Particle size distribution analysis of chemically enhanced two-phase membrane filtration for olive mill effluents

Sooddeh Salimi Khaligh, Nevin Yagci*, Cigdem Balcik, Bahar Ozbey, Bulent Keskinler, Tugba Olmez-Hanci, Nadir Dizge, Derin Orhon, Seval Sozen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


BACKGROUND: This study used particle size distribution (PSD) to reveal how chemical conditioning inflicted changes on different chemical oxygen demand (COD) size fractions to improve the potential of two-phase membrane separation as an effective preliminary step for the sustainable management of olive processing wastewaters. RESULTS: Experiments were designed to explore: (i) the potential of membrane separation as a pretreatment step; and (ii) the way in which chemical conditioning improved the removal potential of membrane treatment. Particle size distribution analysis was conducted to observe changes inflicted on different COD size fractions by chemical conditioning. The chemically enhanced membrane process achieved 95% COD removal, reducing the effluent COD to 6000–8000 mg L−1 range and the total phenol down to 100 mg L−1. Chemical conditioning also removed a significant portion of soluble COD, so that the resulting PSD fingerprint in the effluent was properly reshaped to allow effective removal by membrane treatment. CONCLUSION: The investigated treatment schemes involving pretreatment of oil wastewater by chemical conditioning together with membrane filtration offered high COD reduction in the effluent and biodegradable permeate when properly diluted for co-treatment with a compatible wastewater stream. The use of chemical conditioning prior to membrane filtration improved final permeate quality and ultrafiltration membrane flux.

Original languageEnglish
Pages (from-to)749-756
Number of pages8
JournalJournal of Chemical Technology and Biotechnology
Issue number4
Publication statusPublished - 1 Apr 2017

Bibliographical note

Publisher Copyright:
© 2016 Society of Chemical Industry


  • industrial effluents
  • membranes
  • nanofiltration
  • pretreatment
  • removal
  • ultrafiltration


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