Domestic sewage refers to the wastewater generated by residents in their daily lives, including toilet drainage, washing drainage, kitchen drainage and other household miscellaneous drainage. Domestic sewage contains a large amount of organic matter, inorganic matter, microorganisms and impurities, such as proteins, oils, carbohydrates, ammonia nitrogen, phosphorus and various bacteria. These pollutants and impurities can cause serious harm to the environment and ecosystems if not properly treated. Therefore, domestic sewage needs to be treated to meet the discharge standard or the standard of utilization to protect the environment and human health.
Domestic sewage treatment equipment and its principle and function are as follows:
1. Septic tank: Septic tank is a treatment facility that uses the principle of sedimentation and anaerobic fermentation to remove suspended organic matter in domestic sewage. The principle is to decompose the solids at the bottom of the pool, and the hydrated objects in the upper layer enter the pipes to flow away, preventing the pipes from being blocked, and at the same time giving the solids (feces and other garbage) enough time to hydrolyze.
2. Air flotation machine: Air flotation machine is a water treatment equipment that uses small bubbles or tiny bubbles to surface impurities in the medium. A large number of fine bubbles are generated in the water through the dissolved air system, so that the air is attached to the suspended solids particles in the form of highly dispersed micro bubbles, resulting in a state with a density less than that of water, and the principle of buoyancy is used to make it float on the water surface to achieve solid-liquid separation.
3. Aerator: Through the rotation of the impeller, the air is introduced into the sewage, the dissolved oxygen in the sewage is increased, and the microbial activity is promoted, which is mainly used to improve water quality and promote the growth and reproduction of microorganisms.
4. Drum filter: The drum filter relies on the gravity of the liquid itself to penetrate the filter cloth to isolate debris, so as to achieve the purpose of purifying the liquid.
5. Centrifuge: The powerful centrifugal force generated by the high-speed rotation of the centrifuge rotor is used to accelerate the sedimentation rate of particles in the liquid, which is mainly used for solid-liquid separation.
6. Grid decontamination machine: used to remove large particles and impurities in sewage and protect the follow-up treatment equipment from damage.
7. Oil-water separator: remove grease and water in sewage by physical and chemical methods to achieve the purpose of oil-water separation.
8. Filter press: dewater the sludge by pressurizing to form a mud cake, which is convenient for transportation and treatment.
9. Submersible mixer: used to mix and circulate sewage to promote microbial growth and decomposition of organic matter.
10. Screw conveyor: used to transport solid substances, such as sludge and residual activated sludge.
11. Sludge pump: used to transport sludge and suspended solids for subsequent treatment and disposal.
These devices work together to complete the treatment of domestic sewage through different principles and functions. The treated effluent can meet the discharge standard. These devices can be used individually or combined to form a complete wastewater treatment system. Customers can choose and configure according to different treatment requirements and wastewater characteristics.