Role of Seasons in the Fate of Dissolved Organic Carbon and Nutrients in a Large-Scale Surface Flow Constructed Wetland
The role of seasons in the removal of dissolved organic carbon (DOC), nutrients and in changes in the spectral properties of dissolved organic matter (DOM) in a large-scale surface flow constructed wetland (SF-CW) receiving reclaimed water and composed of three basins with different vegetation patte...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-05-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/14/9/1474 |
| _version_ | 1797502445425786880 |
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| author | Nicolas Maurice Cécile Pochet Nouceiba Adouani Marie-Noëlle Pons |
| author_facet | Nicolas Maurice Cécile Pochet Nouceiba Adouani Marie-Noëlle Pons |
| author_sort | Nicolas Maurice |
| collection | DOAJ |
| description | The role of seasons in the removal of dissolved organic carbon (DOC), nutrients and in changes in the spectral properties of dissolved organic matter (DOM) in a large-scale surface flow constructed wetland (SF-CW) receiving reclaimed water and composed of three basins with different vegetation patterns was studied. Dissolved nitrogen removal efficiencies within the three basins in summer (>50%) and winter (<30%) were significantly different. SF-CW water is enriched in DOC in spring and summer with average outlet concentrations above 8 mg·L<sup>−1</sup>. UV-visible indices, such as the specific absorbance at 254 nm or the spectral slope between 275 and 295 nm, did not vary over the seasons; thus, the basins did not change DOM aromaticity and average molecular weight. Synchronous fluorescence spectra showed variations in terms of protein-like and humic-like substances, the latter being more sensitive to photodegradation. A lab-scale photodegradation experiment confirmed that radiation from the sun was responsible for this decrease, showing this process could alter the composition of DOM at full-scale. DOM variations result from a seasonal competition between release by vegetation and photodegradation. These results validate the necessity for long-term monitoring of SF-CWs, and the utility of rapid optical methods to monitor DOC. |
| first_indexed | 2024-03-10T03:33:12Z |
| format | Article |
| id | doaj.art-59ff56309d5b4f8399017ed59c92e548 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T03:33:12Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-59ff56309d5b4f8399017ed59c92e5482023-11-23T09:36:18ZengMDPI AGWater2073-44412022-05-01149147410.3390/w14091474Role of Seasons in the Fate of Dissolved Organic Carbon and Nutrients in a Large-Scale Surface Flow Constructed WetlandNicolas Maurice0Cécile Pochet1Nouceiba Adouani2Marie-Noëlle Pons3Laboratoire Réactions et Génie des Procédés, Université de Lorraine, CNRS, 1 Rue Grandville, CEDEX F-54001, BP 20451 Nancy, FranceGrand Reims, CEDEX F-51000, CS 80036 Reims, FranceLaboratoire Réactions et Génie des Procédés, Université de Lorraine, CNRS, 1 Rue Grandville, CEDEX F-54001, BP 20451 Nancy, FranceLaboratoire Réactions et Génie des Procédés, Université de Lorraine, CNRS, 1 Rue Grandville, CEDEX F-54001, BP 20451 Nancy, FranceThe role of seasons in the removal of dissolved organic carbon (DOC), nutrients and in changes in the spectral properties of dissolved organic matter (DOM) in a large-scale surface flow constructed wetland (SF-CW) receiving reclaimed water and composed of three basins with different vegetation patterns was studied. Dissolved nitrogen removal efficiencies within the three basins in summer (>50%) and winter (<30%) were significantly different. SF-CW water is enriched in DOC in spring and summer with average outlet concentrations above 8 mg·L<sup>−1</sup>. UV-visible indices, such as the specific absorbance at 254 nm or the spectral slope between 275 and 295 nm, did not vary over the seasons; thus, the basins did not change DOM aromaticity and average molecular weight. Synchronous fluorescence spectra showed variations in terms of protein-like and humic-like substances, the latter being more sensitive to photodegradation. A lab-scale photodegradation experiment confirmed that radiation from the sun was responsible for this decrease, showing this process could alter the composition of DOM at full-scale. DOM variations result from a seasonal competition between release by vegetation and photodegradation. These results validate the necessity for long-term monitoring of SF-CWs, and the utility of rapid optical methods to monitor DOC.https://www.mdpi.com/2073-4441/14/9/1474dissolved organic mattersynchronous fluorescence spectrumnitrogensurface flow constructed wetlandUV-visible spectrum |
| spellingShingle | Nicolas Maurice Cécile Pochet Nouceiba Adouani Marie-Noëlle Pons Role of Seasons in the Fate of Dissolved Organic Carbon and Nutrients in a Large-Scale Surface Flow Constructed Wetland Water dissolved organic matter synchronous fluorescence spectrum nitrogen surface flow constructed wetland UV-visible spectrum |
| title | Role of Seasons in the Fate of Dissolved Organic Carbon and Nutrients in a Large-Scale Surface Flow Constructed Wetland |
| title_full | Role of Seasons in the Fate of Dissolved Organic Carbon and Nutrients in a Large-Scale Surface Flow Constructed Wetland |
| title_fullStr | Role of Seasons in the Fate of Dissolved Organic Carbon and Nutrients in a Large-Scale Surface Flow Constructed Wetland |
| title_full_unstemmed | Role of Seasons in the Fate of Dissolved Organic Carbon and Nutrients in a Large-Scale Surface Flow Constructed Wetland |
| title_short | Role of Seasons in the Fate of Dissolved Organic Carbon and Nutrients in a Large-Scale Surface Flow Constructed Wetland |
| title_sort | role of seasons in the fate of dissolved organic carbon and nutrients in a large scale surface flow constructed wetland |
| topic | dissolved organic matter synchronous fluorescence spectrum nitrogen surface flow constructed wetland UV-visible spectrum |
| url | https://www.mdpi.com/2073-4441/14/9/1474 |
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