CN213834714U - MBR sewage treatment system - Google Patents
MBR sewage treatment system Download PDFInfo
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- CN213834714U CN213834714U CN202022171038.9U CN202022171038U CN213834714U CN 213834714 U CN213834714 U CN 213834714U CN 202022171038 U CN202022171038 U CN 202022171038U CN 213834714 U CN213834714 U CN 213834714U
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Abstract
The utility model discloses an MBR sewage treatment system, which comprises a fan, an anaerobic tank, an anoxic tank, an aerobic tank, an MBR membrane tank, a clean water tank, a first reflux pump, a second reflux pump, a third reflux pump and a reflux pipeline; anaerobism pond, oxygen deficiency pond, good oxygen pond, MBR membrane cisterna, clean water basin are linked together in proper order, and the fan links to each other with the MBR membrane cisterna, is equipped with first backwash pump in the MBR membrane cisterna, is equipped with the second backwash pump in the good oxygen pond, is equipped with the third backwash pump in the oxygen deficiency pond, loops through the backflow pipeline between MBR membrane cisterna, good oxygen pond, oxygen deficiency pond, the anaerobism pond and carries out mixed liquid backward flow and provide dissolved oxygen, and first backwash pump, second backwash pump, third backwash pump are linked together with the backflow pipeline respectively. The utility model discloses can be with good oxygen pond, oxygen deficiency pond, anaerobism pond dissolved oxygen control at suitable within range to improve the efficiency of system's nitrogen and phosphorus removal, make stable up to standard of quality of water, can make the play water reach super high standard emission requirement, and the system energy consumption has showing the reduction than traditional handicraft.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, concretely relates to MBR sewage treatment system.
Background
The membrane bioreactor technology, namely MBR sewage treatment technology, is a product of organic combination of membrane separation technology and sewage biological treatment technology. The technology has the advantages of good and stable effluent quality, small floor area, less residual sludge discharge, no influence of sludge expansion, strong impact load resistance, high automation degree, simple and convenient operation management and the like. With the improvement of effluent quality standard of sewage treatment plants, the reduction of membrane production cost and the improvement of membrane performance, membrane bioreactor technology is receiving increasing attention. However, with the reduction of the membrane production cost and the improvement of the membrane performance, the problem of energy consumption increasingly becomes an MBR process, and the effect of the problem of energy consumption on the MBR process is more and more prominent. The existing data show that the average power consumption of municipal sewage treatment plants in China is 0.29 kW.h/m 3, while the unit power consumption of MBR process sewage treatment plants is 0.6-0.9 kW.h/m 3, which is far higher than that of the traditional biological sewage treatment process; according to statistics, in the MBR sewage treatment process, the energy consumption of the biochemical unit accounts for about 90% of the total energy consumption of the whole plant, and in the MBR sewage treatment process, the energy consumption of the blast aeration accounts for about 65% of the energy consumption of the biochemical unit; in order to control the pollution on the membrane surface, the membrane surface needs to be subjected to high-strength blowing in a blowing aeration mode, the air-water ratio in a general membrane pool is 10: 1-20: 1, the dissolved oxygen concentration of the mixed liquid is as high as 5.0-10.0 mg/L, if the mixed liquid is not scientifically utilized, the energy consumption of the blowing aeration is wasted, the sewage treatment cost is improved, a large amount of high-quality carbon sources in sewage can be consumed, and the water outlet effect of the whole sewage treatment system is not improved. In a conventional MBR system, mixed liquid in a membrane tank directly flows back to a front-end anoxic tank, and the content of dissolved oxygen in the anoxic tank exceeds a normal value due to overhigh content of dissolved oxygen in the membrane tank, so that the denitrification effect of the system is influenced.
SUMMERY OF THE UTILITY MODEL
In view of this, for solving above-mentioned prior art not enough, the utility model aims at providing a MBR sewage treatment system can be with good oxygen pond, oxygen deficiency pond, anaerobism pond dissolved oxygen control at suitable within range to improve the efficiency of system's nitrogen and phosphorus removal, make stable up to standard of quality of water, can make the play water reach super high standard emission requirement, and the system energy consumption is showing the reduction than traditional handicraft.
In order to achieve the above object, the utility model adopts the following technical scheme:
an MBR sewage treatment system comprises a fan, an anaerobic tank, an anoxic tank, an aerobic tank, an MBR membrane tank, a clean water tank, a first reflux pump, a second reflux pump, a third reflux pump and a reflux pipeline;
anaerobism pond, oxygen deficiency pond, good oxygen pond, MBR membrane cisterna, clean water basin are linked together in proper order, the fan links to each other with the MBR membrane cisterna, is equipped with first backwash pump in the MBR membrane cisterna, is equipped with the second backwash pump in the good oxygen pond, is equipped with the third backwash pump in the oxygen deficiency pond, loop through the return line between MBR membrane cisterna, 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, third backwash pump are linked together with the return line respectively.
Furthermore, domestic sewage is introduced into the anaerobic tank.
Furthermore, a first regulating valve used for controlling the backflow amount and the dissolved oxygen content is arranged on the backflow pipeline corresponding to the first backflow pump, a second regulating valve is arranged on the backflow pipeline corresponding to the second backflow pump, and a third regulating valve is arranged on the backflow pipeline corresponding to the third backflow pump.
Furthermore, the return pipelines are perforated pipelines.
Furthermore, the reflux pipeline, the first reflux pump, the second reflux pump and the third reflux pump cooperate and cooperate to reflux the mixed liquid with oxygen content from the MBR membrane tank, the aerobic tank, the anoxic tank and the anaerobic tank in sequence.
Furthermore, the first reflux pump, the second reflux pump and the third reflux pump all adopt submersible pumps, and the pump flow is 2 times of the treatment capacity of the system.
Furthermore, the blower is a Roots blower for aeration, and the outlet of the blower is connected with an aeration pipeline of the MBR membrane tank.
Furthermore, an online dissolved oxygen instrument for observing the content of dissolved oxygen in the tank in real time is respectively arranged in the aerobic tank, the anoxic tank and the anaerobic tank.
Further, under the condition that the system normally operates, the dissolved oxygen content of the aerobic tank is 2-4mg/L, 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.
The utility model has the advantages that:
through the utility model discloses a this system can be with good oxygen pond, oxygen deficiency pond, anaerobism pond dissolved oxygen control at suitable within range to improve the efficiency of system's nitrogen and phosphorus removal, make stable up to standard of quality of water, can make the play water reach super high standard emission requirement, and the system energy consumption has showing the reduction than traditional technology:
1. high-concentration dissolved oxygen in the MBR membrane tank is fully utilized to provide oxygen for the aerobic tank and the anoxic tank;
2. the dissolved oxygen content of the anaerobic tank, the anoxic tank and the aerobic tank can be accurately controlled by controlling the flow rate of each reflux pump;
3. an aeration system of an anoxic tank and an aerobic tank is cancelled, so that energy can be saved, and 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 a test platform;
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, an MBR membrane tank, 6, a clean water tank, 7, a first reflux pump, 8, a second reflux pump, 9, a third reflux pump, 10, a reflux pipeline, 11, a first regulating valve, 12, a second regulating valve, 13 and a third 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.
An MBR sewage treatment system comprises a fan 1, an anaerobic tank 2, an anoxic tank 3, an aerobic tank 4, an MBR membrane tank 5, a clean water tank 6, a first reflux pump 7, a second reflux pump 8, a third reflux pump 9 and a reflux pipeline 10;
The working process of the system is as follows:
s1: and (3) sewage treatment and discharge: domestic sewage inflow water enters an anaerobic tank 2 through a pipe network, is subjected to hydrolytic acidification in the anaerobic tank 2 and then flows into an anoxic tank 3, effluent water of the anoxic tank 3 flows into an aerobic tank 4, the aerobic tank 4 is treated and enters an MBR membrane tank 5, and clear water flows into a clear water tank 6 after being filtered by an MBR membrane and is discharged after reaching the standard;
s2: refluxing the mixed solution of dissolved oxygen:
s21: the fan 1 aerates the MBR membrane tank 5 and simultaneously sweeps the MBR membrane; an aeration system is not separately arranged in the aerobic tank 4; the system load is greatly reduced, and the method is simple, efficient and accurate;
s22: the first reflux pump 7 reflows the high-oxygen content mixed liquor in the MBR membrane tank 5 to the aerobic tank 4, and reflows the high-oxygen content mixed liquor in the MBR membrane tank 5 to the aerobic tank 4 through the mixed liquor reflowing, so as to provide oxygen for the aerobic tank 4; dissolved oxygen is provided for the aerobic tank only by oxygen carried by mixed liquor in the MBR membrane tank 5; a first regulating valve 11 on a return pipeline 10 connected with the first return pump 7 is regulated, the return flow of the first return pump 7 is regulated by controlling the opening degree of the first regulating valve 11, and further the content of dissolved oxygen entering the aerobic tank 4 is controlled;
s23: the second reflux pump 8 is used for refluxing the mixed liquid in the aerobic tank 4 to the anoxic tank 3, an aeration pipeline is not separately arranged in the anoxic tank 3, dissolved oxygen is provided only by oxygen carried in the aerobic 4-reflux mixed liquid, a second regulating valve 12 connected to a reflux pipeline 10 of the second reflux pump 8 is regulated, the reflux quantity of the second reflux pump 8 is regulated by controlling the opening degree of the second regulating valve 12, and further the content of the dissolved oxygen entering the anoxic tank 3 is controlled;
s24: the third reflux pump 9 reflows the mixed liquid in the anoxic tank 3 to the anaerobic tank 2, adjusts a third adjusting valve 13 on a reflux pipeline 10 connected with the third reflux pump 9, adjusts the reflux quantity of the third reflux pump 9 by controlling the opening degree of the third adjusting valve 13, and further controls the dissolved oxygen content entering the anaerobic tank 2.
Further, in step S2, the aerobic tank 4, the anoxic tank 3, and the anaerobic tank 2 are respectively provided with an online dissolved oxygen meter for real-time observation of the dissolved oxygen content in the tanks.
Further, in the step S2, when the system is operating normally, the dissolved oxygen content in the aerobic tank 4 is 2-4mg/L, the dissolved oxygen content in the aerobic tank 4 can be observed by an online dissolved oxygen meter installed in the aerobic tank 4, and if the dissolved oxygen content is greater than 4mg/L, the opening of the first adjusting valve 11 is adjusted to be smaller, so as to reduce the backflow amount, thereby reducing the amount of dissolved oxygen carried by the backflow liquid to the anoxic tank 3, and finally achieving the purpose of reducing the dissolved oxygen content in the aerobic tank 4. If the dissolved oxygen content of the anoxic tank is less than 2mg/L, the opening of the first regulating valve 11 is adjusted to be larger, so that the reflux amount is increased, the amount of the dissolved oxygen carried by the reflux liquid to the aerobic tank 4 is increased, and the purpose of increasing the dissolved oxygen content of the aerobic tank 4 is finally achieved;
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 second regulating valve 12 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 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 second regulating valve 12 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 is increased, and the purpose of increasing the dissolved oxygen content of the anoxic tank is finally achieved;
under the condition that the system normally operates, 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 more than 0.2mg/L, the opening degree of the third regulating valve 13 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, domestic sewage is introduced into the anaerobic tank 2.
Furthermore, a first regulating valve 11 for controlling the reflux amount and the dissolved oxygen content is arranged on the reflux pipeline 10 corresponding to the first reflux pump 7, a second regulating valve 12 is arranged on the reflux pipeline 10 corresponding to the second reflux pump 8, and a third regulating valve 13 is arranged on the reflux pipeline 10 corresponding to the third reflux pump 9.
Further, the return pipes 10 are perforated pipes. A sludge return pipeline in the aerobic tank adopts a perforated pipeline, so that the mixed liquid returned from the membrane tank is uniformly distributed in the aerobic tank 4 to facilitate the uniform distribution of dissolved oxygen; a sludge return pipeline in the anoxic tank 3 adopts a perforated pipeline, so that the sludge returned from the aerobic tank 4 is uniformly distributed in the aerobic tank 4, and the dissolved oxygen content of the anoxic tank 3 can be adjusted by adjusting the return flow amount because the mixed liquid in the aerobic tank 4 carries dissolved oxygen; the sludge return pipeline in the anoxic tank 3 adopts a perforated pipeline, so that the sludge returned from the secondary sedimentation tank is uniformly distributed in the aerobic tank 4. Because the mixed liquor in the anoxic tank 3 carries dissolved oxygen and the content of the dissolved oxygen is not high, the dissolved oxygen in the anaerobic tank 2 can be controlled in a proper range by controlling the reflux amount of the mixed liquor.
Furthermore, the reflux pipeline 10, the first reflux pump 7, the second reflux pump 8 and the third reflux pump 9 cooperate to reflux the mixed liquid containing oxygen from the MBR membrane tank 5, the aerobic tank 4, the anoxic tank 3 and the anaerobic tank 2 in sequence.
Furthermore, the first reflux pump 7, the second reflux pump 8 and the third reflux pump 9 all adopt submersible pumps, and the pump flow is 2 times of the treatment capacity of the system.
Further, the fan 1 is a Roots fan for aeration, and an outlet of the fan 1 is connected with an aeration pipeline of the MBR membrane tank 5.
To sum up, the utility model discloses a MBR sewage treatment system can control good oxygen pond, oxygen deficiency pond, anaerobism pond dissolved oxygen in suitable within range to improve the efficiency of system's nitrogen and phosphorus removal, make stable up to standard of quality of water, can make the play water reach super high standard emission requirement, and the system energy consumption has showing the reduction than traditional technology. The utility model makes full use of the high concentration dissolved oxygen in the MBR membrane tank to provide oxygen for the aerobic tank and the anoxic tank; the dissolved oxygen content of the anaerobic tank, the anoxic tank and the aerobic tank can be accurately controlled by controlling the flow rate of each reflux pump; an aeration system of an anoxic tank and an aerobic tank is cancelled, so that energy can be saved, and 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 (8)
1. The utility model provides a MBR sewage treatment system which characterized in that: the anaerobic biological filter comprises a fan (1), an anaerobic tank (2), an anoxic tank (3), an aerobic tank (4), an MBR membrane tank (5), a clean water tank (6), a first reflux pump (7), a second reflux pump (8), a third reflux pump (9) and a reflux pipeline (10);
anaerobism pond (2), oxygen deficiency pond (3), good oxygen pond (4), MBR membrane cisterna (5), clean water basin (6) are linked together in proper order, fan (1) links to each other with MBR membrane cisterna (5), is equipped with first backwash pump (7) in MBR membrane cisterna (5), is equipped with second backwash pump (8) in good oxygen pond (4), is equipped with third backwash pump (9) in oxygen deficiency pond (3), loop through backflow pipeline (10) between MBR membrane cisterna (5), 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), third backwash pump (9) are linked together with backflow pipeline (10) respectively.
2. The MBR sewage treatment system of claim 1, wherein: domestic sewage is introduced into the anaerobic tank (2).
3. The MBR sewage treatment system of claim 1, wherein: a first regulating valve (11) used for controlling reflux quantity and dissolved oxygen content is arranged on the reflux pipeline (10) corresponding to the first reflux pump (7), a second regulating valve (12) is arranged on the reflux pipeline (10) corresponding to the second reflux pump (8), and a third regulating valve (13) is arranged on the reflux pipeline (10) corresponding to the third reflux pump (9).
4. The MBR sewage treatment system of claim 1, wherein: the return pipelines (10) are all perforated pipelines.
5. The MBR sewage treatment system of claim 1, wherein: the reflux pipeline (10), the first reflux pump (7), the second reflux pump (8) and the third reflux pump (9) are matched to reflux the mixed liquid with the oxygen content from the MBR membrane tank (5), the aerobic tank (4), the anoxic tank (3) and the anaerobic tank (2) in sequence.
6. The MBR sewage treatment system of claim 1, wherein: the first reflux pump (7), the second reflux pump (8) and the third reflux pump (9) are all submersible pumps, and the pump flow is 2 times of the treatment capacity of the system.
7. The MBR sewage treatment system of claim 1, wherein: the blower (1) is an aerated Roots blower, and the outlet of the blower (1) is connected with an aerated pipeline of the MBR membrane tank (5).
8. The MBR sewage treatment system of claim 1, wherein: and online dissolved oxygen meters for observing the content of dissolved oxygen in the tank in real time are respectively arranged in the aerobic tank (4), the anoxic tank (3) and the anaerobic tank (2).
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|---|---|---|---|
| CN202022171038.9U CN213834714U (en) | 2020-09-28 | 2020-09-28 | MBR sewage treatment system |
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| CN202022171038.9U CN213834714U (en) | 2020-09-28 | 2020-09-28 | MBR sewage treatment system |
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| CN213834714U true CN213834714U (en) | 2021-07-30 |
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