Today several sets of Internal Feed Rotary Drum Filter Screen were delivered to Russia.
Drum Filter Internal Feed is a solid-liquid separation equipment that allows sewage to enter from the inside of a drum, filter through stainless steel microporous screens, and flow out through the gaps in the drum wall. It achieves continuous mechanical separation of "internal inlet and external filtration" and is widely used for suspended solids interception and water purification in industries such as aquaculture, papermaking, and food.
Internal inflow "refers to sewage that does not directly impact the outer surface of the filter screen, but flows smoothly and evenly into the rotating drum through a buffering water tank or overflow weir water distributor, and then passes through the gaps of the filter screen to discharge clean water under the action of gravity and shear force; And the solid particles are trapped in the cylinder and transported to the slag discharge end with the spiral guide plate for automatic discharge. This design significantly reduces head loss (only 0.2-0.3 m), avoiding the problems of blockage and high energy consumption caused by traditional external water inlet methods.
Working principle and structural key points of rotary drum filter screen
Inlet method: Sewage flows through the inlet pipe → buffer tank/overflow weir → evenly distributed on the inner wall of the rotating filter cartridge, forming a stable water film;
Filtering mechanism: The water flow generates relative shear motion with the rotating filter cartridge, and the stainless steel mesh with a mesh size of 80-200 mesh per square inch (approximately 75-150 μ m) intercepts suspended particles of ≥ 0.2 mm;
Slag discharge method: The spiral guide plate inside the cylinder rolls and pushes the trapped waste to the outlet end, where it falls into the slag collection tank;
Self cleaning guarantee: The external high-pressure backwash pipe (3 kg/cm ²) sprays in a fan shape, unclogging the filter screen in real time to ensure continuous operation without interruption.
The essence of an internal water inlet microfilter is a drum type screen separation device with "internal inlet and external filtration". Its core value lies in achieving efficient interception of small suspended solids above 0.2 mm with low head loss, coupled with fully automatic backwashing, which is particularly suitable for industrial and aquaculture scenarios that require continuous operation, high water quality requirements, and focus on operating costs. If used in aquaculture, it can significantly reduce turbidity and ammonia nitrogen load caused by algae, residual feed, feces, etc.
