TUBULAR AERATION ELEMENT FOR FINE-BUBBLE AERATION Russian patent published in 2006 - IPC C02F1/74 C02F3/20 B01F3/04 

FIELD: water treatment.

SUBSTANCE: invention relates to liquids aeration technology and can find use in waste water oxygen saturation processes at biological treatment plants or for oxygen saturation of oxygen-depleted waters. Tubular aeration element according to invention contains framework and dispersing layer. All of the element is formed by thermoplastic polymer fibers melted with each other in contact sites owing to heat accumulated in the fibers. Framework is an inner layer 4 mm thick made from fiber 400-500 μm in diameter laid at density 0.38-0.42 g/cm³. Outer dispersing layer is made from fibers having diameter not larger than 50 μm and laid at density 0.54-0.57 g/cm³. Thickness of aeration element can be constant, maximal along its length, and can be diminished owing to outer dispersing layer by 0.5 mm on 1 m length but no more than by 40% of maximum thickness of this layer. In all cases, thickness of dispersing layer cannot be less than 4 mm.

EFFECT: enabled creation of structurally simple aeration elements to achieve uniform exit of air bubbles throughout length of the string of aeration elements and simplified aeration element manufacture process.