Today two sets of Internal Feed Rotary Drum Filter Screen were delivered to Brazil.
Drum Filter Internal Feed Screen is an automated equipment that injects sewage from the inside of a rotating filter cartridge by gravity/pump pressure, and achieves solid-liquid separation through stainless steel or engineering plastic filters. The mainstream model has a filtration accuracy of ≥ 0.2mm and is suitable for aquaculture, industrial wastewater, and reclaimed water reuse scenarios.
Drum Filter (also known as Rotary Drum Filter or rotary drum filter screen) is a mature and efficient solid-liquid separation equipment in the current water treatment field, widely used in the pretreatment process of aquaculture wastewater, food processing, chemical industry, papermaking and other industries. Its core design is different from the "external inlet" model - sewage is evenly distributed inside the filter cartridge, suspended particles (≥ 0.2mm) are intercepted by the filter screen, clean water is discharged through the screen, and the dirt is pushed to the slag discharge outlet by the slag guide screw. This structure can better maintain solid integrity, improve retention rate, and support fully automatic backwashing and anti blocking.
Core structure and working principle
Water inlet method: divided into two mainstream modes.
Post pump pressure type: The water pump is directly connected to the inlet, but it is prone to crushing soft impurities such as fish manure, reducing filtration efficiency and slightly increasing energy consumption.
Self flowing (gravity type): The recommended solution relies on the natural inflow of water level differences, retaining the original form of impurities, saving energy, and having a higher retention rate. The system needs to adopt an underground/stepped layout.
Key components:
Rotating filter cartridge (material: 304/316 stainless steel or UPVC/HDPE engineering plastic).
Built in slag guide screw (synchronous rotation, forced discharge).
Backwash spray system (to prevent filter clogging).
Anti overflow board and automatic control system (including real-time display of turbidity, flow rate, etc. on LCD screen)
Selection and application suggestions
Priority selection from flow type and stainless steel body: Especially in high organic load scenarios such as aquaculture and slaughter wastewater, it can significantly improve the retention rate of large particles such as fish manure, hair, and residual bait.
Pay attention to backwash configuration: Without this function, it is easy to cause clogging of the filter screen, which affects the stability of continuous operation.
Customized requirements are clear: external dimensions, filtering area, motor power, and control interface (such as whether PLC networking is required) should be communicated with the manufacturer's technical team in advance.
Attention to matching: It is recommended to use it in conjunction with a sedimentation tank/sieve bin to form a two-stage pretreatment of "gravity settling+microfiltration", which extends the service life of the microfiltration machine.
