Wastewater treatment equipment is mainly used for the treatment of domestic sewage and similar industrial organic sewage. The main treatment method is to use the currently mature biochemical treatment technology contact oxidation method. The water quality parameters are designed according to the general domestic water quality, with inlet BOD of 20Omg/l and outlet BOD of 20mg/l. It consists of six parts: (1) primary sedimentation tank; (2) Contact oxidation tank; (3) Secondary sedimentation tank; (4) Disinfection pool and disinfection device; (5) Sludge tank; (6) Fan room, fan

Process description:
(1) Primary sedimentation tank: The equipment's primary sedimentation tank is a vertical flow sedimentation tank, and the upward flow velocity of sewage in the sedimentation tank is 0.6-0.7 mm/s. The settled sludge is carried to the sludge tank by air. (Note: WSZ-A O.5-5m3/h does not have a primary sedimentation tank)
(2) Contact oxidation tank: After initial sedimentation, the water flows automatically to the contact tank for biochemical treatment. The contact tank is divided into three stages with a total residence time of more than 1 hour. The contact oxidation time of the reinforced equipment can reach 6 hours, and the filler is a novel trapezoidal filler. Easy to form conjunctiva and not clog. The specific surface area of the filler is 160m2/m3, and the gas water ratio of the contact tank is around 12:1. (WSZ-A 0.5-5T/h, contact cell is secondary)
(3) Secondary sedimentation tank: Biochemical wastewater flows into the secondary sedimentation tank, which consists of two vertical flow sedimentation tanks operating in parallel. The upward flow velocity is 0.3-0.4 millimeters per second. The sludge is discharged by air lifting to the sludge tank. (Note WSZA 0.5-5mT/h, sludge flows automatically into the sludge tank)
(4) Disinfection pool and disinfection device: The disinfection pool follows the standard of "TJI474" for 30 minutes. If it is hospital sewage, the retention time of the disinfection pool can be increased to 1-1.5 hours. The disinfection method of solid chlorine contact dissolution is used. The disinfection device can continuously change the dosage according to the size of the water output, achieving the goal of adding more water and more medicine, and adding less water and less medicine. Other disinfection devices can be prepared separately. (Note: If used for industrial wastewater disinfection tanks and disinfection devices, it is not necessary)
(5) Sludge tank: All sludge from the primary and secondary sedimentation tanks is transported by air to the WSZ-A sludge tank for aerobic digestion. The clear liquid from the sludge tank flows back to the contact oxidation tank for further treatment. After digestion, there is very little residual sludge, usually cleaned once every 1-2 years. The cleaning method can be to use a suction truck to extend from the inspection hole of the sludge tank into the bottom of the sludge and carry out suction and transportation. (WSZ-A 0.5-5T/h, sludge is digested anaerobically)
(6) Fan room and fan: The fan room of equipment WSZ-A is located above the disinfection pool, and the inlet adopts double-layer sound insulation. The inlet has a muffler and fan filter, so there is no noise during operation. The fan adopts two L-shaped Roots blowers, which can automatically alternate operation. The operating life of a single wind turbine is about 30000 hours.