Dyeing waste-water decolorizing degradation, recovery and utilization

A dyeing wastewater and decolorization technology, applied in chemical instruments and methods, textile industry wastewater treatment, adsorption water/sewage treatment, etc. Union, etc.

Inactive Publication Date: 2006-05-31
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of them mentioned light-assisted technology, nor did they effectively combine wastewater filtration process, activated carbon adsorption purification process and iron removal process, nor did they involve the reuse of treated dyeing wastewater for textile dyeing processing

Method used

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  • Dyeing waste-water decolorizing degradation, recovery and utilization
  • Dyeing waste-water decolorizing degradation, recovery and utilization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (Oxidation method) The target wastewater is the wastewater discharged from the processes of cotton fabric dyeing, soaping and washing.

[0030] Step 1: The dyeing wastewater is treated by a filtration process. The filter unit is mainly composed of a porcelain funnel (with 7# qualitative ordinary filter paper included), a glass collection bottle and a suction filter device. The middle is connected by a silicone tube and a rubber stopper. The filtration rate is controlled at about 0.25 liters / minute to obtain filtered wastewater.

[0031] Step 2: use the photochemical reaction decolorization degradation process to filter the wastewater for treatment. Firstly, dilute sulfuric acid is used to adjust the pH value of filtered waste water, and then the photocatalytic oxidant is prepared according to the ratio of iron sulfate, oxalic acid and hydrogen peroxide in a molar ratio of 1:3:5. The decolorization process is as follows: add 0.50ml of photocatalytic oxidant to 100ml of ...

Embodiment 2

[0041] Step 1: Filtration speed is controlled at about 0.5 liter / minute, the rest is the same as in Example 1.

[0042] Step 2: use the photochemical reaction decolorization degradation process to filter the wastewater for treatment. Firstly, dilute sulfuric acid is used to adjust the pH value of filtered waste water, and then the photocatalytic oxidant is prepared according to the ratio of iron sulfate, oxalic acid and hydrogen peroxide in a molar ratio of 1:3:5. The decolorization process is as follows: add 2.50ml of photocatalytic oxidant to 100ml of dyed wastewater into the filtered wastewater, stir it evenly and place it in a water-cooled temperature-controlled photochemical reactor (patent No. ZL03275610.0), at a temperature of 21°C React with pH about 2.0 for about 15 minutes to obtain decolorized wastewater. The reuse results are shown in Table 5, Table 6 and Table 7.

[0043]

color properties

surface depth

total color difference

S...

Embodiment 3

[0051] Step 1: Filtration speed is controlled at about 0.2 liters / minute, and the remainder is the same as in Example 1.

[0052] Step 2: use the photochemical reaction decolorization degradation process to filter the wastewater for treatment. Firstly, dilute sulfuric acid is used to adjust the pH value of filtered waste water, and then the photocatalytic oxidant is prepared according to the ratio of iron sulfate, oxalic acid and hydrogen peroxide in a molar ratio of 1:3:5. The decolorization process is as follows: Add 5.0ml of photocatalytic oxidant to 100ml of dyed wastewater to filter wastewater, stir evenly, and place it in a water-cooled temperature-controlled photochemical reactor (patent No. ZL03275610.0), at a temperature of 22°C React with pH about 5.0 for about 10 minutes to obtain decolorized wastewater. The reuse results are shown in Table 8, Table 9 and Table 10.

[0053]

color properties

surface depth

total color difference

S...

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Abstract

A dyeing waste water decolorizing degradation and reuse method is carried out by light-auxiliary oxidizing based on ferric oxalate / hydrogen peroxide system or light-auxiliary reducing based on hydroboron / sulfate by water-cooled temperature-controlled light chemical reactor, light chemical decolorizing degradation treating for filtered waste water, and passing degradated wasted water by active carbon adsorptive layer with thickness 80-100cm and flowing-speed 10-30ml / min.The active carbon is particular industrial waste water active carbon with size 3-5mm and density 0.45-0.50g / cm3, iodine adsorptive value is 850mg / g. It can be used for cotton fabrics.

Description

technical field [0001] The invention relates to a dyeing wastewater treatment technology, specifically a method for decolorization, degradation and reuse of dyed wastewater produced by dyeing cotton textiles with azo reactive dyes. The international patent classification number is intended to be Int.Cl 7 C02F 1 / 52. Background technique [0002] The textile industry is one of the departments that discharge a large amount of industrial wastewater in my country. According to incomplete statistics, the annual wastewater discharge is as high as 900 million tons, ranking sixth in my country's industrial wastewater discharge, of which printing and dyeing wastewater discharge accounts for 80% of emissions. Therefore, the environmental pollution problem of the textile industry is mainly the pollution of printing and dyeing wastewater. At the same time, the textile printing and dyeing industry is a large water user, which consumes a lot of water resources. It consumes 100-200 tons o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/28C02F1/30C02F1/70C02F1/72C02F103/30
Inventor 董永春刘春燕何陆春李春辉
Owner TIANJIN POLYTECHNIC UNIV
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