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Gas flares contribution in total health risk assessment of BTEX in Asalouyeh, Iran
Process Safety and Environmental Protection ( IF 7.8 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.psep.2020.02.034
Mohammad Amin Mirrezaei , Ali Ahmadi Orkomi

Abstract The health risk assessment of benzene, toluene, ethylbenzene and xylenes (BTEX) associated with the combustion of gas in gas flares of one of the largest gas refinery complex in Iran (South Pars gas complex in Asalouyeh, 1–10 phases) has been conducted based on Office of Environmental Health Hazard Assessment’s (OEHHA) method. In this regard, AERMOD dispersion model coupled with WRF model has been used to predict the ground level concentration of pollutants emitted from gas flares. The accuracy of the dispersion model has been verified with measured ambient SO2 data. The risk assessment results have shown that the chronic noncarcinogenic risk of BTEX emitted from gas flares is in the acceptable range in the residential area and most of refineries site. Regarding acute noncarcinogenic risk, the hazard indices (HIs) are only greater than one in refineries sites and are less than permitted level elsewhere in the study area. For carcinogenic risk, the cumulative risk of benzene and ethylbenzene are greater than 10−6 in refineries sites and two cities (Asalouyeh and Nakhl Taghi), but in two camps nearby the gas flaring sites, the value is less than the allowable limit. Besides, the relative contribution of gas flaring in health risk assessment of BTEX is accomplished by calculating the health risk parameters with the measured BTEX concentrations at 10 receptors, which reveal the cumulative effects of all potential sources of BTEX throughout the study area. The comparison of health risk parameters has shown that the health risk of BTEX associated with flaring is in average 42 %, 2.6 % and 10.8 % of the overall health risk of BTEX in industrial areas, two cities and camps, respectively. It can be concluded that the contribution of gas flaring in industrial areas is noticeable and application of emission reduction policies at gas flaring, has a major effect on industrial areas and maybe has minor effects on the air quality of the residential areas.

中文翻译:

伊朗 Asalouyeh 的气体燃烧对 BTEX 总体健康风险评估的贡献

摘要 伊朗最大的天然气炼油厂之一(Asalouyeh 的 South Pars 天然气厂,1-10 阶段)的气体燃烧中与气体燃烧相关的苯、甲苯、乙苯和二甲苯 (BTEX) 的健康风险评估已经完成。根据环境健康危害评估办公室 (OEHHA) 的方法进行。在这方面,AERMOD 扩散模型与 WRF 模型相结合已被用于预测气体火炬排放污染物的地面浓度。扩散模型的准确性已经通过测量的环境 SO2 数据进行了验证。风险评估结果表明,在居民区和大部分炼油厂现场,天然气火炬排放的 BTEX 慢性非致癌风险在可接受范围内。关于急性非致癌风险,炼油厂现场的危害指数 (HI) 仅大于 1,而低于研究区域其他地方的允许水平。在致癌风险方面,炼厂厂址和两个城市(Asalouyeh 和 Nakhl Taghi)苯和乙苯的累积风险大于 10−6,但在天然气燃烧场附近的两个营地,该值低于允许限值。此外,气体燃烧在 BTEX 健康风险评估中的相对贡献是通过使用 10 个受体处测得的 BTEX 浓度计算健康风险参数来完成的,这揭示了整个研究区域所有潜在 BTEX 来源的累积效应。健康风险参数的比较表明,与燃烧相关的 BTEX 的健康风险平均为 42%、2.6% 和 10。工业区、两个城市和营地分别占 BTEX 总体健康风险的 8%。可以得出结论,工业区燃气燃烧的贡献显着,燃气燃烧减排政策的应用,对工业区的影响较大,对居民区空气质量的影响可能较小。
更新日期:2020-05-01
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