| 摘要 |
<p>1356842 Sedimentation tank EBARA INFILCO KK 26 May 1971 [15 June 1970] 17310/71 Heading B1D A suspension-clarifying apparatus comprises a tank 1 containing flocculation chamber 6 into which incoming suspension is fed from inlet pipe 13, the flocculation chamber being divided by a number of partitions 5 which define a long narrow flow path within the chamber, means being provided to vary the length of the flow path to maintain the time of flow therealong constant irrespective of the flow rate. The flocculation chamber has an outlet which communicates with a distribution chamber 7 which itself has a plurality of outlets 8, each of which communicates with the bottom of a respective one of a plurality of floc settling chambers 3 which may be in the form of pits. Flow occurs upwards through each chamber to form a floc mass therein, which floc mass overflows at a predetermined level into a sludge chamber 9. Clarified liquid leaves by perforated pipes 31 and annular outlet channel 23, the level of the outlet being below the level of the inlet to the flocculation chamber. Numerous different forms of flocculation chamber flow path are described in which liquid flow may be alternately upwards and downwards, or in opposing horizontal directions or spirally inward or outward. The means to vary the length of the flow path may be valves operable to open the lower portion of each passage, one valve member being adapted to co-operate with valve seats on a plurality of adjacent passages or alternatively at least some of the partitions may be removable or comprise removable sections to allow flow short circuiting. The sludge chamber 9 may be defined by an inner annular wall 2 as shown in Fig. 1 or a plurality of such chambers may be formed at the sides or corners of the tank 1 (Figs. 8-11 and 14-17 not shown). In the embodiment of Fig. 1, a rotable scraper 14 moves sludge into outlet 25 from whence it is removed by conduit 12. The clarifier also comprises a drain tube (32, Fig. 2 not shown) for the flocculation chamber, and means (35) for feeding chemicals to the chamber 6.</p> |
