CN114763273A - Moving-type membrane bioreactor, sewage treatment system and method - Google Patents
Moving-type membrane bioreactor, sewage treatment system and method Download PDFInfo
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- CN114763273A CN114763273A CN202110042168.9A CN202110042168A CN114763273A CN 114763273 A CN114763273 A CN 114763273A CN 202110042168 A CN202110042168 A CN 202110042168A CN 114763273 A CN114763273 A CN 114763273A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention provides a movable membrane bioreactor, a sewage treatment system and a method, wherein the movable membrane bioreactor comprises an upper end cover, a lower end cover, a hollow rotating shaft and a plurality of hollow fiber membrane filaments, wherein the upper end cover and the lower end cover are of box-type structures, and a plurality of support frames are arranged between the upper end cover and the lower end cover and used for supporting and fixing the upper end cover and the lower end cover; a water outlet is formed in the bottom surface of the lower end cover; the hollow rotating shaft is arranged between the upper end cover and the lower end cover, and the upper end cover and the lower end cover are communicated at the centers of the upper end cover and the lower end cover; the hollow fiber membrane filaments are vertically arranged between the upper end cover and the lower end cover, and are communicated with the upper end cover and the lower end cover; the movable membrane bioreactor can rotate along with the hollow rotating shaft. The hollow fiber membrane filaments of the movable membrane bioreactor provided by the invention can rotate along with the movable membrane bioreactor, so that the membrane pollution can be effectively reduced, and the sewage treatment efficiency is improved.
Description
Technical Field
The invention relates to a movable membrane bioreactor, a sewage treatment system and a method, belonging to the technical field of sewage treatment.
Background
The Membrane Bioreactor (MBR) is a novel technology combining a biological treatment technology and membrane separation, replaces a traditional secondary sedimentation tank with a membrane component with high separation efficiency, and has the advantages of impact resistance, good treated water quality, convenience for automatic control and the like compared with the traditional biological treatment technology. The membrane bioreactor mainly comprises a bioreactor and a membrane separator (membrane component). Bioreactors are the primary degradation site for contaminants in wastewater. The membrane separator mainly plays a role in solid-liquid separation. However, the MBR membrane is easy to pollute, so that the high maintenance cost is still a main problem which restricts the application of the MBR.
The membrane pollution refers to the phenomenon that the membrane aperture is reduced or blocked due to adsorption and deposition in the membrane surface or the membrane pores caused by the physical, chemical or mechanical action of particles, colloid particles and solute macromolecules in the mixed solution and the membrane, so that the membrane flux and the separation characteristic of the membrane are changed. The membrane pollution is mainly generated by concentration polarization, membrane surface adsorption, membrane hole blockage and biological pollution, under the combined action, a thicker gel layer and a sludge deposition layer are formed on the surface of the membrane, the surface of the membrane is covered, partial membrane holes lose functions, and the flux of effluent of the membrane is reduced.
The current control method for membrane pollution mainly focuses on the three aspects of development of anti-pollution membrane materials, optimization of the operating conditions of a reactor and improvement of the characteristics of mixed liquor. Many prior art in this field disclose methods for reducing membrane fouling. Specifically, the prior art reports an immersion type membrane module composed of plant type membrane modules, which has high membrane filling density and double functions of water collection and gas distribution; in addition, an opening type membrane component and a moving type membrane are also reported in the prior art respectively, membrane filaments of the opening type membrane component can float freely, and membrane pollution is reduced; the dynamic membrane inhibits membrane fouling by rotation of the membrane. Although the membrane bioreactor or the membrane module provided by the prior art can reduce membrane pollution to a certain extent, the membrane bioreactor or the membrane module further reduces the space of membrane pollution, and has advantages and disadvantages such as easy winding of membrane filaments of the expanding type membrane module, complex movable membrane module and troublesome installation.
Therefore, it has become an urgent technical problem in the art to provide a novel membrane bioreactor, a sewage treatment system and a method.
Disclosure of Invention
In order to solve the above disadvantages and shortcomings, it is an object of the present invention to provide a membrane bioreactor.
Another object of the present invention is to provide a sewage treatment system.
Still another object of the present invention is to provide a method for treating sewage.
To achieve the above objects, in one aspect, the present invention provides a dynamic membrane bioreactor, wherein the dynamic membrane bioreactor comprises: the hollow fiber membrane spinning device comprises an upper end cover, a lower end cover, a hollow rotating shaft and a plurality of hollow fiber membrane filaments, wherein the upper end cover and the lower end cover are of box-type structures, and a plurality of supporting frames are arranged between the upper end cover and the lower end cover and used for supporting and fixing the upper end cover and the lower end cover; a water outlet is formed in the bottom surface of the lower end cover;
the hollow rotating shaft is arranged between the upper end cover and the lower end cover, and the upper end cover and the lower end cover are communicated at the centers of the upper end cover and the lower end cover;
the hollow fiber membrane filaments are vertically arranged between the upper end cover and the lower end cover, and are communicated with the upper end cover and the lower end cover;
the movable membrane bioreactor can rotate along with the hollow rotating shaft.
As a specific embodiment of the above-mentioned moving membrane bioreactor of the present invention, wherein the upper end cover and the lower end cover are both circular.
As a specific embodiment of the above-mentioned moving-type membrane bioreactor of the present invention, wherein the diameters of the upper end cover and the lower end cover are both 40cm-100 cm; preferably 40cm to 60 cm.
As a specific embodiment of the above-mentioned membrane bioreactor of the present invention, wherein the number of the supporting frames is 3-5.
As a specific embodiment of the above-mentioned membrane bioreactor, the upper end cover and the lower end cover may be made of polytetrafluoroethylene.
As a specific embodiment of the above moving membrane bioreactor of the present invention, a water collecting pipe is disposed in the upper end cover, and the outlets at the upper ends of the plurality of hollow fiber membrane filaments are connected to the upper port of the hollow rotating shaft through the water collecting pipe.
As a specific embodiment of the above-mentioned membrane bioreactor, a water collecting pipe is disposed in the lower end cover, and the lower outlets of the hollow fiber membrane filaments and the lower port of the hollow rotating shaft are connected to the water outlet through the water collecting pipe.
As a specific embodiment of the above-mentioned moving membrane bioreactor of the present invention, wherein the length of the hollow fiber membrane filaments is 40-100cm, preferably 60-100 cm.
As a specific embodiment of the above-mentioned moving membrane bioreactor of the present invention, wherein the diameter (outer diameter) of the hollow fiber membrane filaments is 1-2 mm.
In a specific embodiment of the above-mentioned dynamic membrane bioreactor, the diameter of the pores on the surface of the hollow fiber membrane filaments is less than 0.6 μm.
As a specific embodiment of the above-mentioned moving membrane bioreactor of the present invention, the hollow fiber membrane filaments may be ultrafiltration membrane filaments or microfiltration membrane filaments, and when the hollow fiber membrane filaments are ultrafiltration membrane filaments, the pore diameter of the pores on the surface of the hollow fiber membrane filaments is about several hundred nanometers.
As a specific embodiment of the above-mentioned moving membrane bioreactor of the present invention, wherein the spacing between the hollow fiber membrane filaments is 2-4 mm.
As a specific embodiment of the above-mentioned moving-type membrane bioreactor, the hollow fiber membrane filaments may be welded or glued between the upper end cover and the lower end cover.
The specific arrangement position of the support frame between the upper end cover and the lower end cover is not required, and the support frame can be arranged at any position of the upper end cover and the lower end cover close to the edge of the end cover or the center of the end cover according to the field operation requirement by a person skilled in the art as long as the upper end cover and the lower end cover can be firmly supported and fixed.
On the other hand, the invention also provides a sewage treatment system, wherein the sewage treatment system comprises a sewage treatment tank, a plurality of movable membrane bioreactors, a motor, an aeration pump and a finished product water tank, wherein the sewage treatment tank is filled with activated sludge, the movable membrane bioreactors are arranged below the sewage level of the sewage treatment tank, the upper end covers of the movable membrane bioreactors are electrically connected with the rotating shaft of the motor, and aeration pipes are arranged at the periphery, the bottom and the idle rotating shaft of the movable membrane bioreactors;
the movable membrane bioreactor and the aeration pipe are arranged in a plastic net, porous plastic spherical particles are filled between the aeration pipes arranged at the periphery and the bottom of the movable membrane bioreactor and the movable membrane bioreactor, and the porous plastic spherical particles can move along with air flow and enter gaps among hollow fiber membrane filaments of the movable membrane bioreactor when the aeration pipe performs aeration;
the aeration pump is connected with the inlet of the aeration pipe through a gas pipeline and a gas flowmeter;
the raw water pipeline is connected with an inlet of the sewage treatment pool through a water pump and a first flowmeter;
And a water outlet of the lower end cover of the movable membrane bioreactor is connected with a water production pipe, and the water production pipe is connected with the finished product water tank through a vacuum meter, a second flowmeter and a suction pump respectively.
As a specific embodiment of the above sewage treatment system of the present invention, the aeration pipe disposed at the hollow rotating shaft penetrates through the hollow rotating shaft or is disposed around the hollow rotating shaft.
As a specific embodiment of the above sewage treatment system of the present invention, wherein the aperture of the aeration nozzle disposed on the aeration pipe is in the range of 0.3-1.5 mm.
In a specific embodiment of the above sewage treatment system of the present invention, the suction pump is electrically connected to an electromagnetic relay.
In the above sewage treatment system of the present invention, the electromagnetic relay is configured to control a suction ratio of the suction pump.
As a specific embodiment of the above sewage treatment system of the present invention, wherein the density of the porous plastic spherical particles is 1.05-1.15g/cm3The diameter is 2-4 mm.
In a specific embodiment of the above sewage treatment system of the present invention, the amount of the porous plastic spherical particles added is 2 to 3g/L based on the total volume of the sewage treatment tank.
The invention does not make specific requirements on the material of the porous (porous on the surface of the plastic spherical particle) plastic spherical particle, and technicians in the field can reasonably select the material according to the actual operation needs on site; for example, in the embodiment of the present invention, the material of the porous plastic spherical particles may be polyvinyl chloride, polyethylene, polypropylene, polystyrene, and other conventional resins.
In the above sewage treatment system of the present invention, the plastic net is used to block the porous plastic spherical particles so that the porous plastic spherical particles move in the space defined by the plastic net. In addition, the invention does not make specific requirements on the material of the plastic net, the mesh size and the like, and the technical personnel in the field can reasonably set the plastic net according to the actual operation needs on site as long as the aim of the invention can be realized.
When the sewage treatment system works, the porous plastic spherical particles can move along with the disturbance of airflow and enter gaps among hollow fiber membrane filaments of the movable membrane bioreactor when the aeration pipe performs aeration, the membrane filaments cannot be scratched, the surfaces of the hollow fiber membrane filaments can be continuously washed by the movement of the porous plastic spherical particles, membrane pollution can be effectively reduced, and the sewage treatment efficiency is improved;
In addition, the surfaces of the porous plastic spherical particles are porous, and the pore structures can provide a growth environment for activated sludge, so that sludge floc is enlarged, the concentration of the activated sludge in the sewage treatment tank is increased, and the increase of the concentration of the activated sludge is more beneficial to the treatment of raw water.
In the above sewage treatment system of the present invention, the vacuum gauge is used for monitoring the pressure difference between the inside and the outside of the hollow fiber membrane filaments.
In the above sewage treatment system of the present invention, the aeration pump is used for aerating the sewage treatment tank.
In the above sewage treatment system of the present invention, the motor is used to control the rotation speed of the membrane bioreactor.
In the sewage treatment system, the aeration pipe is arranged at the hollow rotating shaft, so that the shearing force effect of aeration on the hollow fiber membrane yarns can be enhanced, and sludge is less likely to be adsorbed on the surfaces of the hollow fiber membrane yarns.
In the above-mentioned sewage treatment system of the present invention, a plurality of independent above-mentioned membrane bioreactors may be disposed in the sewage treatment tank according to the treatment capacity of the raw water.
In still another aspect, the present invention provides a sewage treatment method, wherein the sewage treatment method uses the above sewage treatment system, and comprises the following steps:
(1) After raw water enters a sewage treatment tank, activated sludge in the sewage treatment tank treats the raw water;
(2) and (2) after the water treated by the activated sludge in the step (1) enters a movable membrane bioreactor, rotating the movable membrane bioreactor, carrying out solid-liquid separation on the water in the hollow fiber membrane filaments, and obtaining product water after the separation is finished.
As a specific embodiment of the above-mentioned sewage treatment method of the present invention, wherein the aeration amount in the sewage treatment tank is 200-500L (m)2·h)-1。
As a specific embodiment of the above-mentioned sewage treatment method of the present invention, wherein the concentration of the activated sludge in the sewage treatment tank is 4000-8000 mg/L.
As a specific embodiment of the above-mentioned sewage treatment method of the present invention, wherein the membrane bioreactor is rotated at a rotation speed of 30-60 rpm.
As a specific embodiment of the above-mentioned sewage treatment method of the present invention, wherein the product water is collected by a suction pump, a suction ratio of the suction pump is controlled to be 8:4 to 8: 2.
In the above-described sewage treatment method of the present invention, the raw water is treated by an activated sludge process after entering the sewage treatment tank, and specifically, organic substances in the raw water are treated by adsorption and degradation by activated sludge.
The hollow fiber membrane filaments of the movable membrane bioreactor provided by the invention are fixed between the upper end cover and the lower end cover, the hollow fiber membrane filaments are not easy to be wound together, and the movable membrane bioreactor has a simple structure and is convenient to install; in addition, the hollow fiber membrane filaments can rotate by the following membrane bioreactor, so that membrane pollution can be effectively reduced, and the sewage treatment efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of a dynamic membrane bioreactor provided in example 1 of the present invention.
Fig. 2 is a schematic structural diagram of a sewage treatment system provided in embodiment 2 of the present invention.
FIG. 3 is a schematic structural view of porous plastic spherical particles used in a sewage treatment system according to example 2 of the present invention.
The main reference numbers indicate:
1. a water pump;
201. A first flow meter;
202. a second flow meter;
3. a sewage treatment tank;
4. a motor;
5. a moving membrane bioreactor;
6. a gas flow meter;
7. an aeration pump;
8. a vacuum gauge;
9. an electromagnetic relay;
10. a suction pump;
11. a finished product water tank;
12. an aeration pipe;
13. a hollow rotating shaft;
14. a first header pipe;
15. hollow fiber membrane filaments;
16. a water production pipe;
17. an upper end cover;
18. a lower end cover;
19. a second water collecting pipe;
20. a support frame;
21. a plastic mesh;
22. porous plastic spherical particles;
23. and (4) holes.
Detailed Description
In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention will be made with reference to the following specific examples, which should not be construed as limiting the implementable scope of the present invention.
It should be noted that the term "comprises/comprising" and any variations thereof in the description and claims of this invention and the above-described drawings is intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present invention, the terms "upper", "lower", "inner", "outer", "top" and "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used in other meanings besides orientation or positional relationship, for example, the term "upper" may also be used in some cases to indicate a certain attaching or connecting relationship. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
Furthermore, the terms "disposed" and "connected" should be interpreted broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
Example 1
The embodiment provides a membrane bioreactor, the structural schematic diagram of which is shown in FIG. 1, and as can be seen from FIG. 1, the membrane bioreactor comprises:
the hollow fiber membrane fiber bundle comprises an upper end cover 17, a lower end cover 18, a hollow rotating shaft 13 and a plurality of hollow fiber membrane wires 15, wherein the upper end cover 17 and the lower end cover 18 are of round box-shaped structures with the same size, and a plurality of supporting frames 20 are arranged between the upper end cover 17 and the lower end cover 18 and used for supporting and fixing the upper end cover 17 and the lower end cover 18; a water outlet is formed in the bottom surface of the lower end cover 18;
the hollow rotating shaft 13 is arranged between the upper end cover 17 and the lower end cover 18, and the upper end cover 17 and the lower end cover 18 are communicated at the centers thereof;
the hollow fiber membrane filaments 15 are vertically arranged between the upper end cover 17 and the lower end cover 18, and the hollow fiber membrane filaments 15 are communicated with the upper end cover 17 and the lower end cover 18;
the movable membrane bioreactor can rotate along with the hollow rotating shaft 13.
In this embodiment, the upper outlets of the plurality of hollow fiber membrane filaments 15 are disposed in the ring formed by the bottom edge of the upper cap 17 and the half of the radius of the bottom of the upper cap 17 (i.e., the ring formed between R/2 and R, where R is the radius of the upper cap), and correspondingly, the lower outlets of the plurality of hollow fiber membrane filaments 15 are disposed in the ring formed by the top edge of the lower cap 18 and the half of the radius of the bottom of the lower cap 18 (i.e., the ring formed between R/2 and R, where R is the radius of the lower cap).
In this embodiment, the diameters of the upper end cover 17 and the lower end cover 18 are both 50 cm.
In this embodiment, the number of the supporting frames 20 is 3.
In this embodiment, a first water collecting pipe 14 is arranged in the upper end cover 17, and the outlets at the upper ends of the plurality of hollow fiber membrane filaments 15 are connected with the upper end opening of the hollow rotating shaft 13 through the first water collecting pipe 14.
In this embodiment, a second water collecting pipe 19 is disposed in the lower end cover 18, and the lower end outlets of the plurality of hollow fiber membrane filaments 15 and the lower end opening of the hollow rotating shaft 13 are connected with the water outlet through the second water collecting pipe 19.
In this embodiment, the length of the hollow fiber membrane filaments 15 is 80 cm.
In this embodiment, the diameter of the hollow fiber membrane filaments 15 is 1-2 mm.
In this embodiment, the pore diameter of the pores on the surface of the hollow fiber membrane filaments 15 is less than 0.6 μm.
In this embodiment, the distance between the hollow fiber membrane filaments 15 is 3 mm.
Example 2
The present embodiment provides a sewage treatment system, a schematic structural diagram of which is shown in fig. 2, and as can be seen from fig. 2, the sewage treatment system includes a sewage treatment tank 3, a set of dynamic membrane bioreactor 5 provided in embodiment 1, a motor 4, an aeration pump 7 and a finished product water tank 11, active sludge is contained in the sewage treatment tank 3, the dynamic membrane bioreactor 5 is disposed below the sewage level of the sewage treatment tank 3, an upper end cover 17 of the dynamic membrane bioreactor 5 is electrically connected with a rotating shaft of the motor 4, and aeration pipes 12 are disposed around, at the bottom of the dynamic membrane bioreactor 5 and at an idle shaft 13 therein;
The movable membrane bioreactor 5 and the aeration pipe 12 are arranged in a plastic net 21, porous plastic spherical particles 22 are filled between the aeration pipe 12 arranged at the periphery and the bottom of the movable membrane bioreactor 5 and the movable membrane bioreactor 5, and the porous plastic spherical particles 22 can move along with air flow and enter gaps among hollow fiber membrane filaments 15 of the movable membrane bioreactor 5 when the aeration pipe 12 is aerated;
the aeration pump 7 is connected with the inlet of the aeration pipe 12 through a gas pipeline (the gas pipeline passes through the plastic net 21) via a gas flow meter 6;
the raw water pipeline is connected with the inlet of the sewage treatment pool 3 through a water pump 1 and a first flowmeter 201;
the water outlet of the lower end cover 18 of the moving membrane bioreactor 5 is connected with a water production pipe 16 (the water production pipe penetrates through the plastic net 21), and the water production pipe 16 is respectively connected with the finished product water tank 11 through a vacuum meter 8, a second flowmeter 202 and a suction pump 10.
In this embodiment, a schematic structural diagram of the porous plastic spherical particles 22 is shown in fig. 3, and as can be seen from fig. 3, the surface of the porous plastic spherical particles includes a plurality of holes 23, wherein the material of the porous plastic spherical particles may be polyvinyl chloride.
In this example, the porous plastic spherical particles had a density of 1.05-1.15g/cm3The diameter is 2 mm.
In the embodiment, the adding amount of the porous plastic spherical particles is 2g/L based on the total volume of the sewage treatment tank.
In this embodiment, the hollow rotating shaft 13 is provided with aeration pipes 12 at its periphery.
In this embodiment, the aperture of the aeration nozzle disposed on the aeration pipe 12 is in the range of 0.3-1.5 mm.
In this embodiment, the suction pump 10 is electrically connected to an electromagnetic relay 9.
Example 3
The present embodiment provides a sewage treatment method, wherein the sewage treatment method is implemented by using the sewage treatment system provided in embodiment 2, and the method includes the following specific steps:
(1) sewage (COD is 300-500mg/L) enters a sewage treatment pool through a water pump and a first flow meter, and the activated sludge in the sewage treatment pool adsorbs and degrades organic matters in the sewage;
(2) and (2) after the sewage treated by the activated sludge in the step (1) enters the hollow fiber membrane filaments of the movable membrane bioreactor, rotating the movable membrane bioreactor, performing solid-liquid separation on water in the hollow fiber membrane filaments to obtain product water after the separation is finished, finally converging the product water into a second water collecting pipe in the lower end cover, collecting the product water through a suction pump, and sending the product water to a finished product water tank through a product water pipe.
This exampleIn the wastewater treatment tank, the aeration amount is 300L (m)2·h)-1The concentration of the activated sludge in the sewage treatment tank is 8000mg/L, the rotating speed of the moving-type membrane bioreactor is 30 r/min, and the flux is controlled to be 25L/m2H, the suction ratio of the suction pump is 8: 3.
Comparative example 1
The comparative example provides a sewage treatment system, wherein the sewage treatment system comprises a sewage treatment tank, a membrane bioreactor with a hollow fiber curtain type membrane component, an aeration pump and a finished product water tank, wherein the conventional membrane bioreactor in the field is provided with the hollow fiber curtain type membrane component, activated sludge is contained in the sewage treatment tank, the membrane bioreactor is arranged below the sewage liquid level of the sewage treatment tank, aeration pipes are arranged at the periphery and the bottom of the membrane bioreactor, and the aeration pump is connected with the inlets of the aeration pipes through a gas pipeline and a gas flow meter;
the raw water pipeline is connected with an inlet of the sewage treatment pool through a water pump and a first flowmeter;
and a water outlet of the lower end cover of the membrane bioreactor is connected with a water production pipe, and the water production pipe is connected with the finished product water tank through a vacuum meter, a second flowmeter and a suction pump respectively.
In this embodiment, the aperture of the aeration nozzle disposed on the aeration pipe is in the range of 0.3-1.5 mm.
In this embodiment, the suction pump is electrically connected to an electromagnetic relay 9.
Comparative example 2
The present comparative example provides a sewage treatment method, wherein the sewage treatment method is implemented by using the sewage treatment system provided in comparative example 1, and the method comprises the following specific steps:
(1) sewage (COD is 300-;
(2) and (2) after the sewage treated by the activated sludge in the step (1) enters a vertical curtain type hollow fiber membrane of a membrane bioreactor, performing solid-liquid separation on the water in the vertical curtain type hollow fiber membrane to obtain product water after the separation is finished, finally converging the product water into a second water collecting pipe in a lower end cover, collecting the product water through a suction pump, and sending the product water to a finished product water tank through a product water pipe.
In this example, the aeration rate in the wastewater treatment tank was 300L (m)2·h)-1The concentration of the activated sludge in the sewage treatment tank is 8000mg/L, and the flux is controlled to be 25L/m2H, the suction ratio of the suction pump is 8: 3.
The data of the results obtained in inventive example 3 and comparative example 2 are shown in table 1 below.
TABLE 1
As can be seen from table 1, compared with the sewage treatment system and method including the conventional membrane bioreactor with the curtain type hollow fiber membrane in the prior art, the effluent has lower concentrations of COD and suspended matters after the sewage is treated by using the sewage treatment system and method provided by the invention; in addition, as can be seen from table 1, under the same sewage treatment condition, the operation time of the sewage treatment system (moving membrane bioreactor) provided by the embodiment of the present invention is as long as 55 days, while the operation time of the conventional sewage treatment system (membrane bioreactor with a curtain type hollow fiber membrane) in the art is only 14 days, and the effluent quality after the sewage treatment system provided by the embodiment of the present invention operates for 55 days is still better than that after the conventional sewage treatment system in the art operates for 14 days, which indicates that the moving membrane bioreactor provided by the embodiment of the present invention can indeed effectively slow down membrane pollution.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.
Claims (21)
1. A movable membrane bioreactor comprises an upper end cover, a lower end cover, a hollow rotating shaft and a plurality of hollow fiber membrane filaments, wherein the upper end cover and the lower end cover are of box-shaped structures, and a plurality of support frames are arranged between the upper end cover and the lower end cover and used for supporting and fixing the upper end cover and the lower end cover; a water outlet is formed in the bottom surface of the lower end cover;
the hollow rotating shaft is arranged between the upper end cover and the lower end cover, and the upper end cover and the lower end cover are communicated at the centers of the upper end cover and the lower end cover;
the hollow fiber membrane filaments are vertically arranged between the upper end cover and the lower end cover and are communicated with the upper end cover and the lower end cover;
the movable membrane bioreactor can rotate along with the hollow rotating shaft.
2. The membrane bioreactor of claim 1, wherein the upper and lower end caps are circular.
3. The membrane bioreactor of claim 2, wherein the upper end cover and the lower end cover are both 40cm to 100cm in diameter.
4. The membrane bioreactor of claim 1, wherein the number of support frames is 3-5.
5. The membrane bioreactor according to claim 1, wherein a water collecting pipe is arranged in the upper end cover, and the outlets at the upper ends of the hollow fiber membrane filaments are connected with the upper port of the hollow rotating shaft through the water collecting pipe.
6. The membrane bioreactor according to claim 1, wherein a water collecting pipe is arranged in the lower end cover, and the lower end outlets of the hollow fiber membrane filaments and the lower end opening of the hollow rotating shaft are connected with the water outlet through the water collecting pipe.
7. The dynamic membrane bioreactor of claim 1, wherein the length of said hollow fiber membrane filaments is 40-100 cm.
8. The membrane bioreactor according to claim 1 or 7, wherein the hollow fiber membrane filaments have a diameter of 1-2 mm.
9. The membrane bioreactor according to claim 1 or 7, wherein the pores contained in the surface of the hollow fiber membrane filaments have a pore size of less than 0.6 μm.
10. An active membrane bioreactor according to claim 1 or 7 wherein the spacing of the hollow fibre membrane filaments is between 2 and 4 mm.
11. A sewage treatment system, wherein the sewage treatment system comprises a sewage treatment tank, a plurality of dynamic membrane bioreactors of any one of claims 1 to 10, a motor, an aeration pump and a finished product water tank, wherein activated sludge is contained in the sewage treatment tank, the dynamic membrane bioreactors are arranged below the sewage level of the sewage treatment tank, an upper end cover of each dynamic membrane bioreactor is electrically connected with a rotating shaft of the motor, and aeration pipes are arranged at the periphery, the bottom and an idle rotating shaft of each dynamic membrane bioreactor;
the movable membrane bioreactor and the aeration pipe are arranged in a plastic net, porous plastic spherical particles are filled between the aeration pipes arranged at the periphery and the bottom of the movable membrane bioreactor and the movable membrane bioreactor, and the porous plastic spherical particles can move along with air flow when the aeration pipes aerate and enter gaps among hollow fiber membrane filaments of the movable membrane bioreactor;
the aeration pump is connected with the inlet of the aeration pipe through a gas pipeline and a gas flowmeter;
The raw water pipeline is connected with an inlet of the sewage treatment pool through a water pump and a first flow meter;
and a water outlet of the lower end cover of the dynamic membrane bioreactor is connected with a water production pipe, and the water production pipe is respectively connected with the finished product water tank through a vacuum meter, a second flowmeter and a suction pump.
12. The wastewater treatment system according to claim 11, wherein the aeration pipe provided at the hollow rotating shaft passes through or is provided around the hollow rotating shaft.
13. The sewage treatment system according to claim 11 or 12 wherein the aperture of the aeration nozzle provided on the aeration pipe is in the range of 0.3 to 1.5 mm.
14. The wastewater treatment system of claim 11 or 12, wherein the suction pump is electrically connected with an electromagnetic relay.
15. The wastewater treatment system according to claim 11 or 12, wherein the porous plastic spherical particles have a density of 1.05-1.15g/cm3The diameter is 2-4 mm.
16. The wastewater treatment system according to any of claims 11-15, wherein the porous plastic spherical particles are added in an amount of 2-3g/L based on the total volume of the wastewater treatment tank.
17. A sewage treatment method using the sewage treatment system according to any one of claims 11 to 16, comprising the steps of:
(1) After raw water enters a sewage treatment tank, activated sludge in the sewage treatment tank treats the raw water;
(2) and (2) after the water treated by the activated sludge in the step (1) enters a movable membrane bioreactor, rotating the movable membrane bioreactor, carrying out solid-liquid separation on the water in the hollow fiber membrane filaments, and obtaining product water after the separation is finished.
18. The wastewater treatment method according to claim 17, wherein the aeration rate in the wastewater treatment tank is 200- & lt 500- & gt (m-2·h)-1。
19. The wastewater treatment method according to claim 17 or 18, wherein the concentration of the activated sludge in the wastewater treatment tank is 4000-8000 mg/L.
20. The wastewater treatment method according to claim 17 or 18, wherein the membrane bioreactor is rotated at a rotation speed of 30 to 60 rpm.
21. The wastewater treatment method according to claim 17 or 18, wherein the product water is collected by a suction pump whose suction ratio is controlled to be 8:4-8: 2.
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| JP2007203219A (en) * | 2006-02-02 | 2007-08-16 | Matsushita Electric Works Ltd | Membrane separation type water purifier |
| CN101475287A (en) * | 2009-01-06 | 2009-07-08 | 环境保护部华南环境科学研究所 | Novel membrane-biological membrane reactor system and use thereof |
| CN210012708U (en) * | 2019-05-02 | 2020-02-04 | 廖雪琴 | Sewage MBR integration treatment facility with second grade decomposes pond |
| CN111099724A (en) * | 2020-01-14 | 2020-05-05 | 厦门理工学院 | Anaerobic reciprocating type rotary hollow fiber membrane bioreactor and operation method |
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Patent Citations (4)
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|---|---|---|---|---|
| JP2007203219A (en) * | 2006-02-02 | 2007-08-16 | Matsushita Electric Works Ltd | Membrane separation type water purifier |
| CN101475287A (en) * | 2009-01-06 | 2009-07-08 | 环境保护部华南环境科学研究所 | Novel membrane-biological membrane reactor system and use thereof |
| CN210012708U (en) * | 2019-05-02 | 2020-02-04 | 廖雪琴 | Sewage MBR integration treatment facility with second grade decomposes pond |
| CN111099724A (en) * | 2020-01-14 | 2020-05-05 | 厦门理工学院 | Anaerobic reciprocating type rotary hollow fiber membrane bioreactor and operation method |
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