Główną konstrukcją oczyszczalni pierwotnej oczyszczalni ścieków jest 2 osadnik.

The process of the urban sewage treatment plant is determined according to the required treatment degree and economic analysis. Usually divided into three levels: ① first-level processing. Using the precipitation method, the removal rates of suspended solids and 5-day BOD can generally reach about 60 percent and 30 percent , respectively. ② secondary treatment. Using the biological treatment method of water, the removal rate of suspended solids and 5-day BOD can generally reach about 90 percent , and the 5-day BOD removal rate is about 60 percent when the high-load rate activated sludge method is used. ③ three-level treatment. Further removal of secondary treatment untreated material. 1 

The main treatment structure of the primary sewage treatment plant is 2 the sedimentation tank. The secondary sewage treatment plant adds a biological device (aeration tank, biological filter tank, biological turntable or aerated biological filter tank, etc.) and a post-sedimentation tank. Because there are sedimentation tanks before and after and the functions are different, the former is often called the primary sedimentation tank, and the latter is the secondary sedimentation tank. There are also auxiliary facilities and facilities for treating sludge in the sedimentation tank. Auxiliary facilities are generally grids and grit chambers (also known as trash pools). The grill removes lumps and pieces of cloth, etc. The grit chamber removes easy sediment to avoid accumulation in the subsequent deep tank and affect the operation. The facilities for treating sludge are generally digesters and dewatering equipment (drying beds or dewatering machines). Wastewater treatment plant buildings usually have pump rooms, laboratories, sludge dewatering machine rooms, repair plants, etc. Activated sludge sewage treatment plants often also have a blower or air compressor room. In order to control the operation, economic dispatch and improve the management level, the sewage treatment plant began to use automation devices and electronic computer control, including: ① remote communication, telemetry, recording and alarm of operating parameters such as water quality, water volume and power supply voltage; ② valve opening and closing and Automatic control and remote control of pump unit scheduling; ③ three-level processing. The effluent quality of the secondary treatment sometimes cannot meet the discharge requirements, so further treatment (or advanced treatment) is required. The effluent from biological treatment is generally rich in ammonia, nitrogen, nitrates and phosphates, and eutrophication is often seen in the discharge of turbulent water bodies such as lakes and bays. At this time, facilities for removing nitrogen and phosphorus are often added. When the effluent is discharged to water bodies with extremely high water quality requirements or to irrigate grasslands, golf courses and recreational green spaces, and the water quality needs to be comprehensively improved, a double-layer filter bed filter is often added. There are also biological ponds and land treatment.