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Preparation method and application of magnetic sludge-based ozone catalyst

A catalyst and sludge technology, which is applied in the fields of waste resource utilization and environmental engineering, can solve the problem of low catalyst activity, and achieve the effects of simple operation, low energy consumption and easy separation

Active Publication Date: 2014-04-02
云南聚光科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if this method is applied to porous carbonized sludge loaded with metal oxides to prepare ozone catalysts, there will be problems because the carbon in the carbonized sludge will be oxidized at high temperature to CO2 under high temperature and aerobic conditions. 2 And the disappearance of defects, at the same time, if anaerobic calcination is used, it is difficult to obtain a highly active metal oxide crystal form, because the calcination method is first impregnated with metal ions on the solid, and then calcined under oxygen conditions to obtain metal oxides , high temperature conditions are mainly used to obtain highly active crystal forms; and potassium permanganate reduction precipitation method has been widely used in the preparation of ozone catalysts due to its advantages of low energy consumption, mild reaction conditions, simple process and process control. Catalysts prepared by precipitation method have low activity

Method used

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  • Preparation method and application of magnetic sludge-based ozone catalyst
  • Preparation method and application of magnetic sludge-based ozone catalyst
  • Preparation method and application of magnetic sludge-based ozone catalyst

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Embodiment 1

[0026] The preparation method of the magnetic sludge base ozone catalyst of the embodiment of the present invention, described preparation method comprises the following steps:

[0027] (A1) Add 50mL of 0.2% (mass percentage) manganese nitrate solution to 3.5g of modified sludge, stir and mix, then let it stand for immersion for 2 hours, transfer it to the ozone reaction device, and inject ozone (flow rate is less than 0.1L / min), And vigorously stirred for 150min, then poured the reaction liquid into a high-pressure reaction kettle, placed in an oven at a temperature of 200°C, and took 8h. After the hydrothermal reaction, it was naturally cooled to room temperature, washed with water, and dried to obtain a dirty mud-based catalyst;

[0028] (A2) Weigh FeCl 3 .6H 2 O: Dissolve 5.40g in 20mL distilled water and weigh FeSO at the same time 4 ·7H 2O: 2.78g dissolved in 20mL distilled water;

[0029] FeCl 3 Aqueous solution, FeSO 4 Mix the aqueous solution while vigorously s...

Embodiment 2

[0033] The preparation method of the magnetic sludge base ozone catalyst of the embodiment of the present invention, described preparation method comprises the following steps:

[0034] (A1) Add 50mL of 0.5% (mass percentage) manganese nitrate solution to 3.5g of modified sludge, stir and mix, then let it stand for immersion for 2h, transfer to the ozone reaction device, and pass into ozone (flow rate is less than 0.1L / min), And vigorously stirred for 150min, then poured the reaction liquid into a high-pressure reaction kettle, placed in an oven at a temperature of 200°C, and took 8h. After the hydrothermal reaction, it was naturally cooled to room temperature, washed with water, and dried to obtain a dirty mud-based catalyst;

[0035] (A2) Weigh FeCl 3 .6H 2 O: Dissolve 5.40g in 20mL distilled water and weigh FeSO at the same time 4 ·7H 2 O: 2.78g dissolved in 20mL distilled water;

[0036] FeCl 3 Aqueous solution, FeSO 4 Mix the aqueous solution while vigorously stirr...

Embodiment 3

[0040] The preparation method of the magnetic sludge base ozone catalyst of the embodiment of the present invention, described preparation method comprises the following steps:

[0041] (A1) Add 50mL of 0.2% (mass percentage) manganese nitrate solution to 3.5g of modified sludge, stir and mix, then let it stand for immersion for 24 hours, transfer to the ozone reaction device, and pass through ozone (flow rate is less than 0.1L / min), And vigorously stirred for 150min, then poured the reaction liquid into a high-pressure reaction kettle, placed in an oven at a temperature of 200°C, and took 8h. After the hydrothermal reaction, it was naturally cooled to room temperature, washed with water, and dried to obtain a dirty mud-based catalyst;

[0042] (A2) Weigh FeCl 3 ·6H 2 O: Dissolve 5.40g in 20mL distilled water and weigh FeSO at the same time 4 ·7H 2 O: 2.78g dissolved in 20mL distilled water;

[0043] FeCl 3 Aqueous solution, FeSO 4 Mix the aqueous solution while vigorou...

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Abstract

The invention discloses a preparation method of a magnetic sludge-based ozone catalyst. The preparation method comprises the following steps: (A1), mixing modified sludge with a manganese nitrate solution, standing for 2-48 hours, introducing ozone into the solution and stirring, placing reaction liquid in a reaction kettle in an oven and performing hydrothermal reaction at the temperature of 100-300 DEG C for 6-10 hours, naturally cooling to room temperature after the hydrothermal reaction, cleaning, and drying to obtain the sludge-based catalyst; and (A2) respectively preparing a FeCl3 aqueous solution and a FeSO4 aqueous solution, uniformly mixing the FeCl3 aqueous solution and the FeSO4 aqueous solution and sufficiently stirring so that the mol concentration ratio of the Fe<3+> to Fe<2+> in the mixed solution is 2: 1, adding ammonium hydroxide to the mixed solution and stirring to guarantee that the pH value is 11-12, adding the sludge-based catalyst and stirring, performing water-bath aging, rinsing and drying to obtain the magnetic sludge-based ozone catalyst. The preparation method is simple to operate, environmentally friendly, low in cost and has industrial application prospect.

Description

technical field [0001] The invention relates to a method for preparing a magnetic sludge-based ozone catalyst by utilizing excess sludge of a sewage treatment plant, and belongs to the technical fields of waste resource utilization and environmental engineering. Background technique [0002] With the continuous improvement of urban sewage treatment rate, the amount of sludge produced by sewage treatment plants is also gradually increasing, and the amount of sludge contained in every 10,000 tons of wastewater is as high as 6 to 7 tons. However, the investment and operating costs of sludge treatment are large, accounting for more than 50% of the total operating costs of the entire sewage plant. Therefore, it is of great practical and environmental significance to seek economical, efficient and safe sludge treatment and disposal technologies. Currently, the commonly used sludge disposal methods include landfill and incineration. Landfill not only occupies a large amount of la...

Claims

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Application Information

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IPC IPC(8): B01J23/889C02F1/78C02F101/30
Inventor 李红石
Owner 云南聚光科技有限公司
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