摘要
医疗废物焚烧是二(口恶)英排放的重点源,但缺乏对其系统、全面的研究,为进一步明确其二(口恶)英排放水平和分布特征,获得二(口恶)英排放监控的重要基础数据,以3处医疗废物焚烧炉为研究对象,采用高分辨气相色谱/高分辨质谱联用仪对烟气中二(口恶)英进行测定和分析。结果表明,烟气中二(口恶)英质量浓度均值为2.379 ng/Nm^3,毒性当量浓度均值为0.249 ng/I-TEQ Nm^3,达到国家排放标准;同系物指纹特征分布以PCDFs为主,质量浓度和毒性当量浓度贡献率最大的单体分别为1,2,3,4,6,7,8-HpCDF和2,3,4,7,8-PeCDF;2,3,4,7,8-PeCDF对I-TEQ相关性最好,相关系数R^2达0.959,可作为指示单体;排放因子均值为6.087μg I-TEQ/t,明显高于生活垃圾焚烧炉,需引起更多关注。
Incineration of medical waste that is liable to cause dioxins emission needs to be further studied, and in order to clarify emission level and distribution characteristics of dioxins from medical waste incineration, and to obtain critical data for monitoring of dioxins emissions, experiments were conducted to measure and analyze the flue gas from the three medical waste incinerators using HRGC/HRMS. The study suggests that the mean values of dioxins mass concentration and toxicity equivalent concentration in flue gas are 2.379 ng/Nm^3, 0.249 ng/I-TEQ Nm^3, respectively, both of which comply with the national emission standards; analysis on characteristic distribution of the dioxins homologue fingerprint indicated PCDD/Fs is mainly based on PCDFs; and the major contributor of mass concentration is 1,2,3,4,6,7,8-HpCDF and major contributor of toxicity equivalent concentration 2,3,4,7,8-PeCDF; in addition, 2,3,4,7,8-PeCDF can be used as a monomer indicator with the best correlation to I-TEQ, the correlation coefficient being 0.959. The mean emission factor is 6.087 μg I-TEQ/t, which is remarkably higher than that of municipal waste incinerator. So, much attention has to be paid to dioxins emissions of medical waste incineration.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2017年第8期153-158,共6页
Environmental Science & Technology
基金
广东省高等学校“千百十”人才培养工程项目(粤教[2014]27号)
关键词
医疗废物焚烧
烟气
二噁英
排放特征
medical waste incineration
flue gas
PCDD/Fs
emission characteristic
