Environmental Science and Pollution Research

, Volume 25, Issue 35, pp 34976–34984 | Cite as

Matrix effect in case of purification of oily waters by membrane separation combined with pre-ozonation

  • Gábor VerébEmail author
  • Ildikó Kovács
  • Mihály Zakar
  • Szabolcs Kertész
  • Cecilia Hodúr
  • Zsuzsanna László
Advanced oxidation processes for water/wastewater treatment


In the present study, oil in water emulsions (coil = 100 ppm; doil droplets < 2 μm) was purified with ozonation followed by microfiltration using polyethersulfone (PES) membrane (dpore = 0.2 μm). The effects of pre-ozonation on membrane microfiltration were investigated in detail both in case of ultrapure and model groundwater matrices, applying different durations (0, 5, 10, and 20 min) of pre-ozonation. Simultaneously, the effects of added inorganic water components on the combined method were investigated. Size distribution of oil droplets, zeta potentials, fluxes, and purification efficiencies were measured and fouling mechanisms were described in all cases. It was found that the matrix significantly affected the size distribution and adherence ability of oil droplets onto the membrane surface, therefore fouling mechanisms also were strongly dependent on the matrix. In case of low salt concentration, the total resistance was caused mainly by reversible resistance, which could be significantly reduced (eliminated) by pre-ozonation. In case of model groundwater matrix, nearly twice higher total resistance was measured, and irreversible resistance was dominant, because of the higher adhesion ability of the oil droplets onto the membrane surface. In this case, pre-ozonation resulted in much lower irreversible, but higher reversible resistance. Increased duration of pre-ozonation raised the total resistance and reduced the elimination efficiency (due to fragmented oil droplets and water soluble oxidation by-products) in both cases, therefore short pre-ozonation can be recommended both from economic and performance aspects.


Ozonation Microfiltration Crude oil Matrix Emulsion Fouling 



This project was supported by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences.

Funding information

The authors are grateful for the financial support provided by the project Hungarian Science and Research Foundation (NKFI contract number K112096).


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Process Engineering, Faculty of EngineeringUniversity of SzegedSzegedHungary

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