High-Performance Internally Fed Rotary Drum Screens
Automated, self-cleaning, and highly efficient. Designed for primary wastewater treatment and industrial process water filtration. Recover valuable solids and protect downstream equipment with precision screening.
Advanced Flow In-to-Out (FITO) Separation
The Internally Fed Rotary Drum Screen is a mechanical filtration device where the influent enters the inside of the rotating drum. Solids are captured on the internal surface of the wedge wire screen and transported to the discharge end by internal flights or a screw conveyor.
This "In-to-Out" design is particularly effective for high-fat/grease wastewater and pulp recovery, as it prevents external splashing and ensures all solids are directed into the collection hopper.
Internally Fed Rotary Drum Screen
Ideal for smaller vertical vessels. Laterals radiate from a central hub, ensuring even coverage across the entire bed diameter.
Externally Fed Rotary Drum Screen
Best for large diameter vessels or horizontal tanks. A central header pipe with multiple side laterals ensures balanced flow across large surface areas.
Advanced Features
Self-Cleaning System
Integrated internal and external spray bars ensure the screen remains unclogged even with sticky or fibrous materials.
Low Operational Cost
Automatic operation with low power consumption and minimal wear-and-tear components.
Large Flow Capacity
The cylindrical design provides a massive surface area, handling higher flow rates than traditional static screens.
How It Works
Internal Feed
Wastewater enters the headbox and is distributed onto the inner surface of the rotating drum.
Filtration
Liquid passes through the wedge wire slots, while solids are retained inside.
Internal Transport
Integrated helical flights move the captured solids toward the open end of the drum.
Cleaning & Discharge
An external spray bar cleans the slots, and solids drop into a collection hopper.
Technical Specifications
Model/Parameter | Typical Range |
Drum Diameter | 600 mm – 2500 mm |
Drum Length | 1000 mm – 4000 mm |
Slot Openings | 0.25 mm to 5.0 mm |
Inlet/Outlet Size | DN100 – DN600+ |
Material | SS 304, 316L (Standard) |
Drive Power | 0.75 kW – 5.5 kW |
Applications
Pulp & Paper: Fiber recovery and wash water cleaning.
Food Processing: Screening wastewater from poultry, meat, and vegetable plants.
Municipal Wastewater: Fine screening as primary treatment to protect pumps.
Chemical Industry: Recovery of precious solid particles from process streams.
Frequently Asked Questions
Internally fed screens are better for containing odors and splashes, and they are superior for capturing light or floatable solids that might bypass an external screen.
Yes, we equip our internal screens with specialized high-pressure spray bars and hot water cleaning options specifically for grease-heavy applications.
Maintenance is minimal. Weekly inspection of the spray nozzles and monthly lubrication of the drive chain/bearings are usually sufficient.