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Process for treating printing and dyeing wastewater containing reactive dyes in advance

A technology for printing and dyeing wastewater and reactive dyes, applied in the field of water treatment, can solve the problems of difficult decolorization treatment, poor biodegradability, poor treatment effect, etc., and achieve the effect of simple operation, high removal rate and improved effect

Active Publication Date: 2016-02-03
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of its characteristics of large water volume, deep color, complex components, poor biodegradability, and difficult decolorization treatment, the traditional water treatment process has poor treatment effect on these wastewater containing reactive dyes.

Method used

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  • Process for treating printing and dyeing wastewater containing reactive dyes in advance
  • Process for treating printing and dyeing wastewater containing reactive dyes in advance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] For the treatment of wastewater from an active printing and dyeing factory in Guangdong, the treatment process is as follows:

[0025] (1) Plate heat exchanger

[0026] The printing and dyeing wastewater containing reactive dyes first enters the plate heat exchanger for cooling, and the circulating cooling water of the plate heat exchanger is industrial water;

[0027] (2) Coagulation sedimentation tank

[0028] The printing and dyeing wastewater of reactive dyes is cooled by the plate heat exchanger and then enters the coagulation sedimentation tank. Add 200mg / L basic aluminum chloride and 2mg / L anionic polyacrylamide to the coagulation tank one by one, mix the chemicals with printing and dyeing wastewater containing reactive dyes, and enter the multi-channel folding plate coagulation tank with a hydraulic retention time of 15 minutes;

[0029] (3) Secondary pH adjustment pool

[0030] The printing and dyeing wastewater containing reactive dyes passes through the co...

Embodiment 2

[0037] The treatment process of wastewater from an active printing and dyeing factory in Zhejiang is as follows:

[0038] (1) Plate heat exchanger

[0039] The printing and dyeing wastewater containing reactive dyes first enters the plate heat exchanger for cooling, and the circulating cooling water of the plate heat exchanger is industrial water;

[0040] (2) Coagulation sedimentation tank

[0041] The printing and dyeing wastewater containing reactive dyes is cooled by a plate heat exchanger and then enters the coagulation sedimentation tank. Add 300mg / L basic aluminum chloride and 2.5mg / L anionic polyacrylamide to the coagulation tank one by one. After mixing the chemicals and printing and dyeing wastewater containing reactive dyes, they enter the multi-channel folding plate coagulation tank, and the hydraulic retention time is 10 minutes;

[0042] (3) Secondary pH adjustment pool

[0043]The printing and dyeing wastewater containing reactive dyes passes through the coag...

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Abstract

The invention discloses a process for treating printing and dyeing wastewater containing reactive dyes in advance, which obviously improves effect of coagulation precipitation by finely adjusting temperature and pH (potential of hydrogen) based on traditional treatment of printing and dyeing wastewater, is catalyzed and oxidized to further degrade dyes through ozone, greatly improves removal rate of chemical oxygen demand (COD) and chromaticity through physical and chemical double reinforcement, is less in pharmaceutical dosage, is high in treatment efficiency of printing and dyeing wastewater of reactive dyes, achieves removal rate of COD above 80%, and can achieve decolourization ratio above 90%. A reactive dye wastewater advanced treatment system is steady in treatment effect, low in production and operation cost, simple and convenient in operation and high in degree of automation.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to an advanced treatment process for printing and dyeing wastewater containing reactive dyes. Background technique [0002] With the rapid development of my country's printing and dyeing industry, a series of environmental problems have also emerged, one of which is the generation of a large amount of printing and dyeing wastewater. Since the whole process of dyeing and finishing requires a large amount of water for transportation, washing, dispersing materials and cooling equipment, etc., the amount of wastewater generated is large, generally reaching 70% to 90% of the water consumption of printing and dyeing enterprises. According to relevant data, about 30% of the discharge of chemical oxygen demand (CODcr) in industrial wastewater in the Taihu Lake Basin comes from the textile printing and dyeing industry. Especially in recent years, with the implementation of reactive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04B01J29/76C02F103/30
Inventor 何丹农童琴董亚梅吴晓燕尹桂林金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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