The technology of sewage treatment equipment is diverse, and according to its treatment principle and different treatment objects, it can be mainly divided into the following categories:

First, physical processing technology

Physical treatment technology mainly separates suspended matter and precipitable matter from water through physical effects, such as gravity and centrifugation. Common devices and technologies include:

Sedimentation tank: The density of suspended particles in sewage is different from that of water, and the suspended particles are separated from sewage by natural precipitation or coagulation precipitation.

Filter tank: The use of filtration materials (such as filters, filter cloth, etc.) to intercept suspended particles, microorganisms and dissolved substances in sewage to achieve the purpose of purifying water quality.

Grid decontaminator: used to intercept and remove various shapes of debris in the fluid, driven by the motor reducer, the rake tooth chain on the equipment will do rotary movement in the direction of the reverse flow, so as to remove solid impurities in the sewage.

Second, chemical treatment technology

Chemical treatment technology converts or separates harmful substances in sewage through chemical reactions. Common devices and technologies include:

REDOX reactor: by adding oxidants or reducing agents, harmful substances in sewage are oxidized or reduced to harmless substances.

Ion exchanger: Use the exchange function of ion exchange resin to remove ionic harmful substances in sewage.

Neutralization tank: By adding acid or alkali, acidic or alkaline substances in sewage are neutralized into neutral substances.

Third, biological treatment technology

Biological treatment technology uses the role of microorganisms to transform organic matter in sewage into inorganic substances and living organisms. Common devices and technologies include:

Activated sludge method: The microbial community in activated sludge is used to adsorb, degrade and transform organic substances in sewage. Activated sludge process is a common biological treatment technology, which has the advantages of good treatment effect, low energy consumption and simple operation.

Biofilm method: The use of biofilm to adsorb, degrade and transform organic substances in sewage. The biofilm method also has the advantages of good treatment effect, strong impact load resistance and easy operation. Common biofilm processing equipment includes biological turntable, biological filter and so on.

Fourth, membrane treatment technology

Membrane treatment technology separates dissolved substances and particles in sewage through a semi-permeable membrane. Common devices and technologies include:

Ultrafiltration: Use the high-precision filtration performance of ultrafiltration membrane to remove small particles, colloids, bacteria and viruses in sewage.

Reverse osmosis: under the pressure drive, through the selective permeability of reverse osmosis membrane, the dissolved solids, organic matter, bacteria, viruses, etc. in sewage are trapped on one side of the membrane, so as to achieve the purification of water quality.

Fifth, other special processing technology

In addition to the above main treatment technologies, there are some special sewage treatment equipment and technologies, such as:

Air float tank: The adsorption of tiny bubbles is used to float suspended particles and colloidal substances in sewage to the surface and remove them.

Sludge treatment equipment: such as sludge dewatering machine, sludge thickening tank, etc., used to treat the sludge generated in the sewage treatment process.

Biogas power generation system: The biogas generated in the sewage treatment process is used for power generation to achieve energy recycling.

In summary, there are many kinds of technologies of sewage treatment equipment, each with its own characteristics and scope of application. In practical applications, it is necessary to choose the appropriate treatment technology and equipment according to the nature of sewage, treatment requirements and treatment scale.