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Method of treating wastewater by catalyzing ozone to oxidize by using pyrite cinder

A pyrite slag and ozone oxidation technology, which is applied in the field of water treatment, can solve the problems of large dosage of ozone, low mineralization rate of organic matter, and insufficient ozone oxidation ability, and achieve low economic cost, stable properties, and reduced The effect of preparation costs

Active Publication Date: 2014-05-14
TONGJI UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of insufficient traditional ozone oxidation ability, low mineralization rate of organic matter in wastewater and large dosage of ozone, the present invention proposes a novel catalytic ozonation method for treating wastewater, with the purpose of improving the oxidation efficiency of ozone and reducing the production Economic Cost of Ozone Catalysts, Development of Cost-Effective Catalytic Ozone Oxidation Technology

Method used

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  • Method of treating wastewater by catalyzing ozone to oxidize by using pyrite cinder
  • Method of treating wastewater by catalyzing ozone to oxidize by using pyrite cinder
  • Method of treating wastewater by catalyzing ozone to oxidize by using pyrite cinder

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Effect test

Embodiment 1

[0026] Catalyst preparation: sieve pyrite slag to obtain slag particles with a particle size of 100-200 mesh, and sieve out particles with too large or too small particle sizes to obtain slag particles with uniform particle size; Add 100g of slag to 0.3L containing 0.1mol / L H 2 o 2 In acidic aqueous solution (pH 4), the solid-to-liquid ratio is about 1 ∶ 3. Slowly stir and wash for 3 hours, then settle for 1 hour and then separate the solid and liquid, and dry the obtained slag at 50°C for 4 hours; soak the dried slag in 0.5mol / L NaHCO 3 In the solution, the solid-to-liquid ratio was 1:2. After 20 hours, the supernatant was poured out, and the slag was dried at room temperature for later use.

[0027] Catalytic ozonation treatment of simulated dye wastewater: the experiment was divided into three parallel samples, and 2L of simulated wastewater containing active black 5 with an initial concentration of 100mg / L was added to the three reactors (pH=7.0, COD 0 =54.6mg / L), no ca...

Embodiment 2

[0031] In 2L of simulated wastewater containing active black 5 with an initial concentration of 100mg / L, the initial pH values ​​were 3.0, 7.0, and 10.0, respectively (COD 0 =54.6mg / L), add 2.5g / L activated pyrite slag (prepared according to the method in Example 1), feed 2mg / min of ozone at room temperature, and the reaction time is 1h. The dosage is 40mg / L, record the concentration and COD value of activated black 5 after treatment, and the effect of ozone oxidation treatment using activated pyrite slag as catalyst is shown in the table below, which shows that pyrite slag catalyzes ozone oxidation It has a relatively wide pH range.

[0032] Table 2 Catalytic ozone oxidation of pyrite slag under different pH conditions in the treatment of reactive black 5 simulated dye wastewater

[0033]

Embodiment 3

[0035] Catalyst preparation: sieve pyrite slag to obtain slag particles with a particle size of 100-200 mesh. Add 100g of the sieved slag to 0.5L of H containing 0.4mol / L 2 o 2Acidic aqueous solution (pH 4) was stirred and washed at a slow speed for 5 hours, the solid-liquid ratio was about 1:5, and then the solid-liquid separation was carried out after static precipitation for 1 hour, and the obtained slag was dried at 50°C for 4 hours; the dried slag was dried Soak the slag in 0.8mol / L NaHCO 3 After 24 hours in the solution, the solid-to-liquid ratio was 1:1, the supernatant was poured out, and the slag was dried at room temperature for later use.

[0036] Catalytic ozonation treatment of simulated dye wastewater: 2L of simulated wastewater containing reactive black 5, reactive brilliant red X-3B, and acid scarlet with an initial concentration of 200mg / L at an initial pH value of 7.0 (COD 0 109.34mg / L, 112.23mg / L, 102.57mg / L), add 5g / L activated pyrite slag, inject 2mg / mi...

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Abstract

The invention relates to a method of treating wastewater by catalyzing ozone to oxidize by using pyrite cinder, wherein the oxidizing efficiency of ozone is improved, the economic cost of preparing an ozone catalyst is lowered, and the economic and efficient catalytic ozonation technology is developed. The core of the method provided by the invention is as follows: chemical cinder, namely pyrite cinder is used and after being subjected tosimple activating treatment, the pyrite cinder is used for catalyzing ozone to oxidize, so that treatment of wastes with processes of wastes against one another is carried out. The pyrite cinder is developed to a novel ozone catalyst with high catalytic activity for heterogeneous catalytic ozonation treatment of wastewater by virtue of an activating method of controlling critical process parameters and inventing the catalyst. Compared with the prior art, according to the method provided by the invention, pyrite cinder is simply activated to use, so that the preparation process is simple, the catalytic activity is high, and no other metals are loaded additionally, thereby greatly lowering the economic cost of the catalyst while improving the catalytic efficiency.

Description

technical field [0001] The invention belongs to the field of water treatment, in particular to a method for treating wastewater by catalytic ozone oxidation using pyrite slag. Background technique [0002] In recent years, with the rapid development of industry and agriculture, a large amount of waste water or sewage has been produced, and direct discharge into natural water bodies will cause irreversible environmental quality degradation; at the same time, in order to meet human needs, chemical synthesis technology has advanced by leaps and bounds, and a large number of new chemical products are widely used Applications. With the increase of wastewater volume and the complexity of water quality, it is difficult for traditional water treatment methods to achieve complete harmlessness, and even cause the inactivation of traditional biological treatment methods, resulting in the deterioration of effluent water quality. With the increasingly stringent environmental emission st...

Claims

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Application Information

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IPC IPC(8): C02F1/78
Inventor 吴德礼何宏平张亚雷
Owner TONGJI UNIV
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