CN212269586U - Synchronous nitrification and denitrification MBBR sewage treatment equipment - Google Patents
Synchronous nitrification and denitrification MBBR sewage treatment equipment Download PDFInfo
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- CN212269586U CN212269586U CN202020126604.1U CN202020126604U CN212269586U CN 212269586 U CN212269586 U CN 212269586U CN 202020126604 U CN202020126604 U CN 202020126604U CN 212269586 U CN212269586 U CN 212269586U
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Abstract
The embodiment of the utility model discloses synchronous nitrification and denitrification MBBR sewage treatment device relates to the environmental protection field, include: the system comprises an anoxic tank, an aerobic tank, a sedimentation tank and a biological filter tank, wherein a liquid inlet of the aerobic tank is communicated with a liquid outlet of the anoxic tank, a liquid return port of the aerobic tank is communicated with the anoxic tank, and a liquid inlet of the sedimentation tank is communicated with a liquid outlet of the aerobic tank; the liquid inlet of the biological filter is communicated with the liquid outlet of the sedimentation tank. The sewage treatment equipment has high treatment load and small volume of the biological filter, and can reduce the capital investment; because the carriers are added in the anoxic tank and the aerobic tank, microorganisms in the tanks are mainly on a biological membrane, and a sludge return mode is not needed, so that the total amount of the microorganisms in the biochemical tanks is kept, the equipment investment is reduced, the operation is simpler and more convenient, and the operation cost of sewage is reduced; the biological filter can reduce the impact of the fluctuation of natural conditions such as water quality, water quantity, temperature and the like on the system, can effectively ensure the effluent quality of a process system, and ensures that the system is discharged after reaching the standard.
Description
Technical Field
The embodiment of the utility model provides a relate to the environmental protection field, concretely relates to synchronous nitrification and denitrification MBBR sewage treatment device.
Background
With the development of economy, the country pays more and more attention to the problem of environmental protection, and at the present stage, the country requires to improve the sewage standard of a sewage treatment plant. Many sewage plants operate for the majority of the time to meet new emission standards: occasionally, one of COD, ammonia nitrogen and total nitrogen exceeds the standard or a plurality of indexes exceed the standard simultaneously, wherein the phenomenon that the total nitrogen exceeds the standard is serious. Many sewage treatment plants have laggard secondary sewage treatment processes due to long plant building time, low volume load, high operation cost, low treatment efficiency, large occupied area and overproof total nitrogen emission.
SUMMERY OF THE UTILITY MODEL
Therefore, the embodiment of the utility model provides a synchronous nitrification and denitrification MBBR sewage treatment device to there is the volume load low in solving current sewage treatment technique, and the running cost is high, and the treatment effeciency is low, and area is big, and the problem that total nitrogen emission exceeds standard.
In order to realize the above purpose, the embodiment of the utility model provides a denitrification in step MBBR sewage treatment device, denitrification in step MBBR sewage treatment device includes:
an anoxic tank for converting insoluble organic matter to soluble organic matter, hydrolyzing suspended contaminants and soluble organic matter, and converting NO to3 -Reducing the nitrogen into molecular nitrogen;
the liquid inlet of the aerobic tank is communicated with the liquid outlet of the anoxic tank, the liquid return port of the aerobic tank is communicated with the anoxic tank, and the aerobic tank is used for ammoniating protein and fat in anoxic hydrolysate to free NH3And NH4 +And NH is reacted with3And NH4 +Oxidation to NO3 -；
A liquid inlet of the sedimentation tank is communicated with a liquid outlet of the aerobic tank;
and the liquid inlet of the biological filter is communicated with the liquid outlet of the sedimentation tank, and the biological filter is used for performing nitrification and denitrification on the settled sewage.
Further, the oxygen-poor pool comprises an oxygen-poor pool body and a plurality of groups of biological carrier compression devices arranged in the oxygen-poor pool body, and an aeration device is arranged at the bottom of the oxygen-poor pool body.
Furthermore, a suspended biological carrier is placed in the aerobic tank, and an aeration device is arranged at the bottom of the aerobic tank.
Furthermore, the biological filter comprises a biological filter body, a plurality of groups of biological carrier compression devices and an aeration device arranged at the bottom of the biological filter body.
Further, the biological carrier compression device comprises a frame, a driving device, a fixed baffle, a movable baffle, a plurality of lifting shafts, a plurality of fixed shafts and a plurality of porous massive biological carriers; the fixed baffle is arranged below the movable baffle and is connected with the frame; the fixed shaft and the lifting shaft are arranged at intervals, the lower end of the fixed shaft is connected with the fixed baffle, the upper end of the fixed shaft penetrates through the movable baffle and then is connected with the frame, the lower end of the lifting shaft penetrates through the fixed baffle, the upper end of the lifting shaft penetrates through the movable baffle and then is connected with the driving device, the porous massive biological carriers are sleeved on the fixed shaft and the lifting shaft in a one-to-one correspondence mode, the porous massive biological carriers are located between the fixed baffle and the movable baffle, and the driving device drives the movable baffle to move up and down through the lifting shaft.
Furthermore, the material of the porous massive biological carrier is a polymer composite material.
Further, the driving device is a speed reducing motor, and a rotating shaft of the speed reducing motor is connected with the upper end of the lifting shaft.
Further, the length of the porous block-shaped biological carrier is 100mm, the height is 100mm, and the width is 50 mm.
Correspondingly, the utility model also provides a synchronous nitrification and denitrification MBBR sewage treatment method, the synchronous nitrification and denitrification MBBR sewage treatment method includes following steps:
step a, converting insoluble organic matters into soluble organic matters by using an anoxic pond, and hydrolyzing suspended pollutants and soluble organic matters;
b, ammoniating protein and fat in the anoxic hydrolysate by using an aerobic tank to free NH3And NH4 +And NH is reacted with3And NH4 +Oxidation to NO3 -；
C, settling the sewage after the aerobic treatment by using a settling tank;
and d, performing nitrification and denitrification on the precipitated sewage by using the biological filter to remove residual organic matters and nitrogen.
Further, the following steps are also executed while the step b is executed: the sewage after the aerobic treatment flows back to the anoxic tank, and NO in the sewage after the aerobic treatment is treated by denitrification3 -Reducing into molecular nitrogen.
The embodiment of the utility model provides a have following advantage:
1. the utility model discloses synchronous nitrification and denitrification MBBR sewage treatment device handles the load height, and the biological filter volume is little, can reduce the capital construction investment.
2. The utility model discloses because there is throwing of carrier to throw in synchronous nitrification and denitrification MBBR sewage treatment device's oxygen deficiency pond, the aerobic tank, the microorganism uses on the biomembrane in the pond to be main, so need not adopt the mode of backward flow mud, keeps the total amount of microorganism in the biochemical pond, and the cancellation of backward flow mud has reduced the equipment investment, makes the operation more simple and convenient, has reduced the running cost of sewage.
3. The utility model discloses denitrification MBBR sewage treatment plant's in step nitrifies mud productivity is low, has reduced the sludge treatment expense.
4. The utility model discloses synchronous nitrification and denitrification MBBR sewage treatment device can effectively guarantee the play water quality of process system through the undulant impact to the system of natural conditions such as biological filter reducible quality of water, water yield and temperature, ensures that the system is discharge to reach standard.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.
FIG. 1 is a schematic structural diagram of a synchronous nitrification and denitrification MBBR sewage treatment device provided by the embodiment of the utility model;
FIG. 2 is a schematic side view, sectional structure of a biofilter according to an embodiment of the present invention;
FIG. 3 is a flow chart of a synchronous nitrification and denitrification MBBR sewage treatment method provided by the embodiment of the utility model.
Description of reference numerals: 10. a biological filter pool body; 20. a frame; 30. a bio-carrier compression device; 31. fixing a baffle plate; 32. a movable flapper; 33. a lifting shaft; 34. a fixed shaft; 35. a porous bulk biological carrier; 40. a reduction motor; 50. an aeration device; 60. an anoxic tank; 70. an aerobic tank; 71. suspending a biological carrier; 72. a liquid return port; 80. a sedimentation tank; 90. a biological filter.
Detailed Description
The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, the synchronous nitrification and denitrification MBBR sewage treatment equipment comprises an anoxic tank 60, an aerobic tank 70, a sedimentation tank 80 and a biological filter 90, and the synchronous nitrification and denitrification MBBR sewage treatment equipment can give full play to the advantages of the MBBR process and the biological filter 90 process in removing organic pollutants, nitrogen and phosphorus, and is suitable for upgrading and expanding of integrated devices, newly-built sewage plants and existing sewage plants.
The anoxic tank 60 is used to convert insoluble organic matter to soluble organic matter, hydrolyze suspended contaminants and soluble organic matter, and convert NO to3 -Reducing into molecular nitrogen. The anoxic tank 60 comprises an anoxic tank body and a plurality of groups of biological carrier compression devices 30 arranged in the anoxic tank body, and the bottom of the anoxic tank body is provided with an aeration device 50.
As shown in fig. 2, the anoxic tank 60 in this embodiment includes three sets of biological carrier compressing devices 30, and the three sets of biological carrier compressing devices 30 share one driving device, however, the number of the biological carrier compressing devices 30 and the driving devices is not limited thereto, and the optimization design is specifically performed according to the size of the designed anoxic tank body and the effective water depth in normal operation. The biological carrier compressing device 30 comprises a frame 20, a driving device, a fixed baffle 31, a movable baffle 32, a plurality of lifting shafts 33, a plurality of fixed shafts 34 and a plurality of porous block-shaped biological carriers 35; the frame 20 is arranged in the anoxic tank body, and the frame 20 is used for providing an installation foundation for the biological carrier compression device 30. The fixed baffle 31 is horizontally arranged below the movable baffle 32 and is connected with the frame 20; the fixed shaft 34 and the lifting shaft 33 are arranged in parallel and at intervals, the lifting shaft 33 and the fixed shaft 34 are arranged in three rows and multiple columns, wherein the first row and the third row are the fixed shaft 34, the middle second row is the lifting shaft 33, the lower end of the fixed shaft 34 is connected with the fixed baffle 31, the upper end of the fixed shaft 34 passes through the movable baffle 32 and then is connected with the frame 20, the lower end of the lifting shaft 33 passes through the fixed baffle 31 or is in rotating fit with the fixed baffle 31, the upper end of the lifting shaft 33 passes through the movable baffle 32 and then is connected with the driving device, the driving device drives the movable baffle 32 to move up and down through the lifting shaft 33, the lifting shaft 33 in the embodiment is specifically a lead screw, the driving device is a speed reducing motor 40, the rotating shaft of the speed reducing motor 40 is connected with the upper end of the lead screw through a coupler and a gear set, the lead screw, other devices having the same function may also be used. The movable flap 32 moves up and down when the reduction motor 40 rotates, the porous bulk bio-carrier 35 is compressed when the movable flap 32 moves down, and the porous bulk bio-carrier 35 is extended when the movable flap 32 moves up.
The plurality of porous block-shaped biological carriers 35 are sleeved on the fixed shaft 34 and the lifting shaft 33 in a one-to-one correspondence manner, the porous block-shaped biological carriers 35 are positioned between the fixed baffle plate 31 and the movable baffle plate 32, the porous block-shaped biological carriers 35 are made of polymer composite materials, and the sponge-shaped biological carriers made of the materials have the advantages of high porosity, large specific surface area, good air permeability, good water permeability, strong elasticity, aging resistance and good hydrophilic performance. Compared with the common suspended filler, the biomass of the porous massive biological carriers 35 is greatly increased, so that the pollutant removal efficiency is increased, and the generation amount of residual sludge is reduced. In this embodiment, the length of the porous block-shaped biological carrier 35 is 100mm, the height thereof is 100mm, the width thereof is 50mm, and the distance between two adjacent porous block-shaped biological carriers 35 is 50-100mm, although the size of the porous block-shaped biological carrier 35 is not limited thereto, and the optimal design is specifically performed according to the size of the designed anoxic tank body and the effective water depth during normal operation.
The aerobic tank 70 is used for ammoniating protein and fat in the anoxic sewage to free NH3And NH4 +And NH is reacted with3And NH4 +Oxidation to NO3 -. The liquid inlet of the aerobic tank 70 is communicated with the liquid outlet of the anoxic tank 60, the liquid return port 72 of the aerobic tank 70 is communicated with the anoxic tank 60, the suspended organism carrier 71 is placed in the aerobic tank 70, and the bottom of the aerobic tank 70 is provided with the aeration device 50. The size of the suspended biological carrier 71 is 20X 20mm or 10X 10mm, and the adding amount can be 10-60% of the effective volume of the aerobic tank 70. Suspended organism carrierMicroorganisms are attached to the body 71, the suspended organism carrier 71 is used as a carrier for the attachment and growth of the microorganisms, and as the biomembrane on the suspended organism carrier 71 is not limited by the sludge age of discharged sludge, more sludge-aged flora, especially nitrifying bacteria, can be enriched, a high-efficiency ammonia nitrogen nitrification effect is obtained, the load is high, and the ammonia nitrogen concentration of discharged water is low. But also has the advantages of small occupied space, low capital construction cost, flexible and simple transformation and construction, and the like.
The sedimentation tank 80 is used for settling the sewage after the aerobic treatment, so that the sludge is separated from the sewage after the aerobic treatment, a liquid inlet of the sedimentation tank 80 is communicated with a liquid outlet of the aerobic tank 70, and a sludge discharge port is arranged at the bottom of the sedimentation tank 80.
The biological filter 90 is used for performing nitrification and denitrification on the settled sewage, a liquid inlet of the biological filter 90 is communicated with a liquid outlet of the settling tank 80, and the biological filter 90 comprises a biological filter body 10, a plurality of groups of biological carrier compression devices 30 and an aeration device 50 arranged at the bottom of the biological filter body 10; one end of the biological filter tank body 10 is provided with a water inlet, the other end is provided with a water outlet, the aeration device 50 is used for increasing the oxygen content in the biological filter tank body 10, and meanwhile, the aeration device 50 also has a certain stirring effect on the sewage of the biological filter tank body 10. As shown in fig. 2, the biofilter 90 in this embodiment includes eight groups of bio-carrier compression devices 30 and four driving devices, the eight groups of bio-carrier compression devices 30 are sequentially arranged along the length direction of the biofilter body 10, and each two groups of bio-carrier compression devices 30 share one driving device. Of course, the number of the bio-carrier compressing devices 30 and the driving devices is not limited to this, and the design is optimized according to the size of the designed bio-filter tank body 10 and the effective water depth during normal operation. Since the structure of the bio-carrier compressing apparatus 30 of the bio-filter 90 is the same as that of the bio-carrier compressing apparatus 30 of the anoxic tank 60, it will not be described in detail.
Because the porous massive biological carrier 35 has a plurality of pores therein, a biofilm is formed in the pores of the porous massive biological carrier 35, and the biofilm sequentially grows aerobic microorganisms, anoxic microorganisms and anaerobic microorganisms from the outer layer to the inner layer. It is equivalent to simultaneously carry out aerobic, anoxic and anaerobic biological treatment on water on a porous block-shaped biological carrier 35. The adoption of the porous massive biological carrier 35 also creates conditions for the nitrifying bacteria and the denitrifying bacteria with long growth period and higher microorganisms to be gathered and live in the biochemical pond. The higher total biological quantity and the complete microbial food chain can reduce the discharge of sludge while ensuring that the organic pollutants, nitrogen and phosphorus elements in the water are fully degraded and converted. The synchronous nitrification and denitrification biological filter 90 of the embodiment of the utility model can reduce the volume of the reactor by about 30 to 40 percent because the nitrification and denitrification reactions are synchronously carried out in the same reactor; OH-generated by denitrification can neutralize H + generated by nitrification in situ, and the PH in the reactor can be effectively maintained.
Due to the large size of the porous bulk biological carrier 35, dissolved oxygen in the wastewater hardly reaches the interior of the porous bulk biological carrier 35, and a large anoxic and anaerobic region can be formed inside the porous bulk biological carrier 35. Therefore, the internal area biological membrane mainly takes anoxic and anaerobic microorganisms to carry out denitrification reaction on nitrogen in the sewage and simultaneously degrade partial organic matters in the sewage in an anoxic environment. The facultative bacteria (denitrifying bacteria) are used for degrading organic matters as electron donors and nitrate nitrogen as electron acceptors to carry out denitrification, thereby realizing the synchronous nitrification and denitrification. The synchronous nitrification and denitrification biofilter 90 can directly utilize NO2-N converted by nitrification to react without converting ammonia nitrogen into NO3-N, and because the denitrification rate of NO2-N is about 63% higher than that of NO3-N, the energy consumption and the requirement on oxygen can be further reduced.
The biological membrane of the porous block biological carrier 35 is exchanged with the sewage in the biochemical tank by the flowing of the sewage in the tank, the aeration and agitation of the aeration device 50 and the compression and extension actions of the porous block biological carrier 35, and the biological membrane at the deeper part in the porous block biological carrier 35 can obtain sufficient organic matters, nitrogen, phosphorus and other nutrient elements necessary for the growth of microorganisms under the combined action of the three factors.
The compression and extension actions of the porous massive biological carrier 35 are beneficial to the updating of the biological membrane, when the activity of the biological membrane attached to the porous massive biological carrier 35 is low, the biological membrane falls off in the repeated movement of the porous massive biological carrier 35 and returns to the water again, and a new biological membrane with stronger activity can be generated at the falling part. The microorganisms are mainly attached to the porous massive biological carriers 35 to grow, and when the water quantity and the water quality in the biological filter body 10 fluctuate, the total microorganism quantity in the porous massive biological carriers 35 can not fluctuate obviously, so that the activity of the microorganisms in the system is ensured, and the treatment effect and the stability of the system are further ensured.
In addition, the compression and extension actions of the porous block-shaped biological carrier 35 are also beneficial to the utilization of dissolved oxygen in the biochemical pool. The small bubbles generated by the aeration device 50 can be adsorbed in the pores of the porous massive biological carrier 35 along with the compression and expansion actions of the porous massive biological carrier 35, so that the retention time of the bubbles in the water tank is increased, the utilization rate of oxygen can be improved, and the energy-saving effect is achieved.
The position of the porous block-shaped biological carrier 35 is fixed, which is beneficial to gathering different types of dominant floras on the porous block-shaped biological carrier 35 at different positions. For example, at a position close to the water inlet, since the sewage just enters the biological filter tank body 10 and contains a large amount of organic pollutants, the dominant flora on the porous bulk biological carrier 35 is heterotrophic flora mainly for degrading organic pollutants. At the position close to the water outlet, because the sewage is degraded in the front, the degradable organic pollutants in the sewage are relatively less, and the dominant flora on the porous massive biological carrier 35 is an autotrophic flora mainly degrading ammonia nitrogen. Different areas and different dominant floras of the biological filter body 10 ensure the treatment effect of the biochemical pool.
As shown in FIG. 3, the embodiment of the utility model provides a synchronous nitrification and denitrification MBBR sewage treatment method is still provided, and synchronous nitrification and denitrification MBBR sewage treatment method includes following steps:
step a, converting insoluble organic matters into soluble organic matters by using an anoxic pond 60, and hydrolyzing suspended pollutants and soluble organic matters;
after the sewage enters the anoxic tank 60, the microorganisms in the anoxic tank 60 can hydrolyze suspended pollutants such as starch, fiber, carbohydrate and the like and soluble organic matters in the sewage into organic acids, so that macromolecular organic matters are decomposed into micromolecular organic matters, insoluble organic matters are converted into soluble organic matters, and when products after anoxic hydrolysis enter the aerobic tank 70 for aerobic treatment, the biodegradability of the sewage and the aerobic treatment efficiency can be improved.
B, ammoniating protein and fat in the sewage after the anoxic treatment by using an aerobic tank 70 to free NH3And NH4 +And NH is reacted with3And NH4 +Oxidation to NO3 -；
After the sewage after the anoxic treatment enters the aerobic tank 70, heterotrophic bacteria in the aerobic tank 70 ammoniate pollutants such as protein, fat and the like (N on an organic chain or amino in amino acid) to free ammonia NH3And NH4 +Under the condition of sufficient oxygen supply, the nitrification of autotrophic bacteria can react NH3And NH4 +Oxidation to NO3 -，
Further, the following steps are also executed while the step b is executed: the sewage after the aerobic treatment flows back to the anoxic tank 60, and NO in the sewage after the aerobic treatment is treated by denitrification3 -Reducing into molecular nitrogen.
After the sewage after aerobic treatment enters the anoxic tank 60, the denitrification of the heterotrophic bacteria leads NO to3 -Reduced to molecular nitrogen (N)2) C, N, O, the ecological cycle is completed, and the sewage harmless treatment is realized.
C, settling the sewage after the aerobic treatment by using a settling pond 80;
the sewage after aerobic treatment enters a sedimentation tank 80, and sludge in the sewage is precipitated at the bottom of the sedimentation tank 80 and can be discharged through a sludge discharge port. After anaerobic, aerobic and sedimentation treatment, most organic matters, nitrogen and phosphorus elements in the sewage are degraded.
And d, performing nitrification and denitrification on the precipitated sewage by using the biological filter 90 to remove residual organic matters and nitrogen.
After the precipitated sewage enters the biological filter 90, a small amount of residual pollutants in the sewage are absorbed and degraded by the metabolic activity of the microorganisms on the porous massive biological carriers 35. Carrying out nitration reaction on nitrogen in the sewage in an aerobic state; in an anoxic environment, nitrogen in the sewage is subjected to denitrification reaction, and part of organic matters in the sewage are degraded at the same time. In the biological filter 90, denitrification is performed using facultative bacteria (denitrifying bacteria) with degraded organic matter as an electron donor and nitrate nitrogen as an electron acceptor. The existence of the action of synchronous nitrification and denitrification (short-cut nitrification), the utilization rate of carbon sources is high, the operation cost is saved, the TN of the effluent can be stably controlled below 5mg/L, and the treatment efficiency of the sewage with low pollutant concentration is higher.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. The utility model provides a synchronous nitrification and denitrification MBBR sewage treatment device which is characterized in that, synchronous nitrification and denitrification MBBR sewage treatment device includes:
an anoxic tank for converting insoluble organic matter to soluble organic matter, hydrolyzing suspended contaminants and soluble organic matter, and converting NO to3 -Reducing the nitrogen into molecular nitrogen;
the liquid inlet of the aerobic tank is communicated with the liquid outlet of the anoxic tank, the liquid return port of the aerobic tank is communicated with the anoxic tank, and the aerobic tank is used for ammoniating protein and fat in anoxic hydrolysate to free NH3And NH4 +And NH is reacted with3And NH4 +Oxidation to NO3 -；
A liquid inlet of the sedimentation tank is communicated with a liquid outlet of the aerobic tank;
and the liquid inlet of the biological filter is communicated with the liquid outlet of the sedimentation tank, and the biological filter is used for performing nitrification and denitrification on the settled sewage.
2. The synchronous nitrification and denitrification MBBR sewage treatment plant according to claim 1, wherein the anoxic tank comprises an anoxic tank body and a plurality of groups of biological carrier compression devices arranged in the anoxic tank body, and an aeration device is arranged at the bottom of the anoxic tank body.
3. The synchronous nitrification and denitrification MBBR sewage treatment plant according to claim 1 or 2, wherein suspended biological carriers are placed in the aerobic tank, and an aeration device is arranged at the bottom of the aerobic tank.
4. The MBBR sewage treatment plant according to claim 1, wherein the biological filter comprises a biological filter body, a plurality of groups of biological carrier compression devices and an aeration device arranged at the bottom of the biological filter body.
5. The simultaneous nitrification and denitrification MBBR sewage treatment plant according to claim 2 or 4, wherein the bio-carrier compression device comprises a frame, a driving device, a fixed baffle, a movable baffle, a plurality of lifting shafts, a plurality of fixed shafts and a plurality of porous massive bio-carriers; the fixed baffle is arranged below the movable baffle and is connected with the frame; the fixed shaft and the lifting shaft are arranged at intervals, the lower end of the fixed shaft is connected with the fixed baffle, the upper end of the fixed shaft penetrates through the movable baffle and then is connected with the frame, the lower end of the lifting shaft penetrates through the fixed baffle, the upper end of the lifting shaft penetrates through the movable baffle and then is connected with the driving device, the porous massive biological carriers are sleeved on the fixed shaft and the lifting shaft in a one-to-one correspondence mode, the porous massive biological carriers are located between the fixed baffle and the movable baffle, and the driving device drives the movable baffle to move up and down through the lifting shaft.
6. The MBBR sewage treatment plant according to claim 5, wherein the porous bulk biological carrier is made of a polymer composite material.
7. The MBBR sewage treatment plant according to claim 6, wherein the driving device is a speed reducing motor, and the rotating shaft of the speed reducing motor is connected with the upper end of the lifting shaft.
8. The simultaneous nitrification and denitrification MBBR sewage treatment plant according to claim 7, wherein the porous bulk bio-carriers have a length of 100mm, a height of 100mm and a width of 50 mm.
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