Upward flow novel biological aerated filter adopting filter with filter bricks

Abstract

The invention discloses a upward flow novel biological aerated filter adopting filter with filter bricks. The novel biological aerated filter is sequentially provided with a water distribution gallery, a backwashing gas distribution pipe, a T-shaped filter brick, a single-pore membrane aerator, a filter bed supporting layer, a filter bed filter material layer and a perforated sludge discharge pipefrom bottom to top; the perforated sludge discharge pipe is located in the water distribution gallery, the backwashing gas distribution pipe is located in an inner cavity of the T-shaped filter brick, and the water distribution gallery is located at the bottom of the filter body. According to the biological filter, the specially-made filter bricks are adopted for water distribution and gas distribution, gas and water flow upwards in the same direction, backwashing water distribution and gas distribution are more uniform, blockage is avoided, and the filter bricks are free of vulnerable partsand do not need to be maintained or replaced; a perforated sludge discharge pipe and a slope are arranged in the water distribution gallery, the sludge discharge pipe is connected with a backwashing air branch pipe, and flushing and sludge discharge are carried out regularly, so that the problem of sludge accumulation possibly caused by long-time operation of the water distribution gallery and thebottom of the filter tank is solved; upward flow filtration continuously provides a positive pressure condition at the whole height of the filter tank, air and water flow flow in the same direction,and the fluid is completely and uniformly distributed, so that the biomass is greatly improved, the quantity and activity of dominant organisms are improved, and the function of removing pollutants such as ammonia nitrogen and organic compounds is enhanced.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a novel aerated biological filter using filter bricks for upward flow. Background technique [0002] Biological aerated filter is a sewage treatment process developed in the late 1980s on the basis of ordinary biological filters and referring to the process of feedwater filters. It can be used for secondary and tertiary treatment of sewage, especially for reuse of reclaimed water. This process integrates biological oxidation and interception of suspended solids, saving the subsequent secondary sedimentation tank; it has the function of removing SS, COD, BOD, ammonia nitrogen, phosphorus and other pollutants; it has been greatly developed in the early 1990s, and the scale can reach dozens tons per day. [0003] The water distribution system and backwash gas distribution system of the biological aerated filter in the prior art are realized through the water distribution chamber + f...

AI Technical Summary

Problems solved by technology

[0004] 1. Civil engineering and installation are complex

The production and installation of filter plates and filter beams require very high precision (the horizontal error in a single cell filter tank is not greater than 5mm), which is difficult for general civil engineering units to be produced by professional manufacturers with special steel molds

[0005] 2. The filter head is prone to damage or blockage during operation, and it is inconvenient to check and maintain

The biological aerated filter usually adopts a small-resistance water distribution system (long-handled filter head). The domestic sewage enters the water from the bottom of the filter plate. The water contains a lot of suspended solids, especially plastic film fragments, which are very harmful to the filter head. Head damage or blockage is unavoidable, once it occurs, it is difficult to clean, and it is inconvenient to check and maintain

[0006] 3. Large volume of water distribution chamber

The water distribution room below the filter plate is more than 1 meter high. It is used for installing the filter plate, filter head and daily inspection and maintenance. This volume is relatively large and belongs to the invalid volume.

[0007] 4. If the biological aerated filter adopts filter bricks to distribute water and air, it adopts upward flow, because the sewage enters from the bottom without being filtered by the filter bed. If the water distribution corridor is not flushed and mud is discharged, mud may accumulate after long-term operation. If dredging and maintenance are required, since there is no room for maintenance under the filter bricks, the filter bricks, filter materials, aeration system, etc. in the filter tank need to be emptied, which is basically not feasible

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