Removal of lead from drinking water

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 1/62 (2006.01) C02F 1/52 (2006.01) C02F 9/00 (2006.01) C02F 1/28 (2006.01) C02F 1/68 (2006.01)

Patent

CA 2216258

A process for removing lead from drinking water discharged from a drinking water outlet comprising: a) directing the water through a first matrix comprising a calcium mineral of between 10 and 100 weight percent of a solid calcium phosphate mineral which is slightly soluble in water, the remaining portion being a solid calcium carbonate mineral which is slightly soluble in water, such that there is sufficient contacting between the water and the first matrix to introduce sufficient phosphate ions into the water to form lead precipitate and reduce the lead concentration in the water to below 15 parts per billion; b) directing the lead depleted water from step (a) through a second matrix, the second matrix comprising a mineral that when in equilibrium with the water reduces the phosphate ion concentration to 60 mg/L or below.

Cette invention concerne un procédé permettant d'éliminer le plomb contenu dans l'eau potable provenant d'une arrivée d'eau potable, lequel procédé comprend les étapes suivantes: (a) faire passer l'eau à travers une première matrice se composant d'un minéral de calcium contenant entre 10 et 100 % en poids d'un minéral de phosphate de calcium solide et légèrement soluble dans l'eau, le reste étant un minéral de carbonate de calcium solide légèrement soluble dans l'eau, ceci de manière à obtenir un contact suffisant entre l'eau et la première matrice pour introduire une quantité suffisante d'ions de phosphate dans l'eau afin d'engendrer un précipité de plomb et de réduire la concentration de ce dernier dans l'eau à moins de 15 microgrammes par litre; (b) faire passer le plomb séparé de l'eau en (a) à travers une seconde matrice, laquelle se compose d'un minéral qui, lorsqu'il est en équilibre avec l'eau, permet de réduire la concentration d'ions de phosphate à 60 mg/l ou moins.

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