Cleaning halogenated contaminants from groundwater

Details Cleaning halogenated contaminants from groundwater Cleaning halogenated contaminants from groundwater

C - Chemistry, Metallurgy

02

F

C02F 1/70 (2006.01) B09C 1/00 (2006.01) E02D 31/00 (2006.01)

Patent

CA 2069621

Groundwater is contained under highly reducing conditions. The Eh value is brought down to -100 or -200mV, at which the contaminant breaks down, probably by a hydrolysis reaction. The plume of contaminated groundwater (2) is fed through a trench (6) containing a metal such as iron filings (7), which is effective, under strict exclusion of oxygen, and over a period of time, to lower the Eh. Alternatively, the water may be pumped through an enclosed tank containing iron, or other metal, fillings or other high-surface-area form.

Suivant le procédé de cette invention, on enferme la nappe d'eau dans des conditions de réduction trés importantes. La valeur Eh s'abaisse à -100 ou -200 mV, valeur à laquelle l'agent contaminant se dissocie, probablement par réaction hydrolytique. La colonne d'eau contaminée (2) passe par une tranchée (6) contenant un métal comme par exemple de la limaille de fer (7) qui permet, en l'absence totale d'oxygène, et sur une certaine durée, de faire efficacement baisser le Eh. Il est également possible de pomper l'eau dans un réservoir enterré renfermant du fer, ou un autre métal, de la limaille ou comportant une autre forme de zone à grande surface de contact.

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