Product Information
The microfiltration rotary disc filter is a filtration unit often used for advanced wastewater treatment. The core of a fiber rotary disc filter is a set of upright circular discs covered with microfiber cloth or fibrous filter media. In an automatic rotary disc filter, water passes through the discs and suspended solids get trapped. As the water level difference across the discs builds up, the unit automatically kicks off backwashing—no manual intervention needed. It has a small footprint and delivers great effluent quality, so it's commonly used downstream of biological tanks as a final safeguard, or as pre-treatment for water reuse.
Get a QuoteMicrofiltration Rotary Disc Filter | Fiber Rotary Disc Filter | Automatic Rotary Disc Filter
Working Principle
Water enters the tank, passes from the outside of the discs through the filter cloth into the central collection pipe, and flows out. Suspended solids are trapped on the disc surface. After running for a while, the cloth clogs, the water level inside the discs drops, or the pressure difference between the inlet and outlet hits the set point. That's when the automatic rotary disc filter starts its backwash cycle. During backwashing, some or all of the discs rotate. A backwash pump draws clear water and sprays it outward from inside the discs at high pressure, washing the debris off the surface, while a sludge valve opens to discharge the concentrated sludge. Backwash water consumption is low—usually just 1% to 3% of the total treated water.
Application Fields
1.Plant upgrades: deep filtration of secondary clarifier effluent, replacing traditional sand filters to meet Class 1A standards.
2.Membrane pre-treatment: placed ahead of UF/RO to catch fine impurities and reduce membrane fouling.
3.Industrial reuse: removing suspended solids from biologically treated papermaking and printing/dyeing wastewater to ensure reuse quality.
4.Source water: treating algae-laden or low-temperature, low-turbidity surface water to trap fine algae clusters and reduce downstream load.
FAQ
Q1: What is the typical filtration rating of a microfiltration rotary disc filter?
A: Usually around 10–20 microns, and some filter cloths can go down to 5 microns. It depends on the water quality and reuse requirements. A tighter rating gives better effluent, but you'll have to backwash more often.
Q2: Why is it called a "fiber rotary disc filter"?
A: Because the disc surface is usually wrapped in fiber filter cloth, rather than traditional metal mesh or rigid plates. The fiber cloth has a uniform pore structure, good water permeability, and a strong ability to capture fine particles.
Q3: How is backwash water supplied for an automatic rotary disc filter?
A: It's typically drawn from the clean water zone at the rear of the tank, so no external clean water source is needed. A backwash pump pressurizes the water and sprays it onto the discs through spray bars. The system usually includes pressure monitoring to keep the backwash water pressure steady.