山东地区典型金属罐喷涂企业VOCs排放特征研究

Source profile of VOCs from metal food package coating in Shandong province

了解涂装行业挥发性有机物(VOCs)的排放特征是制定山东地区臭氧(O3)和PM2.5防控策略的重要环节.本研究在山东地区测定了两家典型食品金属包装企业喷涂过程中VOCs的排放组成,企业产品以饮料罐和罐头为主.结果表明:两家企业排放的总VOCs质量浓度水平相当,质量浓度变化范围在50~1500μg/m 3;但两家企业喷涂过程中VOCs的排放组成具有一定的差异,以生产铝罐和马口铁罐为主的企业中的含氧挥发性有机物(OVOCs)含量最多,占比89.71%(质量分数,下同);而生产铝罐的企业芳香烃(56.15%)是首要的排放种类,其次是OVOCs(32.32%).通过分析两家企业内外喷涂工艺的VOCs源成分谱,发现同一企业不同工艺之间有一定差异,多种罐生产企业的内、外喷涂中乙醇占比最高,分别为94.28%、84.46%;单铝罐生产企业的内喷涂2-丁酮(24.33%)是重要组分,外喷涂中甲苯(36.40%)含量较高.

Understanding the characteristics of volatile organic compounds(VOCs)emission from coating industry is important to formulate the prevention and control strategy of ozone(O3)and PM2.5 in Shandong province.In this work,the volatile organic compounds(VOCs)discharged from metal coating process are analyzed for Shandong's two food packaging factories.The results showed that the concentration of VOCs emitted by the two factories were similar,with variations ranged at 50-1500μg/m 3.However,their VOCs compositions were different to some extent.The oxygenated volatile organic compounds(OVOCs)was dominant and accounted for 89.71%of total VOCs discharged by factory manufacturing both aluminum and tinplate cans(Factory 1);while the aromatic hydrocarbon(56.15%)instead of the OVOCs(32.32%)became the main component of total VOCs discharged by factory manufacturing only aluminum cans(Factory 2).The VOCs source profiles were also different between the two factories.Specifically,the ethanol was dominant for both Factory 1's internal(94.28%)and external(84.46%)coating processes,while the 2-butanone(24.33%)and toluene(36.40%)were the most important components for Factory 2's internal and external coating process,respectively.