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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
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  • 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-based and iron-based coagulants, and most of them are mixed with PAC and PAM. However, the precipitation effect is not good and the production process is complicated.

Method used

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preparation example Construction

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

[0014] a. Add formaldehyde, dicyandiamide, ammonium chloride and aluminum chloride into the reaction kettle by one-step process, stir to mix evenly, and heat slowly;

[0015] b. When the above solution is heated until the temperature reaches 50-60°C, after a natural reaction for 3-5 hours, continue to heat the solution to 80-90°C, and continue the reaction for 3 hours;

[0016] c. Cool to room temperature and pack into barrels.

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

Embodiment 1

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

Embodiment 2

[0021] In the reactor, add formaldehyde that is 20% by weight, dicyandiamide that is 30% by weight, and ammonium chloride that is 10% by weight, stir to make it mix evenly, and slowly heat; the heating temperature of the solution reaches 50 At -60°C, after a natural reaction for 1-2 hours, continue to heat the solution to 90-100°C and continue the reaction for 3 hours; when the temperature drops to 40-50°C, add urea with a weight of 4‰ to the solution After the reaction, add an anionic PAM solution with a concentration of 2‰, let it stand for 24 hours, and the filtered solution is a high-efficiency coagulation and decolorization agent.

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

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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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