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Treatment of a Trifluraline Effluent by Means of Oxidation‐Coagulation with Fe(VI) and Combined Fenton Processes
Author(s) -
Martins Ayrton F.,
da S. Frank Carla,
Wilde Marcelo L.
Publication year - 2007
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.200600017
Subject(s) - hydrogen peroxide , chemistry , response surface methodology , effluent , central composite design , quadratic model , coagulation , nuclear chemistry , chromatography , environmental engineering , biochemistry , psychology , psychiatry , engineering
The amination water (AW) effluent stream from the industrial production of the trifluraline herbicide was submitted to an oxidation‐coagulation treatment with potassium ferrate, combined with advanced oxidation processes. The experimental results obtained by analysis of variance (ANOVA) for the oxidation‐coagulation‐Fenton process, evaluating the variables pH ( A ), Fe(VI) concentration ( B ), and H 2 O 2 concentration ( C ), demonstrated that the regression equation resulting from the Response Surface Methodology (RSM) experimental design, for the quadratic model, was η Abs (%) = 36.9– 21.58 A + 8.37 A 2 + 1.36 B + 0.92 B 2 + 1.08 C + 1.52 C 2 + 1.27 AB – 1.34 AC + 1.33 BC . The maximum absorptiometric color reduction occurred at pH 3, with corresponding maximum amounts of iron and hydrogen peroxide. The absorptiometric color and COD reduction were 96% and 57%, respectively. For the oxidation‐coagulation‐photo‐Fenton process, the analyzed variables were pH ( A ), Fe(VI) concentration ( B ), H 2 O 2 concentration ( C ), and temperature ( D ). The regression equation resulting from the quadratic model was η Abs (%) = 38.3 – 20.2 A + 8.12 A 2 – 0.27 B + 3.73 B 2 + 0.3 C + 3.6 C 2 + 1.67 D + 3.1 D 2 + 1.72 AB + 0.51 AC – 1.82 AD + 0.74 BC – 1.11 BD + 0.03 CD . The ANOVA response showed that the highest absorptiometric color reduction occurred at pH 3, with respective maximum amounts of iron and hydrogen peroxide at 60°C. The maximum efficiencies achieved by the proposed treatment process for the trifluraline effluent stream were 95% and 85%, for absorptiometric color and COD reduction, respectively.