Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Decoloring and nitrogen recycling synchronous method for high-concentration printing waste liquid

A recycling method and high-concentration technology, applied in the textile printing and dyeing industry, can solve the problems of inability to remove ammonia nitrogen at the same time, secondary pollution, easy formation of brackish water, etc., and achieve the effects of preventing secondary pollution, facilitating resin regeneration, and reducing solubility.

Active Publication Date: 2016-06-15
QINGDAO UNIV
View PDF5 Cites 0 Cited by
  • 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 liquid, causes secondary pollution, and easily forms brackish water

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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 dissolved air water flotation to treat the paste sludge, so that The sludge floats completely; remove the floating sludge layer and dewater by mechanical pressure filtration; discharge the cation exchange resin precipitated at the bottom; filter and dehydrate the discharged cation exchange resin and treat it 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 pr...

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 dissolved air water flotation to treat the paste sludge, Completely float the sludge; remove the floating sludge layer and dewater by mechanical pressure filtration; discharge the cation exchange resin precipitated at the bottom; filter and dehydrate the discharged cation exchange resin and treat it 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.

[0017] Adopt ...

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 120min, until the waste liquid reacts into a paste sludge; use the treated waste water as dissolved air water flotation to treat the paste sludge, Completely float the sludge; remove the floating sludge layer and dewater by mechanical pressure filtration; discharge the cation exchange resin precipitated at the bottom; filter and dehydrate the discharged cation exchange resin and treat it 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.

[0020] Adopt the method of the present invention to process, the decolorization rate of this kind of printing waste liqu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
decolorization rateaaaaaaaaaa
Login to View More

Abstract

The invention discloses a decoloring and nitrogen recycling synchronous method for high-concentration printing waste liquid, characterized by comprising the following steps: adding cationic exchange resin into certain high-concentration printing waste liquid, and stirring until the waste liquid reacts into pasty sludge; using treated waste water as dissolved air water to treat the pasty sludge by air flotation treatment so that sludge completely floats up; removing the floating sludge layer, and press-filtering and dewatering in a mechanical manner; discharging the cationic exchange resin settling to the bottom; filtering and dewatering the discharged cationic exchange resin, treating with an acid solution, recycling nitrogen, and regenerating the resin; adding the regenerated cationic exchange resin into high-centration waste liquid for cyclic use.The treatment method of the invention has printing waste liquid decoloring rate up to higher than 99.5%, ammonia and nitrogen removal rate up to higher than 90% and CODCr removal rate up to higher than 90%, provides synchronization of decoloring and nitrogen recycling for the waste liquid, causes no increase in the content of acid group ions in the waste water and also provides effective solid-liquid separation.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/30C02F101/16
CPCC02F1/001C02F1/24C02F1/42C02F9/00C02F2101/16C02F2103/30
Inventor 柳荣展张宾潘颖邹译慧于梦楠于晓于潘芬蔡博文
Owner QINGDAO UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com