Effects of bioelectricity generation processes on methane emission and bacterial community in wetland and carbon fate analysis

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Abstract

Wetlands are an important carbon sink for greenhouse gases (GHGs), and embedding microbial fuel cell (MFC) into constructed wetland (CW) has become a new technology to control methane (CH ₄) emission. Rhizosphere anode CW–MFC was constructed by selecting rhizome-type wetland plants with strong hypoxia tolerance, which could provide photosynthetic organics as alternative fuel. Compared with non-planted system, CH ₄ emission flux and power output from the planted CW–MFC increased by approximately 0.48 ± 0.02 mg/(m ²·h) and 1.07 W/m ³, respectively. The CH ₄ emission flux of the CW–MFC operated under open-circuit condition was approximately 0.46 ± 0.02 mg/(m ²·h) higher than that under closed-circuit condition. The results indicated that plants contributed to the CH ₄ emission from the CW–MFC, especially under open-circuit mode conditions. The CH ₄ emission from the CW–MFC was proportional to external resistance, and it increased by 0.67 ± 0.01 mg/(m ²·h) when the external resistance was adjusted from 100 to 1000 Ω. High throughput sequencing further showed that there was a competitive relationship between electrogenic bacteria and methanogens. The flora abundance of electrogenic bacteria was high, while methanogens mainly consisted of Methanothrix, Methanobacterium and Methanolinea. The form and content of element C were analysed from solid phase, liquid phase and gas phase. It was found that a large amount of carbon source (TC = 254.70 mg/L) was consumed mostly through microbial migration and conversion, and carbon storage and GHGs emission accounted for 60.38% and 35.80%, respectively. In conclusion, carbon transformation in the CW–MFC can be properly regulated via competition of microorganisms driven by environmental factors, which provides a new direction and idea for the control of CH ₄ emission from wetlands.

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Highlights

Effects of different operating conditions on CH ₄ emission.
The competitive relationship between electricigens and methanogens was analysed.
The morphology and content of C element in different phases were discussed.
The bacterial population structure under different conditions was analysed.
The mechanism of CH ₄ emission from CW–MFC was described in detail.

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Most cited references 59

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A comprehensive review of microbial electrochemical systems as a platform technology.

Heming Wang, Zhiyong Jason Ren (2013)

Microbial electrochemical systems (MESs) use microorganisms to covert the chemical energy stored in biodegradable materials to direct electric current and chemicals. Compared to traditional treatment-focused, energy-intensive environmental technologies, this emerging technology offers a new and transformative solution for integrated waste treatment and energy and resource recovery, because it offers a flexible platform for both oxidation and reduction reaction oriented processes. All MESs share one common principle in the anode chamber, in which biodegradable substrates, such as waste materials, are oxidized and generate electrical current. In contrast, a great variety of applications have been developed by utilizing this in situ current, such as direct power generation (microbial fuel cells, MFCs), chemical production (microbial electrolysis cells, MECs; microbial electrosynthesis, MES), or water desalination (microbial desalination cells, MDCs). Different from previous reviews that either focus on one function or a specific application aspect, this article provides a comprehensive and quantitative review of all the different functions or system constructions with different acronyms developed so far from the MES platform and summarizes nearly 50 corresponding systems to date. It also provides discussions on the future development of this promising yet early-stage technology. © 2013.

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Large-scale controls of methanogenesis inferred from methane and gravity spaceborne data.

A. Joseph Bloom, Christian Frankenberg, D Reay … (2010)

Wetlands are the largest individual source of methane (CH4), but the magnitude and distribution of this source are poorly understood on continental scales. We isolated the wetland and rice paddy contributions to spaceborne CH4 measurements over 2003-2005 using satellite observations of gravity anomalies, a proxy for water-table depth Gamma, and surface temperature analyses TS. We find that tropical and higher-latitude CH4 variations are largely described by Gamma and TS variations, respectively. Our work suggests that tropical wetlands contribute 52 to 58% of global emissions, with the remainder coming from the extra-tropics, 2% of which is from Arctic latitudes. We estimate a 7% rise in wetland CH4 emissions over 2003-2007, due to warming of mid-latitude and Arctic wetland regions, which we find is consistent with recent changes in atmospheric CH4.

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Metabolites produced by Pseudomonas sp. enable a Gram-positive bacterium to achieve extracellular electron transfer.

Monica Höfte, Hai Pham, Peter Clauwaert … (2007)

Previous studies revealed the abundance of Pseudomonas sp. in the microbial community of a microbial fuel cell (MFC). These bacteria can transfer electrons to the electrode via self-produced phenazine-based mediators. A MFC fed with acetate where several Pseudomonas sp. were present was found to be rich in a Gram-positive bacterium, identified as Brevibacillus sp. PTH1. Remarkably, MFCs operated with only the Brevibacillus strain in their anodes had poor electricity generation. Upon replacement of the anodic aqueous part of Brevibacillus containing MFCs with the cell-free anodic supernatants of MFCs operated with Pseudomonas sp. CMR12a, a strain producing considerable amounts of phenazine-1-carboxamide (PCN) and biosurfactants, the electricity generation was improved significantly. Supernatants of Pseudomonas sp. CMR12a_Reg, a regulatory mutant lacking the ability to produce PCN, had no similar improvement effect. Purified PCN, together with rhamnolipids as biosurfactants (1 mg L(-1)), could clearly improve electricity generation by Brevibacillus sp. PTH1, as well as enable this bacterium to oxidize acetate with concomitant reduction of ferric iron, supplied as goethite (FeOOH). When added alone, PCN had no observable effects on Brevibacillus' electron transfer. This work demonstrates that metabolites produced by Pseudomonas sp. enable Gram-positive bacteria to achieve extracellular electron transfer. Possibly, this bacterial interaction is a key process in the anodic electron transfer of a MFC, enabling Brevibacillus sp. PTH1 to achieve its dominance.

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Author and article information

Contributors

Shentan Liu:

ORCID: http://orcid.org/0000-0002-1894-0012

liushentan@seu.edu.cn

Xiaojuan Feng: fengxiaojuanxj@163.com

Journal

Journal ID (nlm-ta): Bioresour Bioprocess

Journal ID (iso-abbrev): Bioresour Bioprocess

Title: Bioresources and Bioprocessing

Publisher: Springer Nature Singapore (Singapore )

ISSN (Electronic): 2197-4365

Publication date (Electronic): 20 June 2022

Publication date PMC-release: 20 June 2022

Publication date Collection: December 2022

Volume: 9

Issue: 1

Electronic Location Identifier: 69

Affiliations

[1 ]GRID grid.440720.5, ISNI 0000 0004 1759 0801, College of Geology and Environment, , Xi’an University of Science and Technology, ; Xi’an, 710054 Shaanxi China

[2 ]GRID grid.4514.4, ISNI 0000 0001 0930 2361, Biotechnology, Department of Chemistry, Faculty of Engineering, , Lund University, ; 22100 Lund, Sweden

[3 ]GRID grid.12527.33, ISNI 0000 0001 0662 3178, School of Environment, , Tsinghua University, ; Beijing, 100084 China

[4 ]GRID grid.440661.1, ISNI 0000 0000 9225 5078, School of Water and Environment, , Chang’an University, ; Xi’an, 710054 Shaanxi China

Author information

Shentan Liu http://orcid.org/0000-0002-1894-0012

Article

Publisher ID: 558

DOI: 10.1186/s40643-022-00558-8

PMC ID: 10991962

SO-VID: 7bfecf93-0987-4cb9-ab9c-1b70c39f3a8b

License:

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

History

Date received : 18 March 2022

Date accepted : 8 June 2022

Funding

Funded by: FundRef http://dx.doi.org/10.13039/501100001809, National Natural Science Foundation of China;

Award ID: 21806128

Award Recipient : Shentan Liu

Funded by: FundRef http://dx.doi.org/10.13039/501100007128, Natural Science Foundation of Shaanxi Province;

Award ID: 2019JQ-300

Award Recipient : Shentan Liu

Funded by: FundRef http://dx.doi.org/10.13039/501100010031, Postdoctoral Research Foundation of China;

Award ID: 2019M653701

Award Recipient : Shentan Liu

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Keywords: constructed wetland,microbial fuel cell,greenhouse gas,methane,fate pathway

Data availability:

Keywords: constructed wetland, microbial fuel cell, greenhouse gas, methane, fate pathway

Effects of bioelectricity generation processes on methane emission and bacterial community in wetland and carbon fate analysis

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Most cited references 59

A comprehensive review of microbial electrochemical systems as a platform technology.

Large-scale controls of methanogenesis inferred from methane and gravity spaceborne data.

Metabolites produced by Pseudomonas sp. enable a Gram-positive bacterium to achieve extracellular electron transfer.

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