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Treatment method for realizing zero emission of printing and dyeing wastewater

A treatment method and technology for printing and dyeing wastewater, which are applied in the textile industry wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Large and other problems, to achieve the effect of reducing COD value, no secondary pollution, and ensuring service life

Active Publication Date: 2013-10-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a treatment method for realizing zero discharge of printing and dyeing wastewater, which solves the problems of large water consumption, high salt consumption and organic pollutant pollution of wastewater in the existing printing and dyeing process

Method used

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  • Treatment method for realizing zero emission of printing and dyeing wastewater
  • Treatment method for realizing zero emission of printing and dyeing wastewater
  • Treatment method for realizing zero emission of printing and dyeing wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The printing and dyeing wastewater of a printing and dyeing factory is treated as follows:

[0033] (1) Conventional treatment: Physicochemical, anaerobic and aerobic treatment of printing and dyeing wastewater stock solution;

[0034] (2) Advanced treatment: the conventionally treated effluent is subjected to ozone-aerated biological filter, sand filter, ultrafiltration and security filter;

[0035] (3) Membrane treatment: Reverse osmosis treatment is performed on the effluent after advanced treatment to obtain fresh water and concentrated water; the fresh water is directly reused for pigment dissolution, boiler supplementary water, general washing or circulating cooling water, and the concentrated water enters the next treatment process;

[0036] (4) Concentrated water treatment: Take the concentrated water and add it to the oxidation tank, then use hydrogen peroxide as the oxidant and ferrous sulfate as the catalyst to perform Fenton oxidation treatment on the concen...

Embodiment 2

[0049] The printing and dyeing wastewater of a printing and dyeing factory is treated as follows:

[0050] (1) Conventional treatment: Physicochemical, anaerobic and aerobic treatment of printing and dyeing wastewater stock solution;

[0051] (2) Advanced treatment: the conventionally treated effluent is subjected to ozone-aerated biological filter, sand filter, and security filter;

[0052] (3) Membrane treatment: Reverse osmosis treatment is performed on the effluent after advanced treatment to obtain fresh water and concentrated water; the fresh water is directly reused for pigment dissolution, boiler supplementary water, general washing or circulating cooling water, and the concentrated water enters the next treatment process;

[0053] (4) Concentrated water treatment: Take the concentrated water and add it to the oxidation tank, then use hydrogen peroxide as the oxidant and ferrous sulfate as the catalyst to perform Fenton oxidation treatment on the concentrated water, an...

Embodiment 3

[0066] The printing and dyeing wastewater of a printing and dyeing factory is treated as follows:

[0067] (1) Conventional treatment: Physicochemical, anaerobic and aerobic treatment of printing and dyeing wastewater stock solution;

[0068] (2) Advanced treatment: Chlorine disinfection, sand filtration and security filtration are carried out on the conventionally treated effluent;

[0069] (3) Membrane treatment: Reverse osmosis treatment is performed on the effluent after advanced treatment to obtain fresh water and concentrated water; the fresh water is directly reused for pigment dissolution, boiler supplementary water, general washing or circulating cooling water, and the concentrated water enters the next treatment process;

[0070] (4) Concentrated water treatment: Take the concentrated water and add it to the oxidation tank, then use hydrogen peroxide as the oxidant and ferrous sulfate as the catalyst to perform Fenton oxidation treatment on the concentrated water, an...

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Abstract

The invention discloses a treatment method for realizing zero emission of printing and dyeing wastewater. The treatment method comprises the following steps: performing physicochemical and biochemical treatments on printing and dyeing wastewater stoste; performing such advanced treatments on the discharged water as sand filtration, ultrafiltration and security filtration, and then, conveying the discharged water into a nanofiltration or reverse osmosis membrane treatment system to perform membrane treatment, thus obtaining fresh water and concentrated water through the membrane treatment, wherein the fresh water is low-COD and low-hardness ionized water and is used as process water to be directly recycled in dyeing procedure, boiler water addition, general washing or circulating cooling water. The concentrated water is high-salinity and high-hardness wastewater containing organic pollutants, the concentrated water is treated by a Fenton oxidation coupling lime soda method, the concentrated water becomes low-COD and low-hardness water with high salinity, and salt is directly added in the concentrated water according to dyeing process requirements so as to recycle the concentrated water in the dyeing procedure. The treatment method provided by the invention can be used for completely recycling the treated wastewater to realize zero emission of printing and dyeing enterprises and save the cost, and the treatment method is free of secondary pollution, thereby protecting the ecological environment and recycling the printing and dyeing wastewater.

Description

technical field [0001] The invention belongs to the field of printing and dyeing wastewater treatment, and in particular relates to a treatment method for realizing zero discharge of printing and dyeing wastewater. Background technique [0002] Textile printing and dyeing enterprises are one of the main pillar industries in my country, and textile printing and dyeing is the main process of textile enterprises. The environmental feature of the printing and dyeing industry is that it consumes a lot of water resources in production, so it produces a lot of difficult-to-treat printing and dyeing wastewater. [0003] Printing and dyeing wastewater has the characteristics of large volume of wastewater, high content of organic pollutants, high chroma and alkalinity, and large changes in water quality. The specific manifestations are: high chroma, which is red black or dark green from the senses, and the chroma is as high as tens of thousands of times; high salt content, the salt c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/30
Inventor 汪晓军袁延磊林旭龙崔家琪
Owner SOUTH CHINA UNIV OF TECH
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