Internally Fed Drum

The IFD screen is an internally fed, self-cleaning screening device, versatile enough for a range of applications from municipal wastewater treatment to various industrial processes.

This equipment features a rotating drum, which can be made of either perforated plate or wedge wire, driven by a motor. The drum is supported by a frame and is housed within a stainless steel enclosure. Wastewater enters the machine through an inlet pipe located at the back (near the motor side), extending into the drum for a specific distance. At the end of this pipe, a water distributor is placed to evenly disperse water across the inner surface of the drum, ensuring optimal use of the filtering area.

To prevent clogging of the filtering media, a double washing system is installed along the top of the drum. This system includes a steel pipe with nozzles, fed from the back side of the machine. An additional washing system can be installed inside the drum, particularly recommended when the filtering mesh is very fine or the screenings are sticky.

Screenings are transported to the outlet by a screw welded inside the drum, which can vary in design (continuous screw or welded flights) depending on the application. The water outlet is positioned either at the bottom or on the lower side of the discharge tank. Screenings are expelled from the open part of the drum, opposite the inlet pipe, typically collected in a screw compactor or wash press.

The construction material options include stainless steel 304 or 316, with duplex stainless steel available upon request.

Key advantages of the IFD screen include:

• Clog-free operation.
• High flow capacity.
• Ability to handle extremely high solid contents in wastewater.
• Virtually maintenance-free.
• Easy installation.

Additionally, the unit can be customized with a control panel, available in either electromechanical or PLC-controlled formats, to suit various operational needs.