The principle, characteristics, selection and application scope of mechanical filters
Overview of mechanical filters:
Mechanical filters are also called pressure filters. It is an important part of the pre-treatment and water purification system for pure water preparation. The material is made of steel rubber lining or stainless steel. According to the different filter media, it can be divided into natural quartz sand filter, multi-media filter, activated carbon filter, manganese sand filter, etc. According to the water inlet method, it can be divided into single-flow filter, The dual-flow filter can be used in combination or alone according to the actual situation.
1. working principle
Mechanical filter is to use one or several filter media, under a certain pressure, make the original liquid pass through the media to remove impurities, so as to achieve the purpose of filtration. The fillers inside are generally: quartz sand, anthracite, granular porous ceramics, manganese sand, etc. The user can choose to use it according to the actual situation.
Mechanical filter mainly uses fillers to reduce water turbidity, interception of suspended solids, organic matter, colloidal particles, microorganisms, chlorine smell and some heavy metal ions in the water in the area, and one of the traditional water treatment methods to purify the feed water.
2. Performance characteristics
- Equipment cost is low, operating cost is low, and management is simple
- The filter material can be used multiple times after backwashing, and the filter material has a long life
- Good filtering effect, small footprint
3. the choice of mechanical filter
The size of the mechanical filter depends on the amount of water. A3 steel or stainless steel or glass fiber reinforced plastic can be selected according to different uses. Also, according to the water quality and the requirements of the effluent quality, you can choose single-layer filter material, double-layer filter material or multi-layer filter material. Filter material.
4. the scope of application
Mechanical filtration is widely used in the water treatment process, mainly used for water treatment to remove turbidity, reverse osmosis, and the pretreatment of ion exchange softening and desalination systems. It can also be used for surface water and groundwater removal. The turbidity of the inlet water is required to be less than 20 degrees, and the turbidity of the effluent water can reach 3 degrees or less.
The single-flow mechanical filter has simple pipes and smooth operation. The filtration flow rate is generally 4-50m/n, and the operation period is generally 8 hours. The dual-flow mechanical filter is equipped with water inlet devices at the upper and lower ends, and a water outlet device at the middle. The advantage is that the amount of filtered water is large, the decontamination capacity is high, and the operation cycle is long, generally 20 hours. The disadvantage is that the pipeline system is more complicated, the operation is not stable, and it is difficult to flush and refuel.