CN112573765B

CN112573765B - Continuous alternating MBBR sewage treatment device

Info

Publication number: CN112573765B
Application number: CN202011351018.8A
Authority: CN
Inventors: 郭丽丽
Original assignee: Hunan Xinyuan Environmental Technology Co ltd
Current assignee: Hunan Xinyuan Environmental Technology Co ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2022-08-16
Anticipated expiration: 2040-11-26
Also published as: CN112573765A

Abstract

The invention discloses continuous alternating MBBR sewage treatment equipment which is provided with a water inlet tank, a first-stage aerobic MBBR tank, a second-stage anoxic MBBR tank, a second-stage aerobic MBBR tank, a first-stage anoxic MBBR tank, a sludge treatment tank and a clean water tank, wherein the multi-stage aerobic MBBR tank and the anoxic MBBR tank can be used for treatment, and the multi-stage treatment ensures that the water quality purification effect reaches high quality; aerobic reaction and anoxic reaction are alternately carried out, and the pollutants in the sewage can be treated by the method.

Description

Continuous alternating MBBR sewage treatment device

Technical Field

The invention relates to the technical field of water treatment, in particular to continuous alternating type MBBR sewage treatment equipment.

Background

Moving-Bed Biofilm Reactor (MBBR) is another new type of Biofilm Reactor which has recently been regarded by researchers and developed for solving the complex operations of regular back flushing of a fixed Bed Reactor, fluidization of a fluidized Bed, blockage of a submerged biofilter, cleaning of filter materials and replacement of an aerator. The existing MBBR sewage treatment equipment has low treatment efficiency and poor treatment effect, and can not carry out multistage careful treatment on sewage.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides continuous alternating type MBBR sewage treatment equipment which can continuously and alternately treat pollutants in sewage and can carry out aerobic and anoxic treatment in stages.

A rolled MBBR according to an embodiment of the present invention includes: the system comprises a water inlet pool, a primary aerobic MBBR pool, a secondary anoxic MBBR pool, a secondary aerobic MBBR pool, a primary anoxic MBBR pool, a sludge treatment pool and a clean water pool which are sequentially arranged from left to right, wherein MBBR biological carriers are arranged in the primary aerobic MBBR pool, the secondary anoxic MBBR pool, the secondary aerobic MBBR pool and the primary anoxic MBBR pool;

the water inlet pool is provided with a water inlet pipeline, the bottom of the water inlet pool is provided with a first water pump, the first water pump is connected with a water distribution pipe, and two water outlets of the water distribution pipe are respectively connected to the insides of the first-stage aerobic MBBR pool and the first-stage anoxic MBBR pool;

a second water suction pump is arranged at the bottom of the primary aerobic MBBR tank and connected with a first water pipe, the water outlet end of the first water pipe is arranged inside the secondary anoxic MBBR tank, a first sludge pumping device is arranged at the bottom of the primary aerobic MBBR tank and connected with a sludge pipeline, the sludge outlet end of the sludge pipeline is arranged inside the sludge treatment tank, and a first aeration pipe is laid at the bottom of the primary aerobic MBBR tank;

a third water pump is arranged at the bottom of the primary anoxic MBBR tank and connected with a second water pipe, a water outlet end of the second water pipe is arranged inside the secondary aerobic MBBR tank, and a second sludge pumping device is arranged at the bottom of the primary anoxic MBBR tank and connected with the sludge pipeline;

a communicating pipe is arranged in the secondary anoxic MBBR tank and communicates the tank water of the secondary anoxic MBBR tank with the tank water of the secondary aerobic MBBR tank;

a fourth water suction pump is arranged at the bottom of the second-stage aerobic MBBR tank and connected with a third water pipe, the water outlet end of the third water pipe is arranged inside the second-stage anoxic MBBR tank, a water outlet pipe is arranged in the second-stage aerobic MBBR tank, the water outlet end of the water outlet pipe is arranged inside the clean water tank, a first self-priming pump is arranged in the middle section of the water outlet pipe, and a second aeration pipe is arranged at the bottom of the second-stage aerobic MBBR tank;

a water return pipe is arranged in the sludge treatment pool, the water outlet end of the water return pipe is arranged in the water inlet pool, a second self-priming pump is arranged at the middle section of the water return pipe, a sludge discharge pipe is further arranged at the bottom of the sludge treatment pool, and the other end of the sludge discharge pipe is connected with a sludge discharge pump;

the clean water basin is provided with a water delivery pipe, and the other end of the water delivery pipe is provided with a valve and a third self-sucking pump.

The continuous alternating type MBBR sewage treatment equipment provided by the embodiment of the invention at least has the following technical effects: can carry out multi-stage aerobic and anoxic MBBR tank treatment, and the multi-stage treatment ensures that the water quality purification effect reaches high quality; aerobic reaction and anoxic reaction are alternately carried out, and the pollutants in the sewage can be treated by the method.

In some embodiments of the present invention, the MBBR bio-carrier comprises a rolled substrate, a binding device and an impeller device, the rolled substrate is formed by rolling an outer-to-inner bio-carrier and an interlayer filler, and the bio-carrier is provided with a plurality of through holes; the binding device is fixed along the circumferential direction of the rolled base body so as to bind the rolled base body; the impeller devices are arranged at two ends of the roll type base body and fixedly connected with the roll type base body to drive the roll type base body to rotate.

In some embodiments of the present invention, the impeller device includes a fixed disk and a plurality of blades, the fixed disk is annular, and the blades are uniformly arranged around an axis of the fixed disk and fixedly connected to the fixed disk.

In some embodiments of the present invention, an air-equalizing plate is disposed above each of the first aeration pipe and the second aeration pipe, and the air-equalizing plate is close to the bottom of the tank and is fixedly connected to a sidewall of the tank.

In some embodiments of the present invention, a mechanical stirring device is disposed inside the primary or secondary oxygen-deficient MBBR tank, the mechanical stirring device includes a fixed beam, a motor and a stirring arm, the fixed beam spans across the tank, the fixed beam is fixedly connected to a side wall inside the tank, the motor is mounted at a central point of the fixed beam, the stirring arm is connected to the motor, the motor rotates to drive the stirring arm to rotate and stir, and the stirring arm extends into water inside the tank.

In some embodiments of the invention, one end of the water outlet pipe in the secondary aerobic MBBR tank is provided with a first filtering device, and one end of the water return pipe in the sludge treatment tank is provided with a second filtering device.

In some embodiments of the present invention, the first water pump, the second water pump, the third water pump and the fourth water pump are all installed with a screen device.

In some embodiments of the present invention, the water outlet end pipelines of the first self-priming pump, the second self-priming pump and the third self-priming pump are all provided with a water pressure gauge.

In some embodiments of the invention, the two water outlets of the water distribution pipe are respectively provided with the valve.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural diagram of a continuous alternate MBBR sewage treatment plant according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the structure of an MBBR bio-carrier according to an embodiment of the present invention;

FIG. 3 is a partially enlarged schematic view of a gas distribution plate according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of an enlarged structure of a first-stage anoxic MBBR tank in the embodiment of the present invention.

Reference numerals:

a water inlet tank 100, a water inlet pipe 110;

the system comprises a primary aerobic MBBR tank 200, a first aeration pipe 211, a second aeration pipe 212 and an air-homogenizing plate 220;

a secondary anoxic MBBR tank 300, a communicating pipe 310, a screen blocking device 320 and a mechanical stirring device 330;

a secondary aerobic MBBR tank 400, a water outlet pipe 410, a first filtering device 421 and a second filtering device 422;

a first-level anoxic MBBR tank 500;

a sludge treatment tank 600, a water return pipe 610, a sludge discharge pipe 620 and a sludge discharge pump 630;

a clean water tank 700 and a water delivery pipe 710;

a first water pump 810, a water distribution pipe 811, a second water pump 820, a first water pipe 821, a third water pump 830, a second water pipe 831, a fourth water pump 840 and a third water pipe 841;

first self-primer pump 850, second self-primer pump 860, third self-primer pump 870;

a first sludge pumping device 910, a sludge pipeline 911 and a second sludge pumping device 920;

roll-up matrix 1100, bio-carrier 1110, interlayer filler 1120, restraint device 1200;

impeller device 1300, fixed disk 1310, vanes 1320.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1, a continuous alternating type MBBR sewage treatment plant according to an embodiment of the present invention includes: the system comprises a water inlet pool 100, a primary aerobic MBBR pool 200, a secondary anoxic MBBR pool 300, a secondary aerobic MBBR pool 400, a primary anoxic MBBR pool 500, a sludge treatment pool 600 and a clean water pool 700 which are arranged from left to right in sequence, wherein MBBR biological carriers are arranged in the primary aerobic MBBR pool 200, the secondary anoxic MBBR pool 300, the secondary aerobic MBBR pool 400 and the primary anoxic MBBR pool 500;

the water inlet tank 100 is provided with a water inlet pipeline 110, the bottom of the water inlet tank 100 is provided with a first water pump 810, the first water pump 810 is connected with a water distribution pipe 811, and two water outlets of the water distribution pipe 811 are respectively connected to the insides of the first-stage aerobic MBBR tank 200 and the first-stage anoxic MBBR tank 500;

a second water pump 820 is arranged at the bottom of the primary aerobic MBBR tank 200, the second water pump 820 is connected with a first water pipe 821, the water outlet end of the first water pipe 821 is arranged inside the secondary anoxic MBBR tank 300, a first sludge pumping device 910 is arranged at the bottom of the primary aerobic MBBR tank 200, the first sludge pumping device 910 is connected with a sludge pipeline 911, the sludge outlet end of the sludge pipeline 911 is arranged inside the sludge treatment tank 600, and a first aeration pipe 211 is laid at the bottom of the primary aerobic MBBR tank 200;

a third water pump 830 is arranged at the bottom of the first-stage anoxic MBBR tank 500, the third water pump 830 is connected with a second water pipe 831, the water outlet end of the second water pipe 831 is arranged inside the second-stage aerobic MBBR tank 400, a second sludge pumping device 920 is arranged at the bottom of the first-stage anoxic MBBR tank 500, and the second sludge pumping device 920 is connected with a sludge pipeline 911;

a communicating pipe 310 is arranged in the secondary anoxic MBBR tank 300, and the communicating pipe 310 communicates the secondary anoxic MBBR tank 300 with the tank water of the secondary aerobic MBBR tank 400;

a fourth water suction pump 840 is arranged at the bottom of the second-stage aerobic MBBR tank 400, the fourth water suction pump 840 is connected with a third water pipe 841, the water outlet end of the third water pipe 841 is arranged inside the second-stage anoxic MBBR tank 300, a water outlet pipe 410 is arranged inside the second-stage aerobic MBBR tank 400, the water outlet end of the water outlet pipe 410 is arranged inside the clean water tank 700, a first self-priming pump 850 is arranged in the middle section of the water outlet pipe 410, and a second aeration pipe 212 is arranged at the bottom of the second-stage aerobic MBBR tank 400;

a water return pipe 610 is arranged in the sludge treatment pool 600, the water outlet end of the water return pipe 610 is arranged in the water inlet pool 100, a second self-priming pump 860 is arranged in the middle section of the water return pipe 610, a sludge discharge pipe 620 is further arranged at the bottom of the sludge treatment pool 600, and the other end of the sludge discharge pipe 620 is connected with a sludge discharge pump 630;

clean water basin 700 is equipped with raceway 710, and the raceway 710 other end is equipped with valve and third self priming pump 870.

When the embodiment of the invention is used, external sewage enters the water inlet tank 100 through the water inlet pipeline 110, the first water pump 810 at the bottom of the water inlet tank 100 pumps water, the sewage is conveyed to the first-stage aerobic MBBR tank 200 and the first-stage anoxic MBBR tank 500 through the water distribution pipe 811, and the water inlet tank 100 plays roles in storing sewage and distributing sewage to the treatment tank.

The sewage entering the primary treatment tank is subjected to primary aerobic and anoxic reactions respectively, a first aeration pipe 211 is laid at the bottom of the primary aerobic MBBR tank 200, a plurality of aeration holes are formed in the first aeration pipe 211, air is sent to the primary aerobic MBBR tank 200 through the first aeration pipe 211, MBBR biological carriers in the tank are pushed to float and move, and oxygen in the air is dissolved in the sewage to provide oxygen required by the aerobic reactions; in the first-stage anoxic MBBR tank 500, sewage and the MBBR biological carriers in the tank perform anoxic reaction. The bottom of the pool of one-level good oxygen MBBR pond 200 and one-level oxygen deficiency MBBR pond 500 is equipped with respectively that first take out mud device 910 and second and takes out mud device 920, and the MBBR biological carrier can generate more residue in the one-level good oxygen that goes on with sewage and one-level oxygen deficiency reaction, also takes solid-state suspended solid in the sewage itself, and these materials accumulate certain volume and can form mud, need in time clear up.

The sewage treated in the first-stage treatment tank can be conveyed to the next-stage treatment tank. The sewage treated by the first-stage aerobic MBBR tank 200 is sent to the second-stage anoxic MBBR tank 300 through a first water pipe 821 for alternate second-stage anoxic reaction treatment; the sewage treated by the first-stage anoxic MBBR tank 500 is sent to the second-stage aerobic MBBR tank 400 through a second water pipe 831 to carry out alternate second-stage aerobic reaction treatment. Through secondary treatment, pollutants in the sewage can be further refined and degraded, the treatment effect is improved, and through alternate treatment of aerobic reaction and anoxic reaction, pollutants in the sewage can be treated as much as possible.

Second grade oxygen deficiency MBBR pond 300 and second grade oxygen deficiency MBBR pond 400 are through communicating pipe 310 intercommunication, sewage in the second grade oxygen deficiency MBBR pond 300 is after carrying out the second grade oxygen deficiency reaction, can enter into second grade oxygen deficiency MBBR pond 400 through communicating pipe 310 and continue to carry out the second grade oxygen deficiency reaction, and the fourth suction pump 840 that is equipped with in the bottom of the pool in second grade oxygen MBBR pond 400 can pass through third water pipe 841 suction second grade oxygen deficiency MBBR pond 300 again with sewage, sewage can get into next oxygen deficiency reaction again after having carried out the second grade oxygen deficiency reaction, so relapse continuous alternating treatment sewage, can exert the maximum treatment effeciency of MBBR bio-carrier.

Be equipped with outlet pipe 410 in the good oxygen MBBR pond of second grade 400, the interlude of outlet pipe 410 is equipped with first self priming pump 850 and provides power, and sewage is carried to the clean water basin 700 through outlet pipe 410.

The sludge treatment tank 600 settles the sewage containing sludge conveyed by the sludge pipeline 911, the sewage containing sludge is layered in the sludge treatment tank 600, and the sludge is discharged from the sludge discharge pipe 620 through the sludge discharge pump 630 in the lower half part of the tank. The sewage after the sedimentation treatment is conveyed to the interior of the water inlet pool 100 through the second self-priming pump 860 through the water return pipe 610 at the upper half part in the pool, and the sewage MBBR process treatment is continuously carried out.

The clean water basin 700 serves to store the treated water, and the treated water can be transported to other places through the water transport pipe 710, a valve on the pipeline can control the opening and closing of the water transport pipe 710 so as to facilitate the pipeline maintenance, and the third self-sucking pump 870 provides water transport power.

Referring to fig. 2, in some embodiments of the present invention, the MBBR bio-carrier includes a rolled substrate 1100, a binding device 1200 and an impeller device 1300, the rolled substrate 1100 is formed by rolling a bio-carrier 1110 and an interlayer filler 1120 from outside to inside, and the bio-carrier 1110 is provided with a plurality of through holes; the binding device 1200 is fixed along the circumferential direction of the rolled substrate 1100 to bind the rolled substrate 1100; both ends of the roll type base 1100 are provided with impeller devices 1300, and the impeller devices 1300 are fixedly connected with the roll type base 1100 to drive the roll type base 1100 to rotate.

Roll up formula base member 1100 and roll up the system by biological carrier 1110 and interlaminar filler 1120 and form, this structure has high specific surface area, microorganism attachment space has been increased, roll up formula base member 1100 both ends face and be equipped with impeller device 1300, it receives rivers effect to drive roll up formula base member 1100 rotatory showy removal in the lump, thereby it is wider to distribute in the sewage treatment pond, a plurality of perforating hole has been seted up on biological carrier 1110 surface, sewage flows inside the carrier easily, the biomembrane on the biological carrier 1110 is changeed and is contacted with the pollutant, the degradation efficiency of biomembrane to pollutant in the sewage has been improved.

In some embodiments of the present invention, the impeller device 1300 includes a fixed disk 1310 and a plurality of vanes 1320, the fixed disk 1310 is in a circular ring shape, and the vanes 1320 are uniformly arranged around an axis of the fixed disk 1310 and are fixedly connected with the fixed disk 1310. Impeller device 1300 includes fixed disk 1310 and a plurality of blade 1320, and fixed disk 1310 is the ring form, can fixed mounting on the terminal surface of rolling up formula base member 1100, and blade 1320 around the even arrangement of the axis of fixed disk 1310, and with fixed disk 1310 fixed connection, roll up formula base member 1100 and move along with rivers, can fully mix with the pollutant in the sewage, be favorable to the degradation of pollutant.

Referring to fig. 1 and 3, in some embodiments of the present invention, an air-equalizing plate 220 is disposed above the aeration pipes 210 of the primary aerobic MBBR tank 200 and the secondary aerobic MBBR tank 400, and the air-equalizing plate 220 is close to the bottom of the tank and is fixedly connected to the side wall of the tank.

Gas distribution plate 220 can make aeration pipe 210 when aerating evenly distributed the air to whole pond in for sewage homoenergetic everywhere in the aerobic tank effectively carries out aerobic reaction with the MBBR biological carrier.

Referring to fig. 1 and 4, in some embodiments of the present invention, a mechanical stirring device 330 is disposed inside the first-stage oxygen-deficient MBBR tank 500 or the second-stage oxygen-deficient MBBR tank 300, the mechanical stirring device 330 includes a fixed beam, a motor and a stirring arm, the fixed beam spans across the tank, the fixed beam is fixedly connected to a side wall of the tank, the motor is mounted at a central point of the fixed beam, the motor is connected to the stirring arm, the motor rotates to drive the stirring arm to rotate and stir, and the stirring arm extends into water in the tank.

Through setting up mechanical stirring device 330, can make the MBBR biological carrier in the oxygen deficiency MBBR pond more even with sewage mixing, the MBBR biological carrier floats under mechanical stirring device 330's stirring effect and removes, improves reaction efficiency, and the fixed beam spanes at the pond in order fixed motor, and the motor rotation drives its stirring arm of connecting and rotates stirring pond water, and the flow of pond water has driven the removal of MBBR biological carrier.

In some embodiments of the present invention, the water outlet pipe 410 is provided with a first filtering device 421 at one end in the secondary aerobic MBBR tank 400, and the water return pipe 610 is provided with a second filtering device 422 at one end in the sludge treatment tank 600. Outlet pipe 410 is equipped with first filter equipment 421 in the one end in the pond, and the filtration of sewage after the processing through first filter equipment 421 can effectively filter the solid-state suspended solid in the aquatic, guarantees to carry the quality of water to clean water basin 700 clear, and wet return 610 is equipped with second filter equipment 422 in the one end in sludge treatment pond 600, guarantees that the sewage that flows back to intake pond 100 does not have silt.

In some embodiments of the present invention, the first water pump 810, the second water pump 820, the third water pump 830 and the fourth water pump 840 are all installed with the blocking net device 320, so that damage caused by the suction of the damaged MBBR bio-carrier in the water pumps can be avoided.

In some embodiments of the present invention, the water pressure gauges are attached to the outlet end tubing of first self-primer pump 850, second self-primer pump 860, and third self-primer pump 870. The water pressure gauge can monitor the working condition of the self-priming pump in real time and remind people of abnormal conditions.

In some embodiments of the present invention, two outlets of the water diversion pipe 810 are respectively provided with a valve. Valves are respectively arranged at two water outlets of the water diversion pipe 810, and the water inflow of the first-level aerobic MBBR tank 200 and the first-level anoxic MBBR tank 500 can be respectively controlled according to the sewage amount to be treated.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A continuous alternating MBBR sewage treatment plant, comprising:

the system comprises a water inlet tank (100), a primary aerobic MBBR tank (200), a secondary anoxic MBBR tank (300), a secondary aerobic MBBR tank (400), a primary anoxic MBBR tank (500), a sludge treatment tank (600) and a clean water tank (700) which are sequentially arranged from left to right, wherein MBBR biological carriers are arranged in the primary aerobic MBBR tank (200), the secondary anoxic MBBR tank (300), the secondary aerobic MBBR tank (400) and the primary anoxic MBBR tank (500);

the water inlet tank (100) is provided with a water inlet pipeline (110), the bottom of the water inlet tank (100) is provided with a first water pump (810), the first water pump (810) is connected with a water distribution pipe (811), and two water outlets of the water distribution pipe (811) are respectively connected to the insides of the first-stage aerobic MBBR tank (200) and the first-stage anoxic MBBR tank (500);

a second water suction pump (820) is arranged at the bottom of the primary aerobic MBBR tank (200), the second water suction pump (820) is connected with a first water pipe (821), the water outlet end of the first water pipe (821) is arranged inside the secondary anoxic MBBR tank (300), a first sludge pumping device (910) is arranged at the bottom of the primary aerobic MBBR tank (200), the first sludge pumping device (910) is connected with a sludge pipeline (911), the sludge outlet end of the sludge pipeline (911) is arranged inside the sludge treatment tank (600), and a first aeration pipe (211) is laid at the bottom of the primary aerobic MBBR tank (200);

a third water pump (830) is arranged at the bottom of the primary anoxic MBBR tank (500), the third water pump (830) is connected with a second water pipe (831), the water outlet end of the second water pipe (831) is arranged inside the secondary aerobic MBBR tank (400), a second sludge pumping device (920) is arranged at the bottom of the primary anoxic MBBR tank (500), and the second sludge pumping device (920) is connected with the sludge pipeline (911);

a communicating pipe (310) is arranged in the secondary anoxic MBBR tank (300), and the communicating pipe (310) communicates the secondary anoxic MBBR tank (300) with the tank water of the secondary aerobic MBBR tank (400);

a fourth water suction pump (840) is arranged at the bottom of the second-stage aerobic MBBR tank (400), the fourth water suction pump (840) is connected with a third water pipe (841), the water outlet end of the third water pipe (841) is arranged inside the second-stage anoxic MBBR tank (300), a water outlet pipe (410) is arranged inside the second-stage aerobic MBBR tank (400), the water outlet end of the water outlet pipe (410) is arranged inside the clean water tank (700), a first self-priming pump (850) is arranged in the middle section of the water outlet pipe (410), and a second aeration pipe (212) is arranged at the bottom of the second-stage aerobic MBBR tank (400);

a water return pipe (610) is arranged in the sludge treatment pool (600), the water outlet end of the water return pipe (610) is arranged in the water inlet pool (100), a second self-sucking pump (860) is arranged in the middle section of the water return pipe (610), a sludge discharge pipe (620) is further arranged at the bottom of the sludge treatment pool (600), and the other end of the sludge discharge pipe (620) is connected with a sludge discharge pump (630);

clean water basin (700) are equipped with raceway (710), the raceway (710) other end is equipped with valve and third self priming pump (870).

2. The continuous alternating type MBBR sewage treatment equipment according to claim 1, wherein the MBBR bio-carrier comprises a roll-type matrix (1100), a binding device (1200) and an impeller device (1300), the roll-type matrix (1100) is formed by rolling an outer-to-inner bio-carrier (1110) and an interlayer filler (1120), and the bio-carrier (1110) is provided with a plurality of through holes; the binding device (1200) is fixed along the circumferential direction of the rolled base (1100) to bind the rolled base (1100); the impeller devices (1300) are arranged at two ends of the roll-type base body (1100), and the impeller devices (1300) are fixedly connected with the roll-type base body (1100) to drive the roll-type base body (1100) to rotate.

3. The continuous alternating MBBR sewage treatment plant according to claim 2, wherein said impeller device (1300) comprises a fixed disk (1310) and a plurality of vanes (1320), said fixed disk (1310) is in a ring shape, said vanes (1320) are uniformly arranged around the axis of said fixed disk (1310) and are fixedly connected with said fixed disk (1310).

4. The continuous alternating MBBR sewage treatment plant according to claim 1, wherein a gas homogenizing plate (220) is arranged above each of the first aeration pipe (211) and the second aeration pipe (212), and the gas homogenizing plate (220) is close to the bottom of the tank and is fixedly connected with the side wall in the tank.

5. The continuous alternating type MBBR sewage treatment device according to claim 1, wherein a mechanical stirring device (330) is arranged inside the primary anoxic MBBR tank (500) or the secondary anoxic MBBR tank (300), the mechanical stirring device (330) comprises a fixed beam, a motor and a stirring arm, the fixed beam, the motor and the stirring arm span the tank, the fixed beam is fixedly connected with the side wall inside the tank, the motor is installed at the central point of the fixed beam, the stirring arm is connected to the motor, the motor rotates to drive the stirring arm to stir in a rotating manner, and the stirring arm extends into the water inside the tank.

6. The continuous alternating MBBR sewage treatment plant according to claim 1, wherein one end of the water outlet pipe (410) in the secondary aerobic MBBR tank (400) is provided with a first filtering device (421), and one end of the water return pipe (610) in the sludge treatment tank (600) is provided with a second filtering device (422).

7. A continuous alternating MBBR sewage treatment plant according to any of the claims 1 to 6, wherein said first (810), second (820), third (830) and fourth (840) suction pumps are all equipped with screen devices (320).

8. A continuous and alternative MBBR sewage treatment plant according to any of claims 1 to 6, wherein said first self-priming pump (850), second self-priming pump (860) and third self-priming pump (870) are equipped with water pressure gauge on their water outlet pipes.

9. A continuous alternating MBBR sewage treatment plant according to any of the claims 1 to 6, wherein the two water outlets of said water knockout pipe (811) are provided with valves respectively.