Treatment of Deinking Wastewater, 2008 Engineering, Pulping and Environmental Conference

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A filtrate obtained from wash deinking of flexographic newsprint were clarified with electro-coagulation and electroflotation mechanisms in an electrochemical cell. Ink concentration was calibrated with turbidity measurement. The clarification efficiency was determined with turbidity measurement and corroborated with cationic demand. The flexographic ink dispersions are pH responsive dispersions. Higher current densities and acidic conditions had higher clarification efficiency. The destabilization of inks dispersions was attributed to their interactions with metal ions and protonation at acidic pH. Under acidic environment, it was suggested that the carbon black ink particles are more hydrophobic and bubbles generated by the electrolysis of water easily collect these inks. COD and cationic demand is reduced with electroflotation treatment. Finally, hardness was used to measure the selected metal ions concentration.