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Mass transfer of differently sized organic solutes at spacer covered and permeable nanofiltration wall (CROSBI ID 201010)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Dražević, Emil ; Košutić, Krešimir ; Dananić, Vladimir Mass transfer of differently sized organic solutes at spacer covered and permeable nanofiltration wall // Chemical engineering journal, 244 (2014), 152-159. doi: 10.1016/j.cej.2014.01.043

Podaci o odgovornosti

Dražević, Emil ; Košutić, Krešimir ; Dananić, Vladimir

engleski

Mass transfer of differently sized organic solutes at spacer covered and permeable nanofiltration wall

Concentration polarization (CP) phenomena may significantly affect water permeability and removal of organics solutes in cross- flow nanofiltration (NF) making it an important optimization parameter. Most of the models predict CP using mass transfer coefficients that may be estimated using model Sherwood (Sh) relations of a general form, Sh = a*Reb Scc. In many cases Sh relations are able to predict mass transfer coefficients remarkably well ; however, such relations are in general valid only for non – permeable walls. Sh relations are usually experimentally validated using a binary solution of single solute and water where Schmidt numbers (Sc) are varied by changing the temperature or density of the solution, at a constant or varied Reynolds number (Re). A different approach is used herein and each of ten organic solutes, of different diffusivity at constant concentration and viscosity of solutions, represented one Sc covering a range from 850 – 2022. This study evaluated the Sh relation in predicting the mass transfer of differently sized organic solutes in rectangular channel at spacer covered and permeable NF wall of defined porosity. Comparison of experimental Sh, obtained using the velocity variation method, and model Sh showed that model Sh relation correctly predicts mass transfer of organics when particular solute flux through the NF permeable wall is sufficiently low. A correction correlation is proposed for coefficient c on Sc in model Sh relation, where c approaches the model Sh value, 0.42, with the increase in size of the solutes. In addition, data presented show that the removal of organic solutes from the water may be significantly improved, up to 280%, by changing the hydrodynamics in the channel.

nanofiltration; porosity; concentration polarization; pore size distribution; mass transfer coefficient

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Podaci o izdanju

244

2014.

152-159

objavljeno

1385-8947

10.1016/j.cej.2014.01.043

Povezanost rada

Kemijsko inženjerstvo, Interdisciplinarne tehničke znanosti

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