Effects of different electron acceptors on the methanogenesis of hydrolyzed polyacrylamide biodegradation in anaerobic activated sludge systems

摘要

Graphical abstractDisplay OmittedHighlights?HPAM biodegradation was evaluated with SO42?and Fe3+as electron acceptors.?CH4production was improved with SO42?and Fe3+as the mixed electron acceptors.?Methanobacteriales,MethanomicrobialesandMethanosarcinaleswere dominant.?The thermodynamic opportunity windows of methane-producing were drawn.?Acetoclastic methanogenesis was dominant and hydrogenotrophic type was inhibited.