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Clean production process for spinning by using advanced oxidation method to decompose polyvinyl alcohol pulp of fabric

A technology of advanced oxidation and polyvinyl alcohol, applied in the directions of oxidized water/sewage treatment, light water/sewage treatment, etc., can solve the problems of poor biodegradability of wastewater, and achieve complete oxidation of products, no secondary pollution, and no pollution to the environment. Effect

Inactive Publication Date: 2005-11-23
JIANGNAN UNIV
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AI Technical Summary

Problems solved by technology

The desizing wastewater whose sizing is mainly starch (such as cotton cloth) has high COD and BOD values ​​and has good biodegradability; the desizing wastewater whose sizing is mainly polyvinyl alcohol (PVA) (such as polyester-cotton warp yarn), The COD value is high but the BOD value is low, and the biodegradability of the wastewater is poor. It is difficult to achieve satisfactory results by using the traditional activated sludge process.

Method used

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  • Clean production process for spinning by using advanced oxidation method to decompose polyvinyl alcohol pulp of fabric
  • Clean production process for spinning by using advanced oxidation method to decompose polyvinyl alcohol pulp of fabric
  • Clean production process for spinning by using advanced oxidation method to decompose polyvinyl alcohol pulp of fabric

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preparation example Construction

[0029] 2. Preparation of laboratory sizing polyester-cotton fabric sample

[0030] Cut the unsized polyester-cotton fabric into 5×5cm 2 Then, soak in 20g / L PVA solution for 15min and bake at 105℃ for 30min. Repeat the operation 3 times.

[0031] 3. Preparation of sizing polyester-cotton fabric in desizing tank of textile mill and sampling of desizing wastewater

[0032] Cut the polyester-cotton fabric sizing in the desizing tank to 5×5cm 2 Then take 400ml of desizing wastewater from the desizing tank, then mix the two to continue desizing for 1 hour, and then enter the advanced oxidation reactor.

[0033] 4. Desizing operation parameters

[0034] The initial concentration of polyvinyl alcohol in the desizing wastewater is less than 2000mg / L. After the desizing wastewater is pumped into the advanced oxidation reactor, hydrogen peroxide is added dropwise to it so that the initial concentration of hydrogen peroxide is 100~1000mg / L, and the oxidation time is 2 to 3 hours.

Embodiment 1

[0036] Desizing treatment with a sample of sizing polyester / cotton fabric in the laboratory, and inspected UV+TiO 2 +H 2 O 2 Advanced oxidation reaction system removes the PVA effect on polyester-cotton fabrics. In the advanced oxidation reactor, H is added dropwise to the desizing wastewater 2 O 2 , Make H 2 O 2 The initial concentration is 100mg / L, and then put the ultraviolet lamp in the quartz tube coated with titanium dioxide layer, irradiate the desizing wastewater for oxidation treatment, and conduct parallel tests at different temperatures of 35℃, 60℃ and 70℃, and 80℃ The desizing wastewater without advanced oxidation treatment after desizing treatment was used as a control. The test results are shown in Figure 2 and Figure 3. After treatment, the final concentration of PVA in the desizing wastewater is close to zero, and the residual rate of PVA on the polyester-cotton fabric at 70°C is below 10%.

Embodiment 2

[0038]Take the medium-sized polyester-cotton fabric in the textile factory as a sample and mix the sampled desizing wastewater for desizing treatment, and inspect the UV+H 2 O 2 The advanced oxidation reaction system removes the PVA effect on polyester-cotton fabrics. In the advanced oxidation reactor, H is added dropwise to the desizing wastewater 2 O 2 , Make H 2 O 2 The initial concentration is 1000mg / L, and then put the ultraviolet lamp in the quartz tube, irradiate the desizing wastewater for oxidation treatment, and conduct the test at 70°C. In addition, use the desizing wastewater that has not undergone advanced oxidation treatment after desizing treatment at 80°C. Control, the test results are as Figure 4 , Figure 5 Shown. After treatment, the final concentration of PVA in the desizing wastewater is close to zero, and the residual rate of PVA on the polyester-cotton fabric is below 10% at 70°C.

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Abstract

Disclosed is a clean production process for spinning by using advanced oxidation method to decompose polyvinyl alcohol pulp of fabric, which integrates high grade oxidation reaction device with desizing trough, the desized waste water flows through the oxidization reactor, thus degrading the polyvinyl alcohols contained in the waste water into intermediate product, the treated waste water flows back into the desizing trough for recirculation or direct discharge. The high grade oxidation technique includes optical catalytic oxidation or non-homogeneous phase Fenton catalytic oxidation, wherein the optical catalytic oxidation includes UV+TiO2+H2O2, UV+H2O2 or UV+TiO2, the non-homogeneous phase catalytic oxidation includes Nafion film + H2O2.

Description

Technical field [0001] A textile clean production process for decomposing fabric polyvinyl alcohol slurry by an advanced oxidation method belongs to the technical field of textile clean production, and is specifically the oxidative degradation of polyvinyl alcohol. technical background [0002] Polyvinyl alcohol (PVA) is a synthetic water-soluble high-molecular polymer. Because of its excellent properties such as stable pH, miscibility and strong emulsification ability, it also has good adhesion to natural fibers and general synthetic fibers. Properties, film-forming properties and abrasion resistance are the main sizing agents in the warp sizing of polyester-cotton fabrics. The fabric sizing with PVA must undergo desizing treatment to increase its water absorption. The pretreatment stage of the printing and dyeing process includes five processes of singeing, desizing, smelting, bleaching, and mercerizing. Desizing wastewater, smelting wastewater, bleaching wastewater and merceri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72
Inventor 陈坚华兆哲杨伟坡堵国成
Owner JIANGNAN UNIV
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