Relying on quartz sand filter layers and counter - current backwash technology, the shallow sand filter achieves high - flow, high - precision filtration. Combining low - cost operation and long service life, it becomes the mainstream equipment for industrial and municipal water treatment.
Shallow sand filter is the sand cylinder unit consists of one or more standard, it has unique water distribution and collection of water, has a unique automatic flush valve, which can realize multiple standards high in normal system operation sand cylinder one by one single back flush, automatic process control.Has the backwash water consumption is small, convenient installation, easy operation, etc; The equipment is large flow, no maintenance; According to different user requirements, there are vertical and horizontal two series, is suitable for the water quality in the field of multiple processing requirements.
Filtration Phase: The water to be treated enters the filter from the top and passes through the uniformly laid quartz sand filter layer from top to bottom. The pores of the sand bed intercept suspended solids, colloids, and other impurities in the water, and 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., 0.05MPa) or the operation time reaches the set duration (e.g., 8 - 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 quartz sand filter layer rapidly from bottom to top.
The sand layer loosens 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 3 - 5 minutes. After the sand bed is cleaned, the filter returns to the normal filtration mode.
| Key Advantages | Description |
|---|
| High - efficiency High - flow Filtration | Single - unit processing capacity ranges from 10 - 500m³/h, suitable for large - scale continuous water treatment scenarios. |
| Deep Dirt - intercepting Ability | The quartz sand filter layer forms a gradient pore structure, effectively intercepting impurities with a particle size of 5 - 500μm, and the effluent turbidity is <5NTU. |
| Low - consumption Energy - saving Design | Backwash water consumption is only 1 - 3% of the treated water volume, and energy consumption is reduced by 40%, significantly saving operating costs. |
| Long - life Maintenance - free | Quartz sand 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 multi - unit parallel expansion, and filter layer thickness and backwash parameters can be adjusted according to water quality requirements. |
| Industry | Application Scenarios | Core Value |
|---|
| Municipal Engineering | Tap water plant pre - treatment, primary sewage filtration | Reduces raw water turbidity, lightens the load of subsequent treatment, and ensures water supply safety and sewage treatment efficiency. |
| Industrial Recirculating Water | Cooling tower makeup water filtration, steel plant turbid water purification | Prevents pipeline scaling and equipment blockages, extends equipment lifespan, and improves the utilization rate of recirculating water. |
| Agricultural Irrigation | Drip irrigation system water purification, reservoir water quality improvement | Removes sediment, algae, and other impurities, protects irrigation equipment, and improves crop irrigation quality. |
How often does the quartz sand filter media need to be replaced?
Under normal use, the replacement cycle of quartz sand filter media is 5 - 8 years. If the filter media is contaminated due to water quality deterioration, 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 adjust the backwash frequency?
It can be set by adjusting the pressure difference threshold (0.03 - 0.08MPa) or timing cycle (4 - 24 hours). It is recommended to adjust flexibly according to actual water quality fluctuations.
The shallow sand filter stands out as a fundamental water treatment device, thanks to its high - efficiency filtration performance, economic durability, and wide applicability. Whether in municipal water supply, industrial circulation, or agricultural irrigation, it can achieve stable and reliable water purification through standardized configurations or customized solutions. With the increasing environmental protection and energy - saving requirements, the shallow sand filter will continue to optimize its technology, providing sustainable water treatment solutions for more industries.
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