File:AccumulationMoussePollutionDeûleEcluseGrandCarré avril 2018A75.jpg
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Français : Détail de la surface d'une accumulation de mousse sur la rivière canalisée Deûle en aval de Lille dans le Nord de la France (ici juste en aval de l'écluse du Grand-carré, en sortie de Lille, à la hauteur de Saint-André). Cette mousse est un indice de pollution organique et/ou chimique ; elle peut faire évoquer la présence d'un détergent ou produit similaire dans l'eau (amonium quaternaire..).
Le phénomène se produit encore épisodiquement, parfois accompagné d'une odeur particulière.
Dans les années 1960, il était beaucoup plus fréquent et intense, et les couches de mousses pouvaient dépasser 1 voire 2 m d'épaisseur. A cette époque, il n'y avait pas de station d'épuration dans cette zone et la couche de mousse était beaucoup plus importante. English: Detail of the surface of an accumulation of foam on the canalized river Deûle downstream of Lille in the North of France (here just downstream of the lock of the Grand-carré, at the exit of Lille, near Saint-André). This foam is an index of organic and/or chemical pollution; it can evoke the presence of a detergent or similar product in the water (quaternary ammonia, etc.).
This phenomenon still occurs episodically, sometimes accompanied by a particular smell. In the 1960s, it was much more frequent and intense, and the layers of foam could exceed 1 or even 2 m in thickness. At that time, there was no sewage treatment plant in this area and the layer of foam was much greater. |
| Date | |
| Source | Own work |
| Author | Lamiot |
| Camera location |  | View this and other nearby images on: OpenStreetMap |  |
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| current | 10:36, 12 April 2018 | | 4,608 × 2,688 (2.19 MB) | Lamiot (talk | contribs) | User created page with UploadWizard |
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