Composite flocculant for treating printing and dyeing wastewater

Abstract

The invention discloses a composite flocculant for treating printing and dyeing wastewater. The composite flocculant for treating the printing and dyeing wastewater is prepared from the following rawmaterials in parts by weight: 15-25 parts of activated carbon fibers, 4-11 parts of acrylamide, 2-9 parts of sodium carboxymethyl cellulose, 5-17 parts of polyvinyl alcohol, 3-6 parts of a crosslinking agent, 0.003-0.006 part of an initiator, 3-5 parts of a polyethyleneimine-cellulose composite material, 10-15 parts of starch xanthate and 25-36 parts of modified bentonite. The composite flocculantprovided by the invention does not contain components which are complicated, have radiation and easily cause secondary pollution, all the used raw materials are natural, environment-friendly, low inprice and easy to obtain, the preparation method is simple, the feeding amount is small, the composite flocculant has multiple effects of flocculation sedimentation, adsorption decolorization, deodorization and the like, the sedimentation rate is high, the removal rates of organic matters, dye molecules and heavy metals are high, the structure and properties are stable, and the application range is wide.

Description

technical field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a composite flocculant for printing and dyeing wastewater treatment. Background technique

[0002] Printing and dyeing wastewater is wastewater discharged from printing and dyeing factories that mainly process cotton, hemp, chemical fibers and their blended products. Printing and dyeing wastewater has a large amount of water, 100-200 tons of water is consumed per ton of textile printing and dyeing, and 80-90% of it becomes wastewater. Textile printing and dyeing wastewater has the characteristics of large water volume, high content of organic pollutants, high alkalinity, and large changes in water quality. It is one of the most difficult industrial wastewater to treat. Impurities, sand substances, inorganic salts, etc.

[0003] At present, the common flocculants on the market, including polyferric sulfate, polyaluminum sulfate, etc., need a certain coagulant aid wh...

Examples

Embodiment 1

[0034] A composite flocculant for printing and dyeing wastewater treatment, prepared from the following raw materials in parts by weight: 15 parts of activated carbon fiber, 4 parts of acrylamide, 0.003 parts of initiator, 2 parts of sodium carboxymethyl cellulose, and 5 parts of polyvinyl alcohol , 3 parts of crosslinking agent, 3 parts of polyethyleneimine-cellulose composite material, 10 parts of starch xanthate, 25 parts of modified bentonite.

[0035] Further, the activated carbon fiber is obtained from biomass material through hydrothermal carbonization and sulfuric acid activation; its preparation method is as follows:

[0036] (1) removing impurities, washing and drying the biomass material for subsequent use;

[0037](2) adding the dried biomass material into the hydrothermal reaction kettle, adding deionized water, immersing the biomass material, programmatically heating up to 220°C, and cooling to normal temperature after reacting for 24 hours;

[0038] (3) washing...

Embodiment 2

[0051] A composite flocculant for printing and dyeing wastewater treatment is prepared from the following raw materials in parts by weight: 17 parts of activated carbon fibers, 6 parts of acrylamide, 0.004 parts of initiator, 5 parts of sodium carboxymethyl cellulose, and 9 parts of polyvinyl alcohol , 4 parts of cross-linking agent, 4 parts of polyethyleneimine-cellulose composite material, 12 parts of starch xanthate, and 30 parts of modified bentonite.

[0052] Further, the activated carbon fiber is obtained from biomass material through hydrothermal carbonization and sulfuric acid activation; its preparation method is as follows:

[0053] (1) The biomass material is used for subsequent use after removing impurities, washing and drying;

[0054] (2) adding the dried biomass material into the hydrothermal reaction kettle, adding deionized water, immersing the biomass material, programmatically heating up to 220°C, and cooling to normal temperature after reacting for 24 hours...

Embodiment 3

[0068] A composite flocculant for printing and dyeing wastewater treatment is prepared from the following raw materials in parts by weight: 23 parts of activated carbon fibers, 9 parts of acrylamide, 0.005 parts of initiator, 7 parts of sodium carboxymethyl cellulose, and 13 parts of polyvinyl alcohol , 5 parts of crosslinking agent, 4.5 parts of polyethyleneimine-cellulose composite material, 14 parts of starch xanthate, and 32 parts of modified bentonite.

[0069] Further, the activated carbon fiber is obtained from biomass material through hydrothermal carbonization and sulfuric acid activation; its preparation method is as follows:

[0070] (1) The biomass material is used for subsequent use after removing impurities, washing and drying;

[0071] (2) adding the dried biomass material into the hydrothermal reaction kettle, adding deionized water, immersing the biomass material, programmatically heating up to 220°C, and cooling to normal temperature after reacting for 24 hou...

technical field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a composite flocculant for printing and dyeing wastewater treatment. Background technique

[0002] Printing and dyeing wastewater is wastewater discharged from printing and dyeing factories that mainly process cotton, hemp, chemical fibers and their blended products. Printing and dyeing wastewater has a large amount of water, 100-200 tons of water is consumed per ton of textile printing and dyeing, and 80-90% of it becomes wastewater. Textile printing and dyeing wastewater has the characteristics of large water volume, high content of organic pollutants, high alkalinity, and large changes in water quality. It is one of the most difficult industrial wastewater to treat. Impurities, sand substances, inorganic salts, etc.

[0003] At present, the common flocculants on the market, including polyferric sulfate, polyaluminum sulfate, etc., need a certain coagulant aid wh...

Examples

Embodiment 1

[0034] A composite flocculant for printing and dyeing wastewater treatment, prepared from the following raw materials in parts by weight: 15 parts of activated carbon fiber, 4 parts of acrylamide, 0.003 parts of initiator, 2 parts of sodium carboxymethyl cellulose, and 5 parts of polyvinyl alcohol , 3 parts of crosslinking agent, 3 parts of polyethyleneimine-cellulose composite material, 10 parts of starch xanthate, 25 parts of modified bentonite.

[0035] Further, the activated carbon fiber is obtained from biomass material through hydrothermal carbonization and sulfuric acid activation; its preparation method is as follows:

[0036] (1) removing impurities, washing and drying the biomass material for subsequent use;

[0037](2) adding the dried biomass material into the hydrothermal reaction kettle, adding deionized water, immersing the biomass material, programmatically heating up to 220°C, and cooling to normal temperature after reacting for 24 hours;

[0038] (3) washing...

Embodiment 2

[0051] A composite flocculant for printing and dyeing wastewater treatment is prepared from the following raw materials in parts by weight: 17 parts of activated carbon fibers, 6 parts of acrylamide, 0.004 parts of initiator, 5 parts of sodium carboxymethyl cellulose, and 9 parts of polyvinyl alcohol , 4 parts of cross-linking agent, 4 parts of polyethyleneimine-cellulose composite material, 12 parts of starch xanthate, and 30 parts of modified bentonite.

[0052] Further, the activated carbon fiber is obtained from biomass material through hydrothermal carbonization and sulfuric acid activation; its preparation method is as follows:

[0053] (1) The biomass material is used for subsequent use after removing impurities, washing and drying;

[0054] (2) adding the dried biomass material into the hydrothermal reaction kettle, adding deionized water, immersing the biomass material, programmatically heating up to 220°C, and cooling to normal temperature after reacting for 24 hours...

Embodiment 3

[0068] A composite flocculant for printing and dyeing wastewater treatment is prepared from the following raw materials in parts by weight: 23 parts of activated carbon fibers, 9 parts of acrylamide, 0.005 parts of initiator, 7 parts of sodium carboxymethyl cellulose, and 13 parts of polyvinyl alcohol , 5 parts of crosslinking agent, 4.5 parts of polyethyleneimine-cellulose composite material, 14 parts of starch xanthate, and 32 parts of modified bentonite.

[0069] Further, the activated carbon fiber is obtained from biomass material through hydrothermal carbonization and sulfuric acid activation; its preparation method is as follows:

[0070] (1) The biomass material is used for subsequent use after removing impurities, washing and drying;

[0071] (2) adding the dried biomass material into the hydrothermal reaction kettle, adding deionized water, immersing the biomass material, programmatically heating up to 220°C, and cooling to normal temperature after reacting for 24 hou...

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