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Combined type multi-stage biological aerated filter and wastewater treatment process based on same

A technology of biological aerated filter and biological filter, which is applied in the directions of multi-stage water treatment, water/sludge/sewage treatment, aerobic and anaerobic process treatment, etc. Nitrification, biological aerated filter is easy to clog and other problems, to achieve the effect of high treatment effect, prolong the backwash cycle, and reduce the probability of clogging

Inactive Publication Date: 2016-06-15
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned problems that the existing biological aerated filter is easy to be blocked, denitrification cannot be completed, the total nitrogen of the effluent is high, and the generations of carbonized heterotrophic bacteria and nitrifying autotrophic bacteria are different, resulting in different backwashing frequencies. The present invention provides a composite multi-stage aerated biological filter and its technology. The biological filter realizes the separation of carbonization and nitrification and denitrification, and stabilizes the water output. The present invention is realized in the following way:

Method used

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  • Combined type multi-stage biological aerated filter and wastewater treatment process based on same
  • Combined type multi-stage biological aerated filter and wastewater treatment process based on same

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A compound double-stage biological aerated filter, comprising a tank-shaped filter body 25, and a water inlet pipe 1 and an outlet pipe 21 arranged at the bottom end of the tank-shaped filter body 25, the center of the bottom end of the tank-shaped filter body 25 is provided with Cylindrical primary biological aerated filter 26, the primary biological aerated filter 26 divides the filter body 25 into a secondary biological aerated filter 27 and a tertiary biological aerated filter 28 from top to bottom; the cylindrical primary biological aerated filter The diameter ratio of the gas biofilter to the tank-shaped filter body is 1:2;

[0034] The first water distribution device 6, the first aeration device 8, the first perforated plate 13 and the first crushed stone supporting layer 29 are sequentially arranged between the primary biological aerated filter tank 26 and the water inlet pipe 1 from bottom to top; The first perforated plate 13 and the first crushed stone suppor...

Embodiment 2

[0045] In this example, the composite double-stage biological aerated filter obtained in Example 1 is used to treat a certain rural domestic sewage. The COD concentration of the sewage is 240 mg / L, the ammonia nitrogen concentration is 32.1 mg / L, and the nitrate nitrogen concentration is 10 mg / l. .

[0046] The treatment process is as follows:

[0047] A) The simulated laboratory water to be treated is evenly sprinkled into the primary biological aerated filter 26 through the water inlet pipe 1 through the first water inlet device 6, and the inlet water passes through the suspended packing in the central filter column 10 in reverse direction and is exposed at the same time. The air passes through the overflow weir 16 and the check valve 20 into the second-stage biological aerated filter 27 with finer fillers, and then runs downward to the third-stage biological aerated filter 28, and finally passes through the outlet pipe 21 by gravity. discharge;

[0048] Wherein, the disso...

Embodiment 3

[0054] In this embodiment, a compound multi-stage biological aerated filter is used to treat a certain rural domestic sewage. The influent COD concentration is 200-300mg / L, the ammonia nitrogen concentration is 25-40mg / L, the TN concentration is 40-60mg / L, and the TP concentration It is 4-7mg / L, 10-20mg / L phthalic acid lipids, and the turbidity is 7-10NTU.

[0055] The running time of sewage in this example is 6 months, the treated water volume is 2.5L / h, the primary biological aerated filter is backwashed every 7 days, and the secondary biological aerated filter is backwashed every 15 days. The removal rate of organic matter, ammonia nitrogen and total nitrogen can reach more than 85%, the removal rate of TP is about 80%, the removal rate of phthalic acid lipids is more than 60%, and the removal rate of turbidity can reach more than 90%. .

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Abstract

The invention discloses a combined type two-stage biological aerated filter and a wastewater treatment process based on the same. The combined type two-stage biological aerated filter is suitable for buried integral wastewater treatment equipment for rural domestic wastewater and is characterized in that a main filter body is in a steel tank shape, a primary-stage biological aerated filter filled with suspended filler is arranged in the center of a tank body, wastewater is aerated while entering the primary-stage biological aerated filter, carbonization and ammonization of wastewater part and SS (suspended solid) removal are realized, a second-stage biological aerated filter filled with a sodium citrate modified zeolite filter material and a third-stage biological aerated filter are arranged on the periphery of a central filter column; the second-stage biological aerated filter is controlled in dissolved oxygen concentration, synchronous nitration and denitrification are realized, finally, organic matters in the wastewater are further oxidized through the third-stage biological aerated filter, and quality of effluent is improved; the three biological aerated filters are equipped with independent backwashing devices, and backwashing at different frequency and different intensity can be performed independently; carbonization, nitration and denitrification reactions can be completed simultaneously, and decarburization efficiency and denitrification efficiency of the biological aerated filters are improved.

Description

technical field [0001] The invention belongs to the field of sewage treatment, in particular to a composite multistage aerated biological filter and a sewage treatment process based on the filter. Background technique [0002] The biological aerated filter is a sewage treatment device that emerged in the late 1980s and early 1990s. It was originally used for the tertiary treatment of urban sewage, and later developed into a direct use for the secondary treatment of urban sewage. It mainly fills the biofilter with filter materials of different particle sizes, the bottom of the pool is equipped with an aeration device, the sewage flows into the filter material layer, and the clean non-membrane filter bed grows a biofilm to complete the film-hanging stage. After the film coating is completed, the sewage flows through the filter bed, and the pollutants first undergo physical adsorption and ion exchange, and then are oxidized and decomposed by microorganisms on the surface of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
CPCC02F3/30C02F2301/08
Inventor 刘波姚芳侯翔宇孙信柏梁子丁新春王德朋
Owner NANJING UNIV
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