CN211595188U

CN211595188U - Parallel AAO-MBR reactor

Info

Publication number: CN211595188U
Application number: CN202020125369.6U
Authority: CN
Inventors: 赖信可; 赖志鹏; 卢凤华; 张远斌; 李俊贤; 庄烨
Original assignee: Fujian Longking Co Ltd.
Current assignee: Fujian Longking Co Ltd.
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2020-09-29
Anticipated expiration: 2030-01-19

Abstract

The utility model relates to a parallel AAO-MBR reactor, which comprises an aerobic zone, an anaerobic zone, an anoxic zone and a mud-water separator, wherein the anaerobic zone and the anoxic zone are respectively provided with a sewage inlet, an MBR membrane component is arranged in the aerobic zone, and the bottom in the aerobic zone is provided with a micropore aeration device; the outlet of the anaerobic zone and the outlet of the anoxic zone are respectively communicated with the aerobic zone; the anaerobic treatment device also comprises a reflux pump which is used for pumping the mixed liquid in the aerobic zone into the mud-water separator, a mud outlet of the mud-water separator is communicated with the anaerobic zone, and a water outlet of the mud-water separator is communicated with the anoxic zone. The volume of the reactor is reduced while the effect of nitrogen and phosphorus removal of the sewage to the system is ensured.

Description

Parallel AAO-MBR reactor

Technical Field

The utility model relates to a sewage treatment technical field, concretely relates to parallel AAO-MBR reactor.

Background

The integrated membrane bioreactor is widely applied to sewage treatment in various industries as a novel efficient sewage treatment device, integrates the characteristics of the traditional biological treatment technology and the novel membrane separation technology, greatly reduces the volume of a sewage treatment facility, and optimizes the treatment effect. However, in recent decades, with the wide application of chemical fertilizers, pesticides, detergents and the like, nitrogen and phosphorus pollution and water eutrophication become more serious, and China also puts forward higher and stricter standards and requirements on nitrogen and phosphorus discharge, so that the future integrated membrane bioreactor is required to have better nitrogen and phosphorus removal performance while maintaining the existing advantages.

The AAO sewage treatment process is a common sewage treatment process, and realizes dephosphorization and denitrification and organic matter removal by utilizing microbial flora. The main process comprises three functional areas, namely an anaerobic area, an anoxic area and an aerobic area, which are sequentially arranged, and is the most mainstream synchronous nitrogen and phosphorus removal process at present, after an AAO process is combined with an MBR process, a membrane assembly is arranged in the aerobic area to replace a secondary sedimentation tank at the tail end of the traditional AAO process, and a mode of sedimentation supernatant and overflow water outflow of the secondary sedimentation tank is replaced by a mode of membrane filtration water outflow, so that the sludge age (SRT) and Hydraulic Retention Time (HRT) are separated, different sludge ages are considered, in addition, under the interception effect of a membrane, the sludge concentration in the combined AAO-MBR process is greatly increased compared with that in the traditional activated sludge method, and the higher biomass is achieved under the same volume, and the changes are favorable for improving the nitrogen and phosphorus removal effect of a biochemical system. Therefore, it is expected that the AAO-MBR will be one of the mainstream integrated sewage treatment processes of the integrated membrane bioreactor in the future.

In the AAO process, nitrifying bacteria in an aerobic zone convert ammonia nitrogen into nitrate/nitrite nitrogen, nitrifying liquid containing the nitrate/nitrite nitrogen flows back to an anoxic zone from the aerobic zone through backflow, and denitrifying bacteria convert the nitrate/nitrite nitrogen into nitrogen to realize denitrification; phosphorus releasing of the phosphorus-accumulating bacteria in the anaerobic zone and excessive phosphorus absorption in the aerobic zone, and continuously enriching phosphorus to form phosphorus-rich sludge by repeating the process of refluxing the phosphorus-accumulating bacteria through refluxing to realize phosphorus removal. It can be seen that denitrification requires reflux of nitrifying liquid, phosphorus removal requires reflux of phosphorus accumulating bacteria, the MBR process replaces a secondary sedimentation tank with a membrane module, the sludge concentration in the system is increased, the characteristic of the traditional AAO process reflux is changed, the respective reflux of the nitrifying liquid and the phosphorus accumulating bacteria cannot be realized, the reflux of the nitrifying liquid is accompanied by the reflux of the phosphorus accumulating bacteria, the reflux brings the phosphorus accumulating bacteria in an aerobic zone to an anoxic zone, and brings the nitrifying liquid in the aerobic zone to an anaerobic zone, which are ineffective for the denitrification and phosphorus removal processes, and a larger reflux amount is required for refluxing enough nitrate/nitrite nitrogen and phosphorus accumulating bacteria. In addition, the sludge flowing back to the anaerobic zone from the anoxic zone can carry denitrifying bacteria and part of nitrate/nitrite nitrogen to enter the anaerobic zone to compete with the phosphorus-accumulating bacteria for a carbon source, and the competitive capacity of the denitrifying bacteria on the carbon source is far greater than that of the phosphorus-accumulating bacteria, so that the phosphorus release effect of the phosphorus-accumulating bacteria is influenced, and the removal of phosphorus is influenced. In the design process of the volume of the reactor, the ineffective reflux quantity needs to be considered, so the effective residence time of the reactor is greatly wasted, and the volume of the reactor is over designed.

Therefore, how to reduce the volume of the AAO-MBR reactor while ensuring the effect of denitrification and dephosphorization of the sewage on the system is a technical problem to be solved by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a parallel AAO-MBR reactor reduces the reactor volume when guaranteeing to sewage to system nitrogen and phosphorus removal effect.

In order to solve the technical problem, the utility model provides a parallel AAO-MBR reactor, which comprises an aerobic zone, an anaerobic zone, an anoxic zone and a mud-water separator, wherein the anaerobic zone and the anoxic zone are respectively provided with a sewage inlet, an MBR membrane component is arranged in the aerobic zone, and the bottom in the aerobic zone is provided with a micropore aeration device; the outlet of the anaerobic zone and the outlet of the anoxic zone are respectively communicated with the aerobic zone; the anaerobic tank is characterized by further comprising a reflux pump, wherein the reflux pump is used for pumping the mixed liquid in the aerobic zone into the mud-water separator, a mud outlet of the mud-water separator is communicated with the anaerobic zone, and a water outlet of the mud-water separator is communicated with the anoxic zone.

Mixed liquor (including mud and sewage) in the aerobic zone can get into mud-water separator and carry out mud-water separation under the effect of backwash pump in, mud (backflow mud) after the separation flows back to in the anaerobic zone again, and supernatant (backwash liquid) after the separation then flows back to in the anoxic zone again, the MBR membrane module is located in the aerobic zone, when the sewage in the aerobic zone of discharging, can hold back mud, make the more traditional mud concentration of mud concentration in the aerobic zone increase by a wide margin, reach bigger biomass under the same volume, be favorable to improving system's nitrogen and phosphorus removal effect, and can reduce whole volume.

The parallel AAO-MBR reactor is provided with two sewage inlets, one sewage inlet is arranged in the anaerobic zone, the other sewage inlet is arranged in the anoxic zone, the anoxic zone and the anaerobic zone are arranged in parallel and are independent of each other, the dephosphorization process and the denitrification process are respectively carried out, and two processes share one aerobic zone. In the dephosphorization process, water does not move and mud moves, phosphorus-accumulating bacteria complete the process of releasing phosphorus under anaerobic condition and absorbing phosphorus under aerobic condition to form phosphorus-rich sludge by means of reflux; the denitrification process is a process that water is used for driving sludge to be immobile, denitrifying bacteria are in an anoxic zone, nitrifying bacteria are in an aerobic zone, and ammonia nitrogen is converted into nitrate/nitrite nitrogen through nitrification reaction of the nitrifying bacteria in the aerobic zone by depending on the reflux of nitrifying liquid, and then the ammonia nitrogen is converted into nitrogen through denitrification reaction of the denitrifying bacteria in the anoxic zone. And the sludge-water separator is arranged to separate sludge and water of the mixed liquid returned from the aerobic zone, the returned sludge is introduced into the anaerobic zone after separation, so that the influence of dissolved oxygen and nitrate/nitrite nitrogen in the mixed liquid on anaerobic phosphorus release of sludge in the anaerobic tank can be avoided, the returned liquid is introduced into the anoxic zone, so that the influence of phosphorus accumulating bacteria in the mixed liquid on denitrifying bacteria in the anoxic zone can be avoided, most of nitric acid/nitrite is returned to the anoxic zone, and the denitrification capability is ensured.

And, because the denitrification process need not to pass through anaerobic environment, the dephosphorization process need not the anoxic zone, therefore, after dephosphorization process and denitrification process set up independently, the mud in the dephosphorization process only passes through anaerobic zone and aerobic zone and need not to pass through the anoxic zone, the sewage in the denitrification process only passes through anoxic zone and aerobic zone and need not to pass through the anaerobic zone, two processes can both avoid passing through invalid function area, and then avoid the waste of reaction zone pool volume, reduce the redundant volume of reaction zone, make this parallel AAO-MBR reactor's effective volume high, can reduce the reactor volume.

Optionally, the bottom of the anaerobic zone and the anoxic zone are respectively provided with a perforated aeration device.

Optionally, suspended fillers are respectively arranged in the aerobic zone and the anoxic zone.

Optionally, the mud-water separator comprises an inclined plate separation region, a water collection region and a mud bucket, the inclined plate separation region is circumferentially arranged on the outer side of the water collection region, and the mud bucket is arranged below the inclined plate separation region; after the mixed liquor is separated by the inclined plate separation zone, sludge can fall to the mud bucket, and sewage can move upwards and overflow into the water collection zone; the bottom outlet of the water collecting area forms a water outlet of the mud-water separator, and the bottom outlet of the mud bucket forms a mud outlet of the mud-water separator.

Optionally, the mud-water separator further comprises a cyclone separation zone arranged outside the inclined plate separation zone, and the bottom of the cyclone separation zone is communicated with the bottom of the inclined plate separation zone; the reflux pump can pump the mixed liquid in the aerobic zone into the cyclone separation zone along the tangential direction.

Optionally, the mud-water separator further comprises an overflow groove circumferentially arranged along the top end of the water collecting area, and the height of the outer edge of the overflow groove is higher than the height of the inner edge of the overflow groove.

Optionally, the mud supplementing pipe is communicated between the mud bucket and the water outlet, and one end of the mud supplementing pipe facing the mud bucket is higher than one end facing the water outlet.

Optionally, the mud-water separator (4) is located above the aerobic zone, the aerobic zone is of a cylindrical structure, the anaerobic zone and the anoxic zone are arranged outside the cylindrical structure and surround to form a cylindrical cavity wrapped outside the aerobic zone.

Drawings

FIG. 1 is a block diagram of a parallel AAO-MBR reactor provided in an embodiment of the present invention;

FIG. 2 is a schematic diagram of the internal structure of a parallel AAO-MBR reactor;

FIG. 3 is a schematic diagram of the mud-water separator of FIG. 2;

FIG. 4 is a top view of FIG. 3;

FIG. 5 is a top view of the mud-water separator of FIG. 2.

In the accompanying fig. 1-5, the reference numerals are illustrated as follows:

1-an aerobic zone;

2-anaerobic zone, 21-outlet of anaerobic zone;

3-anoxic zone, 31-outlet of anoxic zone;

4-mud-water separator, 41-mud outlet, 42-water outlet, 43-sloping plate separation zone, 44-water collection zone, 45-mud bucket, 46-cyclone separation zone, 461-tangential inlet, 47-overflow groove and 48-mud supplementing pipe;

5-MBR membrane module;

6-reflux pump;

7-a sewage inlet;

81-blower, 82-microporous aeration device, 83-perforated aeration device.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1-5, fig. 1 is a block diagram of a parallel AAO-MBR reactor according to an embodiment of the present invention; FIG. 2 is a schematic diagram of the internal structure of a parallel AAO-MBR reactor; FIG. 3 is a schematic diagram of the mud-water separator of FIG. 2; FIG. 4 is a top view of FIG. 3; FIG. 5 is a top view of the mud-water separator of FIG. 2.

The embodiment of the utility model provides a parallel AAO-MBR reactor, as shown in figure 1 and figure 2, this parallel AAO-MBR reactor includes aerobic zone 1, anaerobic zone 2, anoxic zone 3 and mud-water separator 4, wherein, anaerobic zone 2 and anoxic zone 3 are equipped with sewage entry 7 respectively, be equipped with MBR membrane module 5 in the aerobic zone 1, and the bottom of this aerobic zone 1 is equipped with micropore aeration equipment 82, be used for letting in the microbubble in the aerobic zone 1 for aerobic microorganism oxygen suppliment in the aerobic zone 1, in aerobic zone 1, the pollutant is got rid of by the degradation. The outlet 21 of the anaerobic zone is communicated with the aerobic zone 1, and the outlet 31 of the anoxic zone is communicated with the aerobic zone 1. That is, the anaerobic zone 2 and the anoxic zone 3 are connected in parallel, the anaerobic zone 2 is connected in series with the aerobic zone 1 and the sludge-water separator 4 to remove phosphorus from the wastewater, and the anoxic zone 3 is connected in series with the aerobic zone 1 and the sludge-water separator 4 to remove nitrogen from the wastewater.

The parallel AAO-MBR reactor also comprises a reflux pump 6 which is used for pumping the mixed liquid in the aerobic zone 1 into the sludge-water separator 4, a sludge outlet 41 of the sludge-water separator 4 is communicated with the anaerobic zone 2, and a water outlet 42 of the sludge-water separator 4 is communicated with the anoxic zone 3.

Mixed liquor (including mud and sewage) in the aerobic zone 1 can enter a mud-water separator 4 for mud-water separation under the action of a reflux pump 6, separated mud (reflux mud) flows back to the anaerobic zone 2 again, separated supernatant (reflux liquid) flows back to the anoxic zone 3 again, an MBR (membrane bioreactor) membrane component 5 is arranged in the aerobic zone 1, when the sewage in the aerobic zone 1 is discharged, the sludge can be intercepted, so that the sludge concentration in the aerobic zone 1 is greatly increased compared with the traditional sludge concentration, larger biomass is achieved under the same volume, the nitrogen and phosphorus removal effect of the system is favorably improved, and the overall volume can be reduced.

This parallel AAO-MBR reactor is equipped with two sewage entry 7, and anaerobic zone 2 is located to a sewage entry 7, and anoxic zone 3 and anaerobic zone 2 parallel arrangement are independent each other, and dephosphorization process and denitrogenation process go on respectively, and two processes share an aerobic zone 1. The dephosphorization process and the denitrification process are described in detail below.

And (3) denitrification process: nitrifying bacteria in the aerobic zone 1 carry out nitrification to convert ammonia nitrogen into nitrate/nitrite nitrogen, the nitrate/nitrite nitrogen enters the sludge-water separator 4 along with reflux under the action of the reflux pump 6, the nitrate nitrogen/nitrite nitrogen flows back to the anoxic zone 3 along with the reflux to be mixed with sewage led into the anoxic zone 3 after mixed liquor is separated by the sludge-water separator 4 in the sludge-water separator 4, denitrifying bacteria in the anoxic zone 3 carry out denitrification reaction by utilizing the reflux nitrate/nitrite nitrogen and a carbon source in the sewage, and the nitrate/nitrite nitrogen is reacted into nitrogen to remove nitrogen in the sewage. Separating to complete the circulation of oxygen deficiency and oxygen deficiency.

And (3) dephosphorization process: the mixed liquor enters the anaerobic zone 2 after being separated by the mud-water separator 4, then can be mixed with sewage which is introduced into the anaerobic zone 2, the organic matters in the water are absorbed by the polyphosphate bacteria in the anaerobic zone 2, and the polyphosphate bacteria are converted into poly beta-hydroxyalkanoates (PHAs) which are stored in cells and release phosphates (hereinafter referred to as phosphate release), then the polyphosphate bacteria are discharged into the aerobic zone 1 from an outlet 21 of the anaerobic zone, the PHAs in the body are oxidized and decomposed by the polyphosphate bacteria under aerobic conditions to synthesize glycogen, and meanwhile, the phosphate in the water is excessively absorbed to synthesize polyphosphate, thereby achieving the purpose of removing phosphorus. The phosphorus-accumulating bacteria enter the sludge-water separator 4 under the action of the reflux pump 6, sewage is separated from sludge in the sludge-water separator 4, and the phosphorus-accumulating bacteria reflux to the anaerobic zone 2 along with the reflux sludge to complete the anaerobic-aerobic process.

According to the phosphorus removal process and the nitrogen removal process, the phosphorus removal process is' water does not move mud, phosphorus-accumulating bacteria complete the process of releasing phosphorus under an anaerobic condition by means of backflow, and excessively absorb phosphorus under an aerobic condition to form phosphorus-rich sludge; the denitrification process is a process that water is used for driving sludge to be immobile, denitrifying bacteria are in the anoxic zone 3, nitrifying bacteria are in the aerobic zone 1, and the ammonia nitrogen is converted into nitrate/nitrite nitrogen through the nitrifying bacteria nitration reaction in the aerobic zone and is converted into nitrogen through the denitrifying bacteria denitrification reaction in the anoxic zone by means of the reflux of nitrifying liquid. And the sludge-water separator 4 is arranged to separate sludge and water of the mixed liquid returned from the aerobic zone 1, the returned sludge is introduced into the anaerobic zone 2 after separation, so that the influence of dissolved oxygen and nitrate/nitrite nitrogen in the mixed liquid on anaerobic phosphorus release of sludge in the anaerobic tank can be avoided, the returned liquid is introduced into the anoxic zone 3, the influence of phosphorus accumulating bacteria in the mixed liquid on denitrifying bacteria in the anoxic zone 3 can be avoided, and most of nitric acid/nitrite is returned to the anoxic zone 3, so that the denitrification capability is ensured.

And, because the denitrogenation process need not to pass through anaerobic environment, the dephosphorization process need not to pass through anoxic zone 3, therefore, after setting up dephosphorization process and denitrogenation process separately independently, the mud in the dephosphorization process only passes through anaerobic zone 2 and aerobic zone 1 and need not to pass through anoxic zone 3, the sewage in the denitrification process only passes through anoxic zone 3 and aerobic zone 1 and need not to pass through anaerobic zone 2, two flows all can avoid passing through ineffective function area, and then avoid the waste of reaction zone pool volume, reduce the redundant volume of reaction zone, make the effective volume of this parallel AAO-MBR reactor high, can reduce whole volume.

In addition, the phosphorus-rich sludge in the system is discharged through the discharge of the excess sludge, the phosphorus in the system is discharged, and the sludge after mud-water separation is mainly the phosphorus-rich sludge, so that the effective sludge discharge amount is improved, and the sludge discharge effect is optimized.

In the above embodiment, a blower 81 is further included, and aeration means communicating with the blower 81 are respectively provided at the bottom in each reaction zone (including the aerobic zone 1, the anaerobic zone 2 and the anoxic zone 3), and the blower 81 is used to supply air to the aeration means. The anaerobic zone 2 and the anoxic zone 3 are provided with perforated aeration devices 83 to introduce large-volume bubbles into the anaerobic zone 2 and the anoxic zone 3, so as to stir the mixed liquid in the anaerobic zone 2 and the anoxic zone 3 and prevent sludge from depositing at the bottom. Specifically, the aerator further comprises a blower 81, and the blower 81 is communicated with the micropore aeration device 82 and the perforation aeration device 83. Alternatively, in this embodiment, the mixed liquid in the anaerobic zone 2 and the anoxic zone 3 may be stirred by providing a stirrer, which is not particularly limited, but the mixed liquid may be stirred by the perforated aeration device 83, thereby simplifying the overall structure.

In the above embodiment, the suspended fillers are respectively arranged in the aerobic zone 1 and the anoxic zone 3, so that the nitrifying bacteria in the aerobic zone 1 are attached to the surface of the suspended fillers, and the denitrifying bacteria in the anoxic zone 3 are attached to the surface of the suspended fillers, which is beneficial to enhancing the enrichment of the nitrifying bacteria in the aerobic zone 1 and the denitrifying bacteria in the anoxic zone 3, enhancing the nitrification reaction in the aerobic zone 1 and the denitrification reaction in the anoxic zone 3, and further improving the denitrification capability of the system.

In the above embodiment, as shown in fig. 3 and 4, the mud-water separator 4 includes an inclined plate separation region 43, a water collection region 44 and a mud bucket 45, the inclined plate separation region 43 is circumferentially disposed outside the mud-water separation region, the mud bucket 45 is disposed below the inclined plate separation region 43, the mixed liquid in the aerobic region 1 is pumped into the mud-water separator 4 by the action of the reflux pump 6 and enters the inclined plate separation region 43, according to the shallow pool theory, the supernatant liquid in the mixed liquid can overflow upwards into the water collection region 44, the sludge falls downwards into the mud bucket 45 at the bottom under the action of gravity, the bottom outlet of the water collection region 44 forms the water outlet 42 of the mud-water separator 4 and is communicated with the anoxic region 3, and the bottom outlet of the mud bucket 45 forms the sludge outlet 41 of the mud-water separator 4 and is communicated with the anaerobic region 2.

Further, mud-water separator 4 is still including locating the cyclone 46 outside swash plate separation region 43, the bottom of this cyclone 46 and the bottom intercommunication of swash plate separation region 43, this cyclone 46's lateral wall is equipped with tangential entry 461, backwash pump 6 can be with the mixed liquid in the aerobic zone 1 along tangential entry 461 letting in cyclone 46, mixed liquid gets into cyclone 46 and carries out initial segregation under the effect of centrifugal force in, follow the bottom and get into in swash plate separation region 43 afterwards, and mixed liquid is at the in-process that rises, carry out the secondary separation, with further promotion separation effect.

In addition, the mixed liquor has certain initial speed when entering the sludge-water separator 4 under the action of the reflux pump 6, after entering the cyclone separation zone 46 along the tangential direction, the mixed liquor flows along the inner wall of the cyclone separation zone 46, the initial separation is realized by utilizing the density difference of the sludge under the action of centrifugal force, and then the mixed liquor is introduced into the inclined plate separation zone 43 from the bottom, so that the speed of the mixed liquor in the cyclone separation zone 46 is reduced, and the direct impact on the settled sludge in the inclined plate separation zone 43 is avoided.

In the above embodiment, the mud-water separator 4 further includes an overflow trough 47 disposed at the top end of the water collection area 44, the overflow trough 47 is circumferentially disposed at the top end of the water collection area 44, and the height of an outer edge of the overflow trough 47 is higher than the height of an inner edge, wherein the outer edge is a side edge facing the inclined plate separation area 43, the inner edge is a side edge facing the water collection area 44, and a bottom plate is connected between the outer edge and the inner edge to form an overflow trough.

In the above embodiment, the mud-water separator 4 further includes a mud-supplementing pipe 48 communicated between the mud bucket 45 and the water outlet 42, wherein an end of the mud-supplementing pipe 48 facing the mud bucket 45 is higher than an end facing the water outlet 42, and the mud in the mud bucket 45 can flow into the water outlet 42 along the mud-supplementing pipe 48 and flow back to the anoxic zone 3 along with the reflux liquid, so as to supplement the mud concentration in the anoxic zone 3, so that the mud concentration in the anoxic zone 3 maintains a stable equilibrium state. That is, the reflux liquid separated by the mud-water separator 4 flows into the anoxic zone 3, and the reflux sludge separated by the mud-water separator 4 mostly flows back into the anaerobic zone 2 and a small part flows back into the anoxic zone 3.

In the above embodiment, the sludge-water separator 4 is located above the aerobic zone 1, as shown in fig. 5, the aerobic zone 1 is in a cylindrical structure, and the anaerobic zone 2 and the anoxic zone 3 are arranged outside the cylindrical structure and enclose to form a cylindrical cavity wrapped outside the aerobic zone 1. Wherein, the cross-section in anaerobic zone 2 is the semicircle ring, and the cross-section in anoxic zone 3 also is the semicircle ring, and anaerobic zone 2 and anoxic zone 3 can enclose to close and form the cylinder structure of cover locating outside aerobic zone 1, that is to say, aerobic zone 1, anaerobic zone 2 and anoxic zone 3 constitute a cylinder reaction zone, and this cylinder reaction zone is equipped with two inlet tubes that communicate with anaerobic zone 2 and anoxic zone 3 respectively to each inlet tube all is provided with the water intaking valve. Or, in this embodiment, the shape and structure of the aerobic zone 1, the anaerobic zone 2 and the anoxic zone 3 are not limited, for example, the aerobic zone 1, the anaerobic zone 2 and the anoxic zone 3 may be respectively configured to have a square cross-section structure, the aerobic zone 1 may be configured to have a cylindrical structure, and the scheme that the anaerobic zone 2 and the anoxic zone 3 are wrapped outside the aerobic zone 1 may simplify the overall structure, reduce the occupied area, and facilitate the arrangement.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A parallel AAO-MBR reactor is characterized by comprising an aerobic zone (1), an anaerobic zone (2), an anoxic zone (3) and a mud-water separator (4), wherein the anaerobic zone (2) and the anoxic zone (3) are respectively provided with a sewage inlet (7), an MBR membrane component (5) is arranged in the aerobic zone (1), and a microporous aeration device (82) is arranged at the bottom in the aerobic zone (1);

an outlet (21) of the anaerobic zone and an outlet (31) of the anoxic zone are respectively communicated with the aerobic zone (1);

the anaerobic tank is characterized by further comprising a reflux pump (6) for pumping the mixed liquid in the aerobic zone (1) into the mud-water separator (4), wherein a mud outlet (41) of the mud-water separator (4) is communicated with the anaerobic zone (2), and a water outlet (42) of the mud-water separator (4) is communicated with the anoxic zone (3).

2. A parallel AAO-MBR reactor according to claim 1, characterized in that the bottom in the anaerobic zone (2) and the anoxic zone (3) are provided with a perforated aeration device (83), respectively.

3. A parallel AAO-MBR reactor according to claim 1, characterized in that suspended packing is provided in the aerobic zone (1) and the anoxic zone (3), respectively.

4. A parallel AAO-MBR reactor according to claim 1, wherein the sludge-water separator (4) comprises an inclined plate separation zone (43), a sump zone (44), and a hopper (45), the inclined plate separation zone (43) being circumferentially arranged outside the sump zone (44), the hopper (45) being provided below the inclined plate separation zone (43);

after the mixed liquor is separated by the inclined plate separation zone (43), the sludge can fall to the mud bucket (45), and the sewage can move upwards and overflow into the water collection zone (44);

the bottom outlet of the water collecting area (44) forms a water outlet (42) of the mud-water separator (4), and the bottom outlet of the mud bucket (45) forms a mud outlet (41) of the mud-water separator (4).

5. A parallel AAO-MBR reactor according to claim 4, wherein the sludge-water separator (4) further comprises a cyclone separation zone (46) arranged outside the inclined plate separation zone (43), wherein the bottom of the cyclone separation zone (46) is communicated with the bottom of the inclined plate separation zone (43);

the reflux pump (6) can pump the mixed liquid in the aerobic zone (1) into the cyclone separation zone (46) along the tangential direction.

6. A parallel AAO-MBR reactor according to claim 4, wherein the sludge-water separator (4) further comprises an overflow launder (47) circumferentially arranged along the top end of the catchment area (44), the overflow launder (47) having an outer edge height higher than an inner edge height of the overflow launder (47).

7. A parallel AAO-MBR reactor according to claim 4, further comprising a sludge supply pipe (48) communicating between the hopper (45) and the water outlet (42), wherein the end of the sludge supply pipe (48) facing the hopper (45) is higher than the end facing the water outlet (42).

8. A parallel AAO-MBR reactor according to claim 4, wherein the sludge-water separator (4) is located above the aerobic zone (1), the aerobic zone (1) is of a cylindrical structure, the anaerobic zone (2) and the anoxic zone (3) are located outside the cylindrical structure and enclose to form a cylindrical cavity wrapped outside the aerobic zone (1).