An experimental investigation into the pre-treatment of synthetic membranes using sodium hydroxide solutions |
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Authors: | Sarah A JonesMichael R Bird Arto Pihlajamäki |
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Affiliation: | a Membrane Applications Laboratory, Department of Chemical Engineering, University of Bath, BA2 7AY, UK b Laboratory of Membrane Technology, LUT, P.O. Box 20, 53851 Lappeenranta, Finland |
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Abstract: | In this paper the effect of two pre-treatment methods are compared experimentally for the filtration of (i) a spent sulphite liquor (17.8 wt.% dry solids) using a 20 kg mol−1 molar mass cut off (MMCO) fluoropolymer membrane and (ii) a molasses solution (45° Brix) using a polysulphone (Psf) membrane (1.5 μm pore size). Both feeds are industrially relevant, and subject to severe fouling issues when membranes are used in their subsequent processing. The pre-treatment methods evaluated were: (i) conditioning with water at 60 °C only Protocol 1], and (ii) conditioning with water at 60 °C followed by cleaning with 0.5 wt.% NaOH Protocol 2]. Results are presented that confirm the benefits of sodium hydroxide preconditioning upon performance, supporting the suggestion by some membrane manufacturers that this step be included as part of the pre-treatment protocol. |
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Keywords: | Membrane pre-treatment Molasses Spent sulphite liquor Zeta potential |
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