Shandong FSY Water Saving Technology Co., Ltd

Why do drip irrigation systems have to be equipped with filters?

Release time: 2020-08-19 16:18:38  Hits: 14

Product introduction

Shallow sand filter, also known as automatic shallow sand filter, is composed of several standard high-speed sand cylinder units, with unique water distributor and water collector inside, and unique two-way automatic flushing valve, which can realize the backwashing of multiple standard high-speed sand cylinders one by one in normal system operation, fully automatic program control. It has the advantages of small water consumption, convenient installation and easy operation. The flow rate of the equipment is large, and no maintenance is needed. According to different user requirements, there are vertical and horizontal series. It is suitable for water quality treatment of industrial and civil circulating water systems.


Shallow sand filter, also known as automatic shallow sand filter, is composed of several standard high-speed sand cylinder units, with unique water distributor and water collector inside, and unique two-way automatic flushing valve, which can realize the backwashing of multiple standard high-speed sand cylinders one by one in normal system operation, fully automatic program control. It has the advantages of small water consumption, convenient installation and easy operation. The flow rate of the equipment is large, and no maintenance is needed. According to different user requirements, there are vertical and horizontal series. It is suitable for water quality treatment of industrial and civil circulating water systems.


working principle


Forward washing filtration state: when the system is in filtration state, the unfiltered water is evenly distributed through the unique water distributor developed by ourselves, and the water passes through the packing layer (refined homogeneous quartz sand / garnet) in laminar flow state. When the water flows through the packing layer, impurities are trapped in the packing layer. At the bottom of the filter, there are a number of evenly distributed water collectors, which can collect and lead out the filtered water evenly. The horizontal flow filtration can make the filter filter filter at high flow rate, and still achieve better filtering effect.


Backwashing state: with the accumulation of impurities in the packing layer, the internal head loss will increase. When the loss of inlet and outlet pressure head reaches the set value, the system will automatically activate the constant pressure device to switch to the backwashing state. When the backwashing is finished, the hydraulic valve will change the direction of water supply, so as to realize one by one backwashing, which is more convenient for cleaning accumulated impurities.


When the system is in the backwashing state, the filtration still continues. The standard unit sand tank to be backwashed is not filtered, and other standard unit sand tanks in the system are still filtering. 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 outlet of the hydraulic valve. In the high-speed sand tank automatic high-efficiency filtration system, the special design of water collector can make the fillers rub each other, improve the backwash efficiency, reduce the required backwash water (clean water), at the same time, there is no material leakage during backwashing. The backwashing time of a standard unit sand cylinder is 2 minutes. After the backwashing, the internal head loss of the standard unit sand cylinder is reduced to a reasonable range. The constant pressure device gives the recovery signal, the hydraulic valve returns to the filtering state, and the sand cylinder of the next standard unit is ready to enter the backwashing state.


Product application


Filtration of industrial water -- there are certain system requirements for water quality. Such as: steel plant oxygen lance water, boiler, heat exchanger water supply filtration, can filter out the impurities in the water, to avoid the blockage of several nozzles in the pipeline.

Filtration system of industrial circulating water.


Raw water treatment: it can filter the surface river water, lake water, sea water, reservoir water, well water and urban tap water as the water source of urban residential district water supply, and remove the sand, suspended solids, algae, organic matter, etc. in the water.


 Agricultural irrigation -- it is especially suitable for water resources with high flow rate and good impurity content, such as irrigation of farmland water conservancy, irrigation of lawn on parks and golf courses, etc.


Water for food processing industry, papermaking industry, power plant, industrial circulating water treatment, industrial and medical pure water pretreatment. Industrial production water recycling, industrial wastewater treatment.


 Aquaculture, swimming and water park.


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