The Synergy of Fe(Iii) and No2- Drives the Anaerobic Oxidation of Methane
The anaerobic oxidation of methane (AOM) driven by NO2- or Fe(III) alone was limited by slow electron delivery and ineffective enrichment of microbes. The flexible coupling between Fe(III) and NO2- potentially cooperated to accelerate AOM. To verify the synergy and microbial role of Fe(III) and NO2- to improve AOM, one negative control was fed CH4 and NO2- , and four treatment reactors were supplemented with CH4 , NO2- and ferric citrate (FC)/ferric chloride (FCH)/chelate iron (FCI)/ferric hydroxide (FH) and were anaerobically operated for 1200 days. The changes in gas and ion profiles were observed in the reactors, and microbial development was studied by 16S rRNA gene Illumina sequencing. The results indicated that combined Fe(III) and NO2- treatment could improve AOM, and their synergy followed the order of FC>FCI>FCH>FH. The biochemical reaction of Fe3+ with NO2- and its secondary process accelerated electron transfer to microbial cells and therefore enhanced AOM in the reactors. Total organic carbon (TOC), NH4+ , NO3- , and pH value impacted dominant bacteria the most in the FC reactor, FCI, FCH, and FH groups, respectively. Several dominant bacterial species were enriched, whereas only two archaea were highly concentrated in the FC and FCI groups. Only bacteria survived in the FCH group, and archaea contributed a large amount in the FH group. These findings contribute to an improved understanding of the interactions among nitrogen, iron and CH4 that are paramount to accelerating the process of AOM for engineering applications
Year of publication: |
[2022]
|
---|---|
Authors: | Chen, Weiqi ; Yu, Xiuling ; Huang, Juan ; Zhao, Wurong ; Ju, Jinwei ; Ye, Jinshao ; Long, Yan |
Publisher: |
[S.l.] : SSRN |
Saved in:
freely available
Saved in favorites
Similar items by person
-
Cao, Chong, (2022)
-
Pan, Zhiyuan, (2023)
-
Heterogeneous returns to education across Hukou-migration subgroups in China
Huang, Juan, (2023)
- More ...