Floating bed biofilter with backwashing function

Abstract

The invention relates to the technical field of filtering equipment, and discloses a floating bed biofilter with a backwashing function, wherein the floating bed biofilter comprises a filter body, themiddle part of the filter body is provided with a diameter changing section, and the upper part of the filter body is provided with a perforated plate. According to the floating bed biofilter with the backwashing function, when filter material particles flow through the diameter changing section; particles in the middle move along an inclined push plate; the direction changes, diffusion of particles in the diameter changing section is accelerated, and at the same time, the speed of the particles in the middle is reduced; the movement speeds of internal and external particles are consistent; the bed forming quality is improved, and the bed forming time is shortened; meanwhile, when blockage occurs, gradual expansion is performed in one blocked isolation cavity, interference to filter materials in other isolation cavities is avoided, the time for blocking gaps of filter material parts is delayed, and the single-time service period is prolonged; and meanwhile, due to the fact that the filtering effect in the single isolation cavities is poor, interference to the whole body is small, and the output water quality during blockage is improved.

Description

technical field [0001] The invention relates to the technical field of filtering equipment, in particular to a floating bed biological filter with backwashing function. Background technique [0002] see figure 1 , due to the function of the diameter-changing section, the filter material forms a multi-layer filter bed with a small upper part and a larger lower part inside the floating bed filter, and the turbid water flows from the bottom up to realize deep-layer filtration, and the suspended solids in the water are graded and intercepted by the filter layer and dispersed evenly. Compared with other filtration devices, the floating bed filter has the advantages of good backwashing effect, low self-water rate, long operating cycle, and high turbidity of water that can be treated. [0003] In the process of forming a bed, the water flow passes through the variable diameter section, the water speed decreases, and the filter materials with different particle sizes gradually laye...

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Problems solved by technology

[0003] In the process of forming a bed, the water flow passes through the variable diameter section, the water speed decreases, and the filter materials with different particle sizes gradually stratify and float up to the lower end of the porous plate in this state and fix it into a bed. However, when the water flow passes through the variable diameter section , the particles in the water flow expand toward the outer periphery, that is, the particles located on the outer periphery first diffuse outward, and then the particles located on the axis diffuse outward. On the one hand, the particles on the axis diffuse slowly, which affects the overall bed formation efficiency, resulting in When the filter is used, it takes a lot of time to wait. On the other hand, because the particles located at the outer periphery first move toward the outer periphery, part of their rising speed becomes a vertical speed, resulting in slower rising speed of the particles at the outer periphery than those at the axis, which affects the bed formation. quality

[0004] After using for a long period of time, there are more solid impurities adsorbed between the samples, which block the gaps between the particles. When the pressure at the water inlet is inconvenient, the speed at the water outlet decreases, and the stratification of the particles cannot be fixed, resulting in part of the bed falling out, and then Affect the filtration quality, that is, the filtration capacity of the floating bed filter will decrease in the second half of the service life of the floating bed filter, so that the water treatment cannot meet the requirements

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