Chuanhao Yao, Na Guo, Shibo Xi et al.

Nature Communications • 2020

The ability to precisely engineer the doping of sub-nanometer bimetallic clusters offers exciting opportunities for tailoring their catalytic performance with atomic accuracy. However, the fabrication of singly dispersed bimetallic cluster catalysts with atomic-level control of dopants has been a long-standing challenge. Herein, we report a strategy for the controllable synthesis of a precisely doped single cluster catalyst consisting of partially ligand-enveloped Au 4 Pt 2 clusters supported on defective graphene. This creates a bimetal single cluster catalyst (Au 4 Pt 2 /G) with exceptional activity for electrochemical nitrogen (N 2 ) reduction. Our mechanistic study reveals that each N 2 molecule is activated in the confined region between cluster and graphene. The heteroatom dopant plays an indispensable role in the activation of N 2 via an enhanced back donation of electrons to the N 2 LUMO. Moreover, besides the heteroatom Pt, the catalytic performance of single cluster catalyst can be further tuned by using Pd in place of Pt as the dopant.

Daniela Pichardo-Romero, Zahirid Patricia Garcia-Arce, Alejandra Zavala-Ramírez et al.

Processes • 2020

Membranes, as the primary tool in membrane separation techniques, tend to suffer external deposition of pollutants and microorganisms depending on the nature of the treating solutions. Such issues are well recognized as biofouling and is identified as the major drawback of pressure-driven membrane processes due to the influence of the separation performance of such membrane-based technologies. Herein, the aim of this review paper is to elucidate and discuss new insights on the ongoing development works at facing the biofouling phenomenon in membranes. This paper also provides an overview of the main strategies proposed by “membranologists” to improve the fouling resistance in membranes. Special attention has been paid to the fundamentals on membrane fouling as well as the relevant results in the framework of mitigating the issue. By analyzing the literature data and state-of-the-art, the concluding remarks and future trends in the field are given as well.

Mohammad Reza Zamani, Gagik Badalians Gholikandi, Bijan Yeganeh

Biomass and Bioenergy • 2025

Yasser Bashir, Rishabh Raj, Makarand M. Ghangrekar et al.

RSC Sustainability • 2023

Remediation of emerging contaminants (ECs), such as personal care products, antibiotics, endocrine-disrupting chemicals (EDCs), surfactants, pesticides, etc. , via advanced oxidation processes (AOPs) and integrated bioelectrochemical systems (BESs).

Maida Aysla Costa de Oliveira, Barbara Mecheri, Alessandra D’Epifanio et al.

Journal of Power Sources • 2017

T. E. Kuleshova, Z. A. Gasieva, Д. В. Русаков et al.

BIOPHYSICS • 2024

Bioelectrochemical systems based on electroactive processes in the root environment of plants are a promising direction for the combined production of green electricity and plant products. The dynamics of the electric potential differences formation in the root environment, diffuse reflection indices, fluorescence parameters of leaves, and morphometric and biochemical characteristics of lettuce varieties Chinese curly, Chinese red-green, Ballet, Cocarde, Mercury, Dubrava, Robin, and Solos F1 hybrid are studied. The maximum electric potential difference of 430 mV was typical for the Mercury variety, and the minimum of 352 mV for the Chinese Curly variety. According to the sum of the parameters, in addition to the electrical ones, including the morphometric, biochemical, and photosynthetic characteristics, the lettuce Ballet variety was the best. In the future, based on the data obtained, it will be possible to create agrophytocenoses, including plants capable of high and stable electricity generation together with high productivity and good quality of the plant products obtained, due to the effective assimilation and conversion of light energy.

Naef A.A. Qasem, Gubran A.Q. Abdulrahman

International Journal of Energy Research • 2024

This review discusses the history, fundamentals, and applications of different fuel cell technologies, including proton exchange membrane fuel cells (PEMFCs), direct methanol fuel cells, solid oxide fuel cells (SOFCs), phosphoric acid fuel cells (PAFCs), alkaline fuel cells (AFCs), and molten carbonate fuel cells (MCFCs). Recent advances in fuel cell technologies have led to potential applications in aerospace, transportation, and portable and stationary power generation due to high efficiency and low emissions. Fuel cell types are also compared based on efficiency, operating temperature, lifetime, energy/power density, and cost. It was noticed that PEMFCs have the highest mass power density, reaching 1,000 W/kg compared to less than 100 W/kg for SOFCs, which makes them suitable for portable applications such as aircraft. PEMFCs and AFCs are suitable for low‐temperature applications and are highly efficient. SOFCs and MCFCs are better for high‐temperature operations. SOFCs are robust and suitable for high‐power demands, while MCFCs are advantageous for high‐power output. Hydrogen fuel cells promise to decarbonize transportation and aviation sectors with the advantages of lower weight, compactness, and quick startup times. However, challenges remain around renewable hydrogen production/infrastructure and aircraft integration, besides hydrogen storage, water management inside fuel cells, and operational robustness under varying pressures. Generally, for all fuel cell types, more focus should be given to enhancing the stability and efficiency of fuel cell materials and reducing their cost.

Lesheng Li, John Mark P. Martirez, Emily A. Carter

ACS Catalysis • 2020

Identifying efficient electrocatalysts with low overpotential and high selectivity for producing ammonia from nitrogen gas is essential for any future electrocatalytic nitrogen reduction reaction (NRR)-based ammonia synthesis. Via density functional theory calculations and the computational hydrogen electrode model, we systematically examine the prospect of using a single-transition-metal (TM)-atom-doped graphene-like GaN (g-GaN) monolayer as an electrocatalyst for artificial nitrogen reduction. Among 15 TMs investigated, the Mo-doped g-GaN (Mo@g-GaN) monolayer is the only electrocatalyst predicted to be feasible for the NRR. The Mo@g-GaN monolayer satisfies all screening criteria considered for activating the inert N≡N triple bond effectively, including stabilization of the adsorbed (*) NRR intermediate *NNH and destabilization of the *NH2 species. This monolayer also possesses sufficient overall stability. A complete analysis of the likely mechanisms involved in the NRR on this catalyst suggests that the Mo@g-GaN monolayer could exhibit promising NRR catalytic activity. It achieves this via one specific (distal) pathway, which has a very low onset potential of −0.33 V vs the reversible hydrogen electrode (RHE), corresponding to a low overpotential of 0.42 V vs the RHE, defined using the measured equilibrium potential for NRR of 0.09 V vs the RHE. The potential-determining step, conversion of *NH2 to *NH3, also exhibits a surmountable barrier of 0.42 eV, suggesting kinetics will be facile. Finally, the Mo@g-GaN monolayer is predicted to exhibit substantial selectivity (∼31%) toward ammonia synthesis over the competing hydrogen evolution reaction. These findings may open a potential route for artificial ammonia synthesis using a single-atom catalyst under ambient conditions.

Rabia Tasaduq Hussain, Baala H. Anandapadmanaban, Chi-Wen Lin et al.

Journal of environmental chemical engineering • 2026

C. de la Puente, R. Mateos, A. Morán et al.

Renewable and Sustainable Energy Reviews • 2026

The sustainable production of biofuels remains a central challenge in the transition to low-carbon energy systems. Fermentative processes have been extensively developed for ethanol, butanol, methane, and hydrogen, yet their efficiency is constrained by redox imbalances which cause metabolic regulation bottlenecks. Electroactive Fermentative Technologies (EAFT), including electrofermentation and other bioelectrochemical systems, offer bioelectrochemical control of microbial metabolism to improve yields, product selectivity and energy efficiency. This systematic review synthesizes current progress in traditional fermentation and Electroactive Fermentative Technologies, focusing on performance indicators, techno-economic implications, and environmental impacts. Findings were harmonized through unit standardization for quantitative outcomes and thematic synthesis for qualitative evidence. The analysis highlights that while EAFT can enhance redox balance, increase substrate selectivity, and couple microbial metabolism with renewable electricity, it remains at a low technology readiness level and faces operational, economic, and scale-up barriers. Common challenges across both conventional and electrofermentative approaches include feedstock variability, inefficient downstream recovery, and the lack of integrated techno-economic and life-cycle assessments. Future research should prioritize systems biology and metabolic engineering for pathway optimization, hybrid configurations combining EAFT with established processes, and demonstration at pilot and commercial scale. Although EAFT is not yet a mature substitute for traditional fermentation, its ability to couple microbial metabolism with bioelectrochemical control positions it as a transformative platform for next-generation biofuel and biorefinery applications. • This review maps recent advances in fermentation and EAFT across four biofuels. • EAFT improves redox control, boosts yields, and enhances carbon-use efficiency. • Scale-up is constrained by mass transfer, metabolic limits, and reactor design. • Environmental and techno-economic evidence remains limited across biofuel systems. • Future progress needs integrated biorefineries plus better strains and reactors.

Yuchen Ding, John R. Bertram, Carrie A. Eckert et al.

Journal of the American Chemical Society • 2019

Living cells do not interface naturally with nanoscale materials, although such artificial organisms can have unprecedented multifunctional properties, like wireless activation of enzyme function using electromagnetic stimuli. Realizing such interfacing in a nanobiohybrid organism (or nanorg) requires (1) chemical coupling via affinity binding and self-assembly, (2) the energetic coupling between optoelectronic states of artificial materials with the cellular process, and (3) the design of appropriate interfaces ensuring biocompatibility. Here we show that seven different core-shell quantum dots (QDs), with excitations ranging from ultraviolet to near-infrared energies, couple with targeted enzyme sites in bacteria. When illuminated by light, these QDs drive the renewable production of different biofuels and chemicals using carbon-dioxide (CO 2 ), water, and nitrogen (from air) as substrates. These QDs use their zinc-rich shell facets for affinity attachment to the proteins. Cysteine zwitterion ligands enable uptake through the cell, facilitating cell survival. Together, these nanorgs catalyze light-induced air-water-CO 2 reduction with a high turnover number (TON) of ∼10 6 -10 8 (mols of product per mol of cells) to biofuels like isopropanol (IPA), 2,3-butanediol (BDO), C 11 -C 15 methyl ketones (MKs), and hydrogen (H 2 ); and chemicals such as formic acid (FA), ammonia (NH 3 ), ethylene (C 2 H 4 ), and degradable bioplastics polyhydroxybutyrate (PHB). Therefore, these resting cells function as nanomicrobial factories powered by light.

Padmaja Shastri, Carolina Fiallos Herrera, Elyssa Jane Gargallano et al.

Discover Applied Sciences • 2025

Bioelectrochemical systems (BES) are a promising renewable energy source that harnesses the interaction between biotic and abiotic components to generate power. However, microbial, along with electrode material compatibility factors, can hinder power generation, leading to energy losses in BES. This review explores recent advancements and challenges in BES power generation, with a focus on how best to optimize electrochemical coupling. Electrochemical coupling can help provide sustainable energy to drive reductive reactions at the biocathode, contributing to green synthesis of value-added chemicals. The review evaluates the role of electrochemical coupling devices and highlights the significance of microbial biofilm-to-EPS ratio at the electrode interface, which is critical to BES performance, and is influenced by applied currents. Strategies to enhance biofilm robustness and mitigate biofouling through electrode modifications are discussed. Further, we analyze electron transfer mechanisms at the microbe–electrode interface and explore bioengineering approaches to improve electron transfer efficiency. Advancements in electrode materials and novel modifications are also reviewed, along with the potential of plant-based fuel cells as alternative electron sources for driving reductive reactions. The review concludes by showcasing innovative hybrid system designs, paving the way for energy self-sufficient and multi-functional BES platforms that can help drive electrochemical coupling.

Synthia Maes, Wei‐Qin Zhuang, Korneel Rabaey et al.

Environmental Science & Technology • 2017

Rare earth elements (REEs) have become increasingly important in modern day technologies. Unfortunately, their recycling is currently limited, and the conventional technologies for their extraction and purification are exceedingly energy and chemical intensive. New sustainable technologies for REE extraction from both primary and secondary resources would be extremely beneficial. This research investigated a two-stage recovery strategy focused on the recovery of neodymium (Nd) and lanthanum (La) from monazite ore that combines microbially based leaching (using citric acid and spent fungal supernatant) with electrochemical extraction. Pretreating the phosphate-based monazite rock (via roasting) dramatically increased the microbial REE leaching efficiency. Batch experiments demonstrated the effective and continued leaching of REEs by recycled citric acid, with up to 392 mg of Nd L -1 and 281 mg of La L -1 leached during seven consecutive 24 h cycles. Neodymium was further extracted in the catholyte of a three-compartment electrochemical system, with up to 880 mg of Nd L -1 achieved within 4 days (at 40 A m -2 ). Meanwhile, the radioactive element thorium and counterions phosphate and citrate were separated effectively from the REEs in the anolyte, favoring REE extraction and allowing sustainable reuse of the leaching agent. This study shows a promising technology that is suitable for primary ores and can further be optimized for secondary resources.

Simin Arshi, Mehran Nozari-Asbemarz, Edmond Magner

Catalysts • 2020

Biocatalysts provide a number of advantages such as high selectivity, the ability to operate under mild reaction conditions and availability from renewable resources that are of interest in the development of bioreactors for applications in the pharmaceutical and other sectors. The use of oxidoreductases in biocatalytic reactors is primarily focused on the use of NAD(P)-dependent enzymes, with the recycling of the cofactor occurring via an additional enzymatic system. The use of electrochemically based systems has been limited. This review focuses on the development of electrochemically based biocatalytic reactors. The mechanisms of mediated and direct electron transfer together with methods of immobilising enzymes are briefly reviewed. The use of electrochemically based batch and flow reactors is reviewed in detail with a focus on recent developments in the use of high surface area electrodes, enzyme engineering and enzyme cascades. A future perspective on electrochemically based bioreactors is presented.

Oleksiy Melnyk, Svitlana Onyshсhenko, Vlada Zhykharieva

Lex Portus • 2025

This article explores the changing landscape of next-generation bioenergy technologies and their relevance to the maritime sector amidst increasing global decarbonization efforts. It specifically highlights microalgae-based fuels, residual biomass, and hybrid biochemical-thermochemical systems, forming a varied platform for low-carbon energy. Through comparative analysis of technology, environment, and regulation, the study pinpoints key hurdles for large-scale use – such as high costs, infrastructure challenges, and regulatory inconsistencies. Attention is given to current gaps in the IMO framework, which hinder the recognition and adoption of biofuels despite their potential to significantly reduce emissions from production to use. The article emphasizes that uniform global standards, port upgrades, and support for innovative solutions like genetically optimized microalgae, bioelectrochemical systems, and blockchain tracking are crucial to advancing toward climate-neutral maritime operations.

Thamires Custódio Jeremias, Ana Carla Sorgato, María Ángeles Lobo-Recio et al.

BioEnergy Research • 2025

Yongbei Ye, Xindi Chen, Haoran Xin et al.

Separation and Purification Technology • 2024

Nikolay Kornienko, Kelsey K. Sakimoto, David M. Herlihy et al.

Proceedings of the National Academy of Sciences • 2016

The rise of inorganic-biological hybrid organisms for solar-to-chemical production has spurred mechanistic investigations into the dynamics of the biotic-abiotic interface to drive the development of next-generation systems. The model system, Moorella thermoacetica-cadmium sulfide (CdS), combines an inorganic semiconductor nanoparticle light harvester with an acetogenic bacterium to drive the photosynthetic reduction of CO 2 to acetic acid with high efficiency. In this work, we report insights into this unique electrotrophic behavior and propose a charge-transfer mechanism from CdS to M. thermoacetica Transient absorption (TA) spectroscopy revealed that photoexcited electron transfer rates increase with increasing hydrogenase (H 2 ase) enzyme activity. On the same time scale as the TA spectroscopy, time-resolved infrared (TRIR) spectroscopy showed spectral changes in the 1,700-1,900-cm -1 spectral region. The quantum efficiency of this system for photosynthetic acetic acid generation also increased with increasing H 2 ase activity and shorter carrier lifetimes when averaged over the first 24 h of photosynthesis. However, within the initial 3 h of photosynthesis, the rate followed an opposite trend: The bacteria with the lowest H 2 ase activity photosynthesized acetic acid the fastest. These results suggest a two-pathway mechanism: a high quantum efficiency charge-transfer pathway to H 2 ase generating H 2 as a molecular intermediate that dominates at long time scales (24 h), and a direct energy-transducing enzymatic pathway responsible for acetic acid production at short time scales (3 h). This work represents a promising platform to utilize conventional spectroscopic methodology to extract insights from more complex biotic-abiotic hybrid systems.

Julie Dubuit, Alexandra Bertron, Fabrice Deby et al.

Journal of Power Sources • 2024

Hexing Li, Hong-Yu Ren, Qiang Fu et al.

Process Safety and Environmental Protection • 2026

Yangyang Yu, Yan‐Zhai Wang, Zhen Fang et al.

Nature Communications • 2020

By electronically wiring-up living cells with abiotic conductive surfaces, bioelectrochemical systems (BES) harvest energy and synthesize electric-/solar-chemicals with unmatched thermodynamic efficiency. However, the establishment of an efficient electronic interface between living cells and abiotic surfaces is hindered due to the requirement of extremely close contact and high interfacial area, which is quite challenging for cell and material engineering. Herein, we propose a new concept of a single cell electron collector, which is in-situ built with an interconnected intact conductive layer on and cross the individual cell membrane. The single cell electron collector forms intimate contact with the cellular electron transfer machinery and maximizes the interfacial area, achieving record-high interfacial electron transfer efficiency and BES performance. Thus, this single cell electron collector provides a superior tool to wire living cells with abiotic surfaces at the single-cell level and adds new dimensions for abiotic/biotic interface engineering.

Adikesavan Selvi, Aruliah Rajasekar, Jayaraman Theerthagiri et al.

Frontiers in Environmental Science • 2019

Addressing heavy metal pollution isone of the hot areas of environmental research.Despite natural existence, various anthropomorphic sources have contributed to an unusually high concentration of heavy metals in the environment.They are characterized by their long persistence in natural environment leading to serious health consequences in humans, animals, and plants even at very low concentrations (1 or 2 μg in some cases). Failure of strict regulations by government authorities is also to be blamed for heavy metal pollution. Several individual treatments, namely, physical, chemical and biological are being implied to remove heavy metals from the environment.But, they all face challenges in terms of expensiveness and in-situ treatment failure.Hence, integrated processes are gaining popularity as it is reported to achieve the goal effectively in various environmental matrices and will overcome a major drawback of large scale implementation.Integrated processes are the combination of two different methods to achieve a synergistic and an effective effort to remove heavy metals. Most of the review articles published so far mainly focus on individual methods on specific heavy metal removal, that too from a particular environmental matrix only.To the best of our knowledge, this is the first review of this kind that summarizes on various integrated processes for heavy metal removal from all environmental matrices. In addition, we too have discussed on the advantages and disadvantages of each integrated process, with a special mention of the few methods that needs more research attention. To conclude, integrated processes areproved as a right remedial option which has been detaily discussed in the present review. However, more research focus on the process is needed to challenge the in-situ operative conditions. We believe, this review on integrated processes will surely evoke a research thrust that could give rise to novel remediation projects for research community in the future.

Darshita Valde, Ashish Kumar Nayak, S. G. Sahu et al.

Journal of Engineering • 2025

Microbial fuel cells and microbial electrolysis cells have been widely studied for their potential in wastewater remediation and renewable energy generation, yet most reviews and prior research address these bioelectrochemical systems as independent configurations. However, the integration of MFCs and MECs forming hybrid systems has not been systematically reviewed, despite emerging evidence that such integration offers unique synergies for energy‐neutral operation, enhanced biohydrogen recovery, and resource‐efficient wastewater treatment. The absence of focused analyses on operational mechanisms, integration strategies, and scale‐up challenges of MFC–MEC hybrids represents a critical gap in current literature. This review critically examines recent advances in integrated MFC–MEC systems, contrasting their performance and process advantages against standalone devices. It discusses how the electrical output of MFCs can partially offset the energy input required by MECs, facilitating more energy‐efficient biohydrogen production. The review also explores advances in electrode materials, microbial community engineering, and the valorization of diverse wastewater streams, particularly from agrifood and high‐strength industrial sources. By consolidating current findings, this work identifies both the opportunities and limitations associated with integrated BES technologies and outlines research directions needed for their practical implementation.

Xiaoyan Dang, Youzhao Wang, Chaoyue Zhao et al.

Journal of environmental chemical engineering • 2025

Wassim El Housseini, Mathieu Etienne, Élisabeth Lojou et al.

Chemical Engineering and Processing - Process Intensification • 2023

Wanjiang Li, Yule Han, Zhongyi Zhang et al.

Chemical Engineering Journal • 2024

Afef Bohli, R. Bouallegue

IET Wireless Sensor Systems • 2026

ABSTRACT Internet of things (IoT)‐based monitoring in aquaculture presents significant challenges in remote, off‐grid environments where conventional power infrastructure is unavailable. Reliable, continuous and environmentally sustainable energy sources are essential for ensuring autonomous sensor operation and data collection integrity. This study proposes a hybrid energy harvesting system that integrates photovoltaic (PV) panels, lithium‐ion batteries and Microbial Fuel Cells (MFCs) as a novel bioelectrochemical energy source for distributed aquaculture monitoring networks. The MFC subsystem (0.01 L flat‐plate configuration, operating at 4.7 k optimal resistance with optimal generated power up to 6.657 nW) generates bioelectrochemical power for parallel battery supplementation. Experimental evaluation under realistic IoT load conditions demonstrates that the bioelectrochemical‐augmented hybrid system successfully maintains stable autonomous operation while reducing lithium battery discharge burden by 6.1% throughout complete discharge cycles directly extending battery operational lifespan. This reduction decreases electronic waste, minimises carbon footprint through extended battery lifecycle and reduces pollution and environmental burden. This work demonstrates that bioelectrochemical energy integration is technically viable for aquaculture monitoring and similar off‐grid IoT applications, establishing MFCs as a sustainable alternative energy source for greener and more resilient remote sensing infrastructure.

Caio César Gonçalves Silva, Guilherme Martins, André Luís et al.

ACS electrochemistry. • 2025

Photosynthetic microorganisms are promising candidates for sustainable energy production in photobio-electrochemical systems. However, integrating them with electrodes is challenging due to the compartmentalized nature of photosynthetic organelles. Microalgae, in particular, have a more complex cell structure than cyanobacteria, leading to low electron transfer rates and compromising electrochemical communication. In this study, we propose a hybrid biophotoelectrode that integrates intact microalgae cells with a WO 3 semiconductor electrode using polydopamine for cell entrapment and charge transfer enhancement. The biophotoelectrode delivers photocurrents of up to 24 μA cm -2 under visible light illumination with an incident light power below 6.0 mW cm -2 . The photoelectrode performance and the origin of electron flow are investigated, confirming a substantial contribution of immobilized microalgae to the overall photocurrent. We present a proof-of-concept application of the microalgae-based hybrid electrode in combination with a formate dehydrogenase biocathode for the implementation of a biophoto-electrochemical cell for the conversion of CO 2 to formate assisted by light. The system demonstrates the potential for coupling photosynthetic processes with bioelectrochemical conversion, achieving efficient and sustainable production of value-added chemicals. These findings advance our understanding of photosynthetic cell-electrode interactions in hybrid systems, offering insights for developing photobio-electrochemical devices and innovative conversion strategies for waste products.

Yang Yang, Huichuan Zhuang, Han Cui et al.

The Science of The Total Environment • 2020

Nazlı Pelin Kocatürk‐Schumacher, Joana Madjarov, Pavaris Viwatthanasittiphong et al.

Frontiers in Energy Research • 2018

Recently, it has been shown that combining a bioelectrochemical system (BES) with an anaerobic membrane bioreactor (AnMBR) to produce electricity can reduce the overall energy consumption of wastewater treatment. In this study, we tested the recently proposed concept that integrates a microbial anode into an AnMBR, under application relevant conditions, for the treatment of synthetic brewery wastewater. We developed two system configurations: a filtering anode with stainless steel filter plate; and a hybrid anode, in which a polymeric membrane is combined with stainless steel mesh. As fouling is problematic in AnMBRs, we investigated the effect of two fouling mitigation methods, namely electrochemical cleaning and application of a turbulence promotor, on the permeate fluxes and current densities. We also investigated the effect of cathode (counter electrode) position on the permeate fluxes and current densities in filtering and hybrid anode. Our results revealed that permeate fluxes were influenced by the membrane pore size; and dropped below 5 L m −2 hr −1 on day 3 with filter grade 0.5 μm; whereas similar values of permeate flux were observed after 5 days of operation with the membrane with filter grade 0.1 μm. COD removal across the membrane reached up to 644 mg L −1 indicating improvement in energy efficiency and effluent quality of the AnMBR. The location of cathode did not influence permeate fluxes and current densities, but permeate pH was largely affected. Electrochemical cleaning improved permeate fluxes more than 2-fold (18.9 L m −2 hr −1 after 7 days of operation) compared to the operation of the 0.1 μm membrane without a cleaning procedure. Application of a turbulence promotor increased permeate fluxes and current densities in filtering anode. The hybrid anode resulted in similar current densities, but higher permeate fluxes as compared to the filtering anode, which dropped below 20 L m −2 hr −1 only after 8 days of operation. The hybrid anode configuration is an attractive option that combines high permeate fluxes on conventional non-conductive filters with current generation on an inexpensive conductive material. In summary, our results demonstrate that combining BES with AnMBR is a promising approach toward an energy efficient wastewater treatment.

Chengye Wang, Yue Wu, Wei Hu et al.

International Journal of Electrochemical Science • 2020

Bioelectrochemical system (BES) that is self-sufficient was developed to treat nitrate in groundwater, which consists of air cathode microbial fuel cell (MFC) and microbial electrolysis cell (MEC). Without external power, the highest nitrate removal rate and the highest removal efficiency of autotrophic denitrification MFC were 10.6 mg/(L·d) and 56.5%, respectively. However, the highest denitrification rate increased to 13.5 mg/(L·d) when three air cathode MFCs (0.8 V) were adopted in series as the power source for autotrophic denitrification MEC, which was 27.4% higher than that of autotrophic denitrification MFC. In addition, the nitrate removal efficiency was as high as 80.6%, which was the same to that of the conventional biological nitrogen removal (BNR). Thereby, autotrophic denitrification was significantly improved in MFCs-MEC and the hybrid system made BES more feasible in treating low ionic strength water (<1000 μS/cm) like groundwater. Furthermore, excessive organic input to groundwater was avoided by the autotrophic denitrification which might cause secondary pollution to it.

Gizem Civan, Burcu Palas, Gülin Ersöz et al.

Journal of Photochemistry and Photobiology A Chemistry • 2020

Jiao Li, Haoran Liang, Yuanbiao Li et al.

Colloids and Surfaces A Physicochemical and Engineering Aspects • 2023

Teng Cai, Yule Han, Jiayi Wang et al.

Chemical Engineering Journal • 2024

Ziang Min, Qing Tian, Zhuanzhuan Shi et al.

Journal of Power Sources • 2024

Shuai Xiao, Qian Fu, Yanan Zou et al.

Applied Energy • 2020

Panpan Liu, Changyong Zhang, Peng Liang et al.

Bioelectrochemistry • 2018

Aazraa O. Pankan, Kamran Yunus, Adrian C. Fisher

Bioresource Technology • 2019

Jingkai Zhao, Jialing Gao, Xiaoyou Jin et al.

Environmental Pollution • 2022

Oscar Guadarrama‐Pérez, Karen Yarely Bahena-Rabadan, Ulises Dehesa-Carrasco et al.

Environmental Technology • 2020

The coupling of constructed wetlands (CW) to microbial fuel cells (MFC) has become a promising hybrid technology due to its high compatibility to generate electricity and remove pollutants from wastewater. In the present study, the bioelectricity production generated from constructed wetlands-microbial fuel cells (CW-MFCs) was evaluated using four species of shade macrophytes: Aglaonema commutatum , Epipremnum aureum , Dranacaena braunni, and Philodendron cordatum . The CW-MFCs were operated in a continuous upflow mode with a hydraulic retention time (HRT) of 4 d. The systems were fed with synthetic water without an external carbon source. The bioelectrochemical systems were operated under diffuse radiation conditions (shadow). Philodendron cordatum was the macrophyte species that produced a maximum voltage of 103 mV, with a power density of 12.5 mW/m 2 . High voltages were obtained when the diffuse radiation in the CW-MFCs was 3000-4000 µmol . m 2 /s. The maximum production of root exudates was 20.6 mg/L as total organic carbon for the Philodendron cordatum species. Philodendron cordatum was the macrophyte species that obtained high conversion efficiency (0.0014%), compared to other macrophyte species (< 0.0008%). In the CW-MFCs systems it was observed that the bioelectricity production was mainly due to the quantity of the root exudates released into the rhizospheres of the plants.