The objective of this study was to evaluate the use of membrane technology to treat oxygen and peroxide-reinforced extraction stage (EPO) filtrate from a kraft pulp mill bleach plant. Three different types of tubular membranes were tested in a pilot plant: (i) tight ultrafiltration (UF); (ii) open UF followed by nanofiltration (UF + NF); and (iii) nanofiltration (NF). According to the separation performance, considering the chemical oxygen demand (COD) and colour removal, permeate flux, operational simplicity and cost, the results indicated that the best option for treatment of (EPO) filtrates was the tight UF membrane. This membrane obtained a COD removal of 79% with a colour reduction of 86%. The effect of (EPO) filtrate UF treatment on the mill effluent treatment plant was evaluated. Compared with the actual mill effluent, the results indicated that if the UF permeate was recycled in the bleaching area, the COD reduction efficiency increased by 7%, the final effluent colour decreased by 8%, the biological sludge production decreased by 18%, and the energy consumption decreased by 40%. In the tertiary treatment plant, the coagulant dosage decreased by 40%, and the tertiary sludge production decreased by 46%.
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Research Article|
July 02 2014
Membrane treatment of the bleaching plant (EPO) filtrate of a kraft pulp mill Available to Purchase
Rafael Quezada;
1Universidade Federal de Viçosa, Av. P. H. Rolfs, s/no, Campus Universitário, Viçosa 36570-000, MG, Brazil
E-mail: [email protected]
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Claudio Mudado Silva;
Claudio Mudado Silva
1Universidade Federal de Viçosa, Av. P. H. Rolfs, s/no, Campus Universitário, Viçosa 36570-000, MG, Brazil
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Ana Augusta Passos Rezende;
Ana Augusta Passos Rezende
1Universidade Federal de Viçosa, Av. P. H. Rolfs, s/no, Campus Universitário, Viçosa 36570-000, MG, Brazil
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Leif Nilsson;
Leif Nilsson
2Membrane Specialists South America, Rua Antônio Gabriel do Amaral 82, Jardim Brasil, Atibaia 12940-214, SP, Brazil
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Mauro Manfredi
Mauro Manfredi
1Universidade Federal de Viçosa, Av. P. H. Rolfs, s/no, Campus Universitário, Viçosa 36570-000, MG, Brazil
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Water Sci Technol (2014) 70 (5): 843–850.
Article history
Received:
April 08 2014
Accepted:
June 23 2014
Citation
Rafael Quezada, Claudio Mudado Silva, Ana Augusta Passos Rezende, Leif Nilsson, Mauro Manfredi; Membrane treatment of the bleaching plant (EPO) filtrate of a kraft pulp mill. Water Sci Technol 1 September 2014; 70 (5): 843–850. doi: https://doi.org/10.2166/wst.2014.304
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