Treatment of suspensions

Details Treatment of suspensions Treatment of suspensions

2007-08-07

2007-08-07

Hruskoci, Peter A. (Department: 1724)

Compositions

Water-softening or purifying or scale-inhibiting agents

Plant or organic material containing

C210S728000, C516S129000, C524S922000

Reexamination Certificate

active

10472788

ABSTRACT:
A method of dewatering a suspension of solids in an aqueous medium, comprising introducing into the suspension a flocculating system, which flocculation system comprises, a) a substantially non-ionic water-soluble polymer and b) a cationic polymeric flocculant of intrinsic viscosity at least 4 dl/g, thereby causing the solids to flocculate, separating the flocculated from aqueous medium, characterized in that i) the components a) and b) are introduced into the suspension as an aqueous blend; or ii) component a) is a non-ionic polymer that has an average molecular weight of below 750,000 and components a) and b) are introduced into the suspension as an aqueous blend or separately. Also claimed is an aqueous composition comprising the substantially non-ionic water-soluble polymer and cationic polymer, method for making it and a composition comprising a blend of substantially anhydrous particles of component (a) and component (b). The method and novel composition are particularly suitable for dewatering aqueous suspensions such as sewage sludges.

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Chem. Abstr. 1987:560906 for JP 62-53800 (1987).
Lee C.H. and J.C. Liu (2000) “Enhanced sludge dewatering by dual polyelectrolytes conditioning”Water Residues 34pp. 4430-4436.

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