Abstract
Soil biofiltration is an environmentally-sound technology for elimination of VOCs, odorous and <TEX>$NO_X$</TEX> compounds from a low concentration, high volume waste gas streams because of its simplicity and cost-effectiveness. This study investigated the optimal mixture fraction of briquet ash, compost, soil and loess for <TEX>$NO_X$</TEX> degradation. Extreme vertices design was used to examine the role of four components on <TEX>$NO_X$</TEX> degradation. Under our experimental conditions, 74.5% of <TEX>$NO_X$</TEX> degradation was observed, using a model mixture(25% briquet ash, 10% compost, 30% soil and 40% loess) containing 100 ppb of NO. It was shown that experimental design analysis could allow selecting optimal conditions in such biodegradation processes in this study.
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