形成和运输的二次污染物 相关的杀菌紫外线光系统 在一个被占用的教室中
Seongjun Park1, Youngbo Won1, Donghyun Rim1
1Department of Architectural Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States.
Environmental science & technology
|June 26, 2024
概括
杀菌紫外线 (GUV) 系统可以产生臭氧和二次有机气溶. 这项研究模拟了GUV 254和222nm系统,发现GUV 222比GUV 254产生更多的臭氧和气溶.
科学领域:
- 室内空气质量 室内空气质量
- 摄影化学的使用.
- 建筑系统工程 建筑系统工程
背景情况:
- 杀菌紫外线 (GUV) 系统用于控制建筑物中的空气传播病原体.
- GUV系统,特别是使用UV-C 254和222纳米波长的系统,可以无意中产生氧化剂和二次有机气溶 (SOA) 等空气污染物.
研究的目的:
- 从GUV系统 (UV-C 254和222 nm) 中建模氧化剂和二次污染物的形成和分散.
- 评估GUV系统参数和室内通风对占用呼吸区污染物度的影响.
主要方法:
- 使用了一个三维计算流体动力学 (CFD) 模型.
- 模拟GUV系统在占用教室环境中的操作.
- 分析了臭氧 (O3) 和二次有机气溶 (SOA) 的呼吸区度.
主要成果:
- 与没有GUV相比,GUV 222操作增加了约10ppb的O3和约5.2μg·m-3的SOA.
- 在GUV 254操作中,SOA增加了约1.2μg·m-3,O3的影响最小.
- 较高的紫外线流动率和辐射量通常会增加氧化剂和SOA度.
- 与混合良好的空气流相比,排位通风导致呼吸区的SOA度降低了15-45%.
- 在通风速率<2h-1时,GUV 254对二次污染物暴露的影响小于GUV 222,除非室内O3水平高 (>15ppb).
结论:
- GUV系统的设计必须考虑到室内臭氧水平和室内通风条件.
- 在GUV 222和GUV 254之间做出选择可能取决于特定的室内空气质量参数和所需的病原体控制水平.
- 优化GUV系统的运行需要平衡病原体无活化效率与潜在的二次污染物产生.
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