Optimizing a quad-oxidant hybrid process based on hydrodynamic cavitation and UV radiation for Allura red degradation
This research investigated Allura Red (AR) degradation using a quad-oxidant hybrid process with hydrodynamic cavitation (HC) promoted by ultraviolet radiation (UV) in combination with sodium peroxydisulfate (PS) and hydrogen peroxide (H2O2) as chemical agents. The experiments were carried out for 4 ...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-06-01
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| Series: | Water Resources and Industry |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2212371725000113 |
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| Summary: | This research investigated Allura Red (AR) degradation using a quad-oxidant hybrid process with hydrodynamic cavitation (HC) promoted by ultraviolet radiation (UV) in combination with sodium peroxydisulfate (PS) and hydrogen peroxide (H2O2) as chemical agents. The experiments were carried out for 4 L synthetic AR-polluted wastewater containing 25 ppm AR. Optimization was performed using a Box-Behnken design (BBD) with H2O2 (0–70 ppm), PS (0–200 ppm), and UV radiation (0–32 W). Response surface methodology (RSM) analysis revealed optimal conditions for the HC/H2O2/PS/UV process as 41.3 ppm H2O2, 197 ppm PS, and 31.7 W UV power. Under these conditions, 99.23 % decolorization efficiency with a kinetic rate constant (k) of 80.53 × 10−3 min−1 and yield efficiency of 9.90 × 10−3 mg kJ−1 was achieved. The optimum configuration also resulted in remarkable 74.33 % reduction of Chemical Oxygen Demand (COD) within 120 min. Techno-economic analysis, based on the efficiency-cost ratio (ECR) was conducted on all processes revealed that the ECR of the optimized HC/H2O2/PS/UV process was attained at 398.40. To clarify the role of reactive species, the influence of radical scavengers was investigated under the optimized conditions. Decolorization efficiency was reduced to 74.53 % and 53.10 % with the addition of tert-butanol and ethanol, respectively, with corresponding rate constants of 22.8 × 10−3 min−1 and 12.62 × 10−3 min−1. |
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| ISSN: | 2212-3717 |