A laboratory investigation of interactions between denitrifying anaerobic methane oxidation (DAMO) and anammox processes in anoxic environments

Citations Over TimeTop 10% of 2015 papers

Abstract

This study investigates interactions between recently identified denitrifying anaerobic methane oxidation (DAMO) and anaerobic ammonium oxidation (anammox) processes in controlled anoxic laboratory reactors. Two reactors were seeded with the same inocula containing DAMO organisms Candidatus Methanoperedens nitroreducens and Candidatus Methylomirabilis oxyfera, and anammox organism Candidatus Kuenenia stuttgartiensis. Both were fed with ammonium and methane, but one was also fed with nitrate and the other with nitrite, providing anoxic environments with different electron acceptors. After steady state reached in several months, the DAMO process became solely/primarily responsible for nitrate reduction while the anammox process became solely responsible for nitrite reduction in both reactors. 16S rRNA gene amplicon sequencing showed that the nitrate-driven DAMO organism M. nitroreducens dominated both the nitrate-fed (~70%) and the nitrite-fed (~26%) reactors, while the nitrite-driven DAMO organism M. oxyfera disappeared in both communities. The elimination of M. oxyfera from both reactors was likely the results of this organism being outcompeted by anammox bacteria for nitrite. K. stuttgartiensis was detected at relatively low levels (1-3%) in both reactors.

Related Papers

• → Ecological interactions and the underlying mechanism of anammox and denitrification across the anammox enrichment with eutrophic lake sediments(2023)84 cited
• → Denitrifying phosphorus removal by anaerobic/anoxic sequencing batch reactor(2001)38 cited
• → Combining anoxic denitrifying ability with aerobic–anoxic phosphorus-removal examinations to screen denitrifying phosphorus-removing bacteria(2006)33 cited
• [Improvement of denitrifying dephosphatation in an anaerobic/anoxic sequencing batch reactor and its stability].(2009)
• Factors affecting biological denitrifying dephosphatation in anaerobic/anoxic/aerobic sequencing batch reactor(2007)