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Method for purifying dye wastewater containing high-concentration cyanide

A technology for dye wastewater and cyanide, applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., to achieve low operating costs, simple process flow, and stable treatment effects

Inactive Publication Date: 2018-04-24
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of the cyanide purification method in the dye wastewater containing high concentration of cyanide, and propose a simple process flow, safe process operation, stable treatment effect, high pollutant removal rate, and no secondary pollution , Wastewater purification method with low operating cost

Method used

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Examples

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Effect test

specific example 1

[0042] A chemical company mainly produces and operates disperse dyes, solvent dyes and dye intermediates, etc. During the production process, a large amount of sodium cyanide needs to be added to improve the performance of the dyes, resulting in dye wastewater containing high concentrations of cyanide (hereinafter referred to as "wastewater") )1.5m 3 / h, the pollutants in wastewater are complex, mainly organic matter, halogen, cyanide, heavy metal, etc., the total cyanide concentration is 10000mg / L, the released cyanide concentration is nearly 10000mg / L, and the COD concentration is 60000mg / L. The total copper concentration was 350mg / L. The wastewater enters reactor one, reactor two, and reactor three in turn, and concentrated sulfuric acid is added to reactor one to adjust the pH value from 1.8 to 2.2. After adding concentrated sulfuric acid, the temperature of the wastewater rises to 45°C, and reactors one, The residence time of wastewater in reactor two and reactor three i...

specific example 2

[0044] A chemical company mainly produces and operates disperse dyes, solvent dyes and dye intermediates, etc. During the production process, a large amount of sodium cyanide needs to be added to improve the performance of the dyes, resulting in dye wastewater containing high concentrations of cyanide (hereinafter referred to as "wastewater") )1m 3 / h, the pollutants in wastewater are complex, mainly organic matter, halogen, cyanide, heavy metal, etc., among which the total cyanide concentration is 7000mg / L, the released cyanide concentration is nearly 7000mg / L, and the COD concentration is 50000mg / L. The total copper concentration was 300mg / L. The waste water enters reactor one, reactor two, and reactor three in turn, and concentrated sulfuric acid is added to reactor one to adjust the pH value from 2.0 to 2.5. After adding concentrated sulfuric acid, the temperature of waste water rises to 40°C, and reactor one, The residence time of wastewater in reactor 2 and reactor 3 is...

specific example 3

[0046] A dyestuff company mainly produces and operates disperse dyes, solvent dyes, and dye intermediates. During the production process, a large amount of sodium cyanide needs to be added, and at the same time, a certain amount of dye wastewater containing high-concentration cyanide (hereinafter referred to as "wastewater") 1 m 3 / h, the composition of pollutants in wastewater is complex, mainly organic matter, halide, cyanide, etc., the total cyanide concentration in wastewater is 15000mg / L, of which the concentration of easy-to-release cyanide is nearly 14500mg / L, and the concentration of COD is 80000mg / L L. The wastewater enters reactor one, reactor two, and reactor three in turn, and concentrated sulfuric acid is added to reactor one to adjust the pH value from 1.8 to 2.0. After adding concentrated sulfuric acid, the temperature of the wastewater rises to 42°C to 45°C, and the reaction The residence time of wastewater in reactor 1, reactor 2, and reactor 3 is 1.5h, and th...

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Abstract

The invention discloses a method for purifying dye wastewater containing high-concentration cyanide. According to the specific pollutants of dye wastewater containing high-concentration cyanide in theprinting and dyeing industry, i.e., cyanide and the like, an appropriate process route is chosen, a technical route of acidification, stripping and ozone oxidation is adopted, and thereby the objective of removing and recovering cyanide is achieved. As a cyanide purification technique, the method reduces the concentration of cyanide, so that highly poisonous dye wastewater becomes slightly poisonous, and thereby a foundation is laid for the subsequent biological treatment process. The method has the advantages of simple process flow, safe process operation, stable treatment effect, high pollutant removal rate, no secondary pollution and low operation cost. The invention solves the major environmental issue for the printing and dyeing industry, and also solves the problem of safety in theprocess of wastewater treatment, and environmental benefit, economic benefit and social benefit are remarkable.

Description

technical field [0001] The invention relates to the technical field of wastewater purification methods, in particular to a method for purifying dye wastewater containing high-concentration cyanide. Background technique [0002] Dye wastewater in the printing and dyeing industry contains a variety of pollutants, mainly including COD, BOD, SS, total cyanide, etc. At present, cyanide needs to be added in the processing and production of disperse dyes, solvent dyes and dye intermediates to improve the performance of dyes. Avoid the generation of dye wastewater containing high concentration of cyanide, which is difficult to treat, especially the wastewater has high concentration of cyanide, is highly toxic, has poor treatment safety, and is prone to safety accidents during the treatment process. At present, the treatment technologies for cyanide in dye wastewater in the printing and dyeing industry are mainly sodium thiosulfate method, sodium metabisulfite method, alkali chlorine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/18
CPCC02F9/00C02F1/20C02F1/78C02F1/66C02F2101/18C02F2301/08
Inventor 刘影张宇崔崇龙王莹
Owner CHANGCHUN GOLD RES INST
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