H<sub>2</sub>S Removal from Groundwater by Chemical Free Advanced Oxidation Process Using UV-C/VUV Radiation
Sulfide species may be present in groundwater due to natural processes or due to anthropogenic activity. H<sub>2</sub>S contamination poses odor nuisance and may also lead to adverse health effects. Advanced oxidation processes (AOPs) are considered promising treatments for hydrogen-sulf...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-06-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/26/13/4016 |
| _version_ | 1797528150752624640 |
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| author | Yael Gilboa Yuval Alfiya Sara Sabach Eran Friedler Yael Dubowski |
| author_facet | Yael Gilboa Yuval Alfiya Sara Sabach Eran Friedler Yael Dubowski |
| author_sort | Yael Gilboa |
| collection | DOAJ |
| description | Sulfide species may be present in groundwater due to natural processes or due to anthropogenic activity. H<sub>2</sub>S contamination poses odor nuisance and may also lead to adverse health effects. Advanced oxidation processes (AOPs) are considered promising treatments for hydrogen-sulfide removal from water, but conventional AOPs usually require continuous chemical dosing, as well as post-treatment, when solid catalysts are applied. Vacuum-UV (VUV) radiation can generate ·OH in situ via water photolysis, initiating chemical-free AOP. The present study investigated the applicability of VUV-based AOP for removal of H<sub>2</sub>S both in synthetic solutions and in real groundwater, comparing combined UV-C/VUV and UV-C only radiation in a continuous-flow reactor. In deionized water, H<sub>2</sub>S degradation was much faster under the combined radiation, dominated by indirect photolysis, and indicated the formation of sulfite intermediates that convert to sulfate at high radiation doses. Sulfide was efficiently removed from natural groundwater by the two examined lamps, with no clear preference between them. However, in anoxic conditions, common in sulfide-containing groundwater, a small advantage for the combined lamp was observed. These results demonstrate the potential of utilizing VUV-based AOP for treating H<sub>2</sub>S contamination in groundwater as a chemical-free treatment, which can be especially attractive to remote small treatment facilities. |
| first_indexed | 2024-03-10T09:54:04Z |
| format | Article |
| id | doaj.art-b74d7bc94514433184c3ec01a356829a |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T09:54:04Z |
| publishDate | 2021-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-b74d7bc94514433184c3ec01a356829a2023-11-22T02:28:52ZengMDPI AGMolecules1420-30492021-06-012613401610.3390/molecules26134016H<sub>2</sub>S Removal from Groundwater by Chemical Free Advanced Oxidation Process Using UV-C/VUV RadiationYael Gilboa0Yuval Alfiya1Sara Sabach2Eran Friedler3Yael Dubowski4Faculty of Civil and Environmental Engineering, Technion-Israel Institute of Technology, Haifa 3200, IsraelFaculty of Civil and Environmental Engineering, Technion-Israel Institute of Technology, Haifa 3200, IsraelFaculty of Civil and Environmental Engineering, Technion-Israel Institute of Technology, Haifa 3200, IsraelFaculty of Civil and Environmental Engineering, Technion-Israel Institute of Technology, Haifa 3200, IsraelFaculty of Civil and Environmental Engineering, Technion-Israel Institute of Technology, Haifa 3200, IsraelSulfide species may be present in groundwater due to natural processes or due to anthropogenic activity. H<sub>2</sub>S contamination poses odor nuisance and may also lead to adverse health effects. Advanced oxidation processes (AOPs) are considered promising treatments for hydrogen-sulfide removal from water, but conventional AOPs usually require continuous chemical dosing, as well as post-treatment, when solid catalysts are applied. Vacuum-UV (VUV) radiation can generate ·OH in situ via water photolysis, initiating chemical-free AOP. The present study investigated the applicability of VUV-based AOP for removal of H<sub>2</sub>S both in synthetic solutions and in real groundwater, comparing combined UV-C/VUV and UV-C only radiation in a continuous-flow reactor. In deionized water, H<sub>2</sub>S degradation was much faster under the combined radiation, dominated by indirect photolysis, and indicated the formation of sulfite intermediates that convert to sulfate at high radiation doses. Sulfide was efficiently removed from natural groundwater by the two examined lamps, with no clear preference between them. However, in anoxic conditions, common in sulfide-containing groundwater, a small advantage for the combined lamp was observed. These results demonstrate the potential of utilizing VUV-based AOP for treating H<sub>2</sub>S contamination in groundwater as a chemical-free treatment, which can be especially attractive to remote small treatment facilities.https://www.mdpi.com/1420-3049/26/13/4016hydrogen sulfideadvanced oxidation process (AOP)vacuum-UV (VUV)photo-oxidationgroundwaterwater treatment |
| spellingShingle | Yael Gilboa Yuval Alfiya Sara Sabach Eran Friedler Yael Dubowski H<sub>2</sub>S Removal from Groundwater by Chemical Free Advanced Oxidation Process Using UV-C/VUV Radiation Molecules hydrogen sulfide advanced oxidation process (AOP) vacuum-UV (VUV) photo-oxidation groundwater water treatment |
| title | H<sub>2</sub>S Removal from Groundwater by Chemical Free Advanced Oxidation Process Using UV-C/VUV Radiation |
| title_full | H<sub>2</sub>S Removal from Groundwater by Chemical Free Advanced Oxidation Process Using UV-C/VUV Radiation |
| title_fullStr | H<sub>2</sub>S Removal from Groundwater by Chemical Free Advanced Oxidation Process Using UV-C/VUV Radiation |
| title_full_unstemmed | H<sub>2</sub>S Removal from Groundwater by Chemical Free Advanced Oxidation Process Using UV-C/VUV Radiation |
| title_short | H<sub>2</sub>S Removal from Groundwater by Chemical Free Advanced Oxidation Process Using UV-C/VUV Radiation |
| title_sort | h sub 2 sub s removal from groundwater by chemical free advanced oxidation process using uv c vuv radiation |
| topic | hydrogen sulfide advanced oxidation process (AOP) vacuum-UV (VUV) photo-oxidation groundwater water treatment |
| url | https://www.mdpi.com/1420-3049/26/13/4016 |
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