Aerator-mixer STM-Aerotor™

STM-Aerotor™ Biological Nutrient Removal System Overview: The STM-Aerotor™ Biological Nutrient Removal System uses Integrated Fixed Film and Activated Sludge (IFAS) technology as part of a process that provides biological nutrient removal for municipal and industrial wastewater treatment. How it works: With every rotation, the STM-Aerotor captures atmospheric air, draws it down into mixed liquor in a steel or concrete basin, and slowly releases it as course bubble aeration. During the rotation, additional cascade aeration elevates the dissolved oxygen in the upper layer of the basin. The combination of the slow rotation of the STM-Aerotor, intense air release, and the addition of a peripheral mixing paddle ensure a thoroughly mixed system. In addition, The STM-Aerotor includes a large surface area for fixed film growth. The interior and exterior of the special polypropylene discs provide the perfect environment for a variety of attached growth organisms. These organisms will react quickly to an increased food source, or shock load, to eliminate discharge violations during peak or diurnal fluctuations. The amount of aeration can be controlled using a variable speed drive connected to the rotor, causing it to rotate faster or slower based on the actual oxygen demand. The STM-Aerotor combines activated sludge and fixed film in a compact biological treatment system that requires a low power input. The unique media of the STM-Aerotor provides both the fixed film surface area and the vehicle for coarse bubble aeration.