Abstract
Emerging combination of hydrodynamic cavitation and dual oxidant chemical system (HC-KPS-H2O2), was used for decolorization and mineralization of Coomassie Brilliant Blue (CBB) in wastewater. Investigation were conducted on the effect of HC inlet pressure (4–8 bar), hydrogen peroxide (H2O2) concentration (0–1000 mg L−1) and potassium persulfate (KPS) concentration (0–1000 mg L−1) via experimental design using Box-Behnken Design (BBD). Furthermore, synergistic effects of various combinations (HC-KPS, HC-H2O2, KPS-H2O2, and HC-H2O2-KPS) was determined through decolorization kinetics as well as mineralization tests. Beneficial effects for simultaneous utilization of H2O2 and KPS in combination with HC were addressed. A remarkable 92% decolorization and 73.2% mineralization in 60 min was attained at HC inlet pressure, H2O2 concentration and KPS concentration equal to 7.1 bar, 676.1 mg L−1 and 541.1 mg L−1, respectively. The maximum obtained first order rate constant was 9.2 × 10−3 min−1 leading to a synergistic coefficient of 3.04 using HC-H2O2-KPS combined process.
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