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Synchronous decoloration and nitrogen recovery method for high-concentration printing waste liquids

A recovery method and high-concentration technology, applied in the field of textile printing and dyeing industry, can solve the problems of not being able to remove ammonia nitrogen at the same time, easily forming brackish water, secondary pollution, etc., and achieve the effects of preventing secondary pollution, reducing solubility, and saving water

Inactive Publication Date: 2016-04-13
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coagulation method and acid precipitation method can only remove water-soluble resins, pigments and other organic substances in the waste liquid, but cannot remove the ammonia nitrogen in the waste liquid at the same time, and usually need to be removed by other chemical or biological methods
Especially the acid analysis method directly adds inorganic acid to the waste liquid, which increases the content of acid radical ions in the waste water, causes secondary pollution, and easily forms brackish water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Add hydrogen type strong acid type cation exchange resin to high concentration black printing waste liquid (COD Cr : 378200mg / L; Chromaticity: 35,000 times; Ammonia nitrogen: 3010mg / L), stirring and reacting for 60 minutes until the waste liquid reacts into a paste sludge; use the treated waste water as backwash water to wash the resin; wash the backwash water The sludge sedimentation is separated from the wastewater, and the sedimentation sludge is dewatered by mechanical pressure filtration; the rinsed cation exchange resin is filtered and dehydrated; the dehydration resin is treated with an acid solution with a mass concentration of 10% to form [R 3 NH] + Cl - Nitrogen is recovered and the resin is regenerated at the same time; the regenerated cation exchange resin is added to the high-concentration printing waste liquid for recycling.

[0014] Adopt the method of the present invention to process, and the decolorization rate of this kind of printing waste liquid is...

Embodiment 2

[0016] The sodium-type strong-acid cation exchange resin is pretreated and replaced with a hydrochloric acid solution with a mass concentration of 10%, and then added to the high-concentration black printing waste liquid (COD Cr : 378200mg / L; Chromaticity: 35,000 times; Ammonia nitrogen: 3010mg / L), stirring and reacting for 60min, until the waste liquid reacts into a paste sludge; use the treated waste water as backwash water to wash the resin; The sludge in the water is separated from the wastewater, and the precipitated sludge is dewatered by mechanical pressure filtration; the rinsed cation exchange resin is filtered and dehydrated; the dehydration resin is treated with a hydrochloric acid solution with a mass concentration of 10% to form [R 3 NH] + Cl - Nitrogen is recovered and the resin is regenerated at the same time; the regenerated cation exchange resin is added to the high-concentration printing waste liquid for recycling.

[0017] Adopt the method of the present i...

Embodiment 3

[0019] Add hydrogen type strong acid type cation exchange resin to high concentration blue printing waste liquid (COD Cr : 305000mg / L; Chromaticity: 30,000 times; Ammonia nitrogen: 2750mg / L), stirring and reacting for 60 minutes, until the waste liquid reacts into a paste sludge; use the treated waste water as backwash water to wash the resin; The sludge in the water is separated from the wastewater, and the precipitated sludge is dewatered by mechanical pressure filtration; the rinsed cation exchange resin is filtered and dehydrated; the dehydration resin is treated with a hydrochloric acid solution with a mass concentration of 10% to form [R 3 NH] + Cl - Nitrogen is recovered and the resin is regenerated at the same time; the regenerated cation exchange resin is added to the high-concentration printing waste liquid for recycling.

[0020] Adopt the method of the present invention to process, the decolorization rate of this kind of printing waste liquid is up to 99.8%, the ...

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Abstract

The invention discloses a synchronous decoloration and nitrogen recovery method for high-concentration printing waste liquids. The method is characterized by comprising steps as follows: cation exchange resin is added to a certain quantity of the high-concentration printing waste liquids and stirred until pasty sludge is formed through a reaction; treated wastewater is taken as back washing water to wash the resin clean; the sludge in the back washing water is precipitated and separated from wastewater, the precipitated sludge is mechanically pressed and dewatered; the washed cation exchange resin is filtered and dewatered; an acid solution for dewatered resin is treated, nitrogen is recovered, and the resin is regenerated; the regenerated cation exchange resin is added to the high-concentration printing waste liquids and recycled. With the adoption of the treatment method, the decolorization rate of the printing waste liquids is higher than 99.5%, the ammonium-nitrogen removal rate is about 90%, the CODCr removal rate is higher than 90%, synchronous decoloration and nitrogen recovery of the waste liquids are realized, and the content of acid group ions in the wastewater is not increased.

Description

technical field [0001] The invention belongs to the technical field of textile printing and dyeing industry, in particular to a method for synchronous decolorization and nitrogen recovery of high-concentration printing waste liquid. Background technique [0002] Ink is composed of pigments, binders, fillers, additives, etc., and can be divided into oil-based inks and water-based inks. Oil-based ink contains a large amount of organic solvents, causing serious pollution and will be gradually eliminated. Water-based ink is mainly composed of water-soluble resin, pigment, alcohol, amine or ammonia and other additives and water. Water-based ink is widely used in various fields because of its health, environmental protection and safety characteristics. At present, a large number of plastic packaging (waterproof) materials are increasingly using water-based inks when printing. When changing colors, it is necessary to clean the printing equipment and water-based ink storage tanks,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/42B01J39/20B01J49/00C02F103/30C02F101/16
CPCC02F1/42B01J39/20B01J49/00C02F2101/16C02F2103/30
Inventor 柳荣展张宾潘颖邹译慧于梦楠于潘芬于晓王宇琦张尚一
Owner QINGDAO UNIV
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