A method for treating wastewater containing metformin

Abstract

The present application discloses a method for treating metformin-containing sewage, which relates to the technical field of sewage treatment. Specifically, the method comprises the following steps: installing an aeration device in a disinfection tank provided with an ultraviolet lamp, an inlet and outlet circulation component and a stirring component; adding sulfite into the disinfection tank after the sewage enters the disinfection tank, so that the sulfite concentration in the sewage in the disinfection tank reaches 630 mg / L to 1890 mg / L; turning on the ultraviolet lamp, the aeration device and the stirring component, stirring continuously for 20 to 40 minutes and then discharging the sewage in the disinfection tank into the next process; achieving the technical effect of significant effect, simplicity, convenience, low risk, low cost and stable and reliable treatment of metformin-containing sewage.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a method for treating sewage containing metformin. Background Art

[0002] Metformin (MET) is a commonly used oral drug for the treatment of type 2 diabetes and is widely used worldwide. MET cannot be metabolized by the human body. After oral administration, about 70% of MET will be excreted from the body in the form of urine or feces and enter the sewage treatment plant with domestic sewage. In recent years, MET has been frequently detected in water environments such as surface water, groundwater, and drinking water, indicating that the existing processes of sewage treatment plants have limited effect on MET treatment. Therefore, it is imperative to improve the link control of sewage treatment plants and strengthen their removal efficiency of MET.

[0003] MET has a small molecular weight and strong water solubility; scholars have also conducted relevant research on the removal effect of MET in various process sections of sewage treatment plants. Scheurer et al. used a small experiment to simulate the removal effect of MET by conventional processes in water plants and found that coagulation and activated carbon filtration had little effect on MET removal. In the biological treatment section, MET will be converted into guanylcarboxamide (Guanylurea, GNL), but the specific conversion rate is still unclear; GNL has strong chemical stability and is difficult to further degrade, so there is a certain amount of GNL (17% to 95%) in the effluent; UV photolysis has a very limited removal rate for MET (<10%). Chlorine oxidation has a certain removal rate for MET (≈50%), but there is a risk of producing highly toxic by-products; conventional processes have limited effects on MET removal, and more efficient treatment measures must be taken. Current technical research on this link mainly includes UV / H2O2, UV / Fe2+ / PMS, UV / Fe2+ / H2O2 and other advanced oxidation treatment measures based on ultraviolet light; these measures have, to a certain extent, enabled the MET in the effluent of conventional processes to be controlled to a certain extent; however, the use of H2O2 has inconveniences in storage and transportation, and water plant addition; PMS has poor stability and is prone to explosion; the introduction of iron salts will lead to the production of iron sludge, increasing sludge production and disposal costs.

[0004] Therefore, a method for treating metformin-containing wastewater that is effective, simple, convenient, low-risk, low-cost, stable and reliable is needed to add a safety barrier for sewage treatment plants to control MET. Summary of the invention

[0005] The embodiment of the present application provides a method for treating metformin-containing wastewater, thereby solving the technical problems of poor efficiency, great difficulty in operation, high risk and high cost in the prior art treatment methods for metformin-containing wastewater, and achieving the technical effect of significant effect, simplicity and convenience, low risk, low cost and stable and reliable treatment of metformin-containing wastewater.

[0006] An embodiment of the present application provides a method for treating metformin-containing wastewater, which specifically comprises: installing an aeration device in a disinfection tank provided with an ultraviolet lamp, an inlet and outlet circulation component, and a stirring component; adding sulfite into the interior of the disinfection tank after the sewage enters the disinfection tank, so that the sulfite concentration in the sewage in the disinfection tank reaches 630 mg / L to 1890 mg / L; and turning on the ultraviolet lamp, the aeration device, and the stirring component, continuously stirring for 20 to 40 minutes, and then discharging the sewage in the disinfection tank into the next process.

[0007] Preferably, the sulfite added is sodium sulfite; the amount of sulfite added is 1260 mg / L.

[0008] Preferably, a metformin-containing wastewater treatment device is provided, the device comprising a disinfection tank and an aeration device positioned on the disinfection tank, an ultraviolet lamp, a raw material input device, an inlet and outlet circulation component and a stirring component;

[0009] The disinfection pool is a pool with an opening on the top;

[0010] The aeration device is positioned on the inner bottom of the disinfection tank, and the main body is a combination of an air pump and a plurality of nozzles, and transports air bubbles into the sewage in the disinfection tank under the control of the control unit;

[0011] The ultraviolet lamp is positioned in the disinfection pool and is used for disinfection when emitting light;

[0012] The raw material input device is fixed on the disinfection tank, and includes a silo and a material dividing and blocking assembly, and is used to input sewage treatment raw materials into the disinfection tank in a timely and quantitative manner under the control of the control unit;

[0013] The main body of the in-and-out circulation assembly is a combination of a pipe body and a pump body, which is positioned on the disinfection tank and is used to inject sewage to be treated into the disinfection tank and discharge the treated sewage;

[0014] The stirring assembly is positioned in the disinfection tank, and the main body is a combination of a rotating rod and a plurality of hard rod bodies fixed on the rotating rod. When the rotating rod rotates under the control of the control unit, the hard rod bodies stir the sewage in the disinfection tank.

[0015] Preferably, the disinfection tank comprises a container tank which is a container with an opening at the top and a tank at the bottom of the tank;

[0016] The pool bottom bin is a hollow column, fixed to the bottom of the container pool and positioned on the ground;

[0017] The doping bin is a box structure, fixed on the inner bottom of the pool bottom bin;

[0018] The raw material input device is fixed on the doping bin, and includes a bin and a material dividing and blocking assembly;

[0019] A stirring assembly and an aeration device are also positioned in the doping bin;

[0020] A rotating conveying assembly is positioned in the disinfection tank, including a central rotating column, a rotating driving assembly, a conveying pipe and a conveying stirring rod;

[0021] The central rotating column is a hollow column, arranged longitudinally, and rotates around its own axis;

[0022] The delivery pipe is a plurality of pipe bodies, which penetrate into the central rotating column, the bottom of which is connected with the inside of the doping chamber, and a pump body is positioned on the delivery pipe;

[0023] The number of the conveying stirring rods is 6 or more, and they are fixed on the side wall of the central rotating column;

[0024] The conveying stirring rod comprises an outer tube, an inner tube, a disinfection column and an annular water guide body;

[0025] The outer tube is a transparent hard tube, one end of which is fixed to the side wall of the central rotating column;

[0026] The inner tube is a transparent hard tube, one end of which is fixed to the side wall of the central rotating column;

[0027] A first tubular space is formed between the outer tube and the inner tube;

[0028] The disinfection column is a hollow cylinder with multiple ultraviolet lamps built in, and one end is fixed to the side wall of the central rotating column;

[0029] A second tubular space is formed between the inner tube and the disinfection column;

[0030] The annular water guide body is a hard ring body, with a C-shaped or U-shaped longitudinal section, the edge of which is fixed at the end of the inner tube away from the central rotating column, the inner ring diameter is the same as the inner diameter of the inner tube, the outer ring diameter is more than 2 cm larger than the outer diameter of the outer tube, and the opening faces the central rotating column;

[0031] The container pool has multiple disinfection columns longitudinally arranged therein, and the disinfection columns are transparent columns with multiple ultraviolet lamps built therein.

[0032] Preferably, a water-conducting soft sheet is also positioned on the annular water-conducting body. The water-conducting soft sheet is an annular rubber sheet with elasticity, and one side edge is fixed on the end face of the water-conducting soft sheet away from the inner tube;

[0033] The diameter of the edge of the water-conducting soft sheet fixed to the annular water-conducting body is 1.3 to 1.5 times the diameter of the edge on the other side;

[0034] After the water flows out of the first tubular space, it will impact the annular water guide body and the water guide soft sheet, and then impact the outer wall of the outer tube under the guidance of the water guide soft sheet;

[0035] When in use, the impact force of the output water flow is changed by controlling the output amount of liquid in the first tubular space per unit time, thereby causing the water-conducting soft film to deform to varying degrees, so that the water flow, under the guidance of the water-conducting soft film, focuses on impacting different areas of the outer wall of the outer tube.

[0036] Preferably, the water-conducting soft sheet is a double-layer structure, including an annular first sheet and an annular second sheet, the first sheet and the second sheet are both in the shape of a belt-shaped ring, one edge of the two sheets is fixed together, and the other edge is respectively fixed to the two edges of the end surface of the annular water-conducting body away from the inner tube;

[0037] The combination of the first sheet, the second sheet and the end surface of the annular water guide body is an annular body with a triangular longitudinal section, and the space inside the annular body is positioned as an annular space;

[0038] The annular space is filled with a filling elastic body, and the filling elastic body is a sponge;

[0039] A plurality of adsorption magnetic strips are fixed and evenly distributed on the surfaces of the first sheet and the second sheet in the annular space, and the adsorption magnetic strips are electromagnets;

[0040] The second sheet is closer to the outer tube than the first sheet, and the thickness of the second sheet is less than 0.6 times of the thickness of the first sheet, so it is more susceptible to deformation by force;

[0041] When in use, the deformation of the first sheet and the second sheet is controlled by turning on and off the power of the adsorbed magnetic strip, and the flow direction of the guided water is changed in coordination with the impact force of the water flow, so as to conveniently change the key flushing position.

[0042] Preferably, a space cover plate is positioned on the inner tube;

[0043] The disinfection cylinders are multiple and longitudinally arranged, and are evenly distributed around the axis of the central rotating cylinder on the circumference of the rotating conveying assembly and are located in the container pool;

[0044] The distance between the disinfection cylinder and the end of the inner tube is less than 20 cm;

[0045] The disinfection column comprises a base, a rotating column and a driving blade;

[0046] The base is cylindrical, and the bottom is fixed on the inner bottom of the container pool, which plays the role of bearing and positioning; the rotating column is a hollow transparent cylinder, with multiple ultraviolet lamps built in, arranged longitudinally, and the bottom is positioned on the top of the base, rotating around its own axis and connected to the base;

[0047] The driving blade is an impeller composed of three blades, fixed on the top of the rotating column, and the axis coincides with the axis of the rotating column; when water flow impacts the driving blade, the rotating column rotates;

[0048] The space cover plate includes an annular plate and a rotating connector;

[0049] The annular plate is a washer-shaped annular plate body, which is rotatably connected to the end of the inner tube through a rotating connector, and the end of the second tubular space is closed under normal conditions. When the fluid in the second tubular space rushes out, the impact annular plate rotates and sprays water toward the disinfection column to flush it;

[0050] During the rotation process, the water flow is guided to gradually flush the disinfection column from bottom to top; when the water flow impacts the driving blades, the disinfection column rotates;

[0051] The annular plate is densely covered with a plurality of water-permeable holes, which are through holes, and whose axial direction is the same as that of the annular plate.

[0052] Preferably, the rotating connector is located on the top of the annular plate;

[0053] Each water permeable hole corresponds to a water guide plate, which is a trumpet-shaped annular plate fixed on the surface of the annular plate away from the inner layer pipe;

[0054] One end of the water guide plate with a smaller diameter is fixed on the annular plate, and the water in the container pool enters the second tubular space through the water permeable hole.

[0055] Preferably, the rotating connector is a hinge with a torsion spring, and under the elastic force of the torsion spring, the annular plate is tightly attached to the inner tube and the disinfection column.

[0056] Preferably, the rotating connectors of the space cover plates on different inner layer tubes are located at different positions, so that the turbulence in the fluid in the container pool is more chaotic.

[0057] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0058] By adding aeration equipment and raw material feeding device to the disinfection pool with ultraviolet lamp in the existing sewage treatment process, stirring is performed during disinfection to mix sulfite into the sewage; oxygen in the air is used as a medium to realize the weak oxidant sulfite free radical (SO3· -, E0 = 0.63V, pH = 7) into sulfate radicals (SO4· - , E0=2.5~3.1V) and use it to treat metformin in sewage, which effectively solves the technical problems of poor efficiency, difficult operation, high risk and high cost in the prior art of treating sewage containing metformin, thereby achieving the technical effect of significant effect, simple and convenient, low risk, low cost and stable and reliable treatment of sewage containing metformin. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a simplified structural diagram of a wastewater treatment device containing metformin;

[0060] Figure 2 Schematic diagram of the internal structure of the container pool;

[0061] Figure 3 Schematic diagram of the positional relationship between the outer tube, the inner tube and the disinfection column;

[0062] Figure 4 This is a schematic diagram of the internal structure of the container pool;

[0063] Figure 5 It is a schematic diagram of the positional relationship between the annular water-conducting body and the water-conducting soft film;

[0064] Figure 6 It is a simplified structural diagram of the annular water-conducting body and the water-conducting film;

[0065] Figure 7 It is a schematic diagram of the positional relationship between the outer tube, the annular water-conducting body and the water-conducting soft film;

[0066] Figure 8 It is a schematic diagram of the structure of the water-conducting film;

[0067] Fig. 9 The figure is a schematic diagram of the internal structure of the water-conducting film;

[0068] Fig.10 It is a schematic diagram of the positional relationship between the space cover plate and the annular water guide body;

[0069] Fig.11 It is a schematic diagram of the position relationship between the space cover plate and the inner layer tube;

[0070] Fig.12 It is a schematic diagram of the rotation state of the space cover;

[0071] Fig.13 Schematic diagram of the degradation rate of metformin under different air aeration conditions;

[0072] Fig.14Schematic diagram of the degradation effect of metformin under different UV light intensities, where I represents the light intensity measured by the UV irradiator, which is 3896μW / cm2.

[0073] In the figure:

[0074] Disinfection tank 001, aeration equipment 002, ultraviolet lamp 003, raw material input device 004, inlet and outlet circulation component 005, stirring component 006, container tank 100, tank bottom bin 110, doping bin 120, central rotating column 210, rotating drive component 220, conveying pipe 230, pump body 231, outer tube 240, first tubular space 241, inner tube 250, second tubular space 251, disinfection column 260, annular water guide body 270, water guide soft film 280, first sheet body 281, second sheet body 282, adsorption magnetic strip 283, filling elastomer 284, annular plate 291, water permeable hole 292, water guide plate 293, rotating connector 294, disinfection column 300, base 310, rotating column 320, driving blade 330. DETAILED DESCRIPTION

[0075] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0076] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0077] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0078] Embodiment 1

[0079] The treatment method of metformin-containing sewage of the present application is specifically as follows: installing an aeration device 002 in a disinfection tank 001 provided with an ultraviolet lamp 003, an inlet and outlet circulation component 005, and a stirring component 006; adding sulfite into the disinfection tank 001 after the sewage enters the disinfection tank 001, so that the sulfite concentration in the sewage in the disinfection tank 001 reaches 630 mg / L to 1890 mg / L; and turning on the ultraviolet lamp 003, the aeration device 002, and the stirring component 006, stirring continuously for 20 minutes to 40 minutes, and then discharging the sewage in the disinfection tank 001 into the next process;

[0080] like Fig.13 and Fig.14 As shown, the oxygen in the air is used as a medium to realize the weak oxidant sulfite free radical (SO3· - , E0 = 0.63V, pH = 7) into sulfate radicals (SO4· - , E0 = 2.5 ~ 3.1V) and use it to treat metformin in sewage; in actual treatment, the ultraviolet intensity is strongly correlated with the treatment efficiency, and is also strongly correlated with the uniformity of the distribution of aeration gas and sulfite in sewage; after 10 minutes of treatment, the light emitted by the ultraviolet lamp becomes stronger, the contact area between gas and sewage increases, and the treatment efficiency (metformin degradation rate) will also increase accordingly.

[0081] Preferably, the sulfite added is sodium sulfite.

[0082] Preferably, the input amount of sulfite is 1260 mg / L.

[0083] Preferably, the above method can also be used for the degradation of drugs (ribavirin, chloroquine phosphate) in sewage.

[0084] The method for treating metformin-containing wastewater in the present application is equipped with a metformin-containing wastewater treatment device, such as Figure 1 As shown, the device includes a disinfection tank 001 and an aeration device 002, an ultraviolet lamp 003, a raw material input device 004, an in-and-out circulation component 005 and a stirring component 006 positioned on the disinfection tank 001;

[0085] The disinfection pool 001 is a pool with an opening at the top;

[0086] The aeration device 002 is positioned on the inner bottom of the disinfection tank 001, and its main body is a combination of an air pump and a plurality of nozzles, and it delivers air bubbles into the sewage in the disinfection tank 001 under the control of the control unit;

[0087] The ultraviolet lamp 003 is positioned in the disinfection pool 001 and is used for disinfection when emitting light;

[0088] The raw material input device 004 is fixed on the disinfection tank 001, and includes a material bin and a material dividing and blocking assembly, and is used to input sewage treatment raw materials into the disinfection tank 001 in a timely and quantitative manner under the control of the control unit;

[0089] The main body of the in-and-out circulation component 005 is a combination of a pipe body and a pump body, which is positioned on the disinfection tank 001 and is used to inject sewage to be treated into the disinfection tank 001 and discharge the treated sewage;

[0090] The stirring assembly 006 is positioned in the disinfection tank 001, and its main body is a combination of a rotating rod and a plurality of hard rod bodies fixed on the rotating rod. When the rotating rod rotates under the control of the control unit, the hard rod bodies stir the sewage in the disinfection tank 001 so that it is more fully mixed with the sewage treatment raw materials and sewage input by the raw material input device 004, thereby ensuring the sewage treatment effect.

[0091] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0092] The invention solves the technical problems in the prior art of poor treatment efficiency, great difficulty in operation, high risk and high cost of metformin-containing wastewater treatment, and achieves the technical effect of significant effect, simple and convenient, low risk, low cost and stable and reliable treatment of metformin-containing wastewater.

[0093] Embodiment 2

[0094] In order to further improve the degradation efficiency, avoid the ultraviolet light divergence affected by the dirt on the surface of the ultraviolet lamp 003, and realize the self-cleaning of the surface of the ultraviolet lamp 003; the embodiment of the present application optimizes and improves the metformin-containing sewage treatment device on the basis of the above embodiment, such as Figures 2 to 4 As shown, specifically:

[0095] The disinfection pool 001 includes a container pool 100 and a pool bottom bin 110; the container pool 100 is a container with an open top, used to store the sewage to be treated; the pool bottom bin 110 is a hollow column, fixed to the bottom of the container pool 100 and positioned on the ground, and used to accommodate the raw material input device 004 and the doping bin 120;

[0096] The doping bin 120 is a box structure with a hollow interior, fixed on the inner bottom of the pool bottom bin 110, and serves as a container for preliminary mixing of sewage treatment raw materials and sewage;

[0097] The raw material input device 004 is fixed on the doping bin 120, and includes a bin and a material dividing and blocking assembly, and is used to input sewage treatment raw materials into the doping bin 120 in a timely and quantitative manner under the control of the control unit;

[0098] The doping chamber 120 also contains a rod-shaped stirring assembly 006 and an aeration device 002 for pumping bubbles into the sewage.

[0099] A rotating conveying assembly is positioned in the disinfection tank 001, and the rotating conveying assembly plays the role of stirring and conveying sewage, including a central rotating column 210, a rotating driving assembly 220, a conveying pipe 230 and a conveying stirring rod;

[0100] The central rotating column 210 is a hollow column, arranged longitudinally, and rotates around its own axis under the drive of the rotating driving assembly 220; the rotating driving assembly 220 is fixed on the inner bottom of the container pool 100, and is preferably a combination of a motor, a gear and a gear ring;

[0101] The delivery pipe 230 is a plurality of pipes, which penetrate into the central rotating column 210, and the bottom is connected with the inside of the doping chamber 120. A pump body 231 for pumping is positioned on the delivery pipe 230;

[0102] The conveying and stirring rods are rod-shaped as a whole, with a number of 6 or more, fixed on the side wall of the central rotating column 210;

[0103] The conveying stirring rod includes an outer tube 240, an inner tube 250, a disinfection column 260 and an annular water guide 270;

[0104] The outer tube 240 is a transparent hard tube, one end of which is fixed to the side wall of the central rotating column 210, and the axis is perpendicular to the axis of the central rotating column 210;

[0105] The inner tube 250 is a transparent hard tube, one end of which is fixed on the side wall of the central rotating column 210, and the axis is perpendicular to the axis of the central rotating column 210. The inner tube 250 is equal in length to the outer tube 240 and is located inside the outer tube 240. A tubular space is formed between the outer tube 240 and the inner tube 250. For the convenience of description, this space is defined as the first tubular space 241.

[0106] The disinfection column 260 is a hollow cylinder, with multiple ultraviolet lamps 003 built in, one end of which is fixed on the side wall of the central rotating column 210, and the axis is perpendicular to the axis of the central rotating column 210. The disinfection column 260 is equal in length to the inner tube 250 and is located inside the inner tube 250; a tubular space is formed between the inner tube 250 and the disinfection column 260, and for the convenience of description, this space is defined as the second tubular space 251.

[0107] The annular water-guiding body 270 is a hard ring body with a thickness greater than 1 cm and a C-shaped or U-shaped longitudinal section. The edge is fixed at the end of the inner tube 250 away from the central rotating column 210. The inner circle diameter is the same as the inner diameter of the inner tube 250, and the outer circle diameter is more than 2 cm greater than the outer diameter of the outer tube 240. The opening faces the central rotating column 210. The annular water-guiding body 270 is used to guide the liquid from the first tubular space 241 to spray toward the outer wall of the outer tube 240 and then flush the outer wall of the outer tube 240 to avoid the dirt of the outer tube 240 affecting the disinfection effect of the ultraviolet lamp 003.

[0108] The container pool 100 has multiple disinfection columns 300 longitudinally arranged therein, and the disinfection columns 300 are transparent columns and have multiple ultraviolet lamps 003 built therein.

[0109] Preferably, in order to reduce the consumption of the ultraviolet lamp 003 , the disinfection column 260 is composed of a plurality of ultraviolet lamps 003 .

[0110] Preferably, the disinfection column 300 is composed of a plurality of ultraviolet lamps 003 spliced ​​together.

[0111] Embodiment 3

[0112] In order to further improve the cleaning effect of the outer wall of the outer tube 240, and further reduce the influence of dirt on the disinfection effect of the ultraviolet lamp, as Figures 6 to 8 As shown, a water-guiding film 280 is also positioned on the annular water-guiding body 270. The water-guiding film 280 is an annular rubber sheet with elastic force, and one edge is fixed on the end face of the water-guiding film 280 away from the inner tube 250. The diameter of the edge of the water-guiding film 280 fixed on the annular water-guiding body 270 is 1.3 to 1.5 times the diameter of the other edge. After the water flow is output from the first tubular space 241, it will impact the annular water-guiding body 270 and the water-guiding film 280, and then impact the outer wall of the outer tube 240 under the guidance of the water-guiding film 280. In actual use, the impact force of the output water flow can be changed by controlling the output amount of the liquid in the first tubular space 241 per unit time, thereby causing the water-guiding film 280 to deform to different degrees, so that the water flow, under the guidance of the water-guiding film 280, focuses on impacting different areas of the outer wall of the outer tube 240.

[0113] Embodiment 4

[0114] In order to make the direction of water flow guided by the water-guiding soft sheet 280 more controllable, the embodiment of the present application is optimized and improved on the basis of the above embodiment, such as Fig. 9 As shown, specifically:

[0115] The water-conducting soft sheet 280 is a double-layer structure, including an annular first sheet 281 and an annular second sheet 282. The first sheet 281 and the second sheet 282 are both band-shaped annular, one edge of the two is fixed together, and the other edge is respectively fixed on the two edges of the end face of the annular water-conducting body 270 away from the inner tube 250; the combination of the first sheet 281, the second sheet 282 and the end face of the annular water-conducting body 270 is a ring body with a triangular longitudinal section. For the convenience of description, the space inside the ring body is positioned as an annular space; the inside of the annular space is filled with a filling elastic body 284, which is a sponge; a plurality of adsorption magnetic strips 283 are fixed and evenly distributed on the surfaces of the first sheet 281 and the second sheet 282 in the annular space, and the adsorption magnetic strips 283 are electromagnets; the second sheet 282 is closer to the outer tube 240 than the first sheet 281, and the second sheet 282 is less than 0.6 times the thickness of the first sheet 281, and is more easily deformed by force. In actual use, the deformation of the first sheet 281 and the second sheet 282 can be controlled by turning the adsorption magnetic strip 283 on and off, thereby coordinating with the impact force of the water flow to change the flow direction of the guided water and conveniently change the key flushing position.

[0116] Embodiment 5

[0117] Considering that in the actual use process, in order to ensure the efficient operation of the ultraviolet lamp 003, the disinfection column 300 in the disinfection pool 001 needs to be cleaned regularly to prevent the accumulation of dust and dirt; however, the cleaning process is relatively cumbersome, requires manual participation, and is time-consuming and labor-intensive; in view of the above problems, the embodiment of the present application optimizes and improves the structure of the rotating conveying assembly and the disinfection column 300 on the basis of the above embodiment, so that the disinfection column 300 has a self-cleaning function; Figures 9 to 12 As shown, specifically:

[0118] A space cover is positioned on the inner tube 250;

[0119] There are multiple disinfection columns 300, which are arranged longitudinally and are evenly distributed around the axis of the central rotating column 210 on the circumference of the rotating conveying component and are located in the container pool 100; the spacing between the disinfection column 300 and the end of the inner layer tube 250 is less than 20 cm; the disinfection column 300 includes a base 310, a rotating column 320 and a driving blade 330; the base 310 is cylindrical, and the bottom is fixed on the inner bottom of the container pool 100, which plays a role in bearing and positioning; the rotating column 320 is a hollow transparent cylinder with multiple ultraviolet lamps 003 built in, which is arranged longitudinally and the bottom is positioned at the top of the base 310, rotating around its own axis and connected to the base 310; the driving blade 330 is an impeller composed of three blades, fixed on the top of the rotating column 320, and the axis coincides with the axis of the rotating column 320; when water flow impacts the driving blade 330, the rotating column 320 rotates.

[0120] The space cover plate includes an annular plate 291 and a rotating connector 294;

[0121] The annular plate 291 is a washer-shaped annular plate body, which is rotatably connected to the end of the inner tube 250 through the rotating connector 294. Under normal conditions, the end of the second tubular space 251 is closed. When the fluid in the second tubular space 251 rushes out, it impacts the annular plate 291 to rotate and spray water to the disinfection column 300 to flush it; during the rotation process, the water flow is guided to gradually flush the disinfection column 300 from bottom to top; when the water flow impacts the driving blade 330, the disinfection column 300 rotates, thereby achieving flushing without dead angles;

[0122] The rotating connecting body 294 is located on the top of the annular plate 291;

[0123] The annular plate 291 is densely covered with a plurality of water-permeable holes 292, which are through holes and have the same axial direction as the annular plate 291; each water-permeable hole 292 corresponds to a water guide plate 293, which is a trumpet-shaped annular plate fixed on the surface of the annular plate 291 away from the inner tube 250; one end of the water guide plate 293 with a smaller diameter is fixed on the annular plate 291, and the water in the container pool 100 enters the second tubular space 251 through the water-permeable hole 292.

[0124] Furthermore, the rotating connector 294 is a hinge with a torsion spring, and under the elastic force of the torsion spring, the annular plate 291 is tightly attached to the inner tube 250 and the disinfection column 260.

[0125] Preferably, the rotating connectors 294 of the space covers on different inner tubes 250 are located at different positions, so that the turbulence in the fluid in the container pool 100 is more chaotic, which is more conducive to stirring, mixing and aeration.

[0126] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for treating metformin-containing sewage, characterized in that: The method specifically comprises: installing an aeration device (002) in a disinfection tank (001) provided with an ultraviolet lamp (003), an inlet and outlet circulation component (005) and a stirring component (006); adding sulfite into the sewage after the sewage enters the disinfection tank (001) so that the sulfite concentration in the sewage in the disinfection tank (001) reaches 630 mg / L to 1890 mg / L; and turning on the ultraviolet lamp (003), the aeration device (002) and the stirring component (006), continuously stirring for 20 minutes to 40 minutes, and then discharging the sewage in the disinfection tank (001) into the next process; Equipped with a metformin-containing sewage treatment device, The aeration device (002) is mainly a combination of an air pump and a plurality of nozzles, and transports air bubbles into the sewage in the disinfection tank (001) under the control of a control unit; The ultraviolet lamp (003) is used for disinfection when emitting light; The raw material input device (004) comprises a material bin and a material dividing and blocking assembly, and is used to input sewage treatment raw materials into the disinfection tank (001) in a timely and quantitative manner under the control of the control unit; The main body of the in-and-out circulation component (005) is a combination of a pipe body and a pump body, which is positioned on the disinfection tank (001) and is used to inject sewage to be treated into the disinfection tank (001) and discharge the treated sewage; The main body of the stirring assembly (006) is a combination of a rotating rod and a plurality of hard rod bodies fixed on the rotating rod. When the rotating rod rotates under the control of the control unit, the hard rod bodies stir the sewage in the disinfection tank (001); The disinfection pool (001) comprises a container pool (100) which is a container with an opening at the top and a pool bottom bin (110); The pool bottom bin (110) is in the shape of a hollow cylinder, fixed to the bottom of the container pool (100) and positioned on the ground; The doping bin (120) is a box structure and is fixed on the inner bottom of the pool bottom bin (110); The raw material input device (004) is fixed on the doping bin (120), and comprises a bin and a material dividing and blocking assembly; A stirring assembly (006) and an aeration device (002) are also positioned in the doping bin (120); A rotating conveying assembly is positioned in the disinfection tank (001), comprising a central rotating column (210), a rotating driving assembly (220), a conveying pipe (230) and a conveying stirring rod; The central rotating column (210) is in the shape of a hollow column, arranged longitudinally, and rotates around its own axis; The delivery pipe (230) is a plurality of pipes, which penetrate into the central rotating column (210), and the bottom is connected with the inside of the doping bin (120). A pump body (231) is positioned on the delivery pipe (230); The number of the conveying stirring rods is 6 or more, and they are fixed on the side wall of the central rotating column (210); The conveying stirring rod comprises an outer tube (240), an inner tube (250), a disinfection column (260) and an annular water guide body (270); The outer tube (240) is a transparent hard tube, one end of which is fixed on the side wall of the central rotating column (210); The inner tube (250) is a transparent hard tube, one end of which is fixed on the side wall of the central rotating column (210); A first tubular space (241) is formed between the outer tube (240) and the inner tube (250); The disinfection column (260) is a hollow cylinder, with multiple ultraviolet lamps (003) built in, and one end is fixed to the side wall of the central rotating column (210); A second tubular space (251) is formed between the inner tube (250) and the disinfection column (260); The annular water guide body (270) is a hard ring body, with a C-shaped or U-shaped longitudinal section, the edge of which is fixed to the end of the inner tube (250) away from the central rotating column (210), the inner ring diameter is the same as the inner diameter of the inner tube (250), the outer ring diameter is greater than 2 cm of the outer diameter of the outer tube (240), and the opening faces the central rotating column (210); The container pool (100) has a plurality of disinfection columns (300) disposed longitudinally therein, and the disinfection columns (300) are transparent columns and have a plurality of ultraviolet lamps (003) therein.

2. The method for treating metformin-containing wastewater according to claim 1, wherein: The sulfite added is sodium sulfite; the amount of sulfite added is 1260 mg / L.

3. The method for treating metformin-containing wastewater according to claim 2, wherein: A water-conducting soft sheet (280) is also positioned on the annular water-conducting body (270). The water-conducting soft sheet (280) is an annular rubber sheet with elasticity, and one side edge is fixed on the end surface of the water-conducting soft sheet (280) away from the inner layer tube (250); The diameter of the edge of the water-conducting soft sheet (280) fixed to the annular water-conducting body (270) is 1.3 to 1.5 times the diameter of the edge on the other side; After being discharged from the first tubular space (241), the water flow will impact the annular water guide body (270) and the water guide soft sheet (280), and then impact the outer wall of the outer layer tube (240) under the guidance of the water guide soft sheet (280); When in use, the impact force of the output water flow is changed by controlling the output amount of the liquid in the first tubular space (241) per unit time, thereby causing the water-conducting soft sheet (280) to deform to different degrees, so that the water flow, under the guidance of the water-conducting soft sheet (280), focuses on impacting different areas of the outer wall of the outer tube (240).

4. The method for treating metformin-containing wastewater according to claim 3, wherein: The water-conducting soft sheet (280) is a double-layer structure, comprising an annular first sheet (281) and an annular second sheet (282); the first sheet (281) and the second sheet (282) are both in the form of a belt-shaped ring, one edge of the two are fixed together, and the other edge is respectively fixed to two edges of the end surface of the annular water-conducting body (270) away from the inner layer tube (250); The combination of the first sheet (281), the second sheet (282) and the end surface of the annular water-conducting body (270) forms an annular body with a triangular longitudinal section, and the space inside the annular body is positioned as an annular space; The annular space is filled with a filling elastic body (284), and the filling elastic body (284) is a sponge; A plurality of adsorption magnetic strips (283) are fixed and evenly distributed on the surfaces of the first sheet (281) and the second sheet (282) in the annular space, and the adsorption magnetic strips (283) are electromagnets; The second sheet (282) is closer to the outer tube (240) than the first sheet (281), and the thickness of the second sheet (282) is less than 0.6 times of the thickness of the first sheet (281), making it easier to deform under stress; When in use, the first sheet (281) and the second sheet (282) are deformed by turning the adsorbed magnetic strip (283) on and off, thereby changing the flow direction of the guided water in coordination with the impact force of the water flow, thereby conveniently changing the key flushing position.

5. The method for treating metformin-containing wastewater according to claim 4, characterized in that: A space cover plate is positioned on the inner tube (250); The disinfection cylinders (300) are multiple and longitudinally arranged, uniformly distributed around the axis of the central rotating cylinder (210) around the circumference of the rotating conveying assembly and located in the container pool (100); The distance between the disinfection column (300) and the end of the inner tube (250) is less than 20 cm; The disinfection column (300) comprises a base (310), a rotating column (320) and a driving blade (330); The base (310) is cylindrical, and its bottom is fixed on the inner bottom of the container pool (100), playing the role of bearing and positioning; the rotating column (320) is a hollow transparent cylinder, with multiple ultraviolet lamps (003) built in, arranged longitudinally, and its bottom is positioned on the top of the base (310), and is connected to the base (310) by rotating around its own axis; The driving blade (330) is an impeller composed of three blades, fixed on the top of the rotating column (320), and the axis thereof coincides with the axis of the rotating column (320); When water flow impacts the driving blade (330), the rotating column (320) rotates; The space cover plate comprises an annular plate (291) and a rotating connecting body (294); The annular plate (291) is a washer-shaped annular plate body, which is rotatably connected to the end of the inner tube (250) through a rotating connector (294), and the end of the second tubular space (251) is closed under normal conditions. When the fluid in the second tubular space (251) rushes out, it impacts the annular plate (291) to rotate and spray water toward the disinfection column (300) to flush it; During the rotation process, the water flow is guided to gradually flush the disinfection column (300) from bottom to top; when the water flow impacts the driving blade (330), the disinfection column (300) rotates; The annular plate (291) is densely covered with a plurality of water-permeable holes (292), and the water-permeable holes (292) are through holes, and the axial direction thereof is the same as the axial direction of the annular plate (291).

6. The method for treating metformin-containing wastewater according to claim 5, characterized in that: The rotating connecting body (294) is located on the top of the annular plate (291); Each water permeable hole (292) corresponds to a water guide plate (293), and the water guide plate (293) is a trumpet-shaped annular plate fixed on the surface of the annular plate (291) away from the inner layer tube (250); One end of the water guide plate (293) with a smaller diameter is fixed on the annular plate (291), and the water in the container pool (100) enters the second tubular space (251) through the water permeable hole (292).

7. The method for treating metformin-containing wastewater according to claim 6, wherein: The rotating connecting body (294) is a hinged leaf provided with a torsion spring. Under the elastic force of the torsion spring, the annular plate (291) is closely attached to the inner tube (250) and the disinfection column (260).

8. The method for treating metformin-containing wastewater according to claim 7, wherein: The positions of the rotating connectors (294) of the space covers on different inner layer tubes (250) are different, making the turbulence in the fluid in the container pool (100) more chaotic.

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