Abstract
A method to use fences of activated carbon fiber (ACF) is presented to reduce high NO2, PM, and VOCs concentrations in urban atmosphere without excess energy use. Polluted air in road space moves with natural and car-induced winds to contact with and to flow through ACF fences, and the ACF layer removes these pollutants. That this “energy-free” equipment can reduce high NOx by 15–50 % at the roadside is numerically evaluated.
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References
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Questions and Answers
Questioner Name: Anthony Dore
Q: ACF was shown to capture NO2 more efficiently than NO. With vehicle emissions changing towards a higher fraction of NO2 in primary emissions, will the fences have a greater impact?
A: The ACF will more effectively reduce ambient NOx concentration with a higher fraction of NO2 in vehicle emissions, since a higher fraction of NO2 in ambient NOx concentration leads to a larger removal rate coefficient of NOx, k. However, it may also be noted that the NOx removal by the ACF fences is rather diffusion-limited if the k value is larger than about 1 s−1.
Questioner Name: Peter Builtjes
Q: Does the ACF also work for PM?
A: The ACF can remove PM, and the removal is more efficient for particles coarser than sub-micron.
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Kitada, T., Kurodai, Y., Shimohara, T., Kanzaki, T., Yoshikawa, M., Tokairin, T. (2014). Numerical Study on Reduction of Ambient NOx, PM, and VOCs Concentrations by ACF (Activated Carbon Fiber) Fences: Effects of Generated Air Flow and Chemical Reactivity of the ACF Fences. In: Steyn, D., Builtjes, P., Timmermans, R. (eds) Air Pollution Modeling and its Application XXII. NATO Science for Peace and Security Series C: Environmental Security. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-5577-2_27
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DOI: https://doi.org/10.1007/978-94-007-5577-2_27
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