Working principle of sedimentation tank in domestic sewage treatment equipment

Different types of wastewater have different characteristics and key purification points. Wastewater from the same industry often contains multiple pollutants that need to be treated simultaneously, making treatment very difficult. The composition of related wastewater treatment equipment and treatment processes are also quite complex. Sedimentation tanks are an important part of the complex composition of various wastewater treatment equipment. Let's take a look at Domestic wastewater treatment equipment and the working principle of sedimentation tanks.

　　Sedimentation tanks utilize the principle that suspended particulate matter in water flows downwards at a speed greater than the downward flow speed of the water, or that the downward sedimentation time is less than the time it takes for the water to flow out of the sedimentation tank, allowing separation from the water flow, thus achieving water purification.

　　In sedimentation tanks, the principle of sedimentation can be used to remove inorganic impurities from water. In primary sedimentation tanks, it removes suspended solids and other solid matter. In secondary sedimentation tanks, it removes activated sludge from biologically treated effluent. In thickening tanks, it separates water from sludge, concentrating the sludge. In advanced treatment, after coagulation reaction with flocculants added to the effluent of secondary sedimentation tanks, the principle of sedimentation can be used to remove suspended solids.

Sedimentation tanks consist of five parts: the inlet zone, sedimentation zone, buffer zone, sludge zone, and outlet zone. The inlet and outlet zones ensure that the water flows evenly through the sedimentation tank, avoiding short-circuiting and reducing the adverse effects of turbulence on sedimentation, while reducing dead zones and improving the volumetric utilization rate of the sedimentation tank. The sedimentation zone, also known as the clarification zone, is the working area of the sedimentation tank, where the settling particles are separated from the wastewater. The sludge zone is the area where sludge is stored, concentrated, and discharged. The buffer zone is the water layer separating the sedimentation zone and the sludge zone, ensuring that the settled particles are not stirred up by the water flow.

　　This is an introduction to the working principle of sedimentation tanks in domestic wastewater treatment equipment. We can see that these sedimentation tanks have five parts: the inlet zone, sedimentation zone, buffer zone, sludge zone, and outlet zone. Each part plays an important role in wastewater purification. Therefore, we must also understand the corresponding operation and maintenance methods.