The Sand Filter Is A Shallow Medium Filter

The sand filter is a shallow medium filter, which is a high-efficiency filtering device that uses filter media to remove various suspended solids, microorganisms, and other fine particles in the water, and finally achieves the effect of reducing water turbidity and purifying water quality. Commonly used filter materials are quartz sand, activated carbon, anthracite, manganese sand and the like. Widely used in agricultural irrigation, chemical, petroleum, metallurgy, industrial and mining industries.

The nozzle reaches the dielectric layer. At this time, most of the pollutants are trapped on the upper surface of the medium. Fine dirt and other floating organic matter are trapped inside the dielectric layer to ensure that the production system is free from interference from the pollutants and can work well. After the operation, when the impurities and various suspended materials in the water reach a certain amount, the filtering system can detect the pressure difference between the inlet and outlet through the differential pressure control device in real time, and when the pressure difference reaches the set value, the electronic control PLC will give the control system The three-way hydraulic control valve sends a signal, and the three-way hydraulic control valve automatically controls the three-way valve of the corresponding filter unit through the waterway, so that it closes the inlet passage and simultaneously opens the sewage passage. At this time, the pressure of the sewage passage is small, and other filtering The water of the unit enters through the water outlet of the filter unit under the pressure of water, and continuously washes the medium layer of the filter unit, thereby achieving the effect of cleaning the medium, and the filtered sewage is filtered by the water pressure. The sewage outlet of the unit enters the sewage pipe to complete a sewage discharge process. The filter can also be drained by means of timing control. When the time reaches the time set by the timing controller, the electric control box sends a sewage cleaning signal to the three-way hydraulic control valve, and the specific sewage discharge process is as above.