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走航溯源耦合在线监测分析喷涂企业排放VOCs对大气臭氧污染的影响
Analysis of the Impact of VOCs Emission from Coating Industry on Atmospheric Ozone Pollution by On-line Monitoring Coupled with Aviation Traceability
投稿时间:2021-06-12  修订日期:2021-09-03
DOI:10.19316/j.issn.1002-6002.2021.06.07
中文关键词:  挥发性有机物  污染特征  臭氧  生成机制  走航溯源
英文关键词:VOCs  pollution characteristics  ozone  generation mechanism  tracing source
基金项目:济南市政府大气来源解析采购项目(402015202000024-001)
作者单位
闫怀忠 山东省济南生态环境监测中心, 山东 济南 250101 
赵继峰 山东建筑大学市政与环境工程学院, 山东 济南 250101
山东省环境保护科学研究设计院有限公司, 山东 济南 250013 
潘光 山东省生态环境监测中心, 山东 济南 250101 
徐标 山东省生态环境监测中心, 山东 济南 250101 
谷树茂 山东省生态环境监测中心, 山东 济南 250101 
孙友敏 山东建筑大学市政与环境工程学院, 山东 济南 250101 
张桂芹* 山东建筑大学市政与环境工程学院, 山东 济南 250101 
通讯作者:张桂芹*  山东建筑大学市政与环境工程学院, 山东 济南 250101  
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中文摘要:
      选择某喷涂企业附近环境空气为采样点位,在3个监测时段(5、9、11月)基于成分监测车在线监测107种挥发性有机物(VOCs),分析环境空气中VOCs污染特征和成分,结合走航监测车进行溯源分析,利用MCM模式结合敏感性实验研究了臭氧生成机制。结果表明:5月A时段的VOCs总浓度(247.43 μg/m3)高于其他2个监测时段(134.29、107.07 μg/m3),体现了VOCs季节性的变化趋势;3个监测时段VOCs浓度均以含氧有机物为主,其占比分别为44.36%、55.30%和37.90%,其次为芳香烃和烷烃,但不同监测时段同类VOCs占比各不相同,体现了不同季节VOCs浓度的差异性。3个监测时段均排在浓度排名前10位的物种有6种,分别为乙醇、丙酮、对/间二甲苯、苯、二氯甲烷和甲苯,说明该监测点位存在稳定污染排放源。走航溯源监测获得空气点位及附近喷涂企业内VOCs浓度和成分特征,结果显示环境大气中的VOCs主要组分来自喷涂企业厂区使用的挥发性溶剂的排放和油性漆的挥发排放。研究臭氧生成潜势(OFP)可知,芳香烃的OFP值在3个监测时段占比最高,对臭氧生成贡献较高的物种主要有对/间二甲苯、甲苯等芳香烃,乙醇和甲基丙烯酸甲酯等含氧有机物,异戊二烯和丙烯等烯烃类物种。MCM模式结果显示:5月A时段监测期间的臭氧光化学生成速率大于9月B时段和11月C时段,O3生成过程主要受甲基过氧自由基(CH3O2)+NO 和过氧化羟基自由基(HO2)+NO 控制。相对增量反应敏感性实验结果显示:3个监测时段臭氧生成均处于VOCs控制区,5月A时段,控制异戊二烯、芳香烃类物种可以大幅减少臭氧的生成,9月B时段需主要控制芳香烃和含氧有机物的排放,11月C时段则需控制芳香烃物种的排放。就VOCs单体而言,3个监测时段减少对/间二甲苯的浓度,对臭氧生成影响较大。走航溯源耦合在线监测方法可以实现臭氧污染快速原位溯源。
英文摘要:
      A coating industry was selected to monitor 107 volatile organic compounds (VOCS) in ambient air with an on-line monitoring vehicle.Three monitoring periods were May,September 2019 and November 2020.The characteristics and composition of VOCS in ambient air were analyzed.The aviation monitoring vehicle carried out traceability analysis of VOCs emission sources.Using the Master chemical mechanism (MCM) model combined with sensitivity experiments,the generation mechanism of ozone was researched.The results showed that the total concentration of VOCs in A monitoring period in May with the value of 247.43 μg/m3 was higher than the value (134.29 μg/m3 and 107.07 μg/m3,respectively) in other two monitoring periods.This indicated the seasonal trends of VOCs.The oxygen-containing organics concentrations were highest in the three monitoring periods and the percentages of VOCs were 44.36%,55.30% and 37.90% respectively.Aromatic hydrocarbons and alkanes followed.However,the percentages of VOCs of the same kind were different in three monitoring periods,indicating that the VOCs concentrations had seasonal difference.There were 6 same species in the top ten species in concentration in the three monitoring periods which were ethanol,acetone,p-xylene,benzene,dichloromethane and toluene,indicat that there were stable emission sources.According to the traceability monitoring of VOCs concentration and composition characteristics,it can be seen that the main components of VOCs in the atmosphere were affected by the emission of volatile solvents and the volatilization of oil paint used in the coating industry’s plant area.In addition,the exhaust emissions of motor vehicles at the intersection of the main road also had a certain impact on the atmosphere VOCs.Ozone generation potential (OFP) research showed that the OFP value of aromatic hydrocarbons accounted for the highest proportion in the three monitoring periods.The species that contribute high to ozone generation were mainly para-m-xylene,toluene and other aromatic hydrocarbons,ethanol and methyl methacrylate oxygen-containing organics,isoprene and propylene and other olefinic species.The results of the MCM model showed that the photochemical generation rate of ozone of A monitoring period in May was bigger than that of B monitoring period in September and C monitoring period in November.The ozone generation was mainly affected by two reactions methylperoxy radical (CH3O2)+ NO and peroxide.Hydroxyl radical (HO2) + NO control.The results of the sensitivity experiment of relative incremental reactivity showed that the ozone generation in the three monitoring periods was under the VOCs concentration controlling.In A monitoring period in May,controlling isoprene and aromatic hydrocarbon species can greatly reduce the generation of ozone.In B monitoring period in September,it was necessary to mainly control aromatic hydrocarbons and oxygen-containing organics.In C monitoring period in November,it should be controlled the emission of aromatic hydrocarbon species.For the VOCs monomer,reducing the concentration of meta-xylene during the three monitoring periods had the greatest impact on the production and emission reduction rate of ozone.Therefore,the on-line monitoring coupled with navigation traceability method can rapidly realize the in-situ traceability of ozone pollution.
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