| 摘要 |
<p>Methods of treating circulating water containing over-sprayed, water-borne and solvent-based paints, such as in a paint spray booth operation, comprise adjusting the alkalinity of the paint spray booth water to between about 100 and 600 ppm, on a calcium carbonate basis, by adding an alkalinity source thereto, adding a melamine polymer to the water, contacting the over-sprayed, water-borne and solvent-borne paints with the alkalinity-adjusted paint spray booth water before or after addition of the melamine polymer, adding an effective amount of a flocculant to the paint spray booth water, and removing resulting sludge from the paint spray booth water.</p> |
