C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/72 (2006.01) C02F 3/34 (2006.01) C02F 9/00 (2006.01) C02F 11/00 (2006.01) C02F 1/52 (2006.01) C02F 1/66 (2006.01)
Patent
CA 2379928
The invention relates to a hybrid biological and chemical method for decontaminating sludge containing heavy metals and pathogenic microorganisms, consisting of the following steps: the sludge is mixed with an acidic leaching solution in order to acidify the sludge with a pH which is low enough to solubilize the majority of the heavy metals and to destroy most of the pathogenic microorganisms but which is also high enough to minimize the solubilization of fertilizing elements; oxidation-reduction of more than +400 mv is maintained, liquid-solid separation occurs in order to obtain a solid fraction comprising decontaminated acidic sludge and a liquid fraction comprising heavy metals which are dissolved in a leaching solution; the sludge is neutralized: and neturalized decontaminated sludge is recovered, whereby the fertilizing elements contained therein, i.e. carbon, nitrogen and phosphorus, remain substantially unchanged in relation to the initially contaminated sludge.
La présente invention concerne un procédé hybride chimique et biologique de décontamination des boues d'épuration contenant des métaux lourds et des micro-organismes pathogènes, comprenant les étapes suivantes: mélange des boues avec une solution lixiviante acide pour acidifier les boues à un pH suffisamment bas pour solubiliser la majorité des métaux lourds et détruire la majorité des micro-organismes pathogènes, mais suffisammment haut pour minimiser la solubilisation des éléments fertilisants; maintien d'un potentiel d' oxydoréduction supérieur à+400 mV; séparation liquide-solide pour donner une fraction solide comprenant des boues acides décontaminées, et une fraction liquide comprenant les métaux lourds dissous dans la solution lixiviante; neutrali-sation des boues; et récupération des boues décontaminées neutralisées dont le contenu en éléments fertilisants, tels que le carbone, l'azote et le phosphore, est demeuré substantiellement inchangé par rapport aux boues initialement contaminées.
Blais Jean-Francois
Hammy Fatima
Mercier Guy
Meunier Nathalie
Sasseville Jean-Louis
Goudreau Gage Dubuc
Institut National de La Recherche Scientifique
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