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FUNCTIONAL GREEN WALL DEVELOPMENT FOR INCREASING AIR POLLUTANT PHYTOREMEDIATION: SUBSTRATE DEVELOPMENT WITH COCONUT COIR AND ACTIVATED CARBON
Pettit T., P.J. Irga, and F.R. Torpy.
Journal of Hazardous Materials 360:594-603(2018)

The capacity of several green wall media was tested to filter a range of air pollutants. Different-sized coconut husk-based substrates with different ratios of activated carbon (AC) were evaluated using scaled-down model "cassettes." Tests assessed the substrates' ability to filter particulate matter, benzene, ethyl acetate, and ambient total VOCs. The addition of AC to coconut husk media improved the removal efficiency for all gaseous pollutants but inhibited the removal efficiency of particulate matter. AC's gas remediation capacity became asymptotic as the substrate concentration approached 50%, suggesting that a 50:50 composite medium provided the best VOC removal. In full-scale botanical biofilter modules, AC-based substrates increased benzene removal, yet decreased particulate matter removal despite the addition of plants.



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