Microbial community analysis showed that Thermacetogenium spp.  (known syntrophic acetate oxidizers) and hydrogenotrophic methanogens closely related to Methanothermobacter spp.  The acetate/β-FeOOH (akaganéite) microcosms, however, differed by the dominance of archaea closely related to the acetoclastic Methanosaeta thermophila. 
THERM