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Method for treating polyvinyl alcohol waste water by catalytic oxidizing process

A technology of catalytic oxidation and polyvinyl alcohol, applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of difficult operation, high cost, complicated process, etc., and achieve fast reaction speed, The effect of low cost and high efficiency

Inactive Publication Date: 2007-04-11
刘德沛
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Problems solved by technology

[0003] At present, the physical and chemical concentration ultrafiltration method is mainly used at home and abroad to recycle polyvinyl alcohol bleaching wastewater. However, this wastewater treatment method has high costs and is limited to wastewater with high polyvinyl alcohol concentration; Alcohol pure strains are inoculated, but the process is complex, difficult to operate, and difficult to popularize and apply

Method used

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Embodiment Construction

[0018] A kind of method of catalytic oxidation process treatment polyvinyl alcohol waste water of the present invention, it adopts Fenton's reagent method, promptly homogeneous catalytic oxidation method, polyvinyl alcohol (Polyvinyl alcohol, PVA) in industrial waste water is processed, and this method comprises the following steps :

[0019] (1) Determination of COD in wastewater that needs to be treated cr

[0020] (2), press H 2 o 2 / COD Cr (g / g) (specific gravity ratio) to add Fenton's reagent in wastewater, ie Fe 2+ solution and H 2 o 2 .

[0021] The H 2 o 2 / COD Cr (g / g) (specific gravity ratio) is 1.25-2.25.

[0022] In step 1, the polyvinyl alcohol industrial wastewater is pretreated, that is, the pH value of the polyvinyl alcohol is adjusted. In this embodiment, the pH value of the polyvinyl alcohol is 5.0.

[0023] Catalytic oxidation treatment using Fenton reagent is to add Fe to wastewater 2+ solution and H 2 o 2 Fe in it 2+ Solution is FeSO 4 sol...

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Abstract

The present invention is catalytic oxidation process for treating PVA waste water. The process includes the following steps: pre-treating waste water from PVA industry and subsequent catalytic oxidation with Fenton reagent through throwing FeSO4 solution and H2O2 in the weight ratio of 18-22 to 1. The process can eliminate 85.1 % of CODCr in PVA waste water and make PVA waste water reach draining standard. The oxidation reaction may be completed at normal temperature in high speed, and the Fenton reagent is environment friendly.

Description

technical field [0001] The invention relates to a method for treating polyvinyl alcohol wastewater by a catalytic oxidation process. Background technique [0002] Polyvinyl alcohol (PVA) is an important chemical raw material in the textile industry, and it is a polymer substance that is difficult to biodegrade. In the printing and dyeing process, the desizing process is mainly to remove the size added to the light yarn during the weaving process, so that there is a better affinity between the fabric fiber and the dye. Since PVA is often used for sizing cotton blended fabrics, the desizing wastewater contains A large amount of PVA, due to the high content of organic matter in PVA wastewater, its COD cr The content reaches 3000-4000mg / L, and it is difficult to degrade by traditional physicochemical and biochemical methods. [0003] At present, the physical and chemical concentration ultrafiltration method is mainly used at home and abroad to recycle polyvinyl alcohol bleachi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/58
Inventor 刘德沛
Owner 刘德沛
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