Flexographic newspaper deinking : treatment of wash filtrate effluent by membrane technology

B. Chabot; G.A. Krishnagopalan; S. Abubakr

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Flexographic newspaper deinking : treatment of wash filtrate effluent by membrane technology

Informally Refereed

Authors:

B. Chabot, G.A. Krishnagopalan, S. Abubakr

Year:

1999

Type:

Miscellaneous Publication

Station:

Forest Products Laboratory

Source:

Journal of pulp and paper science. Vol. 25, no. 10 (Oct. 1999): Pages 337-343

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Abstract

Ultrafiltration was investigated as a means to remove flexographic ink pigments from wash filtrate effluent generated from various mixtures of flexographic and offset old newspapers from deinking operations. Membrane separation efficiency was assessed from permeate flux, fouling rate, and ease of membrane regeneration (cleaning). Ultrafiltration was capable of completely removing ink pigments from effluent streams. Permeate flux decreased significantly with time due to membrane fouling and concentration polarization. Flocculation by acidification of the flexographic ink of effluents containing high flexo ink content improved significantly the permeation rate and reduced the fouling due possibly to a more permeable cake formation near the membrane surface. Ultrafiltration produced better water quality compared to standard jar tests.

Keywords

Flexographic newspaper deinking, newspapers, deinking, ultrafiltration, wash filtrate effluent, membrane technology

Citation

Chabot, B.; Krishnagopalan, G.A.; Abubakr, S. 1999. Flexographic newspaper deinking : treatment of wash filtrate effluent by membrane technology. Journal of pulp and paper science. Vol. 25, no. 10 (Oct. 1999): Pages 337-343