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Method for producing coagulant for active dye wastewater

A technology for printing and dyeing wastewater and reactive dyes, which is used in textile industry wastewater treatment, flocculation/sedimentation water/sewage treatment, etc. Effect

Inactive Publication Date: 2011-06-15
上海康鸣高科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2. There are a lot of electrolytes (such as alkali and salt) in the wastewater
[0005] 3. Certain properties of dyes cannot fully meet the needs of printing and dyeing, etc.
[0029] One of the primary tasks of treating this type of wastewater is decolorization. In the current situation, the commonly used treatment agents are aluminum-based and iron-based coagulants, as well as dicyandiamide-formaldehyde (DC), polyacrylamine (PAM), dimethyl A cationic blend flocculant such as base-diallyl ammonium hydrogenated polymer DADMAC is not effective in the treatment of reactive dye wastewater, and the decolorization rate is ~60%. Ammonia nitrogen exceeds the standard, causing new pollution to water quality

Method used

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  • Method for producing coagulant for active dye wastewater
  • Method for producing coagulant for active dye wastewater
  • Method for producing coagulant for active dye wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A: Polyvinyl alcohol (1750±50) 50g

[0053] Na 2 SiO 3 100g, deionized water 10×90g

[0054] Stir at 95°C for 6 hours to obtain A with a solid content of 14% and pH=7.5

[0055] B: Bisphenol S type epoxy resin 50g

[0056] The preparation method of bisphenol S type epoxy resin is known aqueous solution polymerization or inverse emulsion polymerization. We adopt the aqueous solution method, add 25 grams of bisphenol S, deionized water and additives into a three-necked flask, add a small amount of sodium hydroxide to adjust the pH to 9-10, add 9.25 grams of epichlorohydrin dropwise, keep the temperature at 40-60ηC, and place The polymerization reaction is carried out in a constant temperature water bath for 0.5-6 hours, and the homogeneous solution is diluted with water to obtain an aqueous solution with a solid content of 40%. The molar ratio of raw materials is: bisphenol S: epichlorohydrin = 1: 1. 50 grams of deionized water. Heated at 60°C for 2h and stirred...

Embodiment 2

[0063] A: In the preparation method of polyethylene, sodium silicate is changed to NaOH

[0064] B, C, D are the same as above

[0065] A: 12 parts, B: 83 parts, C: 5 parts, heated at 50°C in a three-necked flask with a condenser, stirred for 1 hour, and cooled for later use.

[0066] In actual use, one part of the above-mentioned mixture of A, B and C, and one part of component D are used in combination.

Embodiment 3

[0068] A, B (sodium silicate is changed to sodium phosphate), C, D preparation methods are the same as above

[0069] A: 6 parts, B: 86 parts, C: 8 parts. Heat to 50°C with a three-necked flask with a condenser, stir for 18 hours, and cool for later use.

[0070] In actual use, one part of the above-mentioned mixture of A, B and C, and one part of component D are used in combination.

[0071] Table 1 Effects of coagulation and decolorization agent for printing and dyeing wastewater of compound reactive dyes

[0072] decolorizer

Dosage (ppm)

Operating temperature

pH value of coagulation tank

COD (mg / L)

Chroma

0

60

6.5

650

49

Example 1 *

100

60

7.2

75

4

Example 2

120

65

7.5

88

8

Example 3

120

65

7.7

79

8

[0073] Note: 1. The experimental wastewater is the wastewater dilution solution of Zhejiang Jinding Ribbon Printing...

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Abstract

The invention relates to a printing and dyeing industrial wastewater treatment technology, and discloses a novel formula of a coagulation decolorant for active dye wastewater. The coagulation decolorant is a compound coagulation decolorant which is prepared by blending sodium polyacrylate serving as an additive, alkaline aqueous solution of polyvinyl alcohol, and dicyandiamine-formaldehyde polycondensate. The process equipment is general equipment, and raw materials are readily available. The formula of the coagulation decolorant is suitable for treating active dye wastewater and wastewater generated after printing and dyeing process production of cotton knitted fabrics, linen knitted fabrics and the like; and the wastewater mainly contains s-triazines, halogenated pyridines, vinyl sulfones and double active radical type compounds. The decolorization rate of the coagulation decolorant is more than 90 percent.

Description

technical field [0001] The invention relates to a decolorization treatment technology for printing and dyeing wastewater, in particular to a decolorization technology for printing and dyeing wastewater, the main components of which are s-triazines, vinyl sulfones, halogenated pyrimidines and dual reactive dyes (monochloro-s-triazine The production method of the printing and dyeing wastewater decolorization coagulant composite agent based on β-sulfate ethyl sulfone, two monochloro-s-triazines, etc. Background technique [0002] The discharge of wastewater in the printing and dyeing industry is a kind of industrial wastewater with high concentration, complex composition and high chroma. All countries in the world and our country have strict regulations on the discharge of this type of wastewater. Among them, the printing and dyeing process of reactive dyes has become an important dye for cellulose fiber dyeing, wool, knitted fabrics, silk fabrics, and synthetic fibers due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F103/30
Inventor 赵敏吴范宏郭飞俞晓东
Owner 上海康鸣高科技有限公司
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