CN113105064A - Pure membrane MBBR (moving bed biofilm reactor) coupled carbon capture autotrophic nitrogen removal system and use method thereof - Google Patents
Pure membrane MBBR (moving bed biofilm reactor) coupled carbon capture autotrophic nitrogen removal system and use method thereof Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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Abstract
The invention discloses an autotrophic nitrogen removal system for pure membrane MBBR (moving bed biofilm reactor) coupled carbon capture and a using method thereof, wherein the autotrophic nitrogen removal system comprises a carbon source capture module, a carbon source recovery module and a methane power generation module, the carbon source capture module comprises a contact tank and a stabilization tank, the carbon source recovery module comprises a sedimentation tank, the methane power generation module comprises an anaerobic fermentation tank and a methane collector, and aeration devices are respectively arranged at the bottoms of the contact tank and the stabilization tank; still including the one-level oxygen deficiency MBBR module, the good oxygen MBBR module of one-level and high-efficient separation module of establishing ties the setting, the contact tank passes through sedimentation tank and one-level oxygen deficiency MBBR module intercommunication, the sedimentation tank communicates with fermentation cylinder and stabilization tank respectively again. According to the invention, the granular COD and the colloidal COD in the sewage are captured by the carbon source capture module and are fermented by the anaerobic fermentation tank to generate the methane, so that the COD in the water body is removed, and simultaneously the methane is generated for power generation of a power plant, thereby realizing the self-sufficiency of energy circulation and improving the environment-friendly and energy-saving effects of the denitrification system.
Description
Technical Field
The invention relates to an autotrophic nitrogen removal system for pure membrane MBBR (moving bed biofilm reactor) coupled carbon capture and a use method thereof, belonging to the technical field of sewage treatment.
Background
The sewage is water which is discharged by certain pollution and loses the original use function in the life and production activities of human beings. At present, domestic water body pollution is mostly water body eutrophication caused by nitrogen and phosphorus pollution, a dynamic balance relation is maintained quantitatively due to the fact that complex substance and energy exchange is carried out between organisms and water and between the organisms in the nature, however, water body eutrophication is caused along with the discharge of water bodies polluted by nitrogen and phosphorus, a part of beneficial aquatic organisms die in a large amount, some pollution-resistant aquatic organisms, particularly algae, start to propagate in a large amount, oxygen in water is consumed, aquatic animals die or are forced to migrate due to oxygen deficiency, and the whole water body ecology is deteriorated or even collapsed.
The sources of nitrogen and phosphorus in the water body are relatively complex, wherein the nitrogen source mainly comprises ammonia nitrogen and nitrate nitrogen in farmland runoff carrying fertilizers and urea and ammonia nitrogen in human and animal excreta, and the phosphorus source mainly comprises fertilizers, agricultural wastes and phosphates in municipal sewage. On one hand, the use of nitrogen and phosphorus in production activities is strictly controlled to reduce pollution sources, and on the other hand, domestic production sewage needs to be subjected to advanced treatment and then discharged, so that a pollution discharge threshold is improved;
meanwhile, Chemical Oxygen Demand (COD) is a chemical method for measuring the amount of reducing substances to be oxidized in a water sample, and is an important and relatively fast-measurable organic pollution parameter in the research of river pollution and industrial wastewater properties and the operation management of wastewater treatment plants, often represented by symbol COD.
Disclosure of Invention
The invention aims to provide a pure-film MBBR (moving bed biofilm reactor) coupled carbon capture autotrophic nitrogen removal system and a use method thereof, and the treatment system solves the problems of high contents of nitrogen, phosphorus and COD (chemical oxygen demand) pollutants in domestic and production sewage, low purification degree of a common treatment mode, high energy consumption in the treatment process and poor energy-saving and environment-friendly effects in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: an autotrophic nitrogen removal system for pure membrane MBBR (moving bed biofilm reactor) coupled carbon capture comprises a carbon source capture module, a carbon source recovery module and a methane power generation module, wherein the carbon source capture module comprises a contact tank and a stabilization tank, the carbon source recovery module comprises a sedimentation tank, the methane power generation module comprises an anaerobic fermentation tank and a methane collector, and aeration devices are respectively arranged at the bottoms of the contact tank and the stabilization tank;
the anaerobic biological filter also comprises a first-stage anoxic MBBR module, a first-stage aerobic MBBR module and a high-efficiency separation module which are arranged in series, wherein the first-stage anoxic MBBR module comprises a first standard size box, an underwater stirrer and anoxic biological fillers, the first-stage aerobic MBBR module comprises a second standard size box, an underwater aerator and aerobic biological fillers, the first aerobic MBBR module is communicated with the first-stage anoxic MBBR module through a reflux pump, and the high-efficiency separation module comprises a coagulation zone, a flocculation zone and a solid-liquid separation zone which are connected in series;
the contact tank is communicated with the first-stage anoxic MBBR module through a sedimentation tank, and the sedimentation tank is communicated with the fermentation tank and the stabilization tank respectively.
The further improved scheme in the technical scheme is as follows:
1. in the scheme, a secondary anoxic MBBR module and a secondary aerobic MBBR module are further arranged between the primary aerobic MBBR module and the high-efficiency separation module, and the secondary anoxic MBBR module is communicated with a carbon source module.
2. In the scheme, the system further comprises a pretreatment module positioned at the front end of the first-stage anoxic MBBR module, and the pretreatment module comprises a combined grid and a grit chamber.
3. In the scheme, the device also comprises a sludge dewatering module positioned at the rear end of the high-efficiency separation module, and the sludge dewatering module is communicated with the solid-liquid separation zone through an axial flow pump.
4. In the scheme, the anaerobic fermentation tank is communicated with the sludge dewatering module.
5. In the scheme, the anaerobic fermentation tank is communicated with the contact tank.
6. In the scheme, the coagulation zone comprises a mixing stirrer and a PAC feeding device.
7. In the above scheme, the flocculation area comprises a flocculation stirrer and a PAM (polyacrylamide) feeding device.
8. In the scheme, the solid-liquid separation zone comprises a gas distribution device, a separation zone, a clear water zone and a slag discharge zone.
In order to achieve the purpose, the invention also provides a use method of the pure membrane MBBR coupled carbon capture autotrophic nitrogen removal system, which comprises the following steps:
s1: introduce the preliminary treatment module with sewage, sewage is earlier through the combination grid, gets into the grit chamber again, subsides 30 ~ 60 s:
s2: the sewage passing through the grit chamber enters a contact chamber, wherein the dissolved oxygen content of the sewage in the contact chamber is not more than 1mg/L, and the sludge inoculated separately in the mixed liquid captures granular COD and colloidal COD in the sewage;
s3: the sewage passing through the contact tank flows into a sedimentation tank, the supernatant flows into a first-level anoxic MBBR module, the carbon-containing sludge of the lower-layer part flows back to a stabilization tank, and the other part of sludge with water flows into an anaerobic fermentation tank;
s4 a: the sludge fermented by the anaerobic fermentation tank is discharged into a sludge dewatering module, the generated methane is collected by a methane collector for power generation, and supernatant liquid after sludge fermentation flows back into the contact tank;
s4 b: supernatant fluid flowing into a first standard size box of the first-stage anoxic MBBR module is stirred by an underwater stirrer to be fully contacted with the anoxic biological filler;
s5: sewage passing through the primary anoxic MBBR module flows into a second standard size box of the primary aerobic MBBR module, is in full contact with aerobic biological fillers through an underwater aerator, and is subjected to short-range nitration reaction on the surface layer of the biological membrane to generate nitrite, and then is subjected to anaerobic ammonia oxidation reaction on the inner layer of the biological membrane by utilizing ammonia nitrogen and nitrite in raw water to perform autotrophic denitrification to generate a small amount of nitrate;
the nitrate nitrogen-containing mixed liquid in the first-stage aerobic MBBR module is conveyed back to the first-stage anoxic MBBR module through a reflux pump for denitrification reaction to realize deep denitrification, and then flows back to the first-stage aerobic MBBR module;
s6: the treated water passing through the first-stage aerobic MBBR module flows into a coagulation zone of the high-efficiency separation module, a proper amount of polyaluminium chloride is added through a PAC (polyaluminium chloride) feeding device, and the polyaluminium chloride is stirred by a mixing stirrer to be in full contact reaction;
s7: the treated water passing through the coagulation zone flows into a flocculation zone, a proper amount of polyacrylamide is added through a PAM (polyacrylamide) feeding device, and the mixture is stirred by a flocculation stirrer to be fully contacted and reacted;
s8: the treated water passing through the flocculation zone flows into a solid-liquid separation zone, air is pressurized by an air distribution device arranged at the bottom of the separation zone to dissolve air into the water, then the air is released by decompression, a large amount of rising micro bubbles are generated from the bottom, the micro bubbles and suspended matters act to form a mixture with the specific gravity less than 1, the mixture is suspended on the water surface to form floating slag, the clear water flows downwards to enter a clear water zone, and the upper layer enters a slag discharge zone to be discharged;
s9: the clean water in the clean water area is disinfected and then discharged after reaching the standard;
s10: and the sludge deposited at the bottom of the separation area is discharged into a sludge dewatering module through an axial flow pump, and is transported out after dewatering.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. according to the pure-film MBBR coupled carbon capture autotrophic nitrogen removal system and the use method thereof, modular construction and installation are performed through standardized production of the carbon source capture module and the MBBR module, so that the construction period of the sewage treatment system is greatly shortened, and due to mutual independence of the modules, flexible planar arrangement engineering practice shows that 30-50% of occupied land can be saved, and the modules can be added or subtracted according to actual conditions, so that the system is very convenient and fast.
2. According to the pure-film MBBR coupled carbon capture autotrophic nitrogen removal system and the use method thereof, the carbon source capture module is used for capturing granular COD and colloidal COD in sewage and generating methane through anaerobic fermentation tank fermentation, so that COD in a water body is removed, the generated methane is used for power generation of a power plant, the energy circulation self-sufficiency is realized, and the environment-friendly and energy-saving effects of the nitrogen removal system are improved.
3. According to the pure-film MBBR coupled carbon capture autotrophic nitrogen removal system and the use method thereof, anaerobic ammonia oxidation autotrophic nitrogen removal is performed in the MBBR module, so that the yield of residual sludge in a biochemical tank is greatly reduced, an additional carbon source is reduced or even not required to be added, the aeration amount of an aerobic tank can be saved, the operation cost of sewage treatment is further reduced, meanwhile, the carbon emission in the operation process of a sewage plant is reduced, and the energy-saving and environment-friendly effects are improved.
4. The invention relates to an autotrophic nitrogen removal system with pure membrane MBBR coupled carbon capture and a use method thereof.
5. According to the pure-film MBBR coupled carbon capture autotrophic nitrogen removal system and the use method thereof, the MBBR deep nitrogen and phosphorus removal treatment can be realized by utilizing the linkage of the secondary biochemical modules through the addition of the secondary biochemical modules when autotrophic nitrogen removal is not performed.
Drawings
FIG. 1 is a schematic block diagram of an embodiment 1 of the pure membrane MBBR-coupled carbon capture autotrophic nitrogen removal system of the present invention;
FIG. 2 is a schematic block diagram of an embodiment 2 of the pure membrane MBBR-coupled carbon capture autotrophic nitrogen removal system of the present invention.
In the figure: 01. a carbon source capture module; 011. a contact tank; 012. a stabilization tank; 0111. an aeration device; 02. a carbon source recovery module; 021. a sedimentation tank; 03. a methane power generation module; 031. anaerobic fermentation tank; 032. a methane collector; 1. a first-level anoxic MBBR module; 11. a first standard size box; 12. an underwater agitator; 13. anoxic biological fillers; 2. a primary aerobic MBBR module; 21. a second standard size box; 22. an underwater aerator; 23. aerobic biological filler; 24. a reflux pump; 3. a secondary anoxic MBBR module; 4. a secondary aerobic MBBR module; 5. a high efficiency separation module; 51. a coagulation zone; 511. a mixing agitator; 512. a PAC delivery device; 52. a flocculation zone; 521. a flocculation stirrer; 522. a PAM delivery device; 53. a solid-liquid separation zone; 531. a gas distribution device; 532. a separation zone; 533. a clear water zone; 534. a slag discharge area; 6. a carbon source module; 61. a medicine storage barrel; 62. dosing a metering pump; 7. a preprocessing module; 71. a combination grid; 72. a grit chamber; 8. a sludge dewatering module; 81. an axial flow pump.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1: an autotrophic nitrogen removal system for pure membrane MBBR (moving bed biofilm reactor) coupled carbon capture, referring to the attached drawing 1, comprises a carbon source capture module 01, a carbon source recovery module 02 and a methane power generation module 03, wherein the carbon source capture module 01 comprises a contact tank 011 and a stabilization tank 012, the carbon source recovery module 02 comprises a sedimentation tank 021, the methane power generation module 03 comprises an anaerobic fermentation tank 031 and a methane collector 032, and aeration devices 0111 are respectively installed at the bottoms of the contact tank 011 and the stabilization tank 012;
the anaerobic biological treatment device is characterized by further comprising a first-stage anoxic MBBR module 1, a first-stage aerobic MBBR module 2 and a high-efficiency separation module 5 which are arranged in series, wherein the first-stage anoxic MBBR module comprises a first standard size box 11, an underwater stirrer 12 and anoxic biological fillers 13, the first-stage aerobic MBBR module 2 comprises a second standard size box 21, an underwater aerator 22 and aerobic biological fillers 23, the first aerobic MBBR module 2 is communicated with the first-stage anoxic MBBR module 1 through a backflow pump 24, and the high-efficiency separation module 5 comprises a coagulation zone 51, a flocculation zone 52 and a solid-liquid separation zone 53 which are connected in series;
the contact tank 011 is communicated with the first-stage anoxic MBBR module 1 through a sedimentation tank 021, and the sedimentation tank 021 is communicated with a fermentation tank 031 and a stabilization tank 012 respectively.
The system further comprises a pretreatment module 7 positioned at the front end of the first-level anoxic MBBR module 1, wherein the pretreatment module 7 comprises a combined grating 71 and a grit chamber 72.
The device also comprises a sludge dewatering module 8 positioned at the rear end of the high-efficiency separation module 5, and the sludge dewatering module 8 is communicated with the solid-liquid separation zone 53 through an axial flow pump 81; the anaerobic fermentation tank 031 is communicated with the sludge dewatering module 8; the anaerobic fermentation tank 031 is communicated with the contact tank 011.
The coagulation zone 51 comprises a mixing stirrer 511 and a PAC feeding device 512; the flocculation area 52 comprises a flocculation stirrer 521 and a PAM (polyacrylamide) putting device 522; the solid-liquid separation zone 53 comprises a gas distribution device 531, a separation zone 532, a clean water zone 533 and a slag discharge zone 534.
Example 2: an autotrophic nitrogen removal system for pure membrane MBBR (moving bed biofilm reactor) coupled carbon capture refers to the attached figure 2, and comprises a carbon source capture module 01, a carbon source recovery module 02 and a methane power generation module 03, wherein the carbon source capture module 01 comprises a contact tank 011 and a stabilization tank 012, the carbon source recovery module 02 comprises a sedimentation tank 021, the methane power generation module 03 comprises an anaerobic fermentation tank 031 and a methane collector 032, and aeration devices 0111 are respectively installed at the bottoms of the contact tank 011 and the stabilization tank 012;
the device is characterized by further comprising a first-stage anoxic MBBR module 1, a first-stage aerobic MBBR module 2, a second-stage anoxic MBBR module 3, a second-stage aerobic MBBR module 4 and a high-efficiency separation module 5 which are arranged in series, wherein the first-stage anoxic MBBR module 1 and the second-stage anoxic MBBR module 3 respectively comprise a first standard size box 11, an underwater stirrer 12 and anoxic biological fillers 13, the first-stage aerobic MBBR module 2 and the second-stage aerobic MBBR module 4 respectively comprise a second standard size box 21, an underwater aerator 22 and aerobic biological fillers 23, the first aerobic MBBR module 2 is communicated with the first-stage anoxic MBBR module 1 through a backflow pump 24, the second-stage anoxic MBBR module 4 is communicated with a carbon source module 6, the carbon source module 6 comprises a medicine storage barrel 61 for storing methanol or acetic acid and a metering pump dosing 62, and the high-efficiency separation module 5 comprises a coagulation area 51, a flocculation area 52 and a solid-liquid separation area 53 which;
the contact tank 011 is communicated with the first-stage anoxic MBBR module 1 through a sedimentation tank 021, and the sedimentation tank 021 is communicated with a fermentation tank 031 and a stabilization tank 012 respectively.
The system further comprises a pretreatment module 7 positioned at the front end of the first-level anoxic MBBR module 1, wherein the pretreatment module 7 comprises a combined grating 71 and a grit chamber 72.
The device also comprises a sludge dewatering module 8 positioned at the rear end of the high-efficiency separation module 5, and the sludge dewatering module 8 is communicated with the solid-liquid separation zone 53 through an axial flow pump 81; the anaerobic fermentation tank 031 is communicated with the sludge dewatering module 8; the anaerobic fermentation tank 031 is communicated with the contact tank 011.
The coagulation zone 51 comprises a mixing stirrer 511 and a PAC feeding device 512; the flocculation area 52 comprises a flocculation stirrer 521 and a PAM (polyacrylamide) putting device 522; the solid-liquid separation zone 53 comprises a gas distribution device 531, a separation zone 532, a clean water zone 533 and a slag discharge zone 534.
Example 3: a method for using a pure membrane MBBR coupled carbon capture autotrophic nitrogen removal system comprises the following steps:
s1: introduce the preliminary treatment module with sewage, sewage is earlier through the combination grid, gets into the grit chamber again, subsides 30 ~ 60 s:
s2: the sewage passing through the grit chamber enters a contact tank 011, wherein the dissolved oxygen content of the sewage in the contact tank 011 is not more than 1mg/L, and the sludge inoculated separately in the mixed liquid captures granular COD and colloidal COD in the sewage; the aeration device in the contact tank mainly has the functions of increasing the EPS (extracellular polymeric substance) content, improving the biological flocculation capacity and increasing the carbon source recovery rate;
s3: the sewage passing through the contact tank 011 flows into a sedimentation tank 021, the supernatant liquid flows into a first-stage anoxic MBBR module 1, the carbon-containing sludge of the lower layer part flows back to a stabilization tank 012, and the sludge with water of the other part flows into an anaerobic fermentation tank 031;
s4 a: the sludge fermented by the anaerobic fermentation tank 031 is discharged into the sludge dewatering module 8, the generated methane is collected by the methane collector 032 for power generation, and the supernatant after sludge fermentation flows back into the contact tank 011;
s4 b: supernatant liquor flowing into a first standard size box 11 of a first-level anoxic MBBR module 1 is stirred by an underwater stirrer 12 and fully contacted with an anoxic biological filler 13; no specific contact time is determined according to the actual hydraulic retention time of the anoxic zone, and the contact time is the anoxic hydraulic retention time;
s5: sewage passing through the first-level anoxic MBBR module 1 flows into a second standard size box 21 of the first-level aerobic MBBR module 2, fully contacts with an aerobic biological filler 23 through an underwater aerator 22, performs short-range nitration reaction on the surface layer of the biological membrane to generate nitrite, and then performs anaerobic ammonia oxidation reaction on the inner layer of the biological membrane by using ammonia nitrogen and the nitrite in raw water to perform autotrophic denitrification to generate a small amount of nitrate;
the nitrate nitrogen-containing mixed liquid in the first-stage aerobic MBBR module 2 is conveyed back to the first-stage anoxic MBBR module 1 through a reflux pump 24 for denitrification reaction to realize deep denitrification, and then flows back to the first-stage aerobic MBBR module 2;
s6: the treated water passing through the primary aerobic MBBR module 2 flows into the coagulation zone 51 of the high-efficiency separation module 5, and a proper amount of polyaluminium chloride is added through a PAC (polyaluminium chloride) adding device 512 and stirred by a mixing stirrer 511 to be in full contact reaction; no specific contact time is determined according to the actual hydraulic retention time of the aerobic zone, and the contact time is the aerobic hydraulic retention time;
s7: the treated water passing through the coagulation zone 51 flows into the flocculation zone 52, a proper amount of polyacrylamide is added through a PAM adding device 522, and the mixture is stirred by a flocculation stirrer 521 to be fully contacted and reacted;
s8: the treated water passing through the flocculation zone 52 flows into the solid-liquid separation zone 53, air is pressurized by the air distribution device 531 arranged at the bottom of the separation zone 532 to be dissolved into the water, then the air is released by decompression, a large amount of rising tiny bubbles are generated from the bottom, the tiny bubbles and suspended matters act to form a mixture with the specific gravity less than 1, the mixture is suspended on the water surface to form scum, the clear water flows downwards into the clear water zone 533, and the upper layer enters the slag discharge zone 534 to be discharged;
s9: the clean water in the clean water area 533 is discharged after reaching the standard after being disinfected;
s10 b: the sludge deposited at the bottom of the separation area 532 is discharged into a sludge dewatering module 8 through an axial flow pump 81, and is transported out after dewatering.
Example 4: when the carbon source capture module is not used, the secondary biochemical module can be started to be used as a pure membrane MBBR nitrogen and phosphorus removal system, and the following steps are added
A1: the sewage passing through the primary aerobic MBBR module 2 flows into a first standard size box 11 of a secondary anoxic MBBR module 4, and is stirred by an underwater stirrer 12 to be fully contacted with an anoxic biological filler 13;
when the secondary anoxic MBBR module 4 works, the carbon source module 6 on the secondary anoxic MBBR module 4 puts carbon sources into the first standard size box 11;
a2: the sewage passing through the secondary anoxic MBBR module 4 flows into the second standard size box 21 of the secondary aerobic MBBR module 4 and fully contacts with the aerobic biological filler 23 through the underwater aerator 22.
By adopting the scheme, modular construction and installation are carried out through standardized production of the carbon source capture module and the MBBR module, so that the construction period of the sewage treatment system is greatly shortened, and because the modules are mutually independent, the floor area can be saved by 30-50% as shown in the planar arrangement flexible engineering practice, and the modules can be added and subtracted according to the actual situation, so that the sewage treatment system is very convenient and fast.
In addition, it catches granule nature COD and colloidal COD and produces methane through anaerobic fermentation tank fermentation in with sewage through carbon source catching module to at the colleague of getting rid of COD in the water, produce methane and be used for power plant production power, realize that the energy circulation is self-supporting, improve nitrogen removal system's environmental protection and energy saving effect.
In addition, through anaerobic ammonia oxidation autotrophic denitrification in the MBBR module, the yield of excess sludge in the biochemical tank is greatly reduced, and the addition of an additional carbon source is reduced or even not required, so that the aeration quantity of the aerobic tank can be saved, the operation cost of sewage treatment is further reduced, and meanwhile, the carbon emission in the operation process of a sewage plant is reduced, and the energy-saving and environment-friendly effects are improved.
In addition, after solid waste and inorganic particulate matters are removed through a combined grid and a grit chamber of the pretreatment module, the removal efficiency of pollutants (ammonia nitrogen and total nitrogen) in a biochemical area is greatly improved through a first-level anoxic MBBR module, a first-level aerobic MBBR module and the screening and enriching effects of a biomembrane on functional bacteria, and suspended matters and total phosphorus in water can form solid waste residues after passing through a coagulation area and a flocculation area of a high-efficiency separation module, are brought to the water surface by a gas distribution device in solid-liquid separation for discharge and separation, and the water quality reaching the deep purification standard can be obtained after clear water disinfection, so that the treatment effect is good, and the treatment speed is high.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. An autotrophic nitrogen removal system for pure membrane MBBR (moving bed biofilm reactor) coupled carbon capture is characterized by comprising a carbon source capture module (01), a carbon source recovery module (02) and a methane power generation module (03), wherein the carbon source capture module (01) comprises a contact tank (011) and a stabilization tank (012), the carbon source recovery module (02) comprises a sedimentation tank (021), the methane power generation module (03) comprises an anaerobic fermentation tank (031) and a methane collector (032), and an aeration device (0111) is installed at the bottoms of the contact tank (011) and the stabilization tank (012);
the anaerobic biological filter is characterized by further comprising a first-stage anoxic MBBR module (1), a first-stage aerobic MBBR module (2) and a high-efficiency separation module (5) which are arranged in series, wherein the first-stage anoxic MBBR module comprises a first standard size box (11), an underwater stirrer (12) and anoxic biological fillers (13), the first-stage aerobic MBBR module (2) comprises a second standard size box (21), an underwater aerator (22) and aerobic biological fillers (23), the first aerobic MBBR module (2) is communicated with the first-stage anoxic MBBR module (1) through a backflow pump (24), and the high-efficiency separation module (5) comprises a coagulation zone (51), a flocculation zone (52) and a solid-liquid separation zone (53) which are connected in series;
the contact tank (011) is communicated with the first-stage anoxic MBBR module (1) through a sedimentation tank (021), and the sedimentation tank (021) is communicated with the fermentation tank (031) and the stabilization tank (012) respectively.
2. The pure membrane MBBR-coupled carbon capture autotrophic nitrogen removal system according to claim 1, wherein a secondary anoxic MBBR module (3) and a secondary aerobic MBBR module (4) are further installed between the primary aerobic MBBR module (2) and the high efficiency separation module (5), and the secondary anoxic MBBR module (4) is communicated with a carbon source module (6).
3. The pure membrane MBBR-coupled carbon capture autotrophic nitrogen removal system according to claim 1, further comprising a pretreatment module (7) located at the front end of the primary anoxic MBBR module (1), said pretreatment module (7) comprising a combination grid (71) and a grit chamber (72).
4. The system of claim 1, further comprising a sludge dewatering module (8) located at the rear end of the high efficiency separation module (5), wherein the sludge dewatering module (8) is in communication with the solid liquid separation zone (53) via an axial flow pump (81).
5. The pure membrane MBBR-coupled carbon capture autotrophic nitrogen removal system according to claim 4, wherein said anaerobic fermentor (031) is in communication with a sludge dewatering module (8).
6. The pure membrane MBBR-coupled carbon capture autotrophic nitrogen removal system according to claim 1, wherein the anaerobic fermentor (031) is in communication with a contact tank (011).
7. The pure film MBBR coupled carbon capture autotrophic nitrogen removal system according to claim 1, wherein said coagulation zone (51) comprises a mixing agitator (511) and a PAC dosing device (512).
8. The pure film MBBR coupled carbon capture autotrophic nitrogen removal system according to claim 1, wherein the flocculation zone (52) comprises a flocculation agitator (521) and a PAM dosing device (522).
9. The pure membrane MBBR-coupled carbon capture autotrophic nitrogen removal system of claim 1, wherein said solid-liquid separation zone (53) comprises a gas distribution device (531), a separation zone (532), a clean water zone (533) and a reject zone (534).
10. The method of using a pure membrane MBBR coupled carbon capture autotrophic nitrogen removal system according to any one of claims 1-9, comprising the steps of:
s1: introduce the preliminary treatment module with sewage, sewage is earlier through the combination grid, gets into the grit chamber again, subsides 30 ~ 60 s:
s2: the sewage passing through the grit chamber enters a contact tank (011), wherein the dissolved oxygen content of the sewage in the contact tank (011) is not more than 1mg/L, and the sludge inoculated additionally in the mixed liquid captures granular COD and colloidal COD in the sewage;
s3: the sewage passing through the contact tank (011) flows into a sedimentation tank (021), the supernatant flows into a first-level anoxic MBBR module (1), the carbon-containing sludge of the lower layer part flows back to a stabilization tank (012), and the other part of sludge with water flows into an anaerobic fermentation tank (031);
s4 a: the sludge fermented by the anaerobic fermentation tank (031) is discharged into a sludge dewatering module (8), the generated methane is collected by a methane collector (032) for power generation, and supernatant liquor after sludge fermentation flows back into the contact tank (011);
s4 b: supernatant fluid flowing into a first standard size box (11) of a first-stage anoxic MBBR module (1) is stirred by an underwater stirrer (12) and fully contacted with an anoxic biological filler (13);
s5: sewage passing through the primary anoxic MBBR module (1) flows into a second standard size box (21) of the primary aerobic MBBR module (2), is in full contact with an aerobic biological filler (23) through an underwater aerator (22), carries out short-range nitration reaction on the surface layer of the biological membrane to generate nitrite, and then carries out anaerobic ammoxidation reaction on the inner layer of the biological membrane by utilizing ammonia nitrogen and the nitrite in raw water to carry out autotrophic nitrogen removal to generate a small amount of nitrate;
the nitrate nitrogen-containing mixed liquid in the first-stage aerobic MBBR module (2) is conveyed back to the first-stage anoxic MBBR module (1) through a reflux pump (24) for denitrification reaction to realize deep denitrification, and then flows back to the first-stage aerobic MBBR module (2);
s6: the treated water passing through the primary aerobic MBBR module (2) flows into a coagulation zone (51) of the high-efficiency separation module (5), and a proper amount of polyaluminium chloride is added through a PAC (PAC) adding device (512) and stirred by a mixing stirrer (511) to be in full contact reaction;
s7: the treated water passing through the coagulation area (51) flows into a flocculation area (52), a proper amount of polyacrylamide is added through a PAM adding device (522), and the mixture is stirred by a flocculation stirrer (521) to be fully contacted and reacted;
s8: the treated water passing through the flocculation area (52) flows into a solid-liquid separation area (53), air is pressurized by an air distribution device (531) arranged at the bottom of the separation area (532) to be dissolved into the water, then the air is released by decompression, a large amount of rising micro bubbles are generated from the bottom, the micro bubbles and suspended matters act to form a mixture with the specific gravity less than 1, the mixture is suspended on the water surface to form scum, the clear water flows downwards to enter a clear water area (533), and the upper layer enters a slag discharge area (534) to be discharged;
s9: the clean water in the clean water area (533) is disinfected and then discharged after reaching the standard;
s10: and the sludge deposited at the bottom of the separation area (532) is discharged into a sludge dewatering module (8) through an axial flow pump (81) and is transported out after dewatering.
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