The benefits of autotrophic nitrogen removal from high concentration of urea wastewater through a process of urea hydrolysis and partial nitritation in sequencing batch reactor

Chen, Yongxing; Chen, Haochuan; Chen, Zhenguo; Hu, Haolin; Deng, Cuilan; Wang, Xiaojun

doi:10.1016/j.jenvman.2021.112762

Cited by 15 publications

(4 citation statements)

References 40 publications

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“…The first cultured species, G. aurantiaca, was isolated from activated sludge [8], and higher proportions of both heterotrophic and photoheterotrophic Gemmatimonadota were detected in wastewater metagenomes [17]. In batch reactors used for pretreatment of urea wastewater, Gemmatimonadota became the dominant group and increased their relative abundance to over 50%, exceeding that of even Proteobacteria [108]. It seems that this group could be connected to intracellular urea hydrolysis [109], and urea could be used as an energy source and an important substrate [108].…”

Section: Other Environmentsmentioning

confidence: 99%

“…In batch reactors used for pretreatment of urea wastewater, Gemmatimonadota became the dominant group and increased their relative abundance to over 50%, exceeding that of even Proteobacteria [108]. It seems that this group could be connected to intracellular urea hydrolysis [109], and urea could be used as an energy source and an important substrate [108]. Gemmatimonadota were also abundant in aquaculture wastewater and in soil irrigated with this water [110], an outlet of wastewater generated during nitrocellulose production [111], and wastewater treatment plants with high salinity [112].…”

Section: Other Environmentsmentioning

confidence: 99%

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Phylum Gemmatimonadota and Its Role in the Environment

2022

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Bacteria are an important part of every ecosystem that they inhabit on Earth. Environmental microbiologists usually focus on a few dominant bacterial groups, neglecting less abundant ones, which collectively make up most of the microbial diversity. One of such less-studied phyla is Gemmatimonadota. Currently, the phylum contains only six cultured species. However, data from culture-independent studies indicate that members of Gemmatimonadota are common in diverse habitats. They are abundant in soils, where they seem to be frequently associated with plants and the rhizosphere. Moreover, Gemmatimonadota were found in aquatic environments, such as freshwaters, wastewater treatment plants, biofilms, and sediments. An important discovery was the identification of purple bacterial reaction centers and anoxygenic photosynthesis in this phylum, genes for which were likely acquired via horizontal gene transfer. So far, the capacity for anoxygenic photosynthesis has been described for two cultured species: Gemmatimonas phototrophica and Gemmatimonas groenlandica. Moreover, analyses of metagenome-assembled genomes indicate that it is also common in uncultured lineages of Gemmatimonadota. This review summarizes the current knowledge about this understudied bacterial phylum with an emphasis on its environmental distribution.

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Section: Other Environmentsmentioning

confidence: 99%

Section: Other Environmentsmentioning

confidence: 99%

Phylum Gemmatimonadota and Its Role in the Environment

2022

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“…3). Gemmatimonadota has also been reported to hydrolyse urea as an energy source in wastewater treatment sludge 43,44 . However, we only identi ed urease (UreABC) from a single MAG in Group4 (M3-22_Bin_219), suggesting this is not important in marine environments.…”

Section: Metabolic Exibility Of Gemmatimonadota Enables Their Wide Di...mentioning

confidence: 99%

Globally distributed marine Gemmatimonadota have unique genomic potentials

Baker,

Gong,

et al. 2024

Preprint

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Gemmatimonadota bacteria are widely distributed in nature, but their metabolic potential and ecological roles in marine environments is poorly understood. Here, we obtained 495 metagenome-assembled genomes (MAGs), and associated viruses, from coastal to deep-sea sediments around the world. We used this expanded genomic catalog to compare the protein composition, and update the phylogeny of these bacteria. The marine Gemmatimonadota are phylogenetically different from those previously reported from terrestrial environments. Functional analyses of these genomes revealed these marine genotypes are capable of degradation of complex organic carbon, denitrification, sulfate reduction, and oxidizing sulfide and sulfite. Interestingly, there is widespread genetic potential for secondary metabolite biosynthesis across Gemmatimonadota, which may represent an unexplored source of novel natural products. Lineages associated with coral reefs are enriched in genes encoding secondary metabolites, which are likely utilized for ecological interactions there. Furthermore, viruses associated with Gemmatimonadota have the potential to ‘hijack’ and manipulate host metabolism, including the assembly of the lipopolysaccharide in their hosts. This expanded genomic diversity advances our understanding of these globally distributed bacteria across a variety of ecosystems and reveals genetic distinctions between those in terrestrial and marine communities.

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“…Urease activity is common in the environment. Many microorganisms hydrolyze urea intercellularly into NH 4 + and HCO 3 − , and use the resulting proton gradient for ATP synthesis [45]. Thus, it is not surprising that the NH 4 + concentrations in the control and sound-treated digestates were virtually identical.…”

Section: Volatile Fatty Acids and Ammoniummentioning

confidence: 99%

Acoustic Stimulation of Anaerobic Digestion: Effects on Biogas Production and Wastewater Malodors

Loughrin¹,

Silva²,

Lovanh³

et al. 2022

Environments

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Wastewater created from various solid wastes and agricultural residues was treated by anaerobic digestion, and the biogas and wastewater odors were quantified. One digester was exposed to low-frequency sound (<5 kHz) from underwater loudspeakers, while the other received no sonic treatment. It was hypothesized that low-frequency sound, by accelerating the breakdown of sludge via mechanisms such as cavitation induction and mechanical vibration, and enhancing biogas production, could also affect the concentrations of wastewater odors. During warm seasons, biogas production from the sound-treated digester was 29% higher than that from the control digester, and 184% higher during the cool season. Malodors—Mainly consisting of typical aromatic malodorants such as p-cresol and skatole, aliphatic secondary ketones, and dimethyl disulfide—were quantified. In contrast to the findings for biogas production, little difference was found in the concentrations of volatile compounds in the control and sound-treated digestates. Concentrations of dimethyl polysulfides increased over time in both the control and sound-treated digestates, likely due to the use of recycled system effluent that contained precipitated elemental sulfur. The digestate contained considerable concentrations of volatile fatty acids and ammonium, but due to the near neutral pH of the digestate it was surmised that neither made appreciable contributions to the wastewater’s malodor. However, the volatile fatty acid concentrations were reduced by sonic treatment, which was not unexpected, since volatile fatty acids are precursors to methane. Therefore, although sonic treatment of the anaerobic digestate boosted biogas production, it did not markedly affect the wastewater malodors. The biosynthetic origins of wastewater malodors are discussed in this paper.

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The benefits of autotrophic nitrogen removal from high concentration of urea wastewater through a process of urea hydrolysis and partial nitritation in sequencing batch reactor

Cited by 15 publications

References 40 publications

Phylum Gemmatimonadota and Its Role in the Environment

Phylum Gemmatimonadota and Its Role in the Environment

Globally distributed marine Gemmatimonadota have unique genomic potentials

Acoustic Stimulation of Anaerobic Digestion: Effects on Biogas Production and Wastewater Malodors

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