How often should the manganese sand filter material be backwashed, and the precautions for the manga

Manganese sand filter media is often used in filtration equipment for iron and manganese removal. After a long time, iron scale will be formed, which will affect heat transfer and corrode equipment. The backwash function of the manganese sand filter is used to achieve the intention of removal and purification.

However, because the active filter membrane structure on the surface of the manganese sand filter material is relatively loose and slightly damaged, it is generally not backwashed with air, as long as the pressure difference does not affect the output. When the pressure difference is large enough to be certain, there is no need to do air backwashing, because the membrane on the surface is damaged, and it takes a lot of time to build it from scratch. Therefore, the safe and complete backwashing of manganese sand filter material can be done once a quarter, and the time of each backwash should not be too long, just control it in 5-15 minutes.

Manganese sand filter media is often used in filtration devices for iron and manganese removal. After a long time, iron scale is formed, which affects heat transfer and can corrode equipment. The backwashing function of the manganese sand filter is used to achieve the purpose of removal and purification.

However, because the active membrane structure on the surface of the manganese sand filter material is relatively loose and easy to be destroyed, it is generally not necessary to backwash with air, as long as the pressure difference does not affect the output. When the pressure difference is large to a certain level, it is necessary to simply backwash, and there is no need to engage in air backwashing, because the surface membrane is damaged, and it takes a lot of time to re-establish it. Therefore, it is enough for the manganese sand filter material to be safely and thoroughly backwashed once a quarter, and the time for each backwash should not be too long, just control it in 5-15 minutes.

Generally speaking, once every three months is fine. The reason why it should not be carried out frequently is that there will be a catalytic oxide film on the surface of the product, which helps a lot to improve the effect of filtration. If you do backwashing frequently, it will wash off this film, which will be very disadvantageous.

When the particle size of manganese sand filter material is too large, the pores between the filter materials are large. When filtration, the penetration depth of impurities is large, and it is easy to penetrate the filter layer, affecting the effluent quality; When backwashing, only a large backwash strength can loosen the filter layer, otherwise the backwash effect will be affected. If the backwash is not complete, it will leave many hidden dangers, such as the residue of sludge in the filter layer, and the agglomeration of residual sludge, which will affect the uniformity of water flow during filtration.

The particle size of the manganese sand filter material is too small, and the pores between the filter materials are small. During filtration, it affects the penetration depth of impurities, increases the resistance of water flow, causes the head loss to increase too fast, and the output decreases.

The backwashing time of the natural manganese sand pool is generally 5-15 minutes. The structure of the "active filter membrane" on the surface of the natural manganese sand pool material is relatively sulfurone, which can be destroyed in long-term flushing, so the backwashing of the filter should not destroy the "active membrane" on the surface of the filter material. Otherwise, it will cause serious deterioration of the water quality after filtration, and the form of water distribution system that is not easy to clog iron should be used in the groundwater iron removal filter.

It is recommended to adopt the tubular high-resistance water distribution system with a supporting layer and the lattice or orifice type low-resistance water distribution system.