A mine wastewater denitrification and phosphorus removal treatment system and a denitrification and phosphorus removal treatment method

Abstract

The present invention belongs to the technical field of wastewater treatment, and provides a denitrification and phosphorus removal treatment system and method for mine wastewater. The denitrification and phosphorus removal treatment system for mine wastewater includes a grille channel, a sump, a coagulation and sedimentation unit, a magnetic coagulation and sedimentation unit, a magnetic separation and recovery unit, a deep treatment unit, a clear water tank and a disinfection tank; the coagulation and sedimentation unit includes a first coagulation tank, a first flocculation tank and a horizontal flow sedimentation tank; the magnetic coagulation and sedimentation unit includes a second coagulation tank, a magnetic seed mixing tank and a second flocculation tank; the magnetic separation and recovery unit includes a high-intensity magnetic separator and a magnetic recovery machine; the deep treatment unit includes an aerated biological filter and a sulfur autotrophic denitrification filter; the clear water tank is communicated with the sulfur autotrophic denitrification filter, the disinfection tank is communicated with the clear water tank, and a disinfection device is provided upstream of the disinfection tank. The present invention can effectively purify mine wastewater, has good removal effects on suspended solids, nitrogen, phosphorus and heavy metals in the wastewater, and has high treatment efficiency and good treatment effect on mine wastewater.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and particularly to a denitrification and dephosphorization treatment system and method for mine wastewater. Background Art

[0002] During the coal mining process, a large amount of mine wastewater is generated. If this mine wastewater is directly discharged into the environment without treatment, it will not only pollute the environment but also cause a large amount of water resource waste, restricting the production of the coal industry and the sustainable development of the mining area economy. Treating and utilizing mine sewage can not only prevent water resource loss, avoid polluting the water environment, but also alleviate the shortage of water supply in the mining area, which has important strategic significance for promoting the sustainable development of China's coal industry.

[0003] The suspended solid content of mine water is much higher than that of surface water, and its sensory properties are poor; moreover, the particle size of the contained suspended solids is small, the specific gravity is light, the sedimentation speed is slow, and the coagulation effect is poor; the total ion content in mine water is much higher than that of general surface water, and a large part of it is sulfate ions; mine water often contains different metal ions, increasing the difficulty of treatment. The traditional method for treating mine sewage is to discharge the mine sewage from the underground sump, collect it in the regulating tank on the ground, and use water treatment technologies such as sedimentation, filtration, and membrane treatment for sewage treatment. However, there are generally technical problems of low treatment efficiency and poor treatment effect, and it is difficult to meet the requirements of reclaimed water quality.

[0004] The invention patent with the patent number 201410208497.6 discloses a method for purifying and treating mine wastewater underground in a coal mine, including passing the mine wastewater underground in a coal mine through at least two gratings in a grating tank; the wastewater flows into the regulating tank by itself after passing through the gratings; the wastewater in the regulating tank is lifted to an anaerobic tank by a submersible sewage pump; the wastewater treated by the anaerobic tank flows into an anoxic tank by itself; the wastewater flowing through the anaerobic tank is discharged into an aerobic tank; the wastewater from the anaerobic tank and the nitrified mixed liquid refluxed from the aerobic tank are fully mixed in the anoxic tank, and a nitrification reaction is carried out under anoxic conditions; the wastewater flows into the aerobic tank by itself after passing through the anoxic tank to degrade the carbon-containing organic matter in the wastewater and nitrify the ammonia nitrogen in the wastewater. The above method for purifying and treating mine wastewater underground in a coal mine can denitrify and dephosphorize mine wastewater, saving water resources and avoiding environmental pollution. However, the above mine wastewater treatment process cannot stably and efficiently treat underground wastewater. Only by filtering the suspended solids in the wastewater through gratings, the filtering efficiency is low and the filtering effect is poor. By using different tank body environments such as anaerobic, anoxic, and aerobic to denitrify and dephosphorize the wastewater, the removal effect of nitrogen and phosphorus in the wastewater is poor, and it is difficult to effectively purify and treat the sewage. There is still a problem that the effluent does not meet the standards, and the treatment efficiency and treatment effect of mine wastewater are still difficult to meet the requirements for the treatment and reuse of mine wastewater. Summary of the Invention

[0005] In order to overcome the defects of the prior art pointed out above, the inventors of the present invention have conducted in-depth research on this. After a large amount of creative labor, the present invention has been completed.

[0006] Specifically, the technical problem to be solved by the present invention is: to provide a system and method for denitrifying and dephosphorizing mine wastewater treatment, so as to solve the technical problems that the current mine wastewater treatment method has low treatment efficiency for mine wastewater, poor purification effect, unqualified effluent, and difficulty in meeting the requirements of reclaimed water quality.

[0007] To solve the above technical problems, the technical solution of the present invention is:

[0008] A system for denitrifying and dephosphorizing mine wastewater, comprising

[0009] A grille channel, and at least two grille channels are provided;

[0010] A collecting tank, and the collecting tank is communicated with the water outlet of the grille channel;

[0011] A coagulation and sedimentation unit, which includes a first coagulation tank, a first flocculation tank and a horizontal flow sedimentation tank. The first coagulation tank is communicated with the collecting tank, the first coagulation tank, the first flocculation tank and the horizontal flow sedimentation tank are sequentially communicated, and a first chemical dosing device is also communicated upstream of the first coagulation tank and the first flocculation tank. The horizontal flow sedimentation tank is provided with a truss type scraping and sucking sludge machine, and the truss type scraping and sucking sludge machine is communicated with a sludge tank through a first sludge discharge pipeline;

[0012] A magnetic coagulation and sedimentation unit, which includes a second coagulation tank, a magnetic seed stirring tank and a second flocculation tank. The second coagulation tank is communicated with the horizontal flow sedimentation tank, and the second coagulation tank, the magnetic seed stirring tank and the second flocculation tank are sequentially communicated. A second chemical dosing device is also communicated upstream of the second coagulation tank and the second flocculation tank. The magnetic seed stirring tank is communicated with a magnetic powder conveying pipeline;

[0013] A magnetic separation and recovery unit, which includes a high-intensity magnetic separator and a magnetic recovery machine. The water inlet of the high-intensity magnetic separator is communicated with the second flocculation tank, the magnetic recovery machine is communicated with the sludge discharge port of the high-intensity magnetic separator, the sludge outlet of the magnetic recovery machine is communicated with the sludge tank through a second sludge discharge pipeline, and the magnetic powder outlet of the magnetic recovery machine is communicated with the magnetic powder conveying pipeline;

[0014] The advanced treatment unit, the advanced treatment unit includes an aerated biological filter and a sulfur autotrophic denitrification filter. The aerated biological filter is communicated with the water outlet of the high-intensity magnetic separator, and a biological filter media layer is arranged in the aerated biological filter. The sulfur autotrophic denitrification filter is communicated with the aerated biological filter, and a denitrification packing layer is arranged in the sulfur autotrophic denitrification filter. An aeration device is also communicated upstream of the aerated biological filter and the sulfur autotrophic denitrification filter. The backwash outlets of the aerated biological filter and the sulfur autotrophic denitrification filter are communicated with the sludge tank through a backwash outlet water pipeline;

[0015] A clear water tank, the clear water tank is communicated with the sulfur autotrophic denitrification filter. A backwash pump is arranged in the clear water tank. The backwash pump is communicated with a backwash water supply pipeline. The backwash pipeline is respectively communicated with the aerated biological filter and the sulfur autotrophic denitrification filter, and the water outlets of the backwash water supply pipeline respectively extend below the biological filter media layer and the denitrification packing layer; and

[0016] A disinfection tank, the disinfection tank is communicated with the clear water tank. A disinfection device is arranged upstream of the disinfection tank. The disinfection device is communicated with the disinfection tank through a disinfection pipeline.

[0017] As an improved technical solution, a first submersible sewage pump is arranged in the collecting tank. The first submersible sewage pump is communicated with a first water supply pipeline. The water outlet of the first water supply pipeline is communicated with the first coagulation tank;

[0018] A first intermediate water tank is arranged between the horizontal flow sedimentation tank and the second coagulation tank. The first intermediate water tank is located on one side of the horizontal flow sedimentation tank and is communicated with the horizontal flow sedimentation tank. A second submersible sewage pump is arranged in the first intermediate water tank. The second submersible sewage pump is communicated with a second water supply pipeline. The water outlet of the second water supply pipeline is communicated with the second coagulation tank;

[0019] The second flocculation tank is communicated with the water inlet of the high-intensity magnetic separator through a magnetic flocculation water outlet pipeline. A second intermediate water tank is arranged between the high-intensity magnetic separator and the aerated biological filter. The water outlet of the high-intensity magnetic separator is communicated with the second intermediate water tank through a magnetic separation water outlet pipeline. A third submersible sewage pump is arranged in the second intermediate water tank. The third submersible sewage pump is communicated with a third water supply pipeline. The water outlet of the third water supply pipeline is communicated with the bottom of the aerated biological filter;

[0020] A third intermediate water tank is provided between the aerated biological filter and the sulfur autotrophic denitrification filter. The aerated biological filter is communicated with the third intermediate water tank through a biological filter outlet pipeline. A fourth submersible pump is arranged in the third intermediate water tank. The fourth submersible pump is communicated with a fourth water supply pipeline. The water outlet of the fourth water supply pipeline is communicated with the bottom of the sulfur autotrophic denitrification filter. The sulfur autotrophic denitrification filter is communicated with the clear water tank through a denitrification filter outlet pipeline.

[0021] As an improved technical solution, the first chemical dosing device includes a first PAC dosing device and a first PAM dosing device. The first PAC dosing device is communicated with the first coagulation tank by a first PAC dosing pipeline, and a first mechanical stirring device is arranged in the first coagulation tank. The first PAM dosing device is communicated with the first flocculation tank by a first PAM dosing pipeline, and a second mechanical stirring device is arranged in the first flocculation tank.

[0022] As an improved technical solution, the second chemical dosing device includes a second PAC dosing device and a second PAM dosing device. The second PAC dosing device is communicated with the second coagulation tank by a second PAC dosing pipeline, and a third mechanical stirring device is arranged in the second coagulation tank. The magnetic powder outlet of the magnetic powder conveying pipeline extends into the magnetic seed stirring tank, and a fourth mechanical stirring device is arranged in the magnetic seed stirring tank. The second PAM dosing device is communicated with the second flocculation tank by a second PAM dosing pipeline, and a fifth mechanical stirring device is arranged in the second flocculation tank.

[0023] As an improved technical solution, the aeration device includes an aeration fan. A first aeration pipe network and a second aeration pipe network are respectively laid at the bottoms of the aerated biological filter and the sulfur autotrophic denitrification filter. The aeration fan is communicated with the first aeration pipe network and the second aeration pipe network respectively through an air supply pipeline.

[0024] As an improved technical solution, the magnetic recovery machine includes a machine body. One end of the machine body is provided with a magnetic sludge inlet, the other end of the machine body is provided with a magnetic powder discharge tank, and the bottom of the machine body is provided with a sludge outlet;

[0025] A rotating drum driven by a driving device is rotatably installed in the machine body. A lower arc plate is arranged below the rotating drum. The lower arc plate is fixedly installed on the machine body, and the lower arc plate is arranged close to the rotating drum and forms a muddy water channel with the rotating drum. One end of the muddy water channel is communicated with the magnetic sludge inlet, and the other end of the muddy water channel is communicated with the sludge outlet;

[0026] The machine body is also provided with a water equalizing mechanism, a magnetic scraping mechanism and a magnetic core. The water equalizing mechanism is located between the rotating cylinder and the magnetic mud inlet. The magnetic scraping mechanism is located between the rotating cylinder and the magnetic powder discharging groove. The magnetic core is fixedly installed on the machine body and is located inside the rotating cylinder. The magnetic core is provided with a magnetic area and a non-magnetic area. The magnetic area extends from the other end of the muddy water channel along the rotation direction of the rotating cylinder to the top of the rotating cylinder. The non-magnetic area corresponds to the magnetic scraping mechanism.

[0027] As an improved technical solution, the water equalizing mechanism includes a first distribution plate and a second distribution plate fixedly installed in the machine body. The first distribution plate is fixedly installed on the machine body and is correspondingly arranged with the magnetic mud inlet. A water equalizing channel is formed between the bottom end of the first distribution plate and the lower arc plate. The second distribution plate is located between the rotating cylinder and the first distribution plate. A strip-shaped hole is formed in the machine body. The second distribution plate is fixedly installed on the machine body by using positioning bolts passing through the strip-shaped hole, and the bottom of the second distribution plate is inclined along the direction close to the rotating cylinder.

[0028] As an improved technical solution, the magnetic scraping mechanism includes a magnetic powder receiving plate, a magnetic powder scraping plate and a pre-tightening assembly. The magnetic powder receiving plate is rotatably installed on the machine body through a rotating shaft. The magnetic powder scraping plate is fixedly connected with the magnetic powder receiving plate. The magnetic powder scraping plate is located between the magnetic powder receiving plate and the rotating cylinder. One end of the magnetic powder scraping plate close to the rotating cylinder abuts against the cylinder surface of the rotating cylinder. One end of the magnetic powder receiving plate far from the magnetic powder scraping plate is connected with the magnetic powder discharging groove.

[0029] The pre-tightening assembly includes a pre-tightening cylinder. The pre-tightening cylinder is hingedly installed outside the machine body. One end of the rotating shaft is connected with a shaft sleeve. The shaft sleeve has a connecting portion. The piston shaft end of the pre-tightening cylinder is hingedly connected with the connecting portion of the shaft sleeve.

[0030] An impact water pipe is further arranged in the machine body. The impact water pipe is located above the magnetic powder scraping plate, and the impact water pipe is correspondingly arranged with the magnetic scraping end of the magnetic powder scraping plate. A plurality of water outlet and magnetic impact holes are uniformly formed in one side of the impact water pipe facing the magnetic scraping end of the magnetic powder scraping plate.

[0031] As an improved technical solution, the magnetic core includes a magnetic inner cylinder and a magnet. The magnetic inner cylinder is rotatably installed on the machine body, and a magnetic angle adjusting plate is fixedly installed at one end of the magnetic inner cylinder. The magnetic angle adjusting plate is fixedly connected with the machine body by using positioning bolts. A plurality of magnets are provided. The plurality of magnets are sequentially fixedly installed on the outer cylinder wall of the magnetic inner cylinder, and the plurality of magnets form the magnetic area.

[0032] And / or, a baffle is provided on one side of the lower arc plate facing the rotating cylinder. The baffles are respectively arranged near the two side edges of the lower arc plate, and the baffles are adapted to the radian of the lower arc plate. The side of the baffle near the rotating cylinder abuts against the outer cylinder wall of the rotating cylinder;

[0033] And / or, a muddy water collection cavity is provided below the sludge outlet end of the lower arc plate of the machine body. The bottom of the muddy water collection cavity is of an inverted trapezoidal structure. The sludge outlet is communicated with the muddy water collection cavity. A water discharge port is arranged at the middle position of the bottom of the lower arc plate. A water discharge pipe is communicated between the water discharge port and the sludge outlet, and an emptying valve is arranged on the water discharge pipe.

[0034] The present invention also discloses a method for denitrifying and dephosphorizing mine wastewater by using the above-mentioned mine wastewater denitrifying and dephosphorizing treatment system, which includes the following steps:

[0035] S1. Convey the mine wastewater to the grid channel. After the wastewater removes larger sundries through the grid channel, it flows into the collection pool by gravity;

[0036] S2. Convey the wastewater in the collection pool to the first coagulation tank. At the same time, the first PAC dosing device adds polyaluminum chloride coagulant to the first coagulation tank, and uses the first mechanical stirring device to stir and mix the wastewater and the medicament;

[0037] S3. The wastewater in the first coagulation tank flows into the first flocculation tank. At the same time, the first PAM dosing device adds polyacrylamide flocculant to the first flocculation tank, and uses the second mechanical stirring device to stir and mix the wastewater and the medicament;

[0038] S4. The wastewater in the first flocculation tank flows into the horizontal flow sedimentation tank. After sedimentation in the horizontal flow sedimentation tank, the wastewater flows into the first intermediate water tank. The sludge sedimented to the bottom of the horizontal flow sedimentation tank is pumped into the sludge tank by the truss type scraping and sucking sludge machine;

[0039] S5. Convey the wastewater in the first intermediate water tank to the second coagulation tank. At the same time, the second PAC dosing device adds polyaluminum chloride coagulant to the second coagulation tank, and uses the third mechanical stirring device to stir and mix the wastewater and the medicament;

[0040] S6. The wastewater in the second coagulation tank flows into the magnetic seed stirring tank. At the same time, magnetic powder is added to the magnetic seed stirring tank, and the fourth mechanical stirring device is used to stir and mix the wastewater and the magnetic powder;

[0041] S7. The wastewater in the magnetic seed mixing tank flows into the second flocculation tank. Meanwhile, the second PAM dosing device adds polyacrylamide flocculant into the second flocculation tank, and the fifth mechanical stirring device is used to stir and mix the wastewater and the reagent.

[0042] S8. The wastewater in the second flocculation tank flows into the high-intensity magnetic separator. After solid-liquid separation in the high-intensity magnetic separator, the wastewater flows into the second intermediate water tank, and the magnetic sludge containing magnetic seeds is transported to the magnetic recovery machine. In the magnetic recovery machine, the magnetic seeds and the sludge are dispersed and the magnetic seeds are recovered. The recovered magnetic powder is re-transported into the magnetic seed mixing tank, and the separated non-magnetic sludge is discharged to the sludge tank.

[0043] S9. The wastewater in the second intermediate water tank is transported to the biological aerated filter. Meanwhile, the aeration device conveys air into the biological aerated filter, and the oxidation and denitrification reactions of ammonia nitrogen are completed in the biological aerated filter. The wastewater treated by the biological aerated filter flows into the third intermediate water tank.

[0044] S10. The wastewater in the third intermediate water tank is transported to the sulfur autotrophic denitrification filter. Meanwhile, the aeration device conveys air into the sulfur autotrophic denitrification filter, and the removal of TN is completed in the sulfur autotrophic denitrification filter. The water body treated by the sulfur autotrophic denitrification filter flows into the clear water tank.

[0045] S11. The water body in the clear water tank flows into the disinfection tank. Meanwhile, the disinfection device adds medicine for disinfection treatment into the disinfection tank, and after killing the harmful bacteria in the water body, it is discharged.

[0046] S12. The supernatant liquid at the top of the sludge tank flows back to the collection tank again, and the sludge at the bottom of the sludge tank is regularly cleaned and transported out.

[0047] After adopting the above technical solution, the beneficial effects of the present invention are:

[0048] This mine wastewater denitrification and phosphorus removal treatment system, when operating, first removes larger debris in the wastewater through the grille channel. Then, the wastewater enters the coagulation and sedimentation unit through the collection tank. The suspended substances and plankton in the wastewater are aggregated together to form flocs in the first coagulation tank and the first flocculation tank, and the rapid sedimentation of the flocs in the wastewater is achieved in the horizontal flow sedimentation tank. The sludge deposited at the bottom of the horizontal flow sedimentation tank is pumped into the sludge tank by the overhead crane type scraping and sucking sludge machine. After that, the wastewater enters the magnetic coagulation and sedimentation unit, and high-efficiency flocculation of various pollutants such as suspended solids, COD, organic matter, phosphorus, and heavy metals in the wastewater is achieved through the second coagulation tank, the magnetic seed mixing tank, and the second flocculation tank, forming high-density flocs with magnetic seeds as the core. At the same time, the specific gravity of the flocs is increased to achieve the rapid sedimentation of the flocs. After magnetic flocculation, the wastewater enters the magnetic separation and recovery unit, and the solid-liquid separation of the wastewater is achieved through the high-intensity magnetic separator. The sludge containing magnetic seeds is separated from the wastewater and sent to the magnetic recovery machine. The magnetic powder is recovered by the magnetic recovery machine and re-fed into the magnetic seed mixing tank for recycling, and the sludge from which the magnetic powder is separated is discharged into the sludge tank. The wastewater treated by the high-intensity magnetic separator enters the advanced treatment unit, and the oxidation and denitrification reaction of ammonia nitrogen are completed through the biological aerated filter. The ammonia nitrogen in the wastewater is oxidized into nitrite and further oxidized into nitrate, and is converted into nitrogen gas and released into the atmosphere through the denitrification reaction. After that, the NO3 - -N in the wastewater is reduced to N2 and released into the atmosphere, finally achieving the removal of TN. Finally, the clear water flows into the clear water tank, and after passing through the clear water tank, it flows into the disinfection tank, and is subjected to chemical dosing and disinfection treatment in the disinfection tank and then recycled or discharged.

[0049] Through this mine wastewater denitrification and phosphorus removal treatment system, effective purification treatment of mine wastewater can be achieved, with good removal effects on suspended solids, nitrogen, phosphorus, and heavy metals in the wastewater, high treatment efficiency for mine wastewater, good treatment effects, and the treated wastewater meeting the treatment and reuse requirements of mine wastewater, having good economic benefits and industrial application potential. Brief Description of the Drawings

[0050] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts do not necessarily draw according to the actual ratio.

[0051] Figure 1 It is the process flow diagram of the mine wastewater denitrification and phosphorus removal treatment system of the present invention;

[0052] Figure 2 It is the process flow diagram of the grille channel, the collection tank, and the coagulation and sedimentation unit of the present invention;

[0053] Figure 3 This is the process flow diagram of the magnetic coagulation sedimentation unit and the magnetic separation and recovery unit of the present invention;

[0054] Figure 4 This is the process flow diagram of the advanced treatment unit, clear water tank and disinfection tank of the present invention;

[0055] Figure 5 This is the structural schematic diagram of the magnetic recovery machine of the present invention;

[0056] Figure 6 This is another three-dimensional structural schematic diagram of the magnetic recovery machine of the present invention;

[0057] Figure 7 This is the sectional structural schematic diagram of the magnetic recovery machine of the present invention;

[0058] Figure 8 This is another sectional structural schematic diagram of the magnetic recovery machine of the present invention;

[0059] Figure 9 This is yet another sectional structural schematic diagram of the magnetic recovery machine of the present invention;

[0060] Figure 10 is Figure 9 the enlarged structural schematic diagram of part I in

[0061] Figure 11 This is the structural schematic diagram of the magnetic core of the present invention;

[0062] Reference numerals:

[0063] 1 - grille channel; 2 - collecting tank;

[0064] 3 - first coagulation tank; 4 - first flocculation tank; 5 - horizontal flow sedimentation tank; 6 - first submersible pump; 7 - first water supply pipeline; 8 - first PAC dosing device; 9 - first PAM dosing device; 10 - first PAC dosing pipeline; 11 - first mechanical stirring device; 12 - first PAM dosing pipeline; 13 - second mechanical stirring device; 14 - truss type scraping and sucking sludge machine; 15 - first sludge discharge pipeline;

[0065] 16 - first intermediate tank; 17 - second submersible pump; 18 - second water supply pipeline;

[0066] 19 - second coagulation tank; 20 - magnetic seed stirring tank; 21 - second flocculation tank; 22 - second PAC dosing device; 23 - second PAM dosing device; 24 - second PAC dosing pipeline; 25 - third mechanical stirring device; 26 - magnetic powder conveying pipeline; 27 - fourth mechanical stirring device; 28 - second PAM dosing pipeline; 29 - fifth mechanical stirring device;

[0067] 30 - high-intensity magnetic separator; 31 - magnetic flocculation water outlet pipeline;

[0068] 32 - Magnetic recovery machine; 321 - Machine body; 32101 - Magnetic sludge inlet; 32102 - Magnetic powder discharge tank; 32103 - Sludge outlet; 322 - Rotary drum; 323 - Reducing motor; 324 - Transmission box; 325 - Driving gear; 326 - Driven gear; 327 - Transmission chain; 328 - Lower arc plate; 329 - First uniform distribution plate; 3210 - Second uniform distribution plate; 3211 - Magnetic powder receiving plate; 3212 - Magnetic powder scraping plate; 3213 - Rotating shaft; 3214 - Pre - tightening cylinder; 3215 - Bush; 3216 - Locking bolt; 3217 - Limit baffle; 3218 - Flushing pipe; 3219 - Inner magnetic cylinder; 3220 - Magnetic angle adjustment plate; 3221 - Magnet; 3222 - Baffle; 3223 - Mud - water collecting cavity; 3224 - Drain pipe; 3225 - Drain valve; 3226 - Lifting plate; 3227 - Handle

[0069] 33 - Second sludge discharge pipeline; 34 - Second intermediate water tank; 35 - Magnetic separation water outlet pipeline; 36 - Third submersible sewage pump; 37 - Third water supply pipeline

[0070] 38 - Aerated biological filter; 39 - Sulfur autotrophic denitrification filter; 40 - Biological filter media layer; 41 - Denitrification packing layer; 42 - Backwashing water outlet pipeline

[0071] 43 - Third intermediate water tank; 44 - Biological filter water outlet pipeline; 45 - Fourth submersible sewage pump; 46 - Fourth water supply pipeline

[0072] 47 - Aeration blower; 48 - First aeration pipe network; 49 - Second aeration pipe network; 50 - Air supply pipeline

[0073] 51 - Clear water tank; 52 - Denitrification filter water outlet pipeline; 53 - Backwashing pump; 54 - Backwashing water supply pipeline

[0074] 55 - Disinfection tank; 56 - Disinfection device; 57 - Disinfection pipeline

[0075] 58 - Sludge tank Detailed implementation manners

[0076] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0077] It should be noted that all the directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0078] At the same time, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously.

[0079] In addition, in the present invention, descriptions such as "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0080] As Figures 1 to 4 As commonly shown, this embodiment provides a mine wastewater denitrification and dephosphorization treatment system, which includes a grille channel 1, a sump 2, a coagulation and sedimentation unit, a magnetic coagulation and sedimentation unit, a magnetic separation and recovery unit, a deep treatment unit, a clean water tank 51, and a disinfection tank 55; after the mine wastewater passes through the grille channel 1, the sump 2, the coagulation and sedimentation unit, the magnetic coagulation and sedimentation unit, the magnetic separation and recovery unit, the deep treatment unit, the clean water tank 51, and the disinfection tank 55 in sequence, the effluent reaches the external discharge standard and reuse requirements and can be externally discharged or recycled and utilized.

[0081] The grille channel 1 is provided with at least two channels. The sump 2 is communicated with the water outlet of the grille channel 1. After the mine wastewater removes larger sundries through the grille channel 1, it flows into the sump 2 by gravity.

[0082] In this embodiment, the grille channel 1 is provided with two channels. One of them is a coarse grille with a bar gap of 50 - 100 mm, which can remove larger solid wastes and floating matters in the wastewater. The other one is a fine grille with a bar gap of 10 - 50 mm, which further removes smaller solid impurities and suspended matters in the sewage.

[0083] As Figures 1 to 4As commonly shown, the coagulation and sedimentation unit includes a first coagulation tank 3, a first flocculation tank 4, and a horizontal flow sedimentation tank 5. The first coagulation tank 3 is connected to the collection tank 2, the first coagulation tank 3, the first flocculation tank 4, and the horizontal flow sedimentation tank 5 are connected in sequence, and a first chemical dosing device is also connected upstream of the first coagulation tank 3 and the first flocculation tank 4. The horizontal flow sedimentation tank 5 is equipped with a truss type scraping and sucking sludge machine 14, and the truss type scraping and sucking sludge machine 14 is connected to a sludge tank 58 through a first sludge discharge pipeline 15.

[0084] In this embodiment, the collection tank 2, the first coagulation tank 3, the first flocculation tank 4, the horizontal flow sedimentation tank 5, and the first intermediate water tank 16 are arranged side by side in sequence.

[0085] In this embodiment, a first submersible sewage pump 6 is provided in the collection tank 2. The first submersible sewage pump 6 is connected to a first water supply pipeline 7. The outlet of the first water supply pipeline 7 is connected to the first coagulation tank 3. When the first submersible sewage pump 6 operates, the wastewater in the collection tank 2 is transported to the first coagulation tank 3 through the first water supply pipeline 7.

[0086] The first chemical dosing device includes a first PAC dosing device 8 and a first PAM dosing device 9. The first PAC dosing device 8 is connected to the first coagulation tank 3 by using a first PAC dosing pipeline 10 to add polyaluminum chloride coagulant into the first coagulation tank 3. And a first mechanical stirring device 11 is provided in the first coagulation tank 3. The first PAM dosing device 9 is connected to the first flocculation tank 4 by using a first PAM dosing pipeline 12 to add polyacrylamide coagulant into the first flocculation tank 4. And a second mechanical stirring device 13 is provided in the first flocculation tank 4.

[0087] Polyaluminum chloride coagulant is an inorganic polymer compound used in the coagulation and flocculation processes of wastewater treatment. It has strong flocculation ability and can effectively remove suspended solids, turbidity, and organic substances in sewage. It has good coagulation performance and can form large and dense flocs in a short time, facilitating sedimentation and filtration. Polyacrylamide coagulant is a polymer organic compound with excellent flocculation and degradation performance. It can form flocs with suspended solids and organic substances in sewage and promote their rapid sedimentation. In addition, polyacrylamide coagulant can also effectively improve the filtration performance of water bodies and enhance the clarity of water quality.

[0088] Polyaluminum chloride coagulant is suitable for treating water bodies with high turbidity and organic substances. It can quickly flocculate suspended solids and organic substances and form large flocs. Polyacrylamide coagulant is suitable for treating water bodies with more fine particles and colloidal substances. It can effectively aggregate fine particles into larger clusters, promote rapid sedimentation and filtration, improve the rheological properties of water bodies, and reduce the viscosity of water.

[0089] While the wastewater enters the first coagulation tank 3, the first PAC dosing device 8 adds polyaluminum chloride coagulant into the first coagulation tank 3 through the first PAC dosing pipeline 10. The polyaluminum chloride coagulant can increase the chemical reaction speed and opportunities of the particulate matters in the wastewater, thereby promoting the aggregation of suspended particles, achieving the flocculation of higher turbidity and organic substances in the first coagulation tank 3, and then the wastewater flows by gravity into the first flocculation tank 4. At the same time, the first PAM dosing device 9 adds polyacrylamide coagulant into the first flocculation tank 4 through the first PAM dosing pipeline 12. The polyacrylamide coagulant can aggregate the suspended substances and plankton in the wastewater together to form larger clusters, achieve the aggregation of the remaining fine particles in the first flocculation tank 4, promote rapid sedimentation at the same time, and improve the rheological properties of the water body. After that, the wastewater flows by gravity from the first flocculation tank 4 into the horizontal flow sedimentation tank 5.

[0090] The first mechanical stirring device 11 provided in the first coagulation tank 3 and the second mechanical stirring device 13 provided in the first flocculation tank 4 can make the added medicaments and the wastewater mix fully, accelerate the efficiency of coagulation and flocculation, and improve the effect of coagulation and flocculation.

[0091] After the wastewater flows by gravity into the horizontal flow sedimentation tank 5, the sewage stays in the inlet area for a period of time, so that the suspended substances and particulate matters in the wastewater begin to precipitate to the sedimentation area; the sedimentation area is a deeper area, and the suspended substances and particulate matters in the wastewater will precipitate to the bottom to form a layer of sludge, while the outlet area is a shallower area, and the purified water body flows out from here.

[0092] As Figures 1 to 4 As commonly shown, the magnetic coagulation sedimentation unit includes a second coagulation tank 19, a magnetic seed stirring tank 20 and a second flocculation tank 21. The second coagulation tank 19, the magnetic seed stirring tank 20 and the second flocculation tank 21 are arranged side by side in sequence. The second coagulation tank 19 is communicated with the horizontal flow sedimentation tank 5, and the second coagulation tank 19, the magnetic seed stirring tank 20 and the second flocculation tank 21 are communicated in sequence. A second dosing device is also communicated upstream of the second coagulation tank 19 and the second flocculation tank 21, and the magnetic seed stirring tank 20 is communicated with a magnetic powder conveying pipeline 26.

[0093] A first intermediate water tank 16 is provided between the horizontal flow sedimentation tank 5 and the second coagulation tank 19. The first intermediate water tank 16 is located on one side of the horizontal flow sedimentation tank 5 and is communicated with the horizontal flow sedimentation tank 5. The first intermediate water tank 16 is used to realize the temporary storage of the wastewater treated by the horizontal flow sedimentation tank 5. A second submersible sewage pump 17 is provided in the first intermediate water tank 16. The second submersible sewage pump 17 is communicated with a second water supply pipeline 18. The outlet of the second water supply pipeline 18 is communicated with the second coagulation tank 19. When the second submersible sewage pump 17 works, the wastewater in the first intermediate water tank 16 is conveyed to the second coagulation tank 19 through the second water supply pipeline 18.

[0094] The second chemical dosing device includes a second PAC dosing device 22 and a second PAM dosing device 23. The second PAC dosing device 22 is connected to the second coagulation tank 19 through a second PAC dosing pipeline 24 for adding polyaluminum chloride coagulant into the second coagulation tank 19. A third mechanical stirring device 25 is provided in the second coagulation tank 19. The magnetic powder outlet of the magnetic powder conveying pipeline 26 extends into the magnetic seed stirring tank 20 for adding magnetic powder into the magnetic seed stirring tank 20. A fourth mechanical stirring device 27 is provided in the magnetic seed stirring tank 20. The second PAM dosing device 23 is connected to the second flocculation tank 21 through a second PAM dosing pipeline 28 for adding polyacrylamide coagulant into the second flocculation tank 21. A fifth mechanical stirring device 29 is provided in the second flocculation tank 21.

[0095] When the wastewater enters the second coagulation tank 19 from the first intermediate water tank 16, the second PAC dosing device 22 adds polyaluminum chloride coagulant into the second coagulation tank 19 through the second PAC dosing pipeline 24. At the same time, the third mechanical stirring device 25 realizes the full stirring and mixing of the polyaluminum chloride coagulant and the wastewater. Then, the wastewater flows into the magnetic seed stirring tank 20 by gravity. At the same time, magnetic powder is added into the magnetic seed stirring tank 20 through the magnetic powder conveying pipeline 26, and the fourth mechanical stirring device 27 is used to realize the full stirring and mixing of the magnetic powder and the wastewater. After that, the wastewater flows into the second flocculation tank 21 by gravity. At the same time, the second PAM dosing device 23 adds polyacrylamide coagulant into the second flocculation tank 21 through the second PAM dosing pipeline 28, and the fifth mechanical stirring device 29 is used to realize the full mixing of the polyacrylamide coagulant and the wastewater.

[0096] The wastewater enters the magnetic coagulation sedimentation unit. By adding coagulant, magnetic seeds and coagulant aid into the wastewater and fully stirring and mixing them, during the flocculation process, high-density flocs with magnetic seeds as the core are formed. At the same time, the specific gravity of the flocs is increased, so that the flocs containing various pollutants such as suspended solids, COD, organic matter, phosphorus, heavy metals, etc. can settle quickly, thus achieving the purpose of efficient pollution removal. The ionic polarity and metal characteristics of the magnetic seeds, as the core of the flocs, greatly enhance the flocculation binding ability to suspended pollutants in the wastewater, greatly reduce the dosage of coagulant, and have good effects in removing suspended solids, especially in removing phosphorus, bacteria, viruses, oil, heavy metals, chromaticity, turbidity, deodorization, suspended solids, etc. It can effectively remove the suspended pollutants that cannot be removed by the coagulation sedimentation unit in the wastewater. Since the specific gravity of the magnetic seeds is as high as 5.0×103 kg / m3, the specific gravity of the flocs mixed with magnetic seeds increases, and the flocs settle quickly, with a speed of more than 40 m / h. The wastewater treatment of the entire magnetic coagulation sedimentation unit can be completed in about 15 minutes from inlet to outlet, and the wastewater treatment efficiency is high.

[0097] In this embodiment, the structures of the first mechanical stirring device 11, the second mechanical stirring device 13, the third mechanical stirring device 25, the fourth mechanical stirring device 27, and the fifth mechanical stirring device 29 are the same. The mechanical stirring devices in this embodiment all include a stirring motor. The output shaft of the stirring motor is connected to a stirring shaft, and a plurality of stirring blades are arranged along the axial direction of the stirring shaft. When the stirring motor works, it drives the stirring shaft and the stirring blades to rotate, realizing the stirring of the wastewater.

[0098] As Figures 1 to 4 Collectively shown, the magnetic separation and recovery unit includes a high-intensity magnetic separator 30 and a magnetic recovery machine 32. The water inlet of the high-intensity magnetic separator 30 is connected to the second flocculation tank 21. The magnetic recovery machine 32 is connected to the sludge discharge port of the high-intensity magnetic separator 30. The sludge outlet 32103 of the magnetic recovery machine 32 is connected to the sludge tank 58 through the second sludge discharge pipeline 33. The magnetic powder outlet of the magnetic recovery machine 32 is connected to the magnetic powder conveying pipeline 26.

[0099] The second flocculation tank 21 is connected to the water inlet of the high-intensity magnetic separator 30 through the magnetic flocculation water outlet pipeline 31. There is a second intermediate water tank 34 between the high-intensity magnetic separator 30 and the biological aerated filter 38. The water outlet of the high-intensity magnetic separator 30 is connected to the second intermediate water tank 34 through the magnetic separation water outlet pipeline 35. The first intermediate water tank 16 is used to temporarily store the wastewater treated by the high-intensity magnetic separator 30. A third submersible pump 36 is provided in the second intermediate water tank 34, and the third submersible pump 36 is connected to a third water supply pipeline 37.

[0100] The wastewater is transported from the second flocculation tank 21 to the high-intensity magnetic separator 30 through the magnetic flocculation water outlet pipeline 31. The high-intensity magnetic separator 30 uses a high-intensity magnetic field to make the flocs move directionally and be scraped out on the surface of the magnetic disk, realizing the solid-liquid separation of the wastewater, thereby purifying the water body. The purified water body flows into the second intermediate water tank 34 through the magnetic separation water outlet pipeline 35. The sludge containing magnetic seeds scraped out from the high-intensity magnetic separator 30 enters the magnetic recovery machine 32 for the dispersion of magnetic seeds and sludge and the dilution and recovery of magnetic seeds.

[0101] As Figures 5 to 11As commonly shown, the magnetic recovery machine 32 includes a machine body 321. One end of the machine body 321 is provided with a magnetic sludge inlet 32101, and the magnetic sludge inlet 32101 is communicated with the sludge discharge port of the high-intensity magnetic separator 30. The other end of the machine body 321 is provided with a magnetic powder discharge tank 32102, and the magnetic powder outlet of the magnetic powder discharge tank 32102 is communicated with the magnetic powder conveying pipeline 26. The bottom of the machine body 321 is provided with a sludge outlet 32103, and the sludge outlet 32103 is communicated with the second sludge discharge pipeline 33. A rotating drum 322 driven by a driving device is rotatably installed in the machine body 321. A lower arc plate 328 is arranged below the rotating drum 322. The lower arc plate 328 is fixedly installed on the machine body 321, and the lower arc plate 328 is arranged close to the rotating drum 322 and forms a muddy water channel with the rotating drum 322. One end of the muddy water channel is communicated with the magnetic sludge inlet 32101, and the other end of the muddy water channel is communicated with the sludge outlet 32103. A water equalizing mechanism, a magnetic scraping mechanism and a magnetic core are further arranged in the machine body 321. The water equalizing mechanism is located between the rotating drum 322 and the magnetic sludge inlet 32101. The magnetic scraping mechanism is located between the rotating drum 322 and the magnetic powder discharge tank 32102. The magnetic core is fixedly installed on the machine body 321 and is located inside the rotating drum 322. The magnetic core is provided with a magnetic area and a non-magnetic area. The magnetic area extends from the other end of the muddy water channel along the rotation direction of the rotating drum 322 to the top of the rotating drum 322, and the non-magnetic area corresponds to the magnetic scraping mechanism.

[0102] In this embodiment, the driving device includes a reduction motor 323. A transmission box 324 is fixedly installed outside the machine body 321. The reduction motor 323 is fixedly installed on the transmission box 324. A driving gear 325 is installed on the output shaft of the reduction motor 323. One end of the rotating drum 322 is installed with a driven gear 326. A transmission chain 327 is wound between the driven gear 326 and the driving gear 325, and the driving gear 325 is in transmission connection with the driven gear 326 through the transmission chain 327. The transmission box 324 covers the driving gear 325, the driven gear 326 and the transmission chain 327, playing a role in dust prevention and safety protection.

[0103] The water equalizing mechanism includes a first water distribution plate 329 and a second water distribution plate 3210 fixedly installed inside the machine body 321. The first water distribution plate 329 is fixedly installed on the machine body 321 and is arranged corresponding to the magnetic sludge water inlet 32101. A water equalizing channel is formed between the bottom end of the first water distribution plate 329 and the lower arc plate 328. The second water distribution plate 3210 is located between the rotating drum 322 and the first water distribution plate 329. A strip-shaped hole is formed on the machine body 321. The second water distribution plate 3210 is fixedly installed on the machine body 321 by using positioning bolts passing through the strip-shaped hole, and the bottom of the second water distribution plate 3210 is inclined in the direction close to the rotating drum 322. Loosening the positioning bolts can adjust the second water distribution plate 3210 in the direction of approaching / away from the first water distribution plate 329. After the adjustment is completed, just tighten the positioning bolts again. With the provided water equalizing mechanism, the first water distribution plate 329 blocks the water inlet of the magnetic sludge water inlet 32101 and ensures that the inlet water flows evenly and gently through the water equalizing channel. The second water distribution plate 3210 plays a role in blocking water and guiding the flow, avoiding the scouring of the adsorbed magnetic powder on the rotating drum 322 by the muddy water, and at the same time facilitating the diversion of the muddy water into the muddy water channel. Through this water equalizing mechanism, the treatment effect of the magnetic muddy water can be greatly improved.

[0104] The magnetic scraping mechanism includes a magnetic powder receiving plate 3211, a magnetic powder scraping plate 3212 and a pre-tightening assembly. The magnetic powder receiving plate 3211 is rotatably installed on the machine body 321 through a rotating shaft 3213. The magnetic powder scraping plate 3212 is fixedly connected to the magnetic powder receiving plate 3211. The magnetic powder scraping plate 3212 is located between the magnetic powder receiving plate 3211 and the rotating drum 322. One end of the magnetic powder scraping plate 3212 close to the rotating drum 322 abuts against the cylindrical surface of the rotating drum 322. One end of the magnetic powder receiving plate 3211 away from the magnetic powder scraping plate 3212 is connected to the magnetic powder discharge groove 32102. The pre-tightening assembly includes a pre-tightening cylinder 3214. The pre-tightening cylinder 3214 is hingedly installed outside the machine body 321. One end of the rotating shaft 3213 is connected with a shaft sleeve 3215. The shaft sleeve 3215 has a connecting portion. The piston rod end of the pre-tightening cylinder 3214 is hingedly connected to the connecting portion of the shaft sleeve 3215. When the pre-tightening cylinder 3214 works, it ensures that the magnetic powder scraping plate 3212 always effectively abuts against the outer cylinder wall of the rotating drum 322, realizing the scraping of the magnetic powder. The scraped magnetic powder enters the magnetic powder discharge groove 32102 and is discharged through the magnetic powder outlet of the magnetic powder discharge groove 32102, and is transported to the magnetic seed mixing tank 20 through the magnetic powder conveying pipeline 26. In this way, the recovery and recycling of the magnetic powder are realized.

[0105] In this embodiment, the adjacent sides of the magnetic powder receiving plate 3211 and the magnetic powder scraping plate 3212 overlap and are fixedly connected by using installation bolts.

[0106] In this embodiment, both ends of the magnetic powder receiving plate 3211 are fixedly connected to the rotating shaft 3213 respectively. The shaft sleeve 3215 is sleeved on the rotating shaft 3213, and a locking bolt 3216 is threadedly installed on the shaft sleeve 3215. The locking bolt 3216 abuts against the rotating shaft 3213. A limiting baffle 3217 is fixedly installed at the end of the rotating shaft 3213 by using mounting bolts.

[0107] An impact water pipe 3218 is further provided in the machine body 321. The impact water pipe 3218 is located above the magnetic powder scraping plate 3212, and the impact water pipe 3218 is correspondingly arranged with the magnetic powder scraping end of the magnetic powder scraping plate 3212. A plurality of water outlet and magnetic impact holes are opened on one side of the impact water pipe 3218 facing the magnetic powder scraping end of the magnetic powder scraping plate 3212. The water outlet and magnetic impact holes are uniformly arranged along the length direction of the impact water pipe 3218. During operation, the impact water pipe 3218 flushes the magnetic powder scraping position, which is more convenient for scraping the magnetic powder from the roller and realizes the dilution of the magnetic powder, facilitating subsequent recycling and reuse.

[0108] The magnetic core includes a magnetic inner cylinder 3219 and magnets 3221. The magnetic inner cylinder 3219 is rotatably installed on the machine body 321, and a magnetic angle adjustment plate 3220 is fixedly installed at one end of the magnetic inner cylinder 3219. The magnetic angle adjustment plate 3220 is fixedly connected to the machine body 321 by using positioning bolts. A plurality of magnets 3221 are provided. The plurality of magnets 3221 are sequentially fixedly installed on the outer cylinder wall of the magnetic inner cylinder 3219, and the plurality of magnets 3221 form a magnetic region.

[0109] In this embodiment, an outer bearing seat is fixedly installed on the machine body 321. An outer bearing is installed on the outer bearing seat. The rotating cylinder 322 is rotatably installed on the machine body 321 by using the outer bearing. The core shaft of the magnetic inner cylinder 3219 is rotatably installed with the rotating cylinder 322 by using an inner bearing. The magnetic angle adjustment plate 3220 is fixedly installed on the outer bearing seat by using positioning bolts.

[0110] In one embodiment, a baffle 3222 is provided on the side of the lower arc plate 328 facing the rotating cylinder 322. The baffle 3222 is respectively arranged near both side edges of the lower arc plate 328, and the baffle 3222 is adapted to the arc of the lower arc plate 328. The side of the baffle 3222 close to the rotating cylinder 322 abuts against the outer cylinder wall of the rotating cylinder 322. The provided baffle 3222 forms a muddy water channel with the lower arc plate 328 and the outer wall of the rotating cylinder 322, avoiding the overflow of the magnetic muddy water in the muddy water channel and ensuring that the outer cylinder wall of the lower half of the rotating cylinder 322 is effectively immersed in the magnetic muddy water in the muddy water channel.

[0111] In one embodiment, a muddy water collecting cavity 3223 is provided below the mud discharging end of the lower arc plate 328 of the machine body 321. The bottom of the muddy water collecting cavity 3223 is of an inverted trapezoidal structure, which is convenient for the collection of sludge. The sludge outlet 32103 is communicated with the muddy water collecting cavity 3223. The sludge entering the muddy water collecting cavity 3223 is discharged from the sludge outlet 32103 and is transported to the sludge pool 58 through the second sludge discharging pipeline 33.

[0112] In one embodiment, a water discharge port is provided at the middle position of the bottom of the lower arc plate 328. A water discharge pipe 3224 is connected between the water discharge port and the sludge outlet 32103, and an emptying valve 3225 is provided on the water discharge pipe 3224. When the magnetic recovery machine 32 is not in use, the emptying valve 3225 is opened to empty the magnetic sludge water in the mud-water passage.

[0113] In this embodiment, a lifting plate 3226 is provided at the bottom of the machine body 321, and a handle 3227 is provided at the top of the machine body 321. The magnetic recovery machine 32 can be easily lifted and transported through the lifting plate 3226 and the handle 3227.

[0114] As Figures 1 to 4 Collectively shown, the advanced treatment unit includes an aerated biological filter 38 and a sulfur autotrophic denitrification filter 39. The aerated biological filter 38 is connected to the water outlet of the high-intensity magnetic separator 30, and a biological filter media layer 40 is provided in the aerated biological filter 38. The sulfur autotrophic denitrification filter 39 is connected to the aerated biological filter 38, and a denitrification packing layer 41 is provided in the sulfur autotrophic denitrification filter 39. An aeration device is also connected upstream of the aerated biological filter 38 and the sulfur autotrophic denitrification filter 39. The backwash outlets of the aerated biological filter 38 and the sulfur autotrophic denitrification filter 39 are connected to the sludge tank 58 through a backwash outlet water pipe 42.

[0115] In this embodiment, the biological filter media layer 40 is composed of spherical ceramsite filter media. Of course, other granular materials can also be selected. The denitrification packing layer 41 is filled with Auto-DN® special autotrophic denitrification packing.

[0116] In this embodiment, the water outlet of the third water supply pipe 37 is connected to the bottom of the aerated biological filter 38. When the third submersible pump 36 works, the wastewater in the second intermediate water tank 34 is transported into the aerated biological filter 38 through the third water supply pipe 37.

[0117] A third intermediate water tank 43 is provided between the aerated biological filter 38 and the sulfur autotrophic denitrification filter 39. The aerated biological filter 38 is connected to the third intermediate water tank 43 through a biological filter outlet water pipe 44. A fourth submersible pump 45 is provided in the third intermediate water tank 43. The fourth submersible pump 45 is connected to a fourth water supply pipe 46. The water outlet of the fourth water supply pipe 46 is connected to the bottom of the sulfur autotrophic denitrification filter 39. When the fourth submersible pump 45 works, the wastewater in the third intermediate water tank 43 is transported into the sulfur autotrophic denitrification filter 39 through the fourth water supply pipe 46.

[0118] The aeration device includes an aeration blower 47. A first aeration pipe network 48 and a second aeration pipe network 49 are respectively laid at the bottoms of the biological aerated filter 38 and the sulfur autotrophic denitrification filter 39. The aeration blower 47 is connected to the first aeration pipe network 48 and the second aeration pipe network 49 through an air supply pipeline 50, and conveys air to the bottoms of the biological aerated filter 38 and the sulfur autotrophic denitrification filter 39 respectively.

[0119] The wastewater enters the biological aerated filter 38. The aeration device conveys air to the bottom of the biological aerated filter 38, providing oxygen for the biological attached flora to carry out metabolic activities, and subdividing the air into tiny bubbles and evenly distributing them on the surface of the filter media in the biological filter media layer 40 to provide sufficient oxygen. When the sewage passes through the biological filter media layer 40, organisms will attach to the surface of the filter media and use organic matter as an energy source for metabolic activities. The microorganisms in the biological aerated filter 38 mainly include nitrifying bacteria and denitrifying bacteria, which respectively complete the oxidation and denitrification reactions of ammonia nitrogen. When the ammonia nitrogen in the sewage passes through the filter media layer, the nitrifying bacteria will use ammonia nitrogen as an energy source for oxidation reactions. First, ammonia nitrogen will be oxidized into nitrite, and then further oxidized into nitrate. This process is called nitrification, and the nitrate produced therein is called nitrified nitrogen. Nitrified nitrogen is a harmless product, but excessive nitrified nitrogen will have a negative impact on the water environment. Therefore, it is necessary to further convert nitrified nitrogen into nitrogen and release it into the atmosphere. This process is called the denitrification reaction. In the biological aerated filter 38, the denitrifying bacteria will use nitrate as an electron acceptor and reduce nitrified nitrogen to nitrogen.

[0120] The wastewater is treated by the biological aerated filter 38 and is conveyed from the third intermediate water tank 43 to the sulfur autotrophic denitrification filter 39. The autotrophic denitrifying bacteria in the sulfur autotrophic denitrification filter 39 use CO2, HCO3 - , CO3 2- etc. as carbon sources, and mainly use inorganic substances such as S, S 2- , H2, S2O3 2- , Fe, Fe 2+ , NH4 + etc. as electron donors for nitrate nitrogen reduction to complete microbial metabolism, reducing NO3 - -N in the nitrate nitrogen-polluted water body to N2 and releasing it into the atmosphere, ultimately achieving the removal of TN. The sulfur autotrophic denitrification filter 39 uses autotrophic denitrification filter media as the medium. The autotrophic denitrification filter media is both a high-efficiency carrier for microorganisms and a high-efficiency electron donor, and can also play a certain physical filtration role; as the reaction in the sulfur autotrophic denitrification filter 39 proceeds, the autotrophic denitrification filter media as an electron donor will be gradually consumed. Only by regularly replenishing the filter media can sufficient biomass and electron donor amount be ensured to maintain the efficient progress of autotrophic denitrification. Therefore, the denitrification packing layer 41 in the sulfur autotrophic denitrification filter 39 is of a liftable structure.

[0121] As shown Figures 1 to 4 collectively, the clear water tank 51 is connected to the sulfur autotrophic denitrification filter 39 through the denitrification filter outlet pipeline 52, and the water body treated by the sulfur autotrophic denitrification filter 39 flows into the clear water tank 51 through the denitrification filter outlet pipeline 52.

[0122] An anti-flushing pump 53 is provided in the clear water tank 51. The anti-flushing pump 53 is connected to an anti-flushing water supply pipeline 54. The anti-flushing pipeline is respectively connected to the biological aerated filter 38 and the sulfur autotrophic denitrification filter 39, and the outlets of the anti-flushing water supply pipeline 54 respectively extend below the biological filter material layer 40 and the denitrification packing layer 41; when the anti-flushing pump 53 works, the clear water body in the clear water tank 51 is respectively transported to below the biological filter material layer 40 and the denitrification packing layer 41 through the anti-flushing water supply pipeline 54 to perform anti-flushing on the biological aerated filter 38 and the sulfur autotrophic denitrification filter 39. The muddy water generated by the anti-flushing is discharged from the anti-flushing outlets of the biological aerated filter 38 and the sulfur autotrophic denitrification filter 39, and is transported to the sludge tank 58 through the anti-flushing outlet pipeline 42.

[0123] As shown Figures 1 to 4 collectively, the disinfection tank 55 is connected to the clear water tank 51. A disinfection device 56 is provided upstream of the disinfection tank 55. The disinfection device 56 is connected to the disinfection tank 55 by a disinfection pipeline 57. The water body flows from the clear water tank 51 into the disinfection tank 55. At the same time, the disinfection device 56 adds a disinfection agent into the disinfection tank 55 through the disinfection pipeline 57 to realize the disinfection of the water body. The water body after disinfection treatment can be discharged or reused.

[0124] In this embodiment, check valves are provided on the first water supply pipeline 7, the second water supply pipeline 18, the third water supply pipeline 37, and the fourth water supply pipeline 46.

[0125] This embodiment also provides a method for denitrifying and dephosphorizing mine wastewater by using the above-mentioned mine wastewater denitrifying and dephosphorizing treatment system, including the following steps:

[0126] S1. Transport the mine wastewater to the grid channel 1. After the wastewater passes through the grid channel 1 to remove larger sundries, it flows into the collection tank 2 by gravity;

[0127] S2. Transport the wastewater in the collection tank 2 to the first coagulation tank 3. At the same time, the first PAC dosing device 8 adds polyaluminum chloride coagulant into the first coagulation tank 3, and uses the first mechanical stirring device 11 to stir and mix the wastewater and the reagent;

[0128] S3. The wastewater in the first coagulation tank 3 flows into the first flocculation tank 4. At the same time, the first PAM dosing device 9 adds polyacrylamide flocculant into the first flocculation tank 4, and uses the second mechanical stirring device 13 to stir and mix the wastewater and the reagent;

[0129] S4. The wastewater in the first flocculation tank 4 flows into the horizontal flow sedimentation tank 5. After sedimentation in the horizontal flow sedimentation tank 5, the wastewater flows into the first intermediate water tank 16. The sludge that has settled to the bottom of the horizontal flow sedimentation tank 5 is pumped into the sludge tank 58 by the truss type scraping and sucking sludge machine 14;

[0130] S5. The wastewater in the first intermediate water tank 16 is transported to the second coagulation tank 19. Meanwhile, the second PAC dosing device 22 adds polyaluminum chloride coagulant into the second coagulation tank 19, and the third mechanical stirring device 25 stirs and mixes the wastewater and the reagent;

[0131] S6. The wastewater in the second coagulation tank 19 flows into the magnetic seed stirring tank 20. Meanwhile, magnetic powder is added into the magnetic seed stirring tank 20, and the fourth mechanical stirring device 27 stirs and mixes the wastewater and the magnetic powder;

[0132] S7. The wastewater in the magnetic seed stirring tank 20 flows into the second flocculation tank 21. Meanwhile, the second PAM dosing device 23 adds polyacrylamide flocculant into the second flocculation tank 21, and the fifth mechanical stirring device 29 stirs and mixes the wastewater and the reagent;

[0133] S8. The wastewater in the second flocculation tank 21 flows into the high gradient magnetic separator 30. After solid-liquid separation in the high gradient magnetic separator 30, the wastewater flows into the second intermediate water tank 34. The magnetic sludge containing magnetic seeds is transported to the magnetic recovery machine 32. In the magnetic recovery machine 32, the magnetic seeds and the sludge are dispersed and the magnetic seeds are recovered. The recovered magnetic powder is transported back into the magnetic seed stirring tank 20, and the non-magnetic sludge separated is discharged into the sludge tank 58;

[0134] S9. The wastewater in the second intermediate water tank 34 is transported to the biological aerated filter 38. Meanwhile, the aeration device conveys air into the biological aerated filter 38. The oxidation and denitrification reactions of ammonia nitrogen are completed in the biological aerated filter 38. The wastewater treated by the biological aerated filter 38 flows into the third intermediate water tank 43;

[0135] S10. The wastewater in the third intermediate water tank 43 is transported to the sulfur autotrophic denitrification filter 39. Meanwhile, the aeration device conveys air into the sulfur autotrophic denitrification filter 39. The removal of TN is completed in the sulfur autotrophic denitrification filter 39. The water body treated by the sulfur autotrophic denitrification filter 39 flows into the clear water tank 51;

[0136] S11. The water body in the clear water tank 51 flows into the disinfection tank 55. Meanwhile, the disinfection device 56 adds medicine for disinfection treatment into the disinfection tank 55. After killing the harmful bacteria in the water body, it is discharged;

[0137] S12. The supernatant liquid at the top of the sludge tank 58 is re-circulated to the collecting tank 2, and the sludge at the bottom of the sludge tank 58 is regularly cleaned and transported out.

[0138] Based on the above-mentioned mine wastewater denitrification and phosphorus removal treatment system and the denitrification and phosphorus removal treatment method, during operation, first, larger debris in the wastewater is removed through the grille channel 1, and then the wastewater enters the coagulation and sedimentation unit through the collection pool 2. The suspended substances and plankton in the wastewater are aggregated together to form flocs in the first coagulation tank 3 and the first flocculation tank 4, and the rapid sedimentation of the flocs in the wastewater is achieved in the horizontal flow sedimentation tank 5. The sludge deposited at the bottom of the horizontal flow sedimentation tank 5 is pumped into the sludge tank 58 by the overhead crane type scraping and sucking sludge machine 14; thereafter, the wastewater enters the magnetic coagulation and sedimentation unit, and the high-efficiency flocculation of various pollutants such as suspended solids, COD, organic matter, phosphorus, and heavy metals in the wastewater is achieved through the second coagulation tank 19, the magnetic seed mixing tank 20, and the second flocculation tank 21, forming a high-density floc with the magnetic seed as the core, and at the same time increasing the specific gravity of the floc to achieve the rapid sedimentation of the floc; after magnetic flocculation, the wastewater enters the magnetic separation and recovery unit, and the solid-liquid separation of the wastewater is achieved through the high-intensity magnetic separator 30, the sludge containing the magnetic seed is separated from the wastewater and sent to the magnetic recovery machine 32, the magnetic powder is recovered through the magnetic recovery machine 32 and re-sent to the magnetic seed mixing tank 20 for recycling, and the sludge from which the magnetic powder is separated is discharged into the sludge tank 58; the wastewater treated by the high-intensity magnetic separator 30 enters the advanced treatment unit, and the oxidation and denitrification reaction of ammonia nitrogen is completed through the biological aerated filter 38, the ammonia nitrogen in the wastewater is oxidized into nitrite and further oxidized into nitrate, and is converted into nitrogen gas and released into the atmosphere through the denitrification reaction. Thereafter, the NO3 - -N in the wastewater is reduced to N2 and released into the atmosphere, finally achieving the removal of TN; finally, the clear water body flows into the clear water tank 51, and after passing through the clear water tank 51, it flows into the disinfection tank 55, and is subjected to chemical disinfection treatment in the disinfection tank 55 and then recycled or discharged.

[0139] Through this mine wastewater denitrification and phosphorus removal treatment system, the effective purification treatment of mine wastewater can be realized, the removal effects of suspended solids, nitrogen, phosphorus, and heavy metals in the wastewater are good, the treatment efficiency of mine wastewater is high, the treatment effect is good, the treated wastewater meets the treatment and reuse requirements of mine wastewater, and it has good economic benefits and industrial application potential.

[0140] It should be understood that the uses of these embodiments are only for explaining the present invention and are not intended to limit the protection scope of the present invention. In addition, it should also be understood that after reading the technical content of the present invention, those skilled in the art can make various changes, modifications, and / or variations to the present invention, and all these equivalent forms also fall within the protection scope defined by the appended claims of this application.

Claims

1. A mine wastewater denitrification and phosphorus removal treatment system, characterized in that: include A grille channel, wherein the grille channels are provided with at least two; A water collection tank, the water collection tank is connected to the water outlet of the grille channel; A coagulation and sedimentation unit, wherein the coagulation and sedimentation unit comprises a first coagulation tank, a first flocculation tank and a horizontal flow sedimentation tank, wherein the first coagulation tank is connected to the water collection tank, the first coagulation tank, the first flocculation tank and the horizontal flow sedimentation tank are connected in sequence, and the first coagulation tank and the first flocculation tank are also connected to a first dosing device upstream, the horizontal flow sedimentation tank is provided with a gantry type scraper and suction machine, and the gantry type scraper and suction machine is connected to a sludge tank through a first sludge discharge pipeline; A magnetic coagulation sedimentation unit, the magnetic coagulation sedimentation unit comprising a second coagulation tank, a magnetic seed stirring tank and a second flocculation tank, the second coagulation tank is connected to the horizontal flow sedimentation tank, and the second coagulation tank, the magnetic seed stirring tank and the second flocculation tank are connected in sequence, the second coagulation tank and the second flocculation tank are also connected upstream with a second dosing device, and the magnetic seed stirring tank is connected with a magnetic powder conveying pipeline; A magnetic separation and recovery unit, the magnetic separation and recovery unit comprising a super magnetic separator and a magnetic recovery machine, the water inlet of the super magnetic separator is connected to the second flocculation tank, the magnetic recovery machine is connected to the sludge discharge port of the super magnetic separator, the sludge outlet of the magnetic recovery machine is connected to the sludge tank through the second sludge discharge pipeline, and the magnetic powder outlet of the magnetic recovery machine is connected to the magnetic powder conveying pipeline; The magnetic recovery machine comprises a machine body, a rotating drum driven by a driving device is rotatably installed in the machine body, a lower arc plate is provided below the rotating drum, the lower arc plate is fixedly installed on the machine body, and the lower arc plate is arranged close to the rotating drum and forms a mud and water channel between the rotating drum, a water equalizing mechanism, a magnetic scraping mechanism and a magnetic core are also provided in the machine body, and the water equalizing mechanism comprises a first uniform distribution plate and a second uniform distribution plate fixedly installed in the machine body; A deep processing unit, the deep processing unit comprises an aerated biological filter and a sulfur autotrophic denitrification filter, the aerated biological filter is connected to the water outlet of the supermagnetic separator, and a biological filter material layer is provided in the aerated biological filter, the sulfur autotrophic denitrification filter is connected to the aerated biological filter, and a denitrification filler layer is provided in the sulfur autotrophic denitrification filter, the aerated biological filter and the sulfur autotrophic denitrification filter are also connected to an aeration device upstream, and the backwash outlets of the aerated biological filter and the sulfur autotrophic denitrification filter are connected to the sludge tank through a backwash outlet pipeline; A clear water tank, the clear water tank is connected to the sulfur autotrophic denitrification filter, a backwash pump is arranged in the clear water tank, the backwash pump is connected to a backwash water supply pipeline, the backwash pipeline is respectively connected to the aerated biological filter and the sulfur autotrophic denitrification filter, and the water outlet of the backwash water supply pipeline extends to below the biological filter material layer and the denitrification filler layer respectively; as well as A disinfection pool is connected with the clean water pool. A disinfection device is provided upstream of the disinfection pool. The disinfection device is connected with the disinfection pool via a disinfection pipeline.

2. The mine wastewater denitrification and phosphorus removal treatment system according to claim 1, characterized in that: A first submersible sewage pump is provided in the water collection tank, the first submersible sewage pump is connected to a first water supply pipeline, and the water outlet of the first water supply pipeline is connected to the first coagulation tank; A first intermediate water tank is provided between the horizontal flow sedimentation tank and the second coagulation tank, the first intermediate water tank is located on one side of the horizontal flow sedimentation tank, and the first intermediate water tank is connected to the horizontal flow sedimentation tank, a second submersible sewage pump is provided in the first intermediate water tank, the second submersible sewage pump is connected to a second water supply pipeline, and the water outlet of the second water supply pipeline is connected to the second coagulation tank; The second flocculation tank is connected to the water inlet of the super magnetic separator through the magnetic flocculation outlet pipeline, a second intermediate water tank is provided between the super magnetic separator and the aerated biological filter, the water outlet of the super magnetic separator is connected to the second intermediate water tank through the magnetic separation outlet pipeline, a third submersible sewage pump is provided in the second intermediate water tank, the third submersible sewage pump is connected to the third water supply pipeline, and the water outlet of the third water supply pipeline is connected to the bottom of the aerated biological filter; A third intermediate water tank is provided between the aerated biological filter and the sulfur autotrophic denitrification filter, the aerated biological filter is connected to the third intermediate water tank through a biological filter outlet pipeline, a fourth submersible sewage pump is provided in the third intermediate water tank, the fourth submersible sewage pump is connected to a fourth water supply pipeline, a water outlet of the fourth water supply pipeline is connected to the bottom of the sulfur autotrophic denitrification filter, and the sulfur autotrophic denitrification filter is connected to the clean water tank through a denitrification filter outlet pipeline.

3. The mine wastewater denitrification and phosphorus removal treatment system according to claim 2 is characterized in that: The first dosing device includes a first PAC dosing device and a first PAM dosing device. The first PAC dosing device is connected to the first coagulation tank via a first PAC dosing pipeline, and a first mechanical stirring device is provided in the first coagulation tank. The first PAM dosing device is connected to the first flocculation tank via a first PAM dosing pipeline, and a second mechanical stirring device is provided in the first flocculation tank.

4. The mine wastewater denitrification and phosphorus removal treatment system according to claim 2, characterized in that: The second dosing device includes a second PAC dosing device and a second PAM dosing device. The second PAC dosing device is connected to the second coagulation tank by a second PAC dosing pipeline, and a third mechanical stirring device is provided in the second coagulation tank. The magnetic outlet of the magnetic powder conveying pipeline extends into the magnetic seed stirring tank, and a fourth mechanical stirring device is provided in the magnetic seed stirring tank. The second PAM dosing device is connected to the second flocculation tank by a second PAM dosing pipeline, and a fifth mechanical stirring device is provided in the second flocculation tank.

5. The mine wastewater denitrification and phosphorus removal treatment system according to claim 1, characterized in that: The aeration device comprises an aeration fan. A first aeration pipe network and a second aeration pipe network are laid at the bottom of the aerated biological filter and the sulfur autotrophic denitrification filter, respectively. The aeration fan is connected to the first aeration pipe network and the second aeration pipe network through an air supply pipeline.

6. The mine wastewater denitrification and phosphorus removal treatment system according to claim 1, characterized in that: A magnetic mud water inlet is provided at one end of the machine body, a magnetic powder discharge slot is provided at the other end of the machine body, and a sludge outlet is provided at the bottom of the machine body; One end of the mud-water channel is connected to the magnetic mud water inlet, and the other end of the mud-water channel is connected to the sludge outlet; The water equalizing mechanism is located between the rotating drum and the magnetic mud water inlet, the magnetic scraping mechanism is located between the rotating drum and the magnetic powder discharge groove, the magnetic core is fixedly mounted on the machine body and located in the rotating drum, the magnetic core is provided with a magnetic area and a non-magnetic area, the magnetic area extends from the other end of the mud and water channel along the rotation direction of the rotating drum to the top of the rotating drum, and the non-magnetic area corresponds to the magnetic scraping mechanism.

7. The mine wastewater denitrification and phosphorus removal treatment system according to claim 6, characterized in that: The first uniform distribution plate is fixedly mounted on the machine body and is arranged corresponding to the magnetic mud water inlet. A water uniform distribution channel is formed between the bottom end of the first uniform distribution plate and the lower arc plate. The second uniform distribution plate is located between the rotating drum and the first uniform distribution plate. A strip hole is opened on the machine body. The second uniform distribution plate is fixedly mounted on the machine body by means of positioning bolts passing through the strip hole, and the bottom of the second uniform distribution plate is inclined in a direction close to the rotating drum.

8. The mine wastewater denitrification and phosphorus removal treatment system according to claim 6, characterized in that: The magnetic scraping mechanism comprises a magnetic powder receiving plate, a magnetic powder scraping plate and a pre-tightening assembly, wherein the magnetic powder receiving plate is rotatably mounted on the machine body via a rotating shaft, the magnetic powder scraping plate is fixedly connected to the magnetic powder receiving plate, the magnetic powder scraping plate is located between the magnetic powder receiving plate and the rotating drum, one end of the magnetic powder scraping plate close to the rotating drum abuts against the drum surface of the rotating drum, and one end of the magnetic powder receiving plate away from the magnetic powder scraping plate is connected to the magnetic powder discharge groove; The pre-tightening assembly comprises a pre-tightening cylinder, which is hingedly mounted outside the body, one end of the rotating shaft is connected to a sleeve, the sleeve has a connecting portion, and the piston shaft end of the pre-tightening cylinder is hingedly connected to the connecting portion of the sleeve; A flushing pipe is also provided in the body, and the flushing pipe is located above the magnetic scraping plate, and the flushing pipe is arranged corresponding to the magnetic scraping end of the magnetic scraping plate. A plurality of water flushing holes are evenly opened on the side of the flushing pipe facing the magnetic scraping end of the magnetic scraping plate.

9. The mine wastewater denitrification and phosphorus removal treatment system according to claim 6, characterized in that: The magnetic core comprises a magnetic inner cylinder and a magnet, the magnetic inner cylinder is rotatably mounted on the machine body, and a magnetic angle adjustment plate is fixedly mounted on one end of the magnetic inner cylinder, the magnetic angle adjustment plate is fixedly connected to the machine body by a positioning bolt, and a plurality of magnets are provided, and the plurality of magnets are fixedly mounted on the outer cylinder wall of the magnetic inner cylinder in sequence, and the plurality of magnets form the magnetic region; And / or, a baffle is provided on the side of the lower arc plate facing the rotating drum, the baffles are respectively arranged close to the two side edges of the lower arc plate, and the baffle is adapted to the curvature of the lower arc plate, and the side of the baffle close to the rotating drum is in contact with the outer wall of the rotating drum; And / or, the machine body is provided with a mud and water collecting chamber below the mud outlet end of the lower arc plate, the bottom of the mud and water collecting chamber is an inverted trapezoidal structure, the sludge outlet is connected with the mud and water collecting chamber, a drain port is provided in the middle position of the bottom of the lower arc plate, a drain pipe is connected between the drain port and the sludge outlet, and an emptying valve is provided on the drain pipe.

10. A method for denitrification and dephosphorization of mine wastewater using the mine wastewater denitrification and dephosphorization treatment system according to any one of claims 2 to 4, characterized in that: The steps include: S1, transporting mine wastewater to the grid channel, and after the wastewater passes through the grid channel to remove larger debris, it flows into the water collection tank by gravity; S2, transporting the wastewater in the water collection tank to the first coagulation tank, and at the same time, adding polyaluminium chloride coagulant into the first coagulation tank by a first PAC dosing device, and stirring and mixing the wastewater and the agent by a first mechanical stirring device; S3, the wastewater in the first coagulation tank flows into the first flocculation tank, and at the same time, the first PAM dosing device adds polyacrylamide flocculant into the first flocculation tank, and the second mechanical stirring device is used to stir and mix the wastewater and the agent; S4, the wastewater in the first flocculation tank flows into the horizontal flow sedimentation tank, and after sedimentation in the horizontal flow sedimentation tank, the wastewater flows into the first intermediate water tank, and the sludge settled to the bottom of the horizontal flow sedimentation tank is pumped into the sludge tank by the gantry type scraper and suction machine; S5, transporting the wastewater in the first intermediate water tank to the second coagulation tank, and at the same time, adding polyaluminium chloride coagulant into the second coagulation tank by the second PAC dosing device, and stirring and mixing the wastewater and the agent by the third mechanical stirring device; S6, the wastewater in the second coagulation tank flows into the magnetic seed stirring tank, and at the same time, magnetic powder is added into the magnetic seed stirring tank, and the wastewater and the magnetic powder are stirred and mixed by a fourth mechanical stirring device; S7, the wastewater in the magnetic stirring tank flows into the second flocculation tank, and at the same time, the second PAM dosing device adds polyacrylamide flocculant into the second flocculation tank, and the fifth mechanical stirring device is used to stir and mix the wastewater and the agent; S8, the wastewater in the second flocculation tank flows into the super magnetic separator, and after solid-liquid separation is performed in the super magnetic separator, the wastewater flows into the second intermediate water tank, and the magnetic sludge containing magnetic seeds is transported to the magnetic recovery machine, and the magnetic seeds and sludge are dispersed and the magnetic seeds are recovered in the magnetic recovery machine, and the recovered magnetic powder is re-transported to the magnetic seed stirring tank, and the separated non-magnetic sludge is discharged to the sludge tank; S9, transporting the wastewater from the second intermediate water tank to the aerated biological filter, and at the same time, the aeration device transmits air into the aerated biological filter to complete the oxidation and denitrification reactions of ammonia nitrogen in the aerated biological filter, and the wastewater treated by the aerated biological filter flows into the third intermediate water tank; S10, transporting the wastewater from the third intermediate water tank to the sulfur autotrophic denitrification filter, and at the same time, the aeration device transmits air into the sulfur autotrophic denitrification filter to complete the removal of TN in the sulfur autotrophic denitrification filter, and the water treated by the sulfur autotrophic denitrification filter flows into the clear water tank; S11, the water in the clean water tank flows into the disinfection tank, and at the same time, the disinfection device adds medicine into the disinfection tank for disinfection treatment, kills harmful bacteria in the water and then discharges it; S12, the supernatant at the top of the sludge pool is returned to the water collection pool, and the sludge at the bottom of the sludge pool is regularly cleaned and transported out.

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