Combined degradation treatment method of high-concentration high-polymerization-degree polyvinyl alcohol wastewater

Abstract

The invention provides a combined degradation treatment method of high-concentration high-polymerization-degree polyvinyl alcohol wastewater. According to the combined degradation method, a pre-oxidation-catalytic oxidation two-stage oxidation method is combined, firstly, the polymerization degree of polyvinyl alcohol in the wastewater is reduced to 200 or below through a pre-oxidation stage, andthen the polyvinyl alcohol with ultralow polymerization degree and high concentration in the wastewater is further subjected to catalytic oxidation degradation, so that the optimal degradation treatment effect is achieved. The combined degradation treatment method is mainly used for carrying out degradation treatment on wastewater with the polymerization degree of at least 500, the concentration of 10-45wt.% and completely dissolved polyvinyl alcohol, the COD value of the wastewater is reduced to be below 100mg / L in a short time, and the COD value removal rate is as high as 99.95%; and the combined degradation treatment method is relatively low in cost and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of polyvinyl alcohol wastewater degradation treatment, in particular to a combined degradation treatment method for polyvinyl alcohol wastewater with high concentration and high polymerization degree, especially for high concentration and high polymerization degree in nuclear power industry, paper industry, textile and printing and dyeing desizing industry Degradation of polyvinyl alcohol wastewater. Background technique [0002] Polyvinyl alcohol (PVA) is a water-soluble polymer with a wide range of uses, and has been used as one of the three major sizing materials for warp yarn sizing. It has the advantages of stable slurry viscosity, good size film strength, abrasion resistance and buckling strength, and has excellent adhesion to various fibers or blended fibers. It has been widely used in chemical industry, textile industry and printing and dyeing industry. However, PVA is a slurry with poor biochemica...

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Problems solved by technology

[0004] The relevant literature reports about the treatment of polyvinyl alcohol wastewater disclosed at present, such as the invention patent with the publication number CN108503010A discloses a treatment method for wastewater containing polyvinyl alcohol, which is mainly by adding polyvinyl alcohol with a molar ratio of 1:2 Fe 2+ and Fe 3+ , after stirring evenly, adjust the pH to alkaline to precipitate iron sludge, and then separate the solid and liquid. Although this method is simple to operate and the process is simple, it will eventually produce a large amount of iron sludge, and it is only suitable for the treatment of low-concentration polyvinyl alcohol wastewater , unable to handle PVA with a concentration above 3000mg / L

The invention patent with the publication number CN 102757144 A discloses a photo / electrical Fenton treatment process for polyvinyl alcohol desizing wastewater. This process combines Fenton oxidation with ultraviolet light to improve the oxidation efficiency of Fenton reagent, and then further makes PVA is oxidatively degraded and finally treated with a biochemical pool. This method introduces light / electricity to make the degradation efficiency of PVA higher than that of traditional Fenton oxidation, which relatively saves the cost of reagents, but still requires a large amount of reagents to adjust the pH to alkaline, and there is iron sludge problem. , and the cost of long-term operation of electricity / light is also high, it is difficult to achieve real industrialization

The invention patent with the publication number CN106311125A discloses the application of a manganese oxide / alumina composite material in the treatment of polyvinyl alcohol. x o y / γAl 2 0 3 The composite material performs adsorption treatment or catalytic degradation treatment of polyvinyl alcohol aqueous solution, and simultaneously realizes the adsorption treatment and catalytic degradation treatment of polyvinyl alcohol. However, this method is an adsorption catalytic reaction, and the use of the catalyst needs to be continuously regenerated, which is harmful to equipment and operators. High requirements, high cost, difficult to achieve industrial production promotion

The invention patent with the publication number CN105540818A discloses a treatment method for catalytic oxidation of polyvinyl alcohol wastewater by hydrogen peroxide. The method degrades polyvinyl alcohol wastewater under stirring conditions by adding hydrogen peroxide and a catalyst under acidic conditions, thereby achieving The treatment of polyvinyl alcohol wastewater; the treatment process is carried out under normal pressure, the reaction temperature is 50-80 ° C, the reaction conditions are mild, the removal rate of COD in the wastewater is over 90%, most of the polyvinyl alcohol can be removed, but the The method can't handle the high-concentration polyvinyl alcohol wastewater with COD above 5000-10000ppm formed by polyvinyl alcohol well

[0005] Therefore, it can be considered that the current prior art generally can only handle low-concentration polyvinyl alcohol wastewater, and there is no suitable treatment method for high-concentration and high-polymerization polyvinyl alcohol wastewater. It is aimed at nuclear power industry, paper industry, textile and printing and dyeing. The high-concentration and high-polymerization polyvinyl alcohol wastewater produced in the desizing industry lacks a low-cost and efficient treatment process

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