| Dyeing wastewater with a large amount of water, high levels of organic pollutants, deep color, strong alkaline, changes in water quality, the poor characteristics of biodegradability of industrial wastewater are intractable. Anthraquinone dyes are the largest use of reactive dyes in textile printing and dyeing industry, after azo dyes. Due to the high water-solubility, it is not easily adsorbed on the activated sludge, and has an extremely stable chemical structure, traditional wastewater treatment process is difficult to decompose quickly and efficiently. Therefore, it is very important to research such dye wastewater treatment methods.This paper used Reactive Brilliant Blue P-3R as experimental target, investigated two different system degradation of dye wastewater oxidation process of O3/H2O2and potassium ferrate/O3/H2O2. For the primary purpose of the dye wastewater quick decolorization and TOC removal, explore the interaction and the impaction of various factors, determine the system optimal conditions, and analysis the mechanism of potassium ferrate/O3/H2O2collaborative dyeing wastewater treatment. The results showed that:(1) The analysis of O3/H2O2system degradation of Reactive Brilliant Blue P-3R influencing factorsIn O3/H2O2system, the reaction time is longer, the removal is higher; there is an optimum value of hydrogen peroxide dosage, too high or too low will affect the treatment effect of the oxidation reaction; the same as the total dosage of1mL of hydrogen peroxide, one-time full dosing is better than the effect of repeated dosing in different time periods; the initial pH value of the dye wastewater is higher, the TOC removal rate is higher; by adding a small amount of tert-butanol, indicated that the hydroxyl radical is the dominant role in the oxidation reaction of O3/H2O2.(2) The establishment of the potassium ferrate/O3/H2O2system and the analysis of influencing factors in degradation of Reactive Brilliant Blue P-3RBy comparing different oxidation system oxidative degradation of Reactive Brilliant Blue P-3R treatment effect under the same conditions, decolorization rate of Reactive Brilliant Blue P-3R and TOC removal as an indicator comprehensive evaluation of the efficiency of the oxidation, known oxidative capacity in the order that:potassium ferrate/O3/H2O2> the potassium ferrate/03> O3/H2O2> O3> potassium ferrate/H2O2> potassium ferrate> H2O2. Therefore, the establishment of the system is reasonable.In potassium ferrate/O3/H2O2system, decolorization and TOC removal rate increases with increasing reaction time; potassium ferrate/hydrogen peroxide has the best value, it is need to be tested to determine; the pH is higher, the effect of oxidative degradation is better; the inorganic anions in water also have an impact on the oxidation effects, reduce oxidation effect; with different concentrations of t-butanol in the solution, the removal rate increased with tert-butanol concentration lower, it indicates tert-butanol is obvious inhibition of hydroxyl radical, oxidation hydroxyl radicals in the potassium ferrate/O3/H2O2system is a major role.(3) The oxidation mechanism analysis of potassium ferrate/O3/H2O2degradation of Reactive Brilliant Blue P-3RThe method uses potassium ferrate oxidation and flocculation, ozone direct oxidation and indirect oxidation, synergy between potassium ferrate and ozone, fenton reaction of potassium ferrate and hydrogen peroxide formed; ozone and hydrogen peroxide produced by the oxidation of the hydroxyl radical, destroy the dye chromophore, fracture macromolecules to generate small molecular and colorless degradation intermediates, even eventually degrade into CO2and H2O, achieve the purpose of decolorization and degradation of organic. |
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