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Membranes 2013, 3(4), 285-297; doi:10.3390/membranes3040285
Article

Performance Modeling and Cost Analysis of a Pilot-Scale Reverse Osmosis Process for the Final Purification of Olive Mill Wastewater

1,* , 2
,
1
 and
1
1 Department of Chemical Engineering, University of Granada, 18071 Granada, Spain 2 Department of Molecular Biology and Biochemical Engineering, University of Pablo de Olavide, 41013 Seville, Spain
* Author to whom correspondence should be addressed.
Received: 6 August 2013 / Revised: 8 September 2013 / Accepted: 29 September 2013 / Published: 11 October 2013
(This article belongs to the Special Issue Membranes in Process Intensification)
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Abstract

A secondary treatment for olive mill wastewater coming from factories working with the two-phase olive oil production process (OMW-2) has been set-up on an industrial scale in an olive oil mill in the premises of Jaén (Spain). The secondary treatment comprises Fenton-like oxidation followed by flocculation-sedimentation and filtration through olive stones. In this work, performance modelization and preliminary cost analysis of a final reverse osmosis (RO) process was examined on pilot scale for ulterior purification of OMW-2 with the goal of closing the loop of the industrial production process. Reduction of concentration polarization on the RO membrane equal to 26.3% was provided upon increment of the turbulence over the membrane to values of Reynolds number equal to 2.6 × 104. Medium operating pressure (25 bar) should be chosen to achieve significant steady state permeate flux (21.1 L h−1 m−2) and minimize membrane fouling, ensuring less than 14.7% flux drop and up to 90% feed recovery. Under these conditions, irreversible fouling below 0.08 L h−2 m−2 bar−1 helped increase the longevity of the membrane and reduce the costs of the treatment. For 10 m3 day−1 OMW-2 on average, 47.4 m2 required membrane area and 0.87 € m−3 total costs for the RO process were estimated.
Keywords: olive mill wastewater; advanced oxidation processes; membrane processes; reverse osmosis; wastewater reclamation; modelization olive mill wastewater; advanced oxidation processes; membrane processes; reverse osmosis; wastewater reclamation; modelization
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Ochando-Pulido, J.M.; Hodaifa, G.; Victor-Ortega, M.D.; Martinez-Ferez, A. Performance Modeling and Cost Analysis of a Pilot-Scale Reverse Osmosis Process for the Final Purification of Olive Mill Wastewater. Membranes 2013, 3, 285-297.

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