Preparation method of coagulative decolorant for recycling dyeing wastewater

A printing and dyeing wastewater and decolorizing agent technology, which is applied in textile industry wastewater treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of poor sedimentation effect and complicated production procedures, and achieve good sedimentation effect, simple production procedures, and decolorization Obvious effect

Inactive Publication Date: 2013-06-05
SHAOXING ENO ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the primary tasks of treating this type of wastewater is decolorization. In the current situation, the commonly used treatment agents are aluminum-ba

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0013] A preparation method of a coagulation decolorizer for the reuse and treatment of printing and dyeing wastewater, including the following steps:

[0014] a. Use one-step process to add formaldehyde, dicyandiamide, ammonium chloride, and aluminum chloride to the reaction kettle, stir to make the mixture uniform, and slowly heat;

[0015] b. When the above solution is heated to a temperature of 50-60°C, the natural reaction is carried out for 3-5 hours, and then the solution is heated to 80-90°C for 3 hours;

[0016] c. Cool to room temperature and put in barrels.

[0017] Further, a method for preparing a coagulation decolorizer for the reuse and treatment of printing and dyeing wastewater, characterized in that the weight of the formaldehyde is 15%-20%, and the weight of the dicyandiamide is 20%-40%, The weight part of the ammonium chloride is 10%-20%, and the weight part of the aluminum chloride is 10%-20%.

Example Embodiment

[0018] Example 1

[0019] Add 15% by weight of formaldehyde, 20% by weight of dicyandiamide, and 10% by weight of ammonium chloride into the reaction kettle, stir to mix uniformly, and slowly heat; the heating temperature of the solution reaches 50 At -60℃, after the natural reaction for 1-2 hours, continue to heat the solution to 90-100℃ and continue the reaction for 3 hours; when the temperature drops to 40-50℃, add 4‰ of urea by weight to the solution. After the reaction, add an anionic PAM solution with a concentration of 1‰ and let it stand for 24 hours. The filtered solution is an efficient coagulation decolorizer.

Example Embodiment

[0020] Example 2

[0021] Add 20% by weight of formaldehyde, 30% by weight of dicyandiamide, and 10% by weight of ammonium chloride into the reaction kettle, stir to mix uniformly, and slowly heat; the heating temperature of the solution reaches 50 At -60℃, after the natural reaction for 1-2 hours, continue to heat the solution to 90-100℃ and continue the reaction for 3 hours; when the temperature drops to 40-50℃, add 4‰ of urea by weight to the solution. After the reaction, add an anionic PAM solution with a concentration of 2‰ and let it stand for 24 hours. The filtered solution is an efficient coagulation decolorizer.

[0022] In the process of making the coagulation decolorizer, the weight of formaldehyde is controlled at 15%-25%, the weight of dicyandiamide is controlled at 20%-40%, and the weight of ammonium chloride is controlled at 10%-15%. The weight of urea is controlled at 0-5%, the weight of anionic PAM solution is controlled at 10%-15%, and the concentration of anioni...

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PUM

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Abstract

The invention relates to a preparation method of a coagulative decolorant for recycling dyeing wastewater, which comprises the following steps: a. by adopting a one-step process, adding formaldehyde, dicyandiamide, ammonium chloride and aluminum chloride into a reaction kettle, evenly mixing, and slowly heating; b. heating the solution to 50-60 DEG C, naturally reacting for 3-5 hours, continuing heating the solution to 80-90 DEG C, and continuing the reaction for 3 hours; and c. cooling to room temperature, and barreling. The coagulative decolorant has the advantages of favorable precipitation effect, obvious decolorizing effect and simple preparation procedure.

Description

technical field [0001] The invention relates to the treatment technology of printing and dyeing industrial waste water, and relates to a preparation method of a coagulation decolorizing agent for reuse treatment of printing and dyeing waste water. 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. Countries all over the world and our government 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, and synthetic fiber dyeing due to its economical dyeing process, high color fastness, chromatographic width, and bright color. However, with the development of production practice, the printing and dyeing technology of reactive dyes has exposed some new technical problems, mainly in the follo...

Claims

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Application Information

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IPC IPC(8): C02F1/54C02F103/30
Inventor 龚代高
Owner SHAOXING ENO ENVIRONMENTAL PROTECTION TECH
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