CN213834715U - AAO sewage treatment system - Google Patents
AAO sewage treatment system Download PDFInfo
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- CN213834715U CN213834715U CN202022173313.0U CN202022173313U CN213834715U CN 213834715 U CN213834715 U CN 213834715U CN 202022173313 U CN202022173313 U CN 202022173313U CN 213834715 U CN213834715 U CN 213834715U
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Abstract
The utility model discloses a AAO sewage treatment system, including the anaerobism pond, oxygen deficiency pond, good oxygen pond, sedimentation tank, the clean water basin that are linked together in proper order, good oxygen pond is equipped with first backwash pump, be equipped with the second backwash pump in the oxygen deficiency pond, loop through the backflow pipeline between good oxygen pond, oxygen deficiency pond, the anaerobism pond and mix the liquid backward flow and provide dissolved oxygen, first backwash pump, second backwash pump are linked together with backflow pipeline respectively, correspond first backwash pump be equipped with the first governing valve that is used for controlling backward flow volume and dissolved oxygen content on the backflow pipeline, be equipped with the second governing valve on the backflow pipeline of corresponding second backwash pump. Solves the problem that the dissolved oxygen in the anaerobic tank and the anoxic tank can not be accurately controlled in the prior art. The nitrogen and phosphorus removal efficiency is improved by precisely adjusting the content of dissolved oxygen to create an anoxic and anaerobic environment. Finally, the effluent meets the ultra-high standard discharge requirement.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, concretely relates to AAO sewage treatment system.
Background
In the traditional anaerobic-anoxic-aerobic treatment process, the anoxic tank adopts perforated pipe aeration, and the aerobic tank adopts a microporous membrane aerator for aeration to control the dissolved oxygen content of the anoxic tank and the aerobic tank. The mixed liquid flows back to the anoxic tank from the aerobic tank, and the sludge flows back to the anaerobic tank from the secondary sedimentation tank. In order to ensure the effect of nitrogen and phosphorus removal, the dissolved oxygen content of the anoxic tank needs to be controlled to be 0.2-0.5mg/L and the dissolved oxygen content of the anaerobic tank needs to be controlled to be less than 0.2mg/L in the actual operation process. In the traditional process, the content of dissolved oxygen in the anoxic tank is controlled by controlling the aeration rate mainly through controlling the opening of an aeration pipeline valve of the anoxic tank, the gas flow is difficult to accurately control in the actual operation process, and if the valve opening is large, the content of dissolved oxygen in the anoxic tank is too high, and if the valve opening is too small, the content of dissolved oxygen in the anoxic tank is insufficient. The sludge of the secondary sedimentation tank is from the aerobic tank, so that the sludge contains partial dissolved oxygen, and when the sludge flows back to the anaerobic tank, the dissolved oxygen can be brought into the anaerobic tank, so that the dissolved oxygen content of the anaerobic tank is too high, the growth and the reproduction of anaerobic bacteria in the anaerobic tank are influenced, and the water treatment effect is influenced. Therefore, it is important to develop a method for controlling the dissolved oxygen content of the anoxic tank and the anaerobic tank more effectively.
SUMMERY OF THE UTILITY MODEL
In view of this, in order to solve the deficiencies of the prior art, the utility model aims to provide an AAO sewage treatment system, solve the problem that the anaerobic tank and the oxygen deficiency tank dissolved oxygen can not be accurately controlled in the prior art. The nitrogen and phosphorus removal efficiency is improved by precisely adjusting the content of dissolved oxygen to create an anoxic and anaerobic environment. Finally, the effluent meets the ultra-high standard discharge requirement.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides an AAO sewage treatment system, is including the anaerobism pond, oxygen deficiency pond, good oxygen pond, sedimentation tank, the clean water basin that are linked together in proper order, good oxygen pond is equipped with first backwash pump, be equipped with the second backwash pump in the oxygen deficiency pond, loop through the backflow pipeline between good oxygen pond, oxygen deficiency pond, the anaerobism pond and carry out mixed liquid backward flow and provide dissolved oxygen, first backwash pump, second backwash pump are linked together with the backflow pipeline respectively, correspond first backwash pump be equipped with the first governing valve that is used for controlling backward flow volume and dissolved oxygen content on the backflow pipeline, be equipped with the second governing valve on the backflow pipeline of corresponding second backwash pump.
Further, under the condition that the system normally operates, the dissolved oxygen content of the anoxic tank is 0.2-0.5mg/L, and the dissolved oxygen content of the anaerobic tank is less than 0.2 mg/L.
Furthermore, an aeration pipeline of the aerobic tank is connected with an outlet of a fan, and the aeration mode in the aerobic tank adopts a diaphragm type microporous aerator for aeration.
Furthermore, the first reflux pump and the second reflux pump both adopt submersible pumps, the pump flow of the first reflux pump is 2 times of the system throughput, and the pump flow of the second reflux pump is 1 time of the system throughput.
The reflux pipeline, the first reflux pump and the second reflux pump cooperate and jointly act to reflux the mixed liquid with oxygen content from the aerobic tank, the anoxic tank and the anaerobic tank in sequence.
Furthermore, the return pipelines are perforated pipelines.
The utility model has the advantages that:
the utility model provides a problem of unable accurate control anaerobism pond and oxygen deficiency pond dissolved oxygen among the current technology. The nitrogen and phosphorus removal efficiency is improved by precisely adjusting the content of dissolved oxygen to create an anoxic and anaerobic environment. The final effluent meets the ultra-high standard discharge requirement:
firstly, the dissolved oxygen content of the anoxic tank and the aerobic tank can be accurately controlled by controlling the flow rate of the reflux pump;
and secondly, the aeration of the anoxic tank is cancelled, the power of a fan can be reduced, the energy is saved, and the investment cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic block diagram of the present invention;
fig. 2 is a schematic diagram of the system structure of the present invention;
the labels in the figure are: 1. the system comprises a fan, 2, an anaerobic tank, 3, an anoxic tank, 4, an aerobic tank, 5, a sedimentation tank, 6, a clean water tank, 7, a first reflux pump, 8, a second reflux pump, 9, a reflux pipeline, 10, a first regulating valve, 11 and a second regulating valve.
Detailed Description
The following provides specific embodiments, which will further clearly, completely and specifically explain the technical solutions of the present invention. The present embodiment is the best embodiment based on the technical solution of the present invention, but the scope of the present invention is not limited to the following embodiments.
The utility model provides an AAO sewage treatment system, is including the anaerobism pond 2, oxygen deficiency pond 3, good oxygen pond 4, sedimentation tank 5, the clean water basin 6 that are linked together in proper order, good oxygen pond 4 is equipped with first backwash pump 7, be equipped with second backwash pump 8 in the oxygen deficiency pond 3, loop through backflow pipeline 9 between good oxygen pond 4, oxygen deficiency pond 3, the anaerobism pond 2 and carry out mixed liquid backward flow and provide dissolved oxygen, first backwash pump 7, second backwash pump 8 are linked together with backflow pipeline 9 respectively, correspond first backwash pump 7 be equipped with the first governing valve 10 that is used for controlling backward flow volume and dissolved oxygen content on the backflow pipeline 9, be equipped with second governing valve 11 on the backflow pipeline 9 that corresponds second backwash pump 8.
The utility model discloses a new mixed liquid backward flow method comes the dissolved oxygen in each pond of control system, and its work flow is:
s1: and (3) sewage treatment and discharge: domestic sewage inflow firstly enters an anaerobic tank 2 through a pipe network, acidification is carried out in the anaerobic tank 2, and then the domestic sewage flows into an anoxic tank 3, an aerobic tank 4, a sedimentation tank 5 and a clean water tank 6 in sequence and is discharged after reaching the standard;
s2: refluxing the mixed solution of dissolved oxygen:
s21: the first reflux pump 7 reflows the mixed liquid in the aerobic tank 4 to the anoxic tank 3, and an aeration pipeline is not arranged in the anoxic tank 3 independently; the mixed liquid in the aerobic tank 4 carries dissolved oxygen which can provide the dissolved oxygen for the activated sludge in the anoxic tank 3; the opening of the first regulating valve 10 is regulated to regulate the return flow of the sludge, so that the dissolved oxygen content of the anoxic tank 3 is regulated; the mixed liquid in the aerobic tank 4 carries dissolved oxygen, so the content of the dissolved oxygen in the anoxic tank 3 can be adjusted by adjusting the reflux amount;
s22: the second reflux pump 8 is used for refluxing the mixed liquid in the anoxic tank 3 to the anaerobic tank 2, and the mixed liquid refluxed to the anaerobic tank 2 in the anoxic tank 3 carries dissolved oxygen which can provide the dissolved oxygen for the activated sludge in the anoxic tank 3; the opening degree of the second adjusting valve 11 is adjusted to adjust the sludge reflux amount, so that the dissolved oxygen content of the anaerobic tank 2 is adjusted.
Furthermore, set up a first backflow pump 7 in good oxygen pond 4, with the mixed liquor backward flow in good oxygen pond 4 to oxygen deficiency pond 3, no longer set up the aeration pipe alone in the oxygen deficiency pond 3, only provide dissolved oxygen through the oxygen that carries in the mixed liquor of good oxygen pond 4 backward flow, the regulation of oxygen deficiency pond 3 dissolved oxygen content is realized through the aperture of the first governing valve 10 of valve on the control backflow pipeline promptly. Set up a second backwash pump 8 in oxygen deficiency pond 3, with 3 pond internal mixing liquid refluxes in the oxygen deficiency pond to anaerobism pond 2, come to provide dissolved oxygen for anaerobism pond 2 through the oxygen that carries in the backwash liquid, the content of dissolved oxygen mainly realizes through the aperture of control return line upper valve second governing valve 11 promptly.
Further, domestic sewage is introduced into the anaerobic tank 2.
Furthermore, an online dissolved oxygen instrument for observing the content of dissolved oxygen in the tank in real time is respectively arranged in the anoxic tank 3 and the anaerobic tank 2.
Furthermore, under the normal operation condition of the system, the dissolved oxygen content of the anoxic tank 3 is 0.2-0.5mg/L, the dissolved oxygen content of the anoxic tank 3 can be observed through an online dissolved oxygen instrument arranged on the anoxic tank 3, and if the dissolved oxygen content is more than 0.5mg/L, the opening degree of the first regulating valve 10 is adjusted to be small, so that the reflux amount is reduced, the amount of the dissolved oxygen carried to the anoxic tank 3 by the reflux liquid is reduced, and the purpose of reducing the dissolved oxygen content of the anoxic tank 3 is finally achieved. If the dissolved oxygen content of the anoxic tank 3 is less than 0.2mg/L, the opening of the first regulating valve 10 is adjusted to be larger, so that the reflux amount is increased, the amount of the dissolved oxygen carried by reflux liquid to the anoxic tank 3 is increased, and the purpose of increasing the dissolved oxygen content of the anoxic tank 3 is finally achieved;
under the normal operation condition of the system, the dissolved oxygen content of the anaerobic pool 2 is less than 0.2 mg/L. The dissolved oxygen content of the anaerobic tank 2 can be observed through an online dissolved oxygen meter arranged on the anaerobic tank 2, if the dissolved oxygen content is greater than 0.2mg/L, the opening degree of the second regulating valve 11 is adjusted to be small, so that the reflux amount is reduced, the amount of dissolved oxygen carried to the anaerobic tank 2 by reflux liquid is reduced, and the purpose of reducing the dissolved oxygen content of the anaerobic tank 2 is finally achieved.
Further, an aeration pipeline of the aerobic tank 4 is connected with an outlet of a fan 1, and the fan 1 is an aeration Roots fan and aerates the aerobic tank 4; the aeration mode in the aerobic tank 4 adopts a diaphragm type microporous aerator for aeration, so that the utilization rate of oxygen is improved. The anoxic tank 3 and the aerobic tank 4 are not provided with fans for aeration, so that the amount of aeration air required by the system is reduced, and the purpose of energy conservation is achieved.
Further, the first reflux pump 7 and the second reflux pump 8 both adopt submersible pumps, the pump flow of the first reflux pump 7 is 2 times of the system throughput, and the pump flow of the second reflux pump 8 is 1 time of the system throughput.
Furthermore, the reflux pipeline 9, the first reflux pump 7 and the second reflux pump 8 cooperate to reflux the mixed liquid containing oxygen in sequence from the aerobic tank 4, the anoxic tank 3 and the anaerobic tank 2.
Furthermore, the return pipelines 9 are all perforated pipelines. The holes are formed in the return pipe at the same interval, so that the mixed liquid can uniformly flow out from each small hole, the mixed liquid is uniformly mixed with the original sewage in the water tank, and the generation of dead angles is avoided. A return pipeline 9 communicated with the first return pump 7 uses a perforated pipeline, so that the sludge returned from the aerobic tank 4 is uniformly distributed in the anoxic tank 3, and dead angles are prevented. In addition, the backflow pipeline 9 communicated with the second backflow pump 8 uses a perforated pipeline, so that the sludge returned from the anoxic pond 3 is uniformly distributed in the anaerobic pond 2, and dead angles are prevented.
To sum up, the utility model discloses an AAO sewage treatment system solves the problem of unable accurate control anaerobism pond and oxygen deficiency pond dissolved oxygen among the prior art. The nitrogen and phosphorus removal efficiency is improved by precisely adjusting the content of dissolved oxygen to create an anoxic and anaerobic environment. Finally, the effluent meets the ultra-high standard discharge requirement. The dissolved oxygen content of the anoxic tank and the aerobic tank can be accurately controlled by controlling the flow rate of the reflux pump; the aeration of the anoxic tank is cancelled, the power of the fan can be reduced, the energy is saved, and the investment cost is reduced.
The essential features, the basic principle and the advantages of the invention have been shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only illustrative of the principles of the present invention, and that the present invention can be modified in various ways according to the actual situation without departing from the spirit and scope of the present invention, and these modifications and improvements are all within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. An AAO sewage treatment system which characterized in that: including anaerobic tank (2), oxygen deficiency pond (3), good oxygen pond (4), sedimentation tank (5), clean water basin (6) that are linked together in proper order, good oxygen pond (4) are equipped with first backwash pump (7), be equipped with second backwash pump (8) in oxygen deficiency pond (3), loop through backflow pipeline (9) between good oxygen pond (4), oxygen deficiency pond (3), the anaerobic tank (2) and carry out mixed liquid backward flow and provide dissolved oxygen, first backwash pump (7), second backwash pump (8) are linked together with backflow pipeline (9) respectively, correspond first backwash pump (7) be equipped with first governing valve (10) that are used for controlling backward flow volume and dissolved oxygen content on backflow pipeline (9), be equipped with second governing valve (11) on backflow pipeline (9) of corresponding second backwash pump (8).
2. The AAO sewage treatment system of claim 1, wherein: under the normal operation condition of the system, the dissolved oxygen content of the anoxic tank (3) is 0.2-0.5mg/L, and the dissolved oxygen content of the anaerobic tank (2) is less than 0.2 mg/L.
3. The AAO sewage treatment system of claim 1, wherein: the aeration pipeline of the aerobic tank (4) is connected with the outlet of the fan (1), and the aeration mode in the aerobic tank (4) adopts a diaphragm type microporous aerator for aeration.
4. The AAO sewage treatment system of claim 1, wherein: the first backflow pump (7) and the second backflow pump (8) are both submersible pumps, the pump flow of the first backflow pump (7) is 2 times of the system treatment capacity, and the pump flow of the second backflow pump (8) is 1 time of the system treatment capacity.
5. The AAO sewage treatment system of claim 1, wherein: the reflux pipeline (9), the first reflux pump (7) and the second reflux pump (8) are matched to act together to reflux the mixed liquor with oxygen content from the aerobic tank (4), the anoxic tank (3) and the anaerobic tank (2) in sequence.
6. The AAO sewage treatment system of claim 1, wherein: and the return pipelines (9) are perforated pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022173313.0U CN213834715U (en) | 2020-09-28 | 2020-09-28 | AAO sewage treatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022173313.0U CN213834715U (en) | 2020-09-28 | 2020-09-28 | AAO sewage treatment system |
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| CN213834715U true CN213834715U (en) | 2021-07-30 |
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| CN202022173313.0U Active CN213834715U (en) | 2020-09-28 | 2020-09-28 | AAO sewage treatment system |
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