Ecol Ctr, Qingdao 266033, Peoples R China

6.Chinese Acad Fishery Sci, Beijing 100141, Peoples R China

关键词： Marine oil spills; Marine oil snow; Oil spills biodegradation; Oil-particles aggregates; Vertical migration of oil droplets

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.4； 五年影响因子：8.6 ）

ISSN： 0301-4797

年卷期： 2025 年 383 卷

页码：

收录情况： SCI

摘要： After marine oil spills, suspended physical particles and extracellular polymeric substances (EPS) secreted by bacteria can aggregate with oil to form marine oil snow (MOS), which determines the vertical migration and biodegradation processes of the submerged oil. Here, we investigated the biodegradation of oil spills during the formation of MOS under different average energy dissipation rates (8) and different ratios of particles. Furthermore, we elucidated the biodegradation mechanism of oil spills from a spatiotemporal perspective. The 8 plays a major role (either promoting or inhibiting) in the biodegradation effect of oil spills, and there is a proportional threshold for biological/physical particles, which can regulate the 8 ' s effect on degradation. The oilwater interfacial tension, the encapsulation of oil droplets by particles, hydrogen bonds, and the vertical distribution of oil droplets (suspended or deposited) will also jointly affect the particles threshold on this basis, thereby influencing the biodegradation of oil spills. When the proportion of XG exceeds the threshold (kaolinite: XG = 1:3 at 150 rpm and 1:1 at 200 rpm), the originally promotive role of 8 on n-alkane degradation shifts to inhibition, while its inhibition impact on PAHs biodegradation shifts to enhancement, respectively. Notably, in nearshore and extreme environments (storm or strong wave conditions), particles are more conducive to the degradation of n-alkanes and PAHs, respectively. This study will further broaden the research perspective on the environmental behavior of marine oil spills in the presence of MOS and providing a theoretical basis for predicting the fate of oil spills in nearshore environments.

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