A device and operating method for coupling denitrification and phosphorus removal

Abstract

The application relates to the technical field of sewage treatment, and provides a device and an operation method for coupling nitrogen and phosphorus removal, the device for coupling nitrogen and phosphorus removal is used for removing phosphorus and nitrogen from sewage, and comprises a reactor, a liquid inlet assembly, a first treatment assembly, a second treatment assembly and a liquid outlet assembly. The reactor is provided with a containing cavity, a first inlet and a first outlet which are in communication with the containing cavity, the liquid inlet assembly is in communication with the containing cavity through the first inlet, the first treatment assembly is arranged in the containing cavity, the second treatment assembly is arranged in the containing cavity, and the liquid outlet assembly is in communication with the containing cavity through the first outlet. The application can solve the problem of complex recovery of nitrogen and phosphorus in the process of recovering nitrogen and phosphorus from sewage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a device and operation method for coupling nitrogen and phosphorus removal. BACKGROUND

[0002] When sewage is treated, nitrogen and phosphorus in the sewage need to be removed or recovered, so as to achieve the purpose of environmental protection and resource recycling and utilization.

[0003] In the related art, there is a problem of complex recovery in the process of recovering nitrogen and phosphorus from sewage. SUMMARY

[0004] The present application provides a device and operation method for coupling nitrogen and phosphorus removal, which can solve the problem of complex recovery in the process of recovering nitrogen and phosphorus from sewage.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] In a first aspect, the present application provides a device for coupling nitrogen and phosphorus removal, which is used for removing phosphorus and nitrogen from sewage, and includes:

[0007] a reactor, the reactor having a containing cavity and a first inlet and a first outlet communicating with the containing cavity;

[0008] a liquid inlet assembly, which communicates with the containing cavity through the first inlet, and is used for spraying sewage towards the axial direction of the reactor;

[0009] a first treatment assembly, which is arranged in the containing cavity, and is used for removing phosphorus from the sewage;

[0010] a second treatment assembly, which is arranged in the containing cavity, and is used for removing nitrogen from the sewage flowing out of the first treatment assembly;

[0011] a liquid outlet assembly, which communicates with the containing cavity through the first outlet, and is used for conveying the sewage flowing out of the second treatment assembly to the outside of the reactor.

[0012] In some embodiments, the liquid inlet assembly has a first spraying port, which is used for spraying the sewage towards the side close to the first treatment assembly;

[0013] The first treatment assembly includes:

[0014] a first storage member, which is arranged in the containing cavity and extends along the axial direction of the reactor, and is used for containing a first reaction liquid; the first storage member has a first flow channel and a second spraying port arranged towards the first flow channel, and the second spraying port is used for spraying the first reaction liquid towards the first flow channel;

[0015] The first conveying member has a third injection port, and is configured to convey the second reaction solution; the third injection port is located between the inner wall of the reactor and the outer peripheral wall of the first storage member, and / or the third injection port is located in the first flow channel;

[0016] The pH detection member is arranged in the first flow channel.

[0017] The first blocking member is arranged in the accommodating cavity, is located on the side of the first storage member away from the first injection port along the axial direction of the reactor, has a guide cavity and an opening in communication with the guide cavity, and the guide cavity is arranged in a conical shape along the radial direction of the reactor, and the opening is arranged towards the first storage member.

[0018] The first storage member is located inside the opening in the orthographic projection along the radial direction of the reactor.

[0019] In some embodiments, the outer peripheral wall of the first storage member and the inner wall of the reactor enclose the second flow channel, and the second flow channel is in communication with the first flow channel.

[0020] The reactor has a feeding port in communication with the second flow channel, and the feeding port is configured to feed the preset crystal seeds into the second flow channel.

[0021] In some embodiments, the second flow channel comprises a communication section and an expansion section, the inner diameter of the expansion section is greater than that of the communication section, two communication sections are arranged at two ends of the expansion section along the axial direction of the reactor, and the two communication sections are in communication with two ends of the first flow channel along the axial direction of the reactor, respectively.

[0022] The first processing assembly further comprises:

[0023] The first guide member is arranged in the expansion section and connected with the reactor, and extends along the axial direction of the reactor.

[0024] The second guide member is connected with the first guide member, and extends along the axial direction of the reactor.

[0025] The first guide member is arranged in the expansion section and connected with the reactor, and extends along the axial direction of the reactor.

[0026] The first guide member is arranged in the expansion section and connected with the reactor, and extends along the axial direction of the reactor.

[0027] In some embodiments, the fluid injection direction of the first injection port is arranged to intersect with the fluid injection direction of the second injection port.

[0028] In some embodiments, the second injection port is arranged in plurality, and the plurality of second injection ports are arranged in a circumferential direction of the reactor.

[0029] In some embodiments, the second injection port is arranged in plurality, and the plurality of second injection ports are arranged in an axial direction of the reactor.

[0030] In some embodiments, the first processing assembly further comprises:

[0031] A second storage member for storing a first reaction liquid;

[0032] A second conveying member, one end of the second conveying member being in communication with the first storage member, and the other end of the second conveying member being in communication with the second storage member;

[0033] A first pump installed on the second conveying member.

[0034] In some embodiments, the first conveying member comprises a first flow guide section, a first flow distribution section, and a second flow distribution section, the first flow guide section being in communication with the first flow distribution section and the second flow distribution section respectively, and the first flow distribution section and the second flow distribution section being arranged in parallel; a first sub-injection port of the first flow distribution section being located between an inner wall of the reactor and an outer peripheral wall of the first storage member, and a second sub-injection port of the second flow distribution section being located in the first flow channel.

[0035] The first processing assembly further comprises:

[0036] A third storage member for storing a second reaction liquid, and being in communication with the first flow guide section;

[0037] A second pump installed on the first flow guide section;

[0038] A first valve body installed on the first flow distribution section;

[0039] A second valve body installed on the second flow distribution section;

[0040] A first filter member arranged in the accommodation cavity, and the first filter member being located on a side of the first blocking member away from the first storage member;

[0041] A second blocking member arranged in the accommodation cavity, and the second blocking member being located on an end of the first filter member away from the first blocking member;

[0042] A first flushing member arranged in the accommodation cavity, and the first flushing member being located between the first filter member and the reactor, and the first flushing member and the first filter member being arranged in a radial direction of the reactor.

[0043] A third barrier is arranged in the accommodating cavity, and the third barrier is arranged at one end of the first filter away from the second barrier and is connected with the first filter;

[0044] A fourth barrier is connected with the inner wall of the reactor at one end, and is arranged to extend towards the side close to the third barrier at the other end, and the third barrier and the fourth barrier are arranged to be spaced apart along the radial direction of the reactor.

[0045] In some embodiments, the second barrier comprises a first sub-barrier and a second sub-barrier, and the first sub-barrier and the second sub-barrier are arranged to be opposite to each other along the radial direction of the reactor.

[0046] The first sub-barrier is arranged in plurality, and the plurality of first sub-barriers are arranged to be spaced apart along the radial direction of the reactor.

[0047] The second sub-barrier is arranged in plurality, and the plurality of second sub-barriers are arranged to be spaced apart along the radial direction of the reactor.

[0048] The plurality of first sub-barriers and the plurality of second sub-barriers are arranged one-to-one.

[0049] Among the plurality of first sub-barriers and the plurality of second sub-barriers, the outermost first sub-barrier and the outermost second sub-barrier are respectively connected with the inner wall of the reactor along the radial direction of the reactor, and the innermost first sub-barrier and the innermost second sub-barrier are connected along the radial direction of the reactor.

[0050] In some embodiments, the second processing assembly comprises:

[0051] A first partition is connected with the inner wall of the reactor at one end and is connected with the second barrier at the other end, and the second barrier is arranged to be higher than the first partition along the axial direction of the reactor, and the first partition, the second barrier and the reactor jointly enclose a gas filling cavity, and the gas filling cavity is connected with a gas source;

[0052] A second partition is connected with the inner wall of the reactor and is arranged to extend along the radial direction of the reactor, and the second partition and the first partition are arranged to be spaced apart along the axial direction of the reactor.

[0053] A gas disc is arranged at each first partition and is connected with the gas filling cavity, and the gas disc is used to blow out gas towards the side close to the second barrier.

[0054] The first end of the second partition and the inner wall of the reactor are arranged to be spaced apart to form a mud falling port, and the second end of the second partition and the inner wall of the reactor are arranged to be spaced apart to form a liquid discharge port, and the liquid discharge port is arranged to be higher than the mud falling port along the axial direction of the reactor.

[0055] The gap between the first end and the inner wall of the reactor in the direction from the central axis of the reactor to the inner wall of the reactor is smaller than the gap between the gas distribution plate and the inner wall of the reactor.

[0056] The first guide member is arranged in the reactor and has one end above the liquid outlet and the other end outside the reactor in the axial direction of the reactor.

[0057] The second guide member is arranged in the reactor and has one end in the accommodating cavity and the other end outside the reactor in the radial direction of the reactor, and the first guide member and the second guide member are arranged in a spaced manner.

[0058] In some embodiments, the liquid outlet assembly comprises:

[0059] The water storage member is arranged in the reactor and has a water inlet, a first water outlet and a second water outlet, the water inlet is in communication with the first outlet, and the first water outlet and the second water outlet are arranged in a spaced manner in the axial direction of the reactor; the water storage member has an upper liquid zone and a lower liquid zone, the first water outlet is in communication with the upper liquid zone, and the second water outlet is in communication with the lower liquid zone.

[0060] The reflux pipe is in communication with the second water outlet.

[0061] The water tank is in communication with the reflux pipe, and the water tank is used for storing sewage.

[0062] In some embodiments, the liquid inlet assembly comprises:

[0063] The raw water pipe has one end in communication with the water tank and the other end in the accommodating cavity.

[0064] The third pump is in communication with the raw water pipe.

[0065] The raw water pipe comprises a second flow guide section, a third flow distribution section and a fourth flow distribution section, the second flow guide section is in communication with the water tank, and the third pump is arranged in the second flow guide section, one end of the third flow distribution section is in communication with the second flow guide section, the other end of the third flow distribution section is in the accommodating cavity and is arranged towards the first storage member, one end of the fourth flow distribution section is in communication with the second flow guide section, and the other end of the fourth flow distribution section is in communication with the first flushing member.

[0066] The third valve body is in communication with the third flow distribution section.

[0067] The fourth valve body is in communication with the fourth flow distribution section.

[0068] The flow meter is arranged in the third flow distribution section and in the accommodating cavity, one end of the third partition member is connected to the inner wall of the reactor, and the other end of the third partition member extends towards the side close to the central axis of the reactor; the side of the third partition member away from the inner wall of the reactor has a through hole; and the through hole is arranged concentrically with the first flow channel.

[0069] The spray head is arranged on the third partition member and communicates with the third flow distribution section.

[0070] The hinged member is rotatably arranged on the third partition member, and is used for opening or closing the through hole.

[0071] In some embodiments, a plurality of spray heads are arranged, and the plurality of spray heads are arranged at intervals in the circumferential direction of the reactor.

[0072] The third flow distribution section is provided with a plurality of third flow distribution sections, and the plurality of third flow distribution sections are arranged one-to-one with the plurality of spray heads.

[0073] The third flow distribution section is provided with a plurality of sub-flow distribution sections, and the plurality of sub-flow distribution sections are arranged in parallel.

[0074] The liquid inlet assembly further comprises:

[0075] The fifth valve body communicates with the sub-flow distribution section.

[0076] In some embodiments, the reactor further has a second outlet, and the second outlet communicates with the through hole through the accommodating cavity.

[0077] In the second aspect, a running method is provided, and the running method is applied to the device for coupling denitrification and dephosphorization, and the running method comprises the following steps:

[0078] Step one: the sewage is added to the reactor through the liquid inlet assembly, and the sewage is transported to the first treatment assembly to perform dephosphorization treatment on the sewage;

[0079] Step two: the sewage subjected to the dephosphorization treatment is transported to the second treatment assembly to perform denitrification treatment;

[0080] Step three: the sewage subjected to the denitrification treatment is transported to the outside of the reactor by the liquid outlet assembly.

[0081] In some embodiments, the running method further comprises:

[0082] Step four: the struvite crystals generated by the dephosphorization treatment are transported to the outside of the reactor.

[0083] In the present application, the first treatment assembly and the second treatment assembly are arranged in the accommodating cavity respectively, so that the reactor can perform dephosphorization and denitrification treatment on the sewage. Compared with the sewage being respectively introduced into a dephosphorization reactor and a denitrification reactor, the reactor provided in the present application can reduce the operation steps of dephosphorization and denitrification treatment, so that the recovery of nitrogen and phosphorus from the sewage is more convenient. By arranging the liquid inlet assembly, the sewage can be introduced into the accommodating cavity of the reactor, so as to facilitate the dephosphorization and denitrification treatment of the sewage. By arranging the liquid outlet assembly, the sewage can be guided to the outside of the reactor, so as to perform secondary utilization on the sewage subjected to the dephosphorization and denitrification treatment.

[0084] Therefore, the device for coupling denitrification and phosphorus removal provided by the application can solve the problem of complex recovery of nitrogen and phosphorus in the process of wastewater recovery. BRIEF DESCRIPTION OF DRAWINGS

[0085] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0086] Figure 1 The fluid flow chart of the wastewater in the device for coupling denitrification and phosphorus removal provided by the embodiments of the present application;

[0087] Figure 2 The main structure schematic diagram of the device for coupling denitrification and phosphorus removal provided by the embodiments of the present application.

[0088] Explanation of reference signs:

[0089] 10 - device for coupling denitrification and phosphorus removal;

[0090] 100 - reactor; 101 - containing cavity; 102 - first inlet; 103 - first outlet; 104 - feeding port; 105 - second outlet;

[0091] 200 - liquid inlet assembly; 201 - raw water pipe; 2011 - second flow guide section; 2012 - third flow distribution section; 2013 - fourth flow distribution section; 202 - third pump; 203 - third valve body; 204 - fourth valve body; 205 - flow meter; 206 - third partition member; 207 - spray head; 208 - hinged member; 209 - fifth valve body;

[0092] 300 - first treatment assembly; 301 - first storage member; 3011 - first flow channel; 3012 - second spray port; 302 - first conveying member; 3021 - first flow guide section; 3022 - first flow distribution section; 3023 - second flow distribution section; 303 - pH value detection member; 304 - first blocking member; 305 - second flow channel; 3051 - communication section; 3052 - expansion section; 306 - first guide member; 307 - second guide member; 308 - second storage member; 309 - second conveying member; 310 - first pump; 311 - third storage member; 312 - second pump; 313 - first valve body; 314 - second valve body; 315 - first filter member; 316 - second blocking member; 3161 - first sub-blocking member; 3162 - second sub-blocking member; 317 - first flushing member; 318 - third blocking member; 319 - fourth blocking member;

[0093] 400 - second treatment assembly; 401 - first partition; 402 - second partition; 403 - gas disc; 4031 - inclined aeration disc; 4032 - straight aeration disc; 501 - first guide-out component; 502 - second guide-out component; 5021 - water outlet partition; 5022 - exhaust pipe; 5023 - clarification baffle;

[0094] 500 - liquid outlet assembly; 503 - water storage component; 5031 - water inlet; 5032 - first water outlet; 5033 - second water outlet; 5034 - water outlet pool; 5035 - water outlet weir wall plate; 5036 - buffer plate; 5037 - folded baffle; 504 - reflux pipe; 505 - water tank. DETAILED DESCRIPTION

[0095] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. The embodiments described below and the features in the embodiments can be combined with each other without conflict.

[0096] In the phosphorus removal operation of sewage, a chemical crystallization phosphorus removal method is mainly used, struvite (also known as magnesium ammonium phosphate or MAP) can be used, and phosphorus can be recovered.

[0097] Among them, the struvite crystallization method combines phosphate ions with magnesium ions and ammonium ions by adding magnesium salt (such as magnesium chloride or magnesium sulfate) and ammonia in sewage, to form insoluble struvite precipitate.

[0098] Further, when struvite is used to recover phosphorus, the main influencing factors of struvite crystallization are the ratio of nitrogen, phosphorus and magnesium, the solution supersaturation and the impurity composition of sewage. When struvite method is used for denitrification and phosphorus removal, the molar ratio of pH value, Mg, NH4+ and PO43- is usually controlled, and the molar ratio of NH4+ is greater than that of PO43-, which is beneficial to the crystallization reaction to proceed in the positive direction, so as to achieve a high phosphorus removal rate, thus it is easy to cause the NH4+ in the effluent to exceed the standard.

[0099] The currently disclosed reaction device does not involve simultaneous removal of residual ammonia nitrogen in the same reactor after struvite crystallization.

[0100] In the prior art, when sewage is treated by phosphorus removal and denitrification, the sewage needs to be respectively introduced into a phosphorus removal reactor and a denitrification reactor, the sewage is first delivered into the phosphorus removal reactor to perform phosphorus removal treatment on the sewage, and then the sewage after the phosphorus removal treatment is delivered into the denitrification reactor to perform denitrification treatment on the sewage after the phosphorus removal treatment.

[0101] It can be understood that, when sewage is treated by phosphorus removal and denitrification, since the sewage needs to be delivered from the phosphorus removal reactor to the denitrification reactor, the sewage recovery process of nitrogen and phosphorus has the problem of recovery complexity.

[0102] In order to overcome the defects in the prior art, the first treatment assembly and the second treatment assembly are arranged in the containing cavity, the reactor can treat sewage by phosphorus removal and denitrification, compared with respectively introducing the sewage into the phosphorus removal reactor and the denitrification reactor, the reactor provided by the application can reduce the operation steps of phosphorus removal and denitrification treatment, so that the recovery of nitrogen and phosphorus from the sewage is more convenient. By arranging the liquid inlet assembly, the sewage can be introduced into the containing cavity of the reactor, so as to facilitate the phosphorus removal and denitrification treatment of the sewage, and by arranging the liquid outlet assembly, the sewage can be guided out of the reactor to the outside for secondary use.

[0103] Therefore, the device for coupling denitrification and phosphorus removal provided by the application can solve the problem of recovery complexity in the process of recovering nitrogen and phosphorus from sewage.

[0104] The content of the application will be described in detail below with reference to the drawings, so that those skilled in the art can more clearly and detailedly understand the content of the application.

[0105] Among them, Figure 1 The fluid flow chart of the sewage inside the device for coupling denitrification and phosphorus removal provided by the embodiment of the application.

[0106] It should be noted that, Figure 1 The arrow in indicates the flow direction of part of the sewage.

[0107] Figure 2 The main structure diagram of the device for coupling denitrification and phosphorus removal provided by the embodiment of the application.

[0108] As Figure 1 And Figure 2As shown, the coupling de-nitrification and de-phosphorus device 10 provided by the embodiments of the present application is used for de-phosphorus and de-nitrification of sewage, and comprises a reactor 100, a liquid inlet assembly 200, a first treatment assembly 300, a second treatment assembly 400 and a liquid outlet assembly 500. The reactor 100 has a containing cavity 101, a first inlet 102 and a first outlet 103 which are in communication with the containing cavity 101, the liquid inlet assembly 200 is in communication with the containing cavity 101 through the first inlet 102, the liquid inlet assembly 200 is used for spraying sewage towards the axial direction of the reactor 100, the first treatment assembly 300 is arranged in the containing cavity 101 and is used for de-phosphorus treatment of the sewage, the second treatment assembly 400 is arranged in the containing cavity 101 and is used for de-nitrification treatment of the sewage flowing out of the first treatment assembly 300, and the liquid outlet assembly 500 is in communication with the containing cavity 101 through the first outlet 103 and is used for conveying the sewage flowing out of the second treatment assembly 400 to the outside of the reactor 100.

[0109] The specific structure of the coupling de-nitrification and de-phosphorus device 10 and the sewage treatment system and various possible embodiments will be described in detail below.

[0110] It should be noted that in an embodiment, the first treatment assembly 300 can be used for de-phosphorus treatment of the sewage, and the second treatment assembly 400 can be used for de-nitrification treatment of the sewage. In an embodiment, the first treatment assembly 300 can be used for de-nitrification treatment of the sewage, and the second treatment assembly 400 can be used for de-phosphorus treatment of the sewage. Here, the functions of the first treatment assembly 300 and the second treatment assembly 400 are not limited and can be selected according to actual use requirements.

[0111] The liquid inlet assembly 200 provided by the embodiments of the present application has a first spraying port which is used for spraying sewage towards the side close to the first treatment assembly 300, and the first treatment assembly 300 comprises a first storage member 301, a first conveying member 302 and an acid-base value detection member 303. The first storage member 301 is arranged in the containing cavity 101 and extends along the axial direction of the reactor 100, and is used for containing a first reaction liquid. The first storage member 301 has a first flow channel 3011 and a second spraying port 3012 arranged towards the first flow channel 3011, and the second spraying port 3012 is used for spraying the first reaction liquid towards the first flow channel 3011. The first conveying member 302 has a third spraying port and is used for conveying a second reaction liquid. The acid-base value detection member 303 is arranged in the first flow channel 3011.

[0112] It can be understood that by arranging the first treatment assembly 300, the sewage can be sprayed towards the first flow channel 3011 to mix with the first reaction liquid sprayed by the first storage 301 and the second reaction liquid sprayed by the first conveying member 302, so that the phosphate ions in the sewage react to form a supersaturated state of struvite. By arranging the pH detection member 303, the pH in the first flow channel 3011 can be detected to meet the pH for the precipitation reaction of the phosphate ions.

[0113] In an embodiment, two first spray openings are arranged, and the two first spray openings are arranged at intervals in the radial direction of the reactor 100.

[0114] It can be understood that increasing the number of first spray openings can increase the amount of sewage sprayed towards the side close to the first treatment assembly 300.

[0115] In an embodiment, the third spray opening is located between the inner wall of the reactor 100 and the outer peripheral wall of the first storage 301.

[0116] It can be understood that by the above structure, the third spray opening can spray the second reaction liquid between the inner wall of the reactor 100 and the outer peripheral wall of the first storage 301 to react with the sewage and the first reaction liquid to form struvite.

[0117] In an embodiment, the third spray opening is located in the first flow channel 3011.

[0118] It can be understood that by the above structure, the third spray opening can spray the second reaction liquid in the first flow channel 3011 to react with the sewage and the first reaction liquid to form struvite.

[0119] In an embodiment, a plurality of third spray openings are arranged, and a part of the plurality of third spray openings are located between the inner wall of the reactor 100 and the outer peripheral wall of the first storage 301, and another part of the plurality of third spray openings are located in the first flow channel 3011.

[0120] It can be understood that by the above structure, the second reaction liquid sprayed by the third spray opening can react with the sewage and the first reaction liquid to form struvite.

[0121] In an embodiment, two third spray openings are arranged, one of which is located between the inner wall of the reactor 100 and the outer peripheral wall of the first storage 301, and the other of which is located in the first flow channel 3011.

[0122] It can be understood that, through the above structure, the second reaction liquid sprayed by the third spray port can have a precipitation reaction with the sewage and the first reaction liquid, so as to form a supersaturated state of struvite.

[0123] It should be noted that the pH detection member 303 can be a pH meter, a pH electrode, a pH sensor, a pH probe or other pH detection member 303, which is not limited here and can be selected according to actual use requirements.

[0124] It should be noted that in an embodiment, the first reaction liquid is a magnesium salt solution (for example, magnesium chloride solution, magnesium sulfate solution, magnesium carbonate or other magnesium salt solution), and the second reaction liquid is an alkali solution (for example, sodium hydroxide solution, potassium hydroxide solution, ammonia water or other alkali solution). In this case, the reaction PH between the first flow channel 3011 and the inner wall of the reactor 100 and the outer peripheral wall of the first storage member 301 is 8.5 to 9.5.

[0125] It can be understood that, through the above embodiment, the phosphate ions in the sewage can combine with magnesium ions and ammonium ions to form a struvite supersaturated state, so as to recover phosphorus in the sewage.

[0126] It should be noted that in an embodiment, the first reaction liquid is an alkali solution (for example, sodium hydroxide solution, potassium hydroxide solution, ammonia water or other alkali solution), and the second reaction liquid is a magnesium salt solution (for example, magnesium chloride solution, magnesium sulfate solution, magnesium carbonate or other magnesium salt solution). In this case, the reaction PH between the first flow channel 3011 and the inner wall of the reactor 100 and the outer peripheral wall of the first storage member 301 is 8.5 to 9.5.

[0127] It should be noted that, through the above embodiment, the phosphate ions in the sewage can combine with magnesium ions and ammonium ions to form a struvite supersaturated state, so as to recover phosphorus in the sewage.

[0128] It should be noted that the first storage member 301 can be a medicine cartridge, a glass bottle, a plastic cartridge or other components that can play a storage role, which is not limited here and can be selected according to actual use requirements.

[0129] It should be noted that when the first storage member 301 is a medicine cartridge, the medicine cartridge is trumpet-shaped, and the medicine cartridge includes a sealing plate, a medicine spraying plate and an outwardly expanding baffle connected in sequence. The sealing plate, the medicine spraying plate and the outwardly expanding baffle together form a closed hollow cylindrical structure. The sealing plate forms the outer wall of the medicine cartridge, the medicine spraying plate forms the inner wall of the medicine cartridge, and the outwardly expanding baffle forms the top wall of the medicine cartridge. The sealing plate and the sealing plate form an angle of 12° to 15°.

[0130] The first processing assembly 300 provided by the embodiment of the present application further comprises a first blocking piece 304, which is arranged in the accommodating cavity 101 and is opposite to the first storage piece 301 in the axial direction of the reactor 100, and has a guide cavity and an opening communicating with the guide cavity. The guide cavity is arranged in a tapered manner in the radial direction of the reactor 100, and the opening is arranged towards the first storage piece 301 in the radial direction of the reactor 100. The orthographic projection of the first storage piece 301 on the plane where the opening is located is located inside the opening.

[0131] It can be understood that, by the above embodiment, the first blocking piece 304 can block the flow of the sewage, so that the solute molecules of struvite in the sewage are attached to the surface of the existing crystal grains by collision in the crystallization process, thereby promoting the growth of the crystal grains.

[0132] It should be noted that the first blocking piece 304 can be a reflective plate, a conical groove or other components capable of blocking, which is not limited herein and can be selected according to actual use requirements.

[0133] In an embodiment, when the first blocking piece 304 is a reflective plate, the outer diameter of the reflective plate is 1.1 times the diameter of the sealing plate, and the distance between the edge of the reflective plate and the upper edge of the sealing plate in the axial direction of the reactor 100 is 30-50 cm.

[0134] The outer peripheral wall of the first storage piece 301 and the inner wall of the reactor 100 form a second flow channel 305, the second flow channel 305 and the first flow channel 3011 are communicated, the reactor 100 has a feeding port 104, the feeding port 104 is communicated with the second flow channel 305, and the feeding port 104 is used for feeding the preset crystal seeds to the second flow channel 305.

[0135] It can be understood that, by arranging the second flow channel 305, the length of the sewage can be increased, so that the flow time of the sewage is increased, thereby facilitating the crystallization inside the sewage to recover the phosphorus, and the space occupation inside the reactor 100 can be optimized to improve the utilization rate of the internal space of the reactor 100. By arranging the feeding port 104, the supersaturation state of struvite can be broken by feeding to form the growth of struvite crystal grains. Specifically, the supersaturation degree is one of the driving forces of crystallization. When the solution reaches or exceeds the supersaturation state, the solute molecules are more likely to gather to form crystal nuclei, thereby promoting the crystallization process.

[0136] It should be noted that the preset crystal seeds can be struvite crystal grains, which are not limited herein and can be selected according to actual use requirements, as long as the crystal grains of the preset crystal seeds are the same as the types of the crystal grains.

[0137] The second flow channel 305 provided by the embodiment of the present application comprises a communication section 3051 and an expansion section 3052, the inner diameter of the expansion section 3052 is greater than the inner diameter of the communication section 3051, the communication section 3051 is provided with two, along the axial direction of the reactor 100, the two communication sections 3051 are respectively arranged at the two ends of the expansion section 3052, and the two communication sections 3051 are respectively communicated with the two ends of the first flow channel 3011 along the axial direction of the reactor 100, the first treatment assembly 300 further comprises a first guide 306 and a second guide 307, the first guide 306 is located in the expansion section 3052 and connected with the reactor 100, the first guide 306 extends along the axial direction of the reactor 100, and the second guide 307 is connected with the first guide 306 and extends along the axial direction intersecting with the reactor 100.

[0138] It can be understood that by arranging the expansion section 3052, the flow speed of the sewage flowing out after passing through the first flow channel 3011 can be slowed down when the sewage flows into the expansion section 3052 after passing through the communication section 3051, so that more crystallization time is provided. After the sewage flowing out of the expansion section 3052 flows into the communication section 3051, the sewage can be accelerated in the communication section 3051, so that the flow speed of the sewage flowing into the first flow channel 3011 is increased, thereby making the mixing of the sewage, the first reaction liquid and the second reaction liquid more uniform. By arranging the first guide 306 and the second guide 307, the first guide 306 and the second guide 307 can block the flow of the sewage, so that in the crystallization process of the phosphorus in the sewage, the solute molecules struvite in the sewage are attached to the surface of the existing crystal grains by collision, thereby promoting the growth of the crystal grains.

[0139] In an embodiment, the inner diameter of the expansion section 3052 is 1.2 times the inner diameter of the communication section 3051, and the height ratio of the communication section 3051 to the expansion section 3052 along the axial direction of the reactor 100 is 1:2.

[0140] It can be understood that by the above-mentioned embodiment, the flow speed of the sewage flowing into the expansion section 3052 is slowed down, thereby providing more crystallization time, which is beneficial to the growth of the crystal grains of the crystallization.

[0141] Further, the first guide 306 and the second guide 307 can be connected by an integrated molding method, or a welding fixed method, or other fixed methods, which are not limited here and can be selected according to actual use requirements.

[0142] Further, the included angle between the first guide 306 and the second guide 307 can be any value between 0 degrees and 180 degrees, which is not limited here and can be selected according to actual use requirements.

[0143] In an embodiment, the first guide 306 and the second guide 307 are arranged in an array inside the reactor 100, and the distance between adjacent two first guides 306 and adjacent two second guides 307 is equal, the first guides 306 are vertically parallel, and the second guides 307 are arranged in an opposite manner; the first guides 306 and the second guides 307 in each layer are arranged at equal distances, and a gap is left between the upper and lower layers, the top end of the first guide 306 in the lower layer is located on the same vertical line as the top end of the second guide 307 in the upper layer, and the top end of the second guide 307 in the lower layer is located on the same vertical line as the first guide 306 in the upper layer.

[0144] Further, the first guide 306 is provided with a plurality of first guides 306, and the second guide 307 is provided with a plurality of second guides 307, the plurality of first guides 306 and the plurality of second guides 307 have a plurality of different arrangement modes, and the arrangement modes of the first guide 306 and the second guide 307 will be illustrated in turn.

[0145] In an embodiment, along the circumferential direction of the reactor 100, the plurality of first guides 306 are arranged at intervals, the second guide 307 is provided with a plurality of second guides 307, along the circumferential direction of the reactor 100, the plurality of second guides 307 are arranged at intervals, and the plurality of first guides 306 and the plurality of second guides 307 are connected one by one.

[0146] It can be understood that increasing the number of the first guide 306 and the second guide 307 can further block the flow of sewage, so that the solute molecules of struvite in the sewage collide and adhere to the surface of the existing crystal grains during the crystallization process, thereby promoting the growth of the crystal grains.

[0147] The arrangement of the first guide 306 and the second guide 307 can eliminate the vortex caused by the diameter mutation, straighten the water flow, and make the crystal grains in a positive fluidized growth state; and the water flow and the small crystal grains can uniformly enter the gap area between the first guide 306 and the second guide 307, break the supersaturation state of struvite in the fluid through the deflection and slight impact of the water flow between the first guide 306 and the second guide 307, increase the contact surface with the small crystal grains, strengthen the induced crystallization process, and improve the phosphorus removal load. At the same time, a part of the amorphous struvite particles can collide and break when descending with the water flow, break the dispersion structure, form small struvite particles, and re-crystallize and grow.

[0148] In an embodiment, along the axial direction of the reactor 100, the plurality of first guides 306 are arranged at intervals, along the axial direction of the reactor 100, the plurality of second guides 307 are arranged at intervals, and the plurality of first guides 306 and the plurality of second guides 307 are connected one by one.

[0149] It can be understood that increasing the number of the first guide 306 and the second guide 307 can further block the flow of the sewage, so that the solute molecules struvite in the sewage collide and adhere to the surface of the existing crystal grains during the crystallization process of phosphorus in the sewage, thereby promoting the growth of the crystal grains.

[0150] In an embodiment, the plurality of first guides 306 are arranged at intervals along the circumferential direction of the reactor 100, and the plurality of second guides 307 are arranged at intervals along the circumferential direction of the reactor 100, and the plurality of first guides 306 and the plurality of second guides 307 are connected one by one. The plurality of first guides 306 are arranged at intervals along the axial direction of the reactor 100, and the plurality of second guides 307 are arranged at intervals along the axial direction of the reactor 100, and the plurality of first guides 306 and the plurality of second guides 307 are connected one by one. That is, the plurality of first guides 306 and the plurality of second guides 307 are arranged in an array in the expansion section 3052.

[0151] It can be understood that increasing the number of the first guide 306 and the second guide 307 can further block the flow of the sewage, so that the solute molecules struvite in the sewage collide and adhere to the surface of the existing crystal grains during the crystallization process of phosphorus in the sewage, thereby promoting the growth of the crystal grains. And the above arrangement can make the arrangement of the first guide 306 and the second guide 307 in the expansion section 3052 more uniform, thereby reducing the occurrence of turbulence of the sewage in the expansion section 3052, so that the crystallization crystal grains of the sewage conform to the flow direction of the sewage, so that the crystal grains are in a positive flow growth state, and the flow of the sewage and the micro-crystal grains is more stable, and a part of the amorphous crystal grains can collide and break with the first guide 306 and the second guide 307, thereby breaking the dispersion structure of the crystal grains, thereby making the crystal grains recrystallize and grow.

[0152] Further, a gap is left between the two adjacent first guides 306 and the two adjacent second guides 307, and the interval distance is equal, the first guides 306 and the second guides 307 of each height are arranged at equal intervals, and the top end of the second guide 307 in the upper layer and the first guide 306 in the lower layer are on the same vertical line, and the bottom end of the second guide 307 in the lower layer and the first guide 306 in the upper layer are on the same vertical line.

[0153] It can be understood that the arrangement of the plurality of first guides 306 and the plurality of second guides 307 is not limited, and can be selected according to actual use needs.

[0154] The expansion section 3052 can slow down the water flow rate, which is conducive to crystal growth; the first guide 306 and the second guide 307 can eliminate vortex caused by diameter mutation, straighten the water flow, and make the crystal grains in a positive fluidized growth state; and the water flow and the tiny crystal grains can enter the gap region between the first guide 306 and the second guide 307 uniformly, break the supersaturation state of struvite in the fluid through the deflection and slight impact of the water flow between the first guide 306 and the second guide 307, increase the contact surface with the tiny crystal grains, strengthen the induced crystallization process, and improve the phosphorus removal load. At the same time, a part of the amorphous struvite particles can collide and break when descending with the water flow, break the dispersion structure, form tiny struvite particles, and recrystallize and grow.

[0155] The first injection port of the embodiment of the present application is provided in a direction intersecting the fluid injection direction of the second injection port 3012.

[0156] It can be understood that through the above-mentioned embodiments, the mixing of the fluid injected by the first injection port and the fluid injected by the second injection port 3012 can be more uniform, so that the two fluids are fully contacted and reacted, thereby forming a supersaturation state of the crystal grains.

[0157] Further, the injection direction of the first injection port can be a spiral clockwise direction, or a spiral counterclockwise direction, or an axial direction of the reactor 100, which is not limited here and can be selected according to actual use requirements.

[0158] Further, the injection direction of the second injection port 3012 can be a spiral clockwise direction, or a spiral counterclockwise direction, or a radial direction of the reactor 100, which is not limited here and can be selected according to actual use requirements.

[0159] In one embodiment, the injection direction of the first injection port is a spiral clockwise direction, and the injection direction of the second injection port 3012 is a spiral counterclockwise direction.

[0160] It can be understood that through the above-mentioned embodiments, the mixing of the fluid injected by the first injection port and the fluid injected by the second injection port 3012 can be more uniform, so that the two fluids are fully contacted and reacted, thereby forming a supersaturation state of the crystal grains.

[0161] It should be noted that the second injection port 3012 is provided with a plurality of second injection ports 3012, which can be spaced apart along the circumferential direction of the reactor 100, or spaced apart along the axial direction of the reactor 100, or spaced apart along both the circumferential direction of the reactor 100 and the axial direction of the reactor 100, which is not limited here and can be selected according to actual use requirements.

[0162] It can be understood that, through the above embodiment, the number of the second injection ports 3012 can be increased, so that the injection positions of the first reaction liquid are more, so that the mixing of the first reaction liquid and the sewage is more uniform.

[0163] The first processing assembly 300 provided by the embodiment of the present application further comprises a second storage 308, a second conveying member 309, and a first pump 310. The second storage 308 is used for storing the first reaction liquid. One end of the second conveying member 309 is in communication with the first storage 301, and the other end of the second conveying member 309 is in communication with the second storage 308. The first pump 310 is installed on the second conveying member 309.

[0164] It can be understood that, through the above embodiment, the first reaction liquid in the second storage 308 can be conveyed to the first storage 301 through the second conveying member 309 and the first pump 310.

[0165] The first conveying member 302 provided by the embodiment of the present application comprises a first flow guide section 3021, a first flow distribution section 3022, and a second flow distribution section 3023. The first flow guide section 3021 is in communication with the first flow distribution section 3022 and the second flow distribution section 3023 respectively. The first flow distribution section 3022 and the second flow distribution section 3023 are arranged in parallel. The first sub-injection ports of the first flow distribution section 3022 are located between the inner wall of the reactor 100 and the outer peripheral wall of the first storage 301. The second sub-injection ports of the second flow distribution section 3023 are located in the first flow channel 3011. The first processing assembly 300 further comprises a third storage 311, a second pump 312, a first valve body 313, and a second valve body 314. The third storage 311 is used for storing the second reaction liquid and is in communication with the first flow guide section 3021. The second pump 312 is installed on the first flow guide section 3021. The first valve body 313 is installed on the first flow distribution section 3022. The second valve body 314 is installed on the second flow distribution section 3023.

[0166] It can be understood that, through the above embodiment, the second reaction liquid flowing out of the third storage member 311 can pass through the first flow guide section 3021, the second pump 312, then pass through the first flow distribution section 3022 and the first valve body 313, and then flow out to the space between the inner wall of the reactor 100 and the outer peripheral wall of the first storage member 301 through the first sub-injection port. The second reaction liquid flowing out of the third storage member 311 can pass through the first flow guide section 3021, the second pump 312, then pass through the second flow distribution section 3023 and the second valve body 314, and then flow out to the first flow channel 3011 through the second sub-injection port. Thus, the second reactor 100 can simultaneously deliver the second reaction liquid to the space between the inner wall of the reactor 100 and the outer peripheral wall of the first storage member 301, and to the first flow channel 3011. When the second reaction liquid is an alkali solution, through the above embodiment, the alkali solution can flow into the first flow channel 3011 and the second flow channel 305, so that the phosphorus in the sewage can crystallize in an alkaline environment.

[0167] In an embodiment, the second flow distribution section 3023 located in the first flow channel 3011 is located at the bottom 1 / 5 of the first storage member 301 and towards the center of the first flow channel 3011. The first flow distribution section 3022 located between the inner wall of the reactor 100 and the outer peripheral wall of the first storage member 301 is located in the communication section 3051.

[0168] It can be understood that, through the above embodiment, when the second reaction liquid is an alkali solution, the alkali solution can flow into the corresponding flow channel from the side close to the inlet of the first flow channel 3011 and the second flow channel 305, so that the phosphorus in the sewage can crystallize in an alkaline environment.

[0169] The first treatment assembly 300 provided by the embodiment of the present application further comprises a first filter member 315, a second blocking member 316, and a first flushing member 317. The first filter member 315 is arranged in the containing cavity 101 and located on the side of the first blocking member 304 away from the first storage member 301. The second blocking member 316 is arranged in the containing cavity 101 and located on the end of the first filter member 315 away from the first blocking member 304. The first flushing member 317 is arranged in the containing cavity 101 and located between the first filter member 315 and the reactor 100, and the first flushing member 317 and the first filter member 315 are arranged in a spaced manner along the radial direction of the reactor 100.

[0170] It can be understood that by arranging the first filter 315, the crystal grains in the sewage can be filtered, and the crystal grains in the sewage can also be attached to the first filter 315. By arranging the first flushing member 317, the first filter 315 can be flushed, so that the crystal grains attached to the first filter 315 can fall off from the first filter 315 under the impact of the first flushing member 317, thereby entering the second flow channel 305 after passing through the first blocking member 304. By arranging the second blocking member 316, the sewage can be circulated between the first blocking member 304 and the second blocking member 316, so that the phosphorus in the sewage can crystallize.

[0171] In an embodiment, the mesh number of the first filter 315 is 40-50 mesh.

[0172] It can be understood that by the above-mentioned embodiments, the first filter 315 can be effectively used for the filtration of the sewage and the separation process of the crystal grains and the sewage, and can trap larger particle crystal grains while allowing smaller particle crystal grains to pass through.

[0173] The first treatment assembly 300 provided by the embodiments of the present application further comprises a third blocking member 318 and a fourth blocking member 319. The third blocking member 318 is arranged in the accommodating cavity 101, and is located at one end of the first filter 315 away from the second blocking member 316 and is connected with the first filter 315. One end of the fourth blocking member 319 is connected to the inner wall of the reactor 100, and the other end of the fourth blocking member 319 extends towards the side close to the third blocking member 318. The third blocking member 318 and the fourth blocking member 319 are arranged in a spaced manner along the radial direction of the reactor 100.

[0174] It can be understood that by arranging the third blocking member 318 and the fourth blocking member 319, the small particle crystal grains and the sewage after passing through the first filter 315 can enter the second flow channel 305 after passing through the third blocking member 318 and the fourth blocking member 319. The arrangement of the third blocking member 318 and the fourth blocking member 319 can block the flow of the sewage, so that in the crystallization process of the phosphorus in the sewage, the solute molecules struvite in the sewage are attached to the surface of the existing crystal grains by collision, thereby promoting the growth of the crystal grains. The above-mentioned arrangement can make a part of the amorphous crystal grains collide and break with the first guide member 306 and the second guide member 307, thereby breaking the dispersion structure of the crystal grains, so that the crystal grains are recrystallized and grown.

[0175] In an embodiment, the third barrier 318 and the fourth barrier 319 are arranged at an angle therebetween, and the angle therebetween is 60-90 degrees. In the axial direction of the reactor 100, the projection length of the orthographic projection of the third barrier 318 on the bottom surface of the reactor 100 is 2-3 cm longer than the projection length of the orthographic projection of the fourth barrier 319 on the bottom surface of the reactor 100. In the radial direction of the reactor 100, the third barrier 318 is arranged apart from the first reflecting member.

[0176] It can be understood that, through the above embodiment, the third barrier 318 and the fourth barrier 319 can block the flow of the sewage, and the arrangement of the third barrier 318 and the fourth barrier 319 can reduce the influence of the fluid between the inner wall of the reactor 100 and the outer peripheral wall of the first storage member 301 on the reflux of the fine particles, and can guide the effective reflux and fall of the settled fine particles between the inner wall of the reactor 100 and the outer peripheral wall of the first storage member 301 under the water flow therebetween, as the induced seeds for the struvite crystallization, without adding new seeds.

[0177] The first filter member 315 and the second barrier 316 can screen and settle the fine struvite particles and reflux them between the inner wall of the reactor 100 and the outer peripheral wall of the first storage member 301 as the induced seeds for the struvite crystallization, for further growth, so that new seeds do not need to be added after the first batch of seeds are added.

[0178] The above arrangement can make a part of the amorphous particles collide and break with the first guide member 306 and the second guide member 307, so as to break the dispersion structure of the particles, so that the particles are recrystallized and grown. In addition, the large particle seeds that have not passed through the first filter member 315 can enter the second flow channel 305 under the action of gravity after passing through the space between the third barrier 318 and the first reflecting member.

[0179] The second barrier 316 provided by the embodiments of the present application comprises a first sub-barrier 3161 and a second sub-barrier 3162, which are oppositely arranged along the radial direction of the reactor 100. The first sub-barrier 3161 is provided in plurality, and the plurality of first sub-barriers 3161 are arranged at intervals along the radial direction of the reactor 100. The second sub-barrier 3162 is provided in plurality, and the plurality of second sub-barriers 3162 are arranged at intervals along the radial direction of the reactor 100. The plurality of first sub-barriers 3161 and the plurality of second sub-barriers 3162 are arranged in one-to-one correspondence. Among the plurality of first sub-barriers 3161 and the plurality of second sub-barriers 3162, the outermost first sub-barrier 3161 and the outermost second sub-barrier 3162 are respectively connected to the inner wall of the reactor 100 along the radial direction of the reactor 100. The innermost first sub-barrier 3161 and the innermost second sub-barrier 3162 are connected along the radial direction of the reactor 100.

[0180] Through the above-mentioned embodiments, the sewage can enter the second treatment assembly 400 after passing through the gap between the adjacent first sub-barriers 3161 and the adjacent second sub-barriers 3162. By increasing the number of the first sub-barriers 3161 and the second sub-barriers 3162, the crystal grains in the sewage can be blocked to reduce the occurrence of crystal grains mixed into the second treatment assembly 400.

[0181] In an embodiment, the extension direction of the first sub-barrier 3161 forms an angle of 30-70 degrees with the radial direction of the reactor 100, and the extension direction of the second sub-barrier 3162 forms an angle of 30-70 degrees with the radial direction of the reactor 100. The number of the first sub-barriers 3161 is 5-10, and the number of the second barriers 316 is 5-10. The plurality of first sub-barriers 3161 are arranged in parallel, and the distance between the adjacent two first sub-barriers 3161 is 5-15 cm. The plurality of second sub-barriers 3162 are arranged in parallel, and the distance between the adjacent two second sub-barriers 3162 is 5-15 cm.

[0182] It can be understood that through the above-mentioned embodiments, the distribution of the plurality of first sub-barriers 3161 and the plurality of second sub-barriers 3162 can be more uniform, thereby further enhancing the blocking effect of the crystal grains in the sewage.

[0183] The second treatment assembly 400 provided by the embodiments of the present application comprises a first partition member 401, a second partition member 402, and a gas disc 403. One end of the first partition member 401 is connected to the inner wall of the reactor 100, and the other end of the first partition member 401 is connected to the second blocking member 316, which is arranged higher than the first partition member 401 along the axial direction of the reactor 100. The first partition member 401, the second blocking member 316, and the reactor 100 jointly enclose a gas charging cavity, and the gas charging cavity is connected to a gas source. The second partition member 402 is connected to the inner wall of the reactor 100 and is arranged to extend along the radial direction intersecting the reactor 100. The second partition member 402 is arranged to be spaced apart from the first partition member 401 along the axial direction of the reactor 100. The gas disc 403 is arranged at the first partition member 401 and is in communication with the gas charging cavity. The gas disc 403 is used to blow gas towards the side close to the second partition member 402. The first end of the second partition member 402 and the inner wall of the reactor 100 are arranged to be spaced apart to form a sludge falling port. The second end of the second partition member 402 and the inner wall of the reactor 100 are arranged to be spaced apart to form a liquid discharge port. The liquid discharge port is arranged to be higher than the sludge falling port along the axial direction of the reactor 100. The gap between the first end and the inner wall of the reactor 100 along the direction from the central axis of the reactor 100 to the inner wall of the reactor 100 is smaller than the gap between the gas disc 403 and the inner wall of the reactor 100.

[0184] Through the above-mentioned embodiments, the second treatment assembly 400 can perform denitrification treatment on the sewage. By arranging the second blocking member 316 to be higher than the first partition member 401, the sludge falling from the sludge falling port can fall onto the first partition member 401, so as to prevent the sludge from entering the first treatment assembly 300 after passing through the gap between two adjacent first sub-blocking members 3161 or the gap between two adjacent second sub-blocking members 3162, thereby reducing the pollution of the sludge to the crystal grains.

[0185] In some embodiments, anaerobic ammonia oxidation granular sludge is arranged in the second treatment assembly 400. The anaerobic ammonia oxidation granular sludge can convert ammonia nitrogen in the sewage into nitrite under aerobic conditions, and then generate nitrogen gas under anaerobic conditions by taking ammonia as an electron donor and nitrite as an electron acceptor. In this process, the anaerobic ammonia oxidation granular sludge can pass through the second partition member 402 and reach the sludge falling port.

[0186] The first partition member 401 and the second partition member 402 mainly perform short-cut nitrification reaction, i.e., the anaerobic ammonia oxidation granular sludge converts ammonia nitrogen in the sewage into nitrite under aerobic conditions. The upper part of the second partition member 402 mainly performs anaerobic ammonia oxidation reaction, i.e., nitrogen gas is generated under anaerobic conditions by taking ammonia as an electron donor and nitrite as an electron acceptor.

[0187] Further, since the flow speed of the gas blown by the gas disc 403 is fast, it can cause the gap between the reactor 100 and the gas disc 403 to generate negative pressure, so that the anaerobic ammonia oxidation granular sludge can enter the area between the second partition member 402 and the first partition member 401, and the sludge outlet is not blocked. Then, under the driving of the gas blown by the gas disc 403, the anaerobic ammonia oxidation granular sludge can flow in the area between the second partition member 402 and the first partition member 401, and the nitrite can further mix with the ammonia in the area between the second partition member 402 and the first partition member 401 to generate nitrogen. Thus, the denitrification treatment of the sewage can be realized.

[0188] It should be noted that, along the axial direction of the reactor 100, the second partition member 402 is arranged at an angle of 10 to 30 degrees between the position where the second partition member 402 is located and the radial direction of the reactor 100.

[0189] The residual NH4+ performs short-range nitrification between the first partition member 401 and the second partition member 402, and then the air is collected and discharged through the first guide member 501 or the second guide member 502, and the sludge-water mixture enters the upper part of the second partition member 402 to perform anaerobic ammonia oxidation, and the generated nitrogen is discharged through the first guide member 501 or the second guide member 502. Below the clarification baffle 5023, the water flow channel changes from large to small, and the water outlet flow channel formed above the clarification baffle 5023 expands from small to large, and after the sludge-water mixture enters this area, the granular sludge can be settled and enter the sludge outlet.

[0190] Further, in an embodiment, along the axial direction of the reactor 100, the second partition member 402 is arranged at an angle of 20 degrees between the position where the second partition member 402 is located and the radial direction of the reactor 100.

[0191] It can be understood that, through the above embodiment, the second partition member 402 can be arranged obliquely, so that the sludge can be guided to the sludge outlet along the second partition member 402. Since the water flow is driven upward by the inclined aeration of the inclined aeration disc 403 below the sludge outlet, and the flow speed is greater than that of the area above the second partition member 402, due to the Venturi effect, negative pressure is generated in the lower part of the sludge outlet, and the granular sludge can enter the lower part of the second partition member 402 without obstruction, and the sludge outlet is not blocked. Thus, the accumulation of sludge on the second partition member 402 can be reduced. In addition, the fluid channel below the second partition member 402 can be made to change from large to small, and the fluid channel above the second partition member 402 can be made to change from small to large. In this process, the sewage and the sludge can be separated, so that the sludge can be settled and enter the sludge outlet.

[0192] Further, by providing the gas-filled cavity, the flow speed of the gas blown by the gas disc 403 can be more stable, so that the uneven aeration caused by unstable pressure can be optimized.

[0193] In an embodiment, the second barrier 316 is arranged 3-5 cm higher than the first partition 401 along the axial direction of the reactor 100.

[0194] It can be understood that, through the above embodiment, the second barrier 316 can block the sludge to reduce the pollution of the sludge to the crystal grains.

[0195] In an embodiment, the length of the sludge falling port is 10-15 cm, the length of the liquid discharge port is 25-30 cm, the gas disc 403 includes an inclined aeration disc 4031 and a vertical aeration disc 4032, the inclined aeration disc 4031 is arranged below the side of the second partition 402 close to the sludge falling port along the radial direction of the reactor 100, and the angle between the gas flow direction of the inclined aeration disc 4031 and the axial direction of the reactor 100 is 30 degrees, the vertical aeration disc 4032 is arranged below the side of the second partition 402 close to the liquid discharge port along the radial direction of the reactor 100, and the gas flow direction of the vertical aeration disc 4032 is arranged in the same direction as the axial direction of the reactor 100.

[0196] The combination of the orientation of the first partition 401 and the inclined aeration of the inclined aeration disc 4031 and the vertical aeration of the vertical aeration disc 4032 can make a small part of the granular sludge in the reactor 100 fall on the first partition 401, and most of it flow to the upper side of the second partition 402 under the impact of the water flow and the gas flow, preventing it from entering the gap between the second barrier 316 and polluting the struvite below.

[0197] It can be understood that, through the above embodiment, the occurrence of turbulent flow of the wastewater in the reactor 100 can be reduced, thereby improving the operation stability of the device 10 for coupled denitrification and phosphorus removal. And the inclined aeration of the inclined aeration disc 4031 below the sludge falling port can drive the wastewater to flow upwards, and the flow rate is greater than that in the upper area of the second partition 402, due to the Venturi effect, a negative pressure is generated in the lower part of the sludge falling port, and the sludge can enter the lower area of the second partition 402 without obstruction, without causing sludge blockage. The combination of the inclined aeration of the inclined aeration disc 4031 and the vertical aeration of the vertical aeration disc 4032 can make the sludge entering the lower area of the second partition 402 flow in the direction of the upper end of the second partition 402 under the push flow of aeration, and cannot fall into the inside of the first treatment assembly 300.

[0198] The liquid outlet assembly 500 provided by the embodiments of the present application comprises a first outlet member 501 and a second outlet member 502. The first outlet member 501 is arranged in the reactor 100 and extends along the axial direction of the reactor 100. One end of the first outlet member 501 is located above the liquid outlet, and the other end of the first outlet member 501 is located outside the reactor 100. The second outlet member 502 is arranged in the reactor 100 and extends along the radial direction of the reactor 100. One end of the second outlet member 502 is located in the accommodating cavity 101, and the other end of the second outlet member 502 is located outside the reactor 100. The first outlet member 501 and the second outlet member 502 are arranged in a spaced manner along the radial direction of the reactor 100.

[0199] It can be understood that, by arranging the first outlet member 501 and the second outlet member 502, the gas blown out of the gas disc 403 into the reactor 100 can be discharged outside the reactor 100, so as to reduce the increase of the gas volume in the reactor 100 and the increase of the pressure in the reactor 100 caused by the increase of the gas volume, thereby protecting the reactor 100. In addition, the nitrogen generated in the reactor 100 can also be discharged outside the reactor 100, so as to reduce the increase of the gas volume in the reactor 100 and the increase of the pressure in the reactor 100 caused by the increase of the gas volume, thereby protecting the reactor 100. In some embodiments, the gas blown out of the first outlet member 501 and the second outlet member 502 can be collected, so as to recycle the gas and the nitrogen.

[0200] In an embodiment, the distance between the first outlet member 501 and the liquid outlet is 20-25 cm. The projection of the first outlet member 501 on the plane where the liquid outlet is located covers the liquid outlet, and the length or width of the projection of the first outlet member 501 on the plane where the liquid outlet is located is greater than 10 cm of the length of the liquid outlet. The first gas outlet of the first outlet member 501 is 50 cm higher than the top wall of the reactor 100.

[0201] It can be understood that, by the above-mentioned embodiments, the first outlet member 501 can collect the gas at the liquid outlet, so that the gas can be discharged outside the reactor 100 through the first outlet member 501.

[0202] In an embodiment, the second guide-out component 502 comprises a water outlet partition 5021, an exhaust pipe 5022 and a clarification baffle 5023, the exhaust pipe 5022 is located between the water outlet partition 5021 and the clarification baffle 5023, and is connected with the water outlet partition 5021 and the clarification baffle 5023 respectively, one end of the water outlet partition is connected with the inner wall of the reactor 100, the other end of the water outlet partition is connected with the exhaust pipe 5022, the angle between the extension direction of the clarification baffle 5023 and the radial direction of the reactor 100 is 20 degrees, the side of the clarification baffle 5023 away from the exhaust pipe 5022 extends to one fourth of the diameter of the reactor 100, and the distance between the end of the exhaust pipe 5022 away from the water outlet partition 5021 and the outer wall of the reactor 100 is 50 cm.

[0203] It can be understood that, through the above-mentioned embodiment, the second guide-out component 502 can collect the gas in the reactor 100, so that the gas can be discharged to the outside of the reactor 100 through the second guide-out component 502. By arranging the water outlet partition 5021 and the clarification baffle 5023, the fluid in the reactor 100 can flow to the upper side of the clarification baffle 5023 through the gap between the clarification baffle 5023 and the inner wall of the reactor 100.

[0204] Further, the distance between the water outlet partition 5021 and the top wall of the reactor 100 is 1-1.5 m.

[0205] Through the above-mentioned embodiment, the sewage in the reactor 100 can flow out to the first outlet 103 through the gap between the water outlet partition 5021 and the top wall of the reactor 100, and then be discharged to the outside of the reactor 100.

[0206] The liquid outlet assembly 500 provided by the embodiment of the present application further comprises a water storage component 503, a backflow pipe 504 and a water tank 505. The water storage component 503 is arranged in the reactor 100, and has a water inlet 5031, a first water outlet 5032 and a second water outlet 5033. The water inlet 5031 is communicated with the first outlet 103, and the first water outlet 5032 and the second water outlet 5033 are arranged at intervals along the axial direction of the reactor 100. The water storage component 503 has an upper liquid area and a lower liquid area, the first water outlet 5032 is communicated with the upper liquid area, and the second water outlet 5033 is communicated with the lower liquid area. The backflow pipe 504 is communicated with the second water outlet 5033, and the water tank 505 is communicated with the backflow pipe 504. The water tank 505 is used for storing sewage.

[0207] It can be understood that by setting the water inlet 5031, the fluid in the reactor 100 can flow into the inside of the water storage part 503 through the first outlet 103 and the water inlet 5031, so that the water storage part 503 can collect the fluid flowing out of the reactor 100. The setting of the water storage part 503 can also precipitate and clarify the sewage flowing out of the reactor 100, so that the sewage is stratified, so that the water quality of the sewage flowing out of the first water outlet 5032 is better, and the sewage flowing out of the second water outlet 5033 can be transported to the water tank 505 through the reflux pipe 504.

[0208] In an embodiment, the water storage part 503 comprises a water outlet pool 5034, a water outlet weir wall plate 5035, a buffer plate 5036 and a folded baffle 5037. The water outlet weir wall plate 5035 is arranged on the inside of the water outlet pool 5034 and is lower than the first outlet 103 by 3-5 cm. The buffer plate 5036 is arranged between the first water outlet 5032 and the water outlet weir wall plate 5035, the upper end of the buffer plate 5036 is fixed to the top end of the reactor 100, and the lower end is spaced apart from the water outlet weir floor to form a gap. The folded baffle 5037 is arranged in the reactor 100, and the lower end of the folded baffle 5037 is higher than the lower end of the buffer plate 5036 by 3-5 cm.

[0209] It can be understood that through the above-mentioned embodiments, the water outlet pool 5034, the water outlet weir wall plate 5035, the buffer plate 5036 and the folded baffle 5037 can block the sewage, so that the flow speed of the sewage is slowed down, so that the flow rate of the sewage flowing into the first water outlet 5032 and the second water outlet 5033 is slowed down, so that the flow of the sewage is more stable.

[0210] The liquid inlet assembly 200 provided by the embodiment of the present application comprises a raw water pipe 201 and a third pump 202. One end of the raw water pipe 201 is in communication with the water tank 505, and the other end of the raw water pipe 201 is located in the containing cavity 101. The third pump 202 is communicated with the raw water pipe 201.

[0211] It can be understood that through the above-mentioned embodiments, the sewage in the water tank 505 can be transported into the containing cavity 101 through the third pump 202 and the raw water pipe 201. The water tank 505 can also store the sewage.

[0212] The raw water pipe 201 provided by the embodiment of the present application comprises a second flow guide section 2011, a third flow distribution section 2012 and a fourth flow distribution section 2013. The second flow guide section 2011 is communicated with the water tank 505, and the third pump 202 is arranged in the second flow guide section 2011. One end of the third flow distribution section 2012 is communicated with the second flow guide section 2011, and the other end of the third flow distribution section 2012 is arranged in the containing cavity 101 and faces the first storage member 301. One end of the fourth flow distribution section 2013 is communicated with the second flow guide section 2011, and the other end of the fourth flow distribution section 2013 is communicated with the first flushing member 317.

[0213] It can be understood that, through the above embodiment, the water in the water tank 505 can be distributed to two different positions of the reactor 100 through the second flow guide section 2011, the third flow distribution section 2012 and the fourth flow distribution section 2013, and the flow and flow rate of the sewage in the second flow guide section 2011 can be controlled through the third pump 202.

[0214] The liquid inlet assembly 200 provided by the embodiment of the present application further comprises a third valve body 203, a fourth valve body 204 and a flow meter 205. The third valve body 203 is communicated with the third flow distribution section 2012, the fourth valve body 204 is communicated with the fourth flow distribution section 2013, and the flow meter 205 is arranged in the third flow distribution section 2012.

[0215] It can be understood that, through the arrangement of the third valve body 203 and the fourth valve body 204, the third flow distribution section 2012 and the fourth flow distribution section 2013 can be controlled to be opened or closed, which has the advantage of simple control. Through the arrangement of the flow meter 205, the flow of the sewage in the third flow distribution section 2012 can be detected.

[0216] The liquid inlet assembly 200 provided by the embodiment of the present application further comprises a third partition member 206, a spray head 207 and a hinged member 208. The third partition member 206 is arranged in the containing cavity 101. One end of the third partition member 206 is connected with the inner wall of the reactor 100, and the other end of the third partition member 206 extends towards the side close to the central axis of the reactor 100. The side of the third partition member 206 away from the inner wall of the reactor 100 has a through hole. The spray head 207 is arranged in the third partition member 206 and communicated with the third flow distribution section 2012. The hinged member 208 is rotatably arranged on the third partition member 206, and is used to open or close the through hole.

[0217] It can be understood that through the above-mentioned embodiments, the sewage sprayed by the spray head 207 can be transported into the first flow channel 3011, and the sewage can also circulate between the third partition member 206 and the first blocking member 304. In addition, the third partition member 206 can guide the crystal grains in the reactor 100, so that the crystal grains can enter the first flow channel 3011 under the spraying force of the spray head 207, thereby increasing the volume of the crystal grains. When the volume of the crystal grains increases to a predetermined size, the crystal grains can fall into the bottom of the reactor 100 through the through hole under the action of gravity.

[0218] In an embodiment, the included angle between the third partition member 206 and the inner wall of the reactor 100 is 115 degrees to 120 degrees, the diameter of the through hole is one tenth of the inner diameter of the reactor 100, the side of the third partition member 206 away from the inner wall of the reactor 100 is provided with a flow regulating groove, the opening of the flow regulating groove is arranged towards the first flow channel 3011, the flow regulating groove extends along the circumferential direction of the reactor 100, and the extension length of the flow regulating groove along the circumferential direction of the reactor 100 accounts for one fifth of the length of the position where the third partition member 206 is located.

[0219] It should be noted that the water outlet of the spray head 207 forms a first spraying port, and the first spraying port is arranged in a spiral along the flow regulating groove in a clockwise direction, so that the sewage sprayed by the first spraying port rises in a spiral manner.

[0220] It can be understood that through the above-mentioned embodiments, the third partition member 206 can guide the crystal grains in the reactor 100, so that the crystal grains can enter the first flow channel 3011 under the spraying force of the spray head 207. By arranging the flow regulating groove, the sewage can be converged, and the crystal grains can also be collected, so that the crystal grains can enter the first flow channel 3011 under the spraying force of the spray head 207. In some embodiments, two spray heads 207 converge into two water inlets through respective flow regulating grooves, and are connected with opposite flow regulating grooves, so that the water outlet of the two spray heads 207 is more uniform.

[0221] When the crystal particle size increases to be insufficient to rise with the water flow, the particles enter the lower part of the reactor 100 through the through hole, thereby achieving the purpose of controlling the particle size of the struvite particles.

[0222] It should be noted that when the spray head 207 pressurizes and sprays water upward, a negative pressure is formed at the upper part due to the Venturi effect, which can cause the pressure at the lower part of the hinged member 208 to be greater than the pressure at the upper part of the hinged member 208. The pressure at the lower part of the hinged member 208 can press the hinged member 208, so that the hinged member 208 opens upward, thereby opening the through hole. When the spray head 207 stops spraying water, the pressure difference between the upper and lower sides of the hinged member 208 disappears, and the hinged member 208 moves downward under the action of gravity, so that the through hole is closed.

[0223] The design of the hinge 208 can control its opening and closing through the Venturi effect pressure difference generated by the water outlet of the spray head 207. When the crystal precipitation reaches a certain amount, the water inlet is stopped, the hinge 208 is closed, the water flow is effectively isolated, the crystal is discharged, the sewage overflow is prevented, and the water content of the crystalline material during discharge is effectively reduced.

[0224] The through hole is concentrically arranged with the first flow channel 3011.

[0225] It can be understood that through the above-mentioned implementation, the hinge 208 can maintain an upwardly open state when the spray head 207 continuously discharges water under pressure, and the through hole is open. Therefore, the crystal grains in the first flow channel 3011 can fall into the bottom of the reactor 100 under the action of gravity, so that the bottom of the reactor 100 collects the crystal grains.

[0226] The spray head 207 provided by the embodiment of the present application is provided with a plurality of spray heads 207, which are arranged at intervals along the circumferential direction of the reactor 100, and the third flow dividing section 2012 is provided with a plurality of third flow dividing sections 2012, which are arranged one-to-one with the plurality of spray heads 207.

[0227] It can be understood that increasing the number of spray heads 207 and third flow dividing sections 2012 can facilitate the control of the flow of sewage sprayed by a single spray head 207, thereby facilitating the quantitative control of the sewage added to the reactor 100.

[0228] It should be noted that the number of spray heads 207 can be 1, 2, 3, or any value greater than or equal to 1, which is not limited here and can be selected according to actual use requirements. The number of third flow dividing sections 2012 can be 1, 2, 3, or any value greater than or equal to 1, which is not limited here and can be selected according to actual use requirements.

[0229] In one implementation, the spray head 207 is provided with two spray heads 207, which are arranged at intervals along the circumferential direction of the reactor 100, and the third flow dividing section 2012 is provided with two third flow dividing sections 2012, which are arranged one-to-one with the two spray heads 207.

[0230] It can be understood that through the above-mentioned implementation, the two spray heads 207 can increase the delivery volume and delivery efficiency of the sewage, and can facilitate the control of the flow of sewage sprayed by a single spray head 207, thereby facilitating the quantitative control of the sewage added to the reactor 100.

[0231] Further, the third flow distribution section 2012 provided by the application is provided with a plurality of sub-flow distribution sections, the plurality of sub-flow distribution sections are provided in parallel, and the liquid inlet assembly 200 further comprises: a fifth valve body 209, which is communicated with the sub-flow distribution sections.

[0232] It can be understood that, by providing the sub-flow distribution sections and the fifth valve body 209, the volume of the sewage flowing out of the spray head 207 can be controlled more finely.

[0233] It should be noted that the number of the sub-flow distribution sections can be 2, 3, 4 or any value greater than or equal to 2, which is not limited herein and can be selected according to actual use requirements, and the number of the fifth valve body 209 is not limited, as long as it is equal to the number of the sub-flow distribution sections.

[0234] In an embodiment, the sub-flow distribution sections are provided in three, the three sub-flow distribution sections are provided in parallel, and the fifth valve body 209 is provided in three, the three sub-flow distribution sections and the three fifth valve bodies 209 are provided one by one.

[0235] The reactor 100 provided by the embodiment of the application further has a second outlet 105, which is communicated with the through hole through the containing cavity 101.

[0236] It can be understood that, by providing the second outlet 105, the crystals falling into the containing cavity 101 through the through hole can be collected conveniently.

[0237] The embodiment of the application can remove phosphorus and denitrify through the following steps.

[0238] The struvite crystal seeds are added into the reactor 100, the seed inoculation amount is 2%-3% (the seed inoculation amount refers to the ratio of the crystals added into the reactor 100 to all the crystals collected at the bottom of the reactor 100), the fourth valve body 204 is closed, the third valve body 203 is opened, and the number of the fifth valve body 209 opened is adjusted according to the flow of the flow meter 205. The pH in the first flow channel 3011 and the second flow channel 305 is controlled to be 8.5-9.5 through two-way alkali liquid feeding control. The sewage containing phosphorus and nitrogen is sprayed into the first flow channel 3011 through the rectifier groove in a clockwise spiral, the magnesium salt reagent is sprayed into the sewage in a counterclockwise spiral through the second spraying port 3012, the flow of the first pump 310 is controlled to control the Mg 2+ : NH4 + : PO4 3-The molar ratio is 1.2-1.5:1.1-1.2:1, so that the reactor 100 is in an environment suitable for the growth of struvite seeds. The spirally rising sewage is changed in direction by the first blocking piece 304, and the flow direction of the sewage changes to downward into the internal circulation. When the downward flow passes through the expansion section 3052, the flow rate is further reduced. The first guide piece 306 and the second guide piece 307 can eliminate the vortex effect caused by the sudden expansion of the expansion section 3052 and increase the crystallization residence time of the struvite seed.

[0239] A part of the sewage flows upward through the first filter piece 315, and the first filter piece 315 can only pass the crystalline substances below 40 mesh particle size. The sewage passing through the first filter piece 315 is further settled by the second blocking piece 316. Every 5-6 hours, the fourth valve body 204 and the fourth shunt section 2013 are opened to flush the first filter piece 315, so as to prevent the first filter piece 315 from being clogged and hardened.

[0240] The nitrogen-containing sewage after phosphorus removal by crystallization enters the short-cut nitrification-anammox zone, and the sewage is biologically denitrified by the integrated short-cut nitrification-anammox. When running, the air source is opened, the air enters the aeration chamber, and then passes through the air disc 403 to enter the short-cut nitrification. The air at the tail end of the short-cut nitrification is discharged from the reactor 100 through the first discharge piece 501 or the second discharge piece 502. The sewage enters the upper part of the second partition piece 402 for anammox denitrification, and the nitrogen gas generated is discharged from the reactor 100 through the first discharge piece 501 or the second discharge piece 502. After denitrification, the sewage enters the upper part of the effluent partition plate 5021, and the sludge enters the sludge outlet.

[0241] The flow rate of the spray head 207 is controlled to control the upward flow rate of the sewage, and then the particle size of the struvite particles in the first flow channel 3011 is controlled. The continuously growing crystalline substances in the reactor 100 cannot be carried by the upward flow due to gravity, that is, they fall into the bottom of the reactor 100. The crystalline substances with low water content are periodically discharged from the second outlet 105, so as to realize the recovery of phosphorus resources.

[0242] The embodiment of the present application provides a running method, which is applied to the device 10 for coupled denitrification and phosphorus removal provided by any of the above-mentioned embodiments, and the running method comprises the following steps:

[0243] Step one: The sewage is added to the reactor 100 through the liquid inlet assembly 200, and the sewage is transported to the first treatment assembly 300, so as to perform phosphorus removal treatment on the sewage;

[0244] Step two: The sewage subjected to the phosphorus removal treatment is transported to the second treatment assembly 400 for denitrification treatment;

[0245] Step three: The sewage subjected to the denitrification treatment is transported to the outside of the reactor 100 by the liquid outlet assembly 500.

[0246] It can be understood that through the above steps, the sewage can be made to pass through the liquid inlet assembly 200 to enter the inside of the reactor 100, and then the first treatment assembly 300 can perform phosphorus removal treatment on the sewage, the sewage after phosphorus removal treatment can pass through the second treatment assembly 400 to perform denitrification treatment, and the sewage after denitrification treatment can be transported to the outside of the reactor 100 through the liquid outlet assembly 500. Thus, the phosphorus removal and denitrification treatment of the sewage can be completed, and the treatment is simple.

[0247] It should be noted that in an embodiment, the sewage is added to the reactor 100 through the liquid inlet assembly 200, and the fourth valve body 204 needs to be closed and the third valve body 203 needs to be opened.

[0248] In this case, the water in the water tank 505 can be sprayed towards the first flow channel 3011 after passing through the second flow guide section 2011, the third pump 202, the third flow guide section 2012, the third valve body 203, the fifth valve body 209, the flow meter 205 and the spray head 207.

[0249] It should be noted that in an embodiment, the sewage entering the first flow channel 3011 flows along the arrangement direction of the first flow channel 3011 and reaches the first blocking piece 304. The sewage at the first blocking piece 304 can be divided into two parts, one part of the sewage passes through one communication section 3051 above the expansion section 3052, the expansion section 3052, another communication section 3051 below the expansion section 3052, and is collected into the flow regulating groove along the third partition piece 206, and then reenters the first flow channel 3011 under the action of the spray head 207.

[0250] Further, the other part of the sewage reaching the first blocking piece 304 can pass through the gap between the first blocking piece 304 and the first filter piece 315, reach above the first blocking piece 304, and pass through the first filter piece 315, and then be divided into two parts. One part of the sewage reaches the third blocking piece 318 and the fourth blocking piece 319 under the action of gravity, passes through the gap between the third blocking piece 318 and the fourth blocking piece 319, and flows into one communication section 3051 above the expansion section 3052.

[0251] Further, the other part of the sewage divided by the first filter piece 315 can pass through the gap of the second blocking piece 316 to reach above the first partition piece 401, and under the driving of the inclined aeration disc 4031 and the straight aeration disc 4032, pass through the liquid outlet into the upper part of the second partition piece 402, and then pass through the clarification baffle 5023, the water outlet partition 5021 and the water inlet 5031 to reach the water storage piece 503.

[0252] Further, the upper liquid in the water storage member 503 can be discharged through the first water outlet 5032, and the lower liquid in the water storage member 503 can reach the water tank 505 through the second water outlet 5033 and the reflux pipe 504.

[0253] Thus, the nitrogen and phosphorus removal treatment of the sewage can be completed.

[0254] Further, when the first filter member 315 needs to be flushed, the fourth valve body 204 can be opened, and the water in the water tank 505 can reach the first flushing member 317 through the second flow guide section 2011, the third pump 202, the third flow distribution section 2012, and the fourth valve body 204. The water flowing out of the first flushing member 317 can flush the first filter member 315 and flow into the upper part of the first blocking member 304.

[0255] It should be noted that the operation method provided by the embodiments of the present application further includes:

[0256] Step four: deliver the struvite crystals generated by the phosphorus removal treatment to the outside of the reactor 100.

[0257] It can be understood that through the above embodiments, the struvite crystals can be collected, so that the phosphorus in the sewage can be recycled.

[0258] It should be noted that when the nozzle 207 is under pressure and discharges water upward, a negative pressure is formed at the upper part due to the Venturi effect, which causes the pressure at the lower part of the hinged member 208 to be greater than the pressure at the upper part of the hinged member 208. The pressure at the lower part of the hinged member 208 can squeeze the hinged member 208, so that the hinged member 208 is opened upward, thereby opening the through hole. When the crystal particle size increases to be insufficient to rise with the water flow, the particles enter the lower part of the reactor 100 through the through hole, thereby achieving the purpose of controlling the particle size of the struvite particles.

[0259] It should be noted that in an embodiment, the second storage member 308 stores a magnesium salt solution, and the magnesium salt solution in the second storage member 308 is delivered to the first storage member 301 through the second delivery member 309 and the first pump 310, and then sprayed into the first flow channel 3011 through the second spray port 3012.

[0260] It should be noted that in an embodiment, the third storage member 311 stores an alkali solution, and the alkali solution in the third storage member 311 flows to the first flow distribution section 3022 and the second flow distribution section 3023 through the first flow guide section 3021 and the second pump 312, respectively. The alkali solution flowing into the first flow distribution section 3022 can flow into the second flow channel 305 through the first valve body 313, and the alkali solution flowing into the second flow distribution section 3023 can flow into the first flow channel 3011 through the second valve body 314.

[0261] It should be noted that by adding magnesium salt solution and lye into the sewage, the phosphate ions in the sewage can be combined with magnesium ions and ammonium ions to form struvite supersaturation state, so as to recover the phosphorus in the sewage.

[0262] It should be noted that the terms "one embodiment", "an embodiment", "exemplary embodiment", "some embodiments", and / or the like, in the specification can refer to a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of those skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

[0263] In general, terminology can be understood at least in part from usage in context. For example, terms, such as "one or more" as used herein, can be taken to mean that any feature, structure, or characteristic is at the very least one, or alternatively, can be one or more. As used herein, such terms as "one or more" can be understood to encompass a single item as well as a combination of two or more items. Similarly, terms, such as "a" or "an" as used herein can be taken to mean one or more things unless otherwise indicated.

[0264] It should be readily understood that the terms "on", "above", and "on top of", as used in the specification, are to be interpreted in the broadest context to mean not only "directly on something" but also to include the meaning of "on something" with intervening features or layers therebetween, and that "above" or "on top of" not only includes the meaning of "above" or "on top of something" but also can include the meaning of "above" or "on top of something" without intervening features or layers therebetween (i.e., directly on something).

[0265] In addition, spatially relative terms, such as "beneath", "below", "lower", "above", "upper", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90° or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0266] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for coupling denitrification and phosphorus removal for phosphorus removal and denitrification of sewage, characterized by, The device (10) for coupling denitrification and dephosphorization comprises: a reactor (100) having a containing cavity (101) and a first inlet (102) and a first outlet (103) communicating with the containing cavity (101); a liquid inlet assembly (200) communicating with the containing cavity (101) through the first inlet (102), the liquid inlet assembly (200) being configured to spray the sewage towards an axial direction of the reactor (100); a first treatment assembly (300) arranged in the containing cavity (101), the first treatment assembly (300) being configured to perform dephosphorization treatment on the sewage; a second treatment assembly (400) arranged in the containing cavity (101), the second treatment assembly (400) being configured to perform denitrification treatment on the sewage flowing out of the first treatment assembly (300); a liquid outlet assembly (500) communicating with the containing cavity (101) through the first outlet (103), the liquid outlet assembly (500) being configured to deliver the sewage flowing out of the second treatment assembly (400) to an outside of the reactor (100); the liquid inlet assembly (200) has a first spray port configured to spray the sewage towards a side close to the first treatment assembly (300); the first treatment assembly (300) comprises: a first storage member (301) arranged in the containing cavity (101) and extending along an axial direction of the reactor (100), the first storage member (301) being configured to contain a first reaction liquid; the first storage member (301) has a first flow channel (3011) and a second spray port (3012) arranged towards the first flow channel (3011), the second spray port (3012) being configured to spray the first reaction liquid towards the first flow channel (3011); a peripheral wall of the first storage member (301) and an inner wall of the reactor (100) enclose a second flow channel (305), the second flow channel (305) and the first flow channel (3011) communicate; the second flow channel (305) comprises a communication section (3051) and an expansion section (3052), an inner diameter of the expansion section (3052) is greater than an inner diameter of the communication section (3051), the communication section (3051) is provided with two, along the axial direction of the reactor (100), two communication sections (3051) are arranged at two ends of the expansion section (3052), and two communication sections (3051) respectively communicate two ends of the first flow channel (3011) along the axial direction of the reactor (100); the second treatment assembly (400) comprises: A first partition member (401) is connected to an inner wall of the reactor (100) at one end, and is connected to a second blocking member (316) at the other end. The second blocking member (316) is arranged higher than the first partition member (401) along the axial direction of the reactor (100). The first partition member (401), the second blocking member (316) and the reactor (100) jointly enclose a gas charging cavity, and the gas charging cavity is circumscribed by a gas source. A second partition member (402) is connected to the inner wall of the reactor (100) and is arranged to extend along the radial direction intersecting the reactor (100). The second partition member (402) and the first partition member (401) are arranged to be spaced apart along the axial direction of the reactor (100). A gas disc (403) is arranged on the first partition member (401) and is in communication with the gas charging cavity. The gas disc (403) is used to blow out gas towards the side close to the second partition member (402).

2. The device for coupling denitrification and dephosphorization according to claim 1, characterized by, The first processing assembly (300) further comprises: A first conveying member (302) has a third jet port. The first conveying member (302) is used to convey a second reaction liquid. The third jet port is located between the inner wall of the reactor (100) and the peripheral wall of the first storage member (301), and / or the third jet port is located in the first flow channel (3011). An acid-base detection member (303) is arranged in the first flow channel (3011). A first blocking member (304) is arranged in the containing cavity (101). The first blocking member (304) is located on the side of the first storage member (301) away from the first jet port along the axial direction of the reactor (100). The first blocking member (304) has a guide cavity and an opening in communication with the guide cavity. The guide cavity is arranged to be tapered along the radial direction of the reactor (100). The opening is arranged towards the first storage member (301). The first storage member (301) is located inside the opening along the radial direction of the reactor (100).

3. The device for coupling denitrification and dephosphorization according to claim 2, characterized by, The reactor (100) has a feeding port (104) in communication with the second flow channel (305). The feeding port (104) is used to feed predetermined seed crystals towards the second flow channel (305).

4. The device for coupling denitrification and dephosphorization according to claim 3, characterized by, The first processing assembly (300) further comprises: A first guide member (306) is located in the expansion section (3052) and is connected to the reactor (100). The first guide member (306) is arranged to extend along the axial direction of the reactor (100). A second guide member (307) is connected to the first guide member (306) and is arranged to extend along the axial direction intersecting the reactor (100). The first guide member (306) is provided with a plurality of first guide members (306) which are arranged at intervals along the circumferential direction of the reactor (100), and the second guide member (307) is provided with a plurality of second guide members (307) which are arranged at intervals along the circumferential direction of the reactor (100), and the plurality of first guide members (306) and the plurality of second guide members (307) are connected one by one in correspondence. And / or, the first guide member (306) is provided with a plurality of first guide members (306) which are arranged at intervals along the axial direction of the reactor (100), and the second guide member (307) is provided with a plurality of second guide members (307) which are arranged at intervals along the axial direction of the reactor (100), and the plurality of first guide members (306) and the plurality of second guide members (307) are connected one by one in correspondence.

5. The device for coupled denitrification and phosphorus removal according to any one of claims 2-4, characterized in that, The fluid injection direction of the first injection port intersects with the fluid injection direction of the second injection port (3012).

6. The device for coupled de-nitrification and de-phosphorization according to any one of claims 2-4, characterized in that, The second injection port (3012) is provided with a plurality of second injection ports (3012) which are arranged at intervals along the circumferential direction of the reactor (100). And / or, the second injection port (3012) is provided with a plurality of second injection ports (3012) which are arranged at intervals along the axial direction of the reactor (100).

7. The device for coupled de-nitrification and de-phosphorization according to any one of claims 2-4, characterized in that, The first processing assembly (300) further comprises: A second storage member (308) for storing the first reaction liquid; A second conveying member (309) having one end in communication with the first storage member (301) and the other end in communication with the second storage member (308); A first pump (310) installed on the second conveying member (309).

8. The device for coupled de-nitrification and de-phosphorization according to any one of claims 2-4, characterized in that, The first conveying member (302) comprises a first flow guide section (3021), a first flow distribution section (3022) and a second flow distribution section (3023), the first flow guide section (3021) is in communication with the first flow distribution section (3022) and the second flow distribution section (3023) respectively, and the first flow distribution section (3022) and the second flow distribution section (3023) are arranged in parallel; the first sub-injection port of the first flow distribution section (3022) is located between the inner wall of the reactor (100) and the outer peripheral wall of the first storage member (301), and the second sub-injection port of the second flow distribution section (3023) is located in the first flow channel (3011); The first processing assembly (300) further comprises: A third storage member (311) for storing the second reaction liquid and in communication with the first flow guide section (3021); A second pump (312) installed on the first flow guide section (3021); A first valve body (313) installed on the first flow distribution section (3022); A second valve body (314) installed on the second flow distribution section (3023); A first filter (315) is arranged in the accommodating cavity (101), and the first filter (315) is located on the side of the first blocking piece (304) away from the first storage piece (301); A second blocking piece (316) is arranged in the accommodating cavity (101), and the second blocking piece (316) is located on the end of the first filter (315) away from the first blocking piece (304); A first flushing piece (317) is arranged in the accommodating cavity (101), and the first flushing piece (317) is located between the first filter (315) and the reactor (100) along the radial direction of the reactor (100), and the first flushing piece (317) and the first filter (315) are arranged in a spaced manner; A third blocking piece (318) is arranged in the accommodating cavity (101), and the third blocking piece (318) is located on the end of the first filter (315) away from the second blocking piece (316) and is connected with the first filter (315); A fourth blocking piece (319) is connected to the inner wall of the reactor (100) on one end, and is arranged to extend towards the side close to the third blocking piece (318) on the other end, and the third blocking piece (318) and the fourth blocking piece (319) are arranged in a spaced manner along the radial direction of the reactor (100).

9. The device for coupled denitrification and phosphorus removal according to claim 8, characterized in that, The second blocking piece (316) comprises a first sub-blocking piece (3161) and a second sub-blocking piece (3162), and the first sub-blocking piece (3161) and the second sub-blocking piece (3162) are arranged in a spaced manner along the radial direction of the reactor (100); A plurality of first sub-blocking pieces (3161) are arranged in a spaced manner along the radial direction of the reactor (100); A plurality of second sub-blocking pieces (3162) are arranged in a spaced manner along the radial direction of the reactor (100); The plurality of first sub-blocking pieces (3161) and the plurality of second sub-blocking pieces (3162) are arranged in a one-to-one correspondence; Among the plurality of first sub-blocking pieces (3161) and the plurality of second sub-blocking pieces (3162), the outermost first sub-blocking piece (3161) and the outermost second sub-blocking piece (3162) are respectively connected with the inner wall of the reactor (100) along the radial direction of the reactor (100); and the innermost first sub-blocking piece (3161) and the innermost second sub-blocking piece (3162) are connected along the radial direction of the reactor (100).

10. The device for coupled denitrification and phosphorus removal according to claim 9, characterized in that, The first end of the second partition piece (402) and the inner wall of the reactor (100) are arranged in a spaced manner to form a mud falling port, and the second end of the second partition piece (402) and the inner wall of the reactor (100) are arranged in a spaced manner to form a liquid discharge port, and the liquid discharge port is arranged to be higher than the mud falling port along the axial direction of the reactor (100); The gap between the first end and the inner wall of the reactor (100) in the direction from the central axis of the reactor (100) to the inner wall of the reactor (100) is smaller than the gap between the gas disc (403) and the inner wall of the reactor (100); The second processing assembly (400) further comprises: A first guide member (501) is arranged in the reactor (100) and is located above the liquid outlet in the axial direction of the reactor (100), and the other end of the first guide member (501) is located outside the reactor (100); A second guide member (502) is arranged in the reactor (100), one end of the second guide member (502) is located in the containing cavity (101), and the other end of the second guide member (502) is located outside the reactor (100), and the first guide member (501) and the second guide member (502) are arranged in a spaced manner in the radial direction of the reactor (100).

11. The device for coupled denitrification and phosphorus removal according to claim 10, characterized in that, The liquid outlet assembly (500) comprises: A water storage member (503) is arranged in the reactor (100), the water storage member (503) has a water inlet (5031), a first water outlet (5032) and a second water outlet (5033), the water inlet (5031) is communicated with the first outlet (103), and the first water outlet (5032) and the second water outlet (5033) are arranged in a spaced manner in the axial direction of the reactor (100); the water storage member (503) has an upper liquid area and a lower liquid area, the first water outlet (5032) is communicated with the upper liquid area, and the second water outlet (5033) is communicated with the lower liquid area; A reflux pipe (504) is communicated with the second water outlet (5033); A water tank (505) is communicated with the reflux pipe (504), and the water tank (505) is used for storing the sewage.

12. The device for coupled de-nitrification and de-phosphorization according to claim 11, characterized in that, The liquid inlet assembly (200) comprises: A raw water pipe (201), one end of the raw water pipe (201) is communicated with the water tank (505), and the other end of the raw water pipe (201) is located in the containing cavity (101); A third pump (202) is communicated with the raw water pipe (201); The raw water pipe (201) comprises a second flow guide section (2011), a third flow distribution section (2012) and a fourth flow distribution section (2013), the second flow guide section (2011) is communicated with the water tank (505), and the third pump (202) is arranged in the second flow guide section (2011), one end of the third flow distribution section (2012) is communicated with the second flow guide section (2011), the other end of the third flow distribution section (2012) is located in the containing cavity (101) and is arranged towards the first storage member (301), one end of the fourth flow distribution section (2013) is communicated with the second flow guide section (2011), and the other end of the fourth flow distribution section (2013) is communicated with the first flushing member (317); A third valve body (203) is communicated with the third flow branch (2012); A fourth valve body (204) is communicated with the fourth flow branch (2013); A flow meter (205) is arranged in the third flow branch (2012); A third partition member (206) is arranged in the accommodating cavity (101), one end of the third partition member (206) is connected with the inner wall of the reactor (100), the other end of the third partition member (206) extends towards the side close to the central axis of the reactor (100); the side of the third partition member (206) away from the inner wall of the reactor (100) has a through hole; the through hole is arranged concentrically with the first flow channel (3011); A spray head (207) is arranged on the third partition member (206) and communicated with the third flow branch (2012); A hinged member (208) is rotatably arranged on the third partition member (206), and the hinged member (208) is used for opening or closing the through hole.

13. The device for coupled denitrification and phosphorus removal according to claim 12, characterized in that, A plurality of spray heads (207) are arranged along the circumferential direction of the reactor (100); A plurality of third flow branches (2012) are arranged one by one corresponding to a plurality of spray heads (207); The third flow branch (2012) is provided with a plurality of sub-flow branches, and the plurality of sub-flow branches are arranged in parallel; The liquid inlet assembly (200) further comprises: A fifth valve body (209) is communicated with the sub-flow branch.

14. The apparatus for coupled denitrification and phosphorus removal according to claim 12 or 13, characterized in that, The reactor (100) further has a second outlet (105) communicated with the through hole through the accommodating cavity (101).

15. A method of operation, characterized by, The device for coupling denitrification and phosphorus removal according to any one of claims 1-14, wherein the operation method comprises the following steps: Step one: the sewage is added to the reactor (100) through the liquid inlet assembly (200), and the sewage is transported to the first treatment assembly (300) to remove phosphorus from the sewage; Step two: the sewage treated by the phosphorus removal is transported to the second treatment assembly (400) for denitrification treatment; Step three: the sewage treated by the denitrification treatment is transported to the outside of the reactor (100) by the liquid outlet assembly (500).

16. The method of operating of claim 15, wherein, The operation method further comprises: Step four: the struvite crystals generated by the phosphorus removal treatment are transported to the outside of the reactor (100).

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