The aim of this study was to
investigate the applicability of Fenton process and combined ozone/Fenton
process to remove color, soluble chemical oxygen demand (CODs),
phenol, and dissolved organic carbon (DOC) from real olive mill wastewater
(OMW). The treatability of OMW was investigated in three different study parts.
Initially, Fenton process was optimized under varying H2O2/Fe2+
molar ratios ranging between 10 and 20 at the constant H2O2
concentration of 0.5 mM. The H2O2/Fe2+ molar
ratio of 10 was found optimum providing high color (51.6 %), CODs
(58%), DOC (27.9%) and phenol removals (93.9%). Further, combined ozone/Fenton
process was applied under gradually increasing dosages of Fe2+ and H2O2
reagents at constant H2O2/Fe2+ molar ratio of
10. The high color removal efficiency (51.6% color removal for Pt-Co) was obtained at the H2O2
and Fe2+ molar ratio of 0.5/0.05. Additionally, CODs,
color, DOC and phenol removal efficiencies improved at increasing reagents
concentrations. However, the color removal efficiency was adversely affected
while no significant difference on CODs and phenol removal was
observed at higher concentrations of molar concentrations above 0.5/0.05.
Additionally, the results indicated that combined process enhanced treatment
performance of OMW by 21%, 49% and 22% in terms of color, DOC and CODs
removals, respectively, compared to only-Fenton process. In the rest of this
study, combined ozone/Fenton process was optimized under varying ozonation time
(60-120 min) at the optimum H2O2 and Fe2+molar
dosage of 0.5/0.05 obtained from previous parts. Ozonation time significantly
affected the treatment performance, and optimum the reaction time was
determined as 90 minute in terms of the high treatment productivity and low
operating cost resulted from minimum ozone consumption and short reaction time.
COD removal Color removal Ozone/Fenton process Olive mill wastewater Phenol removal Phenol removal
Primary Language | English |
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Subjects | Engineering |
Journal Section | Research Article |
Authors | |
Publication Date | June 30, 2018 |
Submission Date | August 24, 2017 |
Acceptance Date | February 13, 2018 |
Published in Issue | Year 2018 |
Aksaray J. Sci. Eng. | e-ISSN: 2587-1277 | Period: Biannually | Founded: 2017 | Publisher: Aksaray University | https://asujse.aksaray.edu.tr
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