CN214735172U - Wastewater treatment device and wastewater treatment system - Google Patents
Wastewater treatment device and wastewater treatment system Download PDFInfo
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- CN214735172U CN214735172U CN202023234649.XU CN202023234649U CN214735172U CN 214735172 U CN214735172 U CN 214735172U CN 202023234649 U CN202023234649 U CN 202023234649U CN 214735172 U CN214735172 U CN 214735172U
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Abstract
The disclosure relates to the technical field of sewage treatment, in particular to a wastewater treatment device and a wastewater treatment system. The wastewater treatment device that this disclosure provided includes: the device comprises a first regulating tank, an air floatation tank, a primary anoxic tank, a primary aerobic tank, a second regulating tank, a secondary anoxic tank, a secondary aerobic tank and an MBR tank which are connected in sequence; the air flotation tank is connected with the primary anoxic tank through a water inlet pipe, a first return pipeline is arranged between the primary anoxic tank and the primary aerobic tank, and a first return pump is arranged on the first return pipeline; the second-stage aerobic tank is provided with a second return pipeline which is respectively communicated with the second-stage anoxic tank and the first-stage anoxic tank; the MBR tank is provided with a third return pipeline which is respectively communicated with the secondary anoxic tank and the primary anoxic tank, and the third return pipeline is provided with a second return pump; the MBR tank is provided with a drain pipe; the primary aerobic tank is provided with a first aeration unit, the secondary aerobic tank is provided with a second aeration unit, and the MBR tank is provided with a third aeration unit; the one-level oxygen deficiency pond is equipped with first mixer, and the second grade oxygen deficiency pond is equipped with the second mixer, can improve the ammonia nitrogen clearance.
Description
Technical Field
The disclosure relates to the technical field of sewage treatment, in particular to a wastewater treatment device and a wastewater treatment system.
Background
With the rapid development of economy, a large amount of high-concentration ammonia nitrogen wastewater generally exists in the industries such as coal chemical industry, pharmacy, pesticides, coking wastewater, refuse landfill and the like in China at present, the discharge amount is large, the components are too complex, the toxicity is enhanced, the harm to the environment is increased, the eutrophication of the water body is aggravated when the ammonia nitrogen wastewater is discharged into the water body, and even the health of human beings is harmed.
The ammonia nitrogen is brought into the main pollutant total amount control index, which undoubtedly increases the huge environmental protection pressure for industrial enterprises discharging high ammonia nitrogen wastewater in the production process, and the enterprises face the contradiction that the environmental protection requirement is satisfied and the environmental protection investment is reduced. Therefore, under the situation, a high-efficiency low-cost high-ammonia nitrogen wastewater treatment technology is particularly important, and high-concentration complicated ammonia nitrogen wastewater treatment is always a difficult problem to be solved in the wastewater treatment neighborhood.
Disclosure of Invention
In order to solve the technical problem or at least partially solve the technical problem, the present disclosure provides a wastewater treatment device and a wastewater treatment system.
The present disclosure provides in a first aspect a wastewater treatment plant comprising: the device comprises a first regulating tank, an air floatation tank, a primary anoxic tank, a primary aerobic tank, a second regulating tank, a secondary anoxic tank, a secondary aerobic tank and an MBR tank which are connected in sequence;
the air floatation tank is connected with the primary anoxic tank through a water inlet pipe, a first return pipeline is arranged between the primary anoxic tank and the primary aerobic tank, and a first return pump is arranged on the first return pipeline;
the secondary aerobic tank is provided with a second return pipeline which is respectively communicated with the secondary anoxic tank and the primary anoxic tank;
the MBR tank is provided with a third return pipeline which is communicated with the secondary anoxic tank and the primary anoxic tank respectively, and the third return pipeline is provided with a second return pump;
the MBR tank is provided with a drain pipe;
the primary aerobic tank is provided with a first aeration unit, the secondary aerobic tank is provided with a second aeration unit, and the MBR tank is provided with a third aeration unit;
the first-stage anoxic tank is provided with a first stirrer, and the second-stage anoxic tank is provided with a second stirrer.
Further, the wastewater treatment device further comprises a sludge concentration tank, the sludge concentration tank is connected with the second-stage anoxic tank through a fourth return pipeline, and the fourth return pipeline is provided with a third return pump.
Furthermore, the wastewater treatment device also comprises a device room, wherein a controller is arranged between the devices, and the controller is respectively connected with the first reflux pump, the second reflux pump, the first aeration unit, the second aeration unit and the third aeration unit.
Further, the first regulating reservoir is provided with a first grid assembly, the first grid assembly comprises a first grid for filtering large-particle impurities in the wastewater and a first floating oil skimmer for removing oil stains, and the first floating oil skimmer is arranged beside the first grid.
Furthermore, the second regulating reservoir is provided with a second grid assembly, the second grid assembly comprises a second grid for filtering large-particle impurities in the wastewater and a second floating oil skimmer for removing oil stains, and the second floating oil skimmer is arranged beside the second grid.
Further, the MBR tank comprises a membrane frame and a PTFE membrane module;
the PTFE membrane assembly is arranged on the membrane frame.
Furthermore, the water inlet pipe is provided with a valve and a flowmeter.
Furthermore, the wastewater treatment device also comprises a device room, wherein a controller is arranged between the devices, and the controller is respectively connected with the first reflux pump, the second reflux pump, the first aeration unit, the second aeration unit and the third aeration unit.
Further, the MBR tank is provided with a water production pump.
The second aspect of the present disclosure also provides a wastewater treatment system comprising the wastewater treatment device.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the waste water treatment device that this disclosed embodiment provided includes: the device comprises a first regulating tank, an air floatation tank, a primary anoxic tank, a primary aerobic tank, a regulating tank, a secondary anoxic tank, a secondary aerobic tank and an MBR tank which are connected in sequence; the air flotation tank is connected with the primary anoxic tank through a water inlet pipe, a first return pipeline is arranged between the primary anoxic tank and the primary aerobic tank, the original carbon source in the wastewater is utilized to carry out short-cut nitrification and denitrification, the adding amount of an external carbon source is reduced, and the first return pipeline is provided with a first return pump; the second-stage aerobic tank is provided with a second return pipeline which is respectively communicated with the second-stage anoxic tank and the first-stage anoxic tank; the MBR tank is provided with a third return pipeline which is respectively communicated with the secondary anoxic tank and the primary anoxic tank, the original carbon source in the wastewater is utilized to carry out short-cut nitrification and denitrification, the adding amount of an additional carbon source is reduced, and the third return pipeline is provided with a second return pump; the MBR tank is provided with a drain pipe; the primary aerobic tank is provided with a first aeration unit, the secondary aerobic tank is provided with a second aeration unit, and the MBR tank is provided with a third aeration unit; the first-stage anoxic tank is provided with a first stirrer, and the second-stage anoxic tank is provided with a second stirrer. After the wastewater is treated by the first regulating reservoir to regulate the water quality and the water quantity, the wastewater is lifted into main equipment by the first regulating reservoir lifting pump, most organic matters and ammonia nitrogen are removed by air floatation reservoir-multistage anoxic-aerobic treatment, finally the effluent is discharged by reaching the standard through an MBR (membrane bioreactor) reservoir, and the treated effluent enters a municipal sewage pipe network. This device make full use of original carbon source in the waste water carries out the denitrification denitrogenation of short distance nitration, has reduced the volume of throwing of plus carbon source, and economic effect is showing, and the ammonia nitrogen clearance of the high concentration ammonia nitrogen waste water after this device is handled reaches more than 98%, and simple structure, and equipment area is little.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic structural view of a wastewater treatment plant according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of an apparatus for treating wastewater according to an embodiment of the present disclosure.
Reference numerals: 1-an air floatation tank; 2-a first-stage anoxic tank; 3-a first-stage aerobic tank; 4-a second regulating reservoir; 5-a secondary anoxic tank; 6-a secondary aerobic tank; 7-MBR tank; 8-water inlet pipe; 9-a first return line; 10-a first reflux pump; 11-a second return line; 12-a third return line; 13-a second reflux pump; 14-a drain pipe; 15-a first aeration unit; 16-a second aeration unit; 17-a third aeration unit; 18-a first blender; 19-a second mixer; 20-sludge concentration tank; 21-a fourth return line; 22-a third reflux pump; 23-equipment room; and 24-emptying a sludge discharge pipe.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
As shown in fig. 1, an embodiment of the present disclosure provides a wastewater treatment apparatus including: the device comprises a first regulating tank, an air floatation tank 1, a primary anoxic tank 2, a primary aerobic tank 3, a regulating tank, a secondary anoxic tank 5, a secondary aerobic tank 6 and an MBR tank 7 which are connected in sequence; the air flotation tank 1 is connected with the primary anoxic tank 2 through a water inlet pipe 8, a first return pipeline 9 is arranged between the primary anoxic tank 2 and the primary aerobic tank 3, the original carbon source in the wastewater is utilized to carry out short-range nitrification and denitrification for denitrification, the adding amount of an external carbon source is reduced, and the first return pipeline 9 is provided with a first return pump 10; the secondary aerobic tank 6 is provided with a second return pipeline 11 which respectively leads to the secondary anoxic tank 5 and the primary anoxic tank 2; the MBR tank 7 is provided with a third return pipeline 12 which respectively leads to the secondary anoxic tank 5 and the primary anoxic tank 2, the original carbon source in the wastewater is utilized to carry out short-cut nitrification and denitrification, the adding amount of an additional carbon source is reduced, and the third return pipeline 12 is provided with a second return pump 13; MBR pond 7 is equipped with drain pipe 14, holds back through the high efficiency of membrane, keeps higher microbial biomass in making MBR reaction system, and through the mud of mud backwash pump backward flow high concentration, MBR has impact load resistant, and the sludge age is long, and membrane separation makes the difficult degradation composition of macromolecule in the sewage have sufficient dwell time in bioreactor, has improved the degradation efficiency of difficult degradation organic matter greatly. The primary aerobic tank 3 is provided with a first aeration unit 15, the secondary aerobic tank 6 is provided with a second aeration unit 16, and the MBR tank 7 is provided with a third aeration unit 17; the first-stage anoxic tank 2 is provided with a first stirrer 18, and the second-stage anoxic tank 5 is provided with a second stirrer 19.
The first aeration unit 15 includes a first aeration disc, a first air flow meter and a first aeration pump, the second aeration unit 16 includes a second aeration disc, a second air flow meter and a second aeration pump, and the third aeration unit 17 includes a third aeration disc, a third air flow meter and a third aeration pump, and the aeration flow rate can be controlled by a controller.
After the wastewater is treated by the first regulating reservoir to regulate the water quality and the water quantity, the wastewater is lifted into main equipment by the first regulating reservoir lifting pump, most organic matters and ammonia nitrogen are removed by the air floatation tank 1-multistage anoxic-aerobic treatment, finally the effluent is discharged by reaching the standard through the MBR tank 7, and the treated effluent enters a municipal sewage pipe network. This device make full use of in the waste water original carbon source carry out the denitrification of short distance nitration, has reduced the input of additional carbon source, and economic effect is showing, and the ammonia nitrogen clearance of the high concentration ammonia nitrogen waste water after this device is handled reaches more than 98%. The device has the advantages of mature and stable treatment process, moderate investment cost, high PN-MBR treatment efficiency, lower energy consumption, short retention time, high ammonia nitrogen removal rate, simple structure and small equipment floor area.
In some embodiments, the wastewater treatment apparatus further comprises a sludge concentration tank 20, the sludge concentration tank 20 is connected to the second-stage anoxic tank 5 through a fourth return line 21, and the fourth return line 21 is provided with a third return pump 22. The sludge concentration tank 20 is used for collecting sludge, and the collected sludge can also be used for carrying out short-cut nitrification and denitrification nitrogen removal, so that the adding amount of an external carbon source can be reduced. The first-stage aerobic tank 3 is also provided with an emptying sludge discharge pipe 24.
In some embodiments, the wastewater treatment apparatus further includes a plant room 23, and the plant room 23 is provided with a controller, and the controller is connected to the first reflux pump 10, the second reflux pump 13, the first aeration unit 15, the second aeration unit 16, and the third aeration unit 17 respectively. The controller is used for monitoring the oxidation-reduction potential value, the pH value and the dissolved oxygen amount in the short-cut nitrification-denitrification reactor in real time, controlling the biological denitrification reaction to be carried out or stopped according to the detection value, and controlling the aeration flow through the controller. The controller can control the aeration flow rates of the first aeration unit 15, the second aeration unit 16 and the third aeration unit 17 respectively, and the aeration amount can be effectively saved.
In some specific embodiments, the first regulating reservoir is provided with a first grid assembly, the first grid assembly comprises a first grid for filtering large-particle impurities in the wastewater and a first floating oil skimmer for removing oil stains, and the first floating oil skimmer is arranged beside the first grid, so that the large-particle impurities in the wastewater and the oil stains on the surface can be filtered, and the treatment of a subsequent process is facilitated.
The second equalizing basin 4 is equipped with the second grid subassembly, the second grid subassembly is including being used for with large granule impurity in the waste water carries out filterable second grid and the second that is used for getting rid of the greasy dirt skimmer that floats, the second float the skimmer set up in the side of second grid to can filter the greasy dirt on large granule impurity and the surface in the waste water, the processing of the follow-up procedure of being convenient for.
In some specific embodiments, the MBR tank 7 includes a membrane frame and a PTFE membrane module; the PTFE membrane assembly is arranged on the membrane frame. The PTFE membrane component comprises a PTFE (polytetrafluoroethylene) ammonia nitrogen removal membrane, the PTFE ammonia nitrogen removal membrane is a liquid/gas/liquid phase high-efficiency contact system established by a polytetrafluoroethylene (usually called PTFE) hollow fiber membrane component, a hydrophobic PTFE hollow fiber microporous membrane is adopted to separate ammonia nitrogen-containing wastewater from acid absorption liquid, ammonia nitrogen in the wastewater is dissociated into micropores on the PTFE membrane wall of the membrane after being in gaseous NH3, and the micropores are contacted and reacted with the acid absorption liquid on the other side, so that the high-efficiency removal of the ammonia nitrogen in the wastewater is realized, and the emission standard is reached.
In some embodiments, the water inlet pipe 8 is provided with a valve and a flow meter for regulating the rate of water inlet.
And the first regulating tank and the second regulating tank 4 are respectively provided with a doser which is used for adding a coagulant into the first regulating tank or the second regulating tank 4.
In some specific embodiments, the MBR tank 7 is provided with a water production pump. Under the suction action of the water producing pump, water passes through the membrane to obtain clear effluent, and biological flocs, suspended matters, pathogens, macromolecular soluble organic matters and the like are effectively intercepted.
The waste water treatment system that this disclosure provided includes the waste water treatment facilities of any one of above-mentioned technical scheme.
As shown in fig. 2, an embodiment of the present disclosure provides a wastewater treatment method, including the following steps:
s1, performing air floatation treatment, namely introducing the wastewater into an air floatation tank 1, wherein the reaction time is 10-15 minutes, such as 10 minutes, 11 minutes, 12 minutes, 13 minutes, 14 minutes or 15 minutes. Used for removing suspended matters and grease in the wastewater;
s2, performing denitrification reaction on the wastewater treated in the step S1 in the primary anoxic tank 2 to achieve the effect of biological denitrification;
s3, carrying out nitration reaction on the wastewater treated in the step S2 in the primary aerobic tank 3, utilizing the organic matter degradation action of aerobic microorganisms to remove ammonia nitrogen and carbon-containing organic matters, and simultaneously introducing the sludge-water mixed liquor in the primary aerobic tank 3 into the primary anoxic tank 2 for denitrification;
s4, carrying out denitrification reaction on the wastewater treated in the step S3 in a secondary anoxic tank 5 for further biological denitrification;
s5, carrying out nitration reaction on the wastewater treated in the step S4 in a secondary aerobic tank 6, further removing ammonia nitrogen and carbon-containing organic matters, and simultaneously introducing sludge-water mixed liquor in the secondary aerobic tank 6 into a primary anoxic tank 2 and a secondary anoxic tank 5 for denitrification;
and S6, introducing the wastewater treated in the step S5 into an MBR tank 7 to remove organic matters, ammonia nitrogen, total nitrogen and suspended matters in the wastewater, and introducing the sludge-water mixed solution in the MBR tank 7 into the primary anoxic tank 2 and the secondary anoxic tank 5 for denitrification.
Step S0 is further included before step S1, adjustment treatment is carried out, the wastewater is subjected to water quality and water quantity adjustment in a first adjusting tank, and the reaction time of the first adjusting tank is 1-2 days;
in step S6, the reaction temperature is 20-30 ℃, the reaction time is 1-2 days, the method is used for removing organic matters, ammonia nitrogen, total nitrogen and suspended matters in the wastewater, a biological treatment process is adopted according to the characteristic of high carbon-nitrogen ratio of the wastewater, the denitrification of a system is facilitated, and meanwhile, an external carbon source is not needed, and the energy consumption is effectively reduced. The MBR process has good adaptability and impact load resistance to the characteristic of large wastewater fluctuation of the refuse transfer station, can obtain stable and high-quality effluent quality, generates less excess sludge, and can remove ammonia nitrogen and refractory organic matters.
The biological nitrogen and phosphorus removal process coupling the shortcut nitrification and denitrification with the MBR can greatly improve the treatment efficiency of the filter pressing liquid, reduce the retention time, simplify the structural flow, occupy small area, reduce the aeration consumption and improve the nitrogen removal efficiency. And the system is stable in operation control and strong in impact load resistance through the high-efficiency interception effect of the MBR membrane. The MBR membrane treatment enhanced biological denitrification process controls nitrification to a nitrous acid stage, and then denitrifying nitrate to form nitrogen, so that the biological denitrification efficiency and speed can be improved, and carbon sources required by dissolved oxygen and denitrification are greatly saved.
Preferably, the reaction temperature in the MBR tank 7 is controlled to be 20-30 deg.C, such as 20 deg.C, 21 deg.C, 22 deg.C, 23 deg.C, 24 deg.C, 25 deg.C, 26 deg.C, 27 deg.C, 28 deg.C, 29 deg.C or 30 deg.C.
Preferably, the reaction time in the MBR tank 7 is controlled to be 1 to 2 days, for example, 24 hours, 26 hours, 27 hours, 28 hours, 30 hours, 32 hours, 34 hours, 36 hours, 38 hours, 40 hours, 42 hours, 44 hours, 45 hours, 46 hours, or 48 hours.
In some specific embodiments, in step S3, the dissolved oxygen is controlled to be 0.5 to 3mg/L, the temperature is 29 to 35 ℃, and the pH is 7.0 to 8.0; preferably, the dissolved oxygen is controlled to be 0.55-2.5mg/L, the temperature is 30-31 ℃, and the pH is 7.0-8.0. In some embodiments, in step S5, the dissolved oxygen is controlled to be 0.5-3 mg/L, the temperature is 29-35 ℃, and the pH is 7.0-8.0; preferably, the dissolved oxygen is controlled to be 0.55-2.5mg/L, the temperature is 30-31 ℃, and the pH is 7.0-8.0. Realizes short-cut nitrification and denitrification, improves the nitrosation efficiency of ammonia nitrogen, shortens the retention time and reduces the volume of the reactor. The method can strictly control the lower and stable dissolved oxygen concentration, ensures high and stable accumulation rate of the nitrite nitrogen, has higher denitrification efficiency, reduces the aeration amount in the denitrification process, and saves the energy consumption.
In the preferred embodiment, the dissolved oxygen amount is 0.5 to 3mg/L, for example, 0.5mg/L, 0.55mg/L, 0.6mg/L, 0.7mg/L, 0.8mg/L, 0.9mg/L, 1mg/L, 1.1mg/L, 1.2mg/L, 1.3mg/L, 1.4mg/L, 1.5mg/L, 1.6mg/L, 1.7mg/L, 1.8mg/L, 1.9mg/L, 2mg/L, 2.1mg/L, 2.2mg/L, 2.3mg/L, 2.4mg/L, 2.5mg/L, 2.6mg/L, 2.7mg/L, 2.8mg/L, 2.9mg/L, 2.95mg/L or 3 mg/L.
By the change of oxygen supply amount, the reaction forms the alternation of aerobic, anoxic and anaerobic reactions, and utilizes the high-quality carbon source in the inlet water to realize the short-cut nitrification. It can obviously reduce the operation energy consumption of the membrane bioreactor, improve the efficiency and realize the denitrification function in one reactor.
In some specific embodiments, in step S3, the reflux ratio is controlled to be 2-8; in step S5, the reflux ratio is controlled to be 2-8. The original carbon source in the wastewater is utilized to carry out short-cut nitrification and denitrification nitrogen removal, so that the adding amount of an additional carbon source is reduced.
In summary, the wastewater treatment device and the wastewater treatment system provided by the embodiment have the following advantages:
1 coupling short-cut nitrification and denitrification and MBR, the treatment efficiency of the filter pressing liquid can be greatly improved, the retention time is reduced, the total retention time of the process is about 3d, the shorter retention time reduces the tank capacity of the reactor, and the problem of occupied area is effectively solved.
2 culturing the special nitrosobacteria for treating the high-concentration ammonia nitrogen in the filter-pressing liquid by controlling the reaction conditions, thereby improving the reaction speed and effectively saving aeration quantity and denitrification carbon source. Under the condition that the ammonia nitrogen load of inlet water is 1kg of NH4+ -N/m3.d, the ammonia nitrogen nitrosation efficiency reaches more than 80 percent, which is more than 5 times of that of the traditional nitration process.
3, the MBR membrane component which takes polytetrafluoroethylene as a main material has higher strength, can reduce the pollution speed, prolongs the service life of the membrane, and is suitable for treating high ammonia nitrogen wastewater.
4 the device is used for treating wastewater, near zero emission of organic sludge and synchronous nitrogen and phosphorus removal can be realized, the quality of the effluent can be stably discharged up to the standard, and subsequent advanced treatment facilities and tail water disinfection equipment do not need to be added.
The original carbon source in the wastewater is fully utilized to carry out short-cut nitrification and denitrification, the adding amount of the additional carbon source is reduced, and the economic effect is obvious.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An apparatus for treating wastewater, comprising: a first adjusting tank, an air floatation tank (1), a primary anoxic tank (2), a primary aerobic tank (3), a second adjusting tank (4), a secondary anoxic tank (5), a secondary aerobic tank (6) and an MBR tank (7) which are connected in sequence;
the air floatation tank (1) is connected with the primary anoxic tank (2) through a water inlet pipe (8), a first return pipeline (9) is arranged between the primary anoxic tank (2) and the primary aerobic tank (3), and the first return pipeline (9) is provided with a first return pump (10);
the secondary aerobic tank (6) is provided with a second return pipeline (11) which respectively leads to the secondary anoxic tank (5) and the primary anoxic tank (2);
the MBR tank (7) is provided with a third return pipeline (12) which respectively leads to the secondary anoxic tank (5) and the primary anoxic tank (2), and the third return pipeline (12) is provided with a second return pump (13);
the MBR tank (7) is provided with a drain pipe (14);
the primary aerobic tank (3) is provided with a first aeration unit (15), the secondary aerobic tank (6) is provided with a second aeration unit (16), and the MBR tank (7) is provided with a third aeration unit (17);
the first-stage anoxic tank (2) is provided with a first stirrer (18), and the second-stage anoxic tank (5) is provided with a second stirrer (19).
2. The wastewater treatment plant according to claim 1, further comprising a sludge concentration tank (20), wherein the sludge concentration tank (20) is connected with the second stage anoxic tank (5) through a fourth return line (21), and the fourth return line (21) is provided with a third return pump (22).
3. A wastewater treatment plant according to claim 2, characterized by further comprising a plant bay (23), said plant bay (23) being provided with a controller, said controller being connected to said first recirculation pump (10), said second recirculation pump (13), said first aeration unit (15), said second aeration unit (16) and said third aeration unit (17), respectively.
4. The wastewater treatment plant according to claim 1, characterized in that the first conditioning tank is provided with a first grid assembly comprising a first grid for filtering large-particle impurities in wastewater and a first floating oil skimmer for removing oil stains, the first floating oil skimmer being disposed beside the first grid.
5. The wastewater treatment plant according to claim 1, characterized in that the second conditioning tank (4) is provided with a second grid assembly comprising a second grid for filtering large particle impurities in the wastewater and a second floating skimmer for degreasing, which is arranged beside the second grid.
6. The wastewater treatment plant according to claim 1, characterized in that the MBR tank (7) comprises a membrane frame and a PTFE membrane module;
the PTFE membrane assembly is arranged on the membrane frame.
7. Wastewater treatment plant according to claim 1, characterized in that the inlet pipe (8) is provided with a valve and a flow meter.
8. A wastewater treatment plant according to claim 1, characterized by further comprising a plant room (23), wherein the plant room (23) is provided with a controller, and the controller is connected with the first reflux pump (10), the second reflux pump (13), the first aeration unit (15), the second aeration unit (16) and the third aeration unit (17), respectively.
9. Wastewater treatment plant according to claim 1, characterized in that the MBR basin (7) is provided with a water production pump.
10. A wastewater treatment system comprising the wastewater treatment apparatus according to any one of claims 1 to 9.
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