File:Aa sphaérotylus doigt fl.jpg

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Français : Filasse bactérienne (sphaerotilus natans en grande partie), tapissant le fond la rivière Aa (ici à Blendecques, dans le Pas-de-calais, dans le Nord de la France, en aval de plusieurs rejets industriels papetiers et urbains mal épurés, phénomène constant dans les années 1980, jusqu'au début des années 1990, qui s'est réglé avec la mise en place de plusieurs stations d'épuration, avec l'aide de l'Agence de l'eau Artois Picardie. Ce type de bactérie (résistant à des températures de 40°C et à certains biocides) est souvent indicatrice d'une pollution grave et chronique par des papeteries ou abattoirs rejetant des effluents pas ou mal épurées, riches en sucres ou matières organiques.
English: bacterian pollution (mostly sphaerotilus natans) of river Aa (north of France) because of pollution from paper plants.
Date fin des années 1980
Source Own work
Author Lamiot

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Date/TimeThumbnailDimensionsUserComment
current16:53, 1 October 2011Thumbnail for version as of 16:53, 1 October 2011672 × 756 (233 KB)Ras67 (talk | contribs)losslessly cropped with Jpegcrop
18:21, 4 December 2007Thumbnail for version as of 18:21, 4 December 2007689 × 771 (245 KB)Lamiot (talk | contribs){{Information |Description= {{fr}} Filasse bactérienne, tapissant le fond la rivière Aa (ici à Blendecques, dans le Pas de calais, Nord de la Franceà, en aval de plusieurs rejets industriels papetiers et urbains mal épurés, phénomène constant dan

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