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Method for catching dye in dyeing wastewater by taking organic acid as additive

A technology for dyeing wastewater and organic acids, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of low safety, limited number of cycles, high cost, etc., and achieve low consumption and high capture efficiency High, easy-to-operate effect

Active Publication Date: 2016-07-13
ZHEJIANG SILK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But careful study finds that there are following problems: the one, this method needs to add concentrated sulfuric acid every time dyestuff in dyeing wastewater is caught, and safety is lower; The content gradually increases, and if the dyeing wastewater is recycled for dyeing, the number of cycles is limited
However, the current existing technology is costly, and the inorganic salts generated after treatment remain in the water, which will affect the subsequent reuse of wastewater

Method used

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  • Method for catching dye in dyeing wastewater by taking organic acid as additive
  • Method for catching dye in dyeing wastewater by taking organic acid as additive
  • Method for catching dye in dyeing wastewater by taking organic acid as additive

Examples

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Effect test

Embodiment 1

[0029] A kind of method that this embodiment provides uses organic acid as additive to capture the dyestuff in dyeing wastewater, comprises the following steps:

[0030] 1) Choose reactive black ED-H to dye according to conventional prescription and process. Then collect the staining residue to be captured, and dilute the residue 30 times to test its optical density value;

[0031] 2) Take 50mL of the dyeing residue, and add dodecylbenzenesulfonic acid to it, and the concentration is 0.05g / L, then stir evenly, then add an equal volume of capture base, and stir the mixed system for 10min while heating, Among them, the temperature should not exceed 60°C, and then stand for stratification;

[0032] 3) Observing the stratification phenomenon, separating the aqueous phase to measure the optical density value (diluted 30 times) and the TDS value (diluted 100 times) after the neutralization of the aqueous phase, and calculating the capture efficiency and the salt content of the aque...

Embodiment 2

[0035] A kind of method that this embodiment provides uses organic acid as additive to capture the dyestuff in dyeing wastewater, comprises the following steps:

[0036] 1) Choose reactive black ED-H to dye according to conventional prescription and process. Then collect the staining residue to be captured, and dilute the residue 30 times to test its optical density value;

[0037] 2) Take 50mL of the dyeing residue, and add octadecylbenzenesulfonic acid to it at a concentration of 1.0g / L, then stir evenly, then add an equal volume of capture base, and stir the mixed system for 10min while heating, wherein Stirring temperature should not exceed 60°C, and then stand to separate layers;

[0038] 3) Observing the stratification phenomenon, separating the aqueous phase to measure the optical density value (diluted 30 times) and TDS value (diluted 100 times), and calculating the capture efficiency and the salt content of the aqueous phase, respectively. The test results are shown...

Embodiment 3

[0041] A kind of method that this embodiment provides uses organic acid as additive to capture the dyestuff in dyeing wastewater, comprises the following steps:

[0042] 1) Choose reactive black ED-H to dye according to conventional prescription and process. Then collect the staining residue to be captured, and dilute the residue 30 times to test its optical density value;

[0043] 2) Take 50mL of the dyeing residue, and add tetradecylbenzenesulfonic acid to it at a concentration of 10g / L, then stir evenly, then add an equal volume of capture base, and stir the mixed system for 10min while heating, during which The temperature should not exceed 60°C, and then stand for stratification;

[0044] 3) Observing the stratification phenomenon, separating the aqueous phase to measure the optical density value (diluted 30 times) and the TDS value (diluted 100 times) after the neutralization of the aqueous phase, and calculating the capture efficiency and the salt content of the aqueou...

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Abstract

The invention discloses a method for catching dye in dyeing wastewater by taking organic acid as an additive.By adoption of the organic acid, on the one hand, pH value of the dyeing wastewater is decreased, and remnant dyes in the dyeing wastewater are caught by catching radicals under acidic conditions; on the other hand, the organic acid can partially stay in the catching radicals, and consequently consumption of the organic acid for next catching can be reduced while increase of content of inorganic salts in a water phase is avoided after catching.The organic acid consumption is 0.01-10g / L, and whether a catching effect is excellent or not is determined according to a catching rate of the remnant dyes and a water phase TDS (total dissolved solids) value (namely concentration of total dissolved solids) after catching.The method avoids the defect of increase of the inorganic salts after catching and has the advantages of low consumption, excellent catching effects and the like.

Description

【Technical field】 [0001] The invention relates to a method for capturing dyes in dyeing wastewater by using organic acids as additives, specifically a method for capturing dyeing wastewater of reactive dyes by using octadecylbenzenesulfonic acid as an additive instead of inorganic acids, belonging to the field of energy saving and emission reduction in the printing and dyeing industry . 【Background technique】 [0002] The printing and dyeing industry is a large discharge of industrial wastewater. According to relevant statistics, the country discharges more than 3 million tons of printing and dyeing wastewater every day. With the increasingly stringent discharge standards and the rising water and sewage discharge fees, the social environment and production enterprises are facing more and more serious problems. The pressure of printing and dyeing wastewater reuse has attracted more and more attention. As early as the 1980s and 1990s, most of the United States and Europe used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58
CPCC02F1/58C02F2101/308
Inventor 刘晓芸姚庆才陈小利孙思恒
Owner ZHEJIANG SILK TECH
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