Photo-Fenton Treatment of Olive Mill Wastewater Applying a Combined Fenton/Flocculation Pretreatment

[+] Author and Article Information
W. Gernjak1

 CIEMAT—Plataforma Solar de Almería, P.O. Box 22, 04200, Tabernas, SpainWolfgang.Gernjak@psa.es

T. Krutzler

 Austrian Environmental Federal Agency, Dept. Integrated Plant Studies, Spittelauer Lände 5, 1090 Vienna, Austria

R. Bauer

 Vienna Technical University, Institute of Materials Chemistry, Veterinärpl. 1, 1210 Vienna, Austria


Corresponding author.

J. Sol. Energy Eng 129(1), 53-59 (Dec 07, 2005) (7 pages) doi:10.1115/1.2391132 History: Received July 19, 2005; Revised December 07, 2005

In this work, a pretreatment involving a combination of acidification, the Fenton method, and flocculation with polyelectrolytes was successfully applied to remove the suspended solids of Olive mill wastewater (OMW). This pretreatment strongly augmented the reaction rate in the following photo-Fenton treatment under solar irradiation in a Compound Parabolic Collector pilot-plant at Plataforma Solar de Almería. The content in phenolic substances could be degraded down to zero, while DOC was degraded down to about 25% of the initial value. In the work we describe different aspects concerning the process parameters of the pretreatment and the photo-Fenton treatment. Furthermore, decrease in phytotoxicity in the course of the treatment was monitored by germination tests with barley (hordeum vulgare L.). The results indicate that acute phytotoxicity can be substantially reduced by the application of the above mentioned pretreatment, enabling OMW to be used for ferti-irrigation in agriculture.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

DOC, COD, DPI, and H2O2 consumption evolution in experiment E6. Values at Q=−20kJL−1 and Q=−10kJL−1 are the analysis values after the pretreatment and an initial Fenton reaction in the plant without the collectors exposed to sunlight.

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Figure 2

H2O2 consumption rate as a function of reaction solution temperature. For the calculation of H2O2UV, refer to the text.

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Figure 3

DOC degradation as a function of H2O2 consumption in different experiments

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Figure 4

GI as a function of EC of salt solutions (NaCl:KCl:Na2SO4=2:2:10–10gL−1) and OMW samples (see also Table 3): (1) no treatment, DOC 23gL−1; (2) after pretreatment, DOC 21gL−1; (3) during photo-Fenton, DOC 17.1gL−1; (4) during photo-Fenton, DOC 15.0gL−1; (5) during photo-Fenton, DOC 4.8gL−1.




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