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Double-layer filter material biological aerated filter

A technology of biological aerated filter and double-layer filter material, which is applied in the direction of sustainable biological treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc., and can solve the problem of long backwashing time, uneconomical and High strength and other problems, to achieve the effect of reducing backwash resistance loss, reducing backwash water consumption, and improving nitrification efficiency

Inactive Publication Date: 2013-05-08
青岛群恒生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the short age and rapid growth of heterotrophic bacteria sludge, the water head loss in the filter layer near the water inlet increases rapidly, requiring frequent backwashing. If the backwashing water distribution is uneven, the phenomenon of filter material sticking is easy to occur, and finally It will cause the quality of the effluent from the filter to deteriorate, the resistance will increase, and it will have to be shut down for maintenance
(3) BloFOR is not easy to backwash
Strong backwashing intensity, large backwashing water consumption (up to 40%), long backwashing time, and long recovery time after backwashing (>Zh)
(4) It is not conducive to complete the decarburization and nitrification functions at the same time
If the removal of organic matter and ammonia nitrogen is completed in one equipment, it will affect the growth of nitrifying bacteria due to the rapid growth of heterotrophic bacteria and the need for frequent backwashing
If the decarburization and nitrification functions are completed in two series-connected BAFs, since the removal of organic matter is completed in a very short area, the height of the decarburization section is very low at a normal flow rate of 4-6m / h, causing equipment If the load is increased by increasing the filtration rate, the power loss will be increased and the backwash cycle will be shortened, which is also uneconomical

Method used

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  • Double-layer filter material biological aerated filter

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1: the processing of lower concentration domestic sewage (COD concentration is 100-250mg / L): the filter material particle diameter of lower part is 4-6mm, and density is (1800-2200) kg / m , height is 1-1.5m; The upper filter material is 2-3mm, the density is (1800-2200)kg / m3, and the height is 2-3m. The operating water flow rate is 2-3m / h, and the water-air ratio is 1:3-1:6. This process adopts the method of alternating large and small backwashes for backwashing, and a large backwash is performed after about 5-7 small backwashes. Both large and small backwashing adopt air-water combined backwashing method. The removal rate of suspended solids is about 80%, the removal rate of COD is about 80%, and the removal rate of ammonia nitrogen is 80-95%.

Embodiment 2

[0015] Embodiment 2: the treatment of very low concentration domestic sewage (COD concentration<100mg / L): the filter material particle diameter of lower part is 3-5mm, and density is (1800-2200) kg / m3, and height is 1-1.5m; The filter material is 1-3mm, the density is (1800-2200) kg / m, and the height is 2-3m. The operating water flow rate is 3-6m / h, and the water-air ratio is 1:2-1:4. This process adopts the method of alternating large and small backwashes for backwashing, and after about 5-7 small backwashes, a large backwash is performed. Both large and small backwashing adopt air-water combined backwashing method. The removal rate of suspended solids is about 80%, the removal rate of COD is about 80%, and the removal rate of ammonia nitrogen is 80-95%.

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Abstract

The invention provides a double-layer filter material biological aerated filter, which is mainly composed of a water inflow distribution device, a support layer, a double filter material layer, a process aerating device, a backwash aerating device, a central drainage device, and a water outlet; and is characterized in that: a piece of equipment is filled with filter materials of coarse and fine different diameters to form a double filter material layer, which is used for realizing simultaneous decarburization and nitrification functions, the central drainage device is arranged at a place of junction of the upper and lower filter material layer, the branch pipe of a central drainage pipe is opened with small holes for discharging backwash sludge, and two lower layers can make use of different backwash modes. The double-layer filter material biological aerated filter has the advantages that: (1) decarburization and nitrification functions can be simultaneously achieved in a BAF, the filter has a high removal rate for organic matters and ammonia nitrogen, the backwash water consumption is low; and (2) the gas-water ratio is low and only of 2:1-6:1, the operating cost is low, the floor space is small, the system is simple, and the investment is small.

Description

technical field [0001] The invention belongs to a sewage treatment device, in particular to a double-layer filter material aerated biological filter for treating low-concentration domestic sewage. Background technique [0002] Biological aerated filter (BAF) is a sewage treatment process that emerged in the late 1980s and early 1990s. It was initially used as a tertiary treatment, and later developed into a direct secondary treatment. It uses rough and porous granular filter material. Biofilm grows on the surface of the filter material, and aeration is provided at the bottom of the pool. When the sewage flows through the filter bed, the pollutants are first filtered and adsorbed, and then oxidized and decomposed by the microorganisms on the surface of the filter material. Its biggest feature is that it integrates biological oxidation and interception of suspended solids, saves subsequent sedimentation tanks, has the advantages of large volume load, short hydraulic retention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 不公告发明人
Owner 青岛群恒生物科技有限公司
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