Nitrate nitrogen reduction removal device

Abstract

The utility model belongs to the technical field of nitrate nitrogen removal, and relates to a nitrate nitrogen reduction removal device, in particular to a nitrate nitrogen reduction removal device which comprises a box body, a vertical partition plate is fixedly connected in the box body, the box body is divided into a first liquid storage box and a second liquid storage box through the vertical partition plate, and a solution supply device used for automatically supplying solution to the first liquid storage box is arranged on the box body. A plurality of first iron plates are fixedly arranged in the first liquid storage tank, a plurality of second iron plates are fixedly arranged in the second liquid storage tank, an iron plate connecting strip is fixedly arranged at the top end of the tank body, the first iron plates and the second iron plates are fixedly connected to the iron plate connecting strip, iron wires are wound around the first iron plates and the second iron plates, and an agar salt bridge is fixedly arranged at the top end of the vertical partition plate. The agar salt bridge is of a U-shaped structure, one end of the agar salt bridge extends into the first liquid storage tank, the other end of the agar salt bridge extends into the second liquid storage tank, a water inlet is formed in the upper portion of the second liquid storage tank, a water outlet is formed in the bottom of the second liquid storage tank, and a stirring assembly used for stirring liquid is arranged in the second liquid storage tank. The device is simple to operate and cost-saving.

Description

Technical Field

[0001] The utility model belongs to the technical field of removing nitrate nitrogen, and particularly relates to a nitrate nitrogen reduction and removal device. Background Art

[0002] The large-scale use of nitrogen fertilizers and low utilization rate have led to excessive accumulation of nitrates in the soil. The scouring effect of rainwater has brought nitrates in the soil into the water environment, resulting in excessive nitrate content in surface water and groundwater. The average nitrate concentration in my country's river water is 15.35 mg / L. The shallow groundwater in plain areas has poor water quality, and the main pollution indicators include nitrate nitrogen. Using traditional biochemical treatment processes to treat wastewater projects requires large investments, high operating costs, and it is difficult to achieve the expected results. Ion exchange and electrochemical methods are also commonly used to remove nitrate nitrogen, but these two treatment processes have the following defects: First, ion exchange resins are difficult to regenerate, require a large amount of eluent and are prone to scaling; electrochemistry requires a lot of energy consumption, and as the current increases, the nitrate reduction efficiency in the structure increases accordingly. The electrochemical method has very high requirements for the anode plate, and the initial investment in the plate using precious metal coatings is very huge; secondly, the general preparation method of ion exchange resins has the problem that the reagents used are highly carcinogenic and the transportation and operation of the amination reagents are difficult to control. The electrochemical reduction of nitrates has low selectivity for the product. Although high selectivity can be achieved by modifying precious metal electrodes such as platinum and palladium, precious metals are scarce and the modification cost is high.

[0003] Therefore, it is necessary to design a nitrate nitrogen reduction and removal device, the process design involved can not only remove nitrate nitrogen in surface water, groundwater and sewage but also reduce costs to a certain extent to achieve optimal operating conditions. Utility Model Content

[0004] The purpose of the utility model is to provide a nitrate nitrogen reduction and removal device to solve the problems existing in the above-mentioned prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a nitrate nitrogen reduction removal device, including a box body, a vertical partition is fixedly connected to the box body, the box body is divided into a liquid storage tank 1 and a liquid storage tank 2 by the vertical partition, the box body is provided with a solution replenishing device for automatically replenishing the liquid storage tank 1, a plurality of iron plates 1 are fixedly arranged in the liquid storage tank 1, a plurality of iron plates 2 are fixedly arranged in the liquid storage tank 2, an iron plate connecting strip is fixedly arranged at the top of the box body, and the iron plate 1 , the iron plate 2 is fixedly connected to the iron plate connecting strip, and the iron plate 1 and the iron plate 2 are both wrapped with iron wire, an agar salt bridge is fixedly provided on the top of the vertical partition, the agar salt bridge is a U-shaped structure, one end of the agar salt bridge extends into the liquid storage tank 1, and the other end of the agar salt bridge extends into the liquid storage tank 2, a water inlet is provided on the upper part of the liquid storage tank 2, a water outlet is provided on the bottom of the liquid storage tank 2, and a stirring component for stirring the liquid is provided in the liquid storage tank 2.

[0006] Preferably, the stirring assembly includes a motor fixedly mounted on the top of the second liquid storage tank, the output end of the motor is fixedly connected to a rotating shaft, the rotating shaft extends into the second liquid storage tank, and a plurality of stirring blades are arranged on the outer wall of the rotating shaft at equal intervals along the circumferential direction.

[0007] Preferably, a float switch is fixedly installed on the upper part of the inner wall of the second liquid storage tank, an electromagnetic valve is installed on the water inlet, and the float switch is electrically connected to the electromagnetic valve.

[0008] Preferably, the water outlet is fixedly connected to a pipeline, and a flow meter and a nitrate nitrogen detection device are fixedly installed on the pipeline.

[0009] Preferably, the solution replenishing device includes a supply box fixedly mounted on the outer wall of the box body, the bottom end of the supply box is fixedly connected to one end of a conduit, the other end of the conduit extends into the liquid storage tank 1, the conduit is provided with a solenoid valve, the liquid storage tank 1 is provided with a liquid concentration meter, a microcontroller is fixedly mounted on the outer wall of the supply box, and the solenoid valve and the liquid concentration meter are both electrically connected to the microcontroller.

[0010] Preferably, the iron wire is high carbon iron wire.

[0011] Preferably, a plurality of heating rods are fixedly installed inside the liquid storage tank 1 and the liquid storage tank 2.

[0012] Compared with the prior art, the utility model has the following advantages and technical effects:

[0013] The utility model provides a nitrate nitrogen reduction and removal device, which can stir the water to be treated in the second liquid storage tank through the stirring component, so that the water to be treated flows turbulently in the second liquid storage tank, so that the nitrate nitrogen in the water to be treated reacts more fully with the iron wire wrapped by the second iron plate, and the high concentration of Fe in the first liquid storage tank is reduced. 2+ The liquid acts as the cathode, and the high concentration of nitrate in the liquid storage tank 2 acts as the anode. Under the action of the agar salt bridge, a concentration cell is formed, which accelerates the corrosion of the iron plate 2 in the liquid storage tank 2. The electrons in the external circuit are transferred by the iron wire on the iron plate 1, the iron wire on the iron plate 2 and the iron plate connecting strip, and the electrons in the internal circuit are transferred by the agar salt bridge, and the nitrate nitrogen is reduced and removed.

[0014] The solution replenishment device can detect the high concentration of Fe in the liquid storage tank in real time. 2+ The concentration of the liquid is measured and automatically replenished to ensure the normal operation of the device in the utility model.

[0015] The utility model is easy to operate and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor:

[0017] Figure 1 This is a front view of a nitrate nitrogen reduction and removal device proposed by the utility model;

[0018] Figure 2 This is a top view of a nitrate nitrogen reduction and removal device proposed by the utility model;

[0019] Among them: 1. Box body; 2. Vertical partition; 3. Iron plate one; 4. Iron plate two; 5. Agar salt bridge; 6. Water inlet; 7. Water outlet; 8. Pipeline; 9. Flow meter; 10. Nitrate nitrogen detection device; 11. Motor; 12. Rotating shaft; 13. Stirring blade; 14. Iron plate connecting strip; 15. Float switch; 16. Heating rod; 17. Supply box; 18. Liquid concentration meter; 19. Solenoid valve. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Reference Figure 1 to Figure 2 As shown, the utility model provides a nitrate nitrogen reduction removal device, including a box body 1, a vertical partition 2 is fixedly connected to the box body 1, the box body 1 is divided into a liquid storage tank 1 and a liquid storage tank 2 by the vertical partition 2, the box body 1 is provided with a solution replenishing device for automatically replenishing the liquid storage tank 1, a plurality of iron plates 1 3 are fixedly arranged in the liquid storage tank 1, a plurality of iron plates 2 4 are fixedly arranged in the liquid storage tank 2, an iron plate connecting strip 14 is fixedly arranged at the top of the box body 1, and the iron plates are connected to the box body 1. Iron plate one 3 and iron plate two 4 are fixedly connected to the iron plate connecting strip 14, and iron plates one 3 and iron plates two 4 are wrapped with iron wire. An agar salt bridge 5 is fixedly arranged on the top of the vertical partition 2. The agar salt bridge 5 is a U-shaped structure. One end of the agar salt bridge 5 extends into the liquid storage tank one, and the other end of the agar salt bridge 5 extends into the liquid storage tank two. A water inlet 6 is arranged on the upper part of the liquid storage tank two, and a water outlet 7 is arranged on the bottom of the liquid storage tank two. A stirring component for stirring the liquid is arranged in the liquid storage tank two.

[0023] In this embodiment, the box body 1 and the vertical partition 2 are insulators, the iron plate 1 3, the iron plate 2 4 and the iron plate connecting strip 14 are made of the same material and are integrally formed, and a plurality of holes are provided on the iron plate 1 3 and the iron plate 2 4 to increase the fluidity of the liquid. It should be noted that the liquid levels of the liquid storage tank 1 and the liquid storage tank 2 are lower than the height of the vertical partition 2, and the two ends of the iron plate 1 3 and the iron plate 2 4 and the agar salt bridge 5 are all immersed in the liquid. The liquid storage tank 1 contains 0.01 mol / L Fe 2+ The solution is prepared from ammonium ferrous sulfate Fe(NH4)2·(SO4)2·6H2O, and the storage tank contains 0.01 mol / L Fe 2+ ,0.02mol / L NH4 + , 0.02mol / L SO4 2- As the reaction proceeds, Fe 2+ The concentration of other substances is constantly decreasing, and the concentration of other substances remains unchanged; the main component of the water to be treated in the second storage tank is 85 mg / L nitrate nitrogen (in terms of N). After the reaction is completed, the components in the second storage tank are nitrate nitrogen, nitrite nitrogen, ammonia nitrogen, Fe 2+ , Fe3+ To ensure the effective reaction, the Fe in the liquid storage tank needs to be replenished. 2+ Solution concentration, and regular replacement of the iron wire wrapped around iron plate 1 3 and iron plate 2 4.

[0024] The stirring assembly provided in the utility model can stir the water to be treated in the liquid storage tank 2, so that the water to be treated flows turbulently in the liquid storage tank 2, so that the nitrate nitrogen in the water to be treated reacts more fully with the iron wire wound on the iron plate 2 4. At this time, the liquid storage tank 1 is used as a cathode, which contains a high concentration of Fe 2+ The liquid loses electrons and is reduced to iron and attached to the iron wire. The second liquid storage tank is used as the anode, which contains the iron wire in the high concentration nitrate to obtain electrons and precipitate low concentration Fe 2+ Under the action of the agar salt bridge 5, a concentration cell is formed, which accelerates the corrosion of the iron wire wrapped on the iron plate 2 4 in the liquid storage tank 2. The electrons of the external circuit are transferred by the iron wire wrapped on the iron plate 1 3 and the iron wire wrapped on the iron plate 2 4 and the iron plate connecting plate, and the electrons of the internal circuit are transferred by the agar salt bridge 5, and the nitrate nitrogen is removed by reduction.

[0025] The solution replenishment device can detect the high concentration of Fe in the liquid storage tank in real time. 2+ The concentration of the liquid is measured and automatically replenished to ensure the normal operation of the device in the utility model.

[0026] The utility model is easy to operate and saves costs.

[0027] Furthermore, the stirring assembly includes a motor 11 fixedly mounted on the top of the second liquid storage tank, the output end of the motor 11 is fixedly connected to a rotating shaft 12, the rotating shaft 12 extends into the second liquid storage tank, and a plurality of stirring blades 13 are arranged on the outer wall of the rotating shaft 12 at equal intervals along the circumferential direction.

[0028] By rotating the motor 11, the motor 11 drives the rotating shaft 12 and the stirring blade 13 to rotate, thereby stirring the liquid in the second liquid storage tank.

[0029] Furthermore, a float switch 15 is fixedly installed on the upper part of the second inner wall of the liquid storage tank, and an electromagnetic valve is installed on the water inlet 6, and the float switch 15 is electrically connected to the electromagnetic valve.

[0030] The float switch 15 is provided to detect the change of the liquid level in the second liquid storage tank, and transmit the signal to the electromagnetic valve to control the on-off of the pipeline on the water inlet 6, so as to prevent the liquid level in the liquid storage tank from being too high and overflowing the vertical partition 2 into the first liquid storage tank, and also prevent the liquid level in the liquid storage tank from being too low, causing the bottom end of the agar salt bridge 5 to leak out of the water surface, thereby interrupting the chemical reaction.

[0031] Furthermore, the water outlet 7 is fixedly connected to a pipeline 8 , on which a flow meter 9 and a nitrate nitrogen detection device 10 are fixedly installed.

[0032] In this embodiment, the nitrate nitrogen detection device 10 is a commercially available part, and its working principle is the prior art and will not be described in detail here.

[0033] The flow meter 9 can monitor the discharge volume of the water outlet 7 in real time, and the nitrate nitrogen detection device 10 can detect the nitrate nitrogen concentration in the treated water. If the concentration exceeds the preset value, the discharge volume of the water outlet 7 can be appropriately reduced to increase the response time.

[0034] Furthermore, the solution replenishing device includes a replenishing box 17 fixedly mounted on the outer wall of the box body 1, the bottom end of the replenishing box 17 is fixedly connected to one end of a conduit, the other end of the conduit extends into a liquid storage tank 1, an electromagnetic valve 19 is arranged on the conduit, a liquid concentration meter 18 is arranged in the liquid storage tank 1, a microcontroller is fixedly mounted on the outer wall of the replenishing box 17, and the electromagnetic valve 19 and the liquid concentration meter 18 are both electrically connected to the microcontroller.

[0035] The concentration of the solution in the liquid storage tank 1 is monitored by the liquid concentration meter 18, and the monitoring information is transmitted to the microcontroller. When the preset threshold is exceeded, the microcontroller controls the solenoid valve 19 to open and supply high concentration Fe to the liquid storage tank 1 through the conduit. 2+ solution until the Fe 2+ When the concentration reaches a preset threshold, the microcontroller controls the electromagnetic valve 19 to close, thereby ensuring the normal operation of the device in the utility model.

[0036] Furthermore, in order to improve the reaction strength, the iron wire is a high-carbon iron wire.

[0037] Furthermore, a plurality of heating rods 16 are fixedly installed inside the liquid storage tank 1 and the liquid storage tank 2.

[0038] The heating rod 16 can increase the temperature of the liquid and improve the reaction rate.

[0039] The nitrate nitrogen reduction and removal device provided by the utility model has a working principle: when in use, a certain amount of high-concentration Fe 2+ Solution, high concentration Fe 2+ The solution needs to cover the bottom of the agar salt bridge 5 and the iron plate 1 3, and the water to be treated is injected into the liquid storage tank 2 through the water inlet 6. With the injection of the water to be treated, the liquid level in the liquid storage tank 2 gradually rises until the float switch 15 is triggered, and the triggering float switch 15 inputs a signal to the electromagnetic valve, and the electromagnetic valve is closed. At this time, the liquid level just covers the bottom of the agar salt bridge 5 and the iron plate 2 4, and the motor 11 is started. The motor 11 rotates, and the motor 11 drives the rotating shaft 12 and the stirring blade 13 to rotate, so that the water to be treated is turbulent in the liquid storage tank 2, so that the nitrate nitrogen in the water to be treated reacts more fully with the iron wire wrapped on the iron plate 2 4. At this time, the liquid storage tank 1 acts as a cathode, which is filled with high concentration Fe 2+The liquid loses electrons and is reduced to iron and attached to the iron wire. The second liquid storage tank is used as the anode, which contains the iron wire in the high concentration nitrate to obtain electrons and precipitate low concentration Fe 2 + , under the action of agar salt bridge 5, a concentration cell is formed, and the specific reaction is as follows:

[0040] Anode reaction:

[0041] Cathode reaction:

[0042] Overall reaction:

[0043] Ignoring the influence of ionic strength, when the water temperature is 25°C, the Nernst equation is:

[0044]

[0045] ΔG=-nFE=-nFE

[0046] Fe in tank 1 2+ Concentration and Fe in tank 2 2+ The greater the concentration ratio, the greater E, n, F, and E are all positive values, thus obtaining:

[0047] ΔG0

[0048] The mixing reaction will proceed spontaneously in the direction of the overall reaction as written.

[0049] The nitrate nitrogen reduction principle is:

[0050]

[0051] Iron reacts with nitrate nitrogen to generate nitrogen gas, and also reacts to generate a small amount of nitrite nitrogen and ammonia nitrogen. After the nitrate nitrogen detection device 10 monitors and meets the standard, water is discharged through the outlet 7, and the displacement of the pipeline 8 is monitored by the set flow meter 9. The staff can adjust the drainage of the outlet 7 through the indications displayed by the flow meter 9 and the nitrate nitrogen detection device 10. At the same time, as the liquid in the liquid storage tank 2 is discharged, the liquid level drops, and the float switch 15 controls the electromagnetic valve on the water inlet 6 to open for water replenishment; as the Fe in the liquid storage tank 1 2+ The concentration decreases, which is monitored by the liquid concentration meter 18 and transmitted to the microcontroller. When it exceeds the preset threshold, the microcontroller controls the solenoid valve 19 to open and supply high-concentration Fe to the liquid storage tank through the conduit. 2+ solution until the Fe 2+ When the concentration reaches a preset threshold, the microcontroller controls the electromagnetic valve 19 to close, thereby ensuring the normal operation of the device in the utility model.

[0052] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0053] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A nitrate nitrogen reduction and removal device, characterized in that: The invention comprises a box body (1), wherein a vertical partition (2) is fixedly connected inside the box body (1), and the box body (1) is divided into a liquid storage tank 1 and a liquid storage tank 2 by the vertical partition (2), and the box body (1) is provided with a solution replenishing device for automatically replenishing the liquid storage tank 1, and a plurality of iron plates 1 (3) are fixedly arranged inside the liquid storage tank 1, and a plurality of iron plates 2 (4) are fixedly arranged inside the liquid storage tank 2, and an iron plate connecting strip (14) is fixedly arranged at the top end of the box body (1), and the iron plates 1 (3) and 2 (4) are fixedly connected. On the iron plate connecting strip (14), the iron plate one (3) and the iron plate two (4) are both wound with iron wires, an agar salt bridge (5) is fixedly arranged at the top of the vertical partition (2), the agar salt bridge (5) is a U-shaped structure, one end of the agar salt bridge (5) extends into the liquid storage tank one, and the other end of the agar salt bridge (5) extends into the liquid storage tank two, a water inlet (6) is arranged at the top of the liquid storage tank two, a water outlet (7) is arranged at the bottom of the liquid storage tank two, and a stirring component for stirring the liquid is arranged in the liquid storage tank two.

2. The nitrate nitrogen reduction and removal device according to claim 1, characterized in that: The stirring assembly comprises a motor (11) fixedly mounted on the top end of the second liquid storage tank, the output end of the motor (11) is fixedly connected to a rotating shaft (12), the rotating shaft (12) extends into the second liquid storage tank, and a plurality of stirring blades (13) are arranged on the outer wall of the rotating shaft (12) at equal intervals along the circumferential direction.

3. The nitrate nitrogen reduction and removal device according to claim 1, characterized in that: A float switch (15) is fixedly mounted on the upper portion of the inner wall of the second liquid storage tank, an electromagnetic valve is mounted on the water inlet (6), and the float switch (15) is electrically connected to the electromagnetic valve.

4. The nitrate nitrogen reduction and removal device according to claim 1, characterized in that: The water outlet (7) is fixedly connected to a pipeline (8), and a flow meter (9) and a nitrate nitrogen detection device (10) are fixedly installed on the pipeline (8).

5. The nitrate nitrogen reduction and removal device according to claim 1, characterized in that: The solution replenishing device comprises a replenishing box (17) fixedly mounted on the outer wall of the box body (1); the bottom end of the replenishing box (17) is fixedly connected to one end of a conduit, the other end of the conduit extends into the liquid storage tank 1, the conduit is provided with a solenoid valve (19), the liquid storage tank 1 is provided with a liquid concentration meter (18), a microcontroller is fixedly mounted on the outer wall of the replenishing box (17), and the solenoid valve (19) and the liquid concentration meter (18) are both electrically connected to the microcontroller.

6. The nitrate nitrogen reduction and removal device according to claim 1, characterized in that: The iron wire is a high carbon iron wire.

7. The nitrate nitrogen reduction and removal device according to claim 1, characterized in that: A plurality of heating rods (16) are fixedly installed inside the first liquid storage tank and the second liquid storage tank.

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