SRP486927 PRJNA1069746 Impact of supportive materials on syntrophic propionate and acetate enrichments under high-ammonia Work performed with the aim of increasing the fundamental understanding of the addition of supportive materials on the anaerobic acetate and propionate degradation, and on methane production by syntrophic communities under high ammonia and mesophilic conditions. To specifically focus on the syntrophic microorganisms and their interactions, highly enriched syntrophic communities of acid-oxidizing bacteria (SPOB and SAOB) and hydrogenotrophic methanogens were used in batch trials containing either the conductive materials graphene powder or iron oxide (II, III) nanoparticles, or non-conductive zeolite clinoptilolite.