Method for treating acid waste water of disperse dye

A technology for acidic wastewater and disperse dyes, which is applied in water/sewage multi-stage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc. It can solve secondary pollution, high safety risks, and skin irritation and other issues, to achieve the effect of reducing production and operating costs, good economic feasibility, and no secondary pollution

Inactive Publication Date: 2013-08-14
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the production process of the dye industry, a large amount of high acidity and high COD wastewater will be produced. If this wastewater is not treated, it will seriously pollute the environment. The traditional acid wastewater treatment method is to use lime to neutralize, but the treatment cost is high and the treatment A large amount of calcium sulfate and attached organic matter will be produced in the process, which is the secondary pollution caused by the three wastes treatment process. Therefore, the treatment of the three wastes, especially the wastewater treatment, has always been a difficult problem in the treatment of dye pollution sources. Effective, safe and clean treatment cannot be obtained. will seriously restrict the development of enterprises
[0003] In recent years, many literatures have reported that the acidity in wastewater is neutralized. Considering the cost factor, ammonia water is generally used as a neutralizer. This method solves the problem of high acidity in wastewater to a certain extent. However, due to Ammonia water has weak alkalinity and instability, while ammonia water is colorless, transparent, has a pungent smell, and is volatile. During use, it will bring a pungent smell to the process and cause secondary pollution. At the same time, due to the Volatile, ammonia gas (NH 3 ) will be irritating and corrosive to the eyes, nose, and skin of the human body and cause suffocation. When the ammonia gas content reaches a certain concentration, it will cause safety accidents in case of fire or heat. Accidents continue in the field of ammonia use at home and abroad, especially In recent years, in my country, ammonia has been managed as a major hazard source. It can be seen that the use of ammonia for wastewater treatment is extremely dangerous.

Method used

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  • Method for treating acid waste water of disperse dye

Examples

Experimental program
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Effect test

Embodiment 1

[0035]Add sulfuric acid acid wastewater from industrial production (containing 10% sulfuric acid, COD value 5000-7000mg / l) into the neutralization tank, start stirring, and add caustic soda to neutralize the acid wastewater until the pH value of the solution is 5.0-7.0, keep the temperature Add activated carbon adsorbent with 0.5% of the total mass of wastewater at 50°C, stir continuously for 2 hours, filter and sample to detect that the COD value of the solution has dropped to 1000-1200mg / l, and the removal rate of organic matter is above 80%, and the filtrate is evaporated and concentrated, and the crystals are filtered out Sodium sulfate salt has been tested to meet the industry standard of sodium sulfate salt. It can be used as a filler for reactive dyes. The concentrated separation liquid is returned to the adsorption system for continued adsorption. The evaporated hot water is used for product washing.

Embodiment 2

[0037] Add hydrochloric acid acid wastewater from industrial production (containing 7% hydrochloric acid, COD value 4000-5000mg / l) into the neutralization tank, start stirring, neutralize the acid wastewater with a mixture of sodium carbonate and baking soda to a pH value of 5.0-7.0, and end For neutralization, add 1% water to the neutralization liquid to mix the adsorbent with activated carbon and diatomite, the mixing ratio (mass ratio) of activated carbon and diatomite is 1:1, stir continuously for 1.5h, filter and separate the adsorbent, and take a sample to test the solution The COD value drops to 500-800mg / l, the adsorption operation is completed, the sodium chloride solution is evaporated and concentrated, and the sodium chloride salt is separated, which meets the industry standard after testing and can be used for salting out in industrial production; the mother liquor is concentrated and filtered back to The adsorption system continues to adsorb; the evaporated and con...

Embodiment 3

[0039] Put sulfuric acid wastewater from industrial production (containing 15% sulfuric acid, COD value 6000-7000mg / L) into the adsorption kettle, use 4% of the mass of sulfuric acid wastewater to be treated with a mixture of activated carbon and diatomite, activated carbon and diatomite The mixing ratio (mass ratio) is 1:3, and the adsorption is carried out. The COD value of the water sample is taken to drop to 500-600mg / l. After the adsorption operation is completed, the adsorbent is separated. Evaporate and concentrate the neutralizing liquid, separate the tidal product of sodium sulfate crystallization, take a sample after drying to meet the industrial filler standard, concentrate and filter the mother liquor and return it to the adsorption system to continue the adsorption, and reuse the evaporated and condensed hot water for heating other industrial products, or This product produces a hydrating top.

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Abstract

The invention relates to a method for treating acid waste water of disperse dye, belonging to the technical field of three-waste treatment in the dye industry. The method comprises the steps of: firstly, collecting sulfuric acid or hydrochloric acid waste water from industrial production; neutralizing the pH value of the acid waste water to 5.0-7.0; adding an adsorbent, namely activated carbon, kieselguhr or any mixture of the activated carbon and the kieselguhr to implement adsorption bleaching; filtering and separating the adsorbent; and finally evaporating, concentrating and crystallizing the waste water, thereby obtaining high-quality damp sodium sulfate or sodium chloride which can be reused after being dried. The method has the advantages of environment friendliness, high efficiency, good feasibility and the like.

Description

technical field [0001] The invention relates to an acid wastewater treatment method for disperse dyes, belonging to the technical field of three wastes treatment in the dye industry. Background technique [0002] In the production process of the dye industry, a large amount of high acidity and high COD wastewater will be produced. If this wastewater is not treated, it will seriously pollute the environment. The traditional acid wastewater treatment method is to use lime to neutralize, but the treatment cost is high and the treatment A large amount of calcium sulfate and attached organic matter will be produced in the process, which is the secondary pollution caused by the three wastes treatment process. Therefore, the treatment of the three wastes, especially the wastewater treatment, has always been a difficult problem in the treatment of dye pollution sources. Effective, safe and clean treatment cannot be obtained. It will seriously restrict the development of enterprises....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D3/06C01D5/02C02F1/28
Inventor 胡启木李学坤
Owner ZHEJIANG QICAI ECO TECH CO LTD
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