Printing and dyeing wastewater refers to the wastewater containing pigments, alkaline substances, heavy metals and other harmful substances produced in the process of printing and dyeing. If this kind of wastewater is discharged directly into rivers, lakes and other water bodies without treatment, it will cause pollution to the water body and cause harm to the environment and ecology. Therefore, the treatment of printing and dyeing wastewater is an important environmental protection issue.

In order to solve the problem of printing and dyeing wastewater treatment, we must adopt scientific and reasonable treatment methods and technologies to minimize its harm to the environment and ecology. The current treatment methods mainly include chemical treatment, biological treatment, physical treatment and other ways. Printing and dyeing wastewater treatment equipment is an important part of the treatment method.

Below we will specifically introduce the printing and dyeing wastewater treatment equipment solutions.

First, chemical treatment method:

Chemical method is one of the traditional methods of printing and dyeing wastewater treatment, usually using precipitation method, oxidation method, reduction method, etc., to convert harmful substances into substances that are insoluble in water and precipitation, so as to achieve the purpose of purifying water quality. Commonly used chemical treatment agents include oxidants, reducing agents, pH regulators, flocculants and so on. According to the water quality characteristics of printing and dyeing wastewater and the different types of pollutants, different process routes and chemical agents will be used.

Common chemical treatment equipment are: flocculator, precipitation clarifier, reagent storage tank, reactor, charged neutralization reactor, high pressure ozone sterilizer, activated carbon adsorbent and so on.

2. Biological treatment method:

Biological treatment refers to the use of biological bacteria to degrade, transform, adsorption and other chemical reactions of printing and dyeing wastewater, so as to achieve the purpose of purifying water quality. The biological treatment method has the characteristics of simple operation, low consumption and high treatment efficiency, and has been widely used.

Biological treatment equipment includes: aeration tank, biochemical treatment tank, biofilm reactor, anaerobic reaction tank, etc.

Third, physical treatment method:

Physical treatment method refers to the separation, precipitation and removal of harmful substances in wastewater through the change of physical and chemical properties. The main physical treatment methods are filtration, adsorption, membrane separation, electrolysis, air flotation and so on. When using the physical treatment method, the focus is on selecting the right separation material with separation capability and low pressure loss.

Physical processing equipment includes: filter, activated carbon adsorbers, ion exchangers, membrane separation equipment, electrolytic equipment, etc.

Iv. Comprehensive treatment:

As the composition of printing and dyeing wastewater is relatively complex, a single treatment process is not enough to meet the required discharge standards, so the comprehensive treatment process route will adopt chemical treatment, biological treatment and physical treatment, comprehensive use of various methods to layer the pollutants for water purification. This comprehensive treatment method has the advantages of high efficiency, energy saving and no secondary pollution, and has been widely used and popularized.

Comprehensive treatment equipment includes: anaerobic - aerobic combination process, biofilm reactor, MBR process, etc.

In short, printing and dyeing wastewater treatment is a very important environmental protection task, the selection of treatment equipment and treatment methods need to consider a variety of factors, the use of scientific and reasonable and economically feasible treatment methods, in order to better solve the problem of printing and dyeing wastewater discharge, for our environment and health escort.