Method for degrading formaldehyde pollutant with catalyzing wet oxidation process

Abstract

The invention provides a method for degrading high-concentration formaldehyde pollutant with a catalyzing wet oxidation process by adopting metal-metal oxide as a catalyst. The formaldehyde pollutant water solution with the mass concentration of 100 to 10000 mg / L is arranged into a high-pressure reactor, metal-metal oxide compound catalyst is added into the reactor, oxygen or air is used as an oxidant, the formaldehyde pollutant is removed through the oxidation reaction, the reaction temperature is 60 to 200 DEG C, the reaction pressure is 0.5 to 3MPa, pH value of the reaction solution is 2 to 10, and the reaction time is 0.5 to 8 hours. The reaction condition by adopting the method to process the formaldehyde waste water is moderate, the cost is low, the removal rate of total organic carbon of formaldehyde containing the formaldehyde reaches more than 90 percent, secondary pollution does not exist, and the method is applicable to the degradation of the formaldehyde pollutant in the industrial waste water and has promising industrialized application prospect.

Description

【Technical field】 [0001] The invention relates to the treatment of high-concentration formaldehyde pollutants, in particular to a method for catalytic wet oxidation degradation of formaldehyde pollutants. 【Background technique】 [0002] Formaldehyde (HCHO) is a protoplasmic poison that destroys the protein of biological cells. It can cause damage to human skin, respiratory tract and internal organs, anesthetize the central nervous system, and cause pulmonary edema, hepatic coma, and kidney failure. The World Health Organization has confirmed that formaldehyde is a teratogenic and carcinogenic substance, and long-term exposure can cause gene mutations. Wastewater containing formaldehyde comes from a wide range of sources, including chemical, organic synthesis, pharmaceutical, paint, coating, plastic, textile, military, and wood adhesive industries. Among them, the discharge concentration of formaldehyde-containing wastewater from wood treatment enterprises such as formalin s...

AI Technical Summary

Problems solved by technology

But the reaction system uses Ag / CeO 2 The cost of the catalyst is very high, and the reaction temperature is very high, which further increases the processing cost, which is obviously not conducive to industrial application

In their paper in 2008, Han et al. disclosed that nano-gold was loaded on hydroxyapatite, and under the action of hydrogen peroxide, the wet catalytic peroxidation of formaldehyde solution was realized under low pH value and mild conditions of 60°C. The advantage of this method is that The oxidation of organic matter is complete, but the disadvantage is that the cost of catalyst and hydrogen peroxide is high; in addition, Somjate Photong et al. use SiO 2 / TiO 2 The photodegradation of formaldehyde by film has achieved good results, but the reaction requires ultraviolet light, which is only suitable for laboratory or small batch sample processing, and cannot be applied industrially