Shallow Sand Filtration System

DAWT·2022-05-09

System Introduction

The fully automatic shallow filtration system is composed of multiple standard high-speed sand tank units, with a unique water distributor and water collector inside, and a unique two-way automatic flush valve, which can realize multiple standard high-speed in normal system operation. The sand tank is backwashed individually one by one, fully automatic program control. It has the advantages of small backwash water consumption, convenient equipment installation and easy operation. The device has a high flow rate and requires no maintenance. According to different user requirements, there are vertical and horizontal two series. It is suitable for water quality treatment of industrial and civil circulating water systems.

How it works

When the system is in the filtering state, the unfiltered water is evenly distributed through the self-developed unique water distributor, and the water passes through the packing layer (refined uniform-grained quartz sand/garnet) in the filter in a laminar flow state. When water flows through the packing layer, impurities are trapped in the packing layer. There are a plurality of evenly distributed water collectors at the bottom of the filter, the filtered water is evenly collected and drawn out, and the advective filtration can make the filter filter at a high flow rate, and still achieve a better filtering effect. Backwash state: As impurities accumulate in the packing layer, the internal head loss will continue to increase. When the 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 backwashing state. When the backwashing is over, the hydraulic valve changes the direction of the water supply to realize the backwashing one by one, which is more convenient Clean up accumulated impurities. When the system is in the state of backwashing, 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 collector design can make the fillers rub each other, maximize the backwashing efficiency, reduce the required backwashing water (clean water), and at the same time when backwashing No runaway phenomenon. The backwashing of a standard unit sand tank is 2 minutes. After the backwashing is over, the pressure head loss inside the standard unit sand tank is reduced to a reasonable range. The constant pressure device gives a recovery signal, and the hydraulic valve returns to the filtering state. The next standard unit sand tank Then prepare to enter the backwash state product features.