Patent ID: 6059978
Filing Date: 2000-05-09
Classification: C02F,Y10S

Abstract:
A method of removing colorants from wastewater comprising the steps of:(a) adding a cationic polymer to the wastewater containing colorants in an amount sufficient to form a water soluble cationic polymer/colorant complex in the wastewater, wherein said cationic polymer is a polyamine selected from the group consisting of dicyandiamide/formaldehyde polymers, epichlorohydrin/amine polymers, and dicyandiamide/amine polymers,(b) adding an anionic sulfonated novolac polymer to the wastewater in an amount sufficient to allow the cationic polymer/colorant complex formed in step (a) to complex with the anionic polymer to form a flocculent precipitate in the wastewater, and(c) separating the flocculent precipitate from the wastewater.