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Oxidative processes for olive mill wastewater treatment.

E Bettazzi1, C Caretti, S Caffaz

  • 1Department of Civil Engineering, University of Florence, Via Santa Marta 3, 50139 Florence, Italy. elena@dicea.unifi.it

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|June 15, 2007
PubMed
Summary

This study evaluated physical and advanced oxidation processes for treating olive oil mill wastewater. Ozone oxidation proved most effective for removing total polyphenols and enhancing biodegradability for subsequent biological treatment.

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Area of Science:

  • Environmental Chemistry
  • Water Treatment Technologies

Background:

  • Olive oil mill wastewater (OMW) presents significant environmental challenges due to high organic and phenolic content.
  • Effective treatment methods are crucial to mitigate the ecological impact of OMW.

Purpose of the Study:

  • To investigate the efficiency of lime coagulation, ozone oxidation, and Fenton's process for OMW treatment.
  • To assess the degradation of organic and phenolic compounds in OMW.
  • To evaluate the impact of these treatments on the biodegradability of OMW.

Main Methods:

  • Experimental investigation of lime coagulation, ozone oxidation, and Fenton's process.
  • Analysis of total polyphenols (TP) and chemical oxygen demand (COD) removal.
  • Assessment of biodegradability using respirometric (BOD) and anaerobic batch tests.

Main Results:

  • Lime coagulation achieved 37% TP and 26% COD reduction at pH 12.
  • Ozone oxidation showed high efficiency (91% TP, 19% COD reduction) at pH 12.
  • Fenton's process achieved 60% TP removal, while ozone was more effective.
  • Treated OMW exhibited significantly enhanced biodegradability, with up to 8x higher methane production in anaerobic tests.

Conclusions:

  • Ozone oxidation is a highly effective method for removing phenolic compounds from OMW.
  • Pre-treatment with oxidation processes significantly improves the biodegradability of OMW.
  • Advanced oxidation processes offer a viable solution for sustainable OMW management.