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Stainless steel sand tank backwash process


The working principle of the stainless steel sand tank is that when the system is in the filtering state, the water that has not passed the filter passes through the unique water distributor developed by ourselves to distribute the water evenly, and the water passes through the packing layer (refined uniform-grained quartz sand/pomegranate) in the filter in a laminar flow state stone). When water flows through the packing layer, impurities are trapped in the packing layer. There are multiple evenly distributed water collectors at the bottom of the filter, which collect and lead out the filtered water evenly, and filter in advection, so that the filter can filter at a high flow rate and still achieve a better filtering effect.

Backwash status of stainless steel sand cylinder filter system: As impurities continue to accumulate in the packing layer, the internal pressure head loss will continue to increase. When the loss of the inlet and outlet water pressure head reaches the set value, the system will automatically activate the constant pressure device to switch to the backwashing state. When the backwashing of this unit is over, the electric valve will change the water supply direction to realize backwashing one by one, which is more convenient Cleans away accumulated impurities. When the system is in the state of backwashing, the filtration continues, and the standard unit sand tank to be backwashed does not filter, while 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 filtration system, the special design of the water collector can make the fillers scrub each other to maximize the efficiency of backwashing and reduce the required backwashing water (clean water). At the same time, there is no Running material phenomenon.

The backwashing time of a standard unit sand tank is 2 minutes. After the backwashing is over, the internal pressure head loss of the standard unit sand tank is reduced to a reasonable range. The constant pressure device gives a recovery signal, and the electric valve returns to the filtering state. The next standard unit sand tank Then it is ready to enter the backwash state. The stainless steel sand tank can automatically start backwashing in various ways such as time and pressure difference. Each filter in the system is backwashed in turn, and other filters are still filtering to ensure that the system does not interrupt the water supply during the backwashing process. The recoil efficiency is high, the recoil time is short, and water is saved during backwash, and the water consumption for recoil is about 30% of that of traditional sand filters.

In the working principle of the stainless steel sand tank, this process is a crucial step in filtering water, and it is also an important basis for testing the quality of the stainless steel sand tank. Poolking is the best swimming pool equipment manufacturer and supplier in China. Poolking exists to provide the highest quality swimming pool equipment while offering competitive pricing..

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