| 摘要 |
<p>The invention relates to a biological aerated filter. A hollow upright cylindrical tube (1, 20, 40, 60, 80, 90) is provided with an internal packing of solid support media (5, 26, 94) which provides a large surface area for supporting microbial biomass. The tube is provided with an inlet (6, 21, 41, 61, 81, 91) and an outlet (7, 22, 42, 68, 82 92) for passage of liquid waste to be treated inside the tube. An air diffuser (4, 67, 93) having a flexible multi-perforated membrane (36) is arranged at the base of the tube. In use, a stream of air bubbles is passed upwardly from the air diffuser through liquid in the tube. The membrane of the air diffuser is sealed to the lower part of the tube so as to prevent solids passing around and below the air diffuser. <IMAGE></p> |
