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https://read.qxmd.com/read/30901649/enhancement-of-the-denitrification-activity-by-exoelectrogens-in-single-chamber-air-cathode-microbial-fuel-cells
#1
Haobin Huang, Shaoan Cheng, Fujian Li, Zhengzhong Mao, Zhufan Lin, Kefa Cen
Single-chamber microbial fuel cells (MFCs) can efficiently treat wastewater containing nitrate, probably because the interaction between exoelectrogens and denitrifying bacteria may enhance the denitrification activity of MFCs. In this study, the denitrification of nitrate with a wide range of concentrations was investigated by using single-chamber air cathode MFCs. The maximum average denitrification rate of the MFCs inoculated and operated under closed-circuit conditions (Group N-CC) was up to 12.2 ± 0...
March 11, 2019: Chemosphere
https://read.qxmd.com/read/30901585/reduced-graphene-oxide-and-biofilms-as-cathode-catalysts-to-enhance-energy-and-metal-recovery-in-microbial-fuel-cell
#2
Yining Wu, Ling Wang, Min Jin, Fanying Kong, Hong Qi, Jun Nan
In this study, reduced graphene oxide (rGO) was developed and employed as cathode catalyst in a membrane-less microbial fuel cell (MFC) to improve energy and metal (copper) recovery in combined with biofilms. Results showed that rGO-based cathode exhibited better characterizations in structure and electron transfer than graphene oxide (GO)-based cathode. The voltage with rGO was about 67% increased, and Cu2+ removal efficiency was 43% improved as compared to GO. Cu species on cathode demonstrated the favorable Cu2+ reduction to Cu with the catalysis of rGO...
March 16, 2019: Bioresource Technology
https://read.qxmd.com/read/30897710/plant-microbial-fuel-cells%C3%A2-based-energy-harvester-system-for-self-powered-iot-applications
#3
Edith Osorio de la Rosa, Javier Vázquez Castillo, Mario Carmona Campos, Gliserio Romeli Barbosa Pool, Guillermo Becerra Nuñez, Alejandro Castillo Atoche, Jaime Ortegón Aguilar
The emergence of modern technologies, such as Wireless Sensor Networks (WSNs), the Internet-of-Things (IoT), and Machine-to-Machine (M2M) communications, involves the use of batteries, which pose a serious environmental risk, with billions of batteries disposed of every year. However, the combination of sensors and wireless communication devices is extremely power-hungry. Energy Harvesting (EH) is fundamental in enabling the use of low-power electronic devices that derive their energy from external sources, such as Microbial Fuel Cells (MFC), solar power, thermal and kinetic energy, among others...
March 20, 2019: Sensors
https://read.qxmd.com/read/30889309/a-comprehensive-time-course-metabolite-profiling-of-the-model-cyanobacterium-synechocystis-sp-pcc-6803-under-diurnal-light-dark-cycles
#4
Allison Werner, Corey D Broeckling, Ashok Prasad, Christie A M Peebles
Cyanobacteria are a model photoautotroph and a chassis for the sustainable production of fuels and chemicals. Yet, knowledge of photoautotrophic metabolism in the natural environment of day/night cycles is lacking yet has implications for improved yield from plants, algae, and cyanobacteria. Here, a thorough approach to characterizing diverse metabolites-including carbohydrates, lipids, amino acids, pigments, co-factors, nucleic acids and polysaccharides-in the model cyanobacterium Synechocystis sp. PCC 6803 (S...
March 19, 2019: Plant Journal: for Cell and Molecular Biology
https://read.qxmd.com/read/30878936/sustainable-synthesis-of-novel-carbon-microwires-for-the-modification-of-a-ti-mesh-anode-in-bioelectrochemical-systems
#5
Xian-Bin Ying, Hua-Jun Feng, Dong-Sheng Shen, Mei-Zhen Wang, Ying-Feng Xu, Ting Chen, Yin Zhu
Herein, an effective method was developed to integrate carbon microwires on Ti mesh (denoted as CM/TiM) to fabricate high-performance anodes with long-time stability in microbial fuel cell. CM/TiM was synthesized by colonizing filamentous fungi on the bread modified Ti mesh followed by carbonization, which could convert the attached mycelium into carbon microwires (denoted as CM). Benefiting from the biocompatibility and 3D interlaced structure of carbon microwires, the biomass accumulation (1027 ± 83 μg cm-2 ) of CM/TiM have been significantly improved nearly 3 folds, thus the fabricated CM/TiM demonstrated 2-fold higher current density (12...
March 9, 2019: Science of the Total Environment
https://read.qxmd.com/read/30872803/physiological-adaptations-to-serpentinization-in-the-samail-ophiolite-oman
#6
Elizabeth M Fones, Daniel R Colman, Emily A Kraus, Daniel B Nothaft, Saroj Poudel, Kaitlin R Rempfert, John R Spear, Alexis S Templeton, Eric S Boyd
Hydration of ultramafic rock during the geologic process of serpentinization can generate reduced substrates that microorganisms may use to fuel their carbon and energy metabolisms. However, serpentinizing environments also place multiple constraints on microbial life by generating highly reduced hyperalkaline waters that are limited in dissolved inorganic carbon. To better understand how microbial life persists under these conditions, we performed geochemical measurements on waters from a serpentinizing environment and subjected planktonic microbial cells to metagenomic and physiological analyses...
March 12, 2019: ISME Journal
https://read.qxmd.com/read/30867679/deciphering-optimal-biostimulation-strategy-of-supplementing-anthocyanin-abundant-plant-extracts-for-bioelectricity-extraction-in-microbial-fuel-cells
#7
Bin Xu, John Chiwei Lan, Qingjiang Sun, Chungchuan Hsueh, Bor-Yann Chen
Background: Microbial fuel cells (MFCs) are effective biofuel devices that use indigenous microbes to directly convert chemical energy from organics oxidation into bioelectric energy. To maximize energy-converting efficiency for bioelectricity generation in MFCs, redox mediators (RMs) (e.g., extracts obtained from plant resource- Camellia green tea) have been explored for optimal stimulation upon electron transfer (ET) capabilities. Anthocyanins are natural antioxidants widely used in food science and medicinal industry...
2019: Biotechnology for Biofuels
https://read.qxmd.com/read/30867542/metatranscriptomic-exploration-of-microbial-functioning-in-clouds
#8
Pierre Amato, Ludovic Besaury, Muriel Joly, Benjamin Penaud, Laurent Deguillaume, Anne-Marie Delort
Clouds constitute the uppermost layer of the biosphere. They host diverse communities whose functioning remains obscure, although biological activity potentially participates to atmospheric chemical and physical processes. In order to gain information on the metabolic functioning of microbial communities in clouds, we conducted coordinated metagenomics/metatranscriptomics profiling of cloud water microbial communities. Samples were collected from a high altitude atmospheric station in France and examined for biological content after untargeted amplification of nucleic acids...
March 13, 2019: Scientific Reports
https://read.qxmd.com/read/30865693/divergent-microbial-communities-in-groundwater-and-overlying-soils-exhibit-functional-redundancy-for-plant-polysaccharide-degradation
#9
Martin Taubert, Jan Stähly, Steffen Kolb, Kirsten Küsel
Light driven primary production by plants is the main source of biomass in terrestrial ecosystems. But also in subsurface habitats like aquifers, life is fueled largely by this plant-derived biomass. Here, we investigate the degradation of plant-derived polysaccharides in a groundwater microbiome to identify the microbial key players involved, and compare them to those from soil of the groundwater recharge area. We quantified the activities of enzymes degrading the abundant plant polymers starch, cellulose and hemicellulose in oligotrophic groundwater samples, despite the low cell numbers present...
2019: PloS One
https://read.qxmd.com/read/30853877/a-new-method-for-modulation-control-and-power-boosting-in-microbial-fuel-cells
#10
I A Ieropoulos, J You, I Gajda, J Greenman
Microbial fuel cells (MFCs) are energy transducers, which through the metabolic reactions of facultative anaerobic microorganisms, transform the energy in organic matter directly into electricity. Extrinsic parameters such as hydraulic retention time, fuel quality (type and concentration) and physicochemical environment of electrodes and biofilms (e.g., temperature, pH, salinity, and redox), can all influence system efficiency. This work proposes that MFCs can be "fine-tuned" by adjustment of any of the physicochemical conditions including redox potential; in this context, an entirely novel method was investigated as a practical means of tuning, modulating and monitoring the redox potential within the electrode chambers...
October 2018: Fuel Cells (Weinheim)
https://read.qxmd.com/read/30852733/bioelectricity-generation-by-wetland-plant-sediment-microbial-fuel-cells-p-smfc-and-effects-on-the-transformation-and-mobility-of-arsenic-and-heavy-metals-in-sediment
#11
Juanping Zhu, Taiping Zhang, Nengwu Zhu, Chunhua Feng, Shaoqi Zhou, Randy A Dahlgren
Two wetland plant-sediment microbial fuel cell systems (PSM1 and PSM2) and one wetland sediment microbial fuel cell system (SM) were constructed to investigate their electricity production performance and the simultaneous migration and transformation of arsenic and heavy metals in sediment and overlying water, arsenic and heavy metals uptake by plants. The bioelectricity generation was monitored for 175 days, and sediment samples were collected at three time points (64, 125 and 200 days) for the analysis...
March 9, 2019: Environmental Geochemistry and Health
https://read.qxmd.com/read/30846876/electroactive-microorganisms-in-bioelectrochemical-systems
#12
REVIEW
Bruce E Logan, Ruggero Rossi, Ala'a Ragab, Pascal E Saikaly
A vast array of microorganisms from all three domains of life can produce electrical current and transfer electrons to the anodes of different types of bioelectrochemical systems. These exoelectrogens are typically iron-reducing bacteria, such as Geobacter sulfurreducens, that produce high power densities at moderate temperatures. With the right media and growth conditions, many other microorganisms ranging from common yeasts to extremophiles such as hyperthermophilic archaea can also generate high current densities...
March 7, 2019: Nature Reviews. Microbiology
https://read.qxmd.com/read/30839675/effect-of-fermentation-stillage-of-food-waste-on-bioelectricity-production-and-microbial-community-structure-in-microbial-fuel-cells
#13
Hongzhi Ma, Cheng Peng, Yan Jia, Qunhui Wang, Maobing Tu, Ming Gao
A single-chamber microbial fuel cell (MFC) was used in this study to treat recycled stillage obtained from food waste ethanol fermentation. Corresponding substrates inside the system were evaluated by fluorescence spectra, and microbial communities were also investigated. Results demonstrated that output voltage and current, respectively, reached 0.29 V and 1.4 mA with an external resistance of 200 Ω. Corresponding total organic carbon and chemical oxygen demand removal efficiency reached more than 50% and 70%, respectively...
September 2018: Royal Society Open Science
https://read.qxmd.com/read/30822639/inhibition-of-methanogens-decreased-sulfadiazine-removal-and-increased-antibiotic-resistance-gene-development-in-microbial-fuel-cells
#14
Shuai Zhang, Hai-Liang Song, Xian Cao, Hua Li, Jianhua Guo, Xiao-Li Yang, Rajendra Prasad Singh, Shuai Liu
The aim of this work was to study sulfadiazine (SDZ) biodegradation efficiency, antibiotic resistance genes (ARGs) development and shift of microbial communities under conditions of limited methanogens activity in Microbial fuel cells (MFCs). The results indicated that the removal performance of SDZ was decreased with the suppression of methanogens in both MFCs and open-circuit controls. The relative abundances of ARGs were even enhanced by the inhibition of methanogens. The biodegradation mechanism of SDZ was obtained, in which SDZ was initially divided into aniline and pyrimidin-2ylsulfamic acid, then converted into small molecules...
February 20, 2019: Bioresource Technology
https://read.qxmd.com/read/30818210/hierarchically-structured-carbon-materials-derived-from-lotus-leaves-as-efficient-electrocatalyst-for-microbial-energy-harvesting
#15
Wenyuan Ye, Jiahuan Tang, Yajun Wang, Xixi Cai, Hongwei Liu, Jiuyang Lin, Bart Van der Bruggen, Shungui Zhou
Developing a highly efficient, cost-effective, easily scalable and sustainable cathode for oxygen reduction reaction (ORR) is a crucial challenge in terms of future "green" energy conversion technologies, e.g., microbial fuel cells (MFCs). In this study, a natural and widely available lotus leaf with intrinsically hierarchical structure was employed to serve as the single precursor to prepare the catalyst applied as the MFC cathode. The hierarchically particle-coated bio‑carbon was self-constructed from the lotus leaf, which yielded a large specific surface area, highly porous structure and superhydrophobicity via facile pyrolysis coupling hydrothermal activation by ZnCl2 /(NH4 )2 SO4 ...
February 21, 2019: Science of the Total Environment
https://read.qxmd.com/read/30818194/performance-of-trickling-bed-microbial-fuel-cell-treating-isopropyl-alcohol-vapor-effects-of-shock-load-and-shut-down-episodes
#16
Shu-Hui Liu, Hsin-Hui Lin, Shin Wen, Chi-Wen Lin
This work investigates the enhancement in the removal efficiency of isopropyl alcohol (IPA) vapor by a hollow trickling-bed microbial fuel cell (TB-MFC) that can be achieved by certain modifications. The effects of shock load and shutdown on the performance of TB-MFC were evaluated. When organic loading (OL) of IPA was approximately 22.1-88.5 g m-3 h-1 , the removal efficiency of 85.1-93.8% of the TB-MFC was achieved. With an empty bed residence time (EBRT) of 60 s and an inlet IPA concentration of 4...
February 23, 2019: Chemosphere
https://read.qxmd.com/read/30810037/evaluation-of-electrode-and-solution-area-based-resistances-enables-quantitative-comparisons-of-factors-impacting-microbial-fuel-cell-performance
#17
Ruggero Rossi, Benjamin P Cario, Carlo Santoro, Wulin Yang, Pascal E Saikaly, Bruce E Logan
Direct comparisons of microbial fuel cells (MFCs) based on maximum power densities are hindered by different reactor and electrode sizes, solution conductivities, and materials. We propose an alternative method here, the electrode potential slope (EPS) analysis, to enable quantitative comparisons based on anode and cathode area-based resistances and operating potentials. Using the EPS analysis, the brush anode resistance (RAn= 10.6 ± 0.5 mΩ m2) was shown to be 28% less than the resistance of a 70% porosity diffusion layer (70% DL) cathode (Rcat = 14...
February 27, 2019: Environmental Science & Technology
https://read.qxmd.com/read/30805299/monitoring-microbial-communities-dynamics-during-the-start-up-of-microbial-fuel-cells-by-high-throughput-screening-techniques
#18
Tommy Pepè Sciarria, Stefania Arioli, Giorgio Gargari, Diego Mora, Fabrizio Adani
Microbial Electrochemical Technologies are based on the use of electrochemically active microorganisms that can carry out extracellular electron transfer to an electrode while they are oxidizing the organic compounds. The dynamics and changes of the bacterial community in the anode biofilm and planktonic broth of an acetate fed batch single chamber air cathode MFC have been studied by combing flow-cytometry and Illumina sequencing techniques. At the beginning of the test, from 0 h to 70 h, microbial planktonic communities changed from four groups to two groups, as revealed by DNA content, and from three groups to one group based on the cell membrane polarization revealed by a DiOC6 (3) probe...
March 2019: Biotechnology Reports
https://read.qxmd.com/read/30802667/conversion-of-sewage-sludge-into-environmental-catalyst-and-microbial-fuel-cell-electrode-material-a-review
#19
REVIEW
Md Manik Mian, Guijian Liu, Biao Fu
At present, environmentally friendly and cost-effective disposal of sewage sludge (SS) is the major challenge of wastewater treatment that prompted the concept of sludge valorization. A recent technology, SS conversion into biochar as an efficient catalyst for environmental application, shows great promise to sludge valorization. This review presents the literature and advances of sludge biochar-based catalysts (SBCs), including their synthesis route, physiochemical characteristics, catalytic applications, reaction mechanisms, chemical stability, feasibility, and future aspects...
February 17, 2019: Science of the Total Environment
https://read.qxmd.com/read/30801606/the-bioelectrochemical-synthesis-of-high-quality-carbon-dots-with-strengthened-electricity-output-and-excellent-catalytic-performance
#20
Libin Zeng, Xinyong Li, Shiying Fan, Jianan Li, Jincheng Mu, Meichun Qin, Liang Wang, Guoqiang Gan, Moses Tadé, Shaomin Liu
The emergence of microbial fuel cell (MFC) technology that can effectively recycle renewable energy from organic pollutants has been regarded as a promising and environmentally friendly route that could be widely used in numerous fields. Here, a novel sustainable self-energy conversion system was successfully constructed to renewably synthesize carbon dots (CDs) via in situ coupling with a MFC system. Interestingly, the generation of CDs was found to largely enhance the electricity production performance of the MFC...
February 25, 2019: Nanoscale
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