Catalytic ozonation-based pretreatment method for acid wastewater containing water-soluble polymer hard to degrade

Abstract

The invention relates to a catalytic ozonation-based pretreatment method for acid wastewater containing water-soluble polymer hard to degrade, and belongs to the technical field of wastewater treatment. According to the method, firstly, an activated aluminum oxide loaded copper manganese oxide catalyst is prepared, wherein the load rate of copper manganese oxide on activated aluminum oxide particle carriers is 3-5wt. %, and the molar ratio of the copper component to the manganese component is 1:(1-3); then the catalyst is added to to-be-treated wastewater with a pH range of 3-5.5, then an additive hydrogen peroxide solution is added into the wastewater, ozone is introduced and aeration is performed under the condition of room temperature, and then magnetic stirring is performed at a rotation speed of 120-200 rpm, thereby realizing catalytic ozonation-based pretreatment of the acid wastewater containing the water-soluble polymer hard to degrade. The pretreatment method is a novel advanced oxidation technology, is easy to operate, and solves the problem that water-soluble polymer pollutants in the wastewater with relatively low pH are not easy to oxidize and degrade (catalytic ozonation method); and long chains of pollutant molecules are broken, thus being conducive to subsequent biological treatment or membrane treatment.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for pretreatment of acidic wastewater containing refractory water-soluble polymers based on catalytic ozonation. changes in molecular weight distribution. Background technique [0002] At present, my country is still a country seriously short of water. In view of the current situation of water shortage, sewage purification has become an important countermeasure. With the increasing application of water-soluble polymer compounds in industry, such substances (such as polyvinyl alcohol (PVA), etc.) often exist in many types of industrial wastewater. Moreover, wastewater containing such substances, such as textile printing and dyeing, has an extreme pH (such as strong acidity). In addition, the characteristics of being difficult to be degraded by microorganisms and easily clogging the filter membrane make direct biological treatment or membrane tre...

AI Technical Summary

Problems solved by technology

According to relevant literature and engineering examples at home and abroad, the current treatment method for acidic wastewater is the Fenton method, but it often causes secondary pollution due to the generation of iron sludge during the reaction process; the treatment method for water-soluble polymer wastewater has adsorption method, foam separation method, membrane treatment method, coagulation and flocculation and other methods. Although these methods can effectively separate pollutants, they have not achieved the degradation of pollutants. In addition, these methods have relatively strict requirements on treatment conditions. , the cost is relatively high

[0003] As an important branch of the advanced oxidation method, the catalytic ozonation technology has been widely used in recent years due to its advantages of high treatment efficiency and no residue in the reaction. Sewage treatment, however, the low treatment efficiency of this technology in acidic environment is an important factor limiting its application

Hydrogen peroxide is widely used in the field of water treatment as a commonly used oxidizing agent and additive, such as photocatalysis and Fenton systems, but the progress of these reaction systems is often accompanied by a large amount of hydrogen peroxide, resulting in waste of resources

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