Method for the treatment of water treatment sludge

Details Method for the treatment of water treatment sludge Method for the treatment of water treatment sludge

C - Chemistry, Metallurgy

02

F

C02F 11/00 (2006.01) C02F 1/52 (2006.01) C02F 11/14 (2006.01)

Patent

CA 2165168

A method for the treatment of sludge obtained from such a water treatment process wherein an aluminium or iron chemical is used as a coagulant, so as to reduce the amount of sludge, which method comprises the steps of: a) treating the water treatment sludge with an inorganic acid to produce an acidic sludge comprising dissolved aluminium or iron; b) optionally separating insoluble material from the acidic sludge to produce an acidic solution comprising dissolved aluminium or iron; e) treating said acidic sludge or said acidic solution with a +1-cation compound in the presence of sulphate ions in such conditions that the pH of the sludge or solution remains at a level where aluminium precipitates as an alunite compound or iron precipitates as a jarosite compound; and d) separating the precipitated alunite or jarosite compound from the remaining sludge.

Méthode de traitement des boues issues d'un procédé de traitement des eaux dans lequel un produit chimique contenant de l'aluminium ou du fer sert de coagulant pour réduire le volume des boues. Cette méthode comporte plusieurs étapes: a) le traitement des boues au moyen d'un acide inorganique; les boues acides ainsi obtenues contiennent de l'aluminium ou du fer dissous, b) la séparation éventuelle des matières insolubles et des boues acides, pour obtenir une solution acide contenant de l'aluminium ou du fer dissous, c) le traitement de ces boues ou de cette solution acides au moyen d'un composé cationique +1- en présence d'ions de sulphate, dans des conditions telles que le pH des boues ou de la solution reste à un niveau où l'aluminium précipite en composé d'alunite et où le fer précipite en composé de jarosite, et d) la séparation des composés d'alunite ou de jarosite précipités et des boues résiduelles.

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