{"id":1815,"date":"2022-10-06T15:50:03","date_gmt":"2022-10-06T13:50:03","guid":{"rendered":"https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/?p=1815"},"modified":"2022-11-18T09:01:08","modified_gmt":"2022-11-18T08:01:08","slug":"les-stl-sciences-et-technologies-de-laboratoire-station-epuration-kerolay","status":"publish","type":"post","link":"https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/les-stl-sciences-et-technologies-de-laboratoire-station-epuration-kerolay\/","title":{"rendered":"Les STL vous disent tout sur la station d\u2019\u00e9puration de K\u00e9rolay"},"content":{"rendered":"<p>Les \u00e9l\u00e8ves de 1\u00e8re et terminale<strong><a href=\"https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/formations\/bac-technologique\/\" target=\"_blank\" rel=\"noopener\"> STL (sciences et technologies de laboratoire)<\/a><\/strong> ont eu l\u2019opportunit\u00e9 de visiter la station d\u2019\u00e9puration rue Fran\u00e7ois Toullec, \u00e0 Lorient, pr\u00e8s de La Base, ce mardi 4 octobre. Accueilli par Patrick Le Bars responsable du site et V\u00e9ronique Le Gall technicienne du laboratoire d\u2019analyse de la station, ils ont pu comprendre les \u00e9tapes de traitement des eaux us\u00e9es avant de visiter les installations.<\/p>\n<p><a href=\"https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/les-stl-vous-disent-tout-sur-la-station-depuration-de-kerolay\/img_0628\/\" rel=\"attachment wp-att-1818\"><img decoding=\"async\" class=\"alignnone size-full wp-image-1818\" src=\"https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/wp-content\/uploads\/sites\/3\/2022\/10\/IMG_0628-scaled.jpg\" alt=\"\" width=\"2560\" height=\"1920\" srcset=\"https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/wp-content\/uploads\/sites\/3\/2022\/10\/IMG_0628-scaled.jpg 2560w, https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/wp-content\/uploads\/sites\/3\/2022\/10\/IMG_0628-300x225.jpg 300w, https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/wp-content\/uploads\/sites\/3\/2022\/10\/IMG_0628-1024x768.jpg 1024w, https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/wp-content\/uploads\/sites\/3\/2022\/10\/IMG_0628-768x576.jpg 768w, https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/wp-content\/uploads\/sites\/3\/2022\/10\/IMG_0628-1536x1152.jpg 1536w, https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/wp-content\/uploads\/sites\/3\/2022\/10\/IMG_0628-2048x1536.jpg 2048w, https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/wp-content\/uploads\/sites\/3\/2022\/10\/IMG_0628-1200x900.jpg 1200w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><\/a><\/p>\n<h2>Une station d&rsquo;\u00e9puration n&rsquo;est pas une station d&rsquo;eau potable<\/h2>\n<p><strong>Attention aux id\u00e9es re\u00e7ues<\/strong>, une station d\u2019\u00e9puration n\u2019est pas une station d\u2019eau potable :<\/p>\n<ul>\n<li>Oui, elle re\u00e7oit l\u2019eau de nos toilettes, machine \u00e0 laver, lave vaisselle, \u00e9vier, douches,\u2026<\/li>\n<li>Non, l\u2019eau trait\u00e9e n\u2019est pas renvoy\u00e9e dans le r\u00e9seau d\u2019eau potable, mais elle est rejet\u00e9e dans la mer.<\/li>\n<\/ul>\n<p>La premi\u00e8re \u00e9tape de pr\u00e9-traitement de l\u2019eau est <strong>le d\u00e9grillage<\/strong> : l\u2019eau sale arrive sur des grilles qui vont retenir les gros d\u00e9chets.<\/p>\n<p>Ensuite viennent <strong>le dessablage et le d\u00e9shuilage.<\/strong> Par d\u00e9cantation, le sable se retrouve au fond de la cuve et par flottation les graisses au dessus de l\u2019eau. Le sable ainsi r\u00e9cup\u00e9r\u00e9 peut \u00eatre utilis\u00e9 pour faire de la brique ou encore des enrob\u00e9s de route (pas avec celui de la step de Lorient). Et oui, les stations d\u2019\u00e9puration sont des pr\u00e9curseurs dans le d\u00e9veloppement durable.<\/p>\n<p>Arrive enfin <strong>le traitement de l\u2019eau.<\/strong> Dans de grandes cuves, l\u2019eau va \u00eatre mise en contact de <strong>microorganismes<\/strong> tels que des n\u00e9matodes et autres protozoaires,<strong> c\u2019est le traitement biologique<\/strong>. Ces microorganismes vont permettre la transformation de l\u2019ammoniac en azote gazeux de l\u2019eau et pour se d\u00e9velopper ils vont consommer les substances dont on veut se d\u00e9barrasser : le phosphore (P) et le carbone (C) entre autre. Pour cela on a juste \u00e0 leur fournir un peu d\u2019oxyg\u00e8ne : c\u2019est comme un grand bior\u00e9acteur \u00e0 ciel ouvert avec des tas de sondes et de capteurs.<\/p>\n<p>A l\u2019issue de cette \u00e9tape, il va y avoir une nouvelle d\u00e9cantation, c\u2019est<strong> la clarification<\/strong>, avec apparition de boues au fond du bassin. L\u2019eau sera ensuite rejet\u00e9e dans la mer apr\u00e8s avoir subi de multiples contr\u00f4les (taux de nitrate, phosphate, pH, \u2026).<\/p>\n<p>Les boues quant \u00e0 elles vont \u00eatre<strong> d\u00e9shydrat\u00e9es par centrifugation<\/strong> avant d\u2019\u00eatre utilis\u00e9es pour faire de l\u2019\u00e9pandage ou du compost : encore du d\u00e9veloppement durable!<\/p>\n<p>Cette visite s&rsquo;int\u00e8gre au programme des lyc\u00e9ens inscrits en s\u00e9rie technologique de STL.<\/p>\n<p><a href=\"https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/les-stl-vous-disent-tout-sur-la-station-depuration-de-kerolay\/img_0618\/\" rel=\"attachment wp-att-1816\"><img decoding=\"async\" class=\"alignnone size-full wp-image-1816\" src=\"https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/wp-content\/uploads\/sites\/3\/2022\/10\/IMG_0618-scaled.jpg\" alt=\"\" width=\"2560\" height=\"1920\" srcset=\"https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/wp-content\/uploads\/sites\/3\/2022\/10\/IMG_0618-scaled.jpg 2560w, https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/wp-content\/uploads\/sites\/3\/2022\/10\/IMG_0618-300x225.jpg 300w, https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/wp-content\/uploads\/sites\/3\/2022\/10\/IMG_0618-1024x768.jpg 1024w, https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/wp-content\/uploads\/sites\/3\/2022\/10\/IMG_0618-768x576.jpg 768w, https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/wp-content\/uploads\/sites\/3\/2022\/10\/IMG_0618-1536x1152.jpg 1536w, https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/wp-content\/uploads\/sites\/3\/2022\/10\/IMG_0618-2048x1536.jpg 2048w, https:\/\/saintlouis-lapaix.com\/lycee-saint-louis\/wp-content\/uploads\/sites\/3\/2022\/10\/IMG_0618-1200x900.jpg 1200w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les \u00e9l\u00e8ves de 1\u00e8re et terminale STL (sciences et technologies de laboratoire) ont eu l\u2019opportunit\u00e9 de visiter la station d\u2019\u00e9puration&hellip;<\/p>\n","protected":false},"author":12,"featured_media":1817,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[20],"tags":[],"class_list":["post-1815","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stl"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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