Shallow aeration biological filter basin

Abstract

The invention discloses a shallow aeration biological filter basin which comprises a basin. The basin is sequentially provided with a perforated water distribution plate, a supporting layer and a filter material layer from bottom to top, so that the basin is divided into a water distribution zone and a clear water zone, the water distribution zone is positioned below the water distribution plate, and the clear water zone is positioned above the filter material layer; the water distribution zone is communicated with a water inlet pipe; a water outlet groove is formed in the upper portion of the clear water zone; the water outlet groove is communicated with a water outlet pipe; nano-micro-crystal compound filter materials are arranged in the filter material layer; the total height of the basin is 3-4.5 meters; the supporting layer is provided with nano-micro-crystal compound filter materials, and the diameters of the nano-micro-crystal compound filter materials of the supporting layer are larger than the diameters of the nano-micro-crystal compound filter materials of the filter material layer. The shallow aeration biological filter basin has the advantages that the nano-micro-crystal compound filter materials have abundant inherent pores and are reasonable in pore diameter distribution, accordingly, biological membranes are quite firm after being formed and are difficult to damage due to backwash, the biological treatment stability can be guaranteed, the shallow aeration biological filter basin is bravely designed, the construction cost can be greatly reduced, enhancement can be omitted, and energy consumption can be reduced to a great extent.

Description

technical field [0001] The invention relates to a biological filter, in particular to a shallow aerated biological filter. Background technique [0002] Biological aerated filter is a new biofilm sewage treatment process developed in Europe and America in the late 1980s. The process integrates biological oxidation and interception of suspended solids, with large volume load and hydraulic load, short hydraulic retention time, good effluent quality, and low operating costs. With the continuous deterioration of the ammonia nitrogen index of water source water quality and the increasing cost of water production, many tap water supply enterprises are facing tremendous pressure. Applying biological aerated filter to tap water supply enterprises will be the best solution to this problem. However, the existing biological aerated filter adopts ordinary filter material (the specific surface area is 4-7m 2 / g), to meet the filtration index stipulated by the national standard, the he...

AI Technical Summary

Problems solved by technology

In civil construction, the height of 4.5 meters is a threshold. If it is lower than 4.5 meters, only one slab is needed when pouring concrete. Therefore, if it is higher than 4.5 meters, the construction cost will be greatly increased.

In addition, since the secondary settling tank is 2.5 meters high, to flow water from the secondary settling tank into the 5-meter-high biofilter, it is necessary to set up an intermediate layer for lifting, which is very energy-consuming

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