Synchronous decoloring and nitrogen recovery method for printing wastewater

A technology of printing wastewater and recycling method, applied in the field of textile printing and dyeing industry, can solve the problems of secondary pollution, inability to reduce the ammonia nitrogen content of wastewater, etc.

Active Publication Date: 2016-06-15
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 wastewater, but cannot reduce the ammonia nitrogen content in the wastewater, and usually need to be removed by other chemical or biological methods
In particular, the acid analysis method directly adds inorganic acid to the wastewater, which increases the content of acid radical ions in the wastewater and causes secondary pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add hydrogen type strongly acidic cation exchange resin to blue printing wastewater (COD Cr : 16200mg / L; Chromaticity: 5000 times; Ammonia nitrogen: 327mg / L), stirring reaction for 60min; separate cation exchange resin precipitation from waste water; use precipitation method to separate suspended matter in waste water from waste water; Treated with 10% hydrochloric acid solution to form [R 3 NH] + Cl - Ammonia nitrogen is recovered and the resin is regenerated at the same time; the regenerated hydrogen-type strongly acidic cation exchange resin is added to the printing wastewater for recycling.

[0013] Adopt the method of the present invention to handle, and the decolorization rate of this kind of printing waste water is up to 99.8%, and the removal rate of ammonia nitrogen reaches 90.4%, and COD Cr The removal rate reaches 92.3%, realizing simultaneous decolorization of wastewater and recovery of nitrogen, without significantly increasing the concentration of chlor...

Embodiment 2

[0015] The sodium-type strongly acidic cation exchange resin is pretreated and replaced with a hydrochloric acid solution with a mass concentration of 10%, and then added to the blue printing wastewater (COD Cr : 16200mg / L; Chromaticity: 5000 times; Ammonia nitrogen: 327mg / L), stirring reaction for 60min; separate cation exchange resin precipitation from waste water; use precipitation method to separate suspended matter in waste water from waste water; Treated with 10% hydrochloric acid solution to form [R 3 NH] + Cl - Ammonia nitrogen is recovered and the resin is regenerated at the same time; the regenerated strong acidic cation exchange resin is added to the printing wastewater for recycling.

[0016] Adopt the method of the present invention to handle, and the decolorization rate of this kind of printing waste water is up to 99.8%, and the removal rate of ammonia nitrogen reaches 90.1%, and COD Cr The removal rate reaches 92.2%, realizing simultaneous decolorization of ...

Embodiment 3

[0018] Add hydrogen type strongly acidic cation exchange resin to black printing wastewater (COD Cr : 17800mg / L; Chromaticity: 6000 times; Ammonia nitrogen: 351mg / L), stirring reaction for 180min; separate cation exchange resin precipitation from wastewater; use precipitation method to separate suspended solids in wastewater from wastewater; precipitate cation exchange resin Treat with a sulfuric acid solution with a mass concentration of 4% to form (R 3 NH + ) 2 SO 4 2- The ammonia nitrogen is recovered and the resin is regenerated at the same time; the regenerated cation exchange resin is added to the printing wastewater for recycling.

[0019] Adopt the method of the present invention to process, and the decolorization rate of this kind of water-based ink printing waste water is up to 100%, and the removal rate of ammonia nitrogen reaches 89.6%, and COD Cr The removal rate reaches 93.1%, realizing simultaneous decolorization of wastewater and recovery of nitrogen, with...

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Abstract

The invention discloses a synchronous decoloring and nitrogen recovery method for printing wastewater.The synchronous decoloring and nitrogen recovery method is characterized by including the steps of adding cation exchange resin into the printing wastewater and stirring for 10-180 minutes; separating cation exchange resin precipitate from the wastewater; separating suspended matters in the wastewater from the wastewater by a conventional precipitation method or an air-flotation method; subjecting the precipitated cation exchange resin to dehydration and acid solution treatment sequentially, and recovering nitrogen to enable the resin to regenerate; adding the regenerated cation exchange resin into the printing wastewater and using circularly.The synchronous decoloring and nitrogen recovery method for the printing wastewater has the advantages that according to a treatment method, printing wastewater decolorizing ratio is above 99.5%, ammonium-nitrogen removal rate is above 85%, CODCr removal rate is above 90%, synchronous printing wastewater decoloring and nitrogen recovery are achieved, and the content of acid 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 printing wastewater. Background technique [0002] Ink is composed of pigments, binders, fillers, additives, etc., and can be divided into oil-based inks and water-based inks. Water-based ink is mainly composed of water-soluble resin, pigment, alcohol, amine or ammonia and other additives and water. Because water-based ink has many advantages such as safety and environmental protection, its application is becoming more and more extensive. At present, a large number of plastic packaging (waterproof) materials are increasingly using water-based inks when printing, and a certain amount of printing wastewater is produced during the production process. This kind of wastewater contains pollutants such as pigments, water-soluble acrylic resins, alcohols, and amines (ammonia). It has a lot of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/42
CPCC02F1/24C02F1/42C02F1/52C02F9/00C02F2001/425C02F2101/16C02F2103/30C02F2301/08
Inventor 柳荣展张宾潘颖石宝龙于潘芬于晓王宇琦蔡博文于梦楠
Owner QINGDAO UNIV
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