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Pretreatment method for neutralizing printing and dyeing waste water by using recovered carbon dioxide instead of waste acid

A technology for carbon dioxide, printing and dyeing wastewater, applied in neutralizing water/sewage treatment, chemical instruments and methods, textile industry wastewater treatment, etc., can solve the problems of sulfur poisoning biochemical treatment efficiency reduction, etc. The effect of carbon emissions

Inactive Publication Date: 2018-09-18
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: the present invention provides a pretreatment method that utilizes recovered carbon dioxide instead of waste acid to neutralize printing and dyeing wastewater, which solves the problem of excessive acidification and high-concentration sulfuric acid caused by the use of waste acid (sulfuric acid) for neutralization of printing and dyeing wastewater. Sulfur poisoning caused by root ions and serious reduction in biochemical treatment efficiency

Method used

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  • Pretreatment method for neutralizing printing and dyeing waste water by using recovered carbon dioxide instead of waste acid
  • Pretreatment method for neutralizing printing and dyeing waste water by using recovered carbon dioxide instead of waste acid

Examples

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Embodiment 1

[0022] A pretreatment method for neutralizing printing and dyeing wastewater by using recycled carbon dioxide instead of waste acid:

[0023] 1) Store the carbon dioxide recovered from the waste gas in the industrial park and liquefied and purified in the carbon dioxide storage tank;

[0024] 2) After the liquid carbon dioxide is vaporized by the vaporizer, it is decompressed to 450Mpa by the pressure reducing valve, and then it is fed into the tubular mixer by the automatic control dosing system. The ventilation volume is controlled at 1L / (L min), and the outlet pressure is controlled at 3.5kg / cm 2 , the automatic control dosing system sets the pH value control to 7.5;

[0025] 3) The printing and dyeing wastewater is uniformly mixed with carbon dioxide in the tubular mixer after being regulated by the regulating tank;

[0026] 4) The printing and dyeing wastewater passes through the tubular mixer and then enters the mixing pool, so that the wastewater and carbon dioxide are...

Embodiment 2

[0028] A pretreatment method for neutralizing printing and dyeing wastewater by using recycled carbon dioxide instead of waste acid:

[0029] 1) Store the carbon dioxide recovered from the waste gas in the industrial park and liquefied and purified in the carbon dioxide storage tank;

[0030] 2) After the liquid carbon dioxide is vaporized by the vaporizer, it is decompressed to 450Mpa by the pressure reducing valve, and then it is fed into the tubular mixer by the automatic control dosing system. The ventilation volume is controlled at 2L / (L min), and the outlet pressure is controlled at 3.5kg / cm 2 , the automatic control dosing system sets the pH value control to 8.0;

[0031] 3) The printing and dyeing wastewater is uniformly mixed with carbon dioxide in the tubular mixer after being regulated by the regulating tank;

[0032] 4) The printing and dyeing wastewater passes through the tubular mixer and then enters the mixing pool, so that the wastewater and carbon dioxide are...

Embodiment 3

[0034] A pretreatment method for neutralizing printing and dyeing wastewater by using recycled carbon dioxide instead of waste acid:

[0035] 1) Store the carbon dioxide recovered from the waste gas in the industrial park and liquefied and purified in the carbon dioxide storage tank;

[0036] 2) After the liquid carbon dioxide is vaporized by the vaporizer, it is decompressed to 450Mpa by the pressure reducing valve, and then it is fed into the tubular mixer by the automatic control dosing system. The ventilation volume is controlled at 2L / (L min), and the outlet pressure is controlled at 4.5kg / cm 2 , the automatic control dosing system sets the pH value control to 8.5;

[0037] 3) The printing and dyeing wastewater is uniformly mixed with carbon dioxide in the tubular mixer after being regulated by the regulating tank;

[0038] 4) The printing and dyeing wastewater passes through the tubular mixer and then enters the mixing pool, so that the wastewater and carbon dioxide are...

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Abstract

The invention discloses a pretreatment method for neutralizing printing and dyeing waste water. The carbon dioxide which is recovered, purified and liquefied in a chemical engineering garden is used for replacing the waste acid (sulphuric acid) to neutralize high alkalinity printing and dyeing waste water. Liquid state carbon dioxide in a storage tank is introduced into a tubular mixer by a self control feeding system through a vaporizer so as to be mixed with the printing and dyeing waste water; meanwhile, an online pH monitor is arranged in front of a mixing pool; the waste water pH value isfed back to the feeding system for automatically regulating and controlling the carbon dioxide adding quantity. The method has the advantages that the problem of anaerobe sulfur poisoning is relieved; the biochemical treatment efficiency is improved; meanwhile, the treatment cost of the printing and dyeing waste water is reduced; the carbon resource recovery and utilization are promoted.

Description

Technical field: [0001] The technical solution of the invention belongs to the field of industrial wastewater treatment, and in particular relates to a pretreatment method for printing and dyeing wastewater. Background technique [0002] Printing and dyeing refers to the process of chemical treatment of textile materials (fibers, yarns, threads and fabrics). Printing and dyeing mainly includes several processes such as desizing, scouring, bleaching, mercerizing, dyeing, printing and finishing. Printing and dyeing wastewater refers to the wastewater discharged from the pretreatment, dyeing, printing and finishing processes of cotton, wool, hemp, chemical fiber or blended products. Printing and dyeing wastewater has the characteristics of high concentration of organic matter, large chroma, complex composition, large changes, and difficult treatment. It is a difficult-to-treat industrial wastewater. [0003] There are four main treatment methods for printing and dyeing wastew...

Claims

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Application Information

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IPC IPC(8): C02F1/66C01B32/50C02F103/30
CPCC02F1/66C02F2103/30C02F2209/06C02F2209/245C01B32/50
Inventor 操家顺李超钱唐健薛朝霞方芳冯骞周仕华
Owner HOHAI UNIV
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