Authors: Patricia Meyer Martin Hartinger Sebastian Sigler Ulrich Kulozik
Publish Date: 2016/12/21
Volume: 10, Issue: 4, Pages: 674-686
Abstract
The aim of the present study was the evaluation of a membrane cascade comprised of ultrafiltration UF in series with reverse osmosis RO or nanofiltration NF in comparison to a singlestage process It was found that the upstream UF accelerated the NF and the RO whereby the effect was more distinct for the NF The maximum volume reduction ratio VRR during skim milk and sweet whey concentration could be increased by 78 and 96 respectively by substituting a single NF by an UFNF cascade The replacement of a single RO by a UFRO cascade during concentration of skim milk slightly increased the VRR by 3 However the energy demand could be reduced by approximately 16 For the concentration of sweet whey it was found that it is more advantageous to conduct the RO at a higher transmembrane pressure TMP instead of applying an UFRO cascadeWe gratefully thank Sabine Husby Milena Wekel Michael Reitmaier and Christian Gottwald for help with data evaluation useful discussion and experimental support This research project was supported by the German Ministry of Economics and Technology via AiF and the FEI Forschungskreis der Ernährungsindustrie eV Bonn Project AiF 16836 N
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