scholarly journals Burial depth of anode affected the bacterial community structure of sediment microbial fuel cells

2019 ◽  
Vol 25 (6) ◽  
pp. 871-877 ◽  
Author(s):  
Yi-cheng Wu ◽  
Hong-jie Wu ◽  
Hai-yan Fu ◽  
Zhineng Dai ◽  
Ze-jie Wang
Keyword(s):  
Fuel Cells ◽  
Community Structure ◽  
Microbial Community ◽  
Microbial Diversity ◽  
Microbial Community Structure ◽  
Contaminated Soils ◽  
Microbial Fuel Cells ◽  
Rrna Gene ◽  
Burial Depth ◽  
Operational Taxonomic Units

Sediment microbial fuel cells (SMFCs) are attractive devices to in situ power environmental monitoring sensors and bioremediate contaminated soils/sediments. Burial depth of the anode was verified to affect the performance of SMFCs. The present research evaluated the differences in microbial community structure of anodic biofilms located at different depth. It was demonstrated that both microbial diversity and community structure of anodic biofilms were influenced by the depth of anode location. Microbial diversity decreased with increased anodic depth. The number of the operational taxonomic units (OTUs) was determined as 1438 at the anode depth of 5 cm, which reduced to 1275 and 1005 at 10 cm and 15 cm, respectively. Cluster analysis revealed that microbial communities of 5 cm and 10 cm were clustered together, separated from the original sediment and 15 cm. Proteobacteria was the predominant phylum in all samples, followed by Bacteroidetes and Firmicutes. Beta-and Gamma-proteobacteria were the most abundant classes. A total of 23 OTUs showed high identity to 16S rRNA gene of exoelectrogens such as Geobacter and Pseudomonas. The present results provided insights into the effects of anode depth on the performance of SMFC from the perspectives of microbial community structure.

scholarly journals Assessment of microbial communities in Nakivubo wetland and its catchment areas in Lake Victoria Basin, Uganda

2020 ◽  
Author(s):  
Bernard N. Kanoi ◽  
Maribet Gamboa ◽  
Doris Ngonzi ◽  
Thomas G. Egwang
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Diversity ◽  
Microbial Community Structure ◽  
Lake Victoria ◽  
Rrna Gene ◽  
Lake Victoria Basin ◽  
Structure Changes ◽  
Catchment Areas ◽  
Polluted Sites

AbstractMicrobial community structure changes are key in detecting and characterizing the impacts of anthropogenic activities on aquatic ecosystems. Here, we evaluated the effect of river pollution of industrial and urban sites on the microbial community composition and distribution in the Nakivubo wetland and its catchment areas in Lake Victoria basin, Uganda. Samples were collected from two industrial and one urban polluted sites and the microbial diversity was analyzed based on a 16S rRNA gene clone library. Differences in microbial diversity and community structure were observed at different sampling points. Bacteria associated with bioremediation were found in sites receiving industrial waste, while a low proportion of important human-pathogenic bacteria were seen in urban polluted sites. While Escherichia spp. was the most dominant genus of bacteria for all sites, three unique bacteria, Bacillus sp., Pseudomonas sp., Thermomonas sp., which have been reported to transform contaminants such as heavy metals and hydrocarbons (such as oils) by their metabolic pathways were also identified. Our results may serve as a basis for further studies assessing microbial community structure changes among polluted sites at Nakivubo Water Channel for management and monitoring. The diversity of natural microbial consortia could also be a rich bioprospecting resource for novel industrial enzymes, medicinal and bioactive compounds.

scholarly journals Biological degradation of potato pulp waste and microbial community structure in microbial fuel cells

RSC Advances ◽  
2017 ◽  
Vol 7 (14) ◽  
pp. 8376-8380 ◽  
Author(s):  
Yushi Tian ◽  
Xiaoxue Mei ◽  
Qing Liang ◽  
Di Wu ◽  
Nanqi Ren ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Microbial Fuel Cells ◽  
Energy Production ◽  
Alternative Energy ◽  
Biological Degradation ◽  
Potato Pulp ◽  
Degrading Bacteria

The syntrophic interactions between polysaccharide-degrading bacteria and exoelectrogens drove simultaneous alternative energy production and degradation of potato pulp waste in microbial fuel cells.

Response of the microbial community structure of biofilms to ferric iron in microbial fuel cells

2018 ◽  
Vol 631-632 ◽  
pp. 695-701 ◽  
Author(s):  
Qian Liu ◽  
Yang Yang ◽  
Xiaoxue Mei ◽  
Bingfeng Liu ◽  
Chuan Chen ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Microbial Fuel Cells ◽  
Ferric Iron

scholarly journals Efficient Removal of Butachlor and Change in Microbial Community Structure in Single-Chamber Microbial Fuel Cells

2019 ◽  
Vol 16 (20) ◽  
pp. 3897
Author(s):  
Xiaojing Li ◽  
Yue Li ◽  
Lixia Zhao ◽  
Yang Sun ◽  
Xiaolin Zhang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Community Structure ◽  
Microbial Community ◽  
Carbon Source ◽  
Microbial Community Structure ◽  
Microbial Fuel Cells ◽  
Sodium Acetate ◽  
Sole Carbon Source ◽  
High Throughput Sequencing ◽  
Single Chamber

Microbial electrochemical technology provides an inexhaustible supply of electron acceptors, allowing electroactive microorganisms to generate biocurrent and accelerate the removal of organics. The treatment of wastewater contaminated by butachlor, which is a commonly used chloroacetamide herbicide in paddy fields, is a problem in agricultural production. In this study, butachlor was found to be removed efficiently (90 ± 1%) and rapidly (one day) in constructed single-chamber microbial fuel cells (MFCs). After the addition of sodium acetate to MFCs with butachlor as the sole carbon source, electricity generation was recovered instead of increasing the degradation efficiency of butachlor. Meanwhile, the microbial community structure was changed in anodic and cathodic biofilms after the addition of butachlor, following the bioelectrochemical degradation of butachlor. High-throughput sequencing showed the proliferation of Paracoccus and Geobacter in MFCs with butachlor as the sole carbon source and of Thauera butanivorans in MFCs with butachlor and sodium acetate as concomitant carbon sources. These species possess the ability to oxidize different substituents of butachlor and have important potential use for the bioremediation of wastewater, sediments, and soils.

scholarly journals Stochastic Assembly Leads to Alternative Communities with Distinct Functions in a Bioreactor Microbial Community

mBio ◽  
2013 ◽  
Vol 4 (2) ◽  
Author(s):  
Jizhong Zhou ◽  
Wenzong Liu ◽  
Ye Deng ◽  
Yi-Huei Jiang ◽  
Kai Xue ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Diversity ◽  
Microbial Community Structure ◽  
Community Assembly ◽  
Ecosystem Functioning ◽  
Dominant Role ◽  
Microbial Biodiversity ◽  
Stochastic Assembly

ABSTRACTThe processes and mechanisms of community assembly and its relationships to community functioning are central issues in ecology. Both deterministic and stochastic factors play important roles in shaping community composition and structure, but the connection between community assembly and ecosystem functioning remains elusive, especially in microbial communities. Here, we used microbial electrolysis cell reactors as a model system to examine the roles of stochastic assembly in determining microbial community structure and functions. Under identical environmental conditions with the same source community, ecological drift (i.e., initial stochastic colonization) and subsequent biotic interactions created dramatically different communities with little overlap among 14 identical reactors, indicating that stochastic assembly played dominant roles in determining microbial community structure. Neutral community modeling analysis revealed that deterministic factors also played significant roles in shaping microbial community structure in these reactors. Most importantly, the newly formed communities differed substantially in community functions (e.g., H2production), which showed strong linkages to community structure. This study is the first to demonstrate that stochastic assembly plays a dominant role in determining not only community structure but also ecosystem functions. Elucidating the links among community assembly, biodiversity, and ecosystem functioning is critical to understanding ecosystem functioning, biodiversity preservation, and ecosystem management.IMPORTANCEMicroorganisms are the most diverse group of life known on earth. Although it is well documented that microbial natural biodiversity is extremely high, it is not clear why such high diversity is generated and maintained. Numerous studies have established the roles of niche-based deterministic factors (e.g., pH, temperature, and salt) in shaping microbial biodiversity, the importance of stochastic processes in generating microbial biodiversity is rarely appreciated. Moreover, while microorganisms mediate many ecosystem processes, the relationship between microbial diversity and ecosystem functioning remains largely elusive. Using a well-controlled laboratory system, this study provides empirical support for the dominant role of stochastic assembly in creating variations of microbial diversity and the first explicit evidence for the critical role of community assembly in influencing ecosystem functioning. The results presented in this study represent important contributions to the understanding of the mechanisms, especially stochastic processes, involved in shaping microbial biodiversity.

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