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Application of CaO/AC solid catalyst in catalysis of acetic acid in ozone oxidation wastewater

A solid catalyst and ozone oxidation technology, which is applied in the direction of oxidation water/sewage treatment, water/sewage treatment, water/sludge/sewage treatment, etc., to achieve the effect of low catalyst consumption, mild use conditions and good stability

Inactive Publication Date: 2017-08-11
HANGZHOU CHENGJIE ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the published literature, most of the research on catalysts in heterogeneous catalytic ozonation is based on Lewis acidic site catalysts, such as transition metal oxides CuO, MnO 2 、TiO 2 , Fe 2 o 3 etc., there is no report on catalytic ozonation with Lewis basic site catalyst CaO

Method used

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  • Application of CaO/AC solid catalyst in catalysis of acetic acid in ozone oxidation wastewater
  • Application of CaO/AC solid catalyst in catalysis of acetic acid in ozone oxidation wastewater
  • Application of CaO/AC solid catalyst in catalysis of acetic acid in ozone oxidation wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation of embodiment 1CaO / AC solid catalyst

[0027] Add 4g of activated carbon into 10mL of calcium nitrate solution with a mass fraction of 15%, shake and impregnate for 2h, vacuum-dry the impregnated material at 110°C, place it in a tube furnace, and calcinate it at 550°C for 4h under a nitrogen atmosphere to obtain CaO / AC solid catalyst.

[0028] The X-ray diffraction pattern of the prepared CaO / AC solid catalyst is as follows figure 2 shown by figure 2 It can be seen that CaO is loaded on the AC support.

Embodiment 2

[0029] The preparation of embodiment 2CaO / AC solid catalyst

[0030] Add 4g of activated carbon into 10mL of calcium nitrate solution with a mass fraction of 20%, oscillate and impregnate for 2h, dry the impregnated product in vacuum at 110°C, place it in a tube furnace, and calcinate at 600°C for 4h under a nitrogen atmosphere to obtain CaO / AC solid catalyst.

[0031] In the following examples, the CaO / AC solid catalyst prepared in Example 1 was used to catalyze ozonation to degrade acetic acid simulated wastewater. The concentration of acetic acid in the acetic acid simulated wastewater was 200 mg / L, and the volume of acetic acid simulated wastewater treated each time was 500 mL. The reaction apparatus used is as figure 1 shown.

[0032] Acetic acid simulates the pH of wastewater using NaOH solution and HNO 3 The solution is adjusted.

[0033] Ozone was continuously introduced into the simulated acetic acid wastewater in the form of ozone-containing air.

[0034] The d...

Embodiment 3～6

[0035] Embodiment 3~6CaO / AC solid catalyst catalyzes ozone oxidation acetic acid

[0036] Adjust the pH of the acetic acid simulated wastewater to 3.0, 5.0, 7.0 and 9.0 respectively, and add the CaO / AC solid catalyst prepared in Example 1 to the acetic acid simulated wastewater. Based on the volume of the acetic acid simulated wastewater, the dosage of the catalyst is 6g / L, the dosage of ozone was 59.03mg / L, after 60 minutes of reaction, samples were taken to detect the concentration of acetic acid in the simulated acetic acid wastewater. The results are shown in Table 1.

[0037] Table 1

[0038]

[0039]It can be seen from Table 1 that the pH of acetic acid simulated wastewater has an important influence on the degradation effect of acetic acid. When the pH is 7 or 9, the degradation effect of acetic acid is remarkable. When the pH is 7, the removal rate of acetic acid reaches 89.4%. When it is 9, the removal rate of acetic acid reaches 91.3%.

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Abstract

The invention discloses an application of a CaO / AC solid catalyst in catalysis of an acetic acid in ozone oxidation wastewater. The CaO / AC solid catalyst is fed to the wastewater containing the acetic acid, and ozone is introduced for catalytic oxidation; according to the CaO / AC solid catalyst, AC is taken as a carrier and CaO is taken as an active component. According to the CaO / AC solid catalyst, the AC is taken as the carrier, the CaO is taken as the active component, a terminal oxygen atom of ozone is bonded with hydroxyl on the surface of the CaO / AC solid catalyst and a lewis base center, and the generated active oxygen is capable of effectively oxidatively degrading the acetic acid in the wastewater.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to the application of a CaO / AC solid catalyst to catalyze ozone oxidation of acetic acid in wastewater. Background technique [0002] In recent years, the problem of industrial wastewater pollution caused by the rapid development of industrialization has become increasingly serious. For the problem of how to deal with wastewater, there are biochemical treatment, biological treatment and other methods. However, industrial wastewater has the characteristics of complex composition, high stability, difficult to be biodegraded, and toxic and harmful. Traditional water treatment methods are difficult to treat. [0003] With the continuous application of ozone oxidation technology in the water treatment process, we have gradually realized that ozone oxidation technology has the advantages of high efficiency and no secondary pollution. When ozone is used to treat refractory organic matt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/78B01J23/02C02F101/34
CPCC02F1/725B01J23/02C02F1/78C02F2101/34
Inventor 童少平杨彬洪夏萍项丰云朱显跃
Owner HANGZHOU CHENGJIE ENVIRONMENTAL PROTECTION
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