公开(公告)号：DE2712414A1

公开(公告)日：1978-09-28

申请号：DE2712414

申请日：1977-03-22

Applicant: BASF AG

Inventor： DAUCHER HANS DIPL ING DR ,  DRESSEL MANFRED DIPL ING ,  HESS KLAUS DIPL ING DR ,  ENGELHARDT HUBERT DIPL ING

IPC: B01D21/34 ,  B01D29/00 ,  B01D29/01 ,  B01D29/05 ,  B01D33/073 ,  B01D37/00 ,  B01D29/04 ,  C02C1/22

Abstract: A process and apparatus for removing suspended matter from suspensions by filtering through foams, in which the suspended matter retained in the foam (polyurethane foam produced by foaming with water vapor being preferred) is substantially flushed out by expressing the liquid held in the foam, and is removed as a concentrate. This for the the first time permits the removal of suspended matter from continuously flowing suspensions without the flow of the suspensions having to be interrupted in order to clean the filtering means.

公开(公告)号：DE2637108A1

公开(公告)日：1978-02-23

申请号：DE2637108

申请日：1976-08-18

Applicant: BASF AG

Inventor： ENGELHARDT HUBERT DIPL ING ,  GLEICH WOLFGANG ING GRAD ,  KUERTEN HERIBERT DIPL ING DR ,  LEIB HEINZ DIPL ING ,  NAGEL OTTO DIPL ING DR ,  ZEHNER PETER DIPL ING DR

IPC: C02F3/12 ,  C02F3/14 ,  C02F3/16 ,  C02C1/10

Abstract: The immediate spray area of the stirrer is protected with a dome having 2-6 (pref. 2.5-4) times the stirrer's diameter. The air stream which is carried along by the dome's walls which dip into the liquid, pref. in the form of fine bubbles, is 0.05-2 times (pref. 0.2-0.5 times) the water stream agitated by the stirrer. The activated sludge is also kept in suspension. Only the immediate stirrer area of the tank need be covered. Pref. the moment of the stirrer and dome is 1.5-3 times that of an unprotected stirrer at the same depth of immersion and speed of rotation.