Treatability of phenol-production wastewater: Rate constant and pathway of dimethyl phenyl carbinol oxidation by hydroxyl radicals
| Autor: | Tuksinaiya Pobsuktanasub, Atsawin Joysampao, Chalermchai Ruangchainikom, Jin Anotai, Nonglak Boonrattanakij |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Environmental Engineering
Ozone Radical Carboxylic Acids 02 engineering and technology Wastewater 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences chemistry.chemical_compound Reaction rate constant Organic chemistry Phenol Waste Management and Disposal Benzyl Alcohols 0105 earth and related environmental sciences Benzoic acid Biphenyl Hydroxyl Radical Chemistry General Medicine 021001 nanoscience & nanotechnology Yield (chemistry) 0210 nano-technology Oxidation-Reduction Water Pollutants Chemical Acetophenone |
| Zdroj: | Journal of Environmental Management. 204:613-621 |
| ISSN: | 0301-4797 |
| DOI: | 10.1016/j.jenvman.2017.09.046 |
| Popis: | 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 × 10 10 and 9.29 × 10 9 M −1 s −1 for dimethyl phenyl carbinol and acetophenone, respectively. |
| Databáze: | OpenAIRE |
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