Emission of polycyclic aromatic hydrocarbons from medical waste incinerators
Emission of polycyclic aromatic hydrocarbons from medical waste incinerators
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DOI：
10.1016/s1352-2310(01)00533-7
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发表时间：
2002-02-01
影响因子：
5
通讯作者：
Hsieh, LT
中科院分区：
文献类型：
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作者：
Lee, WJ;Liow, MC;Hsieh, LT
本研究针对两台间歇式医疗废物焚烧炉（MWIs）展开，其中一台为机械炉排（MG - MWI），另一台为固定炉排（FG - MWI），分别用于处理普通医疗废物和特殊医疗废物。两台焚烧炉共用相同的串联安装的空气污染控制装置，包括一台静电除尘器（ESP）和一台湿式洗涤器（WSB）。除了对两种类型的医疗废物焚烧炉排放的多环芳烃（PAHs）进行研究外，还包括了空气污染控制装置对多环芳烃的去除效率。在本研究中，采用气相色谱 - 质谱（GC - MS）技术分析了烟囱烟气、ESP飞灰、WSB废水和焚烧灰中21种多环芳烃的浓度。结果表明，烟囱烟气中的总多环芳烃（即21种多环芳烃之和）以低分子量多环芳烃（LM - PAHs，即二至三环多环芳烃）为主，但在两种类型的医疗废物焚烧炉的焚烧灰、ESP飞灰和WSB废水中，发现它们以中分子量多环芳烃（MM - PAHs，即四环多环芳烃）和高分子量多环芳烃（HM - PAHs，即五至七环多环芳烃）为主。上述结果是由于两种类型的医疗废物焚烧炉所使用的空气污染控制装置对中分子量多环芳烃和高分子量多环芳烃的去除效率（>78%）远高于对低分子量多环芳烃的去除效率（<5%）。机械炉排医疗废物焚烧炉的总多环芳烃排放因子（=252,000微克/千克废物）低于固定炉排医疗废物焚烧炉（=856,000微克/千克废物），这可能是由于前者在燃烧过程中的燃烧比后者更完全。然而，上述两个排放因子始终高于位于同一城市的唯一一座城市垃圾焚烧炉（分别为=871微克/千克废物）。上述结果表明未来有必要寻求更好的医疗废物处理技术。（C）2002爱思唯尔科学有限公司。保留所有权利。
This study was conducted on two batch-type medical waste incinerators (MWIs). including the one with a mechanical grate (MG-MWI) and the other with a fixed grate (FG-MWI) for the disposal of general medical waste and special medical waste. respectively. Both incinerators shared the same air-pollution control devices which were installed in series, including one electrostatic precipitator (ESP) and one wet scrubber (WSB). In addition to the investigated emissions of polycyclic aromatic hydrocarbons (PAHs) from both types of MWIs. the PAH removal efficiencies of air-pollution control devices were also included, In this study, the GC, MS technique was used to analyze the concentrations of 21 PAH species contained in the stack flue gas, ESP fly ash, WSB effluent, and incinerating ash. Results show that total-PAHs (i.e.. the sum of 21 PAH species) in stack flue gas were dominated by LM-PAHs (i.e., two- to three-ringed PAHs), but in incinerating ash, ESP fly ash and WSB effluent we found that they were dominated by MM-PAHs (i.e., four-ringed PAHs) and HM-PAHs (i.e., five- to seven-ringed PAHs) for both types of MWIs. The above results due to air-pollution control devices used in both types of MWIs had much higher removal efficiencies oil both MM-PAHs and HM-PAHs (> 78%) than on LM-PAHs (< 5%). The emission factors of total-PAHs for MG-MWI (=252,000 mug/kg-waste) were lower than FG-MWI (=856,000 mug/kg-waste), which was probably Clue to more complete combustion involved in the combustion process of the former than the latter. Nevertheless, the above two emission factors were found consistently higher than the only municipal waste incinerator that was located in the same city (=871 mug/kg-waste, respectively). The above results warrant the need for seeking better technologies f rdisposing medical waste in the future. (C) 2002 Elsevier Science Ltd. All rights reserved.