Side-flow circulation BAF (Biological Aerated Filter) intensified dephosphorization system and method for treating urban sewage with the dephosphorization system

An urban sewage and water outlet technology, applied in the field of water treatment, can solve the problems of high frequency of simultaneous phosphorus removal backwashing, large dosage of post-phosphorus removal chemicals, loss of carbon source for pre-phosphorus removal, etc., so as to reduce the frequency of backwashing. , The effect of improving TP removal rate and saving pharmaceutical costs

Inactive Publication Date: 2011-08-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
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Problems solved by technology

[0008] The present invention aims to solve the problem of poor phosphorus removal effect in the current BAF process, loss of carbon source for phosphorus removal in the front, large amount of phosphorus removal agent in the rear, large project investment, inhibition of mi

Method used

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  • Side-flow circulation BAF (Biological Aerated Filter) intensified dephosphorization system and method for treating urban sewage with the dephosphorization system
  • Side-flow circulation BAF (Biological Aerated Filter) intensified dephosphorization system and method for treating urban sewage with the dephosphorization system
  • Side-flow circulation BAF (Biological Aerated Filter) intensified dephosphorization system and method for treating urban sewage with the dephosphorization system

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specific Embodiment approach 1

[0015] Specific implementation mode one: combine figure 1 , In this embodiment, the side flow circulation BAF enhanced phosphorus removal system in the present invention includes an anoxic biological filter 1, an aerobic biological aerated filter 2, a reaction tank 3, a sedimentation tank 4, a nitrifying liquid return tank 5, and a dosing pump 7 , water inlet pipe 8, water outlet pipe 9, aeration device 10, excess sludge discharge pipe 13 and return pipe 14; The water inlet is connected, and two water outlets are arranged on the upper part of the anoxic biological filter 1, and one water outlet of the anoxic biological filter 1 is connected with the water inlet of the lower part of the aerobic biological aerated filter 2, and the other of the anoxic biological filter 1 A water outlet communicates with the water inlet at the lower part of the reaction tank 3, the upper water outlet of the reaction tank 3 communicates with the water inlet at the upper part of the sedimentation t...

specific Embodiment approach 2

[0021] Embodiment 2: This embodiment differs from Embodiment 1 in that: the aeration device 10 is a microporous aeration head or a perforated tube. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the filter material in the aerobic biological aerated filter tank 2 is activated carbon or volcanic rock biological filter material. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a side-flow circulation BAF (Biological Aerated Filter) intensified dephosphorization system and a method for treating urban sewage with the dephosphorization system, belonging to the field of water treatment. The invention aims at solving the technical problems such as poor dephosphorization effect, carbon source loss in pre-dephosphorization, large dosing quantity in post-dephosphorization, large investment in project, restraint to microbiological activity in synchronous dephosphorization and over-high frequency of back wash. The BAF intensified dephosphorization system is internally provided with a reaction tank and a sedimentation tank. The side-flow circulation chemistry-biology combined deep dephosphorization system is used for treating urban sewage. Removal rate of COD (chemical oxygen demand) can achieve 92%-95%, removal rate of total nitrogen can achieve above 80% and removal rate of TP (Tea Polyphenols) can achieve above 95%. Compared with that of single two-stage BAF, the removal rate of TP is improved by 55%-60%; compared with that of post-chemical intensification, the construction investment can be saved and expenditure of chemical agents can be saved by about 10%; and compared with that of synchronous chemical intensification, the period of back wash can be prolonged 6-8 days, therefore, energy consumption is lowered.

Description

technical field [0001] The invention belongs to the field of water treatment; in particular, it relates to a side flow circulation BAF enhanced phosphorus removal system and a method for treating urban sewage. Background technique [0002] Biofilm method is a water treatment technology that uses microorganisms attached to the surface of the carrier to remove pollutants in water. Biofilm method has advantages that activated sludge method does not have, such as small footprint, strong impact load resistance, and no sludge bulking problem Wait. Therefore, since the 1970s, biofilm wastewater treatment technology has gradually become one of the hotspots of extensive research and attention. [0003] Biological aerated filter (BAF) is a biofilm sewage treatment technology that has developed rapidly in recent years. and application hotspots. [0004] In recent years, the phenomenon of eutrophication in water bodies has become more and more serious, and the main cause of eutrophic...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 李欣董文艺马营营
Owner HARBIN INST OF TECH
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