Acidification-based direct electrolysis of treated wastewater for hydrogen production and water reuse
This report describes the direct electrolysis of treated wastewater (as a catholyte) to produce hydrogen and potentially reuse the water. To suppress the negative shift of the cathodic potential due to an increase in pH by the hydrogen evolution reaction (HER), the treated wastewater is acidified us...
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ftdoajarticles:oai:doaj.org/article:3e8e74ede08843aea10d290265af1c99 2023-12-03T10:28:28+01:00 Acidification-based direct electrolysis of treated wastewater for hydrogen production and water reuse Ji-Hyung Han Jeongwook Bae Joohyun Lim Eunjin Jwa Joo-Youn Nam Kyo Sik Hwang Namjo Jeong Jiyeon Choi Hanki Kim Youn-Cheul Jeung 2023-10-01T00:00:00Z https://doi.org/10.1016/j.heliyon.2023.e20629 https://doaj.org/article/3e8e74ede08843aea10d290265af1c99 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S2405844023078374 https://doaj.org/toc/2405-8440 2405-8440 doi:10.1016/j.heliyon.2023.e20629 https://doaj.org/article/3e8e74ede08843aea10d290265af1c99 Heliyon, Vol 9, Iss 10, Pp e20629- (2023) Treated wastewater Seawater Acidification Bipolar membrane Inorganic precipitation Low-grade water electrolysis Science (General) Q1-390 Social sciences (General) H1-99 article 2023 ftdoajarticles https://doi.org/10.1016/j.heliyon.2023.e20629 2023-11-05T01:43:34Z This report describes the direct electrolysis of treated wastewater (as a catholyte) to produce hydrogen and potentially reuse the water. To suppress the negative shift of the cathodic potential due to an increase in pH by the hydrogen evolution reaction (HER), the treated wastewater is acidified using the synergetic effect of protons generated from the bipolar membrane and inorganic precipitation occurred at the surface of the cathode during the HER. Natural seawater, as an accessible source for Mg2+ ions, was added to the treated wastewater because the concentration of Mg2+ ions contained in the original wastewater was too low for acidification to occur. The mixture of treated wastewater with seawater was acidified to pH 3, allowing the initial cathode potential to be maintained for more than 100 h. The amount of inorganic precipitates formed on the cathode surface is greater than that in the control case (adding 0.5 M NaCl instead of seawater) but does not adversely affect the cathodic potential and Faradaic efficiency for H2 production. Additionally, it was confirmed that less organic matter was adsorbed to the inorganic deposits under acidic conditions. These indicate that acidification plays an important role in improving the performance and stability of low-grade water electrolysis. Considering that the treated wastewater is discharged near the ocean, acidification-based electrolysis of the effluent with seawater can be a water reuse technology for green hydrogen production, enhancing water resilience and contributing to the circular economy of water resources. Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Heliyon 9 10 e20629 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Treated wastewater Seawater Acidification Bipolar membrane Inorganic precipitation Low-grade water electrolysis Science (General) Q1-390 Social sciences (General) H1-99 |
spellingShingle |
Treated wastewater Seawater Acidification Bipolar membrane Inorganic precipitation Low-grade water electrolysis Science (General) Q1-390 Social sciences (General) H1-99 Ji-Hyung Han Jeongwook Bae Joohyun Lim Eunjin Jwa Joo-Youn Nam Kyo Sik Hwang Namjo Jeong Jiyeon Choi Hanki Kim Youn-Cheul Jeung Acidification-based direct electrolysis of treated wastewater for hydrogen production and water reuse |
topic_facet |
Treated wastewater Seawater Acidification Bipolar membrane Inorganic precipitation Low-grade water electrolysis Science (General) Q1-390 Social sciences (General) H1-99 |
description |
This report describes the direct electrolysis of treated wastewater (as a catholyte) to produce hydrogen and potentially reuse the water. To suppress the negative shift of the cathodic potential due to an increase in pH by the hydrogen evolution reaction (HER), the treated wastewater is acidified using the synergetic effect of protons generated from the bipolar membrane and inorganic precipitation occurred at the surface of the cathode during the HER. Natural seawater, as an accessible source for Mg2+ ions, was added to the treated wastewater because the concentration of Mg2+ ions contained in the original wastewater was too low for acidification to occur. The mixture of treated wastewater with seawater was acidified to pH 3, allowing the initial cathode potential to be maintained for more than 100 h. The amount of inorganic precipitates formed on the cathode surface is greater than that in the control case (adding 0.5 M NaCl instead of seawater) but does not adversely affect the cathodic potential and Faradaic efficiency for H2 production. Additionally, it was confirmed that less organic matter was adsorbed to the inorganic deposits under acidic conditions. These indicate that acidification plays an important role in improving the performance and stability of low-grade water electrolysis. Considering that the treated wastewater is discharged near the ocean, acidification-based electrolysis of the effluent with seawater can be a water reuse technology for green hydrogen production, enhancing water resilience and contributing to the circular economy of water resources. |
format |
Article in Journal/Newspaper |
author |
Ji-Hyung Han Jeongwook Bae Joohyun Lim Eunjin Jwa Joo-Youn Nam Kyo Sik Hwang Namjo Jeong Jiyeon Choi Hanki Kim Youn-Cheul Jeung |
author_facet |
Ji-Hyung Han Jeongwook Bae Joohyun Lim Eunjin Jwa Joo-Youn Nam Kyo Sik Hwang Namjo Jeong Jiyeon Choi Hanki Kim Youn-Cheul Jeung |
author_sort |
Ji-Hyung Han |
title |
Acidification-based direct electrolysis of treated wastewater for hydrogen production and water reuse |
title_short |
Acidification-based direct electrolysis of treated wastewater for hydrogen production and water reuse |
title_full |
Acidification-based direct electrolysis of treated wastewater for hydrogen production and water reuse |
title_fullStr |
Acidification-based direct electrolysis of treated wastewater for hydrogen production and water reuse |
title_full_unstemmed |
Acidification-based direct electrolysis of treated wastewater for hydrogen production and water reuse |
title_sort |
acidification-based direct electrolysis of treated wastewater for hydrogen production and water reuse |
publisher |
Elsevier |
publishDate |
2023 |
url |
https://doi.org/10.1016/j.heliyon.2023.e20629 https://doaj.org/article/3e8e74ede08843aea10d290265af1c99 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Heliyon, Vol 9, Iss 10, Pp e20629- (2023) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S2405844023078374 https://doaj.org/toc/2405-8440 2405-8440 doi:10.1016/j.heliyon.2023.e20629 https://doaj.org/article/3e8e74ede08843aea10d290265af1c99 |
op_doi |
https://doi.org/10.1016/j.heliyon.2023.e20629 |
container_title |
Heliyon |
container_volume |
9 |
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10 |
container_start_page |
e20629 |
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1784253146121371648 |