What are the basic methods of wastewater treatment? What is the purpose of wastewater treatment? What are the methods of wastewater treatment? What are the methods of wastewater treatment? What are the basic methods and characteristics of wastewater treatment? The issue of waiting and so on has always been a problem that the wastewater treatment industry needs to understand.

Due to the rapid development of industry, the improvement of national living standards, and the decline in water resource quality, wastewater treatment is urgent.

What is the purpose of wastewater treatment?

The purpose of wastewater treatment is to separate pollutants from wastewater in a certain way, or decompose them into harmless and stable substances, in order to purify the wastewater.

Generally, it is necessary to prevent the transmission of toxins and bacteria; Avoid visible objects with unpleasant odors and unpleasant sensations to meet the requirements of different uses.

What are the basic methods of wastewater treatment?

According to the principles of wastewater treatment methods, they can be divided into three types: physical method, biological method, and chemical method:

The first method is physical method, which mainly uses physical interactions to separate insoluble substances in wastewater without changing chemical properties during the treatment process.

Commonly used methods include gravity separation, centrifugal separation, reverse osmosis, air flotation, etc. Utilize physical processes to treat, separate, and recover pollutants from wastewater.

For example, using sedimentation method to remove suspended particles with a relative density greater than 1 in water while recovering these particles;

Flotation method (or air flotation method) can remove emulsified oil droplets or suspended solids with a relative density close to 1;

The filtration method can remove suspended particles from water;

The evaporation method is used to concentrate non volatile soluble substances in wastewater.

The second method is biological method: use the metabolic function of microorganisms to decompose and oxidize the dissolved or colloidal organic substances in the sewage into stable inorganic substances to purify the sewage.

For example, biofiltration and activated sludge processes are used to treat domestic wastewater or organic production wastewater, transforming and degrading organic matter into inorganic salts for purification.

Commonly used methods include activated sludge method and biofilm method. The degree of biological treatment is higher than that of physical treatment.

The third method, chemical method, is the use of chemical reactions to treat or recover dissolved or colloidal substances from wastewater, commonly used in industrial wastewater.

Commonly used methods include coagulation, neutralization, redox, ion exchange, etc. The chemical treatment method has good treatment effect and high cost, and is often used as the effluent after biochemical treatment for further treatment to improve the quality of the effluent!

The above methods all have corresponding adaptability ranges for wastewater treatment. When choosing wastewater treatment methods, it is necessary to learn from each other's strengths and weaknesses, and it is often difficult to achieve good treatment results with one method.

Which method is used to treat a type of wastewater? Firstly, it is based on the water quality and quantity of the wastewater, the requirements for water discharge, the economic value of waste recycling, and the characteristics of the treatment method. Then, through investigation and research, scientific experiments are conducted, and determined based on the indicators of wastewater discharge, regional conditions, and technical feasibility.