[object Object], [object Object], [object Object] et al.

Environmental Science Water Research & Technology • 2023

Bioelectrochemical systems (BESs) such as microbial fuel cells (MFCs) present numerous benefits for the removal and recovery of heavy metals from industrial and municipal wastewater. This study evaluated the life cycle environmental impact of simultaneous hexavalent chromium (Cr(vi)) removal and bioelectricity generation in a dual chamber MFC. Results indicate a global warming potential (GWP) of -0.44 kg carbon dioxide (CO 2 )-eq. per kg of chromium recovered, representing a total saving of up to 97% in comparison with existing technologies for the treatment of Cr(vi) laden wastewater. The observed savings in GWP (kg CO 2 -eq.) reduced to 61.8% with the removal of the allocated credits from the MFC system's life cycle. Of all the various sub-systems considered within the chromium waste treatment plant, the MFC unit and the chromium metal recovery unit had the largest impact in terms of GWP (kg CO 2 -eq.), non-renewable energy use (NREU) (MJ primary), and mineral extraction (MJ surplus). A statistical analysis of the results showed that an increase in chemical oxygen demand (COD) was associated with a reduction in GWP (kg CO 2 -eq.), NREU (MJ primary), and terrestrial ecotoxicity (kg triethylene glycol equivalents into soil (TEG soil)-eq.). The life cycle assessment (LCA) output showed a high sensitivity to changes in the materials and construction processes of MFC reactors, indicating the need for further research into sustainable materials for MFC reactor construction. The observed interaction effects of process variables also suggest the need for combined optimization of these variables. Analysis with other types of metals is also important to further demonstrate the practical viability of metal removal through MFCs.

• 0

[object Object], [object Object], [object Object] et al.

ECORFAN eBooks • 2022

• 0

[object Object], [object Object], [object Object] et al.

RSC Advances • 2017

• 0

• 0

[object Object], [object Object], [object Object] et al.

BioResources • 2015

• 0

• 0

[object Object], [object Object], [object Object] et al.

Archives of Acoustics • 2019

[object Object], [object Object], [object Object] et al.

Journal of Agricultural and Food Chemistry • 2023

• 0

• 0

• 0

• 0

[object Object], [object Object], [object Object]

Energy Environ. Sci. • 2013

• 0

[object Object], [object Object]

Polish Journal of Environmental Studies • 2019

• 0

• 0

[object Object], [object Object], [object Object]

AMB Express • 2012

Current-generating (exoelectrogenic) bacteria in bioelectrochemical systems (BESs) may not be culturable using standard in vitro agar-plating techniques, making isolation of new microbes a challenge. More in vivo like conditions are needed where bacteria can be grown and directly isolated on an electrode. While colonies can be developed from single cells on an electrode, the cells must be immobilized after being placed on the surface. Here we present a proof-of-concept immobilization approach that allows exoelectrogenic activity of cells on an electrode based on applying a layer of latex to hold bacteria on surfaces. The effectiveness of this procedure to immobilize particles was first demonstrated using fluorescent microspheres as bacterial analogs. The latex coating was then shown to not substantially affect the exoelectrogenic activity of well-developed anode biofilms in two different systems. A single layer of airbrushed coating did not reduce the voltage produced by a biofilm in a microbial fuel cell (MFC), and more easily applied dip-and-blot coating reduced voltage by only 11% in a microbial electrolysis cell (MEC). This latex immobilization procedure will enable future testing of single cells for exoelectrogenic activity on electrodes in BESs.

[object Object], [object Object], [object Object] et al.

E3S Web of Conferences • 2024

[object Object], [object Object], [object Object] et al.

Membranes • 2023

• 0

[object Object], [object Object], [object Object] et al.

Energies • 2021

[object Object], [object Object], [object Object] et al.

Energies • 2021

[object Object], [object Object]

Biotechnology for Biofuels • 2016

[object Object], [object Object], [object Object] et al.

Enzyme Research • 2014

[object Object], [object Object]

MATEC Web of Conferences • 2018

• 0

[object Object], [object Object]

Bioresources and Bioprocessing • 2016

Due to a growing world population and increasing welfare, energy demand worldwide is increasing. To meet the increasing energy demand in a sustainable way, new technologies are needed. The Plant-Microbial Fuel Cell (P-MFC) is a technology that could produce sustainable bio-electricity and help meeting the increasing energy demand. Power output of the P-MFC, however, needs to be increased to make it attractive as a renewable and sustainable energy source. To increase power output of the P-MFC internal resistances need to be reduced. With a flat-plate P-MFC design we tried to minimize internal resistances compared to the previously used tubular P-MFC design. With the flat-plate design current and power density per geometric planting area were increased (from 0.15 A/m2 to 1.6 A/m2 and from 0.22 W/m2 to and 0.44 W/m2)as were current and power output per volume (from 7.5 A/m3 to 122 A/m3 and from 1.3 W/m3 to 5.8 W/m3). Internal resistances times volume were decreased, even though internal resistances times membrane surface area were not. Since the membrane in the flat-plate design is placed vertically, membrane surface area per geometric planting area is increased, which allows for lower internal resistances times volume while not decreasing internal resistances times membrane surface area. Anode was split into three different sections on different depths of the system, allowing to calculate internal resistances on different depths. Most electricity was produced where internal resistances were lowest and where most roots were present; in the top section of the system. By measuring electricity production on different depths in the system, electricity production could be linked to root growth. This link offers opportunities for material-reduction in new designs. Concurrent reduction in material use and increase in power output brings the P-MFC a step closer to usable energy density and economic feasibility.

[object Object], [object Object], [object Object] et al.

The Science of The Total Environment • 2023

[object Object], [object Object], [object Object] et al.

Toxics • 2023

• 0

• 0

• 0

[object Object], [object Object], [object Object] et al.

Nature Communications • 2021

• 0

[object Object]

Gazi Üniversitesi Fen Bilimleri Dergisi Part C Tasarım ve Teknoloji • 2025