Publication

Polymeric flocculant for removal of solids from aqueous suspensions or sludges such as sewage sludge

Jutta Christine Wandrey
1991
Patents

Abstract

The solids are removed from an aq. suspension contg. 0.01-200 g solids/L using a suspension of a water-sol., high-mol. wt., highly crosslinked copolymer of di-Me diallyl ammonium chloride and 0.1-3 mol.% of a crosslinked comonomer, mixed with acryloguanamine copolymers. The crosslinking polymers are ammonium salts with >=2 allyl groups, e.g., Me triallyl ammonium chloride and tetrallyl ammonium chloride. The suspension is used at a rate of 0.005-2%, based on solids content, at 276-333 K and pH 3-9 to form a floc which can be sepd. by known means. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/a15dc495-b7d2-45f1-9a8b-3c15991051f9

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Jutta Christine Wandrey
1991
Patents

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/a15dc495-b7d2-45f1-9a8b-3c15991051f9

About this result

Related concepts (32)

Sewage sludge

Sewage sludge is the residual, semi-solid material that is produced as a by-product during sewage treatment of industrial or municipal wastewater. The term "septage" also refers to sludge from simple wastewater treatment but is connected to simple on-site sanitation systems, such as septic tanks. When fresh sewage or wastewater enters a primary settling tank, approximately 50% of the suspended solid matter will settle out in an hour and a half.

Flocculation

In colloidal chemistry, flocculation is a process by which colloidal particles come out of suspension to sediment in the form of floc or flake, either spontaneously or due to the addition of a clarifying agent. The action differs from precipitation in that, prior to flocculation, colloids are merely suspended, under the form of a stable dispersion (where the internal phase (solid) is dispersed throughout the external phase (fluid) through mechanical agitation) and are not truly dissolved in solution.

Polymer

A polymer (ˈpɒlᵻmər; Greek poly-, "many" + -mer, "part") is a substance or material consisting of very large molecules called macromolecules, composed of many repeating subunits. Due to their broad spectrum of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. Polymers range from familiar synthetic plastics such as polystyrene to natural biopolymers such as DNA and proteins that are fundamental to biological structure and function.

Related publications (6)

Polymeric flocculant for removal of solids from aqueous suspensions or sludges such as sewage sludge

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