Microbiology and potential applications of aerobic methane oxidation coupled to denitrification (AME-D) process: A review

Zhu, Jing; Wang, Qian; Yuan, Mengdong; Tan, Giin-Yu Amy; Sun, Fenglian; Wang, Cheng; Wu, Weixiang; Lee, Po‐Heng

doi:10.1016/j.watres.2015.12.020

Cited by 139 publications

(47 citation statements)

References 111 publications

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“…Geochemically, the expression of the pmoA and mmoX is triggered by the amount of available Cu ions. In addition, aerobic CH 4 oxidation has been previously coupled to denitrification in groundwater (Zhu et al, 2016). Besides methanotrophic bacteria, anaerobic CH 4 -oxidising archaea (ANME) also play a significant role in the oxidation of CH 4 in both freshwater and saline water sources (Knittel and Boetius, 2009).…”

Section: Methane Oxidation In Freshwatermentioning

confidence: 99%

Biogeochemical constraints on the origin of methane in an alluvial aquifer: evidence for the upward migration of methane from underlying coal measures

et al. 2017

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Abstract. Geochemical and microbiological indicators of methane (CH 4 ) production, oxidation and migration processes in groundwater are important to understand when attributing sources of gas. The processes controlling the natural occurrence of CH 4 in groundwater must be understood, especially when considering the potential impacts of the global expansion of coal seam gas (CSG) production on groundwater quality and quantity. We use geochemical and microbiological data, along with measurements of CH 4 isotopic composition (δ 13 C-CH 4 ), to determine the processes acting upon CH 4 in a freshwater alluvial aquifer that directly overlies coal measures targeted for CSG production in Australia. Measurements of CH 4 indicate that there is biogenic CH 4 in the aquifer; however, microbial data indicate that there are no methanogenic archaea in the groundwater. In addition, geochemical data, particularly the isotopes of dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC), as well as the concentration of SO 2− 4 , indicate limited potential for methanogenesis in situ. Microbial community analysis also shows that aerobic oxidation of CH 4 occurs in the alluvial aquifer. The combination of microbiological and geochemical indicators suggests that the most likely source of CH 4 , where it was present in the freshwater aquifer, is the upward migration of CH 4 from the underlying coal measures.

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Section: Methane Oxidation In Freshwatermentioning

confidence: 99%

Biogeochemical constraints on the origin of methane in an alluvial aquifer: evidence for the upward migration of methane from underlying coal measures

et al. 2017

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“…According to the genome sequence of Methanocellaceae (Erkel et al, 2006), a unique set of genes encoding antioxidant enzymes and oxygen-insensitive fermentation enzymes were found, which probably improved their ability to adapt to alternate dry/wet conditions. Although nitrate nitrogen may compete for electrons, which was crucial for methane production (Lai et al, 2016;Zhu et al, 2016), stimulation of plant growth by nitrate based fertilizers can enhance methane production by increased organic carbon availability for fermenting microbes delivering methanogenic substrates (Banger et al, 2012). Thus, the effects of nitrate nitrogen on methane emission were complicated.…”

Section: Discussionmentioning

confidence: 99%

Stimulation of long-term ammonium nitrogen deposition on methanogenesis by Methanocellaceae in a coastal wetland

Xiao

Xie

Liu

et al. 2017

Science of The Total Environment

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“…These microbes can oxidize CH 4 to carbon dioxide (CO 2 ) in the presence of oxygen (O 2 ). Metabolic pathways of methane oxidation in aerobic methanotrophs are comprehensively summarized by other researchers (Trotsenko and Murrell, 2008; Zhu et al, 2016; Figure 1). Briefly, CH 4 is initially catalyzed by methane monooxygenase (MMO), soluable MMO (sMMO) or particulate MMO (pMMO), to produce methanol as the first intermediate.…”

Section: Introductionmentioning

confidence: 95%

“…Traditional metabolism of methane in aerobic methanotrophs (modified from Zhu et al, 2016). pMMO, particulate methane monooxygenase; sMMO, soluble methane monooxygenase; MDH, methanol dehydrogenase; FDH a , formaldehyde dehydrogenase; FDH b , formate dehydrogenase; RuMP, ribulose monophosphate pathway.…”

Section: Introductionmentioning

confidence: 99%

“…It was hypothesized that intermediates released by methanotrophs primarily control nitrogen removal when O 2 :CH 4 ratio is below the optimal value, whereas O 2 level mainly controls nitrogen removal when O 2 :CH 4 ratio is over the optimal. According to the stoichiometric (Equations 1 and 2) of the AME-D process (Zhu et al, 2016), the O 2 :CH 4 ratio should be maintained below 1.1:1 (more specifically 0, 0.05, 0.25, and 1.0 in this study) to avoid excessive O 2 inhibition on denitrification.…”

Section: Introductionmentioning

confidence: 99%

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Optimum O2:CH4 Ratio Promotes the Synergy between Aerobic Methanotrophs and Denitrifiers to Enhance Nitrogen Removal

Zhu

Yuan

et al. 2017

Front. Microbiol.

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The O2:CH4 ratio significantly effects nitrogen removal in mixed cultures where aerobic methane oxidation is coupled with denitrification (AME-D). The goal of this study was to investigate nitrogen removal of the AME-D process at four different O2:CH4 ratios [0, 0.05, 0.25, and 1 (v/v)]. In batch tests, the highest denitrifying activity was observed when the O2:CH4 ratio was 0.25. At this ratio, the methanotrophs produced sufficient carbon sources for denitrifiers and the oxygen level did not inhibit nitrite removal. The results indicated that the synergy between methanotrophs and denitrifiers was significantly improved, thereby achieving a greater capacity of nitrogen removal. Based on thermodynamic and chemical analyses, methanol, butyrate, and formaldehyde could be the main trophic links of AME-D process in our study. Our research provides valuable information for improving the practical application of the AME-D systems.

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Microbiology and potential applications of aerobic methane oxidation coupled to denitrification (AME-D) process: A review

Cited by 139 publications

References 111 publications

Biogeochemical constraints on the origin of methane in an alluvial aquifer: evidence for the upward migration of methane from underlying coal measures

Biogeochemical constraints on the origin of methane in an alluvial aquifer: evidence for the upward migration of methane from underlying coal measures

Stimulation of long-term ammonium nitrogen deposition on methanogenesis by Methanocellaceae in a coastal wetland

Optimum O2:CH4 Ratio Promotes the Synergy between Aerobic Methanotrophs and Denitrifiers to Enhance Nitrogen Removal

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