Vortex Impeller-Based Aeration of Groundwater
Iron oxidation and removal from groundwater is a necessary and costly process in drinking water production. In most cases, iron removal is done via aeration, succeeded by precipitation. Most systems for aeration are based on increasing the interfacial area via injecting air in the system or spraying...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-03-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/14/5/795 |
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| author | Maarten V. van de Griend Francis Warrener Meike van den Akker Yanru Song Elmar C. Fuchs Willibald Loiskandl Luewton L. F. Agostinho |
| author_facet | Maarten V. van de Griend Francis Warrener Meike van den Akker Yanru Song Elmar C. Fuchs Willibald Loiskandl Luewton L. F. Agostinho |
| author_sort | Maarten V. van de Griend |
| collection | DOAJ |
| description | Iron oxidation and removal from groundwater is a necessary and costly process in drinking water production. In most cases, iron removal is done via aeration, succeeded by precipitation. Most systems for aeration are based on increasing the interfacial area via injecting air in the system or spraying. Both methods have disadvantages, like clogging and formation of aerosols. In this study, a new vortex-based flow-through reactor consisting of a cylindrical tank with an impeller located at the bottom was studied regarding its aeration and iron oxidation capabilities in groundwater. During the aeration experiments, the flow rate, impeller rotation and aerated volume were varied. A nondimensional constant α was proposed to relate the system’s physical characteristics and its aeration capabilities, expressed in dissolved oxygen and system volumetric mass transfer coefficient (<i>K<sub>L</sub>a</i>). Three distinct operational regimes were defined: formation, complete and bubble regime. These regimes showed very specific characteristics regarding the air–water interface structure and the area to volume ratio, resulting in different aeration capabilities and iron oxidation efficiency values. The system presented <i>K<sub>L</sub>a</i> values similar to commercially available aeration systems, especially inside the bubble regime. By using dimensionless coefficients, the presented analysis provided the basis for the design of continuous impeller aeration and oxidation systems of arbitrary size. |
| first_indexed | 2024-03-09T20:14:11Z |
| format | Article |
| id | doaj.art-07e62be021384c52a9ed32d54e3042c0 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-09T20:14:11Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-07e62be021384c52a9ed32d54e3042c02023-11-24T00:03:24ZengMDPI AGWater2073-44412022-03-0114579510.3390/w14050795Vortex Impeller-Based Aeration of GroundwaterMaarten V. van de Griend0Francis Warrener1Meike van den Akker2Yanru Song3Elmar C. Fuchs4Willibald Loiskandl5Luewton L. F. Agostinho6Wetsus, European Centre of Excellence for Sustainable Water Technology, 8911 MA Leeuwarden, The NetherlandsWetsus, European Centre of Excellence for Sustainable Water Technology, 8911 MA Leeuwarden, The NetherlandsWetsus, European Centre of Excellence for Sustainable Water Technology, 8911 MA Leeuwarden, The NetherlandsWetsus, European Centre of Excellence for Sustainable Water Technology, 8911 MA Leeuwarden, The NetherlandsWetsus, European Centre of Excellence for Sustainable Water Technology, 8911 MA Leeuwarden, The NetherlandsInstitute of Soil Physics and Rural Water Management, University of Natural Resources and Life Sciences, 1190 Vienna, AustriaWetsus, European Centre of Excellence for Sustainable Water Technology, 8911 MA Leeuwarden, The NetherlandsIron oxidation and removal from groundwater is a necessary and costly process in drinking water production. In most cases, iron removal is done via aeration, succeeded by precipitation. Most systems for aeration are based on increasing the interfacial area via injecting air in the system or spraying. Both methods have disadvantages, like clogging and formation of aerosols. In this study, a new vortex-based flow-through reactor consisting of a cylindrical tank with an impeller located at the bottom was studied regarding its aeration and iron oxidation capabilities in groundwater. During the aeration experiments, the flow rate, impeller rotation and aerated volume were varied. A nondimensional constant α was proposed to relate the system’s physical characteristics and its aeration capabilities, expressed in dissolved oxygen and system volumetric mass transfer coefficient (<i>K<sub>L</sub>a</i>). Three distinct operational regimes were defined: formation, complete and bubble regime. These regimes showed very specific characteristics regarding the air–water interface structure and the area to volume ratio, resulting in different aeration capabilities and iron oxidation efficiency values. The system presented <i>K<sub>L</sub>a</i> values similar to commercially available aeration systems, especially inside the bubble regime. By using dimensionless coefficients, the presented analysis provided the basis for the design of continuous impeller aeration and oxidation systems of arbitrary size.https://www.mdpi.com/2073-4441/14/5/795aerationiron oxidationimpellervortexgroundwater treatment |
| spellingShingle | Maarten V. van de Griend Francis Warrener Meike van den Akker Yanru Song Elmar C. Fuchs Willibald Loiskandl Luewton L. F. Agostinho Vortex Impeller-Based Aeration of Groundwater Water aeration iron oxidation impeller vortex groundwater treatment |
| title | Vortex Impeller-Based Aeration of Groundwater |
| title_full | Vortex Impeller-Based Aeration of Groundwater |
| title_fullStr | Vortex Impeller-Based Aeration of Groundwater |
| title_full_unstemmed | Vortex Impeller-Based Aeration of Groundwater |
| title_short | Vortex Impeller-Based Aeration of Groundwater |
| title_sort | vortex impeller based aeration of groundwater |
| topic | aeration iron oxidation impeller vortex groundwater treatment |
| url | https://www.mdpi.com/2073-4441/14/5/795 |
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