The Automatic Backwash Disc Filter (also known as a disc-type filter) is a highly efficient, intelligent solid-liquid separation system designed for modern water treatment.
At its core are stackable, engineered-plastic ring discs featuring micron-level grooves on both sides. When compressed tightly by a combination of spring force and hydraulic pressure, these intersecting grooves create a dense network of deep-bed filtration channels. This structure delivers a total filtration depth equivalent to approximately 30 layers of standard mesh screens.
Equipped with an advanced electronic control system, the unit automatically transitions between filtration and backwashing modes, enabling fully automated, 24/7 continuous operation without requiring manual supervision.
The system operates seamlessly across two distinct, automatically controlled phases:
Filtration Mode: Raw water enters from the outer edge of the disc stack. Suspended solids and impurities are trapped within the intersecting contact points of the grooved discs, while clean water flows out through the central outlet. As differential pressure increases, the discs compress even tighter, ensuring highly stable and consistent filtration accuracy.
Backwash Mode: When the differential pressure (DP) or preset time interval reaches its threshold, the backwash cycle triggers automatically. The control valves redirect the water flow, releasing the spring tension to loosen the disc stack. Simultaneously, internal tangential nozzles blast high-pressure water streams, driving the discs to spin at high speeds. The combined action of hydraulic shearing and centrifugal force thoroughly flushes out trapped particles, discharging them through the drain outlet.
Efficiency Note: A single backwash cycle takes only 5 to 20 seconds and consumes less than 0.5% of the total water volume. Once complete, the valves reset, the discs re-compress, and filtration resumes instantly.
3. Core Advantages: Leading Technology, Superior Value
Precision Filtration with Flexible Options: Offers a wide range of filtration ratings from 20 μm to 400 μm to suit diverse application requirements.
Fully Automated & Continuous Water Flow: The multi-unit parallel configuration allows individual units to backwash sequentially. This ensures uninterrupted water supply to the downstream system 24 hours a day.
High Water Savings & Low Energy Consumption: The intelligent backwash system triggers only on demand rather than at fixed time intervals. Following a system upgrade at a major chemical plant, annual operation and maintenance (O&M) costs dropped by 42%.
Modular Design & High Footprint Efficiency: Modular units can be flexibly combined to match your scaling needs. A system with a capacity of 300 m³/h requires a footprint of only about 6 m².
Exceptional Durability & Maintenance-Free: Made from high-quality, corrosion-resistant, and wear-proof engineering plastics, the discs boast a design lifespan of up to 15 years with virtually zero daily maintenance required.
4. Application Scenarios: Empowering Global Industries
Modern Agricultural Irrigation: Precision-filters sand, silt, organic matter, and algae from the source, protecting micro-sprinklers and drip irrigation emitters. Pilot data reveals that drip emitter clogging dropped by over 90%, extending overall system lifespan by 3 times.
Industrial Cooling Tower & Loop Water: Effectively removes mechanical impurities, protecting critical equipment like pumps and valves, and extending overall system service life by more than 30%.
Municipal Water & Wastewater Treatment: Widely used in municipal water supply networks, wastewater treatment facilities, and water reclamation/reuse plants.
Industrial Process Water: Plays a critical role in process water and washing systems across the power generation, chemical, pharmaceutical, food & beverage, and pulp & paper industries.
The global filtration equipment market is experiencing rapid growth, projected to rise from $15.86 billion in 2025 to $22.88 billion by 2031.
Specifically, the global automatic backwash disc filter market reached $114 million in 2024 and is expected to grow to $145 million by 2031. Driven by worldwide mandates for efficient water resource management and environmental protection, disc filters are positioned for robust global adoption thanks to their high efficiency, water-saving design, and smart automation.
Conclusion
With its precision-engineered filtration technology, intelligent automation, and proven economic returns, the Automatic Backwash Disc Filter has become an indispensable asset in modern water treatment. Choosing our disc filtration system means investing in high efficiency, operational reliability, and a sustainable future.
For technical specifications, customized configurations, or project inquiries, please feel free to reach out to our engineering team.
