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Biological aerated filter provided with suspended bed

A biological aerated filter and suspended bed technology, applied in the direction of sustainable biological treatment, aerobic process treatment, etc., can solve the problems of backwash water volume, large water head loss, high filter material installation density, easy clogging, etc., and achieve water discharge Good water quality, reduced concentration of suspended solids, fast start-up effect

Inactive Publication Date: 2014-10-15
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing biological aerated filter has a high density of filter material, which is easy to block, and has strict requirements on the SS of the influent (generally SS≤100 mg / L, preferably SS≤60mg / L), so the influent needs to be checked preprocessing
At the same time, its backwash water volume and head loss are relatively large.

Method used

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  • Biological aerated filter provided with suspended bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] see figure 1 , a suspended bed biological aerated filter for sewage treatment, comprising a filter 1, a water inlet pipe 2, an aeration pipe 3, a mud discharge pipe 4, a water outlet 5, a filter baffle 6, a filter layer 7 and a suspension Packed bed 8.

[0021] see figure 1 , the water inlet pipe 2, the aeration pipe 3 and the mud discharge pipe 4 are located at the bottom of the filter tank 1, and the lower part of the water inlet pipe 2 has a water outlet hole with a diameter of 3~8 mm; The hole diameter is 2-5 mm; the mud discharge pipe 4 is perforated evenly along the pipeline, and the hole diameter is 20-60 mm.

[0022] see figure 1 , the suspended filler used in the suspended filler bed 8 is commercially available organic suspended filler or light bamboo charcoal, the specific gravity of the filler is 0.5~0.9 and the particle size is 3~6mm. The suspended filler bed 8 is located in the middle of the filter tank 1, accounting for 1 50~80% of the effective vol...

Embodiment 2

[0026] Using the device described in Example 1, in this embodiment, in the filter column with an effective diameter of 50 cm and a height of 100 cm, it is successively filled with a specific gravity of 0.8 and polyethylene spherical fillers with a particle diameter of 4 mm and a specific gravity of 0.2 with a particle diameter of 3 mm. Polyethylene foam filter beads, the filling heights are 50cm (accounting for 50% of the effective volume of the filter) and 10cm (accounting for 10% of the effective volume of the filter). This test adopts natural hanging film, the air-water ratio is 2:1, and the hydraulic load is 0.4m 3 / (m 2 Under the condition of h), domestic sewage influent COD Cr 350mg / L, ammonia nitrogen 20 mg / L, total phosphorus 7 mg / L, SS 100 mg / L, stable operation for 30 days, the results show that COD Cr The average removal rates of , ammonia nitrogen, total phosphorus and SS are 92%, 96%, 98 and 99% respectively.

Embodiment 3

[0028] Adopt the described device of embodiment 1, in this embodiment row, in effective diameter 50cm, in the filter column of high 100cm, filling specific gravity is 0.6 successively respectively, and particle diameter is 6mm, and carbonization degree is the lightweight bamboo charcoal filler of 50% and specific gravity is 0.2, polyethylene foam filter beads with a particle size of 4mm, the filling heights are 60cm (accounting for 60% of the effective volume of the filter) and 15cm (accounting for 15% of the effective volume of the filter). This test adopts natural hanging film, the air-water ratio is 2:1, and the hydraulic load is 0.5m 3 / (m 2 Under the conditions of h), the COD of catering wastewater influent Cr 460mg / L, ammonia nitrogen 25 mg / L, total phosphorus 15 mg / L, SS 120 mg / L, stable operation for 30 days results show that COD Cr The average removal rates of , ammonia nitrogen, total phosphorus and SS are 94%, 96%, 97 and 99% respectively.

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Abstract

The invention relates to a biological aerated filter which is provided with a suspended bed and used for sewage treatment. The biological aerated filter comprises a filter body, a water inlet pipe, an aeration pipe, a sludge discharge pipe, a suspended filler bed layer, a filter layer, a filter material baffle and a water outlet. The filter body is filled with suspended filler and light filter beads, during aeration and water incoming, the filler is naturally accumulated in the filter body respectively to form the suspended fixed bed and the filter layer, when sewage flows through the suspended bed upwards, biochemical treatment is performed under the action of a filler layer biological membrane, and when the treated sewage passes through the upper filter layer, SSs (suspended solids) in the sewage are further intercepted and removed; when water incoming and aeration are stopped, the filler of the suspended bed and the filter layer restores the loose suspension state, the intercepted SSs are deposited at the bottom of the filter body to be discharged out, and functions of the filter body are restored automatically. The biological aerated filter provided with the suspended bed has the advantages that the filter is simple in structure, convenient to operate, quick to start, wide in applicable inlet water SS range, free of backwashing and the like, and the filter has broad popularization and application prospects in small sewage treatment plants.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a suspended bed aerated biological filter for sewage treatment. Background technique [0002] Biological aerated filter (BAF) is a biofilm sewage treatment technology developed in recent years. The principle of the process is to fill the filter with biological filter material with a small particle size, and through aeration inside the filter, a highly active biofilm grows on the surface of the filter material; when the sewage flows through, the highly active biofilm on the surface of the filter material is used to and the biological oxidative degradation of the biological flocs between the filter materials, and biochemically treat the sewage; because the filter material has a small particle size and is in a compacted state, under the adsorption of the biological flocs between the biofilm and the filter material, the filtration The layer can absorb and retain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/02
CPCY02W10/10
Inventor 王学江陈杰王鑫张晶黄嘉瑜颜湘波卜云杰马嵩奔特万夏四清赵建夫
Owner TONGJI UNIV
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