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Hexavalent chromium waste removal via bioelectrochemical systems – a life cycle assessment perspective

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 bio...

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Autores principales: Muazu, Rukayya Ibrahim, Sadhukhan, Jhuma, Venkata Mohan, S., Gadkari, Siddharth
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10534287/
https://www.ncbi.nlm.nih.gov/pubmed/38013896
http://dx.doi.org/10.1039/d3ew00344b
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author Muazu, Rukayya Ibrahim
Sadhukhan, Jhuma
Venkata Mohan, S.
Gadkari, Siddharth
author_facet Muazu, Rukayya Ibrahim
Sadhukhan, Jhuma
Venkata Mohan, S.
Gadkari, Siddharth
author_sort Muazu, Rukayya Ibrahim
collection PubMed
description 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.
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spelling pubmed-105342872023-09-29 Hexavalent chromium waste removal via bioelectrochemical systems – a life cycle assessment perspective Muazu, Rukayya Ibrahim Sadhukhan, Jhuma Venkata Mohan, S. Gadkari, Siddharth Environ Sci (Camb) Chemistry 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. The Royal Society of Chemistry 2023-07-31 /pmc/articles/PMC10534287/ /pubmed/38013896 http://dx.doi.org/10.1039/d3ew00344b Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/
spellingShingle Chemistry
Muazu, Rukayya Ibrahim
Sadhukhan, Jhuma
Venkata Mohan, S.
Gadkari, Siddharth
Hexavalent chromium waste removal via bioelectrochemical systems – a life cycle assessment perspective
title Hexavalent chromium waste removal via bioelectrochemical systems – a life cycle assessment perspective
title_full Hexavalent chromium waste removal via bioelectrochemical systems – a life cycle assessment perspective
title_fullStr Hexavalent chromium waste removal via bioelectrochemical systems – a life cycle assessment perspective
title_full_unstemmed Hexavalent chromium waste removal via bioelectrochemical systems – a life cycle assessment perspective
title_short Hexavalent chromium waste removal via bioelectrochemical systems – a life cycle assessment perspective
title_sort hexavalent chromium waste removal via bioelectrochemical systems – a life cycle assessment perspective
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10534287/
https://www.ncbi.nlm.nih.gov/pubmed/38013896
http://dx.doi.org/10.1039/d3ew00344b
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AT venkatamohans hexavalentchromiumwasteremovalviabioelectrochemicalsystemsalifecycleassessmentperspective
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