# US 5,707,532 A · Methods of coagulating and decolorizing waste streams > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,707,532 A - Document ID: US5707532A - Status: Granted - Kind: A - Application number: 08/714,877 - Filed: 1996-09-17 - Granted: 1998-01-13 - Earliest claimed: 1994-10-31 - Assignees: Cytec Technology Corp. - Inventors: Gerald Guerro; Wendy L. DiNicola; Nicole Richards - Web page: https://patentgrep.com/patent/US5707532A ## CPC - C02F 1/56: Macromolecular compounds - C02F 1/54: using organic material - C02F 2103/28: from the paper or cellulose industry - Y10S 210/917: Color - Y10S 210/928: Paper mill waste, e.g. white water, black liquor treated - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract Compositions comprising polyamine and melamine polymers in certain ratios are provided for coagulating suspended solids in wastewaters such as deinking process waters and raw waters. ## Claims ### Claim 1 A method for reducing turbidity and color from a wastewater stream containing suspended solids and color bodies which comprises: (i) adding to said wastewater stream in an amount sufficient to coagulate said solids a composition comprising polyamine and melamine aldehyde acid colloid polymer in a ratio of about 90.0-99.9 parts by weight of polyamine to about 10.0-0.1 parts by weight of said acid colloid polymer; wherein said polyamine is a reaction product of a secondary amine and a difunctional epoxy compound or precursor thereof; and (ii) separating said solids from said wastewater stream. ### Claim 2 (depends on 1) A method according to claim 1 wherein the ratio of said polyamine to said acid colloid polymer ranges from about 96.5 to about 99.9 parts by weight polyamine to about 3.5-0.1 parts by weight acid colloid polymer. ### Claim 3 (depends on 1) A method according to claim 1 wherein the ratio of said polyamine to said acid colloid polymer ranges from about 98.0-99.1 parts by weight polyamine to about 2.0-0.1 parts by weight acid colloid polymer. ### Claim 4 (depends on 1) A method according to claim 1 wherein a wastestream is treated and the amount of said composition added to said wastestream ranges from about 0.5 to about 150 parts per million, based on the weight of said waste stream. ### Claim 5 (depends on 4) A method according to claim 4 wherein said wastewater stream is deinking process water produced from the processing of recycled paper. ### Claim 6 (depends on 1) A method according to claim 1 wherein said color bodies comprise flexographic ink. ### Claim 7 (depends on 6) A method according to claim 6 wherein said color bodies are removed from said wastewater stream. ### Claim 8 (depends on 1) A method according to claim 1 wherein said polyamine is a reaction product of dimethylamine and an epihalohydrin or precursor thereof. ### Claim 9 (depends on 1) A method according to claim 1 which further comprises adding an effective amount of a flocculant polymer prior to separating said solids from said wastewater stream. ### Claim 10 (depends on 9) A method according to claim 9 wherein said flocculant is an anionic polymer. ### Claim 11 (depends on 9) A method according to claim 9 wherein said anionic polymer is 1) hydrolyzed polyacrylamide or 2) a copolymer of acrylamide with a monomer selected from acrylic acid, acrylate, 2-acrylamido-2-methyl propanesulfonic acid and 2-acrylamido-2- methyl propane sulfonate. ### Claim 12 (depends on 10) A method according to claim 10 wherein said anionic polymer contains at least about 2 mole percent anionic functionality, based on the monomer. ### Claim 13 (depends on 1) A method according to claim 1 wherein said polyamine has a molecular weight ranging from about 50,000 to about 1 million. ### Claim 14 (depends on 1) A method according to claim 1 wherein said acid colloid polymer has a molecular weight ranging from about 50,000 to about 175,000. ### Claim 15 A method for separating suspended solids and color bodies from deinking process waters resulting from the processing of recycle paper which comprises: (i) adding to said process water from about 0.5 to about 150 parts per million, based on said process water of a composition comprising a polyamine and a melamine formaldehyde acid colloid polymer in a ratio of about 96.5-99.9 parts by weight of polyamine to about 3.5-0.1 parts by weight of acid colloid polymer; wherein said polyamine is a reaction product of a secondary amine and a difunctional epoxy compound or precursor thereof; and (ii) separating said solids and said color bodies from said process water.