Optimization of Collaborative Photo-Fenton Oxidation and Coagulation for the Treatment of Petroleum Refinery Wastewater with Scrap Iron
Document Type
Article
Publication Date
1-1-2017
Publication Title
Water, Air, and Soil Pollution
Volume
228
Issue
8
Abstract
The photo-Fenton oxidation treatment combined with a coagulation/flocculation process was investigated for removal of chemical oxygen demand (COD) from a refractory petroleum refinery wastewater. Scrap iron shavings were used as the catalyst source. A response surface methodology (RSM) with a cubic IV optimal design was employed for optimizing the treatment process. Kinetic studies showed that the proposed process could be described by a two-stage, second-order reaction model. Experiments showed that precipitation of iron ions can be utilized as a post-oxidation coagulation stage to improve the overall treatment efficiency. More than 96.9% of the COD removal was achieved under optimal conditions, with a post-oxidation coagulation stage accounting for about 30% of the removal, thus confirming the collaborative role of oxidation and coagulation in the overall treatment. A low-velocity gradient of 8.0 s−1 for a short mixing time of 10 min resulted in optimum post-oxidation coagulation. Comparison of photo-Fenton oxidation to a standard Fenton reaction in the same wastewater showed more rapid COD removal for photo-Fenton, with an initial second-order rate constant of 4.0 × 10−4 L mg−1 min−1 compared to the Fenton reaction’s overall second-order rate constant of 7.0 × 10−5 L mg−1 min−1. © 2017, Springer International Publishing AG.
Disciplines
Civil and Environmental Engineering
File Format
File Size
4380 KB
Language
english
Repository Citation
Saber, A.,
Mortazavian, S.,
James, D. E.,
Hasheminejad, H.
(2017).
Optimization of Collaborative Photo-Fenton Oxidation and Coagulation for the Treatment of Petroleum Refinery Wastewater with Scrap Iron.
Water, Air, and Soil Pollution, 228(8),
http://dx.doi.org/10.1007/s11270-017-3494-2
