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Method for treating dye waste water by using alkylation waste water

A technology for the treatment of dye wastewater and wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of poor biodegradability, complex components, and high COD, and The effect of saving costs, reducing environmental pollution and saving resources

Inactive Publication Date: 2010-06-16
浙江龙盛染料化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The wastewater from dyeing and chemical factories is currently recognized as one of the most difficult industrial wastewater to treat. This is because the dye wastewater not only contains a small amount of unreacted chemical raw materials and intermediates, but also a small amount of dyes and a large amount of waste acid. It has the following treatment Difficulties: 1. High COD, low BOD / COD value, poor biodegradability; 2. High chroma, and complex components
The removal of COD is related to decolorization, but the problem of decolorization is more difficult

Method used

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  • Method for treating dye waste water by using alkylation waste water

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Comparison scheme
Effect test

Embodiment 1

[0018] Take 1LCOD as 53400 (O 2 , mg / L) of the filter cake (can be the filter cake of any dye in the dyeing and chemical plant, in the present embodiment is the filter cake of Disperse Orange 96# dye) the waste water after washing is put into a large glass beaker, and 100mL of methanediol is added The wastewater discharged from the ethyl workshop (its magnesium ion concentration is 30g / L), after stirring at room temperature for 15 minutes, add calcium carbide slag to adjust the pH value to 10, continue to stir at room temperature for 15 minutes, put it into a vacuum filter pump for suction filtration, and obtain light yellow Transparent filtrate, measured COD is 5200 (O 2 , mg / L), the COD removal rate was 90.26%, and then the filtrate was poured into the aeration tank, and the conventional treatment of wastewater was carried out by biochemical oxidation.

Embodiment 2

[0020] Take 1LCOD as 51400 (O 2 , mg / L) waste water (color is brown) after cleaning the coupling reaction pot is put into a large glass beaker, add 80mL of waste water discharged from the m-diethyl workshop (its magnesium ion concentration is 26g / L), and stir at room temperature for 15min Finally, add calcium carbide slag to adjust the pH value to 12, continue to stir at room temperature for 15 minutes, put it into a vacuum filter pump for suction filtration, concentrate and send the filter cake to the incineration site for treatment after accumulation, the filtrate is light yellow, and the measured COD is 4900 (O 2 , mg / L), the COD removal rate was 90.47%, and then the filtrate was poured into the aeration tank, and the conventional treatment of wastewater was carried out by biochemical oxidation.

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Abstract

The invention provides a method which uses the mother liquid wastewater in alkylated production to treat high COD dye wastewater. The method manages waste by waste and takes the mother liquid wastewater in alkylated production, especially the chloroethane as an alkylated reagent, and also takes magnesium oxide or magnesium hydroxide or magnesium carbonate as an acid acceptor to prepare the wastewater of m-Acetamino-N, N-diacetoxyethylaniline and carry through pretreatment to the high COD and concentration dye wastewater to reduce the COD value, followed by the conventional wastewater treatment. The technology of the invention is particularly applicable to dyehouses and dye production plants which can either produce the wastewater containing magnesium chloride, magnesium sulfate and other magnesium ions, or produce a large amount of high-COD and high-color printing and dyeing wastewater; when the wastewater containing magnesium ions is used to treat the high-COD and high-color printingand dyeing wastewater, the purposes of saving resources, managing waste by waste, as well as comprehensive utilization are achieved so as to greatly reduce the follow-up treatment for the wastewater of the dyehouses and further reduce the environmental pollution.

Description

(1) Technical field [0001] The invention relates to a method for treating waste with waste, in particular to a method for treating high-COD and high-concentration dye wastewater by using alkylation waste liquid (ie, mother liquid wastewater in the alkylation process). (2) Background technology [0002] The wastewater from dyeing and chemical factories is currently recognized as one of the most difficult industrial wastewater to treat. This is because the dye wastewater not only contains a small amount of unreacted chemical raw materials and intermediates, but also a small amount of dyes and a large amount of waste acid. It has the following treatment Difficulties: 1. High COD, low BOD / COD value, poor biodegradability; 2. High chroma, and complex components. The removal of COD is related to decolorization, but the problem of decolorization is more difficult. In terms of exploring the harmless treatment process of printing and dyeing wastewater, there have been many literatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/52
Inventor 高怀庆钟玉霞钟利峰韩伟
Owner 浙江龙盛染料化工有限公司