{"id":34003,"date":"2013-01-30T15:40:59","date_gmt":"2013-01-30T13:40:59","guid":{"rendered":"http:\/\/staging.sillon38.com\/?p=34003"},"modified":"2013-01-30T15:40:59","modified_gmt":"2013-01-30T13:40:59","slug":"linnovation-au-service-du-traitement-des-eaux","status":"publish","type":"post","link":"https:\/\/www.sillon38.com\/blog\/2013\/01\/30\/linnovation-au-service-du-traitement-des-eaux\/","title":{"rendered":"L\u2019innovation au service du traitement des eaux"},"content":{"rendered":"<p><span style=\"color: #000080;\"><strong>La M\u00e9tro s\u2019est engag\u00e9e dans un programme d\u2019investissement de la station de d\u00e9pollution Aquapole, situ\u00e9e sur la commune du Fontanil\u00a0 pour am\u00e9liorer le traitement de l\u2019eau, produire et valoriser du \u00ab\u00a0biogaz\u00a0\u00bb\u00e0 partir des boues d\u2019\u00e9puration, r\u00e9duire les odeurs, pour le plus grand b\u00e9n\u00e9fice des 460 000 habitants raccord\u00e9s qui vivent sur les 55 communes concern\u00e9es.<\/strong><\/span><\/p>\n<p><span style=\"color: #000080;\"> <\/span><\/p>\n<p><span style=\"color: #000080;\"><strong>84 millions de m3 d\u2019eaux trait\u00e9s en 2012.<\/strong><\/span><\/p>\n<p><span style=\"color: #000080;\"> <\/span><\/p>\n<p><span style=\"color: #000080;\">Situ\u00e9e sur la commune du Fontanil, la station d&rsquo;assainissement de la M\u00e9tro, \u00ab\u00a0Aquap\u00f4le\u00a0\u00bb,<br \/>\nre\u00e7oit chaque jour quelques 230 000 m3 d\u2019eaux usag\u00e9es produites par les habitants et les<br \/>\nentreprises, pour les d\u00e9polluer avant leur rejet en milieu naturel.<\/span><\/p>\n<p><span style=\"color: #000080;\"> <\/span><\/p>\n<p><span style=\"color: #000080;\"><strong>Premi\u00e8re nouveaut\u00e9, un traitement compl\u00e9mentaire de la pollution, dit \u201c nitrification\u201d.<\/strong><br \/>\nCe proc\u00e9d\u00e9 fait appel \u00e0 des bact\u00e9ries qui vont d\u00e9barrasser les eaux trait\u00e9es rejet\u00e9es dans<br \/>\nl\u2019is\u00e8re de l\u2019azote qu\u2019elles contiennent en les transformant en mati\u00e8res \u00e0 d\u00e9canter,<br \/>\nr\u00e9cup\u00e9rables sous forme de boues (8243 tonnes de mati\u00e8re s\u00e8che retenues en 2012).<br \/>\n<strong>Probl\u00e8me :<\/strong> le four dans lequel sont aujourd\u2019hui incin\u00e9r\u00e9es ces boues est \u00e0 sa capacit\u00e9<br \/>\nmaximale, l\u2019exc\u00e9dent est trait\u00e9 \u00e0 l\u2019ext\u00e9rieur sous forme de compost. Il faut donc<br \/>\ntrouver une issue \u00e0 ces boues suppl\u00e9mentaires.<\/span><\/p>\n<p><span style=\"color: #000080;\"> <\/span><\/p>\n<p><span style=\"color: #000080;\">C\u2019est l\u2019objet du deuxi\u00e8me volet de ce programme, qui pr\u00e9voit la <strong>mise en place du<br \/>\nprincipe de m\u00e9thanisation<\/strong>. Un traitement enti\u00e8rement biologique permettant de<br \/>\ndiminuer la masse de boues s\u00e9ch\u00e9es de 30% environ. La m\u00e9thanisation a un autre<br \/>\natout. Elle produit une source d\u2019\u00e9nergie stockable, renouvelable et valorisable8: le<br \/>\nbiogaz. Cette nouvelle \u00e9nergie profitera d\u2019abord \u00e0 Aquapole puisqu\u2019elle se<br \/>\nsubstituera au fioul utilis\u00e9 quotidiennement pour l\u2019incin\u00e9rateur. L\u2019exc\u00e9dent pourrait<br \/>\nensuite \u00eatre inject\u00e9 dans le r\u00e9seau de gaz naturel urbain apr\u00e8s purification, ce qui<br \/>\nconstituerait une premi\u00e8re en France.<\/span><\/p>\n<p><span style=\"color: #000080;\"> <\/span><\/p>\n<p><span style=\"color: #000080;\">Un gisement estim\u00e9 \u00e0 128millions de KWh\/an, soit l\u2019\u00e9quivalent des d\u00e9penses<br \/>\n\u00e9nerg\u00e9tiques d\u2019environ 1,000 logements de 70,m2.<\/span><\/p>\n<p><span style=\"color: #000080;\"> <\/span><\/p>\n<p><span style=\"color: #000080;\"><strong>Dernier chantier, la r\u00e9duction des odeurs.<\/strong> C\u2019est la nuit, le matin et en soir\u00e9e<br \/>\nqu\u2019elles sont les plus marqu\u00e9es lorsque l\u2019on circule sur l\u2019autoroute aux alentours<br \/>\nd\u2019Aquapole. Bien que la configuration des lieux et des vents pr\u00e9serve les habitations<br \/>\ndes nuisances, la M\u00e9tro a jug\u00e9 important de r\u00e9duire s\u00e9v\u00e8rement les concentrations<br \/>\nd\u2019odeurs sur le site lui m\u00eame et \u00e0 proximit\u00e9.<\/span><\/p>\n<p><span style=\"color: #000080;\"> <\/span><\/p>\n<p><span style=\"color: #000080;\"><strong>La solution<\/strong> : une couverture des bassins de d\u00e9cantation, aujourd\u2019hui \u00e0 ciel ouvert, qui<br \/>\npermettra de \u201cpi\u00e9ger\u201d les odeurs pour soumettre ensuite l\u2019air extrait \u00e0 un proc\u00e9d\u00e9 de<br \/>\nd\u00e9sodorisation pouss\u00e9.<\/span><\/p>\n<p><span style=\"color: #000080;\"> <\/span><\/p>\n<p><span style=\"color: #000080;\"><strong>Une technique in\u00e9dite<\/strong> : la r\u00e9alisation par coffrage glissant des m\u00e9thaniseurs (25m<br \/>\nde diam\u00e8tre, 20 m de haut) est de 10 jours au lieu de 4 mois, r\u00e9duisant les d\u00e9lais et les<br \/>\nrisques de fuite gr\u00e2ce \u00e0 un b\u00e9tonnage monobloc.<\/span><\/p>\n<p><span style=\"color: #000080;\"> <\/span><\/p>\n<p><span style=\"color: #000080;\">Ce sont au total de 100 \u00e0 150 personnes tous corps d&rsquo;\u00e9tat qui travaillent ou vont travailler sur ce chantier.<\/span><\/p>\n<p><span style=\"color: #000080;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-34008\" title=\"la m\u00e9tro\" src=\"http:\/\/staging.sillon38.com\/wp-content\/uploads\/2013\/01\/la-metro5.png\" alt=\"la m\u00e9tro\" width=\"317\" height=\"293\" srcset=\"https:\/\/www.sillon38.com\/blog\/wp-content\/uploads\/2013\/01\/la-metro5.png 317w, https:\/\/www.sillon38.com\/blog\/wp-content\/uploads\/2013\/01\/la-metro5-300x277.png 300w\" sizes=\"auto, (max-width: 317px) 100vw, 317px\" \/><br \/>\n<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>La M\u00e9tro s\u2019est engag\u00e9e dans un programme d\u2019investissement de la station de d\u00e9pollution Aquapole, situ\u00e9e sur la commune du Fontanil.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,16,37,38],"tags":[489,3245,3355],"class_list":["post-34003","post","type-post","status-publish","format-standard","hentry","category-a-la-une","category-eau","category-la-metro","category-la-metro-la-metro","tag-aquapole","tag-la-metro","tag-le-fontanil"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>L\u2019innovation au service du traitement des eaux -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sillon38.com\/blog\/2013\/01\/30\/linnovation-au-service-du-traitement-des-eaux\/\" \/>\n<meta property=\"og:locale\" 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