| 摘要 |
A method of treating liquid carrying suspended solids, e.g. sewage, comprises: (i) introducing the liquid into a primary treatment vessel 1 and causing agglomeration of solids suspended in the liquid to form flocs which are not settleable to any substantial degree; (ii) transferring an aqueous component comprising the flocs from the primary treatment vessel to a secondary treatment vessel 5 where a floc of a settleable nature is caused to form; and (iii) permitting said floc to settle under gravity in the secondary vessel 5 and recovering an aqueous component having a substantially reduced concentration of suspended solids; wherein the liquid in each vessel is subjected to a low energy circulating flow about a vertical axis. <IMAGE> |
