Les élèves ont visité l’usine de traitement de l’eau à Pléven. Une usine impressionnante qui fournit toutes les communes des alentours : De Bel Air jusqu’à St Malo , en eau potable !
Nous avons appris que avant d’être consommable l’eau doit passer par différentes étapes afin d’enlever les grosses impuretés (feuilles, branches…) mais aussi pour enlever les nitrates, les bactéries….
Nous avons d’abord visionné un film qui explique le fonctionnement de l’usine. De cette salle, nous avions un magnifique point de vue sur le barrage.
puis nous avons commencé la visite avec le dégrillage, la salle de flottaison ( introduction de produits coagulants qui retiennent les particules en suspension).
Puis la salle de supervision de l’usine. De cet endroit, on peut contrôler le fonctionnement de l’usine, la sécurité de l’usine mais également le réseau de distribution de l’eau.
Nous avons ensuite rejoint la salle où se trouvent les pompes qui envoient l’eau vers les réservoirs ou les châteaux d’eau, l’étape qui précède celle ou nous ouvrons le robinet.
A la suite de cette visite, nous avons refait le point sur le cycle naturel de l’eau et son cycle domestique (le petit cycle).
Nous commençons à prendre conscience que si tout le monde se responsabilisait en consommant davantage “au naturel” tous ces traitements ne seraient pas utiles. L’usine n’aurait qu’à récupérer l’eau, la filtrer puis l’envoyer vers nos maisons…
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