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1. Introduction to shallow sand filter
Shallow sand filter, also known as automatic shallow sand filter, the system is composed of multiple standard high-speed sand tank units, which are equipped with a unique water distributor and water collector, and a unique two-way automatic flushing valve. In the normal system operation, multiple standard high-speed sand tanks are individually backwashed one by one, and fully automatic program control is realized. It has the advantages of small backwash water consumption, convenient installation of equipment, and easy operation. The equipment has a large flow rate and requires no maintenance. According to different user requirements, there are two series of vertical and horizontal. Suitable for water quality treatment in industrial and civil circulating water systems
2. Characteristics of shallow sand filter
1. Small size, easy installation and space saving. It can be installed outdoors without building a house, saving soil and construction costs, with a very small footprint, and can be installed indoors and outdoors, or installed in layers, with strong adaptability; compact structure, space saving, good anti-corrosion performance, and both indoor and outdoor installations
2. The equipment has good anti-corrosion performance and long service life.
3. Large amount of filtered water, good filtering effect, fast filtering flow rate, the normal filtering speed can be about 40m/h, according to the water quality up to 60m/h; the filter is backwashed with product water, and there is no need to set up a booster pump and a backwash pump ; The backwash lasts 2-3min, and the backwash water volume is 4. Automatic backwashing: The backwashing of the equipment is automatically identified and controlled by the intelligent control system without manual intervention. Even if the suspended solids in the water fluctuate, the equipment may automatically adapt
5. The water supply is uninterrupted; when the equipment is backwashed, the filtering process is carried out at the same time, and the system supplies water as usual.
6. Adopting unique cloth and water collecting device. Due to the unique water distribution system and very evenly distributed water collecting device of the filter system, the water flow is laminar flow throughout the filtering process, and the filter sand bed plane is always flat during the filtering process. Stable water quality
7. Use refined and optimized quartz sand or garnet as the filter medium, and choose according to the water quality. The minimum particle size of the filter material can be a homogeneous filter material of 0.16mm.
8. Long-term operation costs are low, saving electricity, water, and maintenance costs. Power saving: The system has a unique automatic backwashing valve. The backwashing of the sand filter tank is not carried out at the same time, but it is backwashed one by one under the normal operation of the system. There is no need to consider setting up a backwash pump. At the same time, compared with other sand filter equipment, the required filter pump lift is 6-7m lower.
Water saving: Because of its unique water replenisher and water collector, the system has a unified tank body, so that the medium layer can be expanded evenly for effective backwashing without the need for compressed air during backwashing. The water used for backwashing is filtered clean water, so the amount of backwashing water consumed is small. The backwash water volume of a single tank is only 1m3/min, and the backwash time is 2-3 minutes
Save maintenance costs: The entire system has no mechanical or electric valves, and only relies on a unique multifunctional valve to control the backwash of the system. Because the unique multi-function valve has no wear and long life, there is no damage record within 10 years, and the management cost is low
3. The working principle of shallow sand filter
Positive washing filtering state: When the system is in the filtering state, the unfiltered water is evenly distributed through a unique water distributor developed by ourselves, and the water passes through the filler layer in the filter in a laminar flow state (refined homogeneous quartz sand/garnet) . When water flows through the packing layer, impurities are trapped in the packing layer. There are multiple evenly distributed water traps at the bottom of the filter to evenly collect and draw the filtered water. Advection filtration can make the filter filter at a high flow rate and still achieve a better filtering effect.
Backwashing state: As impurities accumulate in the packing layer, the loss of internal pressure head will continue to increase. When the pressure head loss of the inlet and outlet water reaches the set value, the system will automatically activate the constant pressure device to switch to the backwash state. When the backwash is completed, the hydraulic valve changes the water supply direction to realize the backwash one by one, which is more convenient Clean up accumulated impurities
When the system is in the backwashing state, the filtration continues. The standard unit sand tank to be backwashed is not filtered, and the other standard unit sand tanks in the system are still filtering. Part of the filtered clean water is used to backwash the standard unit sand tank, and the rest is still sent to the user. The backwash sewage is discharged through the backwash drain of the hydraulic valve. In the high-speed sand tank automatic high-efficiency filtration system, the special water trap design can make the fillers between the fillers scrub each other, maximize the backwash efficiency, reduce the required backwash water (clean water), and at the same time There is no material running out. The backwash of a standard unit sand tank is 2 minutes. After the backwash is completed, the internal pressure head loss of the standard unit sand tank is reduced to a reasonable range, the constant pressure device gives a restoration signal, the hydraulic valve returns to the filtering state, and the next standard unit sand tank Ready to enter the backwash state
Technical specifications of automatic shallow sand filter
No |
Name |
Specification |
Quantity |
Material |
Remark |
1 |
Inlet main pipe |
DN80 |
1pcs |
Carbon steel |
|
2 |
Outlet main pipe |
DN80 |
1pcs |
Carbon steel |
|
3 |
Sewage main pipe |
DN50 |
1pcs |
Carbon steel |
|
4 |
Canister body |
Φ1000x600（Straight section of cylinder） |
2pcs |
Carbon steel |
Pressure resistance 1MPa |
5 |
Water distributor |
2set |
Stainless steel mesh |
||
6 |
Water trap |
2set |
Engineering plastics |
Water cap |
|
7 |
Pneumatic three-way backwash blowdown valve |
3X3” |
2pcs |
Reinforced polyamide |
Bermet/Donot |
8 |
Filter material |
Filter layer:0.6-1.2mm Cushion:2.0-4.0mm |
≥ 0.8 ton |
Quartz sand |
|
9 |
Differential pressure switch |
1pcs |
copper |
||
10 |
Pressure gauge |
2pcs |
With valve |
||
11 |
Vent |
1pcs |
Stainless steel 304 |
||
12 |
Control System |
1set |
Control cabinet (carbon steel) PLC: domestic Xunjie |
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Company certification:
Project shot:
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Nora:Whatsapp:+86 15537368730
e-mail:sales08@lefilter.com
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