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首页> 外文会议>International thermal treatment technologies(IT3) amp; hazardous waste combustors (HWC) joint conference 2009 >Difficulties Demonstrating Compliance with a Possible 1-hour NAAQS for SO_2
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Difficulties Demonstrating Compliance with a Possible 1-hour NAAQS for SO_2

机译：证明符合SO_2可能的1小时NAAQS的困难

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摘要

Current atmospheric emission and dispersion modeling of thermal treatment sources for demonstrating compliance with air quality regulations is primarily focused on evaluating long-term impacts of criteria and hazardous air pollutants. However, the U.S. EPA, in its review of the National Ambient Air Quality Standards (NAAQS) for SO_2, appears to be developing a 1 -hour SO_2 standard. This new standard would be designed to protect against acute pollutant-induced effects in asthmatics. If such a standard is adopted, it is likely that many thermal treatment and combustion facilities which satisfy the current NAAQS would now longer be in compliance. This might occur, for example, at landfill flares and engines where high levels of hydrogen sulfide (H_2S) are present in the landfill gas, at facilities where recycled oil is combusted, and at cement kilns processing high-sulfur aggregate. The difficulties in demonstrating compliance with the standard will be particularly difficult at sources that have low exhaust heights, and/or that are located close to either their facility property boundary or to locations where members of the public have access. Depending on how the new standard is written, it may only take a few hours of unusually poorly dispersing meteorological conditions in five years of data to lead to an exceedance of the criteria. Demonstrating compliance with a new 1-hour SO_2 standard may require either advanced modeling of the near-field atmospheric dispersion and/or modifying the treatment and combustion facility.
机译：当前用于证明符合空气质量法规的热处理源的大气排放和扩散模型主要集中于评估标准和有害空气污染物的长期影响。但是，美国EPA在对SO_2的国家环境空气质量标准（NAAQS）进行审查时，似乎正在制定1小时的SO_2标准。该新标准旨在防止哮喘患者受到急性污染物诱发的影响。如果采用这样的标准，那么满足当前NAAQS的许多热处理和燃烧设施可能现在将不再符合标准。例如，这可能发生在垃圾填埋场的火炬和引擎中，其中垃圾填埋气中存在高浓度的硫化氢（H_2S），燃烧再生油的设施以及处理高硫骨料的水泥窑。在排气高度低和/或位于其设施财产边界附近或公众可进入的位置的排放源，证明符合标准的困难将尤其困难。根据新标准的编写方式，可能需要花费数小时才能在五年的数据中分散极差的气象条件，从而导致超出标准。要证明符合新的1小时SO_2标准，可能需要对近场大气扩散进行高级建模和/或修改处理和燃烧设施。

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