초록 ▼

A process for dye removal from effluent is disclosed which includes treating the effluent with a reducing agent, adjusting the pH to a selected value in the range of 2-7, treating the effluent with a particular charge neutralization mixture, adjusting the pH a second time and subjecting the mixture

A process for dye removal from effluent is disclosed which includes treating the effluent with a reducing agent, adjusting the pH to a selected value in the range of 2-7, treating the effluent with a particular charge neutralization mixture, adjusting the pH a second time and subjecting the mixture to a flocculating process with selected chemicals.

대표청구항 ▼

A process for treating liquid effluent containing dye comprising steps (a)-(e): (a) treating the effluent with a reducing agent at a concentration of 50-100 parts per million of reducing agent per 1000 ADMI units of color; (b) reducing the pH of the liquid effluent to a value in the range of 2.0-7.0

A process for treating liquid effluent containing dye comprising steps (a)-(e): (a) treating the effluent with a reducing agent at a concentration of 50-100 parts per million of reducing agent per 1000 ADMI units of color; (b) reducing the pH of the liquid effluent to a value in the range of 2.0-7.0; (c) treating the liquid effluent with a charge neutralization mixture wherein said neutralization mixture comprises in a ratio of 30-70 to 70-30 parts by weight of i:ii: (i) at least one aluminum salt selected from the group consisting of aluminum hydroxychloride, aluminum polyhydroxychloride, alum, aluminum chloride and sodium aluminate; and (ii) a cationic polymer selected from the group consisting of: (A) at least one water soluble cationic polymer selected from the group consisting of (A) a copolymer of acrylamide with a cationic monomer selected from the group consisting of: methacryloylethyltrimethylammonium[X-]and acryloylethyltrimethylammonium[X-], wherein X-is selected from the group consisting of chloride, bromide, iodide, SO4-2 and CH3SO4-2; (B) a compound of Formula I: [Figure] Formula I wherein: R1 and R2 may be the same or different and are each independently selected from the group consisting of hydrogen and C1-C8 straight or branched alkyl; and substituted C1-C8 straight or branched alkyl; X-is selected from the group consisting of chloride, bromide, iodide, SO4-2 and CH3SO4-2; m is a number from 200 to 50,000; and (C) a compound of Formula II: [Figure] Formula II wherein R3 and R4 may be the same or different and are each independently selected from the group consisting of C1-C8 straight or branched alkyl, m is a number from 200 to 50,000 and X-has the same value as defined in Formula I, until the Zeta potential reaches±15 millivolts; (d) adjusting the pH of a mixture thus formed to be greater than or equal to 5.0; and (e) subjecting the mixture to a flocculating process by adding 1-5 parts per million of at least one compound selected from the group consisting of: (i) anionic polymers selected from the group consisting of acrylic acid/acrylamide copolymers in excess of 2 million molecular weight; and (ii) nonionic polymers selected from the group consisting of polyacrylamides greater than 2 million molecular weight.