According to different filtering media, mechanical filtering equipment is divided into two types: granular media filtering and fiber filtering. Granular media filtering mainly uses granular media such as sand and stone as filtering media. The filtration is realized through the adsorption of granular media and the interception of suspended solids in water body by pores between sand particles. The advantage is easy to backwash, and the disadvantage is filtration speed Slow, generally not more than 7m / h; less sewage interception, the core filter layer only has the surface of the filter layer; low filtration accuracy, only 20-40 μ m, is not suitable for rapid filtration of high turbidity wastewater.

The high efficiency asymmetric fiber filter system uses asymmetric fiber bundle material as the filter material, and its filter material is asymmetric fiber. On the basis of fiber bundle filter material, a core is added, which makes it have the advantages of both fiber filter material and particle filter material. Due to the special structure of filter material, the pore rate of the filter bed quickly forms a gradient density of up large and down small, which makes the filter fast, large amount of sewage interception and easy to reverse Through special design, the process of dosing, mixing, flocculation and filtration can be carried out in one reactor, so that the equipment can effectively remove the suspended organic matter in the aquaculture water body and reduce the COD, ammonia nitrogen and nitrite in the water body. It is especially suitable for the filtration of suspended solids in the circulating water of the temporary pond.

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