Sewage Engineering Roots Blower: Aeration tank and sedimentation tank are generally combined to form a process flow. The first sedimentation tank is set in front of the aeration tank, and the second sedimentation tank is set behind the aeration tank, which is used for the pretreatment and post-treatment of wastewater respectively. The aeration tank is also co-built with the secondary sedimentation tank. The facility is composed of four parts: aeration area, diversion area, precipitation area and reflux area.
Aeration tank and sedimentation tank are generally combined to form a process flow. The first sedimentation tank is set in front of the aeration tank, and the second sedimentation tank is set behind the aeration tank, which is used for the pretreatment and post-treatment of wastewater respectively. The aeration tank is also co-built with the secondary sedimentation tank. The facility is composed of four parts: aeration area, diversion area, precipitation area and reflux area.
The function of diversion zone is to coagulate sludge and separate gas and water to create conditions for precipitation. In the aeration zone, the wastewater is fully mixed with the reflux sludge, and then flows into the precipitation zone through the diversion zone, and the clarified water is discharged through the overflow weir. The precipitated sludge flows back into the aeration tank along the bottom of the aeration area. This facility has a compact structure and short process, which can save sludge reflux equipment.
Aeration is a strong contact between air and water, the purpose of which is to dissolve oxygen from the air in the water, or to expel unwanted gases and volatile substances from the water into the air. In other words, it is a means of facilitating the exchange of substances between gases and liquids. It also has other important functions such as mixing and stirring. Oxygen in the air is transferred to water through aeration, and oxygen is transferred from gas to liquid phase by mass transfer. This theory of mass transfer and diffusion is widely used in the double film theory proposed by Lewis and Whitman.
Also known as compressed air aeration, mainly composed of Roots fan and special aerator. The aeration pool using this method is mostly rectangular concrete pool, which is divided into several separate water inlet compartments by partition walls, and each compartment is divided into several corridors. Sewage into the pool after the flow in the corridor, to the other end of the discharge.
The air is transported to the air diffusion device at the bottom of the pool by an air compressor through a pipe, where it disperses and escapes as bubbles, dissolving oxygen into the water at the gas-liquid interface. There are four diffuser types: porous tube, fixed spiral aerator, water injector and microporous diffuser plate.
