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Recycling process for printing and dyeing waste water

A printing and dyeing wastewater and process technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as environmental pollution, polluted environment, and failure to recycle and reuse wastewater , to achieve the effect of good treatment effect and low treatment cost

Inactive Publication Date: 2012-03-21
叶永祥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the treatment of printing and dyeing wastewater generally fails to meet the national discharge requirements, which will pollute the environment. Now the printing and dyeing factories are everywhere, which has indeed had a great impact on the environment, seriously polluting the environment in which people live, and even worse. To the purpose of waste water recycling and recycling

Method used

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  • Recycling process for printing and dyeing waste water
  • Recycling process for printing and dyeing waste water

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: As an embodiment of the printing and dyeing wastewater recycling process of the present invention, such as figure 1 It includes the following steps: (1) Suspension removal of COD in the wastewater in the suspension tank to reduce the COD concentration; (2) Press out the sludge in the wastewater through a filter press; (3) Treat the wastewater in the biochemical tank Wastewater is biochemically treated to reduce COD concentration; (4) Wastewater is filtered through a filter device, separated, and discharged into a clear water pool for recycling.

[0023] In this embodiment, the step (1) first adjusts the pH value of the waste water to 7.5 by adding soda ash, then presses air into the waste water in the suspension tank to turn the waste water up and down for aeration, and finally adds water to the waste water in the sedimentation tank. The drug is precipitated.

[0024] In this embodiment, the filtering device in the step (4) includes a security filter, a r...

Embodiment 2

[0026] Embodiment 2: As an embodiment of the printing and dyeing wastewater recycling process of the present invention, the difference from Embodiment 1 is that before the step (1), the high-concentration wastewater discharged from the printing and dyeing workshop is set to produce acid analysis after adjusting the pH value. The step (a) of reducing the COD concentration and separating and extracting the desizing agent; the COD value of the high-concentration wastewater in the step (a) is 22400, and the pH value is 12.79; the pH value of the wastewater is adjusted by adding sulfuric acid in the step (a) value to 1.8, at this time the COD value of the wastewater is 4640; the step (1) first adjusts the pH value of the wastewater to neutral by adding soda ash, and then presses air into the wastewater in the suspension tank to turn the wastewater up and down for aeration , and finally add medicine to the wastewater in the sedimentation tank for precipitation; the printing and dyein...

Embodiment 3

[0028] Embodiment 3: As an embodiment of the printing and dyeing wastewater recycling process of the present invention, the difference from Embodiment 2 is that: the COD of the wastewater is 24000, and the pH value is 13.5; in the step (a), the wastewater is adjusted by adding sulfuric acid The pH value of the wastewater reaches 2.1, and the COD value of the wastewater is 5040 at this time; the step (1) first adjusts the pH value of the wastewater to neutrality by adding soda ash; the printing and dyeing wastewater recycling process also includes directly using The waste water in between washes the reverse osmosis membrane and destroys the living conditions of bacteria.

[0029] In this embodiment, other steps and parameters are consistent with those in Embodiment 2, and will not be repeated here.

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Abstract

The invention relates to the technical field of sewage treatment, in particular to a recycling process for printing and dyeing waste water. The recycling process for printing and dyeing waste water includes firstly, performing COD (chemical oxygen demand) suspension removing of waste water in a suspension tank to reduce COD concentration, secondly, extruding sludge in the waste water by the aid of a filter press, thirdly, biochemically treating the waste water in a biochemical tank to reduce the COD concentration, and fourthly, filtering the waste water by the aid of a filtering device and discharging the water into a clean water tank for recycling after separation. The recycling process for printing and dyeing waste water is fine in treatment effect, safe, reliable and low in treatment cost.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a printing and dyeing wastewater recycling process. Background technique [0002] At present, the treatment of printing and dyeing wastewater generally fails to meet the national discharge requirements, which will pollute the environment. Now the printing and dyeing factories are everywhere, which has indeed had a great impact on the environment, seriously polluting the environment in which people live, and even worse. To the purpose of waste water recycling and recycling. Contents of the invention [0003] The invention provides a printing and dyeing wastewater recycling process with good treatment effect, safety and reliability, and low treatment cost. [0004] The present invention is achieved through the following technical solutions. [0005] The printing and dyeing wastewater recycling process is characterized in that it comprises the following steps: [0006]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 叶永祥
Owner 叶永祥
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