C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/74 (2006.01) C01G 49/00 (2006.01) C02F 1/66 (2006.01) C02F 1/72 (2006.01) C02F 9/00 (2006.01) C02F 11/00 (2006.01)
Patent
CA 2041039
ABSTRACT A method to detoxify municipal sewage sludge con- taining heavy metals comprises the steps of mixing sewage sludge, at least one catalytic oxidant such as a ferric salt, at least one regenerative oxidant and an acid to form a reacting slurry having a solids fraction and a liquid fraction and, after a suitable retention time, separating the solids fraction from the liquid fraction. The reacting slurry is maintained during its retention time at a pH range between approximately 1.0 to 2.0 and at an oxidation reduction potential of, at least, +400 millivolts. The heavy metals originally absorbed into the solids fraction of the sewage sludge solubilize into the liquid fraction of the reacting slurry. Thereafter, the reacting slurry is discharged into a conventional solids/liquid separating device so that the metal-laden liquid fraction becomes separated from the solids fraction which is now substantially bar ren of heavy metals. The solids fraction is neutral- ized to a pH prescribed by EPA regulations so that it can be safely applied to agricultural land as a detoxified fertilizer and soil conditioner.
Rasmussen Hans W.
Rockandel Michael A.
Gowling Lafleur Henderson Llp
Green Environmental Systems Ltd.
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