C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/54
C02F 11/12 (2006.01) C11B 13/00 (2006.01)
Patent
CA 1041233
ABSTRACT OF THE DISCLOSURE A method is disclosed for dehydrating a stabilised fatty sludge. The dehydration is obtained by adding an acid hydrolysing metal salt to an aqueous effluent containing fatty substances or degradation products thereof in an amount sufficient to complex the substances or products. A mineral acid may be added at the same line to reduce the pH factor to below 5, and the resulting complex is precipitated as a stabilised fatty sludge by raising the pH factor to 6 or more by the addition of alkaline earth-metal ions. The separated, stabilized fatty sludge is then acidified preferably to a pH factor below 2 so that it separates into an upper concentrated fatty sludge phase and a lower aqueous phase. This process is suitable for removing fatty substances or degradation products from aqueous effluents containing these materials.
206081
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