# US 2013/0153512 A1 · Treatment of surfactant laden wastewater

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- Number: US 2013/0153512 A1
- Document ID: US20130153512A1
- Status: Published application
- Kind: A1
- Application number: 13/326,396
- Filed: 2011-12-15
- Published: 2013-06-20
- Earliest claimed: 2011-12-15
- Assignees: General Electric Company
- Inventors: Stephen Robert Vasconcellos; Matthew D. Mersch; James Quentin Pollett
- Web page: https://patentgrep.com/patent/US20130153512A1

## CPC

- C02F 1/56: Macromolecular compounds
- C08B 37/003: {Chitin, i.e. 2-acetamido-2-deoxy-(beta-1,4)-D-glucan or N-acetyl-beta-1,4-D-glucosamine; Chitosan, i.e. deacetylated product of chitin or (beta-1,4)-D-glucosamine; Derivatives thereof}
- C08L 5/08: Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives thereof
- C02F 1/5263: {using natural chemical compounds}
- C02F 2101/301: {Detergents, surfactants}
- C02F 2101/325: {Emulsions}
- C02F 2209/08: Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
- C08F 251/00: Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
- 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)
- C08B: POLYSACCHARIDES; DERIVATIVES THEREOF (polysaccharides containing less than six saccharide radicals attached to each other by glycosidic linkages C07H; fermentation or enzyme-using processes C12P19/00; sugar industry C13; production of cellulose D21)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

Clarification of surfactant laden wastewaters of the type commonly encountered in the laundry, dishwashing, textile manufacturing, and metal cleaning and degreasing processes is provided by use of a chitosan/(meth)acrylyloxy alkyl quaternary ammonium salt graft polymer.

## Claims

### Claim 1

A method of reducing the COD of an aqueous medium containing a COD level of >200 ppm based upon 1 million parts of said aqueous medium, said method comprising adding to said aqueous medium an effective amount of a chitosan/(meth)acrylyloxy alkyl quaternary ammonium salt graft polymer (C/MAOA Quat).

### Claim 2 (depends on 1)

A method as recited in claim 1 wherein said aqueous medium further comprises a surfactant level of greater than 50 ppm.

### Claim 3 (depends on 2)

A method as recited in claim 2 wherein said aqueous medium is wastewater chosen from laundry, dishwashing, textile manufacturing, and metal cleaning and degreasing processes.

### Claim 4 (depends on 3)

A method as recited in claim 3 wherein said C/MAOA Quat is added to said wastewater in an amount of about 4-10,000 ppm, and said C/MAOA is poly-METAS-Chitosan polymer having repeating units of:
wherein A has the formula of:
and wherein n is an integer from 50 to 5000.

### Claim 5 (depends on 4)

Method as recited in claim 4, wherein the poly(METAS)-Chitosan polymer has a viscosity in the range of from about 100 cps to about 3000 cps.

### Claim 6 (depends on 5)

A method as recited in claim 5 wherein said C/MAOA Quat is added to said wastewater in an amount of about 40-4,000 ppm.

### Claim 7 (depends on 4)

A method as recited in claim 4 wherein said wastewater is wastewater from a laundry, said wastewater comprising anionic surfactant therein.

### Claim 8 (depends on 4)

A method as recited in claim 4 wherein said wastewater is wastewater from a dishwashing process.

### Claim 9 (depends on 1)

A method as recited in claim 1 wherein said C/MAOA Quat is chloride free.