Journal articles: 'Bioelectrochemical processes'

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Perazzoli, Simone, José P. de Santana Neto, and Hugo M. Soares. "Prospects in bioelectrochemical technologies for wastewater treatment." Water Science and Technology 78, no. 6 (September 25, 2018): 1237–48. http://dx.doi.org/10.2166/wst.2018.410.

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Abstract Bioelectrochemical technologies are emerging as innovative solutions for waste treatment, offering flexible platforms for both oxidation and reduction reaction processes. A great variety of applications have been developed by utilizing the energy produced in bioelectrochemical systems, such as direct electric power generation, chemical production or water desalination. This manuscript provides a literature review on the prospects in bioelectrochemical technologies for wastewater treatment, including organic, nutrients and metals removal, production of chemical compounds and desalination. The challenges and perspectives for scale-up were discussed. A technological strategy to improve the process monitoring and control based on big data platforms is also presented. To translate the viability of wastewater treatment based on bioelectrochemical technologies into commercial application, it is necessary to exploit interdisciplinary areas by combining the water/wastewater sector, energy and data analytics technologies.

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Molognoni, Daniele, Stefania Chiarolla, Daniele Cecconet, Arianna Callegari, and Andrea G. Capodaglio. "Industrial wastewater treatment with a bioelectrochemical process: assessment of depuration efficiency and energy production." Water Science and Technology 77, no. 1 (October 16, 2017): 134–44. http://dx.doi.org/10.2166/wst.2017.532.

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Abstract Development of renewable energy sources, efficient industrial processes, energy/chemicals recovery from wastes are research issues that are quite contemporary. Bioelectrochemical processes represent an eco-innovative technology for energy and resources recovery from both domestic and industrial wastewaters. The current study was conducted to: (i) assess bioelectrochemical treatability of industrial (dairy) wastewater by microbial fuel cells (MFCs); (ii) determine the effects of the applied organic loading rate (OLR) on MFC performance; (iii) identify factors responsible for reactor energy recovery losses (i.e. overpotentials). For this purpose, an MFC was built and continuously operated for 72 days, during which the anodic chamber was fed with dairy wastewater and the cathodic chamber with an aerated mineral solution. The study demonstrated that industrial effluents from agrifood facilities can be treated by bioelectrochemical systems (BESs) with >85% (average) organic matter removal, recovering power at an observed maximum density of 27 W m−3. Outcomes were better than in previous (shorter) analogous experiences, and demonstrate that this type of process could be successfully used for dairy wastewater with several advantages.

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Thundat, T., L. A. Nagahara, P. Oden, and S. M. Lindsay. "Direct observation of bioelectrochemical processes by scanning tunneling microscopy." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 8, no. 1 (January 1990): 645–47. http://dx.doi.org/10.1116/1.576363.

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Seiger, Harvey N. "The Confluence of Faraday's and Kirchoff's Laws in Bioelectrochemical Systems." Scientific World Journal 2012 (2012): 1–3. http://dx.doi.org/10.1100/2012/838756.

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When external measurements are made of electrochemical systems, including bioelectrochemical, there results an interaction. Such measurements cause electrochemical processes to take place that are significant. This work looks into the nature and significance of the interfacial processes on membrane and membrane phenomena. The conclusion reached is that interfacial processes are important and cannot be overlooked.

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Nicolau, Eduardo, José J. Fonseca, José A. Rodríguez-Martínez, Tra-My Justine Richardson, Michael Flynn, Kai Griebenow, and Carlos R. Cabrera. "Evaluation of a Urea Bioelectrochemical System for Wastewater Treatment Processes." ACS Sustainable Chemistry & Engineering 2, no. 4 (March 21, 2014): 749–54. http://dx.doi.org/10.1021/sc400342x.

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Li, Yan, Zhiheng Xu, Dingyi Cai, Brandon Holland, and Baikun Li. "Self-sustained high-rate anammox: from biological to bioelectrochemical processes." Environmental Science: Water Research & Technology 2, no. 6 (2016): 1022–31. http://dx.doi.org/10.1039/c6ew00151c.

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Sun, Jin, Hongrui Cao, and Zejie Wang. "Progress in Nitrogen Removal in Bioelectrochemical Systems." Processes 8, no. 7 (July 13, 2020): 831. http://dx.doi.org/10.3390/pr8070831.

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Nitrogenous compounds attract great attention because of their environmental impact and harmfulness to the health of human beings. Various biological technologies have been developed to reduce the environmental risks of nitrogenous pollutants. Bioelectrochemical systems (BESs) are considered to be a novel biological technology for removing nitrogenous contaminants by virtue of their advantages, such as low energy requirement and capacity for treating wastewaters with a low C/N ratio. Therefore, increasing attention has been given to carry out biological processes related to nitrogen removal with the aid of cathodic biofilms in BESs. Prior studies have evaluated the feasibility of conventional biological processes including nitrification, denitrification, and anaerobic ammonia oxidation (anammox), separately or combined together, to remove nitrogenous compounds with the help of BESs. The present review summarizes the progress of developments in BESs in terms of the biological process, cathodic biofilm, and affecting factors for efficient nitrogen removal.

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Modin, Oskar, and David J. I. Gustavsson. "Opportunities for microbial electrochemistry in municipal wastewater treatment – an overview." Water Science and Technology 69, no. 7 (January 30, 2014): 1359–72. http://dx.doi.org/10.2166/wst.2014.052.

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Microbial bioelectrochemical systems (BESs) utilize living microorganisms to drive oxidation and reduction reactions at solid electrodes. BESs could potentially be used at municipal wastewater treatment plants (WWTPs) to recover the energy content of organic matter, to produce chemicals useful at the site, or to monitor and control biological treatment processes. In this paper, we review bioelectrochemical technologies that could be applied for municipal wastewater treatment. Sjölunda WWTP in Malmö, Sweden, is used as an example to illustrate how the different technologies potentially could be integrated into an existing treatment plant and the impact they could have on the plant's utilization of energy and chemicals.

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Politaeva, Natalia, Rostislav Rusinov, Yurii Karyakin, Boris Fokin, and Konstantin Grigoryev. "Impact of magnetic field on electrochemistry of heavy metals removal processes by duckweed (lemna)." E3S Web of Conferences 91 (2019): 01004. http://dx.doi.org/10.1051/e3sconf/20199101004.

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The influence of various factors (initial concentration of the solution, contact time of the biosorbent with the solution, and the action of a constant parallel magnetic field of intensity 4 kA/m (50 Oe)) on the processes of extraction of heavy metal ions (Zn, Cd, Cu) from wastewater with the help of bioelectrochemical reactor - duckweed is in the focus of this study.

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Nelabhotla, Anirudh, and Carlos Dinamarca. "Bioelectrochemical CO2 Reduction to Methane: MES Integration in Biogas Production Processes." Applied Sciences 9, no. 6 (March 13, 2019): 1056. http://dx.doi.org/10.3390/app9061056.

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Anaerobic digestion (AD) is a widely used technique to treat organic waste and produce biogas. This article presents a practical approach to increase biogas yield of an AD system using a microbial electrosynthesis system (MES). The biocathode in MES reduces carbon dioxide with the supplied electrons and protons (H+) to form methane. We demonstrate that the MES is able to produce biogas with over 90% methane when fed with reject water obtained from a local wastewater treatment plant. The optimised cathode potential was observed in the range of −0.70 V to −0.60 V and optimised feed pH was around 7.0. With autoclaved feed, these conditions allowed methane yields of about 9.05 mmol/L(reactor)-day. A control experiment was then carried out to make a comparison between open circuit and MES methanogenesis. The highest methane yield of about 22.1 mmol/L(reactor)-day was obtained during MES operation that performed 10–15% better than the open circuit mode of operation. We suggest and describe an integrated AD-MES system, by installing MES in the reject water loop, as a novel approach to improve the efficiency and productivity of existing waste/wastewater treatment plants.

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Nagendranatha Reddy, C., Sanath Kondaveeti, Gunda Mohanakrishna, and Booki Min. "Application of bioelectrochemical systems to regulate and accelerate the anaerobic digestion processes." Chemosphere 287 (January 2022): 132299. http://dx.doi.org/10.1016/j.chemosphere.2021.132299.

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Zhao, Xueyan, Xin Lu, William T. Y. Tze, and Ping Wang. "A single carbon fiber microelectrode with branching carbon nanotubes for bioelectrochemical processes." Biosensors and Bioelectronics 25, no. 10 (June 2010): 2343–50. http://dx.doi.org/10.1016/j.bios.2010.03.030.

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Enzmann, Franziska, Florian Mayer, Markus Stöckl, Klaus-Michael Mangold, Rolf Hommel, and Dirk Holtmann. "Transferring bioelectrochemical processes from H-cells to a scalable bubble column reactor." Chemical Engineering Science 193 (January 2019): 133–43. http://dx.doi.org/10.1016/j.ces.2018.08.056.

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Kuleshova T.E., Panova G.G., Gall N.R., and Galushko A.S. "Concentration cell based on electrogenic processes in the root environment." Technical Physics Letters 48, no. 4 (2022): 66. http://dx.doi.org/10.21883/tpl.2022.04.53176.19066.

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The experimental bioelectrochemical current source based on the concentration gradient of charge carriers in the root environment of plants has been created. A potential difference of about 70 mV is observed in the nutrient solution. It is gradually decreasing due to equalization of concentrations. The voltage increases to 200 mV when plant are placed in a cultivation system as the root system develops due to the intensification of diffusion processes. The potential-forming role of nitrate forms of nitrogen is shown on the example of lettuce grown according to the panoponics technology. The separation of electrical charges by the root system during the life of plants can become an alternative source of green energy. Keywords: rhizosphere, bioelectric potential, panoponics, green energy.

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Paul, Diplina, and Abhisek Banerjee. "Technologies for Biological and Bioelectrochemical Removal of Inorganic Nitrogen from Wastewater: A Review." Nitrogen 3, no. 2 (May 14, 2022): 298–313. http://dx.doi.org/10.3390/nitrogen3020020.

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Water contamination due to various nitrogenous pollutants generated from wastewater treatment plants is a crucial and ubiquitous environmental problem now-a-days. Nitrogen contaminated water has manifold detrimental effects on human health as well as aquatic life. Consequently, various biological treatment processes are employed to transform the undesirable forms of nitrogen in wastewater to safer ones for subsequent discharge. In this review, an overview of various conventional biological treatment processes (viz. nitrification, denitrification, and anammox) have been presented along with recent novel bioelectrochemical methods (viz. microbial fuel cells and microbial electrolysis cells). Additionally, nitrogen is an indispensable nutrient necessary to produce artificial fertilizers by fixing dinitrogen gas from the atmosphere. Thus, this study also explored the potential capability of various nitrogen recovery processes from wastewater (like microalgae, cyanobacteria, struvite precipitation, stripping, and zeolites) that are used in industries. Further, the trade-offs, challenges posed by these processes have been dwelt on along with other biological processes like CANON, SHARON, OLAND, and others.

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Zeppilli, Marco, Paola Paiano, Cesar Torres, and Deepak Pant. "A critical evaluation of the pH split and associated effects in bioelectrochemical processes." Chemical Engineering Journal 422 (October 2021): 130155. http://dx.doi.org/10.1016/j.cej.2021.130155.

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Yang, Kaichao, Yingxin Zhao, Min Ji, Zhiling Li, Siyuan Zhai, Xu Zhou, Qian Wang, Can Wang, and Bin Liang. "Challenges and opportunities for the biodegradation of chlorophenols: Aerobic, anaerobic and bioelectrochemical processes." Water Research 193 (April 2021): 116862. http://dx.doi.org/10.1016/j.watres.2021.116862.

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Chandrasekhar, K., Tirath Raj, S. V. Ramanaiah, Gopalakrishnan Kumar, Byong-Hun Jeon, Min Jang, and Sang-Hyoun Kim. "Regulation and augmentation of anaerobic digestion processes via the use of bioelectrochemical systems." Bioresource Technology 346 (February 2022): 126628. http://dx.doi.org/10.1016/j.biortech.2021.126628.

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19

Capodaglio, Andrea, Daniele Cecconet, and Daniele Molognoni. "An Integrated Mathematical Model of Microbial Fuel Cell Processes: Bioelectrochemical and Microbiologic Aspects." Processes 5, no. 4 (November 20, 2017): 73. http://dx.doi.org/10.3390/pr5040073.

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Mauzeroll, Janine. "Neurologically Relevant Enzyme Expression and Engineering for D-Amino Acid Enzymatic Electrochemical Biosensor Development." ECS Meeting Abstracts MA2019-02, no. 55 (September 1, 2019): 2428. http://dx.doi.org/10.1149/ma2019-02/55/2428.

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Our interest lies in using enzymes to develop biosensors to be employed in studying neurochemical processes occurring in the brain. We will discuss expression and characterization of three different wild type enzymes and their mutants (Glycine oxidase, D-aspartate oxidase, D-amino acid oxidase). Enzyme expression and purification will be completed through standard biochemistry techniques while activity characterization will be assessed using spectrophotometric assays. Upon expression and characterization, these enzymes will then be used to develop enzymatic bioelectrochemical sensors which will be employed for in vitro single cell and in-vivo animal model studies of neurochemical processes.

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Yang, Kai, and Mohan Qin. "The Application of Cation Exchange Membranes in Electrochemical Systems for Ammonia Recovery from Wastewater." Membranes 11, no. 7 (June 30, 2021): 494. http://dx.doi.org/10.3390/membranes11070494.

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Electrochemical processes are considered promising technologies for ammonia recovery from wastewater. In electrochemical processes, cation exchange membrane (CEM), which is applied to separate compartments, plays a crucial role in the separation of ammonium nitrogen from wastewater. Here we provide a comprehensive review on the application of CEM in electrochemical systems for ammonia recovery from wastewater. Four kinds of electrochemical systems, including bioelectrochemical systems, electrochemical stripping, membrane electrosorption, and electrodialysis, are introduced. Then we discuss the role CEM plays in these processes for ammonia recovery from wastewater. In addition, we highlight the key performance metrics related to ammonia recovery and properties of CEM membrane. The limitations and key challenges of using CEM for ammonia recovery are also identified and discussed.

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Wang, Haiyan, and Jiuhui Qu. "Comparison of Two Combined Bioelectrochemical and Sulfur Autotrophic Denitrification Processes for Drinking Water Treatment." Journal of Environmental Science and Health, Part A 38, no. 7 (July 2003): 1269–84. http://dx.doi.org/10.1081/ese-120021125.

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Espinoza-Tofalos, Anna, Matteo Daghio, Enza Palma, Federico Aulenta, and Andrea Franzetti. "Structure and Functions of Hydrocarbon-Degrading Microbial Communities in Bioelectrochemical Systems." Water 12, no. 2 (January 25, 2020): 343. http://dx.doi.org/10.3390/w12020343.

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Bioelectrochemical systems (BESs) exploit the interaction between microbes and electrodes. A field of application thereof is bioelectrochemical remediation, an effective strategy in environments where the absence of suitable electron acceptors limits classic bioremediation approaches. Understanding the microbial community structure and genetic potential of anode biofilms is of great interest to interpret the mechanisms occurring in BESs. In this study, by using a whole metagenome sequencing approach, taxonomic and functional diversity patterns in the inoculum and on the anodes of three continuous-flow BES for the removal of phenol, toluene, and BTEX were obtained. The genus Geobacter was highly enriched on the anodes and two reconstructed genomes were taxonomically related to the Geobacteraceae family. To functionally characterize the microbial community, the genes coding for the anaerobic degradation of toluene, ethylbenzene, and phenol were selected as genetic markers for the anaerobic degradation of the pollutants. The genes related with direct extracellular electron transfer (EET) were also analyzed. The inoculum carried the genetic baggage for the degradation of aromatics but lacked the capacity of EET while anodic bacterial communities were able to pursue both processes. The metagenomic approach provided useful insights into the ecology and complex functions within hydrocarbon-degrading electrogenic biofilms.

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Cliffel, David E., Christopher Stachurski, and John Williams. "Carbon Nanomaterials Interfaced to Photosystem I for Bioelectrochemical Energy." ECS Meeting Abstracts MA2022-02, no. 54 (October 9, 2022): 2038. http://dx.doi.org/10.1149/ma2022-02542038mtgabs.

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Photosystem I (PSI) is one of the primary macromolecular machines that drive photosynthesis in green plants and cyanobacteria. Extracted PSI has been employed successfully as a macromolecular photosensitizer within a host of low-cost electrochemical and solid-state photovoltaic architectures. This presentation will also explore our group’s recent efforts to integrate PSI with advanced nanomaterials, including carbon nanotubes, carbon quantum dots, and conducting polymers polyaniline (PANI), polypyrrole, polyviologens, and poly(3,4-ethylenedioxythiophene). These composite assemblies enhance charge shuttling processes from individual proteins within multilayer assemblies—greatly reducing charge transfer resistances and improving overall efficiency of photocells. The group has reported two new prototype solid-state devices in which PSI or PSI/PANI is sandwiched between energetically appropriate electrodes. The group has also succeeded in stabilizing PSI films via crosslinking to create “wet” photoelectrochemical cells with greater performance and longevity. Finally, our current work is aimed at building new prototypes using PSI in solid state interfaces for scalable solar energy conversion. Finally, the incorporation of PSI into conducting polymer frameworks holds promise for improved conductivity and orientational control in the photoactive layers in these devices.

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Fitriana, Hana-Nur, Soo-Youn Lee, Sun-A. Choi, Ji-Ye Lee, Bo-Lam Kim, Jin-Suk Lee, and You-Kwan Oh. "Electric Stimulation of Astaxanthin Biosynthesis in Haematococcus pluvialis." Applied Sciences 11, no. 8 (April 8, 2021): 3348. http://dx.doi.org/10.3390/app11083348.

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The green microalga Haematococcus pluvialis accumulates astaxanthin, a potent antioxidant pigment, as a defense mechanism against environmental stresses. In this study, we investigated the technical feasibility of a stress-based method for inducing astaxanthin biosynthesis in H. pluvialis using electric stimulation in a two-chamber bioelectrochemical system. When a cathodic (reduction) current of 3 mA (voltage: 2 V) was applied to H. pluvialis cells for two days, considerable lysis and breakage of algal cells were observed, possibly owing to the formation of excess reactive oxygen species at the cathode. Conversely, in the absence of cell breakage, the application of anodic (oxidation) current effectively stimulated astaxanthin biosynthesis at a voltage range of 2–6 V, whereas the same could not be induced in the untreated control. At an optimal voltage of 4 V (anodic current: 30 mA), the astaxanthin content in the cells electro-treated for 2 h was 36.9% higher than that in untreated cells. Our findings suggest that electric treatment can be used to improve astaxanthin production in H. pluvialis culture if bioelectrochemical parameters, such as electric strength and duration, are regulated properly.

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Ayol, Azize, Luciana Peixoto, Tugba Keskin, and Haris Nalakath Abubackar. "Reactor Designs and Configurations for Biological and Bioelectrochemical C1 Gas Conversion: A Review." International Journal of Environmental Research and Public Health 18, no. 21 (November 7, 2021): 11683. http://dx.doi.org/10.3390/ijerph182111683.

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Microbial C1 gas conversion technologies have developed into a potentially promising technology for converting waste gases (CO2, CO) into chemicals, fuels, and other materials. However, the mass transfer constraint of these poorly soluble substrates to microorganisms is an important challenge to maximize the efficiencies of the processes. These technologies have attracted significant scientific interest in recent years, and many reactor designs have been explored. Syngas fermentation and hydrogenotrophic methanation use molecular hydrogen as an electron donor. Furthermore, the sequestration of CO2 and the generation of valuable chemicals through the application of a biocathode in bioelectrochemical cells have been evaluated for their great potential to contribute to sustainability. Through a process termed microbial chain elongation, the product portfolio from C1 gas conversion may be expanded further by carefully driving microorganisms to perform acetogenesis, solventogenesis, and reverse β-oxidation. The purpose of this review is to provide an overview of the various kinds of bioreactors that are employed in these microbial C1 conversion processes.

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Rózsenberszki, Tamás, László Koók, Péter Bakonyi, Nándor Nemestóthy, Washington Logroño, Mario Pérez, Gladys Urquizo, Celso Recalde, Róbert Kurdi, and Attila Sarkady. "Municipal waste liquor treatment via bioelectrochemical and fermentation (H2 + CH4) processes: Assessment of various technological sequences." Chemosphere 171 (March 2017): 692–701. http://dx.doi.org/10.1016/j.chemosphere.2016.12.114.

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Lai, Bin, Anh Nguyen, and Jens Krömer. "Characterizing the Anoxic Phenotype of Pseudomonas putida Using a Bioelectrochemical System." Methods and Protocols 2, no. 2 (March 30, 2019): 26. http://dx.doi.org/10.3390/mps2020026.

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Industrial fermentation in aerobic processes is plagued by high costs due to gas transfer limitations and substrate oxidation to CO2. It has been a longstanding challenge to engineer an obligate aerobe organism, such as Pseudomonas putida, into an anaerobe to facilitate its industrial application. However, the progress in this field is limited, due to the poor understanding of the constraints restricting its anoxic phenotype. In this paper, we provide a methodological description of a novel cultivation technology for P. putida under anaerobic conditions, using the so-called microbial electrochemical technology within a bioelectrochemical system. By using an electrode as the terminal electron acceptor (mediated via redox chemicals), glucose catabolism could be activated without oxygen present. This (i) provides an anoxic-producing platform for sugar acid production at high yield and (ii) more importantly, enables systematic and quantitative characterizations of the phenotype of P. putida in the absence of molecular oxygen. This unique electrode-based cultivation approach offers a tool to understand and in turn engineer the anoxic phenotype of P. putida and possibly also other obligate aerobes.

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Кулешова, Т. Э., Г. Г. Панова, Н. Р. Галль, and А. С. Галушко. "Концентрационный элемент на основе электрогенных процессов в корнеобитаемой среде." Письма в журнал технической физики 48, no. 8 (2022): 29. http://dx.doi.org/10.21883/pjtf.2022.08.52363.19066.

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The experimental bioelectrochemical current source based on the concentration gradient of charge carriers in the root environment of plants has been created. A potential difference of about 70 mV is observed in the nutrient solution. It is gradually decreasing due to equalization of concentrations. The voltage increases to 200 mV when plant are placed in a cultivation system as the root system develops due to the intensification of diffusion processes. The potential-forming role of nitrate forms of nitrogen is shown on the example of lettuce grown according to the panoponics technology. The separation of electrical charges by the root system during the life of plants can become an alternative source of green energy.

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Ramanaiah, Sudarsu, Cristina Cordas, Sara Matias, and Luís Fonseca. "In Situ Electrochemical Characterization of a Microbial Fuel Cell Biocathode Running on Wastewater." Catalysts 11, no. 7 (July 11, 2021): 839. http://dx.doi.org/10.3390/catal11070839.

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The electrochemical features of microbial fuel cells’ biocathodes, running on wastewater, were evaluated by cyclic voltammetry. Ex situ and in situ electrochemical assays were performed and the redox processes associated with the presence of microorganisms and/or biofilms were attained. Different controls using sterile media (abiotic cathode microbial fuel cell) and membranes covering the electrodes were performed to evaluate the source of the electrochemistry response (surface biofilms vs. biotic electrolyte). The bacteria presence, in particular when biofilms are allowed to develop, was related with the enhanced active redox processes associated with an improved catalytic activity, namely for oxygen reduction, when compared with the results attained for an abiotic microbial fuel cell cathode. The microbial main composition was also attained and is in agreement with other reported studies. The current study aims contributing to the establishment of the advantages of using biocathodes rather than abiotic, whose conditions are frequently harder to control and to contribute to a better understanding of the bioelectrochemical processes occurring on the biotic chambers and the electrode surfaces.

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Sander, E. M., B. Virdis, and S. Freguia. "Bioelectrochemical nitrogen removal as a polishing mechanism for domestic wastewater treated effluents." Water Science and Technology 76, no. 11 (September 5, 2017): 3150–59. http://dx.doi.org/10.2166/wst.2017.462.

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Abstract Addition of an external carbon source is usually necessary to guarantee a sufficiently high C/N ratio and enable denitrification in wastewater treatment plants (WWTPs). Alternatively, denitrification processes using autotrophic microorganisms have been proposed i.e., with the use of H2 as electron donor or with the use of cathodic denitrification in bioelectrochemical systems (BES), in which electrons are transferred directly to a denitrifying biofilm. The aim of this work was to investigate and demonstrate the feasibility of applying an easy-to-operate BES as a polishing mechanism for treated secondary clarified effluent from a municipal WWTP, containing low levels of organic matter, buffer capacity and low concentrations of remaining nitrate. In the proposed system, nitrogen removal rates (0.018–0.121 Kg N m−3 d−1) increased with the nitrogen loading rates, suggesting that biofilm kinetics were not rate limiting. The lowest energy consumption for denitrification was 12.7 kWh Kg N−1, equivalent to 0.021 kWh m−3 and could be further reduced by 14% by adding recirculation circuits within both the anode and cathode.

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Khan, Waris, Joo-Youn Nam, Hyoungmin Woo, Hodon Ryu, Sungpyo Kim, Sung Kyu Maeng, and Hyun-Chul Kim. "A proof of concept study for wastewater reuse using bioelectrochemical processes combined with complementary post-treatment technologies." Environmental Science: Water Research & Technology 5, no. 8 (2019): 1489–98. http://dx.doi.org/10.1039/c9ew00358d.

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Guo, Shuang, Wan Qian Guo, Yuan Yuan, Nan Qi Ren, and Ai Jie Wang. "Feasibility Analysis of Anaerobic Biocathode Enhancing Biological Degradation of Recalcitrant Chlorinated Nitroaromatic Compounds (CNAs)." Advanced Materials Research 726-731 (August 2013): 2483–91. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.2483.

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Anaerobic biological technology and bioelectrochemical technology are regarded as promising sustainable wastes treatment processes. With biocatalysis in BESs anode or cathode, various pollutants can be removed. The pollutants range from nitrogen and sulfur to complex compounds. However, the investigation on recalcitrant wastes removal with biocathode has only been reported recently. Recalcitrant wastes, especially chlorinated nitroaromatic compounds, are highly persistent and toxic environmental pollutions which should be removed before discharging to environment. This paper provides a review on anaerobic biocathode BESs for recalcitrant wastes treatment and the feasibility of this system for CANs transformation. It is expected that anaerobic biocathode BESs can provide an appropriate condition for these compounds to transform to easily degradable forms. The technical challenges for future research are also discussed.

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Fachin, Sergio J. S., Eduardo L. Abreu, Carlos A. Mendonça, André Revil, Guilherme C. Novaes, and Suzan S. Vasconcelos. "Self-potential signals from an analog biogeobattery model." GEOPHYSICS 77, no. 4 (July 1, 2012): EN29—EN37. http://dx.doi.org/10.1190/geo2011-0352.1.

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A tank experiment was conducted to check if self-potential (SP) signals can be generated when buried organic matter is wire-connected to a near-surface, oxygen-rich, sediment layer. This experiment demonstrated that once wired, there was a flux of electrons (hence an electric current) between the lower and upper layers of the sandbox with the system responding as a large-scale microbial fuel cell (a type of bioelectrochemical system). An electric current was generated by this process in the wire and the SP method was used to monitor the associated electric potential distribution at the top of the tank. The electric field was controlled by the flux of electrons through the wire, the oxidation of the organic matter, the reduction of oxygen used as a terminal electron acceptor, and the distribution of the DC resistivity in the tank. The current density through the wire was limited by the availability of oxygen and not by the oxidation of the organic matter. This laboratory experiment incorporated key elements of the biogeobattery observed in some organic-rich contaminant plumes. This analogy includes the generation of SP signals associated with a flux of electrons, the capacity of buried organic matter in sustaining anodic reactions, network resistance connecting terminal redox reactions spatially separated in space, and the existence of anodic secondary coupled reactions. A resistivity tomogram of the tank, after almost a year in operation, suggests that oxidative processes triggered by this geobattery can be imaged with this method to determine the radius of influence of the bioelectrochemical system.

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Kuznetsov, A. V., N. N. Khorina, E. Yu Konovalova, D. Yu Amsheev, O. N. Ponamoreva, and D. I. Stom. "Bioelectrochemical processes of oxidation of dicarboxylic amino acids by strain Micrococcus luteus 1-I in a biofuel cell." IOP Conference Series: Earth and Environmental Science 808, no. 1 (July 1, 2021): 012038. http://dx.doi.org/10.1088/1755-1315/808/1/012038.

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Dell’Armi, Edoardo, Marco Zeppilli, Bruna Matturro, Simona Rossetti, Marco Petrangeli Papini, and Mauro Majone. "Effects of the Feeding Solution Composition on a Reductive/Oxidative Sequential Bioelectrochemical Process for Perchloroethylene Removal." Processes 9, no. 3 (February 24, 2021): 405. http://dx.doi.org/10.3390/pr9030405.

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Chlorinated aliphatic hydrocarbons (CAHs) are common groundwater contaminants due to their improper use in several industrial activities. Specialized microorganisms are able to perform the reductive dechlorination (RD) of high-chlorinated CAHs such as perchloroethylene (PCE), while the low-chlorinated ethenes such as vinyl chloride (VC) are more susceptible to oxidative mechanisms performed by aerobic dechlorinating microorganisms. Bioelectrochemical systems can be used as an effective strategy for the stimulation of both anaerobic and aerobic microbial dechlorination, i.e., a biocathode can be used as an electron donor to perform the RD, while a bioanode can provide the oxygen necessary for the aerobic dechlorination reaction. In this study, a sequential bioelectrochemical process constituted by two membrane-less microbial electrolysis cells connected in series has been, for the first time, operated with synthetic groundwater, also containing sulphate and nitrate, to simulate more realistic process conditions due to the possible establishment of competitive processes for the reducing power, with respect to previous research made with a PCE-contaminated mineral medium (with neither sulphate nor nitrate). The shift from mineral medium to synthetic groundwater showed the establishment of sulphate and nitrate reduction and caused the temporary decrease of the PCE removal efficiency from 100% to 85%. The analysis of the RD biomarkers (i.e., Dehalococcoides mccartyi 16S rRNA and tceA, bvcA, vcrA genes) confirmed the decrement of reductive dechlorination performances after the introduction of the synthetic groundwater, also characterized by a lower ionic strength and nutrients content. On the other hand, the system self-adapted the flowing current to the increased demand for the sulphate and nitrate reduction, so that reducing power was not in defect for the RD, although RD coulombic efficiency was less.

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Cecconet, Daniele, Arianna Callegari, and Andrea Capodaglio. "Bioelectrochemical Systems for Removal of Selected Metals and Perchlorate from Groundwater: A Review." Energies 11, no. 10 (October 3, 2018): 2643. http://dx.doi.org/10.3390/en11102643.

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Groundwater contamination is a major issue for human health, due to its largely diffused exploitation for water supply. Several pollutants have been detected in groundwater; amongst them arsenic, cadmium, chromium, vanadium, and perchlorate. Various technologies have been applied for groundwater remediation, involving physical, chemical, and biological processes. Bioelectrochemical systems (BES) have emerged over the last 15 years as an alternative to conventional treatments for a wide variety of wastewater, and have been proposed as a feasible option for groundwater remediation due to the nature of the technology: the presence of two different redox environments, the use of electrodes as virtually inexhaustible electron acceptor/donor (anode and cathode, respectively), and the possibility of microbial catalysis enhance their possibility to achieve complete remediation of contaminants, even in combination. Arsenic and organic matter can be oxidized at the bioanode, while vanadium, perchlorate, chromium, and cadmium can be reduced at the cathode, which can be biotic or abiotic. Additionally, BES has been shown to produce bioenergy while performing organic contaminants removal, lowering the overall energy balance. This review examines the application of BES for groundwater remediation of arsenic, cadmium, chromium, vanadium, and perchlorate, focusing also on the perspectives of the technology in the groundwater treatment field.

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Heiskanen, Arto, Vasile Coman, Natalie Kostesha, David Sabourin, Nick Haslett, Keith Baronian, Lo Gorton, Martin Dufva, and Jenny Emnéus. "Bioelectrochemical probing of intracellular redox processes in living yeast cells—application of redox polymer wiring in a microfluidic environment." Analytical and Bioanalytical Chemistry 405, no. 11 (February 1, 2013): 3847–58. http://dx.doi.org/10.1007/s00216-013-6709-4.

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Bakonyi, Péter, Jeyaprakash Dharmaraja, Sutha Shobana, László Koók, Tamás Rózsenberszki, Nándor Nemestóthy, Rajesh Banu J, Katalin Bélafi-Bakó, and Gopalakrishnan Kumar. "Leachate valorization in anaerobic biosystems: Towards the realization of waste-to-energy concept via biohydrogen, biogas and bioelectrochemical processes." International Journal of Hydrogen Energy 44, no. 32 (June 2019): 17278–96. http://dx.doi.org/10.1016/j.ijhydene.2019.02.028.

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Kong, Da Seul, Eun Joo Park, Sakuntala Mutyala, Minsoo Kim, Yunchul Cho, Sang Eun Oh, Changman Kim, and Jung Rae Kim. "Bioconversion of Crude Glycerol into 1,3-Propanediol(1,3-PDO) with Bioelectrochemical System and Zero-Valent Iron Using Klebsiella pneumoniae L17." Energies 14, no. 20 (October 18, 2021): 6806. http://dx.doi.org/10.3390/en14206806.

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Crude glycerol is a major byproduct in the production of biodiesel and contains a large number of impurities. The transformation of crude glycerol into valuable compounds such as 1,3-propanediol (1,3-PDO) using clean and renewable processes, like bioconversion, is an important task for the future of the chemical industry. In this study, 1,3-PDO bioproductions from crude and pure glycerol were estimated as 15.4 ± 0.8 and 11.4 ± 0.1 mmol/L, respectively. Because 1,3-PDO is a reductive metabolite that requires additional reducing energy, external supplements of electron for further improvement of 1,3-PDO biosynthesis were attempted using a bioelectrochemical system (BES) or zero-valent iron (ZVI). The conversions of crude and pure glycerol under electrode and iron-based cultivation were investigated for 1,3-PDO production accompanied by metabolic shift and cell growth. The BES-based conversion produced 32.6 ± 0.6 mmol/L of 1,3-PDO with ZVI implementation.

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Kouzuma, Atsushi. "Molecular mechanisms regulating the catabolic and electrochemical activities of Shewanella oneidensis MR-1." Bioscience, Biotechnology, and Biochemistry 85, no. 7 (May 17, 2021): 1572–81. http://dx.doi.org/10.1093/bbb/zbab088.

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ABSTRACT Electrochemically active bacteria (EAB) interact electrochemically with electrodes via extracellular electron transfer (EET) pathways. These bacteria have attracted significant attention due to their utility in environmental-friendly bioelectrochemical systems (BESs), including microbial fuel cells and electrofermentation systems. The electrochemical activity of EAB is dependent on their carbon catabolism and respiration; thus, understanding how these processes are regulated will provide insights into the development of a more efficient BES. The process of biofilm formation by EAB on BES electrodes is also important for electric current generation because it facilitates physical and electrochemical interactions between EAB cells and electrodes. This article summarizes the current knowledge on EET-related metabolic and cellular functions of a model EAB, Shewanella oneidensis MR-1, focusing specifically on regulatory systems for carbon catabolism, EET pathways, and biofilm formation. Based on recent developments, the author also discusses potential uses of engineered S. oneidensis strains for various biotechnological applications.

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Rodziewicz, Joanna, Artur Mielcarek, Wojciech Janczukowicz, Kamil Bryszewski, Agata Jabłońska-Trypuć, and Urszula Wydro. "Technological Parameters of Rotating Electrochemical and Electrobiological Disk Contactors Depending on the Effluent Quality Requirements." Applied Sciences 12, no. 11 (May 29, 2022): 5503. http://dx.doi.org/10.3390/app12115503.

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Soilless tomato cultivation wastewater, with typically low COD, high concentrations of phosphorus, and oxidized forms of nitrogen, may be effectively treated in a rotating electrochemical disk contactor (RECDC) and in a bioelectrochemical reactor (BER), such as a rotating electrobiological disk contactor (REBDC). The aim of this study was to determine the technological parameters of both reactors, i.e., electric current density (J) and hydraulic retention time (HRT), depending on the effluent quality requirements. The study was conducted with four one-stage RECDCs and with four one-stage REBDCs, at four hydraulic retention times, i.e., 4, 8, 12, and 24 h, and electric current densities of 0.63, 1.25, 2.50, 5.00, and 10.00 A/m2. It was demonstrated that soilless tomato cultivation wastewater could be effectively treated in electrochemical and electrobiological disk contactors, and then discharged to sewage system facilities. In a RECDC, the highest denitrification (53.4%) and dephosphatation (99.8%) performance was achieved at J = 10.0 A/m2 and HRT = 24 h. If the effluents are to be discharged to natural reservoirs, their effective treatment is only feasible in a REBDC. The bioelectrochemical disk contactor ensured over 90% dephosphatation effectiveness. At HRT = 24 h and all electric current densities studied, the concentrations of pollutants in the effluent met requirements set for industrial wastewater discharged into natural waters and the ground. By applying J = 2.5 A/m2 and HRT = 24 h in the REBDC, it was possible to achieve a phosphorus concentration below 3.0 mg P/L and concentrations of ammonia nitrogen and nitrites lower than the permissible levels for treated industrial wastewater introduced to waters and to the ground. Given the nitrate concentration (exceeding 30 mg N/L), an external carbon source is recommended to aid a treatment process that uses a technological system with a REBDC. Technological schemes were proposed for wastewater treatment plants (WWTPs) with a RECDC and a REBDC, for discharging treated wastewater to natural waters, the ground, and sewage systems.

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Wang, Liuying, Zhenyue Lin, Shurui Liu, Dun Fu, Zhipeng Li, Qingliu Luo, Jianwu Tang, Zheng Chen, Ning He, and Yuanpeng Wang. "The effect of extracellular electron transfer on arsenic speciation transformation in a soil bioelectrochemical system." Soil and Tillage Research 204 (October 2020): 104723. http://dx.doi.org/10.1016/j.still.2020.104723.

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Li, Shuwei, Young Eun Song, Jiyun Baek, Hyeon Sung Im, Mutyala Sakuntala, Minsoo Kim, Chulhwan Park, Booki Min, and Jung Rae Kim. "Bioelectrosynthetic Conversion of CO2 Using Different Redox Mediators: Electron and Carbon Balances in a Bioelectrochemical System." Energies 13, no. 10 (May 19, 2020): 2572. http://dx.doi.org/10.3390/en13102572.

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Microbial electrosynthesis (MES) systems can convert CO2 to acetate and other value-added chemicals using electricity as the reducing power. Several electrochemically active redox mediators can enhance interfacial electron transport between bacteria and the electrode in MES systems. In this study, different redox mediators, such as neutral red (NR), 2-hydroxy-1,4-naphthoquinone (HNQ), and hydroquinone (HQ), were compared to facilitate an MES-based CO2 reduction reaction on the cathode. The mediators, NR and HNQ, improved acetate production from CO2 (165 mM and 161 mM, respectively) compared to the control (without a mediator = 149 mM), whereas HQ showed lower acetate production (115 mM). On the other hand, when mediators were used, the electron and carbon recovery efficiency decreased because of the presence of bioelectrochemical reduction pathways other than acetate production. Cyclic voltammetry of an MES with such mediators revealed CO2 reduction to acetate on the cathode surface. These results suggest that the addition of mediators to MES can improve CO2 conversion to acetate with further optimization in an operating strategy of electrosynthesis processes.

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Perazzoli, Simone, José Pedro de Santana Neto, and Hugo M. Soares. "Anoxic-biocathode microbial desalination cell as a new approach for wastewater remediation and clean water production." Water Science and Technology 81, no. 3 (February 1, 2020): 550–63. http://dx.doi.org/10.2166/wst.2020.134.

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Abstract Bioelectrochemical systems are emerging as a promising and friendly alternative to convert the energy stored in wastewater directly into electricity by microorganisms and utilize it in situ to drive desalination. To better understand such processes, we propose the development of an anoxic biocathode microbial desalination Cell for the conversion of carbon- and nitrogen-rich wastewaters into bioenergy and to perform salt removal. Our results demonstrate a power output of 0.425 W m−3 with desalination, organic matter removal and nitrate conversion efficiencies of 43.69, 99.85 and 92.11% respectively. Microbiological analysis revealed Proteobacteria as the dominant phylum in the anode (88.45%) and biocathode (97.13%). While a relatively higher bacterial abundance was developed in the anode chamber, the biocathode showed a greater variety of microorganisms, with a predominance of Paracoccus (73.2%), which are related to the denitrification process. These findings are promising and provide new opportunities for the development and application of this technology in the field of wastewater treatment to produce cleaner water and conserve natural resources.

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Ghiara, Giorgia, Stefano Trasatti, Andrea Goglio, and Pierangela Cristiani. "Testing novel multicomposite materials for electromethanogenesis." E3S Web of Conferences 334 (2022): 08012. http://dx.doi.org/10.1051/e3sconf/202233408012.

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Electromethanogenesis is an innovative technology that uses a microbial electrochemical system to produce methane from CO2, in a power-to-gas (BEP2G) concept. The results of experimental tests of new and cost-effective carbonaceous materials for electrode are presented here. The study aims at optimizing electromethanogenesis processes at laboratory level in mesothermic condition. As part of the experiments, hydrogenotrophic microorganisms (Family Metanobacteriaceae of Archaea domains) were selected from a mixed consortium taken from a biogas digestate and inoculated in double-chamber bioelectrochemical systems. The maximum amount of methane produced was 0.3 - 0.8 mol/m2g (normalized to the cathode area) with carbon cloth electrodes. Aiming at improving the methane productivity, innovative materials for the electrodes were now studied, creating porous high-surface composites, and studying nitrogen carbons doped with Cu and hydroxyapatite (Multicomposite Cu@/HAP/C), as chemical catalysts for CO2 reduction (CO2RR). The description of the procedure for the Multicomposite Cu@/HAP/C production is reported in detail.

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Faustino, Marisa M., Bruno M. Fonseca, Nazua L. Costa, Diana Lousa, Ricardo O. Louro, and Catarina M. Paquete. "Crossing the Wall: Characterization of the Multiheme Cytochromes Involved in the Extracellular Electron Transfer Pathway of Thermincola ferriacetica." Microorganisms 9, no. 2 (January 31, 2021): 293. http://dx.doi.org/10.3390/microorganisms9020293.

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Bioelectrochemical systems (BES) are emerging as a suite of versatile sustainable technologies to produce electricity and added-value compounds from renewable and carbon-neutral sources using electroactive organisms. The incomplete knowledge on the molecular processes that allow electroactive organisms to exchange electrons with electrodes has prevented their real-world implementation. In this manuscript we investigate the extracellular electron transfer processes performed by the thermophilic Gram-positive bacteria belonging to the Thermincola genus, which were found to produce higher levels of current and tolerate higher temperatures in BES than mesophilic Gram-negative bacteria. In our study, three multiheme c-type cytochromes, Tfer_0070, Tfer_0075, and Tfer_1887, proposed to be involved in the extracellular electron transfer pathway of T. ferriacetica, were cloned and over-expressed in E. coli. Tfer_0070 (ImdcA) and Tfer_1887 (PdcA) were purified and biochemically characterized. The electrochemical characterization of these proteins supports a pathway of extracellular electron transfer via these two proteins. By contrast, Tfer_0075 (CwcA) could not be stabilized in solution, in agreement with its proposed insertion in the peptidoglycan wall. However, based on the homology with the outer-membrane cytochrome OmcS, a structural model for CwcA was developed, providing a molecular perspective into the mechanisms of electron transfer across the peptidoglycan layer in Thermincola.

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Moradian, Jamile Mohammadi, Songmei Wang, Amjad Ali, Junying Liu, Jianli Mi, and Hongcheng Wang. "Biomass-Derived Carbon Anode for High-Performance Microbial Fuel Cells." Catalysts 12, no. 8 (August 13, 2022): 894. http://dx.doi.org/10.3390/catal12080894.

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Although microbial fuel cells (MFCs) have been developed over the past decade, they still have a low power production bottleneck for practical engineering due to the ineffective interfacial bioelectrochemical reaction between exoelectrogens and anode surfaces using traditional carbonaceous materials. Constructing anodes from biomass is an effective strategy to tackle the current challenges and improve the efficiency of MFCs. The advantage features of these materials come from the well-decorated aspect with an enriched functional group, the turbostratic nature, and porous structure, which is important to promote the electrocatalytic behavior of anodes in MFCs. In this review article, the three designs of biomass-derived carbon anodes based on their final products (i.e., biomass-derived nanocomposite carbons for anode surface modification, biomass-derived free-standing three-dimensional carbon anodes, and biomass-derived carbons for hybrid structured anodes) are highlighted. Next, the most frequently obtained carbon anode morphologies, characterizations, and the carbonization processes of biomass-derived MFC anodes were systematically reviewed. To conclude, the drawbacks and prospects for biomass-derived carbon anodes are suggested.

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Gihaz, Shalev, Nidaa Shrara Herzallh, Yifat Cohen, Oren Bachar, Ayelet Fishman, and Omer Yehezkeli. "The Structure of Bilirubin Oxidase from Bacillus pumilus Reveals a Unique Disulfide Bond for Site-Specific Direct Electron Transfer." Biosensors 12, no. 5 (April 19, 2022): 258. http://dx.doi.org/10.3390/bios12050258.

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Efficient oxygen-reducing biocatalysts are essential for the development of biofuel cells or photo-bioelectrochemical applications. Bilirubin oxidase (BOD) is a promising biocatalyst for oxygen reduction processes at neutral pH and low overpotentials. BOD has been extensively investigated over the last few decades. While the enzyme’s internal electron transfer process and methods to establish electrical communication with electrodes have been elucidated, a crystal structure of BOD from bacterial origin has never been determined. Here we present the first crystal structure of BOD from Bacillus pumilus (BpBOD) at 3.5 Å resolution. Overall, BpBOD shows high homology with the fungal enzymes; however, it holds a unique surface-exposed disulfide bond between Cys229 and Cys322 residues. We present methodologies to orient the T1 site towards the electrode by coupling the reduced disulfide bond with maleimide moiety on the electrodes. The developed configurations were further investigated and revealed improved direct electron transfer rates with the electrodes. The work presented here may contribute to the construction of rationally designed bioanodes or biocathode configurations that are based on redox-active enzymes.

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Tkachuk, Nataliia, and Liubov Zelena. "The Impact of Bacteria of the Genus Bacillus upon the Biodamage/Biodegradation of Some Metals and Extensively Used Petroleum-Based Plastics." Corrosion and Materials Degradation 2, no. 4 (September 26, 2021): 531–53. http://dx.doi.org/10.3390/cmd2040028.

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This paper tackles bacteria of the genus Bacillus as both biodamaging/biodegrading and biocontrolling agents. The article addresses the said bacteria’s ability to form biofilms and corrosive, antimicrobial and antibiofilm proactive compounds, primarily, siderophores. Their role depends on the species, microorganism strain, production of antimicrobial substances, biofilm formation, and the type of damaged material. The bacteria under analysis have demonstrated the ability to cause as well as inhibit biodamage. The involvement of bacteria of the genus Bacillus in microbiologically influenced corrosion processes is determined by the production of corrosive metabolites and the impact of certain bioelectrochemical mechanisms. Lipopeptides generated by Bacillus subtilis (surfactin, iturin and fengycin) are capable of modifying surfaces’ hydrophobic properties and impacting the microbes’ adhesion to surfaces. Produced by Bacillus velezensis, the siderophore bacillibactin at a high concentration is capable of inhibiting the formation of bacterial biofilms, thus slowing down the degradation of materials. Further study of siderophores as green inhibitors of microbiologically influenced corrosion may be promising as the said compounds possess antibiofilm-forming properties and high-intensity inhibitory capabilities.

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Journal articles on the topic 'Bioelectrochemical processes'

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