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• W2900468525 abstract "Nitrogen is a fundamental element for all organisms. It is nevertheless predominantlyfound in the atmosphere, in the form of unreactive nitrogen. In the last century, a manmademethod for nitrogen fixation improved the crops yield, fuelling a populational growth.The exponential increase of anthropogenic nitrogen in soils and water bodies has, however,affected the environment and deregulated the natural biogeochemical nitrogen cycle. Currently,the costs of repairing the damage caused by the reactive nitrogen load from humanactivities have overcome the profits of the agricultural improvement, derived from the applicationof fertilizers. Wastewater treatment plants remove the excessive amounts of nutrientssuch as carbon, nitrogen and phosphorus from wastewater to prevent environmentalimpacts derived from excessive nitrogen in the biosphere, like eutrophication.The current conventional wastewater treatment applied is nitrification coupled with denitrification.However, the requirement for an external carbon source and aeration renderthis process costly. Furthermore, one of the intermediates of denitrification is nitrous oxide,a greenhouse gas with an effect three hundred times worse than carbon dioxide and witha lifespan of one hundred and twenty years in the ozone layer.The Partial Nitrification/Anammox (PNA) process combines aerobic ammonium oxidationwith anaerobic ammonium oxidation while suppressing the activity of nitrite oxidizingbacteria. This efficient process of nitrogen removal from wastewater reduces the aerationcost and the need for external carbon with zero nitrous oxide emissions.Unknown microbial interactions may, on the other hand, impair this process, resulting insuboptimal performance such as, excessive nitrate and nitrous oxide emissions. To betterunderstand the microbial community and its interactions and to find the causes of the treatmentsinstability, metabolic analysis and genomic annotation was performed, using twocomplementary binning methods. The biological samples used in this study were retrievedfrom a high-rate PNA sequencing batch reactor, fed with carbon-free ammonium-rich syntheticwastewater.Fifty-seven draft genomes making up about eighty percent of the total community metagenomewere recovered. In addition to the three genomes each from Nitrosomonas and CandidatusBrocadia, several genomes belonged to Proteobacteria, Chloroflexi, Planctomycetes, Bacteroidetes, Armatimonadetes, Ignavibacteriae, Acidobacteria, Chlorobi, Verrucomicrobia, Actinobacteriaand Gemmatimonadetes phyla.In this study, the heterotrophic organisms encoding partial denitrification could be dividedinto niches accordingly to their role in this pathway, describing their interactions asa community. The complexity of the community was also ascertained with the discovery ofputative heterotrophic hydroxylamine oxidizing bacteria and putative heterotrophic nitriteoxidizing bacteria.Overall, high quality genomes that constitute a high fraction of the metagenome…" @default.
• W2900468525 created "2018-11-29" @default.
• W2900468525 creator A5041292571 @default.
• W2900468525 date "2017-01-01" @default.
• W2900468525 modified "2023-09-27" @default.
• W2900468525 title "Metagenomic analysis of a Nitritation - Anammox reactor: community members and processes" @default.
• W2900468525 hasPublicationYear "2017" @default.
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