Physical treatment method: The wastewater treatment method for separating and recovering undissolved pollutants (including oil film and oil beads) in the wastewater by physical action can be divided into gravity separation method, centrifugal separation method and sieve filtration retention method. The processing method based on the principle of heat exchange is also a physical processing method. Chemical treatment: A wastewater treatment method that separates and removes dissolved or colloidal contaminants in wastewater or converts them into harmless substances through chemical reaction and mass transfer. In the chemical treatment method, the processing unit based on the chemical reaction of the dosage is: coagulation, neutralization, redox, etc.; and the processing unit based on mass transfer is: extraction, stripping, stripping , adsorption, ion exchange and electrodialysis and reverse osmosis. The latter two processing units are also collectively referred to as membrane separation techniques. The processing unit using mass transfer has both chemical and physical effects, so it can be separated from the chemical treatment method and become another processing method called physical chemistry. Biological treatment method: a waste water treatment method that converts organic pollutants in a wastewater, which is a solution, a colloid, and a fine suspension state, into a stable and harmless substance by the metabolism of microorganisms. According to the different microorganisms, the biological treatment method can be divided into two types: aerobic biological treatment and anaerobic biological treatment. Aerobic biological treatment is widely used in biological treatment of wastewater. According to the tradition, aerobic biological treatment is divided into two types: activated sludge method and biofilm method. The activated sludge process itself is a processing unit that operates in a variety of ways. The treatment equipment belonging to the biofilm method includes a biological filter, a biological turntable, a biological contact oxidation tank, and a recently developed biological fluidized bed. The biological oxidation pond method is also called the 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. Biological contact oxidation method: the biological contact oxidation process is used to treat the wastewater, that is, the biological reaction tank is filled with the filler by the biological contact oxidation process, the already filled oxygenated sewage is immersed in all the fillers, and flows through the filler at a certain flow rate. The filler is covered with biofilm, and the sewage is in extensive contact with the biofilm. Under the action of microbial metabolism on the biofilm, the organic pollutants in the sewage are removed and the sewage is purified. Finally, the treated wastewater is discharged into the biological contact oxidation treatment system and mixed with domestic sewage for treatment, and discharged after chlorine disinfection. The biological contact oxidation method is a biofilm process between the activated sludge process and the biological filter, which is characterized in that a filler is arranged in the pool, the bottom aeration of the pool is used to oxygenate the sewage, and the sewage in the pool is in a flow. The state is to ensure that the sewage is fully contacted with the filler immersed in the sewage, and the defect that the sewage and the filler are not uniformly contacted in the biological contact oxidation pond is avoided, and the aeration device is called blast aeration. CNH-case Clutch Disc,CX1100 Piston Assy,CNH-case Spare Parts,CASE Piston Assy JINING SHANTE SONGZHENG CONSTRUCTION MACHINERY CO.LTD , https://www.sdkomatsugenuineparts.com
Domestic sewage treatment method