Concentration polarisation in reverse osmosis flow systems under laminar conditions. Effect of surface roughness and fouling

Reverse osmosis experiments were carried out under laminar flow conditions in a channel of cross-section 3 × 38 mm. Solution concentrations giving π f /Δ p up to 0·66 and cellulose acetate membranes having high rejections and distilled water fluxes of 12–15 × 10 −4 cm/sec were used. The product flux...

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Bibliographic Details
Published in:Chemical engineering science 1974-01, Vol.29 (7), p.1651-1658
Main Authors: Carter, J.W., Hoyland, G., Hasting, A.P.M.
Format: Article
Language:English
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Summary:Reverse osmosis experiments were carried out under laminar flow conditions in a channel of cross-section 3 × 38 mm. Solution concentrations giving π f /Δ p up to 0·66 and cellulose acetate membranes having high rejections and distilled water fluxes of 12–15 × 10 −4 cm/sec were used. The product fluxes and concentration polarisation for clean smooth membranes were closely predicted by a numerical solution of the theoretical equations. The effects of rough membrane surfaces in increasing polarisation and decreasing product flux were also closely predicted using a roughness depth determined from a profile of the surface irregularities. A rust layer on the membrane surface had similar effects on the flux and polarisation which could also be calculated.
ISSN:0009-2509
1873-4405
DOI:10.1016/0009-2509(74)87017-X