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首页> 外文期刊>Building and Environment >Secondary VOCs emission from used fibrous filters in portable air cleaners and ventilation systems
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Secondary VOCs emission from used fibrous filters in portable air cleaners and ventilation systems

机译：便携式空气滤清器和通风系统中使用过的纤维过滤器产生的二次VOC排放

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摘要

Previous research suggests that filters used in indoor portable air cleaners or ventilation systems may be an indoor pollutant source at some point of using when it is loaded with certain amount of particle or gas phase pollutants. To evaluate its influence on indoor air quality, both qualitative and quantitative analysis of the potential source is needed. This study aims at investigating secondary volatile organic compounds (VOCs) emission from used fibrous particle filters. Used filters from portable air cleaners used in real life were collected. HEPA fibrous filters challenged by outdoor dust were investigated to simulate its application in residential fresh air system. Filter samples were stored in room temperature and three different relative humidity settings before testing. The emitted VOCs species and emission rate were measured using a single-pass test system, with TENAX sorbent tubes sampling and GC-MS analysis method. The emitted TVOC concentration profile with time presented a single-peak curve. The data indicated that the TVOC emission rate of used filters were influenced by both dust loading amount and environmental VOCs level. With the same dust loading, TVOC emission rate of filters challenged by indoor dust was 2–10 times higher than filters challenged by outdoor dust. When the environmental VOCs concentration was stable, there is a liner relationship between TVOC emission rate and dust loading. The TVOC emission rate was in the range of 0.63mg/m2-3.46 mg/m2for filters used in portable air cleaners. After exposure in humid environment, the total emitted TVOC generally decreased with the major decrease of Alkanes, Aromatics, Esters and Alcohols categories, while the emission rate of Aldehydes, Ketones and Olefins increased. Possible reason was discussed.
机译：先前的研究表明，当室内便携式空气净化器或通风系统中装有一定量的颗粒或气相污染物时，使用该过滤器可能会成为室内污染源。为了评估其对室内空气质量的影响，需要对潜在来源进行定性和定量分析。这项研究旨在调查二手纤维颗粒过滤器中的次要挥发性有机化合物（VOC）排放。从现实生活中使用的便携式空气滤清器中收集使用过的过滤器。研究了受到室外灰尘挑战的HEPA纤维过滤器，以模拟其在住宅新鲜空气系统中的应用。在测试之前，将过滤器样品存储在室温和三种不同的相对湿度设置下。使用单次通过测试系统测量排放的VOC种类和排放率，并使用TENAX吸附剂管采样和GC-MS分析方法。随时间发出的TVOC浓度曲线呈现单峰曲线。数据表明，使用的过滤器的TVOC排放率受粉尘装载量和环境VOCs水平的影响。在相同的粉尘负荷下，受到室内灰尘挑战的过滤器的TVOC排放率比受到室外灰尘挑战的过滤器高2-10倍。当环境VOCs浓度稳定时，TVOC排放速率与粉尘负荷之间存在线性关系。便携式空气滤清器中使用的过滤器的TVOC排放率在0.63mg / m2-3.46 mg / m2的范围内。在潮湿环境中接触后，总排放的TVOC通常随着烷烃，芳香族化合物，酯类和醇类的减少而减少，而醛类，酮类和烯烃的排放率增加。讨论了可能的原因。

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