An apparatus and method are provided that enable the control of a screening operation based on a calculated screen blockage percentage and the velocity throughput of the screen. The apparatus includes an upstream level detector, a downstream level detector and flume or weir placed downstream of the screen. The apparatus may further include a blockage determination unit which determines the percent screen blockage based on the flow level upstream of the screen and the flow level downstream of the screen.

An apparatus and method are provided that enable the control of a screening operation based on a calculated screen blockage percentage and the velocity throughput of the screen. The apparatus includes an upstream level detector, a downstream level detector and flume or weir placed downstream of the screen. The apparatus may further include a blockage determination unit which determines the percent screen blockage based on the flow level upstream of the screen and the flow level downstream of the screen.

The invention relates to a conveyor belt filter device for mechanically cleaning a liquid which flows through a channel and is polluted with solids, comprising an endless filter belt of interconnected flat filter elements which can be pivoted against one another, and a flexible driving means which is guided over a lower deflection device and at least one upper deflection device and comprising a framework which carries the deflection devices and the filter belt, wherein in the area of the upper deflection device a wiper device is arranged which can be driven to rotate and is arranged on a swinging link which is mounted on the framework, the wiper device being supported against the weight of the wiper device by a support device, and the support device being arranged together with the upper deflection device on a common carrier which is adjustable with respect to the framework.

The invention relates to a conveyor belt filter device for mechanically cleaning a liquid which flows through a channel and is polluted with solids, comprising an endless filter belt of interconnected flat filter elements which can be pivoted against one another, and a flexible driving means which is guided over a lower deflection device and at least one upper deflection device and comprising a framework which carries the deflection devices and the filter belt, wherein in the area of the upper deflection device a wiper device is arranged which can be driven to rotate and is arranged on a swinging link which is mounted on the framework, the wiper device being supported against the weight of the wiper device by a support device, and the support device being arranged together with the upper deflection device on a common carrier which is adjustable with respect to the framework.

A rake classifier assembly including an elongate rake member reciprocally movable up an inclined surface to move solid material thereup is described. A pair of guide arrangements are provided each with a pivotally mounted elongate guide track along which respective wheels connected to the elongate rake member are movable. The guide tracks are selectively movable between first and second alignments, with the guide tracks extending substantially parallel to the inclined surface in the first alignment such that the elongate rake member can be moved up the inclined surface moving solid materials thereup, and in the second alignment the guide tracks diverge downwardly away from the inclined surface, such that as the elongate rake member is moved downwardly the elongate rake member also moves away from the inclined surface.

A rake system and method may include a framework, a chain, an elongated rail, a support arm, and an engagement feature. The elongated rail may be pivotably connected to the framework. The support arm may be connected to the elongated rail at a first point and may be pivotably connected to the framework at a second point. The engagement feature may be connected to the support arm and may be configured to engage the chain. The rake system may be configured to discard debris.

A rake system and method may include a framework, a chain, an elongated rail, a support arm, and an engagement feature. The elongated rail may be pivotably connected to the framework. The support arm may be connected to the elongated rail at a first point and may be pivotably connected to the framework at a second point. The engagement feature may be connected to the support arm and may be configured to engage the chain. The rake system may be configured to discard debris.

Rake systems for cleaning water streams and new and novel components for such rake systems.

A seal for preventing the bypass of solids from a filter screen assembly that can be used in water and wastewater treatment. The seal can include an L-shaped bracket and a housing that can include a channel-shaped member. A first panel of the L-shaped bracket can be inserted into a groove of a belt of the filter screen assembly so as to fill that groove. The belt can be insertably received into a channel recess of the channel-shaped member of the housing. A second panel of the L-shaped bracket can be fastened to one side wall of the channel-shaped member. By securing the L-shaped bracket to the channel-shaped member of the housing, a track is formed for slidably engaging the belt during its rotational movement. The belt's contact with the first panel of the L-shaped bracket inserted into the belt's groove forms a tight, continuous seal.

A seal for preventing the bypass of solids from a filter screen assembly that can be used in water and wastewater treatment. The seal can include an L-shaped bracket and a housing that can include a channel-shaped member. A first panel of the L-shaped bracket can be inserted into a groove of a belt of the filter screen assembly so as to fill that groove. The belt can be insertably received into a channel recess of the channel-shaped member of the housing. A second panel of the L-shaped bracket can be fastened to one side wall of the channel-shaped member. By securing the L-shaped bracket to the channel-shaped member of the housing, a track is formed for slidably engaging the belt during its rotational movement. The belt's contact with the first panel of the L-shaped bracket inserted into the belt's groove forms a tight, continuous seal.