| 摘要 |
The invention relates to a submersible diffuser 30 for aeration of a body of water which may for example be a fresh water environment such as a pond, lake or river, or a sea water environment such as a coastal bay. The diffuser comprises a flexible gas diffusion membrane 42 having multiple openings 44 for release of gas. The diffusion membrane defines a plenum chamber (36, Fig. 3) having an inlet 38 for supply of pressurised gas and is carried upon a base 32. The gas diffusion membrane has a pre-formed non-flat shape by virtue of which it is able to adopt (i) a first configuration in which the diffusion membrane is outwardly convex and (ii) a second configuration in which the diffusion membrane is outwardly concave, and to make a reversible transition between the first and second configurations in response to variation of gas pressure in the plenum chamber. A method of aerating a body of water by submerging at least one diffuser in the body of water is also claimed. |
