Printing and Dyeing Wastewater Treatment Solution
Automatic filter press machine manufacturer offers a comprehensive wastewater treatment solution for printing and dyeing industries. In this article, you will get something important about printing and dyeing wastewater.
What is printing and dyeing wastewater
The printing and dyeing wastewater is the wastewater discharged from the printing and dyeing plants that mainly process cotton, hemp, chemical fiber and their blended products. The main methods used for the treatment of printing and dyeing wastewater include physical-chemical method, biochemical method, chemical method and several combined treatment methods. The pretreatment of wastewater treatment is mainly to improve the quality of wastewater, remove suspended solids and impurities that can be directly settled, adjust the quality and quantity of wastewater, reduce the temperature of wastewater, improve the overall effect of wastewater treatment, and ensure the stability of the entire treatment system, Therefore, pretreatment plays an extremely important role in the treatment of printing and dyeing wastewater.
Types of textile printing and dyeing wastewater
Textile printing and dyeing wastewater has different water quality due to its different products and production processes. According to the degree of difference in water quality, the wastewater from textile printing and dyeing industry can be divided into three categories with obvious characteristics.
1.Wool washing wastewater
2.Chemical fiber industrial wastewater
3.Textile printing and dyeing wastewater and water wool spinning and finishing wastewater
Printing and Dyeing Wastewater Treatment Solution
Textile printing and dyeing wastewater is characterized by large amount of water, high content of organic pollutants, large alkalinity, and great changes in water quality. It is one of the industrial wastewater that is difficult to treat. The wastewater contains dyes, size, additives, oil, acid and alkali, fiber impurities, sand substances, inorganic salts, etc.
The printing and dyeing industry consumes a large amount of water. Generally, 100 to 200 tons of water is consumed per 1 ton of textile processing, 80 to 90% of which is discharged as printing and dyeing wastewater. As an automatic filter press machine manufacturer, we will share common treatment methods including recycling and harmless treatment.
- Recycling
The wastewater can be recycled according to the characteristics of water quality, such as the separation of bleaching and boiling wastewater and dyeing and printing wastewater. The former can be used for convection washing, and one water can be used for multiple purposes to reduce the discharge.
The alkali liquor is usually recovered by evaporation. If the amount of alkali liquor is large, it can be recovered by three-effect evaporation. If the amount of alkali liquor is small, it can be recovered by film evaporation.
Dye recovery, such as shilin dye, can be acidified into cryptopaic acid, suspended in the residual liquid as colloidal particles, and recycled after sedimentation and filtration.
- Harmless treatment
Harmless treatment includes Physical treatment,such as Sedimentation and Adsorption.
Sedimentation method is mainly used to remove suspended solids in wastewater, and adsorption method is mainly used to remove dissolved pollutants and decolorize in wastewater.
Chemical treatment methods include neutralization, coagulation and oxidation. The neutralization method is to adjust the acidity and alkalinity of the wastewater, and also to reduce the chroma of the wastewater; Coagulation is used to remove disperse dyes and colloidal substances in wastewater. The oxidation method is to oxidize the reducing substances in the waste water and precipitate the sulfide dyes and vat dyes.
Biological treatment methods include activated sludge, biological rotary table, biological rotary drum and biological contact oxidation method. In order to improve the effluent quality and meet the discharge standards or recovery requirements, several methods are often used for joint treatment.
Printing and Dyeing Wastewater Treatment Solution in automatic filter press machine manufacturers
Printing and Dyeing Wastewater Treatment Solution from an automatic filter press machine manufacturer is a comprehensive, cost-effective solution to treat wastewater from the printing and dyeing industry. It uses advanced filtration technology to effectively remove suspended solids, oil, grease, and other pollutants from wastewater. The system is designed for easy installation and operation and requires minimal maintenance. The treated water can be reused for other industrial processes and is safe for discharge into the environment. This solution is an ideal choice for any printing and dyeing facility looking for reliable, efficient wastewater treatment.
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