초록 ▼

A method for clarifying food processing waste water containing suspended solids comprising (iii) adding to the waste water with an effective amount of at least one vinylamine polymer having a molecular weight of at least 10,000, wherein the polymer is prepared by first polymerizing N-vinylformami

A method for clarifying food processing waste water containing suspended solids comprising (iii) adding to the waste water with an effective amount of at least one vinylamine polymer having a molecular weight of at least 10,000, wherein the polymer is prepared by first polymerizing N-vinylformamide and, optionally, vinyl acetate to form a vinylformamide polymer or a vinylformamide/vinylacetate copolymer and then subjecting the vinyl formamide polymer or vinylformamide/vinylacetate copolymer to acid or base hydrolysis to form a vinylamine/vinylformaide copolymer, a vinylamine homopolymer or a up vinylamine/vinylalcohol copolymer; (ii) coagulating and flocculating the suspended solids; and (iii) separating the coagulated and flocculated suspended solids from the wastewater.

대표청구항 ▼

1. A method for clarifying grain processing waste water containing suspended solids comprising (i) adding to the waste water an effective amount of at least one vinylamine polymer having a molecular weight of at least 20,000, wherein the polymer is prepared by first polymerizing N-vinylformamide

1. A method for clarifying grain processing waste water containing suspended solids comprising (i) adding to the waste water an effective amount of at least one vinylamine polymer having a molecular weight of at least 20,000, wherein the polymer is prepared by first polymerizing N-vinylformamide and, optionally, vinyl acetate to form a vinylformamide polymer or a vinylformamide/vinylacetate copolymer and then subjecting the vinyl formamide polymer or vinylformamide/vinylacetate copolymer to acid or base hydrolysis to form a vinylamine/vinylformamide copolymer, a vinylamine homopolymer or a vinylamine/vinylalcohol copolymer; (ii) coagulating and flocculating the suspended solids; and (iii) separating the coagulated and flocculated suspended solids from the wastewater. 2. The method of claim 1 wherein the vinylamine polymer is vinylamine homopolymer. 3. The method of claim 1 wherein the vinylamine polymer is vinylamine/vinyl alcohol copolymer or vinylamine/vinylformamide copolymer containing from about 1 to about 99 mole percent vinylamine and from about 99 to about 1 mole percent vinyl alcohol or N-vinylformamide. 4. The method of claim 3 wherein the vinylamine polymer is vinylamine/vinylformamide copolymer containing from about 2 to about 50 mole percent vinylamine and from about 98 to about 50 mole percent vinylformamide. 5. The method of claim 3 wherein the vinylamine polymer is vinylamine/vinyl alcohol copolymer containing from about 2 to about 90 mole percent vinyl alcohol and from about 98 to about 10 mole percent vinylamine. 6. The method of claim 1 wherein the effective amount of the vinylamine polymer is from about 0.001 to about 1000 parts per million of the wastewater treated. 7. The method of claim 6 wherein the effective amount of the vinylamine polymer is from about 0.01 to about 500 parts per million. 8. The method of claim 6 wherein the effective amount of the vinylamine polymer is from about 1 to about 250 parts per million. 9. The method of claim 1, wherein the separating is carried out by dissolved air flotation. 10. The method of claim 1, wherein the separating is carried out by using a clarifier. 11. The method of claim 1 wherein the separating is carried out by mechanical dewatering using a belt press. 12. The method of claim 1 wherein the separating is carried out by mechanical dewatering using a plate and frame press. 13. The method of claim 1 further comprising adding to the grain processing waste water a polymeric flocculant selected from the group consisting of copolymers of acrylamide and esters, amides and nitriles of (meth) acrylic acid, dimethylaminoethylacrylate methyl chloride quaternary ammonium salt, dimethylaminoethylmethacrylate methyl chloride quaternary ammonium salt, sodium 2-acrylamido-2methylpropanesulfonic acid salt, diallyldimethyl ammonium chloride, vinyl pyrrolidone and vinylsulfonate and homopolymers selected from the group consisting of polyacrylamide, polyvinylpyrrolidone, polyvinylpyridine polyvinylpyridine, polyacrylic acid, polymeric 2-acrylamido-2-methylpropanesulfonic acid, polymeric dimethylaminoethylacrylate methyl chloride quaternary ammonium salt and polymeric dimethylaminoethylmcthacrylate methyl chloride quaternary ammonium salt.