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Ochando-Pulido J.M.,University of Granada | Verardo V.,University of Almeria | Segura-Carretero A.,Research and Development Center for Functional Food | Segura-Carretero A.,University of Granada | Martinez-Ferez A.,University of Granada
Desalination | Year: 2015

The membrane plant dimension and fouling control strategy of an integrated batch UF and NF membranes-in-series process is addressed for the simultaneous treatment of the two main effluents generated in olive mills operating with the two-phase technology, in particular wastewater derived from the washing of the olives (OWW) and from the olive oil washing during the vertical centrifugation (OOW). Beforehand, the raw effluent, that is, 1:1v/v mixture of OWW and OOW, called OWMW2, was pretreated by pH-temperature flocculation stand-alone or followed by photocatalysis with TiO2 nanoparticles under UV irradiation. The proposed model is able to predict the permeate flux performance of the selected membranes at a given time as a function of the applied pressure and organic matter load of the feedstock accurately. Moreover, working upon threshold conditions provides significant and stable fluxes, 15.5Lh-1m-2 on the UF membrane and 22.2Lh-1m-2 on the NF one, minor fouling build up (28.6-33.3% reduction) as well as required membrane area, 170.3 and 61m2, respectively. Finally, the treatment line just comprising UF preceded by pH-T flocculation and UV/TiO2 photocatalysis provides an effluent compatible for irrigation and permits the minimum membrane plant dimension (only 6 total modules). © 2014 Elsevier B.V.


Ochando-Pulido J.M.,University of Granada | Verardo V.,University of Almeria | Segura-Carretero A.,Research and Development Center for Functional Food | Segura-Carretero A.,University of Granada | Martinez-Ferez A.,University of Granada
Journal of Industrial and Engineering Chemistry | Year: 2015

In this work, the resistances-in-series plus critical flux models are used as a simple but efficient tool in order to describe and predict the dynamic performance of a reverse osmosis membrane process, aimed for the tertiary treatment of two-phase olive mill wastewater (OMW2ST). To overcome the uncertainty of fouling, engineers overdesign the membrane plants by using wide safety margins that trigger the costs sensibly. One approach to answer the investor's need to trust membrane technology is to guarantee that fouling will be strongly inhibited or avoided. Within this context, concentration polarization and fouling could be accurately addressed by the applied models. Similar concentration polarization and fouling build-up rate on the selected membrane was found in the operating pressure range 15-25bar (1.20×10-1-1.41×10-1h-1), but increased over 5 times (6.42×10-1h-1) upon incrementing the transmembrane pressure up to 35bar. Moreover, concentration polarization decreased 22.6% and the fouling build-up rate became reduced 45.5% with an increase of the crossflow up to 5.09ms-1 upon negligible energy penalty, also avoiding irreversible fouling. Finally, significantly minor fouling (52.5-56.2% reduction) was attained at the lowest temperature, regularly experienced during the olive oil production campaign. © 2015 The Korean Society of Industrial and Engineering Chemistry.

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