Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 204, Issue -, Pages 613-621Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2017.09.046
Keywords
Competitive kinetics; Fenton reaction; Fluidized-bed Fenton; Oxidation pathway; Phenol-production wastewater
Categories
Funding
- Thailand Research Fund [TRG5780119]
- Center of Excellence on Hazardous Substance Management, Department of Environmental Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Bangkok, Thailand
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Phenol-production wastewater is difficult to treat biologically by aerobic processes to meet the effluent standard COD of 120 mg L-1 because it contains several highly refractory aromatic pollutants, particularly dimethyl phenyl carbinol. Pretreatment revealed that dimethyl phenyl carbinol was slowly oxidized by molecular ozone; however, it readily reacted with hydroxyl radicals to yield acetophenone as a primary product. Acetophenone was further oxidized, first through five different pathways to form benzoic acid, phenyl glyoxalic acid, 4-4 '-diacetyl biphenyl, and several hydroxylated aromatic compounds, and later to aliphatic carboxylic acids via ring cleavage. Regardless of system configuration (homogeneous vs heterogeneous), operating mode (batch vs continuous), and chemical concentration, the average intrinsic rate constants were 1.05 x 10(10) and 9.29 x 10(9) M-1 s(-1) for dimethyl phenyl carbinol and acetophenone, respectively. (C) 2017 Elsevier Ltd. All rights reserved.
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