CN106315714B - Method for extracting high-concentration black printing waste liquid pollutants and preparing decoloring agent - Google Patents
Method for extracting high-concentration black printing waste liquid pollutants and preparing decoloring agent Download PDFInfo
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- CN106315714B CN106315714B CN201610902386.4A CN201610902386A CN106315714B CN 106315714 B CN106315714 B CN 106315714B CN 201610902386 A CN201610902386 A CN 201610902386A CN 106315714 B CN106315714 B CN 106315714B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a method for extracting high-concentration black printing waste liquid pollutants and preparing a decolorizing agent, which comprises the following steps: adding acid into the high-concentration black water-based ink printing waste liquid, and stirring to form pasty sludge; adding calcium mineral powder and pumice particles into the sludge to adjust the specific gravity of the sludge, uniformly stirring, and heating the sludge to 50-90 ℃ for dehydration to form sludge blocks; hot pressing and drying the blocky sludge; insulating the sludge from air, heating to 350-700 ℃, and preserving the heat for 1-4 h; cooling and crushing the sludge into particles, spraying a wetting agent solution, and uniformly mixing to prepare a suspension type cationic dye wastewater decolorizer; adding sludge particles into cationic dye dyeing wastewater, aerating and stirring, removing the sludge particles by air flotation or filtration, recovering, and discharging the wastewater; and recycling the recovered sludge particles after thermal regeneration. The invention realizes the extraction and resource utilization of high-concentration black water-based ink printing waste liquid pollutants, and enables the decolorizing rate of cationic dye dyeing waste water to reach more than 99.5 percent.
Description
Technical Field
The invention belongs to the technical field of printing and dyeing industry, and particularly relates to a method for extracting high-concentration black water-based ink printing waste liquid pollutants and preparing a cationic dye decolorizing agent.
Background
The ink is composed of pigment, binder, filler and additive, and can be divided into oil ink and water-based ink. The oil-based ink contains a large amount of organic solvents, is seriously polluted and is gradually eliminated. The water-based ink mainly consists of water-soluble resin, pigment, alcohol, amine or ammonia and other additives and water, and is simply called water ink. Water-based inks are widely used in various fields because of their health, environmental protection, and safety characteristics. At present, a large amount of plastic packaging materials are printed and printed by adopting water-based ink more and more, printing equipment and a water-based ink storage tank need to be cleaned when the color is changed, and a certain amount of high-concentration water-based ink printing waste liquid is generated. The waste printing liquid contains pigment, water soluble acrylic resin, alcohol, amine and other pollutant, and has high organic matter content, high chroma and serious pollution (chroma over 3 ten thousand times, COD)Cr: 10 ten thousand-50 ten thousand mg/L)And is difficult to handle.
For the treatment of the waste liquid, a physical and chemical method such as a coagulation method and the like is usually adopted for pretreatment, namely, a coagulant is added into the waste liquid to coagulate pollutants into sludge, because the solid content of the sludge is high, a mechanical dehydration method such as filter pressing, centrifugal dehydration and the like is directly adopted for solid-liquid separation, and the effluent is subjected to other chemical or biological treatment until the effluent reaches the standard and is discharged. Because the concentration of pollutants in the waste liquid is high, the solid content of the formed sludge is as high as 5-10%, the sludge has strong hydrophilicity and is difficult to dehydrate, and the water content of a mud cake is still as high as more than 80%. The mud cake formed after mechanical filter pressing or centrifugal dehydration is generally used as solid waste for landfill treatment, so that secondary pollution is easily caused, and resource utilization cannot be realized.
Disclosure of Invention
The invention aims to provide a method for extracting high-concentration black water-based ink printing waste liquid pollutants and preparing a cationic dye decolorizing agent.
In order to achieve the purpose, the invention adopts the following technical method:
adding acid into the high-concentration black water-based ink printing waste liquid, stirring for 5-30min to form pasty sludge, adding 5-10g/L calcium mineral powder and 10-50g/L pumice particles into the sludge according to the solid content of the sludge to adjust the specific gravity of the sludge, uniformly stirring, heating the sludge to 50-90 ℃ while stirring, and dehydrating to form the sludge into blocks; hot pressing the blocky sludge until the water content is lower than 50%, and then drying or naturally drying; insulating the sludge from air, heating to 350-700 ℃, and preserving the heat for 1-4 h; cooling the sludge to below 50 ℃, crushing the sludge into granules, uniformly spraying a wetting agent solution with the mass concentration of 0.1-0.2%, and uniformly mixing to prepare a suspension type cationic dye wastewater decolorizer; adding sludge particles into cationic dye dyeing wastewater according to the adding amount of 2-10g/L wastewater, aerating and stirring for 10-60min to enable the wastewater decolorization rate to reach more than 99.5%, removing the sludge particles by air floatation or filtration, recovering, and discharging wastewater; the recovered sludge particles are recycled after being thermally regenerated at 450 ℃ and 700 ℃.
Has the advantages that:
a. the high-concentration black water-based ink printing waste liquid is treated by the method, and the waste liquid decolorization rate is highUp to over 99.5 percent, CODCrThe removal rate reaches more than 80 percent, and the extraction rate of organic pollutants reaches more than 90 percent. The dehydration rate of the generated sludge reaches more than 90 percent, the volume reduction is more than 90 percent, and the deep dehydration of the sludge is realized;
b. the extracted pollutants are treated by the method and used for decolorizing the cationic dye dyeing wastewater, the wastewater decolorization rate is close to 100 percent, the resource utilization of solid waste is realized, the secondary pollution problem of sludge is avoided, and the pollutants can be recycled;
c. the sludge particles are suspended in the cationic dye dyeing wastewater, the decolorizing speed is high, and the capital investment can be reduced.
Detailed Description
The invention is further illustrated by the following specific examples.
Example 1
Adding 92% sulfuric acid into the high-concentration black water-based ink printing waste liquid, and stirring for 15min to enable pollutants to be condensed; adding 6.1g/L calcium mineral powder and 18.3g/L pumice into the sludge according to the solid content of the sludge, uniformly stirring, heating the sludge to 75 ℃ while stirring, and dehydrating to form sludge into blocks; hot pressing the blocky sludge until the water content is lower than 50%, and then naturally drying; heating the sludge to 550 ℃ in an air-isolated manner, and preserving heat for 1 h; cooling the sludge to below 50 ℃, crushing the sludge into granules, uniformly spraying a wetting agent solution with the mass concentration of 0.1%, and uniformly mixing to prepare a cationic dye wastewater decolorizer; continuously adding sludge particles into red cationic dye dyeing wastewater according to the adding amount of 5g/L wastewater, stirring for 60min to decolorize the wastewater, filtering to remove the sludge particles, and discharging the wastewater, wherein the decolorizing rate of the red cationic dye dyeing wastewater is 99.6%; the sludge particles are recycled after being recycled and regenerated at 550 ℃.
Continuously adding 10 times of regenerated sludge particles into blue cationic dye dyeing wastewater according to the adding amount of 6g/L wastewater, and stirring for 30min to decolorize the wastewater, wherein the decolorizing rate of the blue cationic dye dyeing wastewater is 99.7%.
By adopting the method, the high-efficiency treatment of the high-concentration black water-based ink printing waste liquid, the high-efficiency extraction and the resource utilization of pollutants are realized, the secondary pollution is avoided, the decoloring rate of the red cationic dye dyeing waste water and the blue cationic dye dyeing waste water is up to more than 99.5%, the decoloring rate is high, the particles are easy to filter, and a new way for the resource utilization of solid waste is developed.
Example 2
Adding 92% sulfuric acid into the high-concentration black water-based ink printing waste liquid, and stirring for 10min to enable pollutants to be condensed; adding 9g/L calcium mineral powder and 27g/L pumice into the sludge according to the solid content of the sludge, stirring uniformly, heating the sludge to 80 ℃ while stirring, and dehydrating to form the sludge into blocks; hot pressing the blocky sludge until the water content is lower than 50%, and then naturally drying; heating the sludge to 500 ℃ in an air-isolated manner, and keeping the temperature for 2 h; cooling the sludge to below 50 ℃, crushing the sludge into granules, uniformly spraying a wetting agent solution with the mass concentration of 0.1%, and uniformly mixing to prepare a cationic dye wastewater decolorizer; continuously adding sludge particles into the mixed cationic dye dyeing wastewater according to the adding amount of 5g/L wastewater, stirring for 60min to decolorize the wastewater, filtering to remove the sludge particles, and discharging the wastewater, wherein the decolorizing rate of the red cationic dye dyeing wastewater is 99.6%; the sludge particles are recycled after being recycled and regenerated at 550 ℃.
Continuously adding 10 times of regenerated sludge particles into black cationic dye dyeing wastewater according to the adding amount of 8g/L wastewater, and stirring for 30min to decolorize the wastewater, wherein the decolorization rate of the black cationic dye dyeing wastewater is 99.9%.
By adopting the method, the high-efficiency treatment of the high-concentration black water-based ink printing waste liquid, the high-efficiency extraction and the resource utilization of pollutants are realized, the secondary pollution is avoided, the decoloring rate of the mixed cationic dye dyeing waste water and the black cationic dye dyeing waste water is up to more than 99.5%, the decoloring speed is high, the particles are easy to separate, and a new way for the resource utilization of solid waste is developed.
Example 3
Adding 40% hydrochloric acid into the high-concentration black water-based ink printing waste liquid, and stirring for 15min to coagulate pollutants; adding 6.5g/L calcium mineral powder and 20g/L pumice into the sludge according to the solid content of the sludge, stirring uniformly, heating the sludge to 75 ℃ while stirring, and dehydrating to form the sludge into blocks; hot pressing the blocky sludge until the water content is lower than 50%, and then naturally drying; heating the sludge to 550 ℃ in an air-isolated manner, and preserving the heat for 1.5 h; cooling the sludge to below 50 ℃, crushing the sludge into granules, uniformly spraying a wetting agent solution with the mass concentration of 0.1%, and uniformly mixing to prepare a cationic dye wastewater decolorizer; continuously adding sludge particles into yellow cationic dye dyeing wastewater according to the adding amount of 6g/L wastewater, stirring for 60min to decolorize the wastewater, filtering to remove the sludge particles, and discharging the wastewater, wherein the decolorizing rate of the red cationic dye dyeing wastewater is 99.5%; the sludge particles are recycled after being recycled and regenerated at 550 ℃.
Continuously adding the regenerated sludge particles for 5 times into the red cationic dye dyeing wastewater according to the adding amount of 7g/L wastewater, and stirring for 30min to decolorize the wastewater, wherein the decolorization rate of the red cationic dye dyeing wastewater is 99.6%.
By adopting the method, the high-efficiency treatment of the high-concentration black water-based ink printing waste liquid, the high-efficiency extraction and the resource utilization of pollutants are realized, the secondary pollution is avoided, the decoloring rate of the yellow cationic dye dyeing waste water and the red cationic dye dyeing waste water is up to more than 99.5%, the decoloring rate is high, the particles are easy to separate, and a new way for the resource utilization of solid waste is developed.
Claims (5)
1. A method for extracting high-concentration black water-based ink printing waste liquid pollutants and preparing a decolorizing agent comprises the following steps:
adding acid into the high-concentration black water-based ink printing waste liquid, stirring for 5-30min to form pasty sludge, adding 5-10g/L calcium mineral powder and 10-50g/L pumice particles into the sludge according to the solid content of the sludge to adjust the specific gravity of the sludge, uniformly stirring, heating the sludge to 50-90 ℃ while stirring, and dehydrating to form the sludge into blocks; hot pressing the blocky sludge until the water content is lower than 50%, and then drying or naturally drying; insulating the sludge from air, heating to 350-700 ℃, and preserving the heat for 1-4 h; cooling the sludge to below 50 ℃, crushing the sludge into granules, uniformly spraying a wetting agent solution with the mass concentration of 0.1-0.2%, and uniformly mixing to prepare a suspension type cationic dye wastewater decolorizer; adding the decolorizing agent into cationic dye dyeing wastewater according to the adding amount of 2-10g/L wastewater, aerating and stirring for 10-60min to enable the wastewater decolorizing rate to reach more than 99.5%, removing the decolorizing agent by air floatation or filtration and recovering, and discharging wastewater; the decolorant is recovered and recycled after being thermally regenerated at the temperature of 450 ℃ and 700 ℃.
2. The method for extracting pollutants from high-concentration black water-based ink printing waste liquid and preparing the decoloring agent according to claim 1, wherein the acid is an inorganic acid or an organic acid.
3. The method for extracting pollutants from high-concentration black water-based ink printing waste liquid and preparing the decoloring agent according to claim 1, wherein the calcium ore powder is calcium carbonate, calcium oxide or a mixture thereof.
4. The method for extracting pollutants from high-concentration black water-based ink printing waste liquid and preparing a decoloring agent according to claim 1, wherein the wetting agent is a nonionic or anionic wetting agent or a mixture thereof.
5. The method for extracting pollutants from high-concentration black water-based ink printing waste liquid and preparing a decoloring agent as claimed in claim 1, wherein the pumice particles are 100-300 mesh.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101362073A (en) * | 2008-09-27 | 2009-02-11 | 山东大学 | Preparation method of acidification sludge bentonite granules |
| CN102205964A (en) * | 2011-04-25 | 2011-10-05 | 山东大学 | Granular activated carbon filler for paper mill sludge and preparation method thereof |
| CN103752274A (en) * | 2013-12-12 | 2014-04-30 | 西北农林科技大学 | Amphiprotic-Gemini type cationic composite adsorbent, and preparation method thereof |
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| CN101811021B (en) * | 2010-04-26 | 2011-12-14 | 西北农林科技大学 | Amphiphilic adsorbent capable of adsorbing both organic matter and heavy metal cation and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101362073A (en) * | 2008-09-27 | 2009-02-11 | 山东大学 | Preparation method of acidification sludge bentonite granules |
| CN102205964A (en) * | 2011-04-25 | 2011-10-05 | 山东大学 | Granular activated carbon filler for paper mill sludge and preparation method thereof |
| CN103752274A (en) * | 2013-12-12 | 2014-04-30 | 西北农林科技大学 | Amphiprotic-Gemini type cationic composite adsorbent, and preparation method thereof |
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