Preparation method of ozone oxidation catalyst for treating coal gasification wastewater
A technology for coal gasification wastewater and ozone oxidation, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve difficult recovery, impurity dissolution and low catalytic efficiency and other problems, to achieve the effect of simple preparation method, diverse application methods and high catalytic activity
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Embodiment 1
[0029] The mass ratio of 20% NiAl-LDH, 20% CoAl-LDH, 20% NiFe-LDH, 10% CuAl-LDH, 10% ZnAl-LDH, 10% MgFe-LDH, 10% MgAl -The calcination temperature and calcination time of LDH in the muffle furnace were respectively set as 450°C, 2h; 450°C, 4h; 550°C, 4h; 350°C, 2h; 500°C, 4h; 430°C, 2h; 4h. The prepared ozonation catalyst is obtained by grinding and pulverizing the dried and fluffy catalyst precursor components after roasting and uniformly mixing them together. The dosage of the catalyst in the ozone catalytic oxidation experiment was set to 11g / L.
[0030] Take 1000ml of water sample, and continuously aerate the ozone reaction, the ozone flow rate is 0.7L / min, the reaction time is 40min, and the pH value is 7.8. Wastewater initial water quality index: COD Cr It is 136.7mg / L, the chromaticity is 400 times, and the turbidity is 0.80NTU; the water quality COD after treatment Cr The removal rate of chroma is 98.0%, the removal rate of chroma is 99.0%, and the removal rate of ...
Embodiment 2
[0033] Put 20% NiAl-LDH, 20% CoAl-LDH, 30% NiFe-LDH, 10% CuAl-LDH, 10% ZnAl-LDH, 10% MgFe-LDH in the muffle furnace The calcination temperature and calcination time were set as 450℃, 5h; 450℃, 4h; 550℃, 4h; 400℃, 3h; 500℃, 6h; 430℃, 4h. The ozonation catalyst is obtained by grinding and pulverizing the dried and fluffy catalyst precursor components evenly and then mixing them together. The dosage of the catalyst in the ozone catalytic oxidation experimental system was set at 20g / L.
[0034] Take 1000ml of water sample, and continuously aerate the ozone reaction, the ozone flow rate is 0.6L / min, the reaction time is 30min, and the pH value is 8.1. Wastewater initial water quality index: COD Cr It is 132.6mg / L, the chromaticity is 400 times, and the turbidity is 0.85NTU; the water quality COD after treatment Cr The removal rate of chroma is 92.7%, the removal rate of chroma is 99.0%, and the removal rate of turbidity is 82.4%.
[0035] The catalyst that has been used or used...
Embodiment 3
[0037] Put 20% NiAl-LDH, 30% CoAl-LDH, 20% NiFe-LDH, 10% CuAl-LDH, 10% ZnAl-LDH, 10% MgFe-LDH in the muffle furnace The calcination temperature and calcination time were set as 450℃, 3h; 450℃, 4h; 550℃, 4h; 550℃, 5h; 500℃, 4h; 430℃, 5h. The ozone catalyst is obtained by grinding and pulverizing the dried and fluffy catalyst precursor components evenly after roasting and mixing them together. The dosage of the catalyst in the ozone catalytic oxidation system is set to 18g / L.
[0038] Take 1000ml of water sample, and continuously aerate the ozone reaction, the ozone flow rate is 0.5L / min, the reaction time is 60min, and the pH value is 8.6. Wastewater initial water quality index: COD Cr It is 128.1mg / L, the chromaticity is 400 times, and the turbidity is 0.83NTU; the water quality COD after treatment Cr The removal rate of 93.1%, the removal rate of color is 99.0%, and the removal rate of turbidity is 86.1%.
[0039] The catalyst that has been used or used many times is drie...
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