| 摘要 |
<p>The device comprises a tubular element (12) having at its ends first and second enlarged portions (13, 14). Within the first enlarged portion (13) is located a neck-like element (15) adapted for connection to a sewage circulation conduit and placed concentrically within a second tubular element (20) defining an air intake (22). Openings (19) are provided in the lateral surface (17) of the portion (13) to enable air to be introduced into the tubular element (12) to blend with sewage flowing through the neck-like element (15).</p> |
