| 摘要 |
An apparatus for filtering and/or treating liquid comprises a chamber (10) having a horizontal screen (14) and a quantity of granules (22) below the screen, the granules having a specific gravity less than unity. Liquid to be filtered and/or treated is passed upwards through the chamber, from an inlet (12) to an outlet (18); treating fluid (e.g. ozone) is diffused into the liquid at (19, 20). The granules are backwashed by passing liquid through the chamber in the opposite direction. |
