Double-layer filter material biological aeration filter pond

A biological aerated filter, double-layer filter material technology, applied in sustainable biological treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of long backwashing time, uneconomical, large load and other problems, to achieve the effect of reducing the loss of backwash resistance, reducing the water consumption of backwashing, and reducing operating resistance

Inactive Publication Date: 2003-03-12
TSINGHUA UNIV +1
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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
[0006] (3) BIOFOR is not easy to backwash
Strong backwashing intensity, large backwashing water consumption (up to 40%), long backwashing time, and long recovery time after backwashing (>2h)
[0007] (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, resulting in Waste of 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 aeration filter pond
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Treatment of low-concentration domestic sewage (COD concentration is 100-250mg / l): the particle size of the lower filter material is 4-6mm, and the density is (1800-2200) kg / m 3 , the height is 1-1.5m; the upper filter material is 2-3mm, and the density is (1800~2200)kg / m 3 , the height is 2-3m. The operating water flow rate is 2-3m / h, and the water-gas 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

[0024] Treatment of extremely low-concentration domestic sewage (COD concentration 3 , the height is 1-1.5m; the upper filter material is 1-3mm, and the density is (1800~2200)kg / m 3 , the height is 2-3m. The operating water flow rate is 3-6m / h, and the water-gas 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

An aerating biologic filter pool with dual layers of filter material for treating sewage is characterized by that two filter materials with different granularities are used, middle discharge tubes with water holes are arranged between two filter layers, and air and water are alternatively used for flushing. Its advantages are both decarbonating and nitrifying functions, high effect, simple system and low cost.

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): C02F3/00C02F3/06
CPCY02W10/10
Inventor 文湘华田文华钱易
Owner TSINGHUA UNIV
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