Sewage treatment device and sewage treatment method

Abstract

The invention provides a sewage treatment device and a sewage treatment method. The sewage treatment device comprises a biological reaction tank, a sedimentation tank, a membrane tank and a biological activated carbon filter tank which are connected in sequence; the interior of the tank body of the biological reaction tank is divided into a facultative zone, a micro-aerobic zone, an aerobic zone and an internal reflux zone which are sequentially communicated with one another by a plurality of partitions; a comprehensive detector and a water impeller are arranged in each zone, and aeration devices are arranged in the facultative zone and the aerobic zone; sewage enters the aerobic zone through the facultative zone and the micro-aerobic zone in sequence along a first water flow path, one part of water in the aerobic zone enters the facultative zone through the internal reflux zone along a second water flow path, and the other part of water is discharged, is treated through the sedimentation tank, the membrane tank and the biological activated carbon filter tank in sequence, and is discharged; the comprehensive detector is used for detecting dissolved oxygen and oxidation-reduction potential, a flow guide baffle is arranged in each area, the first water flow path and the second water flow path are S-shaped, and the dissolved oxygen and the oxidation-reduction potential in each area are within a preset range. According to the invention, high-efficiency, high-quality and low-cost treatment of sewage can be realized.

Description

Technical Field

[0001] The present invention relates to the field of membrane sewage treatment, and in particular to a sewage treatment device and a sewage treatment method. Background Art

[0002] Traditional sewage treatment processes include anaerobic anoxic aerobic (AAO) process, oxidation ditch process, SBR process, biofilm process, etc. These traditional sewage biological treatment processes have certain limitations and points that can be improved. The AAO process produces a high amount of residual sludge, and the cost of subsequent sludge treatment is high. In addition, the nitrogen removal rate is not high when treating low C / N ratio sewage, and a carbon source needs to be added. The oxidation ditch process occupies a large area and has high operating costs. The SBR process has a small processing capacity and is not suitable for large projects, and sludge swelling is prone to occur. The initial investment of the biofilm method is high, the biofilm is prone to clogging, and the operation and maintenance costs are high. In general, it is necessary to make improvements based on traditional sewage treatment technologies to reduce investment and operating costs while ensuring the efficiency of pollutant removal.

[0003] In recent years, short-cut nitrification and denitrification (ANOMO) and anaerobic ammonium oxidation (AAMOX) have received widespread attention in wastewater treatment. Short-cut nitrification and denitrification involves controlling the nitrification reaction to the nitrification stage, where ammonia-oxidizing bacteria (AOB) oxidize ammonia to nitrite, while inhibiting nitrite-oxidizing bacteria (NOB) from further oxidizing nitrite to nitrate, thereby accumulating nitrite-nitrogen. Denitrifying bacteria are then used to reduce nitrite to nitrogen gas for denitrification, thereby saving aeration energy and carbon source for denitrification.

[0004] In the sewage treatment process, microbial degradation of pollutants such as BOD5, nitrogen, and phosphorus proceeds in a certain order, and the degradation and absorption of each pollutant requires a specific environment. Only by achieving the most precise control over the treatment process can pollutants be removed more quickly and efficiently. The combination of ozone oxidation and nanocatalytic ceramic membranes has been applied to the deep treatment of wastewater, which not only improves the removal efficiency of pollutants but also reduces membrane fouling. Ceramic membranes have strong chemical stability and can withstand severe oxidative conditions in the presence of ozone and hydroxyl radicals. At the same time, ozone oxidation also has the effect of reducing membrane fouling and improving permeability. Because ceramic membranes have nanoscale membrane pores, they can not only effectively intercept large molecular organic matter in water, but also couple catalytic ozone oxidation with ceramic membrane ultrafiltration to achieve efficient removal of trace new pollutants in sewage. Nanoceramic membrane filtration combined with in situ ozone oxidation and biological activated carbon (BAC) filtration has a high removal efficiency for trace new pollutants.

[0005] In response to the need to strengthen the control of new pollutants and reduce pollution and carbon emissions, there is an urgent need to develop low-carbon, high-efficiency, and low-cost high-quality water treatment technologies.

[0006] It should be noted that the information disclosed in the above background technology section is only used to understand the background of this application, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Summary of the Invention

[0007] In order to make up for the shortcomings of the existing technology, the present invention provides a sewage treatment device and a sewage treatment method, which can solve many problems in the traditional sewage treatment process, such as insufficient carbon source, poor effect of treating low C / N ratio sewage, large sludge output, high treatment cost, and inability to effectively remove trace new pollutants.

[0008] The present invention adopts the following technical solutions:

[0009] In a first aspect, a sewage treatment device is provided, comprising a biological reaction tank, a sedimentation tank, a membrane tank, and a biological activated carbon filter; the biological reaction tank comprises a tank body, the interior of the tank body being divided by a plurality of partitions into interconnected facultative oxic zones, microaerobic zones, aerobic zones, and internal recirculation zones; each zone is provided with a comprehensive detector and a flow pusher, and the facultative oxic zones and the aerobic zones are provided with aeration devices; a first water outlet of the aerobic zone is connected to the sedimentation tank, the sedimentation tank has a second water outlet and a first mud outlet, the second water outlet is connected to the membrane tank, the membrane tank has a catalytic ceramic membrane assembly and an aeration device, the membrane tank has a third water outlet and a second mud outlet, and the third water outlet is connected to the biological activated carbon filter;

[0010] The sewage to be treated passes through the facultative oxygen zone and the micro-aerobic zone in sequence along the first water flow path and enters the aerobic zone. A part of the water in the aerobic zone passes through the internal recirculation zone along the second water flow path and enters the facultative oxygen zone for internal circulation. The other part of the water is discharged from the first water outlet and then passes through the sedimentation tank, membrane tank and biological activated carbon filter in sequence for treatment, and then is discharged from the biological activated carbon filter. Among them, the comprehensive detector in each zone of the biological reaction tank includes a dissolved oxygen detection probe and an oxidation-reduction potential detection probe, which are respectively used to detect the dissolved oxygen and oxidation-reduction potential in the corresponding zone. A guide baffle for extending the water flow path is also provided in each zone. The first water flow path and the second water flow path are both S-shaped, and the dissolved oxygen and oxidation-reduction potential in each zone are within a predetermined range.

[0011] In a second aspect, a sewage treatment method is provided, which is performed using the sewage treatment device described in the first aspect, comprising the following steps:

[0012] (1) After the sewage to be treated enters the facultative aerobic zone from the water inlet, it passes through the facultative aerobic zone and the microaerobic zone in sequence along the first water flow path under the driving action of each flow propeller, and enters the aerobic zone;

[0013] (2) In the aerobic zone, a portion of the sewage is discharged from the first outlet to the sedimentation tank, and the other portion of the sewage flows along the second water path through the internal recirculation zone into the facultative aerobic zone for internal circulation;

[0014] (3) The sewage coming out of the first outlet is treated in the sedimentation tank, membrane tank and biological activated carbon filter tank in turn before being discharged.

[0015] The present invention has the following beneficial effects:

[0016] The sewage treatment device of the present invention includes a biological reaction tank, a sedimentation tank, a membrane tank and a biological activated carbon filter. In the biological reaction tank, the tank body is divided into an anaerobic zone, a microaerobic zone, an aerobic zone and an internal recirculation zone which are interconnected by partitions. The reasonable layout of each zone cooperates with the flow propeller, the guide baffle and the like to control the sewage to have an S-shaped water flow path in the sewage treatment device, thereby carrying out the biodegradation of pollutants in the sewage (cooperative operation of short-range nitrification and denitrification, anaerobic ammonia oxidation, etc., and efficient nitrogen and phosphorus removal). In the biodegradation of pollutants, by coordinating the reasonable space of each zone, The layout of the bioreactor, the flow propellants, the guide baffles, the aeration devices, the integrated detectors, etc., can control the dissolved oxygen and redox potential in each zone within a predetermined range. The unique structure of the bioreactor allows the sewage to circulate continuously and mix evenly within the bioreactor, making short-circuiting less likely to occur and eliminating dead water areas. This can significantly improve water treatment efficiency and effluent quality. The effluent from the bioreactor is then sequentially processed through a sedimentation tank, a membrane tank, and a biological activated carbon filter, further efficiently removing biodegradable organic matter and trace new pollutants. The present invention can achieve high-efficiency, high-quality, and low-cost deep treatment of sewage without any external carbon source.

[0017] Under the preferred technical solution, the control system can control the ORP of each zone under intelligent and precise regulation to achieve precise control of microbial reactions, shorten the denitrification reaction process, and thus achieve efficient denitrification and phosphorus removal. It can also carbonize the activated sludge in situ, reducing the amount of external carbon source and sludge production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic top view of a sewage treatment device in a preferred embodiment of the present invention.

[0019] Figure 2 1 is a scanning electron microscope image of the manganese catalytic ceramic membrane used in the preferred embodiment of the present invention.

[0020] Figure 3 Schematic diagram of a control system in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0021] The following is a detailed description of the embodiments of the present invention. It should be emphasized that the following description is merely illustrative and is not intended to limit the scope and application of the present invention. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0022] A specific embodiment of the present invention provides a sewage treatment device, which includes a biological reaction tank, a sedimentation tank, a membrane tank and a biological activated carbon filter; the biological reaction tank includes a tank body, the interior of the tank body is separated by multiple partitions into mutually connected facultative oxic zone, microaerobic zone, aerobic zone and internal recirculation zone; each zone is provided with a comprehensive detector and a flow pusher, and the facultative oxic zone and the aerobic zone are provided with an aeration device; the first water outlet of the aerobic zone is connected to the sedimentation tank, the sedimentation tank has a second water outlet and a first mud outlet, the second water outlet is connected to the membrane tank, the membrane tank has a catalytic ceramic membrane assembly and an aeration device, the membrane tank has a third water outlet and a second mud outlet, and the third water outlet is connected to the biological activated carbon filter; the sewage to be treated The water flows along the first water flow path, passes through the facultative oxic zone and the microaerobic zone in sequence, enters the aerobic zone, a part of the water in the aerobic zone flows along the second water flow path, passes through the internal recirculation zone, enters the facultative oxic zone for internal circulation, and the other part of the water is discharged from the first water outlet, passes through the sedimentation tank, the membrane tank and the biological activated carbon filter in sequence for treatment, and is then discharged from the biological activated carbon filter; wherein, the comprehensive detector in each zone of the biological reaction tank includes a dissolved oxygen detection probe and an oxidation-reduction potential detection probe, which are respectively used to detect the dissolved oxygen and oxidation-reduction potential in the corresponding zone; a guide baffle for extending the water flow path is also provided in each zone; the first water flow path and the second water flow path are both S-shaped, and the dissolved oxygen and oxidation-reduction potential in each zone are within a predetermined range.

[0023] Preferably, there are 1-3 facultative aerobic zones, 1-2 microaerobic zones, 1-3 aerobic zones, and 1-3 internal recirculation zones.

[0024] like Figure 1 As shown, a preferred embodiment of the present invention provides a sewage treatment device, including a biological reaction tank, a sedimentation tank 100, a membrane tank 200 and a biological activated carbon filter 300; the biological reaction tank includes a tank body, the interior of which is divided into the following 10 interconnected zones by multiple partitions:

[0025] The first anoxic zone 1 has a water inlet, a comprehensive detector D, a flow pusher T and an aeration device;

[0026] The second oxygen-enriched zone 2 has a comprehensive detector D and a flow pusher T;

[0027] The third oxygenation zone 3 has a comprehensive detector D and a flow pusher T;

[0028] The first micro-aerobic zone 4 has a comprehensive detector D and a flow pusher T;

[0029] The second micro-oxygen zone 5 has a comprehensive detector D and a flow pusher T;

[0030] The first aerobic zone 6 has a comprehensive detector D and a flow pusher T;

[0031] The second aerobic zone 7 has a comprehensive detector D, a first water outlet, and an aeration device;

[0032] The first internal reflux zone 8 has a comprehensive detector D and a flow pusher T;

[0033] The second internal reflux zone 9 has a comprehensive detector D and a flow pusher T;

[0034] The third internal recirculation zone 10 has a comprehensive detector D and a flow pusher T;

[0035] The first water outlet of the second aerobic zone 7 is connected to the sedimentation tank 100 , and the sedimentation tank 100 has a second water outlet and a first mud outlet, and the second water outlet is connected to the membrane tank 200 ;

[0036] The membrane pool 200 has a catalytic ceramic membrane assembly C and an aeration device. The membrane pool 200 has a third water outlet and a second mud outlet. The third water outlet is connected to the biological activated carbon filter 300.

[0037] After the sewage to be treated enters the first facultative aerobic zone 1 from the water inlet, it passes through the first facultative aerobic zone 1, the second facultative aerobic zone 2, the third facultative aerobic zone 3, the first microaerobic zone 4, the second microaerobic zone 5 and the first aerobic zone 6 in sequence along the first water flow path, and enters the second aerobic zone 7;

[0038] Part of the water entering the second aerobic zone 7 passes through the first internal recirculation zone 8, the second internal recirculation zone 9 and the third internal recirculation zone 10 in sequence along the second water flow path and enters the first facultative anoxic zone 1 for internal circulation. The other part of the water is discharged from the first water outlet and is sequentially treated by the sedimentation tank 100, the membrane tank 200 and the biological activated carbon filter 300 before being discharged from the biological activated carbon filter 300. The comprehensive detector D in each zone includes a dissolved oxygen detection probe and an oxidation-reduction potential detection probe, which are respectively used to detect the dissolved oxygen and oxidation-reduction potential in the corresponding zone. A guide baffle is also provided in each zone. The first water flow path and the second water flow path are both S-shaped. The dissolved oxygen and oxidation-reduction potential in each zone are within a predetermined range.

[0039] Among them, through various baffles and guide baffles, better water flow diversion and reaction zoning can be achieved, so as to guide the water flow to form an S-shaped path to flow to each zone, extend the water flow path and slow down the water flow speed, significantly improve the pollutant reaction and conversion efficiency, and avoid short-flow and dead-angle problems. At the same time, in order to strengthen the directionality and power support of water flow between different zones, a number of flow pushers are set up. Each flow pusher is set at the bottom of the corresponding zone along the water flow direction according to the dead-angle situation of water flow. The flow pusher works together with the guide baffle and baffle to realize the overall hydraulic structure layout of "directional zoning boosting and progressive reaction layer by layer", further ensuring that the water flow rate in each zone matches the respective reaction requirements, taking into account the residence time and flow state control. Figure 1 In the figure, the dotted arrow indicates the direction of water flow. In the sewage treatment device of the present invention, it is divided into 10 zones by baffles, and the flow promoter and the guide baffle are used to control the sewage to have an S-shaped water flow path. During the sewage treatment process, the dissolved oxygen and redox potential in each zone can be controlled within a predetermined range by coordinating the reasonable spatial layout of each zone in the sewage treatment device, each flow promoter, guide baffle, each aeration device, comprehensive detector, etc. The water treated in the biological reactor enters the sedimentation tank, and then the upper clarified water in the sedimentation tank enters the membrane tank and enters the biological activated carbon filter after the coordinated treatment of the ultrafiltration effect of the catalytic ceramic membrane and in-situ ozone aeration. The lower sludge mixed liquor of the sedimentation tank is refluxed to the biological reactor for treatment. The sewage treatment device of the present invention can be used to treat sewage types including but not limited to domestic sewage and hospital sewage, which can significantly improve water treatment efficiency, improve effluent water quality and reduce floor space.

[0040] In a preferred embodiment, the nano-catalytic ceramic membrane in the catalytic ceramic membrane assembly C comprises a ceramic membrane (including but not limited to a conventional granular-stacked ceramic membrane or a novel ceramic fiber membrane, with a pore size of 20-100 nm) and a highly catalytically active transition metal oxide catalyst supported on the ceramic membrane, including but not limited to conventional mono-transition metal oxides (Mn2O3, MnO2, Fe3O4, CuO, etc.), binary transition metal oxides (CuMnO, ZnMnO, FeMnO, etc.), and ternary transition metal oxides (CuFeMnO, CuZnMnO, TiFeMnO, etc.). The catalytic membrane can efficiently catalyze oxidants (including but not limited to ozone and hydrogen peroxide) to produce reactive oxygen species, enhancing the removal of organic pollutants and exhibiting strong anti-pollution properties.

[0041] Nano-catalytic ceramic membranes are reinforced with highly catalytically active transition metal oxide catalysts, which effectively enhance the anti-pollution and catalytic activity of the ceramic membrane. During the in-situ oxidation treatment process, they can catalyze advanced oxidation reactions to efficiently enhance the removal of organic pollutants. This can not only more efficiently control membrane pollution, but also enhance the removal of difficult-to-degrade organic pollutants represented by new pollutants, and can significantly improve the effluent water quality and operational stability of sewage treatment plants.

[0042] like Figure 1 As shown, the pool body is a square pool body surrounded by the opposite first side 11 and second side 12 and the opposite third side 13 and fourth side 14; there are 9 partitions, namely the first to the ninth partitions.

[0043] The first baffle 21 is arranged in the middle of the pool body (preferably in the center of the pool body), and there is a gap 211 between the first end of the first baffle 21 and the first side 11. The gap 211 serves as the entrance for water from the first anoxic zone 1 to flow to the second anoxic zone 2. There is a gap 212 between the second end of the first baffle 21 and the second side 12. The gap 212 serves as the entrance for water from the first aerobic zone to flow to the second aerobic zone.

[0044] The first ends of the second partition 22 and the fourth partition 24 are respectively connected to the first partition 21 and close to the first end of the first partition 21. There is a gap 221 between the second end of the second partition 22 and the third side 13. The gap 221 serves as the entrance for the water in the third internal recirculation zone 10 to flow to the first combined oxygen zone 1. There is a gap 241 between the second end of the fourth partition 24 and the fourth side 14. The gap 241 serves as the entrance for the water in the second combined oxygen zone 2 to flow to the third combined oxygen zone.

[0045] The first ends of the third barrier 23 and the fifth barrier 25 are connected to the first barrier 21 and close to the second end of the first barrier 21. A gap 231 is defined between the second end of the third barrier 23 and the third side 13. The gap 231 serves as an inlet for water from the first internal recirculation zone 8 to flow toward the second internal recirculation zone 9. A gap 251 is defined between the second end of the fifth barrier 25 and the fourth side 14. The gap 251 serves as an inlet for water from the first micro-oxygen zone 4 to flow toward the second micro-oxygen zone 5.

[0046] The sixth partition 26 is located between the second partition 22 and the third partition 23, and the first end of the sixth partition 26 is connected to the third side 13. There is a gap 261 between the second end of the sixth partition 26 and the first partition 21. The gap 261 serves as an entrance for water from the second internal recirculation zone to flow to the third internal recirculation zone.

[0047] The seventh partition 27 is located between the fourth partition 24 and the fifth partition 25, and the first end of the seventh partition 27 is connected to the fourth side 14. There is a gap 271 between the second end of the seventh partition 27 and the first partition 21. The gap 271 serves as an inlet for water from the third aerobic zone 3 to flow to the first micro-aerobic zone 4.

[0048] The eighth partition 28 is located between the third partition 23 and the second end of the first partition 21, and the first end of the eighth partition 28 is connected to the third side 13. There is a gap 281 between the second end of the eighth partition 28 and the first partition 21. The gap 281 serves as an entrance for water from the second aerobic zone 7 to flow to the first internal recirculation zone 8.

[0049] The ninth partition 29 is located between the fifth partition 25 and the second end of the first partition 21, and the first end of the ninth partition 29 is connected to the fourth side 14. There is a gap 291 between the second end of the ninth partition 29 and the first partition 21. The gap 291 serves as an inlet for water from the second microaerobic zone 5 to flow to the first aerobic zone 6.

[0050] like Figure 1 As shown, the first partition 21 is parallel to the third side 13 and the fourth side 14 of the pool body; the second partition 21 and the fourth partition 24 are connected to form a straight line perpendicular to the first partition 21 and parallel to the first side 11 and the second side 12 of the pool body; the third partition 23 and the fifth partition 25 are connected to form a straight line perpendicular to the first partition 21 and parallel to the first side 11 and the second side 12 of the pool body; the second, third, sixth and eighth partitions are parallel to each other, and the fourth, seventh, fifth and ninth partitions are parallel to each other.

[0051] The pool body is a cuboid, preferably, the first side and the second side of the pool body are the short sides of the cuboid, and the third side and the fourth side of the pool body are the long sides of the cuboid; the distance between the first end of the first baffle 21 and the first side 11 is 15%-20% of the length of the first side of the pool body, the distance between the second end of the first baffle 21 and the second side 12 is 10%-15% of the length of the first side of the pool body; the distance between the second end of the second baffle 22 and the third side 13, the distance between the second end of the fourth baffle 24 and the fourth side 14 is 10%-15% of the length of the first side of the pool body; The spacing distance, the spacing distance between the second end of the third partition 23 and the third side 13, the spacing distance between the second end of the fifth partition 25 and the fourth side 14, the spacing distance between the second end of the sixth partition 26 and the first partition 21, the spacing distance between the second end of the seventh partition 27 and the first partition 21, the spacing distance between the second end of the eighth partition 28 and the first partition 21, and the spacing distance between the second end of the ninth partition 29 and the first partition 21 are each independently 5%-10% of the length of the first side 11 of the pool body.

[0052] In a preferred embodiment, through the separation of the baffles, the total volume of the three facultative aerobic zones>the total volume of the two aerobic zones>the volume of the first microaerobic zone>the volume of the second microaerobic zone. More preferably, the ratio of the total volume of the three facultative aerobic zones, the volume of the first microaerobic zone, the volume of the second microaerobic zone, and the total volume of the two aerobic zones is 10:4:3:7.

[0053] like Figure 1 As shown, there are 18 guide baffles, namely the 1st to the 18th guide baffles, all of which are parallel to the first partition 21.

[0054] The first guide baffle 31 and the eighteenth guide baffle 318 are located in the first anoxic zone 1, the first guide baffle 31 is connected to the first side 11 of the pool body, the eighteenth guide baffle 318 is connected to the second partition 22, and the first guide baffle 31 is close to the "entrance of the water flow from the first anoxic zone to the second anoxic zone" (i.e., close to the interval 211), and the eighteenth partition 318 is close to the "entrance of the water flow from the third internal recirculation zone to the first anoxic zone" (i.e., close to the interval 221).

[0055] The second guide baffle 32 and the third guide baffle 33 are located in the second anoxic zone 2, the second guide baffle 32 is connected to the first side 11 of the pool body, the third guide baffle 33 is connected to the fourth partition 24, and the second guide baffle 32 is close to the "entrance of the water from the first anoxic zone to the second anoxic zone" (i.e., close to the interval 211), and the third guide baffle 33 is close to the "entrance of the water from the second anoxic zone to the third anoxic zone" (i.e., close to the interval 241).

[0056] The 4th guide baffle 34 and the 5th guide baffle 35 are located in the third combined oxygen zone 3, the 4th guide baffle 34 is connected to the fourth partition 24, the 5th guide baffle 35 is connected to the seventh partition 27, and the 4th guide baffle 34 is close to the "entrance of the water flow from the second combined oxygen zone to the third combined oxygen zone" (i.e., close to the interval 241), and the 5th guide baffle 35 is close to the "entrance of the water flow from the third combined oxygen zone to the first micro-aerobic zone" (i.e., close to the interval 271).

[0057] The sixth guide baffle 36 and the seventh guide baffle 37 are located in the first micro-oxygen zone 4. The sixth guide baffle 36 is connected to the seventh partition 27, and the seventh guide baffle 37 is connected to the fifth partition 25. The sixth guide baffle 36 is close to the "entrance of water flowing from the third facultative aerobic zone to the first micro-oxygen zone" (i.e., close to the interval 271), and the seventh guide baffle 37 is close to the "entrance of water flowing from the first micro-oxygen zone to the second micro-oxygen zone" (i.e., close to the interval 251).

[0058] The eighth guide baffle 38 and the ninth guide baffle 39 are located in the second micro-aerobic zone 5. The eighth guide baffle 38 is connected to the fifth partition 25, and the ninth guide baffle 39 is connected to the ninth partition 29. The eighth guide baffle 38 is close to the "entrance of water from the first micro-aerobic zone to the second micro-aerobic zone" (i.e., close to the interval 251), and the ninth guide baffle 39 is close to the "entrance of water from the second micro-aerobic zone to the first aerobic zone" (i.e., close to the interval 291).

[0059] The tenth guide baffle 310 is located in the first aerobic zone 6, is connected to the ninth partition 29, and is close to the "entrance of the water from the second microaerobic zone to the first aerobic zone" (ie, close to the interval 291).

[0060] The 11th flow baffle 311 is located in the second aerobic zone 7, is connected to the eighth baffle 28, and is close to the "entrance of water from the second aerobic zone to the first internal recirculation zone" (i.e., close to the interval 281).

[0061] The 12th guide baffle 312 and the 13th guide baffle 313 are located in the first internal recirculation zone 8. The 12th guide baffle 312 is connected to the eighth partition 28, and the 13th guide baffle 313 is connected to the third partition 23. The 12th guide baffle 312 is close to the "entrance of the water flowing from the second aerobic zone to the first internal recirculation zone" (i.e., close to the interval 281), and the 13th guide baffle is close to the "entrance of the water flowing from the first internal recirculation zone to the second internal recirculation zone" (i.e., close to the interval 231).

[0062] The 14th guide baffle 314 and the 15th guide baffle 315 are located in the second internal recirculation zone 9, the 14th guide baffle 314 is connected to the third baffle 23, the 15th guide baffle 315 is connected to the sixth baffle 26, and the 14th guide baffle 314 is close to the "entrance of water flowing from the first internal recirculation zone to the second internal recirculation zone" (i.e., close to the interval 231), and the 15th guide baffle 315 is close to the "entrance of water flowing from the second internal recirculation zone to the third internal recirculation zone" (i.e., close to the interval 261).

[0063] The 16th guide baffle 316 and the 17th guide baffle 317 are located in the third internal recirculation zone 10, the 16th guide baffle 316 is connected to the sixth baffle 26, the 17th guide baffle 317 is connected to the second baffle 22, and the 16th guide baffle 316 is close to the "entrance of water flowing from the second internal recirculation zone to the third internal recirculation zone" (i.e., close to the interval 261), and the 17th guide baffle 317 is close to the "entrance of water flowing from the third internal recirculation zone to the first aeration zone" (i.e., close to the interval 221).

[0064] The 3rd guide baffle 33 and the 4th guide baffle 34 are connected to form a line directly perpendicular to the fourth partition 24; the 5th and 6th guide baffles 35 and 36 are connected to form a line directly perpendicular to the seventh partition 27; the 7th and 8th guide baffles 37 and 38 are connected to form a line directly perpendicular to the fifth partition 25; the 9th and 10th guide baffles 39 and 310 are connected to form a line directly perpendicular to the ninth partition 29; the 11th and 12th guide baffles 211 and 312 are connected to form a line directly perpendicular to the eighth partition 28; the 13th and 14th guide baffles 313 and 314 are connected to form a line directly perpendicular to the third partition 23, and the 15th and 16th guide baffles 315 and 316 are connected to form a line directly perpendicular to the sixth partition 26; the 17th and 18th guide baffles 317 and 318 are connected to form a line directly perpendicular to the second partition 22.

[0065] The length of each guide baffle is 25%-30% of the length of the first side of the pool body; the 1st, 11th, 12th, 15th, 16th, 2nd, 5th, 6th, 9th, and 10th guide baffles are all parallel to the first baffle 21, and the parallel distance is 25% to 30% of the length of the first side of the pool body; the 3rd, 4th, 7th, 8th, 13th, 14th, 17th, and 18th guide baffles are all parallel to the first baffle 21, and the parallel distance is 70% to 75% of the length of the first side of the pool body.

[0066] The sewage treatment device also includes a first air aeration pump 41, a first valve 61, a first flowmeter F1, a first pipe 51, a second air aeration pump 42, a second valve 62, a second flowmeter F2, a second pipe 52, an ozone generator 43, a third valve 63, a third flowmeter F3, a third pipe 53, a third air aeration pump 44, a fourth pipe 58, a fourth flowmeter F8, and a fourth valve 67.

[0067] The aeration device in the first anoxic zone 1 is a first air aeration device 71 (such as an aeration rod). The first air aeration pump 41 located outside the tank body is connected to the first air aeration device 71 through a first valve 61 and a first pipe 51. The first flowmeter F1 is connected to the first pipe 51.

[0068] The aeration device in the second aerobic zone 7 is a second air aeration device 72 . The second air aeration pump 42 outside the tank body is connected to the second air aeration device 72 through a second valve 62 and a second pipe 52 . The second flow meter F2 is connected to the second pipe 52 .

[0069] The aeration devices in the membrane pool 200 are an ozone aeration device 73 and a third air aeration device 74. The ozone generator 43 located outside the membrane pool 200 is connected to the ozone aeration device 73 through a third valve 63 and a third pipe 53. The third flowmeter F3 is connected to the third pipe 53. The third air aeration pump 44 located outside the membrane pool 200 is connected to the third air aeration device 74 through a fourth valve 67 and a fourth pipe 58. The fourth flowmeter F8 is connected to the fourth pipe 58.

[0070] The sewage treatment device also includes an inlet pump 44, an inlet valve 64, an inlet flow meter F4, an inlet pipe 54, a clean water tank 81, a membrane tank outlet pump 45, a membrane tank outlet pipe 55, an outlet flow meter F5, a pressure gauge P, a clean water backwash pump 45, a clean water backwash valve 65, a clean water backwash pipe 56, a clean water backwash flow meter F6, a chemical tank 82, a chemical backwash pump 46, a chemical backwash valve 66, a chemical backwash pipe 57, a chemical flow meter F7, a sedimentation tank inlet valve 613, a sedimentation tank inlet Pipe 512, sedimentation tank outlet valve 614, sedimentation tank outlet pipe 513, sedimentation tank outlet flowmeter F9, outlet valve 68, outlet pipe 59, fifth valve 69, fifth pipe 510, sludge pump 47, sludge pipe 511, first sludge valve 610, second sludge valve 611, sixth valve 612, biological activated carbon filter outlet pump 43, biological activated carbon filter cleaning pump 48, biological activated carbon filter outlet flowmeter F10, biological activated carbon filter cleaning flowmeter F11.

[0071] The sewage to be treated enters the water inlet of the first anoxic zone 1 via the water inlet valve 64 and the water inlet pump 44 through the water inlet pipe 54 , and the water inlet flowmeter F4 is connected to the water inlet pipe 54 .

[0072] The first outlet of the second aerobic zone 7 is connected to the sedimentation tank 100 via the sedimentation tank inlet valve 613 and the sedimentation tank inlet pipe 512; the outlet water of the sedimentation tank 100 is connected to the membrane tank 200 via the sedimentation tank outlet valve 614 and the sedimentation tank outlet pipe 513, and the sedimentation tank outlet flowmeter F9 is connected to the sedimentation tank outlet pipe 513.

[0073] The third water outlet of the membrane pool 200 is connected to the biological activated carbon filter 300 via the membrane pool outlet pump 45 and the sixth valve 612 through the membrane pool outlet pipe 55. The pressure gauge P and the outlet flow meter F5 are both connected to the membrane pool outlet pipe 55.

[0074] The outlet water of the biological activated carbon filter 300 is connected to the clean water tank 81 through the outlet valve 68 and the biological activated carbon filter outlet pump 43 through the outlet pipe 59, and the biological activated carbon filter outlet flowmeter F10 is connected to the outlet pipe 59. The clean water tank 81 is connected to the catalytic ceramic membrane assembly C through the clean water backwash valve 65 and the clean water backwash pump 45 through the clean water backwash pipe 56, and the clean water backwash flowmeter F6 is connected to the clean water backwash pipe 56. The clean water tank 81 is also connected to the biological activated carbon filter 300 through the fifth valve 69 and the biological activated carbon filter cleaning pump 48 through the fifth pipe 510, and the biological activated carbon filter cleaning flowmeter F11 is connected to the fifth pipe 510. When the biological activated carbon filter is seriously polluted, the clean water in the clean water tank 81 can be used to backwash the biological activated carbon filter.

[0075] The inlet of the biological activated carbon filter 300 is below the biological activated carbon filter 300 , and the outlet is above the biological activated carbon filter 300 . The hydraulic retention time of the biological activated carbon filter 300 is 15-45 minutes.

[0076] The reagent pool 82 is connected to the catalytic ceramic membrane assembly C via a reagent backwash valve 66 and a reagent backwash pump 46 through a reagent backwash pipe 57 , and a reagent flowmeter F7 is connected to the reagent backwash pipe 57 .

[0077] The first mud discharge port of the sedimentation tank 100 is connected to the first anoxic zone 1 via a first mud discharge valve 610 and a mud discharge pump 47 through a mud discharge pipe 511, and the second mud discharge port of the membrane tank 200 is connected to the first anoxic zone 1 via a second mud discharge valve 611 and a mud discharge pump 47 through a mud discharge pipe 511.

[0078] Further references Figure 3, the present invention can also regulate the operation of the sewage treatment device through intelligent automatic control. The sewage treatment device also includes a control system, which includes a data online monitoring and acquisition unit, a data offline monitoring and acquisition unit, a data intelligent processing and analysis unit, and a control unit. The data online monitoring and acquisition unit and the data offline monitoring and acquisition unit are both connected to the data intelligent processing and analysis unit, and the data intelligent processing and analysis unit is connected to the control unit; the data online monitoring and acquisition unit is respectively connected to each comprehensive detector in each zone, each flow meter (including a first flow meter, a second flow meter, a third flow meter, an inlet flow meter, an outlet flow meter, a clean water backwash flow meter, a chemical flow meter, a fourth flow meter, a sedimentation tank outlet flow meter), and a pressure gauge to collect, monitor and collect their data (for example, real-time collection can be performed every 1 minute). The data is transmitted synchronously to the data intelligent processing and analysis unit); the data offline monitoring and collection unit is used to collect water sample indicators of the water inlet, the first facultative aerobic zone, the second facultative aerobic zone, the third facultative aerobic zone, the first microaerobic zone, the second microaerobic zone, the first aerobic zone, the second aerobic zone, the first internal recirculation zone, the second internal recirculation zone, the third internal recirculation zone, the membrane pool, and each water outlet (including the water outlet of the second aerobic zone, the water outlet of the sedimentation tank, the water outlet of the membrane pool, the water outlet of the biological activated carbon filter, etc.); for example, the data offline monitoring and collection unit collects water samples at the water inlet, the first facultative aerobic zone, the second facultative aerobic zone, the third facultative aerobic zone, the first microaerobic zone, the second microaerobic zone, the first aerobic zone, the second aerobic zone, the first internal recirculation zone, the second internal recirculation zone, the third internal recirculation zone, the membrane pool, and each water outlet at a fixed time every day, including but not limited to total nitrogen, ammonia nitrogen, total phosphorus, COD cr , new pollutants, sludge concentration, sludge settling performance and other water quality indicators for subsequent analysis; the data intelligent processing and analysis unit is used to perform intelligent analysis and make intelligent decisions based on the data collected by the data online monitoring and acquisition unit and the data offline monitoring and acquisition unit; the control unit is respectively connected with the flow pushers in each zone, each pump (including the first air aeration pump, the second air aeration pump, the third air aeration pump, the water inlet pump, the membrane pool outlet pump, the clean water backwash pump, the chemical backwash pump, the sludge pump, the biological activated carbon filter outlet pump, the biological activated carbon filter cleaning pump), each valve (including the first valve, the second valve, the third valve, the water inlet valve, the clean water backwash valve, the chemical backwash valve, the fourth valve, the water outlet valve, the fifth valve, the first mud discharge valve, the second mud discharge valve), the ozone generator, and the flow meters (including the first flow meter, the second flow meter, the third flow meter, the water inlet flow meter, the water outlet flow meter, the clean water backwash flow meter, the chemical flow meter, the fourth flow meter, the sedimentation tank outlet flow meter, the biological activated carbon filter outlet flow meter, and the biological activated carbon filter cleaning flow meter) are connected and used to control them according to the intelligent decision made by the data intelligent processing and analysis unit.

[0079] Through the control system, the present invention can more accurately control the DO and ORP of each zone of the biological reactor of the sewage treatment device to achieve precise control of short-range nitrification and denitrification and anaerobic ammonium oxidation, thereby achieving the goal of efficient nitrogen and phosphorus removal and reducing residual sludge without adding additional carbon sources.

[0080] The present invention also provides a sewage treatment method, comprising the following steps:

[0081] (1) After the sewage to be treated enters the facultative aerobic zone from the water inlet, it passes through the facultative aerobic zone and the microaerobic zone in sequence along the first water flow path under the driving action of each flow propeller, and enters the aerobic zone;

[0082] (2) In the aerobic zone, a portion of the sewage is discharged from the first outlet to the sedimentation tank, and the other portion of the sewage flows along the second water path through the internal recirculation zone into the facultative aerobic zone for internal circulation;

[0083] (3) The sewage coming out of the first outlet is treated in the sedimentation tank, membrane tank and biological activated carbon filter tank in turn before being discharged.

[0084] In a preferred embodiment, it uses Figure 1 The sewage treatment device shown comprises the following steps:

[0085] (1) After the sewage to be treated enters the first aerobic zone from the water inlet, under the driving action of each flow propeller and the guidance of the guide baffle, it forms an S-shaped water flow path and passes through the first aerobic zone, the second aerobic zone, the third aerobic zone, the first microaerobic zone, the second microaerobic zone and the first aerobic zone in sequence, and enters the second aerobic zone;

[0086] (2) In the second aerobic zone, part of the sewage is discharged from the first water outlet to the sedimentation tank, and the other part of the sewage is driven by the flow propellers and guided by the guide baffles, and in an S-shaped water flow path, it passes through the first internal recirculation zone, the second internal recirculation zone and the third internal recirculation zone in sequence and enters the first facultative aerobic zone for internal circulation;

[0087] (3) The sewage coming out of the first outlet is treated in the sedimentation tank, membrane tank and biological activated carbon filter tank in turn before being discharged.

[0088] In the above treatment process, the wastewater first undergoes facultative aerobic treatment to partially oxidize the pollutants' ammonia and nitrogen, then undergoes two micro-aerobic treatments to achieve short-term nitrification and denitrification, followed by anaerobic ammonium oxidation denitrification. Aerobic treatment then removes remaining organic matter, and sludge and water separation is achieved in a sedimentation tank. The sludge mixture is then recycled to the facultative aerobic zone, serving as a supplemental carbon source and reducing sludge treatment and disposal costs. The effluent from the first outlet of the second aerobic zone then undergoes further treatment, including sedimentation in a sedimentation tank, catalytic ozone oxidation in a membrane tank, ceramic membrane filtration, and biological activated carbon filtration, to remove trace amounts of new pollutants from the wastewater.

[0089] In some preferred embodiments, at least one of the following conditions is also met:

[0090] The dissolved oxygen (DO) in the first, second and third facultative oxygen zones is independently 0.5-1.0 mg / L, and the ORP (Oxidation-Reduction Potential) is independently 50-100 mV. The dissolved oxygen in the first, second and third facultative oxygen zones decreases in sequence, and the ORP in the first, second and third facultative oxygen zones decreases in sequence.

[0091] The dissolved oxygen in the first micro-oxygen zone is 0.2-0.5 mg / L, and the ORP is -100-50 mV.

[0092] The dissolved oxygen in the second micro-oxygen zone is below 0.2 mg / L, and the ORP is -300 to -100 mV.

[0093] The dissolved oxygen in the first aerobic zone and the second aerobic zone is ≥2 mg / L, and the ORP is ≥100 mV.

[0094] The total residence time of sewage in the first facultative aerobic zone, the second facultative aerobic zone and the third facultative aerobic zone is 5-10 hours, the residence time in the first microaerobic zone is 2-4 hours, the residence time in the second microaerobic zone is 1.5-3 hours, and the total residence time in the first aerobic zone and the second aerobic zone is 3.5-7 hours.

[0095] The biological activated carbon filter has water inlet at the lower end and water outlet at the upper end, and the hydraulic retention time of the biological activated carbon filter is 15-45 minutes.

[0096] Through aeration, the air-water volume ratio in the first facultative oxic zone, the second facultative oxic zone and the third facultative oxic zone is 3:1-6:1, and the air-water volume ratio in the first aerobic zone and the second aerobic zone is 5:1-15:1.

[0097] The intermittent operation of the flow propeller is controlled to control the push-stop time ratio of the first micro-oxygen zone, the second micro-oxygen zone and the internal reflux zone. The push-flow and stop-flow times are 180 minutes and 60 minutes respectively, and the push-stop ratio is 3:1.

[0098] Continuous in-situ ozone aeration is carried out in the membrane pool, and the in-situ ozone dosage is 2-10 mg / L.

[0099] The catalytic ceramic membrane assembly operates in a constant flux dead-end filtration mode, and the membrane filtration flux is controlled at 60-120 L / m 2 h, the pumping-on / off ratio is 8-15min:1-2min, and the air-water ratio of the aeration intensity in the membrane pool is controlled at 4:1-9:1.

[0100] The catalytic ceramic membrane assembly is backwashed with clean water online once every 12 hours. The backwash membrane flux is twice the membrane filtration flux and the backwash time is 10-30 minutes. The catalytic ceramic membrane assembly is backwashed with chemicals online once a week. The backwash membrane flux is twice the membrane filtration flux and the backwash time is 10-30 minutes. The offline chemical reaction time is 10-30 minutes.

[0101] The reagent for weekly online backwashing is a low-concentration hydrogen peroxide solution with a concentration of 1-10mM. The reagent for offline cleaning of contaminated catalytic ceramic membrane modules is preferably a high-concentration hydrogen peroxide solution with a concentration of 200-1000mM.

[0102] The TMP (Transmembrane Pressure) of the catalytic ceramic membrane assembly is monitored in real time. When the TMP exceeds 35 kPa, water treatment is suspended and the catalytic ceramic membrane assembly is cleaned offline with chemicals until the TMP recovery rate reaches more than 99%.

[0103] Specific embodiments of the present invention are further described below.

[0104] Example 1

[0105] This embodiment adopts Figure 1 The sewage treatment device shown in FIG. 1 (the ratio of the total volume of the three facultative aerobic zones, the volume of the first microaerobic zone, the volume of the second microaerobic zone, the total volume of the first aerobic zone and the second aerobic zone is 10:4:3:7) is shown in FIG. Figure 2 As shown, the nano-catalytic ceramic membrane in catalytic ceramic membrane assembly C is a manganese-doped ceramic membrane with 2 wt% Mn2O3, and has an average pore size of 100 nm. During operation, the wastewater treatment plant uses a control system to precisely regulate the DO and ORP levels in each bioreactor zone, achieving efficient nitrogen and phosphorus removal and excess sludge reduction without the addition of an additional carbon source. The specific steps are as follows:

[0106] (1) The sewage enters the first facultative aerobic zone through the water inlet pump, and the reflux mixed liquid from the second aerobic zone flows back to the first facultative aerobic zone. The air aeration pump, air gas flow meter and aeration device are coordinated to control the mixed liquid in the first facultative aerobic zone to be aerated, and the air-water ratio (volume ratio) is 3:1-6:1. Then the sewage enters the second facultative aerobic zone, the third facultative aerobic zone, the first microaerobic zone, the second microaerobic zone, the first aerobic zone and the second aerobic zone in sequence. Among them, the first microaerobic zone, the second microaerobic zone and the first aerobic zone are not aerated, and the second aerobic zone is aerated. The dissolved oxygen content in the facultative aerobic zone, the first microaerobic zone, the second microaerobic zone and the aerobic zone is controlled at 0.5-1.0 mg / L, 0.2-0.5 mg / L, ≤0.2 mg / L and ≥2.0 mg / L, respectively.

[0107] (2) The redox potential detection probe detects the ORP of each reaction zone, and controls the ORP of the facultative aerobic zone, the first microaerobic zone, the second microaerobic zone, and the aerobic zone to be 50-100 mV, -100-50 mV, -300--100 mV, and ≥100 mV, respectively.

[0108] (3) The hydraulic retention time of the facultative aerobic zone, the first microaerobic zone, the second microaerobic zone and the aerobic zone are controlled to be 5h, 2h, 1.5h and 3.5h respectively.

[0109] (4) The remaining sludge in the sedimentation tank is discharged through the sludge discharge valve and returned to the aerobic zone through the sludge discharge pump to control the sludge concentration in the biological reaction tank at 7-10g / L.

[0110] (5) The effluent from the sedimentation tank enters the membrane tank and is fully contacted with ozone before being filtered through the membrane. The membrane flux is 60-120LMH.

[0111] (6) The ozone dosage in the membrane pool is controlled at 2-10 mg / L.

[0112] (7) The effluent from the membrane pool is then filtered through a biological activated carbon filter, and the hydraulic retention time of the biological activated carbon filter is 15-45 minutes.

[0113] Example 2

[0114] Applying the sewage treatment process and device described in Example 1 to actual domestic sewage treatment can effectively remove carbon, nitrogen and phosphorus pollutants in the inlet and outlet water.

[0115] Table 1 shows the changes in pollutant concentrations in different treatment sections of a sewage treatment plant.

[0116] Table 1

[0117]

[0118] In terms of conventional indicators, COD CrThe 200 mg / L influent from the biological reactor was reduced to 11.96 mg / L in the effluent from the biological reactor, and then further reduced to less than 10 mg / L in the effluent from the membrane tank. Finally, the effluent from the biological activated carbon filter was maintained at less than 10 mg / L, with a removal rate of 95%, indicating that the sewage treatment device and method have significant effects on the removal of organic matter, which is mainly due to the biodegradation effect of the biological reactor, the oxidation effect of the membrane tank and the adsorption effect of the biological activated carbon filter.

[0119] The TN concentration decreased from 40 mg / L in the inlet of the biological reactor to 8.95 mg / L in the effluent of the biological reactor, to less than 10 mg / L in the effluent of the membrane tank, and finally to 5.5 mg / L in the effluent of the biological activated carbon filter, with a removal rate of 86.2%. This was attributed to the conversion and removal of nitrogen by the nitrification and denitrification processes in the biological reactor, and the further oxidation, adsorption and biological absorption of the remaining nitrogen in the subsequent membrane tank and biological activated carbon filter.

[0120] The removal effect of ammonia nitrogen can also be well guaranteed. It dropped significantly from 40 mg / L in the influent of the biological reactor to 0.24 mg / L in the effluent of the biological reactor. Then it rose slightly to 0.45 mg / L in the effluent of the membrane pool, and finally dropped to 0.1 mg / L in the effluent of the biological activated carbon filter. The removal rate was as high as 99.8%, thanks to the action of nitrifying bacteria in the biological reactor and the deep treatment of the subsequent process.

[0121] The TP concentration dropped from 2 mg / L in the influent of the biological reactor to 0.15 mg / L in the effluent of the biological reactor, and then dropped to 0.05 mg / L after treatment in the membrane pool. It finally reached 0.01 mg / L in the effluent of the biological activated carbon filter, with a removal rate of 99.6%, indicating that the combined process effectively removes phosphorus from wastewater through multiple mechanisms such as biological phosphorus removal, chemical precipitation and adsorption.

[0122] In terms of turbidity, the turbidity of the effluent from the biological reactor was 2.25 NTU, which was reduced to 0.28 NTU after treatment in the membrane tank, and finally further reduced to 0.19 NTU in the effluent from the biological activated carbon filter. This shows that the sewage treatment device and method of the present invention have a good removal effect on suspended matter and colloidal substances, mainly relying on the interception of the ceramic membrane and the adsorption effect of the biological activated carbon filter.

[0123] Example 3

[0124] Applying the sewage treatment process and device described in Example 1 to actual hospital sewage treatment can efficiently remove trace new pollutants in the inlet and outlet water.

[0125] Table 2 shows the removal efficiency of clarithromycin, erythromycin, sulfamethoxazole, ciprofloxacin, tetracycline, ofloxacin, and paracetamol, typical trace new pollutants in hospital wastewater. Their concentrations gradually decreased from 50 μg / L in the bioreactor influent through each treatment stage, ultimately reaching a low of no more than 0.1 μg / L in the effluent from the biological activated carbon filter. This achieved a removal efficiency exceeding 99.8%. This is primarily due to the enhanced removal of new pollutants in the water by catalytic ozone oxidation using the catalytic ceramic membrane in the membrane tank, as well as the further adsorption and microbial degradation of new pollutants by the biological activated carbon in the biological activated carbon filter. This effectively removes trace organic new pollutants from wastewater, ensuring safe effluent quality.

[0126] Table 2

[0127]

[0128] In summary, the present invention has an excellent removal effect on both conventional pollutants and trace new pollutants in sewage, and achieves the effect of sludge reduction without the need for additional carbon source addition.

[0129] The above description further details the present invention in conjunction with specific / preferred embodiments, and the specific implementation of the present invention should not be construed as being limited to these descriptions. Persons skilled in the art will appreciate that, without departing from the spirit of the present invention, they may make various substitutions or modifications to the described embodiments, and these substitutions or modifications should be considered to fall within the scope of protection of the present invention. Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "preferred embodiments," "examples," "specific examples," or "some examples" indicates that the specific features, structures, materials, or characteristics described in conjunction with such embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Persons skilled in the art may combine and assemble the different embodiments or examples described in this specification, as well as features of different embodiments or examples, without conflicting opinions. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and modifications may be made herein without departing from the scope of protection of the patent application.

Claims

1. A sewage treatment device, characterized in that: It includes a biological reaction tank, a sedimentation tank, a membrane tank and a biological activated carbon filter; the biological reaction tank includes a tank body, the interior of the tank body is separated by multiple partitions into interconnected facultative oxic zone, microaerobic zone, aerobic zone and internal recirculation zone; each zone is equipped with a comprehensive detector and a flow pusher, and the facultative oxic zone and the aerobic zone are equipped with an aeration device; the first water outlet of the aerobic zone is connected to the sedimentation tank, the sedimentation tank has a second water outlet and a first mud outlet, the second water outlet is connected to the membrane tank, the membrane tank has a catalytic ceramic membrane assembly and an aeration device, the membrane tank has a third water outlet and a second mud outlet, and the third water outlet is connected to the biological activated carbon filter; The sewage to be treated passes through the facultative aerobic zone and the microaerobic zone in sequence along the first water flow path and enters the aerobic zone; a portion of the water in the aerobic zone passes through the internal recirculation zone along the second water flow path and enters the facultative aerobic zone for internal circulation; the other portion of the water is discharged from the first water outlet, passes through the sedimentation tank, the membrane tank and the biological activated carbon filter in sequence for treatment, and is then discharged from the biological activated carbon filter; Among them, the comprehensive detectors in each zone of the biological reaction tank include a dissolved oxygen detection probe and an oxidation-reduction potential detection probe, which are respectively used to detect the dissolved oxygen and oxidation-reduction potential in the corresponding zone. A guide baffle for extending the water flow path is also provided in each zone. The first water flow path and the second water flow path are both S-shaped. The dissolved oxygen and oxidation-reduction potential in each zone are within a predetermined range.

2. The sewage treatment device according to claim 1, characterized in that: There are 1-3 facultative aerobic zones, 1-2 microaerobic zones, 1-3 aerobic zones, and 1-3 internal recirculation zones; preferably, the interior of the bioreactor body is separated by multiple partitions into the following 10 interconnected zones: The first facultative oxygen zone has a water inlet, a comprehensive detector, a flow pusher and an aeration device; The second oxygen-assisted zone is equipped with a comprehensive detector and a flow pusher; The third oxygenation zone is equipped with a comprehensive detector and a flow pusher; The first micro-aerobic zone has a comprehensive detector and a flow pusher; The second micro-oxygen zone has a comprehensive detector and a flow pusher; The first aerobic zone has a comprehensive detector and a flow pusher; The second aerobic zone has a comprehensive detector, a first water outlet, and an aeration device; The first internal reflux zone has a comprehensive detector and a flow pusher; The second internal reflux zone has a comprehensive detector and a flow pusher; as well as The third internal reflux zone has a comprehensive detector and a flow pusher; The first water outlet of the second aerobic zone is connected to the sedimentation tank, the sedimentation tank has a second water outlet and a first mud outlet, and the second water outlet is connected to the membrane tank; The membrane pool is provided with a catalytic ceramic membrane assembly and an aeration device, and the membrane pool is provided with a third water outlet and a second mud outlet, and the third water outlet is connected to the biological activated carbon filter; After the sewage to be treated enters the first facultative aerobic zone of the biological reaction tank from the water inlet, it passes through the first facultative aerobic zone, the second facultative aerobic zone, the third facultative aerobic zone, the first microaerobic zone, the second microaerobic zone and the first aerobic zone in sequence along the first water flow path, and enters the second aerobic zone; A portion of the water entering the second aerobic zone passes through the first internal recirculation zone, the second internal recirculation zone and the third internal recirculation zone in sequence along the second water flow path and enters the first facultative aerobic zone for internal circulation. The other portion of the water is discharged from the first water outlet and is sequentially treated by the sedimentation tank, the membrane tank and the biological activated carbon filter tank before being discharged from the biological activated carbon filter tank.

3. The sewage treatment device according to claim 2, characterized in that: The pool body is a square pool body surrounded by a first side and a second side opposite to each other and a third side and a fourth side opposite to each other; there are 9 partitions, namely the first to the ninth partitions; A first baffle is provided in the middle of the tank body, with a gap between a first end of the first baffle and the first side, the gap serving as an inlet for water from the first facultative anoxic zone to flow to the second facultative anoxic zone; and a gap between a second end of the first baffle and the second side, the gap serving as an inlet for water from the first aerobic zone to flow to the second aerobic zone. The first ends of the second and fourth partitions are connected to the first partition and close to the first end of the first partition. There is a gap between the second end of the second partition and the third side, and the gap serves as the entrance for water in the third internal recirculation zone to flow to the first anoxic zone. There is a gap between the second end of the fourth partition and the fourth side, and the gap serves as the entrance for water in the second anoxic zone to flow to the third anoxic zone. The first ends of the third and fifth partitions are connected to the first partition and close to the second end of the first partition. There is a gap between the second end of the third partition and the third side, and the gap serves as an inlet for water in the first internal recirculation zone to flow to the second internal recirculation zone. There is a gap between the second end of the fifth partition and the fourth side, and the gap serves as an inlet for water in the first micro-oxygen zone to flow to the second micro-oxygen zone. The sixth partition is located between the second partition and the third partition, and the first end of the sixth partition is connected to the third side. There is a gap between the second end of the sixth partition and the first partition, and the gap serves as an inlet for water in the second internal recirculation zone to flow to the third internal recirculation zone; The seventh partition is located between the fourth partition and the fifth partition, and the first end of the seventh partition is connected to the fourth side. There is a gap between the second end of the seventh partition and the first partition, and the gap serves as an inlet for water in the third facultative aerobic zone to flow to the first micro-aerobic zone; The eighth partition is located between the third partition and the second end of the first partition, and the first end of the eighth partition is connected to the third side. There is a gap between the second end of the eighth partition and the first partition, and the gap serves as an inlet for water in the second aerobic zone to flow to the first internal recirculation zone; The ninth partition is located between the fifth partition and the second end of the first partition, and the first end of the ninth partition is connected to the fourth side. There is a gap between the second end of the ninth partition and the first partition, and the gap serves as an inlet for water from the second microaerobic zone to flow into the first aerobic zone. Preferably, the first partition is parallel to the third side and the fourth side of the pool body; the second partition and the fourth partition are connected to form a straight line perpendicular to the first partition and parallel to the first side and the second side of the pool body; the third partition and the fifth partition are connected to form a straight line perpendicular to the first partition and parallel to the first side and the second side of the pool body; the second, third, sixth and eighth partitions are parallel to each other, and the fourth, seventh, fifth and ninth partitions are parallel to each other.

4. The sewage treatment device according to claim 3, characterized in that: The pool body is a rectangular parallelepiped; the distance between the first end of the first barrier and the first side is 15%-20% of the length of the first side of the pool body, and the distance between the second end of the first barrier and the second side is 10%-15% of the length of the first side of the pool body; The spacing distance between the second end of the second partition and the third side, the spacing distance between the second end of the fourth partition and the fourth side, the spacing distance between the second end of the third partition and the third side, the spacing distance between the second end of the fifth partition and the fourth side, the spacing distance between the second end of the sixth partition and the first partition, the spacing distance between the second end of the seventh partition and the first partition, the spacing distance between the second end of the eighth partition and the first partition, and the spacing distance between the second end of the ninth partition and the first partition are each independently 5%-10% of the length of the first side of the pool body.

5. The sewage treatment device according to claim 3, characterized in that: There are 18 guide baffles, namely the 1st to 18th guide baffles, all of which are parallel to the first baffle; The first and 18th guide baffles are located in the first anoxic zone, the first guide baffle is connected to the first side of the tank body, the 18th guide baffle is connected to the second baffle, and the first guide baffle is close to the entrance of the first anoxic zone where water flows to the second anoxic zone, and the 18th baffle is close to the entrance of the third internal recirculation zone where water flows to the first anoxic zone; The second and third guide baffles are located in the second anoxic zone, the second guide baffle is connected to the first side of the tank body, and the third guide baffle is connected to the fourth baffle. The second guide baffle is close to the entrance where water from the first anoxic zone flows to the second anoxic zone, and the third guide baffle is close to the entrance where water from the second anoxic zone flows to the third anoxic zone. The fourth and fifth guide baffles are located in the third combined oxygen zone, the fourth guide baffle is connected to the fourth baffle, and the fifth guide baffle is connected to the seventh baffle. The fourth guide baffle is close to the entrance where water from the second combined oxygen zone flows to the third combined oxygen zone, and the fifth guide baffle is close to the entrance where water from the third combined oxygen zone flows to the first micro-aerobic zone. The sixth and seventh guide baffles are located in the first micro-oxygen zone, the sixth guide baffle is connected to the seventh baffle, the seventh guide baffle is connected to the fifth baffle, and the sixth guide baffle is close to the entrance where water from the third facultative oxygen zone flows to the first micro-oxygen zone, and the seventh guide baffle is close to the entrance where water from the first micro-oxygen zone flows to the second micro-oxygen zone; The eighth and ninth guide baffles are located in the second micro-aerobic zone, the eighth guide baffle is connected to the fifth baffle, and the ninth guide baffle is connected to the ninth baffle. The eighth guide baffle is close to the entrance where water from the first micro-aerobic zone flows to the second micro-aerobic zone, and the ninth guide baffle is close to the entrance where water from the second micro-aerobic zone flows to the first aerobic zone. The tenth guide baffle is located in the first aerobic zone, the tenth guide baffle is connected to the ninth baffle, and the tenth guide baffle is close to the entrance of the second microaerobic zone flowing toward the first aerobic zone; The 11th flow baffle is located in the second aerobic zone, the 11th flow guide baffle is connected to the eighth baffle, and the 11th flow guide baffle is close to the entrance of the water flowing from the second aerobic zone to the first internal recirculation zone; The 12th and 13th guide baffles are located in the first internal recirculation zone, the 12th guide baffle is connected to the eighth baffle, and the 13th guide baffle is connected to the third baffle. The 12th guide baffle is close to the entrance of the second aerobic zone flowing into the first internal recirculation zone, and the 13th guide baffle is close to the entrance of the first internal recirculation zone flowing into the second internal recirculation zone. The 14th and 15th guide baffles are located in the second internal recirculation zone, the 14th guide baffle is connected to the third baffle, and the 15th guide baffle is connected to the sixth baffle. The 14th guide baffle is close to the entrance where water from the first internal recirculation zone flows to the second internal recirculation zone, and the 15th guide baffle is close to the entrance where water from the second internal recirculation zone flows to the third internal recirculation zone. The 16th and 17th guide baffles are located in the third internal recirculation zone, the 16th guide baffle is connected to the sixth baffle, the 17th guide baffle is connected to the second baffle, and the 16th guide baffle is close to the "entrance from the second internal recirculation zone to the third internal recirculation zone", and the 17th guide baffle is close to the "entrance from the third internal recirculation zone to the first aeration zone".

6. The sewage treatment device according to claim 5, characterized in that: The 3rd and 4th guide baffles are connected to form a line that is directly perpendicular to the 4th baffle; the 5th and 6th guide baffles are connected to form a line that is directly perpendicular to the 7th baffle; the 7th and 8th guide baffles are connected to form a line that is directly perpendicular to the 5th baffle; the 9th and 10th guide baffles are connected to form a line that is directly perpendicular to the 9th baffle; the 11th and 12th guide baffles are connected to form a line that is directly perpendicular to the 8th baffle; the 13th and 14th guide baffles are connected to form a line that is directly perpendicular to the 3rd baffle; the 15th and 16th guide baffles are connected to form a line that is directly perpendicular to the 6th baffle; the 17th and 18th guide baffles are connected to form a line that is directly perpendicular to the 1 The flow baffles are connected in a line directly perpendicular to the second baffle; preferably, the length of each guide baffle is 25%-30% of the length of the first side of the pool body; the 1st, 11th, 12th, 15th, 16th, 2nd, 5th, 6th, 9th, and 10th guide baffles are all parallel to the first baffle, and the parallel distance is 25% to 30% of the length of the first side of the pool body; the 3rd, 4th, 7th, 8th, 13th, 14th, 17th, and 18th guide baffles are all parallel to the first baffle, and the parallel distance is 70% to 75% of the length of the first side of the pool body.

7. The sewage treatment device according to claim 1, characterized in that: The sewage treatment device further includes a first air aeration pump, a first valve, a first flow meter, a first pipe, a second air aeration pump, a second valve, a second flow meter, a second pipe, an ozone generator, a third valve, a third flow meter and a third pipe, a third air aeration pump, a fourth pipe, a fourth flow meter, and a fourth valve; The aeration device in the first anoxic zone is a first air aeration device, a first air aeration pump located outside the tank body is connected to the first air aeration device through a first valve and a first pipe, and the first flow meter is connected to the first pipe; The aeration device in the second aerobic zone is a second air aeration device, a second air aeration pump located outside the tank body is connected to the second air aeration device through a second valve and a second pipe, and the second flow meter is connected to the second pipe; The aeration device in the membrane pool is an ozone aeration device and a third air aeration device. The ozone generator located outside the membrane pool is connected to the ozone aeration device through a third valve and a third pipe. The third flowmeter is connected to the third pipe. The third air aeration pump located outside the membrane pool is connected to the third air aeration device through a fourth valve and a fourth pipe. The fourth flowmeter is connected to the fourth pipe. The sewage treatment device also includes an inlet pump, an inlet valve, an inlet flowmeter, an inlet pipe, a clean water tank, a membrane tank outlet pump, a membrane tank outlet pipe, an outlet flowmeter, a pressure gauge, a clean water backwash pump, a clean water backwash valve, a clean water backwash pipe, a clean water backwash flowmeter, a chemical tank, a chemical backwash pump, a chemical backwash valve, a chemical backwash pipe, a chemical flowmeter, a sedimentation tank inlet valve, a sedimentation tank inlet pipe, a sedimentation tank outlet valve, a sedimentation tank outlet pipe, a sedimentation tank outlet flowmeter, an outlet valve, an outlet pipe, a fifth valve, a fifth pipe, a mud pump, a mud pipe, a first mud valve, a second mud valve, a sixth valve, a biological activated carbon filter outlet pump, a biological activated carbon filter cleaning pump, a biological activated carbon filter outlet flowmeter, and a biological activated carbon filter cleaning flowmeter; The sewage to be treated enters the water inlet of the first anoxic zone via the water inlet valve and the water inlet pump through the water inlet pipe, and the water inlet flowmeter is connected to the water inlet pipe; The first outlet of the second aerobic zone is connected to the sedimentation tank via the sedimentation tank inlet valve and the sedimentation tank inlet pipe; the outflow of the sedimentation tank is connected to the membrane tank via the sedimentation tank outlet valve and the sedimentation tank outlet pipe, and the sedimentation tank outlet flowmeter is connected to the sedimentation tank outlet pipe; The third water outlet of the membrane pool is connected to the biological activated carbon filter through the membrane pool outlet pump and the sixth valve through the membrane pool outlet pipe, and the pressure gauge and the outlet flow meter are both connected to the membrane pool outlet pipe; The effluent of the biological activated carbon filter is connected to the clean water tank via the outlet valve and the biological activated carbon filter outlet pump through the outlet pipe, the biological activated carbon filter outlet flowmeter is connected to the outlet pipe, the clean water tank is connected to the catalytic ceramic membrane assembly in the membrane tank via the clean water backwash valve and the clean water backwash pump through the clean water backwash pipe, the clean water backwash flowmeter is connected to the clean water backwash pipe, the clean water tank is also connected to the biological activated carbon filter via a fifth valve and the biological activated carbon filter cleaning pump through a fifth pipe, and the biological activated carbon filter cleaning flowmeter is connected to the fifth pipe; The water inlet of the biological activated carbon filter is below the biological activated carbon filter, and the water outlet is above the biological activated carbon filter; The reagent pool is connected to the catalytic ceramic membrane assembly in the membrane pool via a reagent backwash valve and a reagent backwash pump through a reagent backwash pipe, and a reagent flow meter is connected to the reagent backwash pipe; The first mud discharge port of the sedimentation tank is connected to the first anoxic zone via a first mud discharge valve and a mud discharge pump through a mud discharge pipe, and the second mud discharge port of the membrane tank is connected to the first anoxic zone via a second mud discharge valve and a mud discharge pump through a mud discharge pipe.

8. The sewage treatment device according to claim 7, characterized in that: It also includes a control system, which includes an online data monitoring and acquisition unit, an offline data monitoring and acquisition unit, an intelligent data processing and analysis unit, and a control unit. The online data monitoring and acquisition unit and the offline data monitoring and acquisition unit are both connected to the intelligent data processing and analysis unit, and the intelligent data processing and analysis unit is connected to the control unit. The data online monitoring and acquisition unit is respectively connected to each comprehensive detector, the first flow meter, the second flow meter, the third flow meter, the fourth flow meter, the sedimentation tank effluent flow meter, the water inlet flow meter, the effluent flow meter, the pressure gauge, the clean water backwash flow meter, the reagent flow meter, the biological activated carbon filter effluent flow meter, and the biological activated carbon filter cleaning flow meter in each zone to collect, monitor and acquire their data; The data offline monitoring and collection unit is used to collect water sample indicators of the water inlet, the first anoxic zone, the second anoxic zone, the third anoxic zone, the first microaerobic zone, the second microaerobic zone, the first aerobic zone, the second aerobic zone, the first internal reflux zone, the second internal reflux zone, the third internal reflux zone, the membrane pool, and each water outlet respectively; The data intelligent processing and analysis unit is used to perform intelligent analysis and make intelligent decisions based on the data collected by the data online monitoring and collection unit and the data offline monitoring and collection unit; The control unit is respectively connected to the flow pusher, the first air aeration pump, the first valve, the second air aeration pump, the second valve, the ozone generator, the third valve, the third air aeration pump, the fourth valve, the water inlet pump, the water inlet valve, the membrane pool outlet pump, the clean water backwash pump, the clean water backwash valve, the chemical backwash pump, the chemical backwash valve, the outlet valve, the fifth valve, the first mud discharge valve, the second mud discharge valve, the mud discharge pump, the biological activated carbon filter outlet pump, the biological activated carbon filter cleaning pump, the first flow meter, the second flow meter, the third flow meter, the water inlet flow meter, the water outlet flow meter, the clean water backwash flow meter, the chemical flow meter, the fourth flow meter, the sedimentation tank outlet flow meter, the biological activated carbon filter outlet flow meter, and the biological activated carbon filter cleaning flow meter in each zone, and is used to control them according to the intelligent decision made by the data intelligent processing and analysis unit.

9. A sewage treatment method, characterized in that: The method is carried out using the sewage treatment device according to any one of claims 1 to 8, comprising the following steps: (1) After the sewage to be treated enters the facultative aerobic zone from the water inlet, it passes through the facultative aerobic zone and the microaerobic zone in sequence along the first water flow path under the driving action of each flow propeller, and enters the aerobic zone; (2) In the aerobic zone, a portion of the sewage is discharged from the first outlet to the sedimentation tank, and the other portion of the sewage flows along the second water path through the internal recirculation zone into the facultative aerobic zone for internal circulation; (3) The sewage coming out of the first outlet is treated in the sedimentation tank, membrane tank and biological activated carbon filter tank in turn before being discharged.

10. The sewage treatment method according to claim 9, characterized in that: When the membrane bioreactor according to any one of claims 2 to 8 is used for treatment: The dissolved oxygen in the first, second and third facultative oxygen zones is independently 0.5-1.0 mg / L, and the ORP is independently 50-100 mV. The dissolved oxygen in the first, second and third facultative oxygen zones decreases in sequence, and the ORP in the first, second and third facultative oxygen zones decreases in sequence. The dissolved oxygen in the first micro-oxygen zone is 0.2-0.5 mg / L, and the ORP is -100-50 mV; The dissolved oxygen in the second micro-oxygen zone is below 0.2 mg / L, and the ORP is -300 to -100 mV; The dissolved oxygen in the first aerobic zone and the second aerobic zone is ≥2 mg / L, and the ORP is ≥100 mV; The total residence time of sewage in the first facultative aerobic zone, the second facultative aerobic zone, and the third facultative aerobic zone is 5-10 hours, the residence time in the first microaerobic zone is 2-4 hours, the residence time in the second microaerobic zone is 1.5-3 hours, and the total residence time in the first aerobic zone and the second aerobic zone is 3.5-7 hours; The hydraulic retention time of the biological activated carbon filter is 15-45 minutes; By aeration, the air-water volume ratio in the first facultative anoxic zone, the second facultative anoxic zone, and the third facultative anoxic zone is 3:1-6:1, and the air-water volume ratio in the first aerobic zone and the second aerobic zone is 5:1-15:1; The intermittent operation of the flow propeller was controlled to control the push-stop time ratio of the first micro-aerobic zone, the second micro-aerobic zone, and the internal reflux zone. The push-flow and stop-flow times were 180 minutes and 60 minutes, respectively, with a push-stop ratio of 3:

1. The catalytic ceramic membrane components in the membrane pool are operated in a constant flux dead-end filtration mode, and the membrane filtration flux is controlled at 60-120L / m 2 h, the pumping-on / off ratio is 8-15min:1-2min, and the air-water ratio of the aeration intensity in the membrane tank is controlled at 4:1-9:1; Continuous in-situ ozone aeration is carried out in the membrane pool, and the in-situ ozone dosage is 2-10mg / L; The catalytic ceramic membrane assembly is backwashed with clean water online once every 12 hours. The backwashing flux is twice the membrane filtration flux and the backwashing time is 10-30 minutes. The catalytic ceramic membrane assembly is backwashed with chemicals online once a week. The backwashing flux is twice the membrane filtration flux and the backwashing time is 10-30 minutes. The offline chemical reaction time is 10-30 minutes. The TMP of the catalytic ceramic membrane assembly is monitored in real time. When the TMP exceeds 35 kPa, the water inlet and membrane filtration are suspended, and the catalytic ceramic membrane assembly is cleaned offline with chemicals until the TMP recovery rate reaches more than 99%.

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