Method for treating organic wastewater by catalytic oxidation of a two-phase oxidant system
A technology of organic wastewater and catalytic oxidation, which is applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of complex operation and high cost, improve degradation rate, reduce impact, and improve catalytic oxidation efficiency effect
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Embodiment 1
[0053] Take 12mL of prepared ozone stock solution (13.5±0.5mg / L) in a brown sealed glass bottle, add 8mL of prepared 2,4-D stock solution (100ppm), add catalyst 3mg, PMS 2mM, let the mixture Stir at constant temperature at 25°C and react for 60 minutes. The degradation efficiencies of different catalysts for 2,4-D are shown in Table 1. The ozone stock solution adopts an ozone generator, and an ozone stream is passed into the water at a rate of 8 g / h for 8 to 10 minutes to obtain an ozone stock solution with a concentration of 13.5±0.5 mg / L.
[0054] It can be seen from Table 1 that the surface hydroxyl density of the LDH structure catalyst supporting transition metal oxide is high, and the reaction efficiency is also significantly enhanced. It can be seen from the table that the removal efficiency of organic matter is significantly enhanced by the LDH catalyst loaded with Cu and Co oxides. The LDH structure catalyst composed of MgAl greatly increases the surface hydroxyl den...
Embodiment 2
[0060] Using CuCoMgAl and FeCoMgAl catalysts with different transition metal ratios as heterogeneous catalysts, the experiment described in Example 1 was carried out, and the reaction time was 60 minutes. The degradation efficiencies of catalysts with different transition metal ratios to 2,4-D are shown in Table 2.
[0061] Table 2 The degradation efficiency of catalysts with different transition metal ratios to 2,4-D
[0062]
[0063] It can be seen from Table 2 that different transition metal ratios have a significant impact on the catalytic efficiency of the catalyst, but compared with the ternary and binary catalysts in Example 1, they all have better catalytic efficiency. It shows that the transition metal plays an important role in the catalytic activity of the catalyst, and the quaternary catalyst has a better catalytic effect than the ternary and binary catalysts.
Embodiment 3
[0065] On the basis of Example 1, the concentrations of the liquid-phase oxidant PMS and the gas-phase oxidant ozone were respectively changed, and 3 mg of the CuCoMgAl catalyst in Example 1 was added, and the reaction time was 60 minutes. The degradation efficiencies of 2,4-D with different concentrations of oxidants are shown in Table 3.
[0066] Table 3 Degradation efficiency of 2,4-D with different concentrations of oxidants
[0067]
[0068] It can be seen from Table 3 that the concentration of oxidant has a significant impact on the degradation efficiency of 2,4-D, but when the PMS concentration is above 1.5mM and the ozone concentration is above 11mg / L, a good treatment effect can be achieved, greatly reducing the response cost.
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