Decoloring flocculant for treating soluble azo dye printing and dyeing wastewater and application method thereof

A technology of decolorizing flocculants and azo dyes, which is applied in textile industry wastewater treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of large floc particles, short alum flower formation time, complex process, etc., and achieve floc The effect of large particles, short alum flower formation time, and less dosage

Inactive Publication Date: 2012-05-23
CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of complex process, high cost and low decolorization efficiency, the present invention provides a flocculant with special decolorization function. The decolorization flocculant has simple process, easy-to-obtain raw materials, low cost and no secondary pollution , the formation time of alum flowers is short, the floc particles are large, the amount of flocculant is small, and the decolorization rate of soluble azo dye printing and dyeing wastewater is as high as 99.9%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The preparation steps of decolorizing flocculant of the present invention are:

[0024] (1) Take an inorganic polymer flocculant with a mass ratio of 50% to 80%, stir continuously in a beaker and heat for 5 to 10 minutes;

[0025] (2) Add sulfate with a mass ratio of 9% to 45% to it, and stir at a medium speed for 10 to 30 minutes;

[0026] (3) Add an accelerated sedimentation agent with a mass ratio of 0.1‰ to 0.5‰ to the above substances, stir, and let it stand for precipitation. After the insoluble substances in the inorganic polymer flocculant are completely precipitated, filter and take the supernatant;

[0027] (4) Add a surfactant with a mass ratio of 5% to 10% in the supernatant, and stir rapidly at 800r / min for 10 to 30 minutes until the surfactant is completely dissolved and an emulsion is formed;

[0028] (5) Dilute the emulsion 10 times with distilled water to obtain a clear and transparent light yellow liquid.

[0029] The inorganic polymer flocculant is ...

example 1

[0035] Based on the total mass percentage of the decolorizing flocculant, the decolorizing flocculant prepared by 50% of polyferric chloride, 45% of aluminum sulfate, 3% of cationic ammonium polyacrylate, and 2% of dodecylbenzenesulfonic acid is effective for certain clothing. The soluble azo dye wastewater in the factory is treated. The chromaticity of the azo dye wastewater is 5000. During the test, a transparent light yellow liquid with a mass ratio of 1.5‰ is added to the soluble azo dye printing and dyeing wastewater, and stirred for 20 minutes. During the stirring process, alum The flower formation time is short, the floc particles are large, the clear and transparent chroma is 1.7 after treatment, and the decolorization rate is 99.97%.

example 2

[0037] According to the total mass percentage of the decolorizing flocculant, the decolorizing flocculant prepared by polyaluminum ferric chloride 70%, iron sulfate 22%, polyepoxysuccinic acid 2.4%, and octadecyl ammonium bromide 5.6% is prepared. The soluble azo dye wastewater of a textile factory is treated. The chromaticity of the azo dye wastewater is 1000. During the test, a transparent light yellow liquid with a mass ratio of 1.1‰ was added to the soluble azo dye printing and dyeing wastewater, stirred for 25 minutes, and stirred During the process, the formation time of alum flowers is short, the floc particles are large, the clear and transparent chroma after treatment is 0.4, and the decolorization rate is 99.96%.

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Abstract

The invention discloses a decoloring flocculant for treating soluble azo dye printing and dyeing wastewater and an application method thereof. A preparation method for the decoloring flocculant comprises the following steps of: (1) continuously stirring 50-80% by weight of inorganic high molecular flocculant in a breaker and heating for 5-10min; (2) adding 9-45% by weight of sulfate into the breaker, stirring for 10-30min at medium speed; (3) adding 0.01-0.05% by weight of quick sinking agent into the above substances, stirring, standing, depositing, and taking supernatant; (4) adding 5-10% by weight of surfactant into the supernatant to form an emulsion; and (5) diluting the emulsion by 10 times via distilled water to obtain clear transparent light yellow liquid. The transparent light yellow liquid in percentage by weight of 0.1-0.2% is added into the bright red soluble azo dye printing and dyeing wastewater, and the wastewater is quickly stirred for 1-3min at a speed of 300r/min, stirred for 10-15min at a speed of 80r/min, stood and deposited to obtain the colorless transparent printing and dyeing wastewater as the yielding water.

Description

technical field [0001] The invention relates to a preparation method of a decolorizing flocculant for printing and dyeing wastewater, in particular to a preparation and application method of a decolorizing flocculant for treating printing and dyeing wastewater of soluble azo dyes, belonging to the field of printing and dyeing wastewater treatment. Background technique [0002] With the development of chemical fiber fabrics, the rise of imitation silk and the progress of printing and dyeing finishing technology, while the variety of dyes is increasing, the function is also developing in the direction of anti-photolysis, anti-oxidation, and anti-biological oxidation, so that soluble dyes The decolorization treatment of printing and dyeing wastewater is more difficult. Therefore, it is of great significance to study a flocculant with special decolorization function for the treatment of printing and dyeing wastewater of soluble azo dyes. [0003] At present, there are many meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F103/30
Inventor 雷春生雷思宇范璐璐
Owner CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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