| 摘要 |
Hydrolyzed wheat, corn, and potato starches are effective flocculants in destabilizing dilute as well as thick sludge suspensions. These starches are equal to, or better than, the synthetic polyacrylamide flocculants in destabilizing sludge suspensions, particularly when used in the treatment of bituminous tar sands tailings. The hydrolyzed wheat starch is especially effective when first contacted with metal salts such as salts containing calcium, aluminum and phosphate ions, and most particularly when first treated with a combination of such salt, formed in situ, and a lower aliphatic alcohol. Among the potato starch flocculants which were found to be generally better than the corn starch flocculants, those containing AlPO4 were the best. Potato starch flocculants are equally effective on oil-removed and no-oil-removed sludge suspensions. It also 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.
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