Organic content influences sediment microbial fuel cell performance and community structure

Zhao, Qian; Li, Ruying; Ji, Min; Ren, Zhiyong Jason

doi:10.1016/j.biortech.2016.09.005

Cited by 73 publications

(25 citation statements)

References 33 publications

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“…This study found that MC, pH, and P N were the most important factors affecting the microbial community and structure in the region ( Figure 6 b). The corresponding conclusions from previous studies have also shown that the microbial community in the soil is formed by the combined effects of environmental factors and heavy metal pollution in the soil [ 56 , 57 ].…”

Section: Discussionmentioning

confidence: 82%

Ecological Effects of Heavy Metal Pollution on Soil Microbial Community Structure and Diversity on Both Sides of a River around a Mining Area

Zhao

Huang

Zhu

et al. 2020

IJERPH

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The objectives of this study were to understand the characteristics of heavy metal pollution caused by mining activities on the two sides of the Shun’an river and the response of soil microorganisms to the habitats by different contamination levels and vegetation. This paper selected soil samples from the banks of the Shun’an River near the Shizishan mining area, which is at the left of the river, in Tongling, Anhui Province, China. Using Illumina MiSeq 2500 technology, we analyzed the relationship between environmental factors and microbial communities. As the distance from the mining area increased, the heavy metal comprehensive pollution and potential risk value decreased. Additionally, the pollution severity and risk value of the left bank, where the mining area lies, were generally higher than those of the right bank. Because the symmetric sampling points on both banks of the river had similar planting types, their environmental factors and microbial community structure were similar and clustered. However, under different vegetation, the paddy soils tended to have a higher nutrient content and community richness and diversity than the vegetable fields or the abandoned land. It was found that soil microbial communities in this area were mostly affected by pH and Nemerow pollution index (PN). The pH significantly affected the abundance and structure of most microorganisms. In addition, Proteobacteria, Acidobacteria, and Bacteroidetes had significant tolerance to Zn, Pb, and Cd. By exploring the potential use of these tolerant microorganisms, we seek to provide strains and the theoretical basis for the bioremediation of areas contaminated by heavy metal.

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Section: Discussionmentioning

confidence: 82%

Ecological Effects of Heavy Metal Pollution on Soil Microbial Community Structure and Diversity on Both Sides of a River around a Mining Area

Zhao

Huang

Zhu

et al. 2020

IJERPH

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“…Couples of research analyzed the microbial community structure of anodic biofilm in SMFCs [18,19], while few research paid attentions to the influences of burial depth of anode on microbial diversity.…”

Section: -mentioning

confidence: 99%

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

et al. 2019

Environmental Engineering Research

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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.

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“…There were many worms in the sediment because of the sediment's high organic matter content [33]. The actions of the worms could strengthen the transfer rate of organic matters around the electrode, which would further influence the voltage output of the self-powered systems [34]. Furthermore, the instability in the self-powered systems could result in fluctuations in the Cr(VI) and nitrate removal rates.…”

Section: (Ch O) + N H O + N E → N Co + 4n H + 4n Ementioning

confidence: 99%

Construction of a Self-Powered System for Simultaneous In Situ Remediation of Nitrate and Cr(VI) Contaminated Synthetic Groundwater and River Sediment

Han

et al. 2018

Sustainability

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A novel self-powered system was constructed to in situ remove nitrate and Cr(VI) from synthetic groundwater and achieve river sediment remediation simultaneously. The sediment organic matter in an anodic chamber was used as a carbon source to provide self-powered energy to reduce the cathode's contaminants. With the acceptance of protons and electrons, nitrate and Cr(VI) were transformed into nitrite and Cr(III), respectively. In a 72 h test with both nitrate and Cr(VI) present, nitrate was removed at a rate of 70.96 mg/m 3 ·h and Cr(VI) at a rate of 8.95 mg/m 3 ·h. When a phosphate buffer was used in the test, their removal rates were changed to 140.83 mg/m 3 ·h and 8.33 mg/m 3 ·h, respectively. The results showed that the self-powered system could achieve the simultaneous reduction of nitrate and Cr(VI), although the presence of Cr(VI) hindered nitrate reduction. This system could realize simultaneous in situ groundwater and sediment remediation, with no need for additional energy or materials. nitrate and Cr(VI) coexisting in groundwater using 3-dimensional bio-electrochemical systems (BES) has been achieved, but it still needs applied potentials [16].Aquatic sediment acts as a repository for multiple pollutants in rivers and lakes, and as a significant source of internal pollutants. Pollutants include organic matter, metal contaminants, and inorganic salts [17][18][19]. Organic substances play an important role in the deterioration of water quality because when it catabolized, the dissolved oxygen in water consumed, thus results in an anoxic or anaerobic condition of water. Conditions, such as water disturbances and temperature/pH changes can lead to contaminants being released from the sediments [20].Many strategies have been proposed for the remediation of sediments. Although ex situ remediation methods, such as dredging and dry excavation can control the release of pollutants, these methods are harmful to the water environment and are also a waste of resources [19,21]. Since there are large quantities of organic matter in the sediments [22,23], with the use of sediment as a carbon source in sediment microbial fuel cells systems (sMFC) [24,25], the organic matter can be used as a carbon source, as well as an energy source for microorganisms to reduce other contaminants. To our best knowledge, the research of simultaneous treatment of contaminated groundwater and the remediation of sediment achieved without inputting additional energy and materials, has not been reported yet.In this study, a self-powered system was constructed for the in situ removal of nitrate and Cr(VI) from synthetic groundwater, and the remediation of sediment simultaneously. Using Ti wire and proton exchanger, for the connection of river sediment rich in organic matter and the nearby nitrate and Cr(VI) contaminated groundwater for their simultaneous remediation. The system was half biotic: the aquatic sediment on the anode side contained electro-active organisms, whilst the cathode side was abiotic. The aquatic sediment was used as an e...

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Organic content influences sediment microbial fuel cell performance and community structure

Cited by 73 publications

References 33 publications

Ecological Effects of Heavy Metal Pollution on Soil Microbial Community Structure and Diversity on Both Sides of a River around a Mining Area

Ecological Effects of Heavy Metal Pollution on Soil Microbial Community Structure and Diversity on Both Sides of a River around a Mining Area

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

Construction of a Self-Powered System for Simultaneous In Situ Remediation of Nitrate and Cr(VI) Contaminated Synthetic Groundwater and River Sediment

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