Destabilization of sludge with hydrolyzed starch flocculants

Details Destabilization of sludge with hydrolyzed starch flocculants Destabilization of sludge with hydrolyzed starch flocculants

C - Chemistry, Metallurgy

08

L

362/47, 134/54,

C08L 3/02 (2006.01) B01D 21/00 (2006.01) B01D 21/01 (2006.01) C02F 1/52 (2006.01) C13K 1/06 (2006.01)

Patent

CA 1121555

ABSTRACT OF THE DISCLOSURE Hydrolyzed wheat starch is an effective flocculant in destabilizing dilute as well as thick sludge suspensions. This wheat starch is equal to, or better than, the synthetic polyacrylamide flocculants in destabilizing sludge suspensions, particularly when used in the treatment of bituminous tar sands tailings and phosphate slimes. The hydrolyzed wheat starch is especially effective when first contacted with metal salts such as CaAlPO4, and most particularly when first treated with a combination of CaAlPO4, formed in situ, and a lower aliphatic alcohol. In a further embodiment of this invention it has been found that when cement is added together with the aforedescribed composition, there is achieved improved permeability and shear strength of the resulting sludge.

308619

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