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Method for processing vinyl acetate-ethylene copolymerization emulsions wastewater

A technology of ethylene copolymer emulsion and vinyl acetate, which is applied in water/sewage multi-stage treatment, flotation water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problem of large dosage of coagulant and large amount of scum , Unsatisfactory treatment effect and other problems, to achieve stable and reliable treatment effect, simple operation, good social and economic benefits

Inactive Publication Date: 2009-08-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, in practical application, the coagulant and treatment process parameters of VAE emulsion wastewater are mostly referred to other emulsified wastewater treatment processes, and there are problems such as unsatisfactory treatment effect, large dosage of coagulant, and large amount of scum.

Method used

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  • Method for processing vinyl acetate-ethylene copolymerization emulsions wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this example, the COD of raw water is 3085 mg / L, the turbidity is 2635 NTU, and the pH value is 7.28. Under the condition of G value of 215s-1, add compound high-efficiency coagulant (see attached table 1) 125mg / L, add cationic polyacrylamide 1.5mg / l after 25s, and stir for 8min; control the air flotation device The air flotation pressure is 0.3MPa, and the reflux ratio is 50%. The mixing time of coagulation effluent and dissolved air water is 10min. The effluent water quality indicators are tested, and the COD is reduced to 55.28mg / L, and the turbidity is reduced to 6.0NTU. The equipment is running well and the effluent water quality is stable.

Embodiment 2

[0025] In this example, the COD of raw water is 3612 mg / L, the turbidity is 3210 NTU, and the pH value is 7.18. Under the condition that the G value is 215s-1, add 225mg / L of compound high-efficiency coagulant (see attached table 1 for the composition), add 2.5mg / l of cationic polyacrylamide after 30s, and stir for 8 minutes; control the air flotation device The air flotation pressure is 0.35MPa, and the reflux ratio is 50%. The mixing time of coagulation effluent and dissolved air water is 10min. The effluent water quality indicators are tested, and the COD is reduced to 55.30mg / L, and the turbidity is reduced to 5.5NTU. The equipment is running well and the effluent water quality is stable.

Embodiment 3

[0027] In this embodiment, the COD of the raw water is 4906 mg / L, the turbidity is 4510 NTU, and the pH value is 7.10. Under the condition of G value of 258s-1, add compound high-efficiency coagulant (see attached table 1) 300mg / L, add cationic polyacrylamide 3.2mg / l after 30s, and stir for 10min; control the air flotation device The air flotation pressure is 0.4MPa, and the reflux ratio is 50%. The mixing time of coagulation effluent and dissolved air water is 10min. The effluent water quality indicators are tested, and the COD is reduced to 55.36mg / L, and the turbidity is reduced to 6.5NTU. The equipment is running well and the effluent water quality is stable.

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Abstract

The invention belongs to the field of environmental protection. At present, the treatment of vinyl acetate-ethylene copolymer (VAE) emulsion wastewater mostly refers to other emulsified wastewater processes, and there are problems such as large dosage of coagulant and large amount of scum. The VAE emulsion wastewater first enters the coagulation and stirring device, and at the same time, high-efficiency coagulant is added. After coagulation for 20-30s, coagulation aid is added, and the velocity gradient value of 137-258s-1 is stirred for 6-10min before entering the air flotation tank; Under the pressure of 0.3-0.4MPa, the liquid mixing pump sucks backflow water and air to produce dissolved air water in the range of 40%-50% reflux ratio; waste water and dissolved air water enter the air flotation tank to mix at the same time, and carry out 5-10min co-polymerization Floating; high-efficiency coagulant weight percentage is: ferric chloride 80-90%, sodium sulfate 3-8%, potassium sulfate 2-6%, sodium tetraborate 0-5%, iron sulfate 2-8%, dubbed 40-50g / L aqueous solution is added; the coagulant aid is cationic polyacrylamide, and the dosage ratio of high-efficiency coagulant is controlled at 1:125-1:80. The effluent of the invention reaches the first-level discharge standard required in GB 8978-1996, the effect is stable and efficient, and the treatment cost is low.

Description

technical field [0001] The invention belongs to the field of environmental protection, in particular to a treatment method for vinyl acetate-ethylene copolymer emulsion wastewater. Background technique [0002] Vinyl Acetate-Ethylene Copolymer Emulsion (Vinyl Acetate-Ethylene Copolymer Emulsion) is called VAE emulsion for short, and the content of vinyl acetate in the copolymer is generally between 70% and 95% (wt). VAE emulsion is a water-based adhesive that uses water as the dispersion medium, has no health hazards, is an environmentally friendly adhesive, and is widely used in adhesives, coatings, fabric processing, paper processing, construction and other fields. Today, with increasing emphasis on environmental protection, water-based VAE emulsions are becoming more and more popular. The output of VAE emulsions is increasing at a rate of 20% per year. However, in the production process of VAE emulsions, storage tanks, pipelines, Equipment, etc. will inevitably stick to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/02C02F1/52C02F1/24
Inventor 杨艳玲方克华李星彭永臻李圭白
Owner BEIJING UNIV OF TECH
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