微塑料在紊流中的聚沉行为

打开文本图片集

中图分类号：X522 文献标志码：A 文章编号：1672-2043（2025）07-1836-12

doi：10.11654/jaes.2024-0890

Aggregationand sedimentationbehaviorofmicroplasticsinturbulence

YIN Fuyu'，LI Wang'，ZU Bo1* ，CHEN Wei²，WANG Mei²，ZHANG Zhongjie²， CHEN Xin²，LI Haowen²

（1.College ofRiverandOceanEnginering，ChongqingJiaotongUniversityChongqing40o4，China;2.ChinaMerchantsEco

Environmental Protection Technology Co.，Ltd.， Chongqing 40oo67， China）

Abstract：Thisstudystoivetigateteaggegatioandsdimentationcharacteristicsofmicroplasticsisandcargturbulence andtorevealtheunderlying mechanisms.Byemployingaself-developedisotropicuniform turbulencedeviceand particletracking velocimetry（PT）methd，theaggregationandsedimentationbhaviorofmicroplasticsreanalyzed.Theresultsindicatedtatan increaseinwaterflowsharstrengthouldpromotetheagegationoficroplastics，tecessvelyighsearstregthigtdisuptte structureofagegateslimtingtherfurtherlargementConcurentlyepresnceofdimentinurbulentflowcouldfacilitatete formationoflargericrolasticgregates.Astesearateinreased，thovrallsucturalfractalimensionofparticlesinwater increased，whilefacemoroloicalfactalmesioeasd，ndeesgadalloedditters shearrate.Insand-caryingturbulence，bothtypesoffractaldimensionsofparticleswereslightlyhigherthanthoseinclearwater turbulence.Inclearwaterturbulence，theoverallsetlingvelocityofmicroplasticpartcesfirstincreasedandthndecreasedwith increasingsharateasindangubleeeralleligeoitcreadiiceasinse.df thepresenceofdiment，teminmumstlingveloityofmcroplasticparticlesasdirectlyproportionaltoparticlesizehilete maximumselingelocityasiveseyproporoaltoparticles.Salmicroplasticparticlesebiedpooerslingbiliy turbulenceandweremoresignificantlyectdbyturbulence.Thestudydemonstratesthatturbulencehasadualefectontheaegation ofmicroplasticsandcanalsocausechangesinthestructureandsurfacemorphologyofagregates.Thesedimentationbehaviorof microplasticsisloselyelatedtoparticlesizeandtepreseneofsdimentotonlypromotestheagegationoficroplastisbutalso alters their sedimentationbehavior.

Keywords：microplastics;turbulence; sediment; aggregation; sedimentation

塑料材料因其轻质、耐腐蚀、易于成型、成本低廉和耐用性等特性，在工业、商业、农业和市政等多个领域得到了广泛应用。（剩余21388字）