Comparison of acoustic and hydrodynamic cavitation based hybrid AOPs for COD reduction of commercial effluent from CETP
| Autor: | Parag R. Gogate, Aniruddha B. Pandit, Chandrodai Agarkoti |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Best fitting Materials science 0208 environmental biotechnology Analytical chemistry 02 engineering and technology 010501 environmental sciences Management Monitoring Policy and Law Kinetic energy 01 natural sciences Reduction (complexity) Pseudo first order Waste Management and Disposal Effluent 0105 earth and related environmental sciences Biological Oxygen Demand Analysis Kinetic model Chemical oxygen demand Acoustics Hydrogen Peroxide General Medicine 020801 environmental engineering Kinetics Cavitation Hydrodynamics Oxidation-Reduction Water Pollutants Chemical |
| Zdroj: | Journal of Environmental Management. 281:111792 |
| ISSN: | 0301-4797 |
| DOI: | 10.1016/j.jenvman.2020.111792 |
| Popis: | The present work investigates the treatment of commercial effluent obtained from Common Effluent Treatment Plants (CETP) using acoustic cavitation (AC) and hydrodynamic cavitation (HC) based hybrid AOPs. Comparison of different hybrid AOPs viz. H2O2, Fe2+/H2O2, Fe2+/H2O2/Air, Fe2+/H2O2/S2O82− and Fe2+/H2O2/S2O82−/Air in combination with both AC and HC has been performed in terms of extent of chemical oxygen demand (COD) reduction and kinetic rate constants. The best results of COD reduction as 95.2% and 97.28% were obtained for AC/Fe2+/H2O2/Air and HC/Fe2+/H2O2/Air systems respectively at Fe2+/H2O2 ratio of 0.1 and pH of 2 within 60 min of treatment under conditions of ultrasonic power dissipation as 150 W, inlet pressure for HC as 4 bar (as applicable depending on process) and temperature of 30 ± 2 °C. Slightly lower efficacy was established for the combination approach involving AC or HC coupled with Fe2+-activated S2O82− and H2O2 yielding COD reduction of 82.9% and 86.93% for the AC/Fe2+/H2O2/S2O82−/Air and HC/Fe2+/H2O2/S2O82−/Air systems respectively at Fe2+/H2O2/S2O82− ratio of 1:40:17.5. Cost estimation on the basis of cavitational yield performed on the AC and HC based treatment systems revealed economical nature of HC based treatment. Kinetic studies were also performed by fitting the experimental data with pseudo first order kinetic model (PFOKM), generalized kinetic model (GKM) and Behnajady-Modirshahla-Ghanbery kinetic model (BMGKM). It was demonstrated that GKM provided best fitting for all the experiments whereas BMGKM was most suitable for Fenton based reactions. It was clearly established that complex CETP effluent can be effectively treated using the combined approaches based on HC with potential for larger scale operation. |
| Databáze: | OpenAIRE |
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