Bioreactors supplied with sulfate and Fe(III) oxides (hematite and goethite), as electron acceptors, were tested for their capacity to remove dissolved methane from a digestate from a methanogenic reactor treating synthetic wastewater. Negligible removal of dissolved methane occurred when no electron acceptor was provided. However, when hematite and goethite were supplied, methane removal rates of 6.7 and 3.7 g CH