CN216785795U - Device for treating anaerobic digestion wastewater and recycling nitrogen and phosphorus resources by using magnesium-air battery - Google Patents
Device for treating anaerobic digestion wastewater and recycling nitrogen and phosphorus resources by using magnesium-air battery Download PDFInfo
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- CN216785795U CN216785795U CN202220233532.XU CN202220233532U CN216785795U CN 216785795 U CN216785795 U CN 216785795U CN 202220233532 U CN202220233532 U CN 202220233532U CN 216785795 U CN216785795 U CN 216785795U
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Abstract
The utility model discloses a device for treating anaerobic digestion wastewater and recovering nitrogen and phosphorus resources by a magnesium-air battery, wherein a cathode and an anode respectively adopt an air electrode and a magnesium electrode, anaerobic digestion wastewater is added into a cathode chamber, and a sodium chloride solution is added into an anode chamber to serve as electrolyte; the negative chamber and the positive chamber are separated by a cation exchange membrane and are connected by an external lead. The magnesium anode loses electrons due to the potential difference, and the generated magnesium ions pass through a cation exchange membrane to react with ammonium radicals and phosphate in the anolyte to generate struvite; electrons reach the air electrode through the external lead, and oxygen in the air receives the electron reaction to generate OH‑(ii) a The magnesium ions and other cations in the battery pass through the cation exchange membrane to form a loop, and an open-circuit voltage of 1.3V can be generated in an external circuit. The method takes magnesium ions generated in situ by the magnesium electrode as a phosphorus removal agent, realizes nitrogen and phosphorus removal of the wastewater on the premise of not introducing other impurity ions, and can also recover nitrogen and phosphorus resources and electric energy in the wastewater.
Description
Technical Field
The utility model relates to the technical field of fuel cells, in particular to a device for treating anaerobic digestion wastewater and recycling nitrogen and phosphorus resources by a magnesium-air battery.
Background
Nitrogen and phosphorus are indispensable elements in the organism, and are the basis for the survival of all organisms. At present, nitrogen and phosphorus resources in the world are in shortage, and if a large amount of nitrogen and phosphorus contained in the wastewater is not removed in time, eutrophication of a water body is caused, so that the removal and recovery of the nitrogen and phosphorus in the wastewater become a current research hotspot. There are many methods for removing nitrogen and phosphorus from wastewater: biological methods, chemical precipitation methods, and electrochemical methods. The traditional biological method transfers phosphorus in the wastewater into sludge, converts ammonia nitrogen, nitrate and the like into nitrogen and releases the nitrogen into the air, and although the removal of nitrogen and phosphorus is completed, nitrogen and phosphorus resources are not recovered. The chemical precipitation method is to add magnesium salt into the wastewater on the basis of adjusting the alkalinity of the wastewater to form struvite precipitate, and although nitrogen and phosphorus resources are recovered in the process in the form of struvite, new impurity ions are introduced by adding the magnesium salt. The electrochemical method can form struvite sediment under the condition of not introducing other impurity ions, but consumes a large amount of electric energy in the process.
SUMMERY OF THE UTILITY MODEL
Aiming at anaerobic digestion wastewater, the utility model provides a device for treating anaerobic digestion wastewater and recovering nitrogen and phosphorus resources by using a magnesium-air battery, wherein the device utilizes a magnesium electrode to realize the transfer of electrons from an anode to a cathode and generate electric energy for utilization; the magnesium anode loses electrons, and the generated soluble divalent magnesium passes through the cation exchange membrane and then reacts with ammonium radicals and phosphate of the cathode to generate struvite, so that the nitrogen and phosphorus removal of the wastewater is realized, and nitrogen and phosphorus resources are recovered.
In order to achieve the purpose, the utility model adopts the following specific technical scheme:
the magnesium-air battery treats the anaerobic digestion waste water and reclaims the apparatus of the nitrogen phosphorus resource, including cathode chamber, anode chamber, product collecting hopper and waste water circulation system, there are routes communicated between anode chamber and the cathode chamber, there are cation exchange membranes in the route; an air cathode is arranged in an inner cavity of the cathode chamber, a cathode chamber water inlet and a cathode chamber water outlet are arranged on the cathode chamber, and the cathode chamber water inlet and the cathode chamber water outlet are connected with a wastewater circulating system; the product collecting hopper is arranged at the bottom of the cathode chamber, and the bottom of the product collecting hopper is provided with a sludge discharge port; a magnesium electrode is arranged in the anode chamber, and an anode chamber water inlet is also arranged on the anode chamber; the electrolyte in the anode chamber is sodium chloride solution.
Preferably, the cation exchange membrane is arranged opposite to the air cathode and the magnesium electrode, the cathode chamber water inlet and the cathode chamber water outlet are respectively arranged on two sides of the cation exchange membrane and two sides of the air cathode, and the cathode chamber water inlet is lower than the cathode chamber water outlet.
Preferably, the sludge discharge port at the bottom of the product collecting hopper comprises a product discharge pipe, a closed flange is arranged on the product discharge pipe, and a water stop clamping plate is arranged on the closed flange.
Preferably, the wastewater circulating system comprises an anaerobic digestion solution inlet, a water inlet pipe, a circulating pump, a connecting pipe, a liquid storage tank, a water outlet pipe and an anaerobic digestion solution outlet, wherein the anaerobic digestion solution inlet is connected with the water outlet of the cathode chamber, and the anaerobic digestion solution outlet is connected with the water inlet of the cathode chamber; the anaerobic digestion liquid outlet is connected with the liquid storage tank through a water outlet pipe, the liquid level in the liquid storage tank is higher than the level of the water inlet of the cathode chamber, the water outlet of the circulating pump is connected with the liquid storage tank through a connecting pipe, and the water inlet of the circulating pump is connected with the anaerobic digestion liquid inlet.
Preferably, the top of the anode chamber is provided with a clamping groove for the magnesium electrode to enter and exit.
Preferably, titanium wires are connected to the magnesium electrode and the air cathode, the titanium wires connected to the magnesium electrode extend from the clamping grooves to the outside of the anode chamber, and the titanium wires connected to the air cathode extend to the outside of the cathode chamber.
Preferably, the water inlet of the anode chamber is positioned at the upper part of the anode chamber.
Preferably, each 3.1-4.2cm3The anode chambers are correspondingly configured to be 1-1.3cm2The magnesium electrode of (1); every 2-2.5cm3The cathode chamber is correspondingly arranged by 1-1.25cm22-2.5cm per cathode3The cathode chamber is correspondingly arranged by 1-1.25cm2The cation exchange membrane of (1).
The utility model has the following beneficial effects:
the device for treating anaerobic digestion wastewater and recovering nitrogen and phosphorus resources by using the magnesium-air battery utilizes the zero-valent magnesium with extremely strong reducibility as the anode, so that the reaction rate is high; anaerobic digestion wastewater containing ammonium radicals and phosphate is used as catholyte, the magnesium anode loses electrons, and generated magnesium ions pass through a cation exchange membrane to react with the ammonium radicals and the phosphate in the catholyte to generate struvite which is a high-quality fertilizer, so that the resource utilization of the wastewater is realized; meanwhile, when the magnesium electrode and the air electrode are connected with a power consumption load or an electric energy recovery device, the purpose of generating electric energy can be achieved; the wastewater circulating system enables the concentration of ammonium radicals and phosphate in the cathode chamber to be maintained at a high level, and ensures the reaction efficiency and stable power generation capacity. Because the anode chamber adopts a neutral sodium chloride solution as an electrolyte solution, magnesium ions generated by electron loss of the magnesium anode are not easy to deposit on the surface of the magnesium anode to form a passivation layer to prevent the reaction from continuing, thereby ensuring the continuous and efficient reaction, and the magnesium ions can reach the cathode through a cation exchange membrane and react with ammonium radicals and phosphate in catholyte to generate struvite; the electrons lost by the magnesium electrode are transmitted to the air cathode through the lead, and the oxygen receives the electrons on the air cathode to generate OH-And a good pH environment is provided for the generation of struvite, so that the magnesium-air battery does not need to add extra alkali to control the pH, thereby reducing the operation cost.
Drawings
FIG. 1 is an overall view of an apparatus for treating anaerobic digestion wastewater and recovering nitrogen and phosphorus resources using a magnesium-air battery according to the present invention;
FIG. 2 is an overall view of a cathode chamber and an anode chamber of the present invention;
FIG. 3 is an overall view of an anode chamber of the present invention;
FIG. 4 is a sectional view of the cathode chamber and anode chamber integrated structure of the present invention;
fig. 5 is a plan view of an integrated structure of a cathode chamber and an anode chamber according to the present invention.
In the figure: a-cathode chamber, B-anode chamber, 1-1-anaerobic digestion liquid inlet, 1-2-water inlet pipe, 1-3-90 degree elbow, 1-4-circulating pump, 1-5-connecting pipe, 1-6-liquid storage tank, 1-7-water outlet pipe, 1-8-anaerobic digestion liquid outlet, 2-support frame, 3-product discharge pipe, 4-product collecting hopper, 5-air cathode, 6-electric signal collecting system, 7-electric load, 8-magnesium electrode, 9-shell fixing screw, 10-sealing flange, 11-titanium wire, 12-connecting bolt, 13-anode chamber water inlet, 14-clamping groove, 15-wire hole, 16-cation exchange membrane, 16-anion exchange membrane, 17-a water stop splint, 18-screws, 19-screw holes, 20-sealing rings, 22-an external lead, 23-a cathode chamber water inlet and 24-a cathode chamber water outlet.
Detailed Description
The utility model is further described with reference to the following specific drawings and detailed description. The preferred embodiments may be combined in any combination, unless otherwise specified or conflicting.
As shown in fig. 1 to 5, the device for treating anaerobic digestion wastewater and recycling nitrogen and phosphorus resources by using the magnesium-air battery comprises a cathode chamber a and an anode chamber B, wherein a cation exchange membrane 16 is arranged in a channel between the cathode chamber a and the anode chamber B and is hermetically connected with the cathode chamber B through a sealing ring 20, the cathode chamber a is provided with a cathode chamber water outlet 24, an air cathode 5, a cathode chamber water inlet 23 and a product collecting hopper 4 from top to bottom, the cathode chamber water outlet 24 is connected with the cathode chamber water inlet 23 through a wastewater circulating system, the air cathode 5 is connected with a titanium wire 11, the titanium wire 11 extends to the outside of the cathode chamber a, and the bottom of the cathode chamber a is provided with the product collecting hopper 4; the anode chamber B is provided with an anode chamber water inlet 13, a clamping groove 14 and a magnesium electrode 8, the anode chamber water inlet 13 is positioned at the center of the top of the anode chamber B, and the anode chamber water inlet also serves as an exhaust hole in the reaction; the clamping groove 14 is located on one side of the top of the anode chamber B, the clamping groove 14 is opposite to the air cathode 5 of the cathode chamber A, the magnesium electrode 8 is lowered from the clamping groove 14 to the inner cavity of the anode chamber B, the titanium wire 11 is connected onto the magnesium electrode 8, the titanium wire 11 extends to the outside of the anode chamber B, and the titanium wire outside the cathode chamber A can be connected with the electric load 7 through the external lead 22.
As a preferred embodiment of the present invention, as shown in FIG. 2, the volume ratio of the cathode chamber A to the anode chamber B is 1:1, in the cathode chamber A, the distance from the cathode chamber water outlet 24 to the top of the cathode chamber A is 1/4 the total height of the cathode chamber A, the distance from the cathode chamber water inlet 23 to the bottom of the cathode chamber A is 1/4 the total height of the cathode chamber A, the ratio of the cathode chamber water outlet 24 to the inner diameter of the cathode chamber water inlet 23 is 1:1, in the anode chamber B, the ratio of the inner diameters of the anode chamber water inlet 13 and the cathode chamber water inlet 23 is 1:1, the neck 14 is square, the distance from the neck 14 to the side of the anode chamber B (left side shown in FIG. 2) is 1/10 the total length of the anode chamber, the width of the neck 14 is 0.3mm-0.5mm, the magnesium electrode 8 is provided with a wire hole 15, the distance from the wire hole 15 to the upper end of the magnesium electrode 8 is 1/10 the total height of the magnesium electrode 8, the ratio of the diameter of the wire hole 15 to the diameter of the titanium wire 11 is 1: 1.
As a preferred embodiment of the present invention, as shown in FIG. 3, after the titanium wire 11 is passed through the wire hole 15 to fix the magnesium electrode 8, the magnesium electrode 8 is put into the anode chamber B from the neck 14, and when the magnesium electrode 8 is replaced, the titanium wire 11 is pulled to pull out the original magnesium electrode 8 for replacement.
As a preferred embodiment of the utility model, as shown in fig. 1, fig. 2 and fig. 4, a product collecting hopper 4 is arranged at the bottom of a cathode chamber a, the product collecting hopper 4 is of a chamfered table structure, the inclination angle of the product collecting hopper 4 is 58-62 degrees, a product discharging pipe 3 is connected at the lower end, a water-stopping splint 17 is fixed on the product discharging pipe 3, and the water-stopping splint 17 is opened every 1-4 days to collect the products of nitrogen and phosphorus removal.
As a preferred embodiment of the utility model, as shown in figure 1, the wastewater circulating system comprises an anaerobic digestion solution inlet 1-1, a water inlet pipe 1-2, a 90-degree elbow 1-3, a circulating pump 1-4, a connecting pipe 1-5, a liquid storage tank 1-6, a water outlet pipe 1-7 and an anaerobic digestion solution outlet 1-8, wherein the anaerobic digestion solution inlet 1-1 is arranged at the upper part of one side of a cathode chamber A and is connected with a water outlet 24 of the cathode chamber, and the liquid level in the cathode chamber A is higher than the water outlet 24 of the cathode chamber; anaerobic digestion solution outlets 1-8 are arranged at the lower part of the other side of the cathode chamber A and are connected with a cathode chamber water inlet 23; the anaerobic digestion liquid inlet 1-1 is connected with the liquid storage tank 1-6 through the water inlet pipe 1-2, the connection point is positioned below the liquid level of the liquid storage tank 1-6, the level height of the liquid level of the liquid storage tank 1-6 is higher than that of the water inlet 23 of the cathode chamber, so that the wastewater in the liquid storage tank 1-6 can flow into the cathode chamber A under the action of gravity, the water outlet of the circulating pump 1-4 is connected with the liquid storage tank 1-6 through the connecting pipe 1-5, and the water inlet of the circulating pump 1-4 is connected with the anaerobic digestion liquid outlet 1-8 through the water inlet pipe 1-2.
As a preferred embodiment of the present invention, as shown in FIG. 1, the ratio of the volume of the reservoir 1-6 to the total volume of the cathode chamber A and the anode chamber B is 15: 26.
As a preferred embodiment of the present invention, as shown in FIG. 1 and FIG. 2, anaerobic digestion wastewater with ammonia nitrogen concentration of 3420-8118mg/L and phosphate concentration of 95-9500mg/L is fed into the cathode chamber A, and 0.01-0.1mol/L sodium chloride solution is used as electrolyte in the anode chamber B.
As a preferred embodiment of the present invention, as shown in FIGS. 1 and 2, each 3.1 to 4.2cm3The cathode chamber A is correspondingly configured to be 1-1.3cm2The magnesium electrode 8; every 2-2.5cm3The cathode chamber A is correspondingly configured to be 1-1.25cm22-2.5cm per cathode (c)3The cathode chamber A is correspondingly configured to be 1-1.25cm2The cation exchange membrane 16.
As a preferred embodiment of the present invention, as shown in fig. 1 and fig. 2, the cathode chamber a and the anode chamber B are separated by a plexiglass plate, the plexiglass plate is provided with an opening, the cation exchange membrane 16 is fixed at the opening of the plexiglass plate by a sealing ring 20, the cavity of the cathode chamber a is hermetically connected with the plexiglass plate by the sealing ring 20, and the plexiglass plate is hermetically connected with the cathode chamber a by the sealing ring 20. 4 connecting bolts 12 sequentially penetrate through the organic glass cover plate, the anode chamber B, the hollow organic glass plate, the cathode chamber A and the organic glass cover plate from left to right, are screwed and fixed at two ends of the connecting bolts 12 by using shell fixing screws 9, are connected into an integral structure and are placed on the support frame.
In the device for treating anaerobic digestion wastewater and recovering nitrogen and phosphorus resources by using the magnesium-air battery, the cathode and the anode respectively adopt the magnesium electrode and the air electrode, the anaerobic digestion wastewater is added into the cathode chamber, and the sodium chloride solution is added into the anode chamber to serve as electrolyte; the negative and positive chambers are separated by a cation exchange membrane, and the negative and positive electrodes are connected by an external lead to form a primary battery system. The magnesium anode loses electrons due to the potential difference between the magnesium anode and the air cathode, the electrons reach the air cathode through an external lead, oxygen in the air reaches the catalyst layer through the collection of the gas collecting layer, and reacts with the electrons received by the cathode to generate OH under the action of the Pt/C catalyst-The device provides a good pH condition for denitrification and dephosphorization of anaerobic digestion wastewater, and can generate 1.3V open-circuit voltage in an external circuit; magnesium ions generated by electron loss of the magnesium anode pass through the cation exchange membrane to reach the cathode to react with phosphate and ammonium radicals in the catholyte to generate struvite (MgNH)4PO4·6H2O), an open circuit voltage of 1.3V may be generated in the external circuit. The device realizes nitrogen and phosphorus removal of wastewater by using magnesium ions generated in situ by the magnesium electrode on the premise of not introducing other impurity ions, and simultaneously can recover nitrogen and phosphorus resources and electric energy in the wastewater.
The method for treating anaerobic digestion wastewater and recovering nitrogen and phosphorus resources can treat wastewater containing ammonium radicals and phosphate by utilizing zero-valent magnesium under the condition of not introducing other impurity ions to obtain struvite, realizes nitrogen and phosphorus removal of the wastewater and recovery of electric energy, and has strong zero-valent magnesium reducibility, so that the reaction speed is high, the anode is not easy to passivate by a cation exchange membrane in a reaction device, the pH of catholyte is suitable for the generation of the struvite, and the continuous, efficient and low-cost operation of the reaction is ensured.
Examples
As shown in fig. 1 to 5, the apparatus for treating anaerobic digestion wastewater and recovering nitrogen and phosphorus resources by using a magnesium-air battery of the present embodiment comprises a cathode chamber a, an anode chamber B, an external connection device and a support frame 2, wherein the cathode chamber a and the anode chamber B are hollow cavities, the hollow cavity in which a cation exchange membrane 16 is located is arranged between the cathode chamber a and the anode chamber B, a sealing ring 20 is arranged at the connection part of the cavities and the cavities, screw holes 19 are formed around all the cavities and are connected in series by a connection bolt 12, and a housing fixing screw 9 is fixed at both ends of the connection bolt 12; the cathode chamber A is connected with a wastewater circulating system which comprises an anaerobic digestion solution inlet 1-1, a water inlet pipe 1-2, a 90-degree elbow 1-3, a circulating pump 1-4, a connecting pipe 1-5, a liquid storage tank 1-6, a water outlet pipe 1-7 and an anaerobic digestion solution outlet 1-8; the cathode chamber A and the anode chamber B transfer mass through the cation exchange membrane 16; an anode chamber water inlet 13, a clamping groove 14, a titanium wire 11 and a magnesium anode 8 are arranged on the anode chamber B; the external connecting equipment comprises an electric signal acquisition system 6, an electric load 7, a shell fixing screw 9 and an external lead 22; after the cathode chamber A, the anode chamber B and the external connecting equipment are assembled and connected, the magnesium-air battery main body is arranged on the support frame 2 and fixed.
As shown in fig. 1 and 2, the air electrode 5 is arranged on the right side of the inner cavity of the cathode chamber a, the right side surface of the air electrode 5 is sealed with the organic glass cover plate through a sealing ring, and the titanium wire 11 extends out of the cathode chamber a from the upper side of the air electrode 5 and is connected with the external lead 22; the product collecting hopper 4 is arranged at the bottom of the cathode chamber A, the lower end of the product collecting hopper is connected with the sludge discharge pipe 3, and the middle part of the sludge discharge pipe 3 is provided with a closed flange 10 for fixing a water stop splint 17; the wastewater circulating system is connected with a cathode chamber water inlet 23 and a cathode chamber water outlet 24 to realize wastewater circulation, the cathode chamber water outlet 24 is connected with an anaerobic digestion liquid inlet 1-1, the anaerobic digestion liquid inlet 1-1 is connected with a circulating pump 1-4 through a water inlet pipe 1-2 and a 90-degree elbow 1-3, the circulating pump 1-4 is connected with a liquid storage tank 1-6 through a connecting pipe 1-5, and the liquid storage tank is connected with an anode chamber water inlet 23 through a water outlet pipe 1-7.
As shown in fig. 1-3, the magnesium electrode 8 is arranged on the left side of the inner cavity of the anode chamber B, the left side surface of the anode chamber B is connected with the organic glass cover plate through a sealing ring to realize sealing, the anode chamber water inlet 13 and the clamping groove 14 are arranged on the top of the anode chamber B, the other end of the titanium wire 11 connected with the external lead 22 penetrates through the wire hole 15 to be connected with the magnesium electrode 8, and the magnesium electrode 8 is placed into the anode chamber B from the clamping groove 14.
As shown in fig. 2 and fig. 3, the cation exchange membrane 16 is fixed in the hollow organic glass plate by a sealing ring 20, the cavity of the cathode chamber a is connected with the hollow organic glass plate in a sealing manner by the sealing ring 20, and the hollow organic glass plate is connected with the cathode chamber a in a sealing manner by the sealing ring 20. 4 connecting bolts 12 sequentially penetrate through the organic glass cover plate, the anode chamber B, the hollow organic glass plate, the cathode chamber A and the organic glass cover plate from left to right, are screwed and fixed at two ends of the connecting bolts 12 by using shell fixing screws 9, are connected into an integral structure and are placed on the support frame.
The sizes and proportions of the components can be set according to actual conditions. In this embodiment, the cathode chamber a and the anode chamber B have the same specification, the same volume, and the volume ratio of 1: 1. The cathode chamber A adopts anaerobic digestion wastewater with ammonia nitrogen concentration of 3420-8118mg/L and phosphate concentration of 95-9500mg/L, the distance from the water outlet 24 of the cathode chamber to the top is 1/4 of the total height of the cathode chamber A, the distance from the water inlet 23 of the cathode chamber to the bottom is 1/4 of the total height of the cathode chamber A, and the ratio of the inner diameters of the water outlet 24 of the cathode chamber and the water inlet 23 of the cathode chamber is 1: 1; the bottom of the cathode chamber A is provided with a product collecting hopper 4, the product collecting hopper 4 is of a chamfered platform structure, the inclination angle of the product collecting hopper 4 is 50-60 degrees, the lower end of the product collecting hopper is connected with a product discharge pipe 3, a water stop clamping plate 17 is fixed on the product discharge pipe 3, and the water stop clamping plate 17 is opened every 4-6 days to collect the denitrification and dephosphorization products. 0.01-0.1mol/L sodium chloride solution can be added into the anode chamber B to serve as electrolyte, the ratio of the inner diameters of a water inlet 13 of the anode chamber to a water inlet 23 of the cathode chamber is 1:1, the clamping groove 14 is square, the distance from the side face of the cathode chamber is 1/10 of the total length of the anode chamber, the width of the clamping groove 14 is 0.5mm, the magnesium electrode 8 is embedded in the clamping groove, a wire hole 15 is formed in the magnesium electrode 8, the distance from the wire hole 15 to the upper end of the magnesium electrode 8 is 1/10 of the total length of the magnesium electrode 8, and the ratio of the diameter of the wire hole 15 to the diameter of the titanium wire is 1: 1. The volumes of liquid in the anode chamber B and the cathode chamber A are the same, and the liquid volume accounts for 90% of the volume of each chamber. In the wastewater circulating system, the volume ratio of the liquid storage tanks 1-6 to the magnesium-air battery I is 4: 1. The magnesium electrode 8 is a rectangular magnesium sheet which is completely immersed in the electrolyte, and the ratio of the surface area to the volume of the anode chamber B is 1 cm2 :3.1cm3(ii) a The air electrode 5 is rectangular and thinA tablet, which is formed by pressing a carbon-based layer, a diffusion layer and a catalytic layer in combination, is completely immersed in anaerobically digested wastewater, and has a ratio of surface area to volume of a cathode chamber A of 1 cm2：2cm3(ii) a The cation exchange membrane 16 is a rectangular membrane completely immersed in the solution and has a ratio of surface area to volume of the cathode compartment A of 1 cm2：2cm3. Through tests, the dimensional proportion and the parameters can better fulfill the test aim of the utility model.
The device for treating anaerobic digestion wastewater and recovering nitrogen and phosphorus resources by using the magnesium-air battery can be made of organic glass, and the working process is as follows: anaerobic digestion wastewater enters the cathode chamber A from a liquid storage tank 1-6 in the wastewater circulating system through a water outlet pipe 1-7, and the continuous treatment of the wastewater is realized through a circulating pipe pump 1-4. Sodium chloride solution enters the anode chamber B from the water inlet 13 of the anode chamber to be used as anolyte; the magnesium electrode 8 in the anode chamber loses electrons to generate soluble divalent magnesium, and the magnesium ions pass through the cation exchange membrane 16 to enter anolyte and react with ammonium radicals and phosphate radical ions in catholyte to generate struvite (MgNH)4PO4·6H2O); struvite is precipitated into a product collecting hopper 4 and periodically discharged through a sludge discharge pipe 3. Electrons lost by the magnesium electrode 8 of the anode chamber are transmitted to the air electrode 5 of the cathode chamber A through the external lead 22 to be combined with oxygen in the air to generate OH-And a good pH condition is provided for the generation of struvite, and meanwhile, current is formed in an external circuit, and data acquisition is carried out by an electric signal collection system 6. The cation exchange membrane 16 separates the anode chamber from the cathode chamber, and the charge balance between the anode chamber and the cathode chamber is maintained by exchanging cations with the cation 16.
The utility model has the following characteristics: 1) the zero-valent magnesium has strong reducibility, so that the nitrogen and phosphorus removal rate of the wastewater is high, and the reaction period is short; 2) the anaerobic digestion wastewater can be efficiently treated, and nitrogen and phosphorus resources can be recovered in the form of struvite; 3) continuously operating to maintain the concentration of pollutants at a higher level, so that the nitrogen and phosphorus removal rate of the wastewater is maintained at a higher level; 4) without additional alkali, oxygen of the air cathode is used for generating OH by electrons-Providing a good pH condition for the generation of struvite; 5) the product is generated in the cathode chamberThe high-concentration sodium chloride solution in the anode chamber avoids the influence of the passivation of the magnesium electrode on the reaction efficiency; 6) the magnesium electrode is convenient to replace.
Claims (8)
1. The device for treating anaerobic digestion wastewater and recycling nitrogen and phosphorus resources by using the magnesium-air battery is characterized by comprising a cathode chamber (A), an anode chamber (B), a product collecting hopper (4) and a wastewater circulating system, wherein a communicated passage is arranged between the cathode chamber (A) and the anode chamber (B), and a cation exchange membrane (16) is arranged in the passage; an air cathode (5) is arranged in the inner cavity of the cathode chamber (A), a cathode chamber water inlet (23) and a cathode chamber water outlet (24) are formed in the cathode chamber (A), and the cathode chamber water inlet (23) and the cathode chamber water outlet (24) are connected with a wastewater circulating system; the product collecting hopper (4) is arranged at the bottom of the cathode chamber (A), and a sludge discharge port is formed in the bottom of the product collecting hopper (4); a magnesium electrode (8) is arranged in the anode chamber (B), and an anode chamber water inlet (13) is also arranged on the anode chamber (B); the electrolyte in the anode chamber (B) is a sodium chloride solution.
2. The magnesium-air battery as claimed in claim 1, wherein the cation exchange membrane (16) is disposed opposite to the air cathode (5) and the magnesium electrode (8), the cathode chamber water inlet (23) and the cathode chamber water outlet (24) are respectively disposed at both sides of the cation exchange membrane (16) and both sides of the air cathode (5), and the cathode chamber water inlet (23) is lower than the cathode chamber water outlet (24).
3. The magnesium-air battery device for treating anaerobic digestion wastewater and recovering nitrogen and phosphorus resources as claimed in claim 1, wherein the sludge discharge port at the bottom of the product collecting hopper (4) comprises a product discharge pipe (3), a sealing flange (10) is arranged on the product discharge pipe (3), and a water stop clamping plate (17) is arranged on the sealing flange (10).
4. The magnesium-air battery apparatus for treating anaerobic digestion wastewater and recovering nitrogen and phosphorus resources according to claim 1, wherein the wastewater circulating system comprises an anaerobic digestion solution inlet (1-1), a water inlet pipe (1-2), a circulating pump (1-4), a connecting pipe (1-5), a liquid storage tank (1-6), a water outlet pipe (1-7) and an anaerobic digestion solution outlet (1-8), the anaerobic digestion solution inlet (1-1) is connected with the cathode chamber water outlet (24), and the anaerobic digestion solution outlet (1-8) is connected with the cathode chamber water inlet (23); the anaerobic digestion liquid outlet (1-8) is connected with the liquid storage tank (1-6) through the water outlet pipe (1-7), the liquid level in the liquid storage tank (1-6) is higher than the level of the water inlet (23) of the cathode chamber, the water outlet of the circulating pump (1-4) is connected with the liquid storage tank (1-6) through the connecting pipe (1-5), and the water inlet of the circulating pump (1-4) is connected with the anaerobic digestion liquid inlet (1-1).
5. The magnesium-air battery device for treating anaerobic digestion wastewater and recycling nitrogen and phosphorus resources as claimed in claim 1, wherein the top of the anode chamber (B) is provided with a slot (14) for the magnesium electrode (8) to enter and exit.
6. The magnesium-air battery device for treating anaerobic digestion wastewater and recovering nitrogen and phosphorus resources according to claim 5, characterized in that titanium wires (11) are connected to the magnesium electrode (8) and the air cathode (5), the titanium wires (11) connected to the magnesium electrode (8) extend from the clamping groove (14) to the outside of the anode chamber (B), and the titanium wires (11) connected to the air cathode (5) extend to the outside of the cathode chamber (A).
7. The magnesium-air battery apparatus for treating anaerobic digestion wastewater and recovering nitrogen and phosphorus resources as claimed in claim 1, wherein the anode chamber water inlet (13) is located at the upper part of the anode chamber (B).
8. The apparatus for treating anaerobic digestion wastewater and recovering nitrogen and phosphorus resources with magnesium-air battery as claimed in claim 1, wherein each 3.1-4.2cm3The anode chamber (B) is correspondingly configured to be 1-1.3cm2The magnesium electrode (8); every 2-2.5cm3The cathode chamber (A) is correspondingly providedPlacing at 1-1.25cm22-2.5cm per each air cathode (5)3The cathode chamber (A) is correspondingly configured to be 1-1.25cm2The cation exchange membrane (16).
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| CN202220233532.XU CN216785795U (en) | 2022-01-27 | 2022-01-27 | Device for treating anaerobic digestion wastewater and recycling nitrogen and phosphorus resources by using magnesium-air battery |
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| CN202220233532.XU CN216785795U (en) | 2022-01-27 | 2022-01-27 | Device for treating anaerobic digestion wastewater and recycling nitrogen and phosphorus resources by using magnesium-air battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114291873A (en) * | 2022-01-27 | 2022-04-08 | 西安建筑科技大学 | Device and method for treating anaerobic digestion wastewater and recycling nitrogen and phosphorus resources by continuous operation of magnesium-air battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114291873A (en) * | 2022-01-27 | 2022-04-08 | 西安建筑科技大学 | Device and method for treating anaerobic digestion wastewater and recycling nitrogen and phosphorus resources by continuous operation of magnesium-air battery |
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