The most common method for mechanical filtration of sewage treatment, according to different filter media, mechanical filtration equipment is divided into two types: particulate media filtration and fiber filtration. Granular media filtration mainly uses granular filter materials such as sand and gravel as filter media, through the adsorption of particulate filter materials and The effect of the pores between the sand particles on the solid suspension in the water body is filtered. The advantage is that it is easy to backflush. The disadvantage is that the filtration speed is slow, generally not more than 7m/h; the amount of interception is small, and the core filter layer only has the surface of the filter layer; Low precision, only 20-40μm, not suitable for rapid filtration of high turbidity sewage. The high-efficiency asymmetric fiber filtration system uses asymmetric fiber bundle material as the filter material, and the filter material is asymmetric fiber. On the basis of the fiber bundle filter material, a core is added to combine the advantages of the fiber filter material and the particulate filter material. Due to the special structure of the filter material, the porosity of the filter bed is quickly formed with a large gradient density, which makes the filter filter faster, has a large amount of interception, and is easy to backwash. Through special design, the drug is added and mixed. The process of flocculation, filtration and the like is carried out in a reactor, so that the device can effectively remove suspended organic matter in the aquaculture water body, reduce the COD, ammonia nitrogen, nitrite, etc. of the water body, and is particularly suitable for filtering the suspended solids in the circulating water of the holding tank.
