Betz Laboratories, Inc.

Betzdearborn, Inc.

Ellen M Meyer

William S Carey

Keith A Bair

Jeffrey H Peltier

Elizabeth V Bissinger

Michael R Wood

Disclosed are methods for reducing turbidity of aqueous systems and clarifying wastewater systems utilizing a graft copolymer having the structure: ##STR1## whereby the cationic monomer (F) is represented by ##STR2## wherein R is hydrogen or a C.sub.1 to C.sub.3 alkyl group, R.sub.1 is the salt of an ammonium cation, and the molar percentage of a:b is from about 95:5 to about 5:95, with the proviso that the sum of a and b equals 100%.

Preparation of water soluble graft copolymers

A contaminant precipitating composition and method are disclosed. The composition comprises a water soluble, branched, polydithiocarbamic acid salt effective for the purpose of precipitating contaminants from an aqueous solution. The method comprises adding an amount of the composition effective for the purpose to the aqueous solution so as to complex, precipitate and remove contaminants from the aqueous solution.

Polymeric dithiocarbamate acid salt compositions and method of use

A contaminant precipitating composition and method are disclosed. The composition comprises a water soluble branched polymeric composition effective for the purpose of precipitating contaminants from an aqueous solution. The method comprises adding an amount of the composition, effective for the purpose, to the aqueous solution so as to complex, precipitate and remove contaminants from the aqueous solution.

Polymeric dithiocarbamic acid salt compositions and methods of use

Water treatment methods

Methods are disclosed for removing oil and metal ions from oily wastewaters. Polymeric tannin amine compounds are added to the oily wastewater to demulsify the oil, and flocculate the metal ions.

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Doylestown, PA, United States of America

Ellen M Meyer