Types of water treatment filters
Types of water treatment filters
The main filter product names of China Strainer Network include:Al-alloy Shell Strainer,Antifouling cut off valveAutomatic Back Wash Strainer,Companding Pull-Rod Y Type Strainer,Compressed Air High-efficiency Strainer,Double Sealing Self-purification Anti-reversed Water Sealing Valve，Flange-connection Y Fype Strainer
Multi media filters commonly used in water treatment include anthracite quartz sand magnetite filters, activated carbon quartz sand magnetite filters, activated carbon quartz sand filters, quartz sand ceramic filters, etc.The filter layer design of a multi-media filter mainly considers the following factors:
1. Different filter media have a large density difference, ensuring that there will be no mixing phenomenon after backwashing disturbance.
2. Select filter media according to the purpose of water production.
3. The particle size requirement is that the particle size of the lower filter material is smaller than that of the upper filter material to ensure the effectiveness and full utilization of the lower filter material. In fact, taking a three-layer filter bed as an example, the upper layer of filter material has the largest particle size and is composed of lightweight filter materials with low density, such as anthracite and activated carbon; The middle filter material has a medium particle size and density, and is generally composed of quartz sand; The lower filter material is composed of heavy filter materials with the smallest particle size and highest density, such as magnetite. Due to the limitation of density difference, the selection of filter material for three-layer media filters is basically fixed. The upper filter material plays a role in coarse filtration, while the lower filter material plays a role in fine filtration. This fully utilizes the role of a multi-media filter bed, and the effluent quality is significantly better than that of a single-layer filter bed.For drinking water, the use of filter materials such as anthracite and resin is generally prohibited.
Quartz sand filter
Quartz sand filter is a type of filter that uses quartz sand as the filter material. It can effectively remove suspended solids in water and has a significant removal effect on pollutants such as colloids, iron, organic matter, pesticides, manganese, bacteria, viruses, etc. in water. It has the advantages of low filtration resistance, large specific surface area, strong acid and alkali resistance, oxidation resistance, pH range of 2-13, and good pollution resistance. The unique advantage of quartz sand filter is that it optimizes the design of filter material and filter to achieve adaptive operation of the filter. The filter material has strong adaptability to raw water concentration, operating conditions, pre-treatment processes, etc., that is, the filter bed automatically forms an upper sparse and lower dense state during filtration, which is conducive to ensuring the water quality of the effluent under various operating conditions. During backwashing, the filter material is fully dispersed, and the cleaning effect is good. Sand filters have the advantages of fast filtration speed, high filtration accuracy, and large interception capacity. Widely used in various fields such as power, electronics, beverages, tap water, petroleum, chemical, metallurgical, textile, papermaking, food, swimming pools, municipal engineering, etc., including process water, domestic water, recycled water, and wastewater pretreatment.The quartz sand filter equipment has the characteristics of simple structure, automatic control during operation, large processing flow rate, few backflushing times, high filtration efficiency, low resistance, and easy operation and maintenance.
Activated carbon filter
The filter material is activated carbon, which is used to remove color, odor, residual chlorine, and organic matter. Its main mode of action is adsorption, and activated carbon is an artificially made adsorbent.Activated carbon filters are widely used for water pretreatment in domestic water, food industry, chemical industry, power and other industries. Due to its developed pore structure and large specific surface area, activated carbon has strong adsorption capacity for soluble organic compounds such as benzene and phenolic compounds in water. It also has good removal effects on organic pollutants that are difficult to remove by biological and chemical methods, such as chromaticity, odor, surfactants, synthetic detergents, and dyes. Granular activated carbon achieves a plasma removal rate of over 85% for Ag ^+, Cd ^ 2+, CrO4 ^ 2- in water. [3] After passing through the activated carbon filter bed, the suspended solids in the water are less than 0.1mg/L, the COD removal rate is generally 40%~50%, and the free chlorine is less than 0.1mg/L.
Iron manganese filter
Fill refined manganese sand and quartz sand binary filter media for removing iron and manganese from water. It is generally only used in the pretreatment of raw water containing iron and manganese.application area Pre treatment of systems such as reverse osmosis, electrodialysis, ion exchangers, ultrafiltration, etcPre filtration treatment of raw water for power generation, chemical industry, papermaking, beverages, etcDecolorization and removal of organic matter in chemical plant water supply
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