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Method for treating dye wastewater by utilizing dye intermediate effluent

A dye intermediate and dye wastewater technology, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of ineffective utilization and increased dye wastewater treatment cost, etc. To achieve the effect of saving resources, saving costs and reducing environmental pollution

Active Publication Date: 2014-01-29
ZHEJIANG DIBANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of commercially available flocculants greatly increases the cost of dye wastewater treatment
[0005] N-cyanoethylaniline or N, N-dicyanoethylaniline is a kind of important dyestuff intermediate, when adopting acrylonitrile as cyanoethylation reagent, aluminum chloride is catalyst , N-dicyanoethylaniline, the post-treatment process will produce a large amount of waste liquid containing aluminum trichloride. At present, these waste liquids are generally discharged into the sewage mixing tank together with other intermediate waste liquids. use efficiently

Method used

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  • Method for treating dye wastewater by utilizing dye intermediate effluent
  • Method for treating dye wastewater by utilizing dye intermediate effluent

Examples

Experimental program
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Effect test

Embodiment 1

[0023] In the 2000mL beaker, add 1000g COD to be 21280mg / L, chromaticity is the washing waste water of disperse violet 93 dyestuff of 675 times, start stirring, add 80g N-cyanoethylation waste liquid (aluminum chloride content is 10%, for preparation The waste liquid produced in the N-cyanoethylaniline process), stirred at room temperature for 20 minutes, added calcium carbide to adjust the pH value to 10.5, continued to stir for 20 minutes, poured into the vacuum filtration pump for suction filtration, and obtained a light yellow transparent filtrate (pre- treatment liquid), the measured COD is 6250mg / L, the chroma is 153 times, the COD removal rate is 70.63%, and the chroma removal rate is 77.33%.

[0024] like figure 1 As shown, the pretreatment liquid obtained in this embodiment can reach the discharge standard through subsequent oxidation treatment, treatment in the aeration tank and biochemical oxidation treatment.

Embodiment 2

[0026] Add 1000g COD in the 2000mL beaker and be 20630mg / L, chromaticity is the washing waste water of 590 times of disperse orange 288 dyestuffs, start stirring, add 110g N, N-dicyanoethylated waste liquid (aluminum chloride content is 12% , for the waste liquid produced in the process of preparing N,N-dicyanoethylaniline), stirred at room temperature for 20 minutes, added calcium carbide to adjust the pH value to 11.3, continued to stir for 20 minutes, poured into a vacuum filter pump for suction filtration, and obtained Light yellow transparent filtrate, the measured COD is 5590mg / L, the chroma is 125 times, the COD removal rate is 72.90%, and the chroma removal rate is 78.81%. It is directly discharged into the subsequent oxidation tank, aeration tank and biochemical tank for further processing Routine treatment, discharge after reaching the standard.

Embodiment 3

[0028] Adding 1000g COD in the 2000mL beaker is 23600mg / L, chroma is 625 times coupling pot cleaning waste water (color is red), starts stirring, adds 140g N-cyanoethylation waste liquid (aluminum chloride content is 10%, In order to prepare the waste liquid produced in the process of N-ethyl-N-cyanoethylaniline), stir at room temperature for 20 minutes, add calcium carbide to adjust the pH value to 10.8, continue stirring for 20 minutes, and pour it into a vacuum filter pump for suction filtration. Obtain light yellow transparent filtrate, the measured COD is 5630mg / L, the chroma is 116 times, the COD removal rate is 76.14%, the chroma removal rate is 81.44%, and it is directly discharged into the subsequent oxidation tank, aeration tank, biochemical tank Carry out routine treatment and discharge after reaching the standard.

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Abstract

The invention discloses a method for treating dye wastewater by utilizing dye intermediate effluent. The method comprises the following steps of: (1) uniformly mixing the dye wastewater and cyanoethyl effluent containing aluminum ions, wherein the volume of the added cyanoethyl effluent is 5 to 30 percent of that of the dye wastewater; (2) adding a pH regulator into the mixed solution, regulating the pH value of the mixed solution to 9 to 12, uniformly stirring, and carrying out suction filtering to obtain a pretreatment solution; and (3) further treating the pretreatment solution to reach the standard for emission. The pretreatment method is particularly suitable for dye production factories or printing and dyeing mills in which lots of dye intermediate effluent containing aluminum chloride and lots of high chemical oxygen demand (COD) high-chroma printing and dyeing wastewater can be generated; when the effluent containing aluminum ion is used for treating high-COD high-chroma printing and dyeing wastewater, the aims of saving resources, treating wastes with processes of wastes against one another and comprehensively utilizing the waste are fulfilled, the cost is greatly saved for subsequent treatment of wastewater in the dye production factories or printing and dyeing mills, and the environmental pollution is further reduced.

Description

technical field [0001] The invention relates to a method for treating dye wastewater, in particular to a method for treating dye wastewater with high COD and high chroma by using waste liquid of dye intermediates. Background technique [0002] The wastewater from dye production plants has always been one of the difficulties in the treatment of industrial wastewater at home and abroad. This is because dye wastewater has complex components, large water volume, high content of organic pollutants, high chroma, high toxicity, and a wide range of water quality changes. It is a refractory wastewater. . At present, the main methods used for the treatment of dye wastewater include physical treatment, chemical treatment, physical chemical treatment, biological treatment and a combination of several processes. Chemical treatment is divided into chemical precipitation, coagulation, and neutralization. And method, redox (including electrolysis) method, etc. Among the many dye wastewate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 徐万福唐智勇傅伟松刘伟陈华祥
Owner ZHEJIANG DIBANG CHEM