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Treatment process of dicyanogen wastewater generated during production of disperse blue 60

A technology of production process and treatment process, applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, water pollutants, etc. simple effect

Active Publication Date: 2015-12-02
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] At present, there are many studies on catalytic wet oxidation method, most of which are used in pesticide wastewater, pharmaceutical wastewater and other fields. However, for cyanide wastewater that is relatively difficult to oxidize and decompose, there are few reports on wet oxidation method treatment.

Method used

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  • Treatment process of dicyanogen wastewater generated during production of disperse blue 60
  • Treatment process of dicyanogen wastewater generated during production of disperse blue 60
  • Treatment process of dicyanogen wastewater generated during production of disperse blue 60

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The dicyanide wastewater produced in the production process of Disperse Blue 60, after analysis, the pH value of the raw water is 9.5, the COD is 33260mg / L, and the salt content is 7% (based on the quality of the dicyanide wastewater).

[0059] (1) Wet oxidation: Under the conditions of pH value of 8, temperature of 260°C, pressure of 7Mpa, and air oxidation, the dicyanide wastewater in the production process of Disperse Blue 60 is wet-oxidized, and the oxidation time is 150min. After cooling down, Filtration to obtain filtrate I.

[0060] The effluent after the wet oxidation reaction is brown-black, pH=8.4, COD=4665mg / L, ammonia nitrogen is 2380mg / L; COD removal rate is 86%.

[0061] (2) blow off once: add calcium oxide in filtrate I, adjust pH to 10, take the quality of filtrate I as a benchmark, add 0.1% waste activated carbon, stir 30min, filter; The filtrate (wine red) obtained is heated and Keep warm at 70°C, aerate with air for 1 hour, and the flow rate of the a...

Embodiment 2

[0073] The dicyanide wastewater produced in the production process of Disperse Blue 60, after analysis, the pH value of the raw water is 9.5, the COD is 33260mg / L, and the salt content is 7% (based on the quality of the dicyanide wastewater).

[0074] (1) Wet oxidation: under the conditions that the pH value is 9.5, the temperature is 260°C, the pressure is 5MPa, and 0.5% copper sulfate is the catalyst (based on the quality of dicyanide wastewater), the dicyandioxide in the production process of disperse blue 60 is The cyanide wastewater was subjected to wet oxidation, and the oxidation time was 70 minutes. After cooling down, it was filtered to obtain filtrate I.

[0075] The effluent after the wet oxidation reaction is turbid brown, the effluent pH=7, the COD is 6000mg / L, the ammonia nitrogen is 2600mg / L; the COD removal rate is 81%.

[0076] (2) copper removal: take the quality of filtrate I as a benchmark, add 0.5% sodium sulfide nonahydrate (Na 2 S·9H 2 O), 0.05% activa...

Embodiment 3

[0093] Adopt the dicyanide waste water identical with embodiment 2 to handle.

[0094] Ozone decolorization is not carried out in step (4) of the present embodiment, the wastewater is directly adjusted to a pH of 6, 0.3% activated carbon is added, stirred and adsorbed for 30min, the COD obtained by filtration of the filtrate is 2500mg / L, and the ammonia nitrogen content is 21mg / L.

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Abstract

The invention discloses a treatment process of dicyanogen wastewater generated during production of disperse blue 60. The process includes the steps of at 220-300 DEG C and under a pressure of 2-10Mpa, subjecting the dicyanogen wastewater occurring during the production of the disperse blue 60 is subjected to wet oxidation and filtering to obtain filtrate I; removing ammonia nitrogen by means of a blow-off method or a magnesium ammonium phosphate precipitation method so as to obtain filtrate II; under alkaline condition, performing ozonation discoloration and / or adsorption decoloring as well as filtering to obtain filtrate III; adjusting pH of the filtrate III to 4-9, performing concentrating, collecting condensate and concentrate, directly discharging the condensate, and subjecting the concentrate to crystallization separation to obtain a salt. The dicyanogen wastewater is treated, by means of wet oxidation, ammonia nitrogen removal, oxidization discoloring and concentration crystallization, residual cyanide and DMF (dimethylformamide) in the wastewater are effectively decomposed, and COD (chemical oxygen demand) and chromaticity of the wastewater are decreased.

Description

technical field [0001] The invention relates to the technical field of dye wastewater treatment, in particular to a process for treating dicyanide wastewater in the production process of disperse blue 60. Background technique [0002] Dye wastewater occupies a large proportion of the total industrial wastewater in my country, and it is difficult to treat due to its characteristics of strong alkalinity, high chroma, high concentration of organic matter, complex components, and poor biodegradability. Therefore, for dye wastewater treatment Research on methods and techniques is of great significance. [0003] In existing studies, various methods are used to treat the above wastewater, such as physical methods, chemical methods and biological methods. The patent application document with publication number CN101519249A discloses a treatment and recycling method of hydrolyzed wastewater in the production process of disperse blue. The removal rate of 2,4-dinitrophenol in the hydr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/18
Inventor 张云保钟芳华徐雷金孔令鸟
Owner ZHEJIANG QICAI ECO TECH CO LTD
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