Primary Settling Tank: The primary settling tank is a vertical flow sedimentation tank. The upward flow velocity of the wastewater in the settling tank is 0.6-0.7 mm/s. The settled sludge is lifted to the sludge tank by air.
Contact Oxidation Tank: After primary settling, the water flows by gravity to the contact tank for biochemical treatment. The contact tank is divided into three stages, with a total retention time of more than 1 hour. The enhanced equipment can achieve a contact oxidation time of up to 6 hours, using novel trapezoidal packing material. It is easy to form a biofilm and does not clog.
Secondary Settling Tank: After biochemical treatment, the wastewater flows to the secondary settling tank, which consists of two vertical flow sedimentation tanks operating in parallel. The upward flow velocity is 0.3-0.4 mm/s. Sludge is lifted to the sludge tank by air.
Disinfection Tank and Disinfection Device: The disinfection tank is designed for 30 minutes according to the "TJI4-74" standard. For hospital wastewater, the retention time can be increased to 1-1.5 hours. Solid chlorine tablets are used for contact dissolution disinfection. The disinfection device can continuously adjust the dosage according to the effluent flow rate, achieving the goal of adding more chemicals for higher flow rates and less chemicals for lower flow rates. Other disinfection devices can be configured separately.
Sludge Tank: All sludge from the primary and secondary sedimentation tanks is airlifted to the WSZ-A sludge tank for aerobic digestion. The clarified liquid from the sludge tank is returned to the contact oxidation tank for further treatment. Very little sludge remains after digestion, and it is generally cleaned every 1-2 years. Cleaning can be done by using a vacuum truck to reach into the bottom of the sludge tank through the inspection hole and pump it out. (6) Blower Room and Blowers: The blower room of the integrated sewage treatment equipment is located above the disinfection tank. The inlet is equipped with double-layer sound insulation, and the air inlet has a silencer and blower filter, so there is no noise during operation. The blower uses two L-type Roots blowers, which can automatically alternate operation. The service life of a single blower is about 30,000 hours.
