水中聚乙烯微塑料风化行为对混凝过程的影响徐铭遥，彭少茵，齐飞，李晨，王振北*，郭明宇北京林业大学环境科学与工程学院摘要以地表水中丰度较高的聚乙烯（PE）微塑料作为研究对象，开展吸附和混凝试验，在解析PE微塑料对水中有机物吸附能力的基础上，用氙灯对PE微塑料进行光老化以模拟微塑料在自然条件下的风化行为，深入研究PE微塑料风化行为对混凝过程的影响。结果表明：粒度为50～200目的PE微塑料对有机物的吸附量为310～350mg/g（以碳计），不存在显著的吸附性能差异。在混凝过程中，相较于未添加PE微塑料的情况，添加未风化的PE微塑料会降低有机物去除率，而添加风化PE微塑料则能明显提升有机物去除率。同时，混凝过程对风化PE微塑料的去除率高于未风化PE微塑料，表明PE微塑料的风化行为有利于其在混凝过程中被去除。根据混凝过程中絮体特征可知，PE微塑料的风化行为对形成絮体的尺寸影响极小，但能显著提高絮体的生长速度。关键词聚乙烯微塑料；风化行为；混凝过程；有机物去除；絮体特征中图分类号：X703文章编号：1674-991X（2023）02-0632-07doi：10.12153/j.issn.1674-991X.20220032EffectofweatheringbehaviorofpolyethylenemicroplasticsinwateroncoagulationprocessXUMingyao,PENGShaoyin,QIFei,LIChen,WANGZhenbei*,GUOMingyuCollegeofEnvironmentalScienceandEngineering,BeijingForestryUniversityAbstractPolyethylene(PE)microplasticswithhighabundanceinsurfacewaterwereusedastheresearchobjecttoconductadsorptionandcoagulationexperiments.BasedonthestudyregardingtheorganicmatteradsorptioncapacityofPEmicroplastics,theeffectofweatheringbehaviorofPEmicroplasticsonthecoagulationprocesswasfurtherexploredbyusingphotoagedPEmicroplasticswithxenonlamptosimulateweatheringbehaviorofmicroplasticsundernaturalconditions.TheresultsshowedthatPEmicroplasticswithparticlesize50-200meshcouldadsorb310-350mg/g(calculatedbycarbon)organicmatter,indicatingthatthemicroplasticsizewouldnotsignificantlyinfluencetheadsorptionperformanceofPEmicroplastics.Incoagulation,comparedwithnoPEmicroplasticsconditions,theadditionofunweatheredPEmicroplasticswaspronetodecreasetheorganicmatterremovalrate,whiletheadditionofweatheredPEmicroplasticswasabletoobviouslyincreasetheremovalefficiencyoforg...
