Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 318, Issue -, Pages 371-378Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.06.063
Keywords
Ethylenediamine-N,N '-disuccinic acid; Fenton process; Cyclohexanoic acid; (OH)-O-center dot; Redox potential
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC) Senior Industrial Research Chair (IRC) in Oil Sands Tailings Water Treatment through Syncrude Canada Ltd.
- Suncor Energy Inc.
- Shell Canada
- Canadian Natural Resources Ltd.
- Total EP Canada Ltd.
- EPCOR Water Services
- IOWC Technologies Inc.
- Alberta Innovates - Energy and Environment Solution
- Alberta Environment and Parks
- Trojan Technologies
- NSERC
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Naphthenic acids (NAs) are reported to be the main species responsible for the oil sands process-affected water (OSPW) toxicity. In this study, the degradation of cyclohexanoic acid (CHA) as a model compound for NAs by an ethylenediamine-N,N'-disuccinic acid (EDDS)-modified Fenton process was investigated at pH 8. Optimum dose for Fe-EDDS (EDDS:Fe =2:1) was 0.45 mM, and 2.94 mM for hydrogen peroxide (H2O2). The time profiles of the main species in the process were studied, including CHA, H2O2, Fe(II), total Fe, and Fe-EDDS (in the main form of (FeEDDS)-E-III). The second-order rate constant between EDDS and hydroxyl radical ((OH)-O-center dot) at pH 8 was obtained as 2.48 +/- 0.43 x 10(9) M-1 s(-1). (OH)-O-center dot was proved to be the main species responsible for the CHA degradation, while superoxide radical (O-2(center dot-)) played a minor role. The consecutive addition of H2O2 and Fe-EDDS led to a higher removal of CHA compared to that achieved by adding the reagents at a time. The half-wave potential of (FeEDDS)-E-III/II was measured at pH 7-9. The EDDS-modified Fenton process is a promising alternative to degrade NAs. (C) 2016 Elsevier B.V. All rights reserved.
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