| 摘要 |
<p>Foam typically forms in a receiving tank (10, 110) from either the underflow or overflow from a gas sparged hydrocyclone (12). Particularly in processing of paper pulp to deink the pulp or to remove sticky contaminants from it, the foam in the receiving tank has many undesirable materials which are preferably removed. Foam from the receiving tank (10) is removed with a vacuum box (29) or an overflow weir. To facilitate concentration of the foam, the discharge of fluent material from the bottom (27) of the receiving tank is preferably via a tangential discharge line (26) so that a swirling action takes place in the tank and the foam collects near the cylindrical side wall (24) of the tank. The foam may be removed by vacuum caused by a blower 32), and the foam and entrained liquid is separated from the air (at 34) before the air reaches the blower. The foam and entrained liquid may be dewatered, or compounds therein having a high BOD and COD load are separated. An alternative construction of receiving tank (110) includes a gas introduction device (51) at one side portion causing gas to blow foam toward an opposite side portion to a foam outlet (58), with a liquid spray (from 59) for breaking foam bubbles at the outlet. A generally horizontal baffle (55), and optional vertical baffles (53, 56), prevent short circuiting of fluent material from an inlet (123) to the fluent material outlet (126) of the tank. <IMAGE></p> |
