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- W2350593980 abstract "Ozonation and H2O2-NaOH advanced oxidation processes were used to treat high content manganese-containing wastewater based on optimal redox potential(ORP). The effects of oxidizer(ozone, H2O2 and NaOH) dosages, and the oxidation kinetics were investigated. Experimental results indicated that the ORP was 296～299.7 mV in the ozonation oxidation, under addition of ozone at 0.13～0.15 g/L in both first and second ozonation oxidation processes, the removal rate of Mn2+ reached 91.57%. The ORP was 12.40～12.80 mV in the H2O2-NaOH oxidation, when the dosages of H2O2 and NaOH were 2.0 and 2.6 g/L respectively, their molar ratio was 0.9:1 and H2O2 was added first, the removal rate of Mn2+ reached 99.31%. The treated wastewater had the Mn2+ concentration of 1.2 mg/L which was lower than the first level standard(2.0 mg/L) specified in the National Wastewater Discharge Standard GB 8978-1996. The oxidation kinetics indicated that the oxidation processes obeyed first order reaction kinetics. The rate constant k was 0.076 2 min-1for the first ozonation oxidation and 0.082 2 min-1 for the second one at set ORP, otherwise k was 0.027 9 and 0.050 8 min-1, respectively. k was 0.475 8 min-1 for the H2O2-NaOH oxidation at set ORP, otherwise k was 0.3594 min-1." @default.
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- W2350593980 date "2014-01-01" @default.
- W2350593980 modified "2023-09-23" @default.
- W2350593980 title "Treatment of High Content Manganese-containing Wastewater by O3-H2O2 Oxidation Based on Optimal Redox Potential" @default.
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