Water and Wastewater.com Help Forum - High Gloss Emulsion waste varnish
I hope you are aware that the solvent 2-(2-Butoxy)Ethanol is a very hazardous chemical (causing blood cancer and other nasty things).
MSDS
Therefore, the workers should be protected against uptake over the skin and air tract. Ideally the varnish should be replaced by another less harmful product.
I would guess cationic flocculants or clay will be effective in removing the varnish residues and the anionic surfactant Sodium Dioctyl Sulphosuccinate. The solvents might be treatable biologically. You should check the solvents content in the wastewater by gas chromatography.
Kind regards
T. Sobisch
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