Light filter material for aerated biological filter tank and preparation method thereof

A technology of biological aerated filter and lightweight filter material, which is applied in the fields of chemical instruments and methods, sustainable biological treatment, biological water/sewage treatment, etc., and can solve the problem of film-hanging speed, hanging modulus film and filter material tightness Insufficient, COD and ammonia nitrogen removal rate needs to be improved, unfavorable ecological balance and effective utilization of resources, etc., to achieve the effect of favorable treatment, fast and convenient backwashing, and saving construction costs

Inactive Publication Date: 2013-06-26
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ceramsite filter material mainly uses clay as the main raw material, which needs to consume a large amount of clay resources, which is not conducive to the ecological balance and effective utilization of resources, and makes the cost of the filter material higher, and the backwash consumes a lot of energy and takes a long time
However, the existing polymer material filter materials have deficiencies in the film-hanging speed, hanging modulus, and the tightness between the membrane and the filter material, and the removal rate of COD and ammonia nitrogen needs to be improved.

Method used

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  • Light filter material for aerated biological filter tank and preparation method thereof
  • Light filter material for aerated biological filter tank and preparation method thereof
  • Light filter material for aerated biological filter tank and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Polystyrene (PS) is foamed and injected into a spherical filter material, with a particle size of 3-4mm and an apparent density of 0.14g / cm 3 . The apparent density can be measured by the following method: Take a jar with a volume of 1L and dry it to constant weight, and weigh it as W 1 ; Place the filter material to be tested in a desiccator and dry it at 23°C for more than 24 hours, then fill the jar with the dry filter material and weigh it as W 2 ; Then fill the jar with water, wipe off the water on the outer wall of the jar, and weigh it as W 3 ; Pour out all the filter material in the jar, fill it with water and dry the outer wall, and weigh it as W 4 . The apparent density of the filter material is calculated as follows: [(W 2 -W 1 ) / (W 4 -W 3 +W 2 -W 1 )]·1g / cm 3 .

[0025] The obtained filter material and common high-resolution material filter material are carried out hydrophilic test, and the results are shown in Table 1 and Table 2:

[0026]

...

Embodiment 2

[0034] Polystyrene (PS) is foamed and injected into a spherical filter material, with a particle size of 3-4mm and an apparent density of 0.085g / cm 3 . The filter material is irradiated with ultraviolet light with a wavelength of 200nm-400nm for 1.7 hours, and the irradiation temperature is 65°C-70°C.

[0035] The prepared filter material is used in the upflow biological aerated filter for domestic sewage treatment. Under the condition that the air-water ratio is (4-5): 1 and the hydraulic retention time is 1.5h, it is comparable to the ordinary polymer filter. Compared with the sewage treatment effect of raw materials, the results are as follows image 3 , Figure 4 As shown, it can be seen from the figure that the filter material of the present invention has a better COD removal rate during different film-hanging periods, and the filter material of the present invention has a better ammonia nitrogen removal rate after 3 days of film-hanging.

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Abstract

The invention belongs to the technical field of sewage treatment and discloses a light-weight filter material for an aerated biological filter. The filter material is spherical or ellipsoidal, has a particle diameter of 2 mm to 8 mm, and an apparent density of 0.04 g/㎝3 to 0.15 g/㎝3. The filter material of the present invention has the advantages of large specific surface area, strong hydrophilicity, high water holding capacity, large dirt holding capacity, easy backwashing, low backwashing water consumption, high mechanical strength, strong load impact resistance, and long service life. It can also effectively use the space of the filter tank, save the construction cost of the filter tank, and has a strong treatment capacity for COD and ammonia nitrogen. The invention also discloses a preparation method of the lightweight filter material.

Description

technical field [0001] The invention relates to a filter material used as a sewage treatment filler and a preparation method thereof, in particular to a filter material used for an aerated biological filter and a preparation method thereof. Background technique [0002] Biological aerated filter (BAF) is a biofilm wastewater treatment process that combines biological contact oxidation with water filtration. It belongs to biological filtration technology. The dual action of degradation removes pollutants. [0003] In the sewage treatment process of biological aerated filter, the main materials used to make filter materials are inorganic hard materials such as activated carbon, quartz sand, ceramsite and zeolite, and organic hard materials such as polystyrene, polyethylene, polypropylene, PVC, etc. . [0004] The ideal lightweight filter material for biological aerated filter generally should have excellent physical properties such as relatively large specific surface area, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/10
CPCY02W10/10
Inventor 董文艺谭海燕刘文苏王珍珠李宗伟李继王宏杰李婷
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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