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Method for removing formaldehyde in wastewater by catalytic oxidation

A catalytic oxidation and waste water technology, which is applied in the removal of formaldehyde in waste water, and the field of formaldehyde removal in waste water through catalytic oxidation reaction, can solve the problems of easy failure of catalyst, consumption of manpower and material resources, large oxygen consumption, etc., and achieve good industrial application prospects, Avoid prone to failure, environmentally friendly effect

Pending Publication Date: 2021-11-23
TAIYUAN INST OF TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the physical method mainly uses porous particles as an adsorbent to adsorb and enrich formaldehyde. In wastewater, the adsorbent can easily reach adsorption saturation and become invalid. It is difficult to recycle and reuse the adsorbent, and formaldehyde has not been fundamentally degraded.
The chemical method mainly converts formaldehyde into other non-toxic or low-toxic substances through oxidation reaction, so as to achieve the purpose of removing formaldehyde. The oxidation method currently used has the disadvantages of large oxygen consumption, difficult recovery of catalyst or easy failure of catalyst.
The biochemical method uses microorganisms with strong metabolism. This method has high efficiency and will not cause secondary pollution, but microorganisms are sensitive to temperature and pH of the wastewater environment. Therefore, it is necessary to cultivate and reproduce specific microorganisms for formaldehyde wastewater in different chemical environments. species, consume a lot of manpower and material resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add waste water with a formaldehyde concentration of 1000mg / L to a 100mL three-necked flask, and then add Fe 2 o 3 And concentration is the hydrogen peroxide solution of 30wt%, to Fe in the above-mentioned waste water 2 o 3 The final concentration of hydrogen peroxide was 1.2wt%, and the final concentration of hydrogen peroxide was 0.8wt%. The reaction was stirred and reacted at 45°C for 60min, and then analyzed by liquid chromatography. The conversion rate of formaldehyde was measured to be 46.5%.

Embodiment 2

[0017] Add waste water with a formaldehyde concentration of 1000mg / L into a 100mL three-neck flask, and then add Co 2 o 3 and concentration of 30wt% hydrogen peroxide solution, to the above wastewater Co 2 o 3 The final concentration of hydrogen peroxide was 1.2wt%, and the final concentration of hydrogen peroxide was 0.8wt%. The reaction was stirred and reacted at 45°C for 60min, and then analyzed by liquid chromatography, and the conversion rate of formaldehyde was measured to be 36.7%.

Embodiment 3

[0019] In the 100mL there-necked flask, add formaldehyde concentration to be the waste water of 1000mg / L, then add NiO and concentration successively and be the hydrogen peroxide solution of 30wt%, be 1.2wt% to the final concentration of NiO in the above-mentioned waste water, the final concentration of hydrogen peroxide is 0.8wt%, stirred and reacted at 45°C for 60min, and then analyzed by liquid chromatography, the conversion rate of formaldehyde was measured to be 62.1%.

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Abstract

The invention relates to a method for removing formaldehyde in wastewater by catalytic oxidation, and belongs to the technical field of wastewater treatment. Formaldehyde as a raw material, a transition metal oxide as a catalyst and a hydrogen peroxide solution as an oxidizing reagent are stirred and reacted for 15-60 minutes at 25-45 DEG C, and formaldehyde is catalytically oxidized into carbon dioxide and water, wherein the transition metal oxide is selected from any one of Fe2O3, Co2O3, NiO, CuO and ZnO. According to the method, formaldehyde in the wastewater can be effectively removed, the catalyst is easy to recover and can be repeatedly used, excessive hydrogen peroxide can be decomposed into water and oxygen, and the method is environmentally friendly, safe and non-toxic.

Description

technical field [0001] The invention relates to a method for removing formaldehyde in waste water, in particular to a method for removing formaldehyde in waste water through a catalytic oxidation reaction, and belongs to the technical field of waste water treatment. Background technique [0002] Formaldehyde is an important industrial raw material, which is widely used in medicine, cotton textile industry, chemical industry, etc. A large amount of waste gas and waste liquid are emitted during the production of related products, resulting in a serious decline in air quality and pollution of water resources. It affects human health and pollutes the environment. Formaldehyde has strong biological toxicity and has been identified as a carcinogenic and teratogenic substance by the World Health Organization. If the human body is exposed to high-concentration formaldehyde in the air for a long time, symptoms such as dizziness, nausea, decreased immune function, memory loss, and los...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F101/34
CPCC02F1/725C02F1/722C02F2101/34C02F2209/02C02F2209/44C02F2305/026
Inventor 马庆国牛宇岚薛彦峰郝钰
Owner TAIYUAN INST OF TECH
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