Anaerobic ammonia oxidation denitrification device and method for nitrogen-containing wastewater in rare earth mining area

Abstract

The invention relates to an anaerobic ammonia oxidation denitrification device and method for nitrogen-containing wastewater in a rare earth mining area, and relates to the technical field of anaerobic ammonia oxidation denitrification of nitrogen-containing wastewater. Comprising a pretreatment mechanism and a denitrification mechanism, heavy metal ions, SS and COD in wastewater are removed through the pretreatment mechanism, and a suitable production environment is provided for anaerobic ammonium oxidation bacteria through the denitrification mechanism; the method can solve the following problems in the anaerobic ammonia oxidation denitrification process of the nitrogen-containing wastewater in the prior art: a large amount of heavy metal ions contained in the wastewater inhibit the activity and denitrification efficiency of anaerobic ammonia oxidation bacteria, and excessive SS and COD are harmful to the environment and cause serious corrosion and blockage of wastewater treatment facilities; a large amount of maintenance cost needs to be consumed; the denitrification environment in the prior art is not suitable for survival of anaerobic ammonium oxidation bacteria, so that the anaerobic ammonium oxidation denitrification efficiency is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of anaerobic ammonia oxidation denitrification of nitrogen-containing wastewater, and in particular to an anaerobic ammonia oxidation denitrification device and method for nitrogen-containing wastewater in rare earth mining areas. Background Art

[0002] Rare earth mining areas refer to areas with mineral deposits rich in rare earth elements. These areas usually obtain rare earth resources through geological exploration and mining activities. The wastewater generated during the mining process in rare earth mining areas contains a large amount of ammonia nitrogen and other heavy metal ions, which causes the water body to seriously exceed the standard. Pollutants such as ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in these wastewaters will cause serious eutrophication pollution to the water body. The treatment of nitrogen-containing wastewater in rare earth mining areas is a complex and important topic, which involves anaerobic ammonia oxidation denitrification technology. Anaerobic ammonia oxidation denitrification is an efficient and energy-saving wastewater treatment technology. It mainly uses anaerobic ammonia-oxidizing bacteria to convert ammonia nitrogen into nitrogen gas under anaerobic conditions, thereby achieving nitrogen removal in sewage. It has the advantages of no need for external organic carbon sources, low sludge production and low energy consumption.

[0003] For example, a Chinese patent with publication number CN114790038A discloses an integrated device and method for anaerobic ammonia oxidation denitrification treatment of ammonia-containing wastewater, including a nitrification unit, wherein the nitrogen-containing wastewater is introduced into the nitrification unit for nitrification reaction; a sedimentation separation unit, wherein the nitrification unit is provided with a water distribution hole, and the nitrification unit is connected with the sedimentation separation unit through the water distribution hole, and the mixed liquid after the reaction in the nitrification unit enters the sedimentation separation unit through the water distribution hole for mud-water separation; an anaerobic ammonia oxidation denitrification unit, wherein the anaerobic ammonia oxidation denitrification unit is located at the upper part of the sedimentation separation unit, and the supernatant separated in the sedimentation separation unit enters the anaerobic ammonia oxidation denitrification unit for anaerobic ammonia oxidation denitrification reaction, and an outlet is provided above the anaerobic ammonia oxidation denitrification unit, and the supernatant after the reaction in the anaerobic ammonia oxidation denitrification unit is discharged from the outlet. Through the above structure, there is no need to limit the ratio of ammonia nitrogen to nitrite nitrogen in the effluent of the nitrification unit, thereby achieving effective removal of ammonia nitrogen and total nitrogen, and solving the problem of low denitrification efficiency of the anaerobic ammonia oxidation process in the prior art.

[0004] However, the above-mentioned integrated device and method for anaerobic ammonia oxidation denitrification treatment of ammonia-containing wastewater still has some shortcomings in actual use:

[0005] 1. First, the above-mentioned prior art improves the efficiency of anaerobic ammonium oxidation denitrification by integrating the three treatment functions of nitrification reaction, precipitation separation, and anaerobic ammonium oxidation denitrification. However, ammonia-containing wastewater often contains excessive heavy metal ions, SS (suspended solids) and COD (chemical oxygen demand). Heavy metal ions will inhibit the activity and denitrification efficiency of anaerobic ammonium oxidizing bacteria, resulting in reduced efficiency of anaerobic ammonium oxidation denitrification. At the same time, excessive SS and COD are not only harmful to the environment, but also cause serious corrosion and blockage problems in wastewater treatment facilities, which requires a lot of maintenance costs.

[0006] 2. Secondly, the anaerobic ammonium oxidation denitrification unit in the above technology only provides space for anaerobic ammonium oxidizing bacteria to carry out denitrification reaction, and does not provide an environment suitable for anaerobic ammonium oxidizing bacteria to carry out denitrification reaction. However, anaerobic ammonium oxidizing bacteria have very strict requirements on the environment during the denitrification process, and the optimal growth temperature is only 30-35°C. The water temperature of the reaction under normal temperature is far below this range, so it will lead to a reduction in the efficiency of anaerobic ammonium oxidation denitrification.

[0007] Therefore, based on the above-stated viewpoints, there is still room for improvement in the existing anaerobic ammonia oxidation denitrification devices and methods for nitrogen-containing wastewater. Summary of the invention

[0008] In order to solve the above problems, the present invention provides an anaerobic ammonia oxidation denitrification device and method for nitrogen-containing wastewater in rare earth mining areas.

[0009] In a first aspect, an anaerobic ammonia oxidation denitrification device for nitrogen-containing wastewater in a rare earth mining area comprises a pretreatment mechanism and a denitrification mechanism, wherein the pretreatment mechanism and the denitrification mechanism are both arranged on the ground;

[0010] The pretreatment mechanism includes a cleaning tank, a cylindrical load-bearing rod, an aeration unit and a carbon adsorption unit. The cleaning tank is arranged on the ground and has an upper and lower layer structure. The cylindrical load-bearing rod is vertically arranged inside the cleaning tank. The aeration unit is arranged at the bottom of the upper layer of the cleaning tank. The carbon adsorption unit is sleeved on the cylindrical load-bearing rod.

[0011] The denitrification mechanism includes a denitrification tank, an insulating outer tank, a heating pipe, an outer cavity area and a heat-conducting column. The denitrification tank is arranged on the ground, the insulating outer tank is sleeved on the denitrification tank, the heating pipe is arranged on the inner wall of the insulating outer tank, an outer cavity area is arranged between the outer wall of the denitrification tank and the inner wall of the insulating outer tank, and a plurality of the heat-conducting columns are horizontally arranged inside the denitrification tank at equal distances along the vertical direction.

[0012] Preferably, the aeration unit includes an aeration pipe, an air guide column, an aeration disc and a rotating disc. The aeration pipe is arranged at the bottom of the upper layer of the impurity removal tank, and the input end of the aeration pipe is penetrated through the side wall of the impurity removal tank, a number of the air guide columns are vertically penetrated through the top of the aeration pipe, a number of the aeration discs are sleeved on the top of the air guide columns, and the rotating disc at the same horizontal position as the aeration disc is sleeved on a cylindrical load-bearing rod, and the rotating disc is tangent to the aeration disc.

[0013] Preferably, a dust skimming assembly is also provided on the cylindrical load-bearing rod, and the dust skimming assembly includes an internal threaded cap, a dust skimming scoop, a No. 1 positioning column, a rotating door and a torsion spring. The internal threaded cap is threadedly connected to the top of the cylindrical load-bearing rod, a number of the dust skimming scoops are equidistantly arranged on the outer wall of the internal threaded cap, a number of the No. 1 positioning columns are horizontally arranged on the outer wall of the internal threaded cap, and each dust skimming scoop has two No. 1 positioning columns distributed up and down at the spoon mouth, the rotating door is arranged on the outer wall of the cylindrical load-bearing rod through a bearing, the torsion spring is sleeved on the bearing of the rotating door, and is located between the cylindrical load-bearing rod and the rotating door, one end of the torsion spring is passed through the internal threaded cap, and the other end abuts against the rotating door, so that the rotating doors distributed up and down are distributed back to back in the vertical direction.

[0014] Preferably, the carbon adsorption unit includes an I-shaped support frame, a No. 2 positioning column, an activated carbon plate and an internal threaded cover. The I-shaped support frame is sleeved on a cylindrical load-bearing rod and is located between a rotating disc and an internal threaded cap. The No. 2 positioning column is horizontally passed through the cylindrical load-bearing rod and is located at the bottom of the I-shaped support frame. The activated carbon plate is symmetrically arranged on the I-shaped support frame. The internal threaded cover is threadedly connected to the cylindrical load-bearing rod and is located at the top of the I-shaped support frame.

[0015] Preferably, a cleaning assembly is also provided on the I-shaped support frame, and the cleaning assembly includes a special-shaped support frame, a curved scraper and a guide plate. The special-shaped support frame is symmetrically arranged on both sides of the I-shaped support frame, the curved scraper is arranged at one end of the special-shaped support frame away from the I-shaped support frame, and the curved scraper is in contact with the inner wall of the impurity removal tank, and one end of the guide plate is arranged at the top of the curved scraper, and the other end is arranged on the side of the dust skimmer close to the curved scraper.

[0016] Preferably, the denitrification tank is also provided with a No. 1 infusion pipe and a No. 1 water pump, one end of the No. 1 infusion pipe is penetrated through the outer wall of the denitrification tank and is connected with the upper layer of the denitrification tank, the other end of the No. 1 infusion pipe is provided with a nitrification tank and penetrated through the outer wall of the nitrification tank, and the No. 1 water pump is arranged on the No. 1 infusion pipe; the denitrification tank is also provided with a No. 2 infusion pipe and a No. 2 water pump, one end of the No. 2 infusion pipe is penetrated through the outer wall of the nitrification tank, and the other end is penetrated through the outer wall of the denitrification tank, and the No. 2 water pump is arranged on the No. 2 infusion pipe.

[0017] Preferably, the denitrification tank is also provided with a circular step, a circular mesh screen and a handle, the circular step is arranged on the inner wall of the denitrification tank, the circular mesh screen is arranged on the top of the circular step, and the circular step is located between the circular mesh screen and the No. 2 infusion tube port, and the two symmetrically distributed handles are arranged on the top of the circular mesh screen.

[0018] Preferably, the denitrification tank is further provided with a U-shaped cover plate and a water outlet, wherein the U-shaped cover plate is arranged on the top of the denitrification tank, and the water outlet is penetrated through the outer wall of the denitrification tank and is located between the circular mesh screen and the U-shaped cover plate.

[0019] Preferably, a DC motor is also provided on the impurity removal tank, and the DC motor is arranged at the bottom of the lower layer of the impurity removal tank, and its output end is vertically upward and connected to the bottom of the cylindrical load-bearing rod.

[0020] In the second aspect, the present invention also proposes a method for anaerobic ammonia oxidation denitrification of nitrogen-containing wastewater in rare earth mining areas, and the method for anaerobic ammonia oxidation denitrification of nitrogen-containing wastewater in rare earth mining areas is as follows:

[0021] S1 Wastewater pretreatment: Pour the wastewater into the impurity removal tank, add chelating agent and flocculant, the pretreatment mechanism treats the wastewater, the aeration unit releases ozone-containing gas into the wastewater, and the carbon adsorption unit rotates in the wastewater to remove impurities;

[0022] S2 nitrification treatment: After the wastewater pretreatment, nitrification reaction is carried out;

[0023] S3 Denitrification Treatment: After the nitrification reaction of the wastewater is completed, the wastewater flows into the denitrification tank, and the heating tube is energized. The heating tube heats the liquid in the outer cavity area to the set temperature. The liquid passes through the inner wall of the denitrification tank and the heat-conducting column to heat the wastewater to the set temperature, so that the anaerobic ammonia-oxidizing bacteria can denitrify in a suitable temperature environment until the denitrification is completed.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The present invention releases a large amount of ozone-containing gas into the water through an aeration unit. Ozone efficiently degrades organic pollutants in the wastewater, removes suspended solids, and significantly reduces SOD. At the same time, bubbles carry suspended solids to the surface of the wastewater, effectively removing suspended solids inside the wastewater.

[0026] 2. The present invention also effectively adsorbs organic pollutants, heavy metal ions and suspended solids in wastewater through the carbon adsorption unit. At the same time, under the stirring action of the activated carbon plate, the effect of the chelating agent and flocculant on the wastewater is enhanced, and the heavy metal ions, organic pollutants and suspended solids in the wastewater are effectively removed, thereby making the reaction environment of anaerobic ammonia-oxidizing bacteria more suitable, thereby improving the denitrification efficiency of anaerobic ammonia-oxidizing bacteria.

[0027] 3. The present invention also collects suspended solids floating on the surface of wastewater through a dust skimming component, replacing manual skimming of suspended solids, thereby reducing labor costs.

[0028] Fourth, the present invention provides a suitable temperature environment for anaerobic ammonia oxidizing bacteria through the denitrification mechanism, and reduces the heat loss of wastewater through the heat-insulating outer tank, thereby improving the denitrification efficiency of anaerobic ammonia oxidizing bacteria.

[0029] 5. The present invention cleans the inner wall of the impurity removal tank through a cleaning component, automatically cleans the arc scraper through the impact of water flow, and automatically collects impurities with a dust skimmer, thereby achieving high efficiency and practicality in cleaning the inner wall of the impurity removal tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0031] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0032] Figure 2 It is a structural schematic diagram of the pretreatment mechanism, aeration unit and carbon adsorption unit of the present invention.

[0033] Figure 3 It is a structural schematic diagram of the aeration unit of the present invention.

[0034] Figure 4 It is a structural schematic diagram of the dust skimming assembly of the present invention.

[0035] Figure 5 The present invention Figure 4 Enlarged view of point A in the middle.

[0036] Figure 6 It is a structural schematic diagram of the carbon adsorption unit and the cleaning component of the present invention.

[0037] Figure 7 It is a structural schematic diagram of the denitrification mechanism of the present invention.

[0038] Figure 8 The present invention is a process flow chart of an anaerobic ammonia oxidation denitrification method for nitrogen-containing wastewater in rare earth mining areas.

[0039] In the figure, 1, pretreatment mechanism; 10, impurity removal tank; 11, cylindrical load-bearing rod; 12, aeration unit; 120, aeration pipeline; 121, air guide column; 122, aeration disc; 123, rotating disc; 13, carbon adsorption unit; 130, I-shaped support frame; 131, No. 2 positioning column; 132, activated carbon plate; 133, internal thread cover; 14, No. 1 infusion tube; 140, No. 1 water pump; 15, No. 2 infusion tube; 150, No. 2 water pump; 16, DC motor; 2, degassing Nitrogen mechanism; 20. Denitrification tank; 200. Circular step; 201. Circular mesh screen; 202. Handle; 203. U-shaped cover; 204. Water outlet; 21. Insulated outer tank; 22. Heating duct; 23. External cavity area; 24. Heat transfer column; 3. Dust skimming assembly; 30. Internal threaded cap; 31. Dust skimming spoon; 32. Positioning column No. 1; 33. Rotating door; 34. Torsion spring; 4. Cleaning assembly; 40. Special-shaped support frame; 41. Arc scraper; 42. Guide plate; 5. Nitrification tank. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-Figure 7 While embodiments of the invention have been described in detail, the invention can be implemented in many different ways as defined and covered by the claims.

[0041] The embodiment of the present application discloses an anaerobic ammonia oxidation denitrification device and method for nitrogen-containing wastewater in rare earth mining areas. It is explained that the anaerobic ammonia oxidation denitrification device for nitrogen-containing wastewater in rare earth mining areas is mainly used in the process of anaerobic ammonia oxidation denitrification of nitrogen-containing wastewater in rare earth mining areas. In terms of technical effect, it can effectively avoid the problem that heavy metal ions inhibit the activity and denitrification efficiency of anaerobic ammonia oxidation bacteria, resulting in reduced anaerobic ammonia oxidation denitrification efficiency, and excessive SS and COD cause serious corrosion and blockage of wastewater treatment facilities. Furthermore, the present invention can also avoid the problem that the existing denitrification environment causes low activity and denitrification efficiency of anaerobic ammonia oxidation bacteria.

[0042] Embodiment 1:

[0043] Reference Figure 1 and Figure 2 As shown, an anaerobic ammonia oxidation denitrification device for nitrogen-containing wastewater in rare earth mining areas includes a pretreatment mechanism 1, which is arranged on the ground.

[0044] The pretreatment mechanism 1 includes a de-impurity tank 10, a cylindrical load-bearing rod 11, an aeration unit 12 and a carbon adsorption unit 13. The de-impurity tank 10 is arranged on the ground, and the de-impurity tank 10 is a two-layer structure, the upper layer is used for pre-treating wastewater, and the lower layer is used for placing a DC motor 16. The upper end of the de-impurity tank 10 is an open structure for the delivery of wastewater, chelating agent and flocculant. The cylindrical load-bearing rod 11 is vertically arranged inside the de-impurity tank 10, and the upper end of the cylindrical load-bearing rod 11 is a threaded structure. The aeration unit 12 is arranged at the bottom of the upper layer of the de-impurity tank 10, and the carbon adsorption unit 13 is sleeved on the cylindrical load-bearing rod 11.

[0045] A DC motor 16 is also provided on the impurity removal tank 10 . The DC motor 16 is arranged at the bottom of the lower layer of the impurity removal tank 10 , and its output end is vertically upward and connected to the bottom of the cylindrical load-bearing rod 11 , serving as a power source for the rotation of the cylindrical load-bearing rod 11 .

[0046] First, pour the wastewater into the impurity removal tank 10 so that the wastewater level is at the same height as the dust skimmer 31, add a chelating agent and a flocculant, the chelating agent converts the heavy metal ions in the wastewater into water-insoluble compounds, and the flocculant is used to remove organic pollutants in the wastewater, and start the DC motor 16 to drive the cylindrical load-bearing rod 11 to rotate.

[0047] Reference Figure 3 As shown in the figure, it is an aeration unit 12 for releasing gas into wastewater to generate bubbles in the present invention. Specifically, the aeration unit 12 includes an aeration pipe 120, a gas guide column 121, an aeration disc 122 and a rotating disc 123. The aeration pipe 120 is arranged at the bottom of the upper layer of the impurity removal tank 10, and the input end of the aeration pipe 120 is penetrated through the side wall of the impurity removal tank 10. The aeration pipe 120 is used to pass the gas containing ozone. A plurality of gas guide columns 121 are vertically penetrated through the top of the aeration pipe 120 to transport the gas to the aeration disc 122. A plurality of aeration discs 122 are sleeved on the gas guide column 121. At the top of the air column 121, a rotating disc 123 at the same horizontal position as the aeration disc 122 is sleeved on the cylindrical load-bearing rod 11, and the rotating disc 123 is tangent to the aeration disc 122. When the rotating disc 123 rotates driven by the cylindrical load-bearing rod 11, the aeration disc 122 is driven to rotate through friction, so that the gas released by the aeration disc 122 is larger in range and has a faster moving speed, thereby increasing the speed at which bubbles drive suspended solids to move to the surface of the wastewater, and at the same time improving the efficiency of ozone in degrading organic pollutants in the wastewater and removing suspended solids.

[0048] During the specific implementation process, when the DC motor 16 is started to drive the cylindrical load-bearing rod 11 to rotate, the cylindrical load-bearing rod 11 will drive the rotating disc 123 to rotate synchronously, and then the rotating disc 123 drives the aeration disc 122 to rotate, and the ozone-containing gas is introduced into the aeration pipe 120. The gas enters the aeration disc 122 through the air guide column 121. While the aeration disc 122 rotates, the ozone-containing gas enters the wastewater in large quantities and quickly, generating a large number of bubbles. The bubbles drive the suspended solids to move to the surface of the wastewater. At the same time, ozone efficiently degrades organic pollutants in the wastewater, removes suspended solids, and significantly reduces COD in the wastewater.

[0049] Reference Figure 4 as well as Figure 5 As shown, the dust skimming assembly 3 for skimming suspended solids on the surface of wastewater in the present invention is shown. Specifically, the dust skimming assembly 3 includes an internal threaded cap 30, a dust skimming scoop 31, a No. 1 positioning column 32, a rotating door 33 and a torsion spring 34. The internal threaded cap 30 is threadedly connected to the top of the cylindrical load-bearing rod 11. This structure has the function of convenient installation and disassembly. A plurality of dust skimming scoops 31 are equidistantly arranged on the outer wall of the internal threaded cap 30. The dust skimming scoops 31 are used to skim suspended solids on the surface of wastewater, so that the suspended solids are gathered on the dust skimming scoops 31. Inside, a number of No. 1 positioning columns 32 are horizontally arranged on the outer wall of the internal threaded cap 30, and each dust skimmer 31 has two No. 1 positioning columns 32 distributed up and down at the spoon mouth, and a rotating door 33 is arranged on the outer wall of the internal threaded cap 30 through a rotating shaft. A torsion spring 34 is sleeved on the rotating shaft of the rotating door 33 and is located between the internal threaded cap 30 and the rotating door 33. One end of the torsion spring 34 is passed through the internal threaded cap 30 and the other end abuts against the rotating door 33, so that the rotating doors 33 distributed up and down are distributed opposite to each other in the vertical direction.

[0050] It should be noted that in the initial state, under the torsion of the torsion spring 34, the revolving doors 33 on the No. 1 positioning column 32 distributed up and down are distributed opposite to each other in the vertical direction. When the cylindrical load-bearing rod 11 drives the dust skimmer 31 to rotate through the internal threaded cap 30, the dust skimmer 31 rotates in the wastewater, so that the dust skimmer 31 and the wastewater generate an interactive force. The revolving door 33 begins to squeeze the torsion spring 34 under the thrust of the wastewater until the revolving door 33 is in a horizontal state. At this time, the thrust of the wastewater on the revolving door 33 is minimal, so that the suspended solids on the surface of the wastewater can enter. Inside the dust skimmer 31; when the wastewater pretreatment is completed, the cylindrical load-bearing rod 11 stops rotating, and the dust skimmer 31 stops rotating accordingly. At this time, the wastewater does not generate thrust on the rotating door 33, so that the rotating door 33 returns to a vertical state under the action of the torsion spring 34, thereby preventing the suspended solids from flowing out of the dust skimmer 31 due to buoyancy, thereby improving the dust skimmer 31's effect of collecting and storing suspended solids. Then, the internal threaded cap 30 is manually unloaded, the dust skimmer 31 is taken out, and the dust skimmer 31 is cleaned. After cleaning, it is reinstalled on the top of the cylindrical load-bearing rod 11.

[0051] During the specific implementation process, the bubbles drive the suspended solids to move toward the surface of the wastewater until the suspended solids float on the surface of the wastewater. The rotating dust skimmer 31 makes the rotating door 33 horizontal under the thrust of the wastewater, so that the suspended solids floating on the surface of the wastewater enter the dust skimmer 31 and are collected by the dust skimmer 31.

[0052] Reference Figure 6 As shown in the figure, the carbon adsorption unit 13 for adsorbing organic pollutants, heavy metal ions and suspended solids in wastewater in the present invention is shown. Specifically, the carbon adsorption unit 13 includes an I-shaped support frame 130, a second positioning column 131, an activated carbon plate 132 and an internal threaded cap 133. The I-shaped support frame 130 is sleeved on the cylindrical load-bearing rod 11 and is located between the rotating disc 123 and the internal threaded cap 30. The I-shaped support frame 130 is used to clamp the activated carbon plate 132. The second positioning column 131 is horizontally penetrated in the cylindrical load-bearing rod 11. The cylindrical load-bearing rod 11 is located at the bottom of the I-shaped support frame 130. The No. 2 positioning column 131 is used to limit and fix the I-shaped support frame 130. The activated carbon plate 132 is symmetrically arranged on the I-shaped support frame 130. The activated carbon plate 132 is used to adsorb organic pollutants, heavy metal ions and suspended solids in the wastewater. The internal threaded cover 133 is threadedly connected to the cylindrical load-bearing rod 11 and is located at the top of the I-shaped support frame 130. The internal threaded cover 133 is used to limit and fix the I-shaped support frame 130.

[0053] It should be noted that the carbon adsorption unit 13 has the function of convenient disassembly and installation. During installation, it is only necessary to put the I-shaped support frame 130 on the cylindrical load-bearing rod 11, with the bottom abutting against and cooperating with the No. 2 positioning column 131, and tighten the internal thread cover 133 on the top of the I-shaped support frame 130; when disassembling, loosen the internal thread cover 133 and remove it, and take the I-shaped support frame 130 out of the cylindrical load-bearing rod 11.

[0054] During the specific implementation process, when the cylindrical load-bearing rod 11 rotates, the cylindrical load-bearing rod 11 drives the activated carbon plate 132 to rotate through the I-shaped support frame 130, so that the activated carbon plate 132 adsorbs organic pollutants, heavy metal ions and suspended solids in the wastewater. At the same time, under the stirring action of the activated carbon plate 132, the wastewater fully reacts with the chelating agent and the flocculant, thereby improving the efficiency of the chelating agent in removing heavy metal ions and the flocculant in removing organic pollutants in the wastewater. At the same time, it also improves the efficiency of ozone in degrading organic pollutants in the wastewater and removing suspended solids, thereby significantly reducing the COD in the wastewater.

[0055] Replay Figure 6, is a cleaning component 4 for cleaning the inner wall of the impurity removal tank 10 in the present invention. Specifically, the cleaning component 4 includes a special-shaped support frame 40, a curved scraper 41 and a guide plate 42. The special-shaped support frame 40 is symmetrically arranged on both sides of the I-shaped support frame 130, and is used to support and fix the curved scraper 41. The curved scraper 41 is arranged at one end of the special-shaped support frame 40 away from the I-shaped support frame 130, and the curved scraper 41 is in contact with the inner wall of the impurity removal tank 10, and is used to scrape impurities on the inner wall of the impurity removal tank 10. One end of the guide plate 42 is arranged at the top of the curved scraper 41, and the other end is arranged at a side of the dust skimmer 31 close to the curved scraper 41.

[0056] During the specific implementation process, when the I-shaped support frame 130 drives the special-shaped support frame 40 to rotate, the special-shaped support frame 40 drives the arc scraper 41 to rotate synchronously. The arc scraper 41 cleans the inner wall of the impurity removal tank 10 when rotating in the wastewater. At the same time, the arc scraper 41 interacts with the wastewater output. Because the arc scraper 41 is an arc structure, the water flows upward along the arc scraper 41 to wash, thereby driving the impurities to move upward. Finally, under the action of the guide plate 42, the impurities enter the dust skimmer 31 with the water flow, and are collected by the dust skimmer 31. While cleaning the inner wall of the impurity removal tank 10, the arc scraper 41 can also be automatically cleaned.

[0057] Replay Figure 1 Specifically, the impurity removal tank 10 is also provided with a No. 1 infusion pipe 14 and a No. 1 water pump 140, which are used to transport wastewater from the impurity removal tank 10 to the nitrification tank 5. One end of the No. 1 infusion pipe 14 is penetrated through the outer wall of the impurity removal tank 10 and is connected with the upper layer of the impurity removal tank 10, and the other end of the No. 1 infusion pipe 14 is provided with the nitrification tank 5 and penetrated through the outer wall of the nitrification tank 5. The No. 1 water pump 140 is arranged on the No. 1 infusion pipe 14; the denitrification tank 20 is also provided with a No. 2 infusion pipe 15 and a No. 2 water pump 150, one end of the No. 2 infusion pipe 15 is penetrated through the outer wall of the nitrification tank 5, and the other end is penetrated through the outer wall of the denitrification tank 20, and the No. 2 water pump 150 is arranged on the No. 2 infusion pipe 15.

[0058] During the specific implementation process, after the pretreatment of the wastewater in the impurity removal tank 10 is completed, the No. 1 water pump 140 is started to make the wastewater flow into the nitrification tank 5, and the nitrification tank 5 performs nitrification treatment on the wastewater. After the nitrification treatment is completed, the No. 2 water pump 150 is started to make the wastewater flow into the denitrification tank 20, and then the anaerobic ammonia oxidizing bacteria denitrify the wastewater.

[0059] Embodiment 2:

[0060] Reference Figure 7As shown, on the basis of the first embodiment, in order to further improve the denitrification efficiency of anaerobic ammonia-oxidizing bacteria for wastewater, the present invention further proposes a denitrification mechanism 2. Specifically, the denitrification mechanism 2 includes a denitrification tank 20, an insulating outer tank 21, a heating conduit 22, an outer cavity area 23 and a heat-conducting column 24. The denitrification tank 20 is arranged on the ground. The area of ​​the denitrification tank 20 wrapped by the insulating outer tank 21 is a heat-conducting material for conducting heat to the wastewater inside. The insulating outer tank 21 is sleeved on the denitrification tank 20. The thermal outer tank 21 is made of insulating material to reduce heat loss. The heating pipe 22 is arranged on the inner wall of the thermal insulation outer tank 21. An outer cavity area 23 is provided between the outer wall of the denitrification tank 20 and the inner wall of the thermal insulation outer tank 21 to store liquid with a large specific heat capacity. Liquid with a large specific heat capacity can absorb and release a large amount of heat, which is convenient for heat transfer. A number of heat-conducting columns 24 are arranged horizontally and equidistantly in the vertical direction inside the denitrification tank 20 to enhance the heat conduction effect so that the water temperature in different areas of the wastewater is consistent.

[0061] During the specific implementation process, after the wastewater enters the denitrification tank 20, the heating conduit 22 is energized and heats the liquid with a larger specific heat capacity. The heat is transferred to the wastewater through the side wall of the denitrification tank 20 and the heat-conducting column 24, thereby uniformly heating the wastewater. When the wastewater reaches a temperature of 30-35°C, the heating conduit 22 stops energizing. When the wastewater temperature drops below 30°C, the heating conduit 22 continues to energize until the wastewater reaches a temperature of 30-35°C, thereby maintaining the optimal reaction environment for anaerobic ammonia-oxidizing bacteria.

[0062] Replay Figure 7 Specifically, the denitrification tank 20 is also provided with a circular step 200, a circular mesh screen 201 and a handle 202. The circular step 200 is arranged on the inner wall of the denitrification tank 20, and the circular step 200 is used to support the circular mesh screen 201. The circular mesh screen 201 is arranged on the top of the circular step 200, and the circular step 200 is located between the circular mesh screen 201 and the port of the No. 2 infusion tube 15. The circular mesh screen 201 is used to filter the sludge in the wastewater. Two symmetrically distributed handles 202 are arranged on the top of the circular mesh screen 201, and the handles 202 are used to place and take out the circular mesh screen 201.

[0063] Replay Figure 7 Specifically, the denitrification tank 20 is also provided with a U-shaped cover 203 and a water outlet 204. The U-shaped cover 203 is arranged on the top of the denitrification tank 20 for opening and closing the denitrification tank 20 and forming a closed interval with the denitrification tank 20. The water outlet 204 is penetrated through the outer wall of the denitrification tank 20 and is located between the circular mesh 201 and the U-shaped cover 203.

[0064] During the specific implementation process, when the anaerobic ammonia-oxidizing bacteria have completed denitrification, the No. 2 water pump 150 is started to allow the wastewater to flow into the denitrification tank 20, and the water outlet 204 is opened at the same time. Under the squeezing effect of the newly-flowing wastewater, the wastewater after denitrification moves toward the circular mesh 201, and the circular mesh 201 filters the sludge in the wastewater. The wastewater moves to the water outlet 204 and flows out from the water outlet 204 to obtain clean water after denitrification.

[0065] Reference Figure 8 A method for anaerobic ammonia oxidation denitrification of nitrogen-containing wastewater in rare earth mining areas is shown below:

[0066] S1. Wastewater pretreatment: First, pour the wastewater into the impurity removal tank 10, so that the wastewater water level is at the same height as the dust skimmer 31, add a chelating agent and a flocculant, start the DC motor 16 to drive the cylindrical load-bearing rod 11 to rotate, and the cylindrical load-bearing rod 11 drives the aeration disc 122 to rotate through the rotating disc 123, and introduces ozone-containing gas into the aeration pipe 120. The gas enters the aeration disc 122 through the air guide column 121. While the aeration disc 122 rotates, the ozone-containing gas enters the wastewater in large quantities and quickly, generating a large number of bubbles. Ozone efficiently degrades organic pollutants in the wastewater, removes suspended solids, and significantly reduces the COD in the wastewater; at the same time, the bubbles drive the suspended solids to move toward the surface of the wastewater until the suspended solids float on the surface of the wastewater. The rotating dust skimmer 31 makes the rotating door 33 in a horizontal state under the thrust of the wastewater, so that the suspended solids floating on the surface of the wastewater enter the dust skimmer 31 and are collected by the dust skimmer 31; the cylindrical load-bearing rod 11 drives the activated carbon plate 132 to rotate through the I-shaped support frame 130, and at the same time, under the stirring action of the activated carbon plate 132, the wastewater fully reacts with the chelating agent and flocculant; when the I-shaped support frame 130 drives the special-shaped support frame 40 to rotate, the special-shaped support frame 40 drives the arc scraper 41 to rotate synchronously, and the arc scraper 41 cleans the inner wall of the impurity removal tank 10 when rotating in the wastewater, and the water flows upward along the arc scraper 41 to wash upward, thereby driving the impurities to move upward, and the impurities enter the dust skimmer 31 with the water flow, and are collected by the dust skimmer 31.

[0067] S2 nitrification treatment: After the pretreatment of the wastewater in the impurity removal tank 10 is completed, the No. 1 water pump 140 is started to make the wastewater flow into the nitrification tank 5, and the nitrification tank 5 performs nitrification treatment on the wastewater. After the nitrification treatment is completed, the No. 2 water pump 150 is started to make the wastewater flow into the denitrification tank 20, and then the anaerobic ammonia oxidizing bacteria denitrify the wastewater.

[0068] S3 Denitrification treatment: After the wastewater enters the denitrification tank 20, the heating conduit 22 is energized and heats the liquid in the outer cavity area 23. The heat is transferred to the wastewater through the side wall of the denitrification tank 20 and the heat-conducting column 24, thereby uniformly heating the wastewater. When the wastewater reaches a temperature of 30-35°C, the heating conduit 22 stops energizing. When the wastewater temperature drops below 30°C, the heating conduit 22 continues to energize until the wastewater reaches a temperature of 30-35°C, thereby maintaining the best reaction environment for the anaerobic ammonia oxidizing bacteria. When the anaerobic ammonia oxidizing bacteria complete denitrification, the No. 2 water pump 150 is started to allow the wastewater to flow into the denitrification tank 20, and the water outlet 204 is opened at the same time. Under the squeezing effect of the newly inflowing wastewater, the wastewater after denitrification moves toward the circular mesh 201, and the circular mesh 201 filters the sludge in the wastewater. The wastewater moves to the water outlet 204 and flows out from the water outlet 204 to obtain clean water after denitrification.

[0069] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and therefore it is intended that all changes within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0070] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An anaerobic ammonia oxidation denitrification device for nitrogen-containing wastewater in rare earth mining areas, characterized by: It comprises a pretreatment mechanism (1) and a denitrification mechanism (2), wherein the pretreatment mechanism (1) and the denitrification mechanism (2) are both arranged on the ground; The pretreatment mechanism (1) comprises a de-impurity tank (10), a cylindrical load-bearing rod (11), an aeration unit (12) and a carbon adsorption unit (13); the de-impurity tank (10) is arranged on the ground and has an upper and lower layer structure; the cylindrical load-bearing rod (11) is vertically arranged inside the de-impurity tank (10); the aeration unit (12) is arranged at the bottom of the upper layer of the de-impurity tank (10); and the carbon adsorption unit (13) is sleeved on the cylindrical load-bearing rod (11); The denitrification mechanism (2) comprises a denitrification tank (20), an insulating outer tank (21), a heating pipe (22), an outer cavity area (23) and a heat-conducting column (24); the denitrification tank (20) is arranged on the ground; the insulating outer tank (21) is sleeved on the denitrification tank (20); the heating pipe (22) is arranged on the inner wall of the insulating outer tank (21); an outer cavity area (23) is arranged between the outer wall of the denitrification tank (20) and the inner wall of the insulating outer tank (21); and a plurality of the heat-conducting columns (24) are arranged horizontally inside the denitrification tank (20) at equal intervals along the vertical direction.

2. The anaerobic ammonia oxidation denitrification device for nitrogen-containing wastewater in rare earth mining areas according to claim 1, characterized in that: The aeration unit (12) comprises an aeration pipe (120), an air guide column (121), an aeration disc (122) and a rotating disc (123); the aeration pipe (120) is arranged at the bottom of the upper layer of the impurity removal tank (10), and the input end of the aeration pipe (120) is penetrated through the side wall of the impurity removal tank (10); a plurality of the air guide columns (121) are vertically penetrated through the top of the aeration pipe (120); a plurality of the aeration discs (122) are sleeved on the top of the air guide columns (121); the rotating disc (123) at the same horizontal position as the aeration disc (122) is sleeved on the cylindrical load-bearing rod (11), and the rotating disc (123) is tangent to the aeration disc (122).

3. The anaerobic ammonia oxidation denitrification device for nitrogen-containing wastewater in rare earth mining areas according to claim 1, characterized in that: The cylindrical load-bearing rod (11) is also provided with a dust skimming assembly (3), the dust skimming assembly (3) comprising an internal threaded cap (30), a dust skimming scoop (31), a first positioning column (32), a rotating door (33) and a torsion spring (34), the internal threaded cap (30) being threadedly connected to the top of the cylindrical load-bearing rod (11), a plurality of the dust skimming scoops (31) being equidistantly arranged on the outer wall of the internal threaded cap (30), a plurality of the first positioning columns (32) being horizontally arranged on the outer wall of the internal threaded cap (30), and Each dust skimmer (31) has two No. 1 positioning columns (32) distributed up and down at the spoon mouth. The rotating door (33) is arranged on the outer wall of the internal threaded cap (30) through a rotating shaft. The torsion spring (34) is sleeved on the rotating shaft of the rotating door (33) and is located between the internal threaded cap (30) and the rotating door (33). One end of the torsion spring (34) is passed through the internal threaded cap (30) and the other end is in contact with the rotating door (33), so that the rotating doors (33) distributed up and down are arranged opposite to each other in the vertical direction.

4. The anaerobic ammonia oxidation denitrification device for nitrogen-containing wastewater in rare earth mining areas according to claim 1, characterized in that: The carbon adsorption unit (13) comprises an I-shaped support frame (130), a second positioning column (131), an activated carbon plate (132) and an internal threaded cover (133); the I-shaped support frame (130) is sleeved on the cylindrical load-bearing rod (11) and is located between the rotating disc (123) and the internal threaded cap (30); the second positioning column (131) is horizontally penetrated through the cylindrical load-bearing rod (11) and is located at the bottom of the I-shaped support frame (130); the activated carbon plate (132) is symmetrically arranged on the I-shaped support frame (130); and the internal threaded cover (133) is threadedly connected to the cylindrical load-bearing rod (11) and is located at the top of the I-shaped support frame (130).

5. The anaerobic ammonia oxidation denitrification device for nitrogen-containing wastewater in rare earth mining areas according to claim 4, characterized in that: The I-shaped support frame (130) is also provided with a cleaning assembly (4), the cleaning assembly (4) comprising a special-shaped support frame (40), an arc-shaped scraper (41) and a guide plate (42), the special-shaped support frame (40) being symmetrically arranged on both sides of the I-shaped support frame (130), the arc-shaped scraper (41) being arranged at one end of the special-shaped support frame (40) away from the I-shaped support frame (130), and the arc-shaped scraper (41) being in contact with the inner wall of the impurity removal tank (10), and one end of the guide plate (42) being arranged at the top of the arc-shaped scraper (41), and the other end being arranged at a side of the dust skimmer (31) close to the arc-shaped scraper (41).

6. The anaerobic ammonia oxidation denitrification device for nitrogen-containing wastewater in rare earth mining areas according to claim 1, characterized in that: The impurity removal tank (10) is also provided with a No. 1 infusion pipe (14) and a No. 1 water pump (140), one end of the No. 1 infusion pipe (14) is penetrated through the outer wall of the impurity removal tank (10) and communicated with the upper layer of the impurity removal tank (10), the other end of the No. 1 infusion pipe (14) is provided with a nitrification tank (5) and penetrated through the outer wall of the nitrification tank (5), and the No. 1 water pump (140) is arranged on the No. 1 infusion pipe (14); the denitrification tank (20) is also provided with a No. 2 infusion pipe (15) and a No. 2 water pump (150), one end of the No. 2 infusion pipe (15) is penetrated through the outer wall of the nitrification tank (5) and the other end is penetrated through the outer wall of the denitrification tank (20), and the No. 2 water pump (150) is arranged on the No. 2 infusion pipe (15).

7. The anaerobic ammonia oxidation denitrification device for nitrogen-containing wastewater in rare earth mining areas according to claim 1, characterized in that: The denitrification tank (20) is also provided with a circular step (200), a circular mesh screen (201) and a handle (202); the circular step (200) is arranged on the inner wall of the denitrification tank (20); the circular mesh screen (201) is arranged on the top of the circular step (200); and the circular step (200) is located between the circular mesh screen (201) and the port of the second infusion tube (15); and two symmetrically distributed handles (202) are arranged on the top of the circular mesh screen (201).

8. The anaerobic ammonia oxidation denitrification device for nitrogen-containing wastewater in rare earth mining areas according to claim 1, characterized in that: The denitrification tank (20) is also provided with a U-shaped cover plate (203) and a water outlet (204); the U-shaped cover plate (203) is arranged on the top of the denitrification tank (20); the water outlet (204) is penetrated through the outer wall of the denitrification tank (20) and is located between the circular mesh screen (201) and the U-shaped cover plate (203).

9. The anaerobic ammonia oxidation denitrification device for nitrogen-containing wastewater in rare earth mining areas according to claim 1, characterized in that: The impurity removal tank (10) is also provided with a DC motor (16), which is arranged at the bottom of the lower layer of the impurity removal tank (10), and its output end is vertically upward and connected to the bottom of the cylindrical load-bearing rod (11).

10. A method for anaerobic ammonium oxidation denitrification of nitrogen-containing wastewater in rare earth mining areas, comprising an anaerobic ammonium oxidation denitrification device for nitrogen-containing wastewater in rare earth mining areas as claimed in any one of claims 1 to 9, characterized in that: A method for anaerobic ammonia oxidation denitrification of nitrogen-containing wastewater in rare earth mining areas is as follows: S1 wastewater pretreatment: the wastewater is poured into a de-impurity tank (10), a chelating agent and a flocculant are added, the pre-treatment mechanism (1) treats the wastewater, the aeration unit (12) releases ozone-containing gas into the wastewater, and the carbon adsorption unit (13) rotates in the wastewater to remove impurities; S2 nitrification treatment: After the wastewater pretreatment, nitrification reaction is carried out; S3 Denitrification treatment: After the nitrification reaction of the wastewater is completed, the wastewater flows into the denitrification tank (20), and the heating conduit (22) is energized. The heating conduit (22) heats the liquid in the outer cavity area (23) to a set temperature. The liquid passes through the inner wall of the denitrification tank (20) and the heat-conducting column (24) to heat the wastewater to a set temperature, so that the anaerobic ammonia-oxidizing bacteria can perform denitrification in a suitable temperature environment until the denitrification is completed.

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