{"id":5852,"date":"2020-10-21T05:51:37","date_gmt":"2020-10-21T05:51:37","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5852"},"modified":"2020-10-21T05:52:05","modified_gmt":"2020-10-21T05:52:05","slug":"filtration-efficiency","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/filtration-efficiency\/","title":{"rendered":"Efficacit\u00e9 de filtration"},"content":{"rendered":"

L'efficacit\u00e9 de filtration est le principal indicateur permettant d'\u00e9valuer un milieu filtrant ou un filtre ; elle s'exprime par le rapport entre la masse des solides retenus lors de l'op\u00e9ration de filtration et leur teneur initiale. Les facteurs influen\u00e7ant l'efficacit\u00e9 de filtration des milieux filtrants comprennent les propri\u00e9t\u00e9s de ces derniers ainsi que celles des solides en suspension.<\/p>\n

Influence des mat\u00e9riaux filtrants sur l'efficacit\u00e9 de r\u00e9tention<\/strong><\/p>\n

1) Taille des particules. L'efficacit\u00e9 de filtration est inversement proportionnelle \u00e0 la taille des particules : plus celles-ci sont petites, plus l'efficacit\u00e9 de filtration est \u00e9lev\u00e9e, mais la perte de charge augmente \u00e9galement.<\/p>\n

2) Forme. La surface du mat\u00e9riau angulaire est plus grande que celle du mat\u00e9riau filtrant sph\u00e9rique de m\u00eame volume. Par cons\u00e9quent, \u00e0 porosit\u00e9 \u00e9gale, l'efficacit\u00e9 de filtration du mat\u00e9riau filtrant angulaire est sup\u00e9rieure.<\/p>\n

3) Porosit\u00e9. La porosit\u00e9 des particules sph\u00e9riques mat\u00e9riau filtrant<\/a> n'a que peu de rapport avec la taille des particules. En revanche, la porosit\u00e9 des m\u00e9dias filtrants angulaires d\u00e9pend de la taille des particules et de leur distribution.<\/p>\n

4) \u00c9paisseur. Plus le lit filtrant est \u00e9pais, plus le filtrat est limpide et plus le cycle de fonctionnement est long.<\/p>\n

5) Propri\u00e9t\u00e9s de surface. La charge de surface du mat\u00e9riau filtrant, lorsqu\u2019il est neutre ou pr\u00e9sente une charge oppos\u00e9e \u00e0 celle des particules en suspension, favorise l\u2019adsorption et la condensation par contact de ces particules sur la surface.<\/p>\n

\"Efficacit\u00e9<\/p>\n

Effet des mati\u00e8res en suspension sur l'efficacit\u00e9 de l'interception<\/strong><\/p>\n

1) Taille des particules. Presque tous les m\u00e9canismes de filtration d\u00e9pendent de la taille des mati\u00e8res en suspension. Plus les particules sont grosses, plus elles sont faciles \u00e0 \u00e9liminer par tamisage.<\/p>\n

2) Forme. L'efficacit\u00e9 d'\u00e9limination des particules angulaires est sup\u00e9rieure \u00e0 celle des particules sph\u00e9riques en raison de leur grande surface sp\u00e9cifique.<\/p>\n

3) Densit\u00e9. La densit\u00e9 des particules influe sur la vitesse de filtration principalement par le biais des m\u00e9canismes de pr\u00e9cipitation, d'inertie et de mouvement brownien.<\/p>\n

4) Concentration. Plus la concentration est \u00e9lev\u00e9e, plus la p\u00e9n\u00e9tration est facile et plus la perte de charge augmente rapidement.<\/p>\n

5) Temp\u00e9rature. La temp\u00e9rature influe sur la densit\u00e9 et la viscosit\u00e9, ce qui se r\u00e9percute ensuite sur l'efficacit\u00e9 de la filtration par le biais de m\u00e9canismes de pr\u00e9cipitation et d'adh\u00e9rence. Une baisse de la temp\u00e9rature n'est pas favorable \u00e0 la filtration.<\/p>\n

6) Propri\u00e9t\u00e9s de surface. Les caract\u00e9ristiques de floculation et le potentiel \u00e9lectromoteur des mati\u00e8res en suspension d\u00e9pendent principalement des propri\u00e9t\u00e9s de surface. Par cons\u00e9quent, les propri\u00e9t\u00e9s de surface des particules constituent des facteurs importants qui influent sur l'efficacit\u00e9 de la filtration.<\/p>","protected":false},"excerpt":{"rendered":"

Filtration efficiency is the primary index to evaluate the filter medium or filter, which is expressed by the ratio of the mass of solid captured…<\/p>","protected":false},"author":1,"featured_media":5853,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5852","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nFiltration Efficiency of Filter Media | Filtration Mechanisms<\/title>\n<meta name=\"description\" content=\"The factors affecting the filtration efficiency of filter media include the properties of filter media and suspended solids.\" \/>\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.alalloycasting.com\/fr\/filtration-efficiency\/\" \/>\n<meta property=\"og:locale\" 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