A Rotary Drum Screen, also known as a rotary sieve or drum filter, is a mechanical screening device used for separating solid particles from liquids in various industrial applications. It consists of a rotating drum with perforated or wedgewire screens. Here's how a Rotary Drum Screen works:
Inlet Flow: The liquid with suspended solid particles enters the Rotary Drum Screen through an inlet pipe or channel. This liquid can be wastewater, industrial effluent, or any fluid requiring solids separation.
Rotating Drum: Inside the Rotary Drum Screen, there is a cylindrical drum. This drum is mounted horizontally or at a slight incline. It is open on one end and is equipped with fine perforations or wedgewire screens along its length. The size and spacing of the openings can be customized to suit the specific screening requirements.
Rotation: The drum is set into motion by an electric motor or hydraulic system, causing it to rotate continuously. As the drum rotates, the liquid within it is lifted and tumbles as it moves along the length of the drum.
Screening and Separation: The suspended solid particles in the liquid are subjected to gravity and centrifugal force. Larger solid particles that cannot pass through the openings in the drum remain inside the drum and are eventually discharged at the opposite end, usually into a separate collection area or conveyor.
Clean Liquid Discharge: The liquid, now separated from the solid particles, passes through the perforations or screens on the drum. This "clean" liquid is discharged through the open end of the drum, typically into a separate collection area or a downstream treatment process.
Cleaning Mechanism: To prevent the screens from becoming clogged with solid particles over time, most Rotary Drum Screens are equipped with a cleaning mechanism. This mechanism can include brushes, spray nozzles, or blades that continually clean the screens during operation, ensuring a consistent flow of clean liquid.
Adjustable Speed and Angle: The Rotary Drum Screen's performance can be adjusted by controlling the rotation speed of the drum and the angle of inclination. Slower drum speeds may be used for more precise separation, while faster speeds increase throughput.
Rotary Drum Screens are widely used in various industries, including wastewater treatment, food processing, pulp and paper manufacturing, and more. They are valued for their efficiency in separating solid particles from liquids, helping to purify water, recover valuable resources, and reduce environmental impact. The cleaning mechanism incorporated in these screens ensures continuous and reliable operation.