Abstract
ABSTRACT
The objective of this research was to investigate the use of basic oxygen furnace slag (BOF slag), a final waste slurry of steel making plants, with hydrogen peroxide to degrade 2,4-dichlorophenol wastewater. In an acid solution, BOF slag can be dissociated to produce ferrous ions and react with hydrogen peroxide to produce hydroxyl radicals and degrade 2,4-dichlorophenol. Various factors deemed critical in the degradation of 2,4-dichlorophenol were studied, including hydrogen peroxide dosage, concentration of BOF slag, initial concentration of 2,4-dichlorophenol, and pH value of solution. Experimental results proved that 100 mg/L 2,4-dichlorophenol and its oxidation intermediate could be totally decomposed within 2 h by 20 g/L BOF slag, 103 mM hydrogen peroxide, and pH = 2.8. The degradation process is better at higher BOF slag concentration, and the optimum hydrogen peroxide dosage is 52 mM. The best pH value is in the vicinity of 2.8. A degradation reaction mechanism was proposed for predicting the concentration changes of 2,4-dichlorophenol, ferrous ion, and hydrogen peroxide. The rate constants were calculated using the Rosen-Brock Optimization Algorithm with fourth-order Runge-Kutta method based on the proposed reaction mechanism and experimental data.
Key words:
Furnace slag; hydrogen peroxide; 2,4-dichlorophenol; ferrous ion
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