Efficiency and working principle of H14 high-efficiency filter

In terms of the materials used in the H14 high-efficiency filter, asymmetric fiber bundle materials are used as filter media. The filter media is asymmetric fiber. Based on the fiber bundle filter media, a core is added, which gives it the advantages of both fiber filter media and particle filter media. Due to the special structure of the filter media, the porosity of the filter bed quickly forms a gradient density with a large top and small bottom, making the filter fast in filtration speed, large in interception volume, and easy to backwash. 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 suspended solids in circulating water of temporary aquaculture ponds.

So how does the working principle of the H14 high-efficiency filter achieve filtration? The difference between the asymmetric fiber filter structure and the continuous gradient density filter bed structure is as follows:

(1) Asymmetric fiber filter structure

The core technology of the 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 void ratio distribution of the filtration section, thereby improving the filter bed's ability to intercept pollutants. The filter bed has the advantages of high porosity, small specific surface area, high filtration rate, large interception volume, and high filtration accuracy of fiber filtration. When the suspended solids in the water flow through the surface of the fiber filter, 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 the 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 media also intensifies the mechanical force on the fibers in the water. The irregular shape of the filter media causes the filter media to rotate under the action of the backwash water flow and airflow, which strengthens the mechanical shear force on the filter media 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 media. In this way, the asymmetric fiber filter media also has the backwashing function of the particle filter media.

(2) Continuous gradient density filter bed structure with sparse top and dense bottom

The filter bed composed of asymmetric fiber bundle filter media 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 media 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 beneficial 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 narrow channel at the lower part, achieving the unity of high filtration rate and high-precision filtration, increasing the filter's pollution interception capacity, and extending the filtration cycle.