无组织源VOCs排放及臭氧生成潜势分析

选取汽车喷涂、加油站、垃圾填埋场和化产回收,分析了不同排放源的VOCs污染特征。研究表明:加油站地下储油罐附近VOCs浓度较高,平均为8 637.2μg/m~3,是汽车喷涂VOCs浓度的3.4倍,垃圾填埋场和化产回收的无组织VOCs排放浓度较低,分别为185.5,85.6μg/m~3。汽车喷涂工艺和化产回收车间VOCs排放主要以芳香烃为主,分别占总VOCs的87.6%和82.9%;不同采样时段加油站储油罐VOCs均以烷烃为主,垃圾填埋场VOCs无组织排放主要以芳香烃和烷烃为主。加油站的臭氧生成潜势最大(41 927.2μg/m~3),分别是汽车喷涂、垃圾填埋场和化产回收的3.1,48.8,150.8倍。

EMISSION AND OZONE FORMATION POTENTIAL ANALYSIS OF VOCs EMITTED FROM FUGITIVE SOURCES

The automotive painting,gas station,landfill,and chemical recovery were selected as the sampling sites to analyze the pollution characteristics of VOCs.The results indicated that the VOCs concentration underground storage tanks in gas station was high with the value of 8 637.2 μg/m3,which was 3.4 times higher than that of automotive painting.The VOCs concentration emitted from landfill and chemical recovery were relatively lower,with the value of 185.5,85.6 μg/m3,respectively.VOCs emitted from automotive painting and chemical recovery was mainly composed of aromatic hydrocarbon,accounting for 87.6％ and 82.9％ of the total VOCs mass concentrations,respectively.VOCs emitted from underground storage tanks in gas station was mainly composed of alkane.VOCs emitted from landfill was mainly composed of aromatic hydrocarbon and alkane.The ozone formation potential of gas station was highest with the value of 41 927.2 μg/m3,which was 3.1,48.8,and 150.8 times higher than automotive painting,landfill,and chemical recovery.