C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/72 (2006.01) B01D 15/00 (2006.01) B09C 1/02 (2006.01) C02F 1/28 (2006.01) C02F 1/70 (2006.01) C02F 9/00 (2006.01)
Patent
CA 2108982
Water contaminated with halogenated organics, including chloroform, trichloroethane, solvents, pesticides, etc. is treated by passing the water through a permeable mixture of activated carbon and iron fillings. When the mixture is brought to a negative Eh voltae, the metal causes the contaminants to undergo chemical breakdown. The activated carbon acts to retard the contami- nant, giving it a long residence time close to the iron. The negative Eh conditions demand oxygen exclusion, such that a favoured application is to place the mixture in a trench below the water table in an aquifer, in the path of a plume of contaminant. The mix- ture may also be contained in a tank above, or in, the ground. An inert filler material, such as sand, may be included in the mix- ture.
Asquith Anthony
University Of Waterloo
LandOfFree
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