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Cutting down on the ozone and SOA formation as well as health risks of VOCs emitted from e-waste dismantlement by integration technique
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2018-07-20 , DOI: 10.1016/j.jenvman.2018.07.034
Ranran Liu , Jiangyao Chen , Guiying Li , Xinming Wang , Taicheng An

Elimination of volatile organic compounds (VOCs) in the e-waste dismantling industry by an integration technique of spray tower-electrostatic precipitation-photocatalysis was conducted to investigate its application possibility for reducing formation of O3 and secondary organic aerosols (SOAs) as well as exposure risk. Results revealed the average 5.4 × 102 μg m−3 of VOCs with the top two groups being aromatic hydrocarbons (AHs, 55.93%) and halogenated hydrocarbons (HHs, 33.33%), contributing to 1.3 × 103 and 3.0 × 104 μg m−3 of the O3 and SOA (OFP and SOAFP) formation potential, respectively. Furthermore, 86.47% of OFP and 99.87% of SOAFP were ascribed to AHs, in which toluene ranked first (35.30% and 48.07%). The highest removal efficiency (76.92%) for VOCs by the integrated technique resulted in excellent prevention efficiencies of OFP (71.54%) and SOAFP (80.62%). Occupational cancer risk assessment found that HHs (62.63%) and AHs (36.93%) were the top two contributors. After the treatment by the integrated technique, 55.44% of the total risk index was reduced with the accumulation of few low-concentrated and more toxic AHs (e.g. 6.6 μg m−3 benzene on average). All results suggest that controlling AH and HH emissions from the e-waste dismantling source could efficiently prevent atmospheric secondary pollution and human exposure risk to industrial emission.



中文翻译:

通过集成技术减少臭氧和SOA的形成以及从电子废物拆解中释放出的VOC的健康风险

通过喷雾塔-静电沉淀-光催化一体化技术,消除了电子垃圾处理行业中的挥发性有机化合物(VOCs),以研究其在减少O 3和二次有机气溶胶(SOA)形成中的应用可能性。暴露风险。结果显示平均5.4×10 2 微克米-3的VOC与顶部的两个基团芳族烃(AHS,55.93%)和卤代烃(HHS,33.33%),有助于1.3×10 3和3.0×10 4 微克O 3的m -3和SOA(OFP和SOAFP)的形成潜力。此外,AH占86.47%,SOAFP占99.87%,其中甲苯居首位(分别为35.30%和48.07%)。集成技术对VOC的最高去除效率(76.92%)使得OFP(71.54%)和SOAFP(80.62%)的预防效率极高。职业癌症风险评估发现,HH(62.63%)和AH(36.93%)是最重要的两个因素。通过综合技术治疗后,总的风险指数降低了55.44%,同时积累了少量低浓度和毒性更大的AH(例如6.6μgm -3)苯)。所有结果表明,控制电子废物拆解源中的AH和HH排放可以有效防止大气中的二次污染和人类暴露于工业排放的风险。

更新日期:2018-07-20
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