With intelligent backwashing technology, it enables automatic cleaning and regeneration of filter elements, ensuring continuous and stable high - efficiency filtration performance. It is an ideal choice for water treatment in industrial and civil fields.
I. Product Introduction
The backwash filter is an advanced water treatment device that integrates filtration and self - cleaning functions. When the device is in operation, the water to be treated enters the filter through the inlet and flows through the filter element under pressure. Suspended solids, particulate impurities, etc. in the water are intercepted, and the purified water flows out from the outlet. When the impurities intercepted by the filter element reach a certain amount, causing an increase in the pressure difference between the inlet and outlet or when the running time reaches the set value, the device automatically starts the backwash program. It uses reverse water flow flushing or air - water combined flushing to remove the impurities on the surface and inside of the filter element, restoring the filtration performance of the filter element. There is no need for frequent manual disassembly and cleaning, which greatly improves the automation degree and convenience of the device. It is widely used in many fields such as industrial circulating water, municipal water supply, and sewage treatment.
II. Working Process
Normal Filtration Stage:
Raw Water Inflow: The raw water is driven by the water pump and enters the device from the filter inlet through the pipeline, evenly distributed to the outside of the filter element.
Impurity Interception: The water flows through the filter element from the outside to the inside. During this process, suspended solids, sediment, rust, colloids and other impurities in the water are intercepted by the filter element. The purified water is collected from the inside of the filter element to the filter outlet and transported to the subsequent water - using links.
Backwash Trigger:
Pressure Difference Trigger: As the filtration progresses, more and more impurities are intercepted on the surface and inside of the filter element, resulting in an increase in the pressure difference between the inlet and outlet of the filter. When the pressure difference reaches the set value (generally 0.05 - 0.1MPa), the system automatically triggers the backwash program.
Time Trigger: If the raw water quality is good and the pressure difference between the inlet and outlet of the filter increases slowly, when the device running time reaches the preset duration (such as 8 - 24 hours), the backwash program will also be started to ensure that the filter element is cleaned in time.
Backwash Process:
Water Flow Reversal: When the backwash starts, the inlet valve closes and the drain valve opens. The water flow direction is reversed, entering from the filter outlet or a dedicated backwash inlet and flushing at high speed from the inside to the outside of the filter element.
Impurity Removal: The high - speed reverse water flow loosens the impurities on the surface and in the pores of the filter element and discharges them with the water flow. Some models also use the air - water combined backwash method, and the scouring effect is enhanced by introducing compressed air to more thoroughly remove stubborn impurities.
Filter Element Regeneration: After a certain period of time (usually 2 - 5 minutes) of backwashing, the impurities on the filter element are effectively removed, and the good filtration performance is restored.
Restoring Filtration Stage: After the backwashing is completed, the drain valve closes and the inlet valve reopens. The device enters a short forward flushing stage to ensure that the remaining backwash wastewater is discharged, and then resumes the normal filtration state.
III. Product Features
Key Advantages | Description |
Intelligent Self - cleaning | Equipped with a differential pressure sensor and a time controller, it automatically monitors the state of the filter element and precisely triggers backwashing, realizing automatic cleaning of the filter element and reducing manual maintenance workload. |
Efficient Filtration Performance | Using high - precision filter elements, the filtration precision can reach 1 - 100 microns, with a high interception efficiency for impurities in water and stable effluent water quality. |
Water and Energy - saving Design | The backwashing water consumption is low, only 1 - 3% of the treated water volume. The optimized hydraulic structure design reduces water flow resistance, and the operating energy consumption is 20% lower than that of traditional filters. |
Long Service Life and Durability | The filter element is made of high - quality anti - pollution materials, and the housing is made of stainless steel or carbon steel anti - corrosion materials, which are corrosion - resistant and wear - resistant, with a service life of 5 - 8 years. |
Flexible Installation Adaptability | A variety of specifications and models are provided, with a water treatment capacity ranging from 5 - 1000m³/h. It supports multiple installation methods such as vertical and horizontal, and can be flexibly selected according to the on - site space and pipeline layout. |
Stable and Reliable Operation | The unique water distribution and collection system ensures uniform water flow distribution, avoids local blockage of the filter element, and ensures the long - term stable operation of the device. |
IV. Technical Parameters
Parameter Category | Specific Parameters |
Device Material | Stainless steel 304, stainless steel 316L, carbon steel lined with rubber, carbon steel sprayed with plastic |
Filter Element Material | Polypropylene (PP), polyvinylidene fluoride (PVDF), stainless steel wire mesh, ceramic, etc. |
Filtration Precision | 1μm, 5μm, 10μm, 20μm, 50μm, 100μm (customizable) |
Filter Element Size | 10 inches, 20 inches, 30 inches, 40 inches (length); outer diameter 60 - 115mm (customizable) |
Operating Pressure | ≤1.0MPa |
Operating Temperature | 5 - 60℃ |
Backwash Pressure | 0.1 - 0.3MPa |
Backwash Time | 2 - 5 minutes |
Backwash Water Consumption | 1 - 3% (of treated water volume) |
Single - unit Treatment Capacity | 5 - 500m³/h (multiple units in parallel can reach 1000m³/h) |
Inlet and Outlet Pipe Diameters | DN25 - DN300 (customizable) |
V. Application Fields
Industrial Production Field:
Iron and Steel Metallurgy: It is used for the filtration of steel rolling cooling water and blast furnace slag flushing water, removing impurities such as iron oxide scale and suspended solids in the water, preventing pipeline blockage and equipment wear, and improving cooling efficiency.
Petrochemical Industry: It filters chemical raw material liquids and circulating cooling water, intercepts impurities such as catalyst particles and oil stains, ensures the stable operation of the production process, and reduces equipment failures.
Power Industry: It filters the circulating cooling water and boiler makeup water of power plants, prevents impurities in the water from causing scaling of condensers and blockage of boiler pipes, and ensures the safe operation of the units.
Municipal Water Projects:
Waterworks: As a raw water pretreatment or clean water filtration device, it removes impurities such as sediment, algae, and colloids in the water, improving the quality of the treated water.
Sewage Treatment Plants: In the advanced sewage treatment process, it filters the residual suspended solids, making the effluent meet the reuse standards for municipal miscellaneous use, landscape water replenishment, etc.
Agricultural Irrigation Industry:
Drip Irrigation and Sprinkler Irrigation Systems: It filters impurities such as sediment and organic matter in irrigation water, prevents the blockage of drip heads and sprinkler heads, ensures uniform irrigation, and improves irrigation efficiency.
Aquaculture: It purifies the circulating water in aquaculture ponds, removes pollutants such as feces and uneaten bait in the water, improves water quality, and creates a good environment for aquaculture.
Commercial and Civil Buildings:
Central Air - Conditioning Systems: It filters the impurities in chilled water and cooling water, prevents the scaling of heat exchangers, improves the energy efficiency of air - conditioning systems, and extends the service life of equipment.
Community Secondary Water Supply: It ensures the quality of residents' domestic water and removes rust, sediment and other impurities that may exist in the pipes.
VI. FAQ
How to determine the backwash frequency of the backwash filter?The backwash frequency is determined by the raw water quality, water treatment volume, and filtration precision. When the raw water contains more impurities, the water treatment volume is large, or the filtration precision is high, the backwash frequency will increase; otherwise, it will decrease. Generally, the backwash can be automatically triggered by pressure difference setting (such as 0.05 - 0.1MPa) or time setting (8 - 24 hours), and it can also be manually adjusted according to the actual operation situation.
If you are interested in this product or have any questions, please feel free to contact us at any time.
VIII. Related Products
Basket filter
https://www.le-filter.com/wastewater-treatment/basket-filter/
High flow filter element
https://www.le-filter.com/water-filter-element/high-flow-filter/
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