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High-efficiency asymmetric fiber filter
High-efficiency asymmetric fiber filter1. Inlet and outlet diameter: In principle, the inlet and outlet diameter of the filter should not be less than the inlet diameter of the matching pump, and is generally consistent with the inlet pipe diameter.2. Nominal pressure: Determine the pressure level of the filter according to the maximum pressure that may occur in the filter pipe 3. Selection of the number of holes: Mainly consider the particle size of impurities to be intercepted, according to the process requirements of the medium flow. The particle size that can be intercepted by various specifications of wire mesh can be found in the table "Filter Specifications" below. 4. Filter material: The material of the filter is generally selected to be the same as the material of the connected process pipeline. For different service conditions, cast iron, carbon steel, low alloy steel, or stainless steel filters can be considered. 5. Calculation of filter resistance loss: For water filters, the pressure loss is 0.52~1.2kpa under the general calculation of the rated flow rate. High-efficiency asymmetric fiber filter Mechanical filtration is the most commonly used method for sewage treatment. According to the different filter media, mechanical filtration equipment is divided into two categories: particle medium filtration and fiber filtration. Particle medium filtration mainly uses granular filter media such as sand and gravel as the filter medium. It achieves filtration through the adsorption of granular filter media and the interception of solid suspended matter in the water body by the pores between sand particles. The advantage is easy backwashing, and the disadvantage is slow filtration speed, generally not exceeding 7m/h; a small amount of interception, and its core filter layer is only the surface of the filter layer; low filtration accuracy, only 20-40μm, is not suitable for rapid filtration of high turbidity sewage. The high-efficiency asymmetric fiber filter system uses asymmetric fiber bundle material as filter material. Its filter material is asymmetric fiber. On the basis of fiber bundle filter material, a core is added, so that it has the advantages of both fiber filter material and particle filter material. Due to the special structure of the filter material, the porosity of the filter bed quickly forms a gradient density with a large top and small bottom, so that the filter has a fast filtration rate, large sewage interception, and easy backwashing. Through special design, the processes of dosing, mixing, flocculation, and filtration are carried out in one reactor, so that the equipment can effectively remove suspended organic matter in the aquaculture water body, reduce COD, ammonia nitrogen, nitrite, etc. in the water body, and is particularly suitable for filtering solid suspended matter in circulating water of temporary holding ponds. Scope of application of high-efficiency asymmetric fiber filter: 1. Aquaculture circulating water treatment; 2. Cooling circulating water, industrial circulating water treatment; 3. Treatment of eutrophic water bodies such as rivers, lakes, and family waterscapes; 4. Reuse of reclaimed water. The mechanism of action of high-efficiency asymmetric fiber filter: 1. Asymmetric fiber filter material structure The core technology of high-efficiency automatic gradient density fiber filter is to use asymmetric fiber bundle material as filter material, one end of which is a loose fiber bundle, and the other end of the fiber bundle is fixed in a solid body with a larger specific gravity. During filtration, the solid core with a larger specific gravity plays a compacting role on the fiber bundle. At the same time, due to the small size of the core, it has little effect on the uniformity of the distribution of the void ratio of the filtration section, thereby improving the pollution interception capacity of the filter bed. The filter bed has the advantages of high porosity, small specific surface area, high filtration rate, large pollution interception amount, and high filtration accuracy of fiber filtration. When the suspended solids in the water flow through the surface of the fiber filter material, under the action of van der Waals gravity and electricity, the adhesion between the suspended solids and the fiber bundle is much greater than the adhesion with quartz sand, which is conducive to improving the filtration rate and filtration accuracy. During backwashing, due to the difference in specific gravity between the core and the fiber, the comet tail fibers spread out and swing with the backwash water flow, generating a strong drag force; the mutual collision between the filter materials also intensifies the mechanical force on the fibers in the water. The irregular shape of the filter material causes the filter material to rotate under the action of the backwash water flow and airflow, which strengthens the mechanical shear force on the filter material during backwashing. The combined effect of the above forces makes it easy for the solid particles attached to the fiber surface to fall off, thereby improving the cleanliness of the filter material. In this way, the asymmetric fiber filter material also has the backwashing function of the particle filter material. 2. Continuous gradient density filter bed structure with sparse top and dense bottom The filter bed composed of asymmetric fiber bundle filter material generates resistance when the water flows through the filter layer under the compaction of the water flow. From top to bottom, the head loss gradually decreases, the water flow speed becomes faster and faster, the compaction degree of the filter material becomes higher and higher, and the porosity becomes smaller and smaller. In this way, a continuous gradient density filter layer distribution is automatically formed along the water flow direction, forming an inverted pyramid structure. This structure is very conducive to the effective separation of suspended solids in water, that is, the particles desorbed from the upper part of the filter bed can be easily captured and retained in the filter bed in the lower narrow channel, achieving the unity of high filtration rate and high-precision filtration, increasing the filter's interception capacity and extending the filtration cycle. |
