CN106477640B - Cationic dye wastewater decolorizer and preparation method thereof - Google Patents
Cationic dye wastewater decolorizer and preparation method thereof Download PDFInfo
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- CN106477640B CN106477640B CN201610904386.8A CN201610904386A CN106477640B CN 106477640 B CN106477640 B CN 106477640B CN 201610904386 A CN201610904386 A CN 201610904386A CN 106477640 B CN106477640 B CN 106477640B
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- sludge
- cationic dye
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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
Abstract
The invention discloses a cationic dye wastewater decolorizer and a preparation method thereof, wherein the decolorizer mainly comprises 80-90 parts by mass of sludge extracted from black water-based ink printing waste liquid, 5-10 parts by mass of sepiolite and 5-10 parts by mass of calcium mineral powder, and the preparation method comprises the following steps: adjusting black water-based ink printing waste liquor acidification sludge into slurry with solid content of 10%, and adding alkaline substances to neutralize to be neutral; adding a certain amount of sepiolite and calcium mineral powder into the sludge; heating and dehydrating the sludge while stirring to form the sludge into blocks; hot pressing the blocky sludge until the water content is lower than 50%, and drying; insulating the sludge from air, heating to 350-700 ℃, and preserving the heat for 1-5 h; the sludge is crushed into particles after being cooled to a certain temperature, and the cationic dye wastewater decolorizer is prepared. The method realizes the extraction and resource utilization of pollutants in the printing waste liquid of the high-concentration black water-based ink, and the prepared decoloration enables the decoloration rate of the cationic dye dyeing waste water to reach more than 99.5 percent and can be recycled.
Description
Technical Field
The invention belongs to the technical field of environmental protection engineering, and particularly relates to a cationic dye wastewater decolorizer and a preparation method thereof.
Background
The cationic dye is mainly used for acrylic fiber dyeing and printing, and has high dye uptake and wide application. However, the cationic dye dyeing wastewater is good in water solubility and resistant to oxidation reduction reaction, so that the cationic dye dyeing wastewater is difficult to decolorize, and the cationic dye dyeing wastewater is mostly treated by adopting a chemical coagulation, adsorption or ion exchange method in actual production.
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, and a certain amount of high-concentration water-based ink printing waste liquid is generated in the application process. 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 to 50 ten thousand mg/L) are difficult to handle. The pretreatment is usually carried out by a physical and chemical method such as coagulation, i.e. coagulant is added into the waste liquid to coagulate the pollutants into sludge, and mechanical dehydration methods such as filter pressing and centrifugal dehydration are adopted to carry out solid-liquid separationSeparating, and performing other chemical or biological treatment on the effluent until the effluent reaches the standard and is discharged. Because the concentration of the pollutants in the waste liquid is high, the solid content of the formed sludge is up to 5-10%, and the water content of the dewatered sludge cake is still up to more than 80%. The mud cake formed by mechanical filter pressing or centrifugal dewatering is generally used as solid waste for landfill treatment, and secondary pollution is easily caused.
Disclosure of Invention
The invention aims to provide a method for preparing a cationic dye wastewater decolorizer by using a black water-based ink printing waste liquid extract.
A cationic dye wastewater decolorizer mainly comprises 80-90 parts by weight of sludge extracted from black water-based ink printing waste liquid, 5-10 parts by weight of sepiolite and 5-10 parts by weight of calcium mineral powder, and the preparation method comprises the following steps: preparing sludge extracted from black water-based ink printing waste liquid into slurry with solid content of 10%, and adding alkaline substances to neutralize the slurry to be neutral; adding 5-15% of sepiolite and 5-15% of calcium mineral powder (based on the dry weight of the absolutely dry sludge) into the sludge, uniformly stirring, and adjusting the specific gravity of the sludge; heating the sludge to 50-90 ℃ while stirring for dehydration to form the sludge into blocks, and discharging dehydrated water; hot pressing the blocky sludge until the water content is lower than 50%, and drying; insulating the sludge from air, heating to 350-700 ℃, and preserving the heat for 1-5 h; the sludge is crushed into particles after being cooled to a certain temperature, and the cationic dye wastewater decolorizer is prepared.
The invention has the following advantages:
a. the decolorizing agent prepared from the high-concentration black water-based ink printing waste liquid extract is used for decolorizing cationic dye dyeing waste water, the decolorizing rate is close to 100 percent, and the decolorizing speed is high;
b. the cationic dye dyeing wastewater decolorizer is prepared from the high-concentration black water-based ink printing waste liquid extract, so that the resource utilization of solid waste is realized, and the problem of secondary pollution of sludge is avoided;
c. the decolorizing agent can be recycled after being thermally regenerated at the temperature of 450 ℃ and 750 ℃ without changing the effect.
Detailed Description
The invention is further illustrated by the following specific examples.
Example 1
A cationic dye wastewater decolorizer mainly comprises 82 parts by weight of sludge extracted from black water-based ink printing waste liquid, 10 parts of sepiolite and 8 parts of calcium mineral powder. The preparation method comprises the following steps: adjusting black water-based ink printing waste liquor acidification sludge into slurry with solid content of 10%, and adding alkaline substances to neutralize to be neutral; adding 12.2 percent of sepiolite and 9.7 percent of calcium mineral powder (based on the dry weight of the absolutely dry sludge) into the sludge, uniformly stirring, and adjusting the specific gravity of the sludge; heating the sludge to 75 ℃ while stirring for dehydration to form the sludge into blocks, and discharging dehydrated water; hot pressing the blocky sludge until the water content is lower than 50%, and drying; heating the sludge to 500 ℃ in an air-isolated manner, and keeping the temperature for 2 h; and (3) cooling the sludge, and crushing the sludge into particles to prepare the cationic dye wastewater decolorizer.
Adding the prepared decolorizing agent into the red cationic dye dyeing wastewater according to the adding amount of 6g/L wastewater, stirring for 30min, precipitating to remove sludge particles, and decolorizing the wastewater with the decolorizing rate of 99.7%; the sludge particles can be recycled after being recycled and regenerated at 600 ℃.
By adopting the method, the high-efficiency extraction and resource utilization of pollutants in the high-concentration black water-based ink printing waste liquid are realized, the secondary pollution is avoided, the decolorizing rate of the cationic dye dyeing waste water reaches more than 99.5 percent, the decolorizing speed is high, the particles are easy to precipitate, and a new way for utilizing solid waste resources is developed.
Example 2
A cationic dye wastewater decolorizer mainly comprises 90 parts by weight of sludge extracted from black water-based ink printing waste liquid, 5 parts of sepiolite and 5 parts of calcium mineral powder. The preparation method comprises the following steps: adjusting black water-based ink printing waste liquor acidification sludge into slurry with solid content of 10%, and adding alkaline substances to neutralize to be neutral; adding 5.5 percent of sepiolite and 5.5 percent of calcium mineral powder (based on the dry weight of the absolutely dry sludge) into the sludge, uniformly stirring, and adjusting the specific gravity of the sludge; heating the sludge to 75 ℃ while stirring for dehydration to form the sludge into blocks, and discharging dehydrated water; hot pressing the blocky sludge until the water content is lower than 50%, and drying; heating the sludge to 550 ℃ in an air-isolated manner, and preserving heat for 2 hours; and (3) cooling the sludge, and crushing the sludge into particles to prepare the cationic dye wastewater decolorizer.
Adding the prepared decolorizing agent into blue cationic dye dyeing wastewater according to the adding amount of 8g/L wastewater, stirring for 20min, precipitating to remove sludge particles, and decolorizing the wastewater with the decolorizing rate of 99.9%; the sludge particles can be recycled after being recycled and regenerated at 550 ℃.
By adopting the method, the high-efficiency extraction and resource utilization of pollutants in the high-concentration black water-based ink printing waste liquid are realized, the secondary pollution is avoided, the decolorizing rate of the cationic dye dyeing waste water reaches nearly 100 percent, the decolorizing speed is high, the particles are easy to precipitate, and a new way for solid waste resource utilization is developed.
Example 3
A cationic dye wastewater decolorizer mainly comprises 85 parts by weight of sludge extracted from black water-based ink printing waste liquid, 8 parts of sepiolite and 7 parts of calcium mineral powder. The preparation method comprises the following steps: adjusting black water-based ink printing waste liquor acidification sludge into slurry with solid content of 10%, and adding alkaline substances to neutralize to be neutral; adding 9.4 mass percent of sepiolite and 8.2 mass percent of calcium mineral powder (based on the dry weight of the absolutely dry sludge) into the sludge, uniformly stirring, and adjusting the specific gravity of the sludge; heating the sludge to 82 ℃ while stirring for dehydration to form the sludge into blocks, and discharging dehydrated water; hot pressing the blocky sludge until the water content is lower than 50%, and drying; heating the sludge to 500 ℃ in an air-isolated manner, and keeping the temperature for 2 h; and (3) cooling the sludge, and crushing the sludge into particles to prepare the cationic dye wastewater decolorizer.
Adding the prepared decolorizing agent into the mixed cationic dye dyeing wastewater according to the adding amount of 10g/L wastewater, stirring for 30min, precipitating to remove sludge particles, and decolorizing the wastewater with the decolorizing rate of 99.8%; the sludge particles can be recycled after being recycled and regenerated at 600 ℃.
By adopting the method, the high-efficiency extraction and resource utilization of pollutants in the high-concentration black water-based ink printing waste liquid are realized, the secondary pollution is avoided, the decolorizing rate of the cationic dye dyeing waste water reaches nearly 100 percent, the decolorizing speed is high, the particles are easy to precipitate, and a new way for solid waste resource utilization is developed.
Example 4
The recycled decolorant is thermally regenerated at 600 ℃, added into black cationic dye dyeing wastewater according to the adding amount of 10g/L wastewater, stirred for 30min, precipitated to remove sludge particles, the wastewater decoloration rate is 99.8%, and the decoloration effect is not obviously changed.
By adopting the method, the high-efficiency extraction and resource utilization of pollutants in the high-concentration black water-based ink printing waste liquid are realized, the secondary pollution is avoided, a new way for resource utilization of solid waste is developed, and the method can be recycled.
Claims (1)
1. A preparation method of a cationic dye wastewater decolorizer is characterized in that the decolorizer mainly comprises 80-90 parts by mass of sludge extracted from black water-based ink printing waste liquid, 5-10 parts by mass of sepiolite and 5-10 parts by mass of calcium mineral powder, and the preparation method comprises the following steps:
preparing sludge extracted from black water-based ink printing waste liquid into slurry with certain solid content, and adding alkaline substances to neutralize the slurry to be neutral;
adding 5-15% by mass of sepiolite and 5-15% by mass of calcium mineral powder into sludge, based on the dry weight of the absolutely dry sludge, uniformly stirring, adjusting the specific gravity of the sludge, heating the sludge to 75-90 ℃ while stirring for dehydration to form the sludge into blocks, and discharging the dehydrated water;
hot pressing the blocky sludge until the water content is lower than 50%, and drying;
insulating the sludge from air, heating to 350-700 ℃, and preserving the heat for 1-5 h;
the sludge is crushed into particles after being cooled to a certain temperature, and the cationic dye wastewater decolorizer is prepared;
wherein the sludge extracted from the black water-based ink printing waste liquid is acid precipitation sludge; the specific gravity of the sepiolite is more than 1.0g/m3The particle size is 100-300 meshes; the calcium mineral powder is calcium carbonate, calcium oxide or a mixture thereof.
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