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Regeneration treatment and cyclic utilization method of printing and dyeing wastewater

A printing and dyeing sewage and treatment cycle technology, which is applied in the field of resource recycling and sewage treatment, can solve the problems of high operating costs in the ozone catalytic oxidation process, achieve the effects of reducing floor space and investment costs, reducing operating pressure, and improving effects

Inactive Publication Date: 2008-06-25
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the operating cost of the ozone catalytic oxidation link of this technology is relatively high

Method used

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  • Regeneration treatment and cyclic utilization method of printing and dyeing wastewater

Examples

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Effect test

Embodiment 1

[0032] Embodiment 1: Take the continuous test of the present invention in a branch of a certain large-scale printing and dyeing enterprise as an example to further illustrate.

[0033] The enterprise discharges 3,000 tons of printing and dyeing sewage every day during the production process. The quality of the sewage is: chemical oxygen demand 1500-2500mg / L, chromaticity 800-1200 times, pH value 9-14, conductivity 4000-6000μs / cm.

[0034] After a small sample test in the early stage, it was decided to use ferrous sulfate as a coagulant to control the pH of the sewage to 10. The specific process is as follows (Figure 1):

[0035] (1) Adjust pH value: Online real-time detection and automatic addition of acid or alkali to adjust the pH value of mixed printing and dyeing wastewater to 10.

[0036] (2) Coagulation and sedimentation: Add coagulant ferrous sulfate to the sewage in an amount of 900mg / L, stir and react, and settle by gravity.

[0037] (3) Mechanical filtration: The su...

Embodiment 2

[0045] Embodiment 2: Take the engineering application of the present invention in a new printing and dyeing enterprise as an example to further illustrate.

[0046] The enterprise discharges 3,000 tons of printing and dyeing sewage every day during the production process. The quality of the sewage is: chemical oxygen demand 500-700mg / L, chromaticity 600-1000 times, pH value 8-12, conductivity 3000-6000μs / cm.

[0047] After a small sample test in the early stage, it was decided to use ferrous sulfate as the coagulant and polyacrylamide (PAM) as the coagulant aid to control the pH of the sewage to 10. The specific process is as follows (Figure 2):

[0048] (1) Adjust pH value: Online real-time detection and automatic addition of acid or alkali to adjust the pH value of mixed printing and dyeing wastewater to 10.

[0049] (2) Coagulation and sedimentation: Add the coagulant ferrous sulfate in the amount of 800mg / L to the sewage, add the coagulant polyacrylamide (PAM) in the amoun...

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Abstract

The invention relates to a method for reproducing, treating, cycle using dyeing sewage, which is characterized in that the method comprises that: (1) adjustment of pH value: the pH value of the mixed dyeing sewage is on-line real-time detected and adjusted by automatically adding acid or alkali to a best pH value corresponding to adopted coagulant; (2) coagulation sedimentation: the coagulant is added to stirring reaction and gravity sedimentation; (3) mechanical filtration: supernatant is filtered by the mechanism to remove a little plurality of suspended particles in the water; (4) fine filtration: by adopting security filter, residual micro particles are caught; (5) reserve osmosis membrane separation: by using the reserve osmosis membrane to carry out membrane separation, output clear water is cycled for use; (6) biological treatment: by adopting the biological treatment to membrane separate concentrated sewage, organic pollutants in the sewage are removed; (7) secondary coagulation sedimentation: bio-chemical effluent adding with the coagulant is reacted and precipitated again, and discharged after reaching the national first class discharge standard.The biological treatment and the secondary coagulation sedimentation can be replaced by sewage treatment plant for centralized treatment.The method is characterized by small occupied area, little investment and low operating cost.

Description

technical field [0001] The invention relates to the technical field of sewage treatment and resource recycling, in particular to a method for regeneration, treatment and recycling of printing and dyeing sewage. Background technique [0002] my country is the world's largest exporter of textile products. The average annual growth rate of the textile industry exceeds 10%. In 2005, the sales revenue of textile enterprises above designated size reached 2.64 trillion yuan, and the number of employees exceeded 19.6 million. Adding the 100 million employees in raw material origin (cotton, wool, and hemp production), a total of about 120 million, which plays a very important role in national development and social stability. [0003] However, the textile printing and dyeing industry is one of the industries that consume a lot of water resources and discharge a lot of pollutants. The annual wastewater discharge of my country's textile printing and dyeing industry exceeds 1.3 billio...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/66C02F1/52C02F1/44C02F103/30
Inventor 周宇松逯庆国吴敏郭红燕谭锁奎沈博侃
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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