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Tetramethylammonium (QMA) profile (a) and quantitative distribution of archaeal populations in the full-scale UASB reactor for treating tetramethylammonium-rich wastewater as revealed by the pyrosequencing 16S rRNA gene amplicons (sequence abundance >0.8%) (b). “Other H2 methanogens” included the low abundant populations, namely, Methanolinea (<0.07%), Methanoculleus (<0.01%), Methanospirillum (<0.03%), Methanobrevibacter (<0.03%), Methanosphaera (<0.01%), and Methanococcus (<0.01%).
