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US 9,790,111 B2Granted
Method for thickening or dehydrating sludge
AssigneeRoquette Freres
InventorsLaura Crowther-Alwyn, Medhi Carre, Michel Simon
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AssigneeRoquette Freres
InventorsLaura Crowther-Alwyn, Medhi Carre, Michel Simon
Estimating the term…
Disclosed is a method for thickening or dehydrating sludge, which includes at least: a) a step of adding flocculants to the sludge to be treated; b) a step of flocculation by agitation of the sludge with the flocculants thus added in order to form a mixture of flocks and an aqueous solution; c) a step of mechanical separation of the flocks and the aqueous solution formed during the preceding step; d) a step of recovering the aqueous solution and the flocks that make up a treated sludge; wherein: the added flocculants are made up of at least one cationic starch (S) and at least one cationic polyacrylamide (P); the cationic starch or starches (S) including a fixed weight percentage of nitrogen of at least 2%; and the weight ratio (R) ws/(ws+wp), expressed as solids, is included between 0.6 and 0.99.
A process for thickening or dehydrating sludge, comprising at least:
A composition comprising at least one cationic starch (S) and at least one cationic polyacrylamide (P), in which composition the cationic starch(es) (S) comprise a fixed nitrogen weight percent of at least 2.5% and the weight ratio (R) wS/(wS+wP) of which, expressed as dry weight, is between 0.6 and 0.95.
Dependencies are inferred from the claim text.