Microbes in Global Carbon, Sulfur, and Nitrogen Cycles

A special issue of Life (ISSN 2075-1729). This special issue belongs to the section "Microbiology".

Deadline for manuscript submissions: closed (2 September 2022) | Viewed by 6532

Special Issue Editor


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Guest Editor
Division of Biology Education, Department of Science Education, Jeju National University, Jeju 63243, Korea
Interests: microbial ecology; nitrogen cycle; nitrification; denitrification; archaea; comammox; global warming

Special Issue Information

Dear Colleagues,

Our planet is saturated with microbes; with approximately 5.0×1030 cells on our planet, the number of microbes is around 108 greater than the number of stars in the observable universe. Microbes constitute an entire world unseen by the naked eye. However, the processes performed by microbes in this invisible world, due to their great abundance, remarkable metabolic capacities, and adaptation potential, significantly affect our visible world. These processes include virtually every chemical reaction in the biosphere that constitutes the main biogeochemical cycles (carbon, nitrogen, sulfur), which are the primary materials on our planet and are necessary for all life. The role of microorganisms in the primary biogeochemical cycles of terrestrial, freshwater, and marine ecosystems is presented. Consequently, they are believed to be key players in the adaptation, control, and recovery of our ecosystems.

The biodiversity of microorganisms is highlighted, and their metabolic pathways based on exchanges and biotransformation of the elements (carbon, nitrogen, sulfur) within ecosystems need to be discussed. The impacts of human activities on the microbial actors and processes of biogeochemical cycles, as well as the cascading ecological effects (greenhouse gas emissions, acid rains, dystrophic crises, etc.), also need to be discussed.

The processes also involve interactions between organisms, both among microbes and between microbes and large organisms in biogeochemical cycles. These interactions are further affected by changes in climate. Therefore, we need to explore this world, the creatures that inhabit it, and the things they do.

Dr. Man-Young Jung
Guest Editor

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Keywords

  • microbial ecology
  • environmental microbiology
  • metagenomics
  • carbon cycle
  • nitrogen cycle
  • sulfur cycle
  • nitrification
  • denitrification
  • methane oxidation
  • methanogen

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Published Papers (2 papers)

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Research

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15 pages, 1771 KiB  
Article
Abundance and Niche Differentiation of Comammox in the Sludges of Wastewater Treatment Plants That Use the Anaerobic–Anoxic–Aerobic Process
by Sheng-Nan Zhang, Jian-Gong Wang, Dan-Qi Wang, Qiu-Yue Jiang and Zhe-Xue Quan
Life 2022, 12(7), 954; https://doi.org/10.3390/life12070954 - 24 Jun 2022
Cited by 3 | Viewed by 1813
Abstract
Complete ammonia oxidizers (comammox), which directly oxidize ammonia to nitrate, were recently identified and found to be ubiquitous in artificial systems. Research on the abundance and niche differentiation of comammox in the sludges of wastewater treatment plants (WWTPs) would be useful for improving [...] Read more.
Complete ammonia oxidizers (comammox), which directly oxidize ammonia to nitrate, were recently identified and found to be ubiquitous in artificial systems. Research on the abundance and niche differentiation of comammox in the sludges of wastewater treatment plants (WWTPs) would be useful for improving the nitrogen removal efficiency of WWTPs. Here, we investigated the relative abundance and diversity of comammox in fifteen sludges of five WWTPs that use the anaerobic–anoxic–aerobic process in Jinan, China, via quantitative polymerase chain reaction and high-throughput sequencing of the 16S rRNA gene and ammonia monooxygenase gene. In the activated sludges in the WWTPs, comammox clade A.1 was widely distributed and mostly comprised Candidatus Nitrospira nitrosa-like comammox (>98% of all comammox). The proportion of this clade was negatively correlated (p < 0.01) with the dissolved oxygen (DO) level (1.7–8 mg/L), and slight pH changes (7.20–7.70) affected the structure of the comammox populations. Nitrospira lineage I frequently coexisted with Nitrosomonas, which generally had a significant positive correlation (p < 0.05) with the DO level. Our study provided an insight into the structure of comammox and other nitrifier populations in WWTPs that use the anaerobic–anoxic–aerobic process, broadening the knowledge about the effects of DO on comammox and other nitrifiers. Full article
(This article belongs to the Special Issue Microbes in Global Carbon, Sulfur, and Nitrogen Cycles)
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Review

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14 pages, 2246 KiB  
Review
Nitrous Oxide Emission from Full-Scale Anammox-Driven Wastewater Treatment Systems
by Zhiman Lin, Kayan Ma and Yuchun Yang
Life 2022, 12(7), 971; https://doi.org/10.3390/life12070971 - 28 Jun 2022
Cited by 8 | Viewed by 4049
Abstract
Wastewater treatment plants (WWTPs) are important contributors to global greenhouse gas (GHG) emissions, partly due to their huge emission of nitrous oxide (N2O), which has a global warming potential of 298 CO2 equivalents. Anaerobic ammonium-oxidizing (anammox) bacteria provide a shortcut [...] Read more.
Wastewater treatment plants (WWTPs) are important contributors to global greenhouse gas (GHG) emissions, partly due to their huge emission of nitrous oxide (N2O), which has a global warming potential of 298 CO2 equivalents. Anaerobic ammonium-oxidizing (anammox) bacteria provide a shortcut in the nitrogen removal pathway by directly transforming ammonium and nitrite to nitrogen gas (N2). Due to its energy efficiency, the anammox-driven treatment has been applied worldwide for the removal of inorganic nitrogen from ammonium-rich wastewater. Although direct evidence of the metabolic production of N2O by anammox bacteria is lacking, the microorganisms coexisting in anammox-driven WWTPs could produce a considerable amount of N2O and hence affect the sustainability of wastewater treatment. Thus, N2O emission is still one of the downsides of anammox-driven wastewater treatment, and efforts are required to understand the mechanisms of N2O emission from anammox-driven WWTPs using different nitrogen removal strategies and develop effective mitigation strategies. Here, three main N2O production processes, namely, hydroxylamine oxidation, nitrifier denitrification, and heterotrophic denitrification, and the unique N2O consumption process termed nosZ-dominated N2O degradation, occurring in anammox-driven wastewater treatment systems, are summarized and discussed. The key factors influencing N2O emission and mitigation strategies are discussed in detail, and areas in which further research is urgently required are identified. Full article
(This article belongs to the Special Issue Microbes in Global Carbon, Sulfur, and Nitrogen Cycles)
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