| 摘要 |
PCT No. PCT/GB92/00894 Sec. 371 Date Nov. 15, 1993 Sec. 102(e) Date Nov. 15, 1993 PCT Filed May 18, 1992 PCT Pub. No. WO92/20627 PCT Pub. Date Nov. 26, 1992.There is disclosed a method of treating liquid carrying suspended solids comprising the following steps: (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 within the time the said liquid is permitted to remain in the primary vessel; (ii) transferring an aqueous component comprising the flocs from the primary treatment vessel (1) 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 relative to the original liquid; wherein the liquid is subjected in the primary vessel to flow patterns, including a low energy circulating flow about a vertical axis of the primary vessel, which provide conditions for the formation of the substantially non-settleable flocs containing suspended solids from the original liquid; and wherein the aqueous component from the primary treatment vessel is subjected in the secondary vessel to flow patterns, including a low energy circulating flow about a vertical axis of the vessel, which provide conditions for rapid formation of flocs and subsequent rapid settlement thereof. |
