Method for treating acid waste water of disperse dye

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....

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.

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