As attached biomass systems, biofilters exhibit physicochemical gradients through the bed height (decrease of840 Appl Microbiol Biotechnol (2011) 90:837–849pollutant and increase of by-product concentrations), leading to heterogeneous environmental microhabitats. Most biofiltration studies highlighted a longitudinal distribution of biodegradation activities characterized by higher removal efficiency near the gas inlet (Cabrol et al. 2009). Are these concentration and activity profiles correlated to the microbial distribution?
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