Physical method:

Polyacrylamide is a wastewater treatment method that separates and recovers insoluble suspended pollutants (including oil film and oil beads) in wastewater by physical action. The treatment method based on the principle of heat exchange also belongs to the physical treatment method.

Polyacrylamide chemical method:

A wastewater treatment method that separates and removes dissolved and colloidal pollutants in wastewater through chemical reactions and mass transfer, or converts them into harmless substances. In the chemical treatment method, the treatment units based on chemical reaction by adding chemicals are: coagulation, neutralization, redox, etc.; while the treatment units based on mass transfer are: extraction, stripping, stripping , adsorption, ion exchange, electrodialysis and reverse osmosis, etc. The latter two processing units are collectively referred to as membrane separation technology. Among them, the treatment unit that uses mass transfer has both chemical effects and physical effects related to it, so it can also be separated from chemical treatment methods and become another type of treatment method, called physical and chemical methods.

Microbial Methods:

Through the metabolism of microorganisms, the organic pollutants in the waste water in the state of solution, colloid and fine suspension are converted into stable and harmless substances. According to the different microorganisms, biological treatment methods can be divided into two types: aerobic biological treatment and anaerobic biological treatment. The aerobic biological treatment method is widely used in the biological treatment of wastewater. Traditionally, the aerobic biological treatment method is divided into two categories: activated sludge method and biofilm method. The activated sludge process is itself a treatment unit, and it operates in a variety of ways. The processing equipment belonging to the biofilm method includes biological filters, biological turntables, biological contact oxidation tanks and biological fluidized beds. Biological oxidation pond method is also called natural biological treatment method. Anaerobic biological treatment, also known as biological reduction treatment, is mainly used to treat high-concentration organic wastewater and sludge. The processing equipment used is mainly a digester.