Stainless steel paddle mixers are key equipment in water treatment processes, enabling the homogenization and flow of solid-liquid two-phase and solid-liquid-gas three-phase flows during biochemical water treatment. They consist of a submersible motor, gearbox, impellers, and installation system.
Stainless steel paddle mixers are mixing devices suitable for mixing various low-viscosity liquids, solids, and gases; they are suitable not only for circular and square tanks but also for rectangular tanks and are commonly used in sub-unit layouts. In various wastewater treatment processes in my country, paddle mixers primarily overcome the problems of dead zones and poor water-air mixing in traditional paddle mixers, demonstrating their advantage of uniform mixing.
So how does it work? Let's take a look:
1. Hydraulic Circulation: The mixer only needs to provide circulation flow in anaerobic tanks, anoxic tanks, and oxidation ditches to keep the mixed liquid in the tank in a suspended state, ensuring full contact between microorganisms and the substrate, forming a continuous circulating water flow that receives energy from the mixer. This design not only maintains the suspension of the mixed liquor, but also, because the flow rate of the circulating water inside the tank is typically tens or even hundreds of times higher than the influent flow rate, the water flow inside the tank has a huge dilution and homogenization capacity. Therefore, this reactor has excellent resistance to shock loads.
2. Water Quality: Many polluted water bodies and deep treatment tanks used for wastewater treatment often suffer from water depth, poor water flow, and insufficient surface reoxygenation to meet the oxygen requirements of the deeper water areas. Submersible mixers can be installed in the deeper water areas for reoxygenation, improving the overall water quality.
3. Improved Oxygen Transfer Efficiency: Aeration is a fundamental means of maintaining the normal metabolism of aerobic microorganisms. The oxygen transfer efficiency of underwater aeration systems is directly related to water depth. In the aeration tank, a stainless steel paddle mixer is used to design the aeration tank as a continuous circulating flow tank as described above. Under the action of the circulating flow, the path of the "bubbles" released by the aeration heads is changed, increasing the "oxygen transfer depth" and improving oxygen transfer efficiency.
