A laboratory investigation of interactions between denitrifying anaerobic methane oxidation (DAMO) and anammox processes in anoxic environments.
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.
Advanced Water Management Centre (AWMC), The University of Queensland, Brisbane. 4072, Australia.
Shihu
S
Hu
1] Advanced Water Management Centre (AWMC), The University of Queensland, Brisbane. 4072, Australia [2] Department of Chemistry, University of Science &Technology of China, Hefei. 230026, China.
Raymond J
RJ
Zeng
1] Advanced Water Management Centre (AWMC), The University of Queensland, Brisbane. 4072, Australia [2] Australian Centre for Ecogenomics, The University of Queensland, Brisbane. 4072, Australia.
Mohamed F
MF
Haroon
Advanced Water Management Centre (AWMC), The University of Queensland, Brisbane. 4072, Australia.
Jurg
J
Keller
1] Advanced Water Management Centre (AWMC), The University of Queensland, Brisbane. 4072, Australia [2] School of Chemical Engineering, The University of Queensland, Brisbane. 4072, Australia.
Paul A
PA
Lant
1] Advanced Water Management Centre (AWMC), The University of Queensland, Brisbane. 4072, Australia [2] Australian Centre for Ecogenomics, The University of Queensland, Brisbane. 4072, Australia.
Gene W
GW
Tyson
Advanced Water Management Centre (AWMC), The University of Queensland, Brisbane. 4072, Australia.
Zhiguo
Z
Yuan
D000693:Anaerobiosis; D019149:Bioreactors; D005285:Fermentation; D008697:Methane / Q000378:metabolism*; D009566:Nitrates / Q000378:metabolism; D009573:Nitrites / Q000378:metabolism; D010084:Oxidation-Reduction
D009566:Nitrates; D009573:Nitrites; D008697:Methane