Fouling Analysis and Performance of Tubular Ultrafiltration on Pretreated Olive Mill Waste Water |
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Authors: | Evangelia V Tsagaraki Harris N Lazarides |
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Affiliation: | (1) Department of Food Science and Technology, Aristotle University of Thessaloniki, Box 235, 541 24 Thessaloniki, Greece; |
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Abstract: | This study deals with the performance of a tubular ultrafiltration system on sieved and centrifuged olive mill waste water.
A generalized statistical model was developed describing the impact and the relative importance of major experimental parameters
(membrane pore size, transmembrane pressure, feed flow rate, and feed temperature) on permeate flux. According to this model,
process pressure appeared to have the largest impact on permeate flux, followed by process temperature. As membrane treatment
of such a difficult material largely depends on fouling, a systematic analysis of prevailing fouling mechanisms was also run.
Despite sieving and centrifugation of the original waste, membrane fouling caused a flux decline of 60–65% within 15–20 min.
Internal fouling, pore blocking, and cake layer formation were all responsible for membrane fouling during the first 40 min
of operation. After that period, cake formation appeared to play a predominant role. Based on the proposed generalized model,
the relative importance of process parameters can be evaluated and process performance can be improved by proper interventions.
Independent of membrane size, fouling is a serious problem to be resolved. The qualitative performance of this process, including
chemical oxygen demand distribution, polyphenol profile, and antioxidant capacity, is discussed in a separate paper. |
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