APPARATUS FOR BIOLOGICAL CLEARING OF SEWAGE WATER Russian patent published in 2000 - IPC

FIELD: clearing of domestic, industrial and agricultural sewage water. SUBSTANCE: apparatus has pneumatic aeration unit with outer and inner rings connected via distribution line to pipe of pneumatic aeration unit. Widening nozzles with small air flow flare are positioned on outer ring and widening nozzles with large air flow flare are positioned on inner ring. Nozzles are provided with curved helical grooves. Pins are made in the form of curved blades. Such construction allows supplied air to be uniformly distributed through the whole volume of granular charge of biological filter. EFFECT: increased efficiency by supplying vortex air flow and improved uniform passage of air through filter charge. 3 dwg