03/11/2025
The operation of a rotary drum filter is a continuous cycle, which can be divided into the following steps:
Inlet and Filtration:
The wastewater to be treated enters the drum from the inlet end (usually the center or one side of the drum).
Under gravity, the water passes through the screen surrounding the drum and flows out as filtered water.
Suspended solids larger than the screen mesh size (such as fibers, paper scraps, bioflocs, etc.) are trapped on the inner surface of the screen.
Cake Lifting:
As the drum slowly rotates, the filter cake trapped on the inner surface is lifted to the surface.
Washing and Discharge:
When the drum carrying the filter cake rotates to a specific position, it is washed by a reverse jet of water from the flushing nozzles installed at the top.
High-pressure water (usually filtered water) washes the filter cake off the screen and it falls into the cake collection trough (or screw conveyor) inside the drum.
Cake Discharge:
The collected filter cake is transported out through the cake collection trough or screw conveyor for further treatment or disposal. Continuous Operation:
The cleaned screen rotates back into the water, starting a new filtration cycle, thus achieving fully automatic and uninterrupted operation.
Key Features and Advantages:
Continuous Operation, High Degree of Automation: No need for backwashing; can operate 24/7.
Compact Structure, Small Footprint: Particularly suitable for applications with limited space.
High Filtration Accuracy: Wide range of screen apertures, typically from 20 microns to several millimeters, selectable according to requirements.
Low Head Loss: Primarily relies on gravity filtration, resulting in low energy consumption.
Low Operating Costs: Besides the small amount of electricity consumed by the pump and drive motor, the main energy consumption is flushing water, typically only 1-3% of the treated water volume.
Strong Resistance to Shock Loads: Adaptable to fluctuations in water quality and volume.
