Pollutant characteristics and size distribution of trace elements during stormwater runoff events
Priority trace elements As, Cu, Cr, Ni, Pb, and Zn are largely present in urban stormwaters and should be controlled due to their impact on water bodies. As it has been observed that there are numerous limitations in the purification performance of roadway stormwater runoff treatment systems, the pa...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-04-01
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| Series: | Environmental Challenges |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667010023000057 |
| _version_ | 1827948313957105664 |
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| author | Du Phuc Tho Dang Liliane Jean-Soro Béatrice Béchet |
| author_facet | Du Phuc Tho Dang Liliane Jean-Soro Béatrice Béchet |
| author_sort | Du Phuc Tho Dang |
| collection | DOAJ |
| description | Priority trace elements As, Cu, Cr, Ni, Pb, and Zn are largely present in urban stormwaters and should be controlled due to their impact on water bodies. As it has been observed that there are numerous limitations in the purification performance of roadway stormwater runoff treatment systems, the particulate size distribution of trace elements was studied extensively to assess the colloidal fractions present in stormwater runoff of a high-traffic roadway site (100 000 vehicles/day). Besides the evaluation of the total Event Mean Concentrations (EMCs) and dissolved concentrations, a complete fractionation scheme of low settling phase of runoff water (<30 µm) was applied to a series of rain events, considering 8 µm and 5 kDa, as relevant cut-offs between particulate/colloidal elements, and colloidal/truly dissolved elements. The intra-event size distribution was also considered to assess the first-flush effect and the variation of the physical speciation. The high-level traffic associated with climatic conditions (rainfall depth) are responsible for very high EMCs for Zn and Cu, together with a significant exceedance of the European environmental water standards (<0.45 µm concentrations). Ni, Cr and Pb are mainly present as particulate and colloidal metals. Therefore, considering a more complete size distribution is relevant for these elements. For As, Cu and Zn, the conventional fractionation at 0.45 µm seems to be sufficient to evaluate the highly mobile fraction. The results also indicate that, while the main particulate load may be collected within the early volumes of the rainfall events (about 30%), the variability of rain intensity during long events induces changes in particulate and colloidal metals in the runoff. The treatment of runoff must then be considered as a whole in view of the variability of trace metal size distribution. This suggests that urban stormwater runoff treatment systems which employ only the settleable fraction are not sufficient to limit the chemical and ecological risks to receiving water bodies. |
| first_indexed | 2024-04-09T12:53:25Z |
| format | Article |
| id | doaj.art-0ffc089126634ab2ac60f6e4dc62a82c |
| institution | Directory Open Access Journal |
| issn | 2667-0100 |
| language | English |
| last_indexed | 2024-04-09T12:53:25Z |
| publishDate | 2023-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Environmental Challenges |
| spelling | doaj.art-0ffc089126634ab2ac60f6e4dc62a82c2023-05-14T04:29:59ZengElsevierEnvironmental Challenges2667-01002023-04-0111100682Pollutant characteristics and size distribution of trace elements during stormwater runoff eventsDu Phuc Tho Dang0Liliane Jean-Soro1Béatrice Béchet2GERS-LEE, Université Gustave Eiffel, Bouguenais F-44344, France; Université Gustave Eiffel, IRSTV, 1 rue de la Noë, Nantes F-44321 Cedex 3, France; Corresponding author at: GERS-LEE, Université Gustave Eiffel, Bouguenais F-44344, France.GERS-LEE, Université Gustave Eiffel, Bouguenais F-44344, France; Université Gustave Eiffel, IRSTV, 1 rue de la Noë, Nantes F-44321 Cedex 3, France; Observatoire des Sciences de l'Univers de Nantes Atlantique (OSUNA), Campus Lombarderie, 2 rue de la Houssinière, Nantes F-44322, FranceGERS-LEE, Université Gustave Eiffel, Bouguenais F-44344, France; Université Gustave Eiffel, IRSTV, 1 rue de la Noë, Nantes F-44321 Cedex 3, France; Observatoire des Sciences de l'Univers de Nantes Atlantique (OSUNA), Campus Lombarderie, 2 rue de la Houssinière, Nantes F-44322, FrancePriority trace elements As, Cu, Cr, Ni, Pb, and Zn are largely present in urban stormwaters and should be controlled due to their impact on water bodies. As it has been observed that there are numerous limitations in the purification performance of roadway stormwater runoff treatment systems, the particulate size distribution of trace elements was studied extensively to assess the colloidal fractions present in stormwater runoff of a high-traffic roadway site (100 000 vehicles/day). Besides the evaluation of the total Event Mean Concentrations (EMCs) and dissolved concentrations, a complete fractionation scheme of low settling phase of runoff water (<30 µm) was applied to a series of rain events, considering 8 µm and 5 kDa, as relevant cut-offs between particulate/colloidal elements, and colloidal/truly dissolved elements. The intra-event size distribution was also considered to assess the first-flush effect and the variation of the physical speciation. The high-level traffic associated with climatic conditions (rainfall depth) are responsible for very high EMCs for Zn and Cu, together with a significant exceedance of the European environmental water standards (<0.45 µm concentrations). Ni, Cr and Pb are mainly present as particulate and colloidal metals. Therefore, considering a more complete size distribution is relevant for these elements. For As, Cu and Zn, the conventional fractionation at 0.45 µm seems to be sufficient to evaluate the highly mobile fraction. The results also indicate that, while the main particulate load may be collected within the early volumes of the rainfall events (about 30%), the variability of rain intensity during long events induces changes in particulate and colloidal metals in the runoff. The treatment of runoff must then be considered as a whole in view of the variability of trace metal size distribution. This suggests that urban stormwater runoff treatment systems which employ only the settleable fraction are not sufficient to limit the chemical and ecological risks to receiving water bodies.http://www.sciencedirect.com/science/article/pii/S2667010023000057Stormwater runoff eventTrace elementsFractionationSize distribution |
| spellingShingle | Du Phuc Tho Dang Liliane Jean-Soro Béatrice Béchet Pollutant characteristics and size distribution of trace elements during stormwater runoff events Environmental Challenges Stormwater runoff event Trace elements Fractionation Size distribution |
| title | Pollutant characteristics and size distribution of trace elements during stormwater runoff events |
| title_full | Pollutant characteristics and size distribution of trace elements during stormwater runoff events |
| title_fullStr | Pollutant characteristics and size distribution of trace elements during stormwater runoff events |
| title_full_unstemmed | Pollutant characteristics and size distribution of trace elements during stormwater runoff events |
| title_short | Pollutant characteristics and size distribution of trace elements during stormwater runoff events |
| title_sort | pollutant characteristics and size distribution of trace elements during stormwater runoff events |
| topic | Stormwater runoff event Trace elements Fractionation Size distribution |
| url | http://www.sciencedirect.com/science/article/pii/S2667010023000057 |
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