石化企业典型排放源VOCs排放特征及其环境影响评价OA

To investigate the emission characteristics and environmental impact of volatile organic com-pounds(VOCs),this study monitored 116 VOCs species across six production units,including the catalytic cracking unit,at a petrochemical enterprise in East China.The results indicated that the catalytic reforming unit exhibited the highest concentration of total VOCs(TVOCs)at 1 544.17 μg/m3.Alkanes were the dominant pollutants,contributing 34.5%to 79.8%of the total emissions across all units,with low-carbon alkanes such as ethane and propane showing consistently high concentrations.Furthermore,alkenes and aromatics demonstra-ted the highest contribution to ozone formation,with m/p-xylene,o-xylene,and propylene identified as critical precursors.Aromatics also constituted the largest contributors to secondary organic aerosol(SOA)formation across all units(70.5%～92.3%),among which benzene,toluene,and o-xylene emerged as the key reactive species.Overall,while the enterprise′s current VOCs emission levels are moderate,the treatment of low-carbon alkanes should be further enhanced to reduce general VOCs pollution.Consequently,strict emission controls on specific high-risk substances,notably acrolein,benzene,and o-xylene,must be implemented to effectively mit-igate their environmental impact.