{"id":316,"date":"2016-11-08T11:03:26","date_gmt":"2016-11-08T10:03:26","guid":{"rendered":"http:\/\/www.serresvaldeloire.com\/actus-conseils\/?p=316"},"modified":"2025-03-24T12:53:44","modified_gmt":"2025-03-24T11:53:44","slug":"regulation-ph-eau-reseau-pression","status":"publish","type":"post","link":"https:\/\/www.serresvaldeloire.com\/actus-conseils\/irrigation\/traitement-de-leau\/regulation-ph-eau-reseau-pression\/","title":{"rendered":"R\u00e9gulation du pH – r\u00e9seaux sous pression"},"content":{"rendered":"\t\t
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L’utilisation d’eau \u00e0 bas pH favorise l’efficacit\u00e9 des engrais<\/strong> et permet une r\u00e9duction de la concentration appliqu\u00e9e pour un m\u00eame effet.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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On peut contr\u00f4ler le pH de l’eau \u00e0 travers un dosage pr\u00e9cis d’acide nitrique ou phosphorique<\/strong>, de fa\u00e7on proportionnelle ou gr\u00e2ce \u00e0 une sonde pH.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Nous vous donnons davantage de renseignements ci-dessous.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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D\u00e9finition du pH<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Le ph est le potentiel hydrog\u00e8ne<\/em>. Il d\u00e9signe et permet de mesurer l’acidit\u00e9 ou la basicit\u00e9 d’une solution. Une eau pure poss\u00e8de un pH de 7, \u00e0 25\u00b0c. C’est le \u00ab\u00a0point neutre\u00a0\u00bb, la r\u00e9f\u00e9rence.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Le pH neutre est donc \u00e0 7<\/strong>, les mesures de pH inf\u00e9rieures \u00e9voquent un pH acides, les mesures sup\u00e9rieures un pH basique.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Acide ? Basique ?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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La valeur pH est directement li\u00e9e \u00e0 la concentration de celle-ci en ions oxonium H30+, qui proviennent de la fixation d’un proton H+ sur une mol\u00e9cule d’eau H2O.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Un milieu acide<\/strong> poss\u00e8de donc une forte concentration en ions oxonium. Une solution aqueuse est ainsi consid\u00e9r\u00e9e comme acide si elle contient plus d’ions H30+ que l’eau pure.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Un milieu basique (pH \u00e9lev\u00e9)<\/strong> poss\u00e8de des ions hydroxydes HO-. Elle est consid\u00e9r\u00e9e basique si elle contient plus d’ions HO- que l’eau pure.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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En r\u00e8gle g\u00e9n\u00e9rale, l’ajout d’un acide diminue le pH d’une solution neutre ou basique, et l’ajout d’une base augmente le pH d’une solution acide ou neutre.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Facteurs influen\u00e7ant le pH<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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De nombreux facteurs influencent le pH, qui est un reflet de l’\u00e9tat de la solution :<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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  1. Facteurs physiques : \u00e9clairage, temp\u00e9rature<\/li>
  2. Facteurs chimiques : CO2, O2 dissous<\/li>
  3. Facteurs biologiques : faune et flore<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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    Types de r\u00e9gulation du pH<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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    Dans le process<\/em> de traitement des eaux<\/a> pour la pr\u00e9paration de bouillies phytosanitaires, plusieurs types de r\u00e9gulation sont possibles.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    Nous vous les d\u00e9taillons ci-dessous, mais sachez qu’une autre solution consiste \u00e0 utiliser des doseurs proportionnels.<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    SVL Irrigation est en mesure de mettre en oeuvre toutes ces techniques sur vos chantiers.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    R\u00e9gulation de pH en ligne : injection proportionnelle<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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    L’injection d’acide se fait proportionnellement au d\u00e9bit d’eau.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    La quantit\u00e9 d’acide \u00e0 injecter est alors calcul\u00e9e th\u00e9oriquement et fix\u00e9e sur l’appareil de contr\u00f4le.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    De faibles variations de pH sont tol\u00e9r\u00e9es.<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    R\u00e9gulation de pH en ligne : injection proportionnelle, sonde pH<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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    L’injection d’acide se fait proportionnellement au d\u00e9bit d’eau avec le contr\u00f4le en ligne de la valeur de pH.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    Le contr\u00f4le via sonde pH permet d’affiner et d’obtenir un pH de l’eau stable et pr\u00e9cis<\/strong>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    R\u00e9gulation du pH<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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    La d\u00e9termination de la quantit\u00e9 d’acide \u00e0 apporter pour descendre le pH d’une eau<\/strong> d’un point ne peut \u00eatre exacte sans une connaissance approfondie de ses caract\u00e9ristiques et des conditions du milieu dans lequel la r\u00e9gulation sera effectu\u00e9e.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    Toutefois, une premi\u00e8re estimation de la quantit\u00e9 mini et maxi d’additif \u00e0 injecter peut \u00eatre calcul\u00e9e en amont de la d\u00e9finition du syst\u00e8me de dosage.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    La stabilit\u00e9 physico-chimique de l’eau<\/strong> permettra de d\u00e9finir le syst\u00e8me de dosage :<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    1. Eau stable : eau de forage, eau d\u00e9j\u00e0 trait\u00e9e (r\u00e9seaux d’adduction)<\/li>
    2. Eau de qualit\u00e9 variable : eau de rivi\u00e8re, lac…<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

      L’utilisation d’eau \u00e0 bas pH favorise l’efficacit\u00e9 des engrais et permet une r\u00e9duction de la concentration appliqu\u00e9e pour un m\u00eame effet.<\/p>\n","protected":false},"author":2,"featured_media":334,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":["post-316","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-traitement-de-leau","entry"],"yoast_head":"\nLa r\u00e9gulation du pH, ou point hydrog\u00e8ne en irrigation<\/title>\n<meta name=\"description\" content=\"La r\u00e9gulation du pH, ou point hydrog\u00e8ne, favorise l'efficacit\u00e9 des engrais et la r\u00e9duction de la concentration appliqu\u00e9e pour un m\u00eame effet.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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