With a combination of various filter media and counter - current backwash technology, the multi - media filter achieves deep - layer water purification. Combining high - efficiency dirt interception with long - cycle operation, it becomes the mainstream equipment for water treatment in industrial and civil applications.
Multi-media filter is a process in which one or several filter media are used to pass water with high turbidity through a certain thickness of granular or non-granular material under a certain pressure, thereby effectively removing suspended chromatin and clarifying the water. The filter media are quartz sand, anthracite, manganese sand, etc., which are mainly used for water treatment and degreasing, softened water, pre-treatment of pure water, etc. The turbidity of the effluent can reach below 3 degrees.
Filtration Phase: The water to be treated enters the filter from the top and passes through multiple layers of filter media composed of anthracite, quartz sand, manganese sand, etc. Large - sized impurities are first intercepted by the coarse - grained media in the upper layer, while fine suspended solids, colloids, iron and manganese ions are further retained by the fine - grained media in the lower layer. The purified water flows out from the bottom outlet.
Differential Pressure Monitoring: The system continuously monitors the pressure difference between the inlet and outlet of the filter. When the pressure difference reaches the set threshold (e.g., 0.06MPa) or the operation time reaches the set duration (e.g., 12 - 24 hours), the backwash program is activated.
Backwash Phase:
The valve switches the water flow direction, and the backwash water enters the filter from the bottom, flushing the filter media rapidly from bottom to top.
The filter media loosens and rubs against each other due to the impact of water flow, and attached impurities are discharged from the top drain outlet with the water flow.
The backwash lasts for 5 - 8 minutes. After the filter media is cleaned, the filter returns to the normal filtration mode.
| Key Advantages | Description |
|---|
| Multi - layer Composite Filtration | A combination of 2 - 4 layers of filter media with different particle sizes and functions enables gradient purification from coarse to fine, with effluent turbidity <3NTU. |
| High - efficiency Dirt Interception | The total thickness of filter media can reach 1 - 2 meters, effectively intercepting impurities with a particle size of 5 - 100μm, increasing the dirt - holding capacity by 40% compared to single - media filters. |
| Energy - saving and Low - consumption Design | Backwash water consumption is only 2 - 3% of the treated water volume, and energy consumption is reduced by 35%, significantly saving operating costs. |
| Long Lifespan and Maintenance - free | Filter media is wear - resistant and corrosion - resistant, with a service cycle of over 5 years under normal conditions, reducing replacement frequency. |
| Flexible Customization | Supports personalized adjustment of filter media type, thickness, and backwash parameters to adapt to different raw water quality and treatment requirements. |
| Industry | Application Scenarios | Core Value |
|---|
| Municipal Water Supply | Tap water plant pre - treatment, secondary water purification | Reduces raw water turbidity and iron/manganese content, ensures residential water safety, and eases subsequent disinfection pressure. |
| Industrial Recirculating Water | Cooling tower makeup water filtration, boiler water softening | Prevents pipeline scaling and equipment corrosion, extends equipment lifespan, and improves the utilization rate of recirculating water. |
| Wastewater Treatment | Tertiary sewage treatment, pre - filtration for reclaimed water reuse | Removes suspended solids and some organic matter, creates conditions for advanced treatment, and increases water resource recovery rate. |
| Food and Beverage | Production line water filtration, brewing water purification | Ensures water quality meets food safety standards, enhances product taste and quality stability. |
How often do the filter media need to be replaced?
Under normal use, the replacement cycle of filter media is 3 - 8 years. If the filter media is contaminated due to deterioration of raw water quality, partial or overall replacement can be carried out in advance.
Does backwashing interrupt water supply?
Multi - unit parallel equipment supports alternate backwashing. When a single unit is being flushed, the remaining units operate normally, ensuring uninterrupted water supply.
How to choose the appropriate combination of filter media?
Select according to raw water quality: quartz sand + anthracite for sediment removal; add manganese sand for iron/manganese - containing water sources; use activated carbon media to reduce organic matter content.
The multi - media filter stands out as a fundamental water treatment device, thanks to its multi - layer purification technology, economic durability, and wide applicability. Whether in municipal projects, industrial production, or environmental protection, it can achieve stable and reliable water purification through standardized configurations or customized solutions. With the increasing environmental protection and energy - saving requirements, the multi - media filter will continue to optimize filter media combinations and backwash processes, providing sustainable water treatment solutions for more industries.
If you are interested in this product or have any questions, please feel free to contact us at any time.
3 Steps to Get Started
1.Click for Quote: Fill out the requirement form (est. 3 mins)
2.Dedicated Docking: Receive preliminary solution + precise quotation within 1 hour
3.Worry-Free Delivery: 7-15 days global logistics
1.Shallow sand filter
2.Bag filter
