CN214990545U - MBR integration sewage treatment system - Google Patents
MBR integration sewage treatment system Download PDFInfo
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- CN214990545U CN214990545U CN202120119574.6U CN202120119574U CN214990545U CN 214990545 U CN214990545 U CN 214990545U CN 202120119574 U CN202120119574 U CN 202120119574U CN 214990545 U CN214990545 U CN 214990545U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The utility model discloses an MBR integrated sewage treatment system, which comprises an anoxic tank (1), an aerobic tank (2), a water inlet device (3), a reflux device (4) and a membrane component (7); the method is characterized in that: the water inlet device (3) comprises a water inlet pipe (31) and an ejector (32), wherein the ejector (32) comprises a nozzle (321), a suction chamber (322) and a diffuser pipe (323) which are sequentially arranged; the reflux device (4) comprises a reflux pipe (41), the inlet of the reflux pipe (41) is communicated with the aerobic pool (2), and the outlet of the reflux pipe (41) is communicated with the suction chamber (322) of the ejector (32). Compared with the prior art, the utility model discloses a MBR integration sewage treatment system can realize mixing liquid automatic reflux.
Description
Technical Field
The utility model relates to a sewage treatment technical field specifically indicates a MBR integration sewage treatment system.
Background
The membrane bioreactor (hereinafter referred to as MBR) is an organic combination of the traditional biological treatment process and the membrane separation technology, has the characteristics of good effluent water quality, strong impact resistance, small occupied area, small sludge production amount and the like, and is particularly suitable for areas with tense land, high environmental sensitivity or strict effluent water quality requirement. Under the big background of centralized treatment of rural environment and continuous improvement of discharge standard in China, the integrated sewage treatment device using MBR as a main process is widely popularized and applied in the field of domestic sewage treatment of small towns.
For example, the invention patent with the patent application number of CN202010704355.4 (with the publication number of CN111892164A) discloses a control method of an integrated membrane biological reaction device based on short-cut nitrification and denitrification, which is characterized by comprising the following steps: 2.1 the raw water and the reflux liquid in the aerobic membrane tank enter an anoxic tank, and NO in the reflux liquid2 -Carrying out denitrification reaction by using organic matters in raw water as an electron donor; 2.2, the mixed liquid after the reaction in the anoxic tank enters an aerobic membrane tank, the dissolved oxygen value of the aerobic membrane tank is controlled to be 0.3-0.5 mg/L, and NH is added4 +Oxidation to NO by AOB bacteria2 -(ii) a 2.3, filtering the water body by a membrane module and then discharging to obtain purified water; 2.4, discharging the sludge from the system through a sludge discharge device, wherein the SRT value of the system is controlled to be 8-12 d. The scheme can enrich the AOB bacteria, save carbon sources, reduce the aeration consumption and improve the denitrification efficiency.
However, in practical engineering, as the MBR process has high energy consumption and membrane cleaning has high requirements on operation and maintenance, many MBR integrated sewage treatment devices do not design a maintenance cleaning system in order to save cost, which is easy to aggravate membrane pollution and shorten the service life of the membrane; meanwhile, in order to achieve the purpose of removing total nitrogen (hereinafter referred to as TN), the mixed liquid reflux of the integrated sewage treatment device usually adopts a gas stripping technology, but the defects of difficult adjustment of flow and poor stability also bring adverse effects to engineering application. Therefore, how to reduce investment, save energy consumption and simplify operation and maintenance becomes an important direction for development and improvement of the MBR integrated sewage treatment device, and has important significance for popularization of the MBR technology in the field of rural domestic sewage treatment.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the first technical problem that to prior art's current situation, provide a MBR integration sewage treatment system that can realize mixing liquid automatic return.
The utility model aims to solve the second technical problem that a MBR integration sewage treatment system that can realize the play water and the back flush function of membrane module through same device is provided.
The utility model provides a technical scheme that above-mentioned first technical problem adopted does: an MBR integrated sewage treatment system comprises
An anoxic tank;
the aerobic tank is communicated with the anoxic tank;
the water inlet device is communicated with the anoxic tank and is used for conveying raw water into the anoxic tank;
the reflux device is respectively communicated with the anoxic tank and the aerobic tank and is used for conveying the liquid in the aerobic tank into the anoxic tank; and
the membrane component is arranged in the aerobic tank and used for separating mud from water;
the method is characterized in that: the water inlet device comprises a water inlet pipe and an ejector, the ejector comprises a nozzle, a suction chamber and a diffuser pipe which are sequentially arranged, an inlet of the nozzle is communicated with an outlet of the water inlet pipe, and an outlet of the diffuser pipe is communicated with the anoxic pond;
the reflux device comprises a reflux pipe, the inlet of the reflux pipe is communicated with the aerobic tank, and the outlet of the reflux pipe is communicated with the suction chamber of the ejector.
In order to form a hydraulic flow form circulating up and down while flushing the membrane curtain and send the mixed liquid into the return pipe by utilizing the impulsive force of the downward water flow, the device also comprises
The aeration device is communicated with the aerobic tank and is used for conveying gas into the aerobic tank;
the aeration device comprises a main air inlet pipe, a fan and a first branch air inlet pipe, wherein an inlet of the main air inlet pipe is communicated with an air inlet end, the fan is arranged on the main air inlet pipe and can convey air at the air inlet end into the main air inlet pipe, an inlet of the first branch air inlet pipe is communicated with the main air inlet pipe, and an outlet of the first branch air inlet pipe is provided with a perforated aeration pipe which is positioned at the bottom of the membrane component and is used for forming updraft passing through the membrane component so as to drive liquid below the membrane component to flow upwards and return downwards from the periphery of the membrane component;
the backflow device also comprises a flow guide cover, the flow guide cover is positioned on the periphery of the membrane assembly, a flow guide channel extending from top to bottom is arranged in the flow guide cover, and an outlet of the flow guide channel is communicated with an inlet of the backflow pipe.
In order to facilitate the collection of the mixed liquid which flows downwards in the opposite direction of the flow guide channel, the inlet of the flow guide channel is in a horn shape and is lower than the top surface of the membrane component.
In order to provide oxygen for the growth of microorganisms and the activity of degrading pollutants, the aeration device also comprises a second branch air inlet pipe, the inlet of the second branch air inlet pipe is communicated with the main air inlet pipe, and the outlet of the second branch air inlet pipe is provided with a microporous aeration disc which is positioned at the bottom of the aerobic tank.
In order to facilitate the discharge of the sludge, the device also comprises
The sludge discharge device is communicated with the aerobic tank and is used for discharging the residual sludge in the aerobic tank;
the sludge discharge device comprises a sludge discharge pipe, and an inlet of the sludge discharge pipe is communicated with the bottom of the aerobic tank.
In order to realize sludge discharge by utilizing the air stripping principle and air provided by the fan, a sludge discharge pump is not required to be additionally arranged, the aeration device also comprises a third branch air inlet pipe, and the outlet end of the third branch air inlet pipe extends into the inlet of the sludge discharge pipe.
In order to play the role of disturbing water flow while uniformly introducing raw water, the stirring of the anoxic tank can be realized without an additional stirring device, the water inlet device also comprises a water distribution pipe which is accommodated at the bottom of the anoxic tank, and an inlet of the water distribution pipe is communicated with an outlet of the diffuser pipe.
In order to facilitate the discharge and storage of the purified water, the device also comprises
The water outlet device is communicated with the outlet of the membrane module and is used for discharging the purified water filtered by the membrane module;
the water outlet device comprises
A clean water tank;
the inlet of the first water conveying pipe is communicated with the outlet of the membrane component;
the inlet of the second water conveying pipe is communicated with the outlet of the first water conveying pipe;
the inlet of the third water conveying pipe is communicated with the outlet of the second water conveying pipe, and the outlet of the third water conveying pipe is communicated with the clean water tank; and
and the self-sucking pump is arranged on the second water conveying pipe and can convey water from the inlet to the outlet of the second water conveying pipe.
In order to further solve the second technical problem, the water outlet device further comprises
The inlet of the fourth water conveying pipe is communicated with the clean water tank, and the outlet of the fourth water conveying pipe is communicated with the inlet of the second water conveying pipe; and
the inlet of the fifth water conveying pipe is communicated with the outlet of the second water conveying pipe, and the outlet of the fifth water conveying pipe is communicated with the outlet of the membrane component;
the first water pipe is provided with a first valve, the third water pipe is provided with a second valve, the fourth water pipe is provided with a third valve, the fifth water pipe is provided with a fourth valve, and the water outlet device has at least two states:
in the water outlet state, the first valve and the second valve are opened, and the third valve and the fourth valve are closed;
in a back flushing state, the first valve and the second valve are closed, and the third valve and the fourth valve are opened.
Compared with the prior art, the utility model has the advantages of: the water inlet device is composed of the water inlet pipe and the ejector, when the water inlet device operates normally, sewage is lifted by the lift pump to enter the water inlet pipe, and is sprayed out from the nozzle of the ejector at a high speed to form negative pressure in the suction chamber, so that mixed liquid in the aerobic pool is sucked from the return pipe, the sewage and the sucked mixed liquid are uniformly mixed in the ejector and then are sent into the anoxic pool, other power equipment is not needed, automatic return of the mixed liquid can be realized, the mixed liquid and the water are more fully mixed, the investment is saved, the energy consumption is low, and the management is convenient.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the MBR integrated sewage treatment system of the present invention;
FIG. 2 is a schematic view of the reflux principle of the mixed liquid in the embodiment of the MBR integrated sewage treatment system of the present invention;
FIG. 3 is a schematic diagram of the effluent and backwash principle of the membrane module in the embodiment of the MBR-integrated sewage treatment system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 1 to 3, a preferred embodiment of the MBR integrated sewage treatment system of the present invention is shown. The MBR integrated sewage treatment system comprises an anoxic tank 1, an aerobic tank 2, a water inlet device 3, a reflux device 4, an aeration device 5, a sludge discharge device 6, a membrane module 7, a water outlet device 8 and a controller 9.
Wherein, the anoxic pond 1 is used for the growth of facultative microorganisms and carrying out denitrification.
The aerobic tank 2 is used for the growth of aerobic microorganisms, shares a local side wall with the anoxic tank 1, and the upper part of the side wall is provided with an overflowing hole for communicating the anoxic tank 1 and the aerobic tank 2.
The membrane component 7 is arranged at the tail end of the aerobic tank 2 and used for separating mud and water. In this embodiment, the membrane module 7 is a hollow fiber microfiltration membrane.
The water inlet device 3 is communicated with the anoxic tank 1 and is used for conveying raw water into the anoxic tank 1. In this embodiment, the water inlet device 3 includes a water inlet pipe 31, an ejector 32, and a water distribution pipe 33. The inlet of the water inlet pipe 31 is communicated with the raw water end; the ejector 32 comprises a nozzle 321, a suction chamber 322 and a diffuser pipe 323 which are sequentially arranged, wherein the inlet of the nozzle 321 is communicated with the outlet of the water inlet pipe 31; the water distribution pipe 33 is arranged at the bottom of the anoxic tank 1, and the inlet of the water distribution pipe 33 is communicated with the outlet of the diffuser pipe 323.
The reflux device 4 is respectively communicated with the anoxic tank 1 and the aerobic tank 2 and is used for conveying the liquid in the aerobic tank 2 to the anoxic tank 1. In this embodiment, as shown in fig. 2, the backflow device 4 includes a backflow pipe 41 and a diversion cover 42. The inlet of the return pipe 41 is communicated with the aerobic tank 2, and the outlet of the return pipe 41 is communicated with the suction chamber 322 of the ejector 32; the flow guide cover 42 is positioned at the periphery of the membrane module 7, the flow guide channel 421 extending from top to bottom is arranged in the flow guide cover 42, the inlet of the flow guide channel 421 is in a trumpet shape and is lower than the top surface of the membrane module 7, and the outlet of the flow guide channel 421 is communicated with the inlet of the return pipe 41.
The sludge discharge device 6 is communicated with the aerobic tank 2 and is used for discharging the residual sludge in the aerobic tank 2. In this embodiment, the sludge discharging device 6 comprises a sludge discharging pipe 61, and an inlet of the sludge discharging pipe 61 is communicated with the bottom of the aerobic tank 2.
The aeration device 5 is communicated with the aerobic tank 2 and is used for conveying air into the aerobic tank 2. In this embodiment, the aeration apparatus 5 includes a main air inlet pipe 51, a fan 52, a first branch air inlet pipe 53, a second branch air inlet pipe 54, and a third branch air inlet pipe 55. The inlet of the main air inlet pipe 51 is communicated with an air inlet end, in the embodiment, the air inlet end is the outside atmosphere, and the fan 52 is arranged on the main air inlet pipe 51 and can convey the air at the air inlet end into the main air inlet pipe 51; the inlet of the first branch air inlet pipe 53 is communicated with the main air inlet pipe 51, the outlet of the first branch air inlet pipe 53 is provided with a perforated aeration pipe 531, the perforated aeration pipe 531 is positioned at the bottom of the membrane module 7 and is used for forming ascending air flow passing through the membrane module 7 to realize shaking and washing of the membrane curtain and driving liquid below the membrane module 7 to flow upwards and return downwards from the periphery of the membrane module 7, so that a hydraulic flow form of up-and-down circulation is formed, and the mixed liquid is conveniently conveyed into the flow guide cover 42 by utilizing the impulsive force of downward water flow; the inlet of the second branch air inlet pipe 54 is communicated with the main air inlet pipe 51, the outlet of the second branch air inlet pipe 54 is provided with a microporous aeration disc 541, and the microporous aeration disc 541 is positioned at the bottom of the aerobic tank 2 and is used for oxygenating water and providing oxygen for the growth of microorganisms and the activity of degrading pollutants; the outlet end of the third branch air inlet pipe 55 extends into the inlet of the sludge discharge pipe 61, and the sludge discharge is realized by utilizing the air stripping principle and air provided by the fan 52.
The water outlet device 8 is communicated with an outlet of the membrane module 7 and is used for discharging purified water filtered by the membrane module 7 and back washing the membrane module 7. In this embodiment, as shown in fig. 3, the water outlet device 8 includes a clean water basin 81, a first water pipe 82, a second water pipe 83, a third water pipe 84, a fourth water pipe 85, a fifth water pipe 86, and a self-priming pump 87. The inlet of the first water conveying pipe 82 is communicated with the outlet of the membrane module 7; the inlet of the second water pipe 83 is communicated with the outlet of the first water pipe 82; the inlet of the third water pipe 84 is communicated with the outlet of the second water pipe 83, and the outlet is communicated with the clean water tank 81; the inlet of the fourth water pipe 85 is communicated with the clean water tank 81, and the outlet is communicated with the inlet of the second water pipe 83; the inlet of the fifth water pipe 86 is communicated with the outlet of the second water pipe 83, and the outlet is communicated with the outlet of the membrane module 7; self-priming pump 87 is disposed on second water transport tube 83 and is capable of transporting water from the inlet to the outlet of second water transport tube 83.
The first water pipe 82 is provided with a first valve 821, the third water pipe 84 is provided with a second valve 841, the fourth water pipe 85 is provided with a third valve 851, the fifth water pipe 86 is provided with a fourth valve 861, the first valve 821 and the second valve 841 are normally open automatic valves, the third valve 851 and the fourth valve 861 are normally closed automatic valves, and the water outlet device 8 has at least two states:
in the water outlet state, the valves stop operating, the first valve 821 and the second valve 841 are opened, the third valve 851 and the fourth valve 861 are closed, and the system is in a normal operation mode;
in the backwash state, the valves are operated, the first valve 821 and the second valve 841 are closed, the third valve 851 and the fourth valve 861 are opened, and the system is in the backwash mode.
The controller 9 is electrically connected with the fan 52, the self-priming pump 87 and each valve for controlling the on-off of the valves.
The embodiment also provides a control method of the MBR integrated sewage treatment system, which comprises the following steps:
recording the working cycle of the system as 2N, recording the running time of the self-priming pump 87 in a water outlet state as a, recording the running time of the self-priming pump 87 in a backwashing state as b, and recording the running time of each valve as c;
for the self-priming pump 87, the following steps are performed during 2N: running a, stopping running N-a, running a, stopping running 1/2(N-a-b), running b and stopping running 1/2 (N-a-b);
for each valve, the following procedure was followed during 2N: stop 1/2(3N + a-c), run c, stop 1/2 (N-a-c).
The working principle of the embodiment is as follows:
(1) when the membrane module is in normal operation, sewage is lifted by the lift pump to enter the water inlet pipe 31 and is ejected at a high speed from the nozzle 321 of the ejector 32, negative pressure is formed in the suction chamber 322, so that mixed liquid is sucked from the return pipe 41, the sewage and the sucked mixed liquid are uniformly mixed in the ejector 32 and then enter the water distribution pipe 33, pollutants in the sewage are degraded by microorganisms in the anoxic tank 1 and the aerobic tank 2, clean water is pumped out of the membrane module 7 by the self-priming pump 87, and the clean water is sent into the clean water tank 81 through the first water conveying pipe 82, the second water conveying pipe 83 and the third water conveying pipe 84 in sequence;
(2) when the membrane module 7 needs to be backwashed, the self-sucking pump 87 pumps the clean water in the clean water tank 81 to the membrane module 7 through the fourth water pipe 85, the second water pipe 83 and the fifth water pipe 86 in sequence, so as to carry out the backwash of the clean water of the membrane.
Claims (9)
1. An MBR integrated sewage treatment system comprises
An anoxic tank (1);
the aerobic tank (2) is communicated with the anoxic tank (1);
the water inlet device (3) is communicated with the anoxic tank (1) and is used for conveying raw water into the anoxic tank (1);
the reflux device (4) is respectively communicated with the anoxic tank (1) and the aerobic tank (2) and is used for conveying the liquid in the aerobic tank (2) to the anoxic tank (1); and
the membrane component (7) is arranged in the aerobic tank (2);
the method is characterized in that: the water inlet device (3) comprises a water inlet pipe (31) and an ejector (32), the ejector (32) comprises a nozzle (321), a suction chamber (322) and a diffuser pipe (323) which are sequentially arranged, the inlet of the nozzle (321) is communicated with the outlet of the water inlet pipe (31), and the outlet of the diffuser pipe (323) is communicated with the anoxic pond (1);
the reflux device (4) comprises a reflux pipe (41), the inlet of the reflux pipe (41) is communicated with the aerobic tank (2), and the outlet of the reflux pipe (41) is communicated with the suction chamber (322) of the ejector (32).
2. The MBR-integrated sewage treatment system of claim 1, wherein: also comprises
The aeration device (5) is communicated with the aerobic tank (2) and is used for conveying gas into the aerobic tank (2);
the aeration device (5) comprises a main air inlet pipe (51), a fan (52) and a first branch air inlet pipe (53), wherein the inlet of the main air inlet pipe (51) is communicated with an air inlet end, the fan (52) is arranged on the main air inlet pipe (51) and can convey air at the air inlet end into the main air inlet pipe (51), the inlet of the first branch air inlet pipe (53) is communicated with the main air inlet pipe (51), the outlet of the first branch air inlet pipe (53) is provided with a perforated aeration pipe (531), and the perforated aeration pipe (531) is positioned at the bottom of the membrane module (7) and is used for forming an ascending air flow passing through the membrane module (7) so as to drive liquid below the membrane module (7) to flow upwards and return downwards from the periphery of the membrane module (7);
the backflow device (4) further comprises a flow guide cover (42), the flow guide cover (42) is located on the periphery of the membrane assembly (7), a flow guide channel (421) extending from top to bottom is arranged inside the flow guide cover (42), and an outlet of the flow guide channel (421) is communicated with an inlet of the backflow pipe (41).
3. The MBR-integrated sewage treatment system of claim 2, wherein: the inlet of the flow guide channel (421) is in a trumpet shape and is lower than the top surface of the membrane component (7).
4. The MBR-integrated sewage treatment system of claim 2, wherein: the aeration device (5) further comprises a second branch air inlet pipe (54), the inlet of the second branch air inlet pipe (54) is communicated with the main air inlet pipe (51), the outlet of the second branch air inlet pipe (54) is provided with a microporous aeration disc (541), and the microporous aeration disc (541) is positioned at the bottom of the aerobic tank (2).
5. The MBR-integrated sewage treatment system of claim 2, wherein: also comprises
The sludge discharge device (6) is communicated with the aerobic tank (2) and is used for discharging the residual sludge in the aerobic tank (2);
the sludge discharge device (6) comprises a sludge discharge pipe (61), and the inlet of the sludge discharge pipe (61) is communicated with the bottom of the aerobic tank (2).
6. The MBR-integrated sewage treatment system of claim 5, wherein: the aeration device (5) also comprises a third branch air inlet pipe (55), and the outlet end of the third branch air inlet pipe (55) extends into the inlet of the sludge discharge pipe (61).
7. The MBR-integrated sewage treatment system of claim 1, wherein: the water inlet device (3) also comprises a water distribution pipe (33) which is arranged at the bottom of the anoxic tank (1), and the inlet of the water distribution pipe (33) is communicated with the outlet of the diffuser pipe (323).
8. The MBR-integrated sewage treatment system of any one of claims 1 to 7, wherein: also comprises
The water outlet device (8) is communicated with the outlet of the membrane module (7) and is used for discharging the purified water filtered by the membrane module (7);
the water outlet device (8) comprises
A clean water tank (81);
the inlet of the first water conveying pipe (82) is communicated with the outlet of the membrane component (7);
the inlet of the second water pipe (83) is communicated with the outlet of the first water pipe (82);
the inlet of the third water pipe (84) is communicated with the outlet of the second water pipe (83), and the outlet is communicated with the clean water tank (81); and
and the self-sucking pump (87) is arranged on the second water conveying pipe (83) and can convey water from the inlet to the outlet of the second water conveying pipe (83).
9. The MBR-integrated sewage treatment system of claim 8, wherein: the water outlet device (8) also comprises
The inlet of the fourth water pipe (85) is communicated with the clean water tank (81), and the outlet of the fourth water pipe is communicated with the inlet of the second water pipe (83); and
the inlet of the fifth water pipe (86) is communicated with the outlet of the second water pipe (83), and the outlet of the fifth water pipe is communicated with the outlet of the membrane component (7);
first raceway (82) on be equipped with first valve (821), third raceway (84) on be equipped with second valve (841), fourth raceway (85) on be equipped with third valve (851), fifth raceway (86) on be equipped with fourth valve (861), water outlet device (8) have two kinds of states at least:
in the water outlet state, the first valve (821) and the second valve (841) are opened, and the third valve (851) and the fourth valve (861) are closed;
in a back flushing state, the first valve (821) and the second valve (841) are closed, and the third valve (851) and the fourth valve (861) are opened.
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| CN202120119574.6U CN214990545U (en) | 2021-01-18 | 2021-01-18 | MBR integration sewage treatment system |
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| CN202120119574.6U CN214990545U (en) | 2021-01-18 | 2021-01-18 | MBR integration sewage treatment system |
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