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Purification method of printing and dyeing waste alkaline liquor

A technology for waste lye and clear liquid, which is applied in chemical instruments and methods, textile industry wastewater treatment, water/sewage multi-stage treatment, etc. To achieve the effect of reducing the degree of membrane fouling and improving the efficiency and effect

Inactive Publication Date: 2019-04-12
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has huge equipment, large floor space, low evaporation efficiency, large power consumption and high energy consumption, and cannot effectively remove organic pollutants such as additives and impurities in the waste liquid, so it is difficult to recover the waste alkali concentrate Reusing it again in the fabric treatment process cannot really achieve the resource disposal of printing and dyeing waste lye

Method used

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  • Purification method of printing and dyeing waste alkaline liquor
  • Purification method of printing and dyeing waste alkaline liquor
  • Purification method of printing and dyeing waste alkaline liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Calcium Oxide Precipitation

[0037] Take 1L of waste printing and dyeing lye from the factory, add 20g / L calcium oxide, stir at room temperature, stirring speed 300rpm, stirring time 30min, then let it stand overnight, filter out the precipitate, and obtain the first clear liquid.

[0038] (2) polyaluminum chloride flocculation

[0039] At 25°C, take the first clear liquid, add 5g / L polyaluminum chloride, first stir at 200rpm for 1.5min, then stir at 80rpm for 20min, and finally let it settle for 30min to obtain the second clear liquid.

[0040] (3) Ultrafiltration membrane separation

[0041] Using the second clear liquid as the material liquid, it is separated by ultrafiltration membrane, and the PES ultrafiltration membrane with a molecular weight cut off of 1000 is used as the filtration membrane. The effective diameter of the diaphragm is 4.5cm, and the effective membrane area is 1.59×10 -3 m 2 . During the ultrafiltration membrane separation process, the ...

Embodiment 2

[0048] (1) Magnesium oxide precipitation

[0049] Take 1L of waste printing and dyeing lye from the factory, add 14g / L magnesium oxide, stir at room temperature, stirring speed 300rpm, stirring time 30min, then let it stand overnight, filter out the precipitate, and obtain the first clear liquid.

[0050] (2) polyaluminum chloride flocculation

[0051] At 25°C, take the first clear liquid, add 5g / L polyaluminum chloride, first stir at 200rpm for 1.5min, then stir at 80rpm for 20min, and finally let it settle for 30min to obtain the second clear liquid.

[0052] (3) Ultrafiltration membrane separation

[0053] Using the second clear liquid as the material liquid, it is separated by ultrafiltration membrane, and the PES ultrafiltration membrane with a molecular weight cut off of 1000 is used as the filtration membrane. The effective diameter of the diaphragm is 4.5cm, and the effective membrane area is 1.59×10 -3 m 2 . During the ultrafiltration membrane separation process, ...

Embodiment 3

[0060] (1) Calcium Oxide Precipitation

[0061] Take 1L of waste printing and dyeing lye from the factory, add 20g / L calcium oxide, stir at room temperature, stirring speed 300rpm, stirring time 30min, then let it stand overnight, filter out the precipitate, and obtain the first clear liquid.

[0062] (2) Sodium styrene sulfonate flocculation

[0063] At 40°C, take the first clear liquid, add 20 mg / L sodium p-styrene sulfonate, stir at 300 rpm for 5 min, and then let it settle for 30 min to obtain the second clear liquid.

[0064] (3) Ultrafiltration membrane separation

[0065] Using the second clear liquid as the material liquid, it is separated by ultrafiltration membrane, and the PES ultrafiltration membrane with a molecular weight cut off of 1000 is used as the filtration membrane. The effective diameter of the diaphragm is 4.5cm, and the effective membrane area is 1.59×10 -3 m 2 . During the ultrafiltration membrane separation process, the temperature of the material...

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Abstract

The invention provides a purification method of printing and dyeing waste alkaline liquor. The method comprises the steps of a, mixing the printing and dyeing waste alkaline liquor and alkaline earthmetal oxide for a reaction, and conducting settling to obtain first clear liquor; b, mixing the first clear liquor and a flocculating agent for a reaction, and conducting settling to obtain second clear liquor, wherein the flocculating agent comprises polyaluminum chloride and / or sodium p-styrene sulfonate; c, conducting ultrafiltration on the second clear liquor to obtain third clear liquor; d, conducting nanofiltration on the third liquor to obtain purified alkaline liquor. According to the purification method, aiming at the features of the printing and dyeing waste alkaline liquor, impurityions, suspended matter and particulate matter in the printing and dyeing waste alkaline liquor are removed through settling-coagulating-ultrafiltration-nanofiltration methods, particularly, in the coagulating stage, the flocculating agent is subjected to optimization selection, the effect of removing the impurity ions, COD, turbidity and chromaticity in the waste liquor is greatly improved, the membrane pollution degree during subsequent membrane separation (ultrafiltration and nanofiltration) is alleviated, the membrane efficiency efficiency and effect are improved, and the purified alkalineliquor meeting the recycling requirement is obtained.

Description

technical field [0001] The invention belongs to the field of environmental protection, in particular to a method for purifying waste lye from printing and dyeing. Background technique [0002] The largest chemical used in the textile industry is sodium hydroxide. Therefore, the printing and dyeing waste lye produced by the printing and dyeing factory contains a large amount of OH - . In addition, because the fabric needs to undergo pretreatments such as sizing, desizing, scouring, and bleaching, there are also many chemical auxiliaries (penetrants, hydrosulfites, oxidizers, sizing, etc.) remaining in the pretreatment process in the printing and dyeing waste lye . [0003] Because the printing and dyeing waste lye contains a large amount of OH - and other pollutants, so if it is discharged directly, it will not only cause great pollution to the environment, but also cause a waste of alkali resources. However, if it is directly used in fabric treatment, on the one hand, b...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/30
CPCC02F1/442C02F1/444C02F1/5245C02F1/58C02F9/00C02F2103/30
Inventor 房宽峻韩双刘秀明安芳芳杨海贞曲鸽
Owner TIANJIN POLYTECHNIC UNIV
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