A rotary pressure filter apparatus, a sealing device for use with the rotary pressure filter apparatus, and a process of using the apparatus. The rotary pressure filter apparatus is designed to treat a solid-liquid mixture under pressure in successive work zones. A rotary drum moves compartments containing the solid-liquid mixture through the successive zones. The zones are separated by a sealing member, which is designed to reduce pressure fluctuations as the compartments enter a successive zone.

A rotary pressure filter apparatus, a sealing device for use with the rotary pressure filter apparatus, and a process of using the apparatus. The rotary pressure filter apparatus is designed to treat a solid-liquid mixture under pressure in successive work zones. A rotary drum moves compartments containing the solid-liquid mixture through the successive zones. The zones are separated by a sealing member, which is designed to reduce pressure fluctuations as the compartments enter a successive zone.

A pulp-filter arrangement (1) comprises a rotatable drum (10) and a non-rotating valve arrangement (30). The rotatable drum (10) has a cylindrical water-permeable pulp-supporting shell (14), a plurality of drain pipes (16) and a rotating hollow shaft (18). The plurality of drainpipes (16) connects the rotating hollow shaft (18) with a collecting channel (22) situated radially directly inside the cylindrical water-permeable pulp-supporting shell (14). The non-rotating valve arrangement (30) is disposed within the rotating hollow shaft (18) for sealing off the rotating hollow shaft (18) from a radially inner outlet (24) of the drain pipes (16) when respective radially inner outlet (24) is situated within a sealed zone. The non-rotating valve arrangement (30) is further arranged to, in a transition zone immediately following the sealed zone, open a throttled passage between the rotating hollow shaft (18) and the radially inner outlet (24).

In a rotary drum for thickening pulp, the rotary drum may include drainage channels for delivering filtrate from a pulp mat on the rotary drum to a filtrate chamber at an end of the rotary drum, and includes a flat face valve and plenum chamber assembly in the filtrate chamber. The flat face valve can be juxtaposed against drainage outlets of the drainage channels, wherein the flat face valve does not block the drainage outlets during a majority of the rotation of the rotary drum. An opening on the flat face valve may extend through the front surface and be aligned with the drainage outlets to provide a fluid passage through the flat face valve and to a plenum chamber behind the flat face valve such that air in the filtrate is collected in the upper portion of the plenum chamber and removed from the rotary drum.

In a rotary drum for thickening pulp, the rotary drum may include drainage channels for delivering filtrate from a pulp mat on the rotary drum to a filtrate chamber at an end of the rotary drum, and includes a flat face valve and plenum chamber assembly in the filtrate chamber. The flat face valve can be juxtaposed against drainage outlets of the drainage channels, wherein the flat face valve does not block the drainage outlets during a majority of the rotation of the rotary drum. An opening on the flat face valve may extend through the front surface and be aligned with the drainage outlets to provide a fluid passage through the flat face valve and to a plenum chamber behind the flat face valve such that air in the filtrate is collected in the upper portion of the plenum chamber and removed from the rotary drum.

In a water treatment system, which may be a wastewater treatment plant, a single-inlet drum screen is installed with its rotation axis perpendicular to the pattern of flow in a channel. Retrofitting of an existing screening system with a different form of screen, residing in an existing concrete channel is described.

A rotary pressure filter apparatus, a sealing device for use with the rotary pressure filter apparatus, and a process of using the apparatus. The rotary pressure filter apparatus is designed to treat a solid-liquid mixture under pressure in successive work zones. A rotary drum moves compartments containing the solid-liquid mixture through the successive zones. The zones are separated by a sealing member, which is designed to reduce pressure fluctuations as the compartments enter a successive zone.

A rotary pressure filter apparatus, a sealing device for use with the rotary pressure filter apparatus, and a process of using the apparatus. The rotary pressure filter apparatus is designed to treat a solid-liquid mixture under pressure in successive work zones. A rotary drum moves compartments containing the solid-liquid mixture through the successive zones. The zones are separated by a sealing member, which is designed to reduce pressure fluctuations as the compartments enter a successive zone.

A process for the separation of the components of a solid/liquid mixture. The process Includes the use of a rotary pressure filter apparatus having improved capacity.

A process for the separation of the components of a solid/liquid mixture. The process Includes the use of a rotary pressure filter apparatus having improved capacity.