Method of removing colour from waste water using an aqueous dispersion polymer.

摘要

The present invention relates to color removal agents comprising water soluble cationic polymer dispersions and to their use for the removal of color present in waste water effluents, especially from effluents discharged by the pulp and paper industries. In particular it relates to a method for removing color from a paper mill waste effluent which comprises the step of adding a low molecular weight hydrophobic polymer dispersion to the effluent. The hydrophobic dispersion is preferably formed from the precipitation polymerization of at least one hydrophilic monomer and a hydrophobic monomer in the presence of a precipitation aid, water, a chain transfer agent, and an initiator.