Functional green wall development for increasing air pollutant phytoremediation: Substrate development with coconut coir and activated carbon

Journal of Hazardous Materials
T PettitF R Torpy

Abstract

Functional green walls are gaining attention due to their air cleaning abilities, however the air cleaning capacity of these systems may be improved through substrate modification. This experiment investigated the capacity of several green wall media to filter a range of air pollutants. Media, consisting of differently sized coconut husk-based substrates, and with different ratios of activated carbon were evaluated through the use of scaled down model 'cassettes'. Tests were conducted assessing each substrate's ability to filter particulate matter, benzene, ethyl acetate and ambient total VOCs. While the particle size of coconut husk did not influence removal efficiency, the addition of activated carbon to coconut husk media improved the removal efficiency for all gaseous pollutants. Activated carbon as a medium component, however, inhibited the removal efficiency of particulate matter. Once the substrate concentration of activated carbon approached ∼50%, its gas remediation capacity became asymptotic, suggesting that a 50:50 composite medium provided the best VOC removal. In full-scale botanical biofilter modules, activated carbon-based substrates increased benzene removal, yet decreased particulate matter removal despite the ...Continue Reading

Citations

Feb 11, 2021·International Journal of Environmental Research and Public Health·Kyle L Alford, Naresh Kumar
Mar 9, 2021·Journal of Hazardous Materials·Thomas PettitPeter J Irga
Mar 13, 2021·Environmental Pollution·Antonello PrigionieroCarmine Guarino
May 1, 2021·International Journal of Environmental Research and Public Health·Nadia T SaifNaresh Kumar

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