CN115676982B - Sewage denitrification device and method based on alternating current electrolysis - Google Patents
Sewage denitrification device and method based on alternating current electrolysis Download PDFInfo
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Abstract
The invention discloses a sewage denitrification device and method based on alternating current electrolysis, belonging to the technical field of sewage treatment; the device comprises an electrolytic tank, an electrolytic polar plate, an electrolytic filler layer, an alternating current variable frequency power supply and the like, wherein the alternating current variable frequency power supply is used as an electrolytic power supply, a ferroferric oxide and carbon material mixture is used as an electrolytic polar plate surface functional layer, iron-carbon micro-electrolysis materials are filled between the electrolytic polar plates, sewage to be denitrified is used as electrolyte to form a three-dimensional electrolytic system, after the electrolytic treatment, nitrate nitrogen and ammonia nitrogen in the sewage are converted into nitrogen and separated from the sewage, and the total nitrogen and ammonia nitrogen indexes in the sewage can be removed to meet the emission standard.
Description
Technical Field
The invention relates to a sewage denitrification device and a sewage denitrification method, in particular to a sewage denitrification device and a sewage denitrification method based on alternating current electrolysis, and belongs to the technical field of sewage treatment.
Background
The high total nitrogen and ammonia nitrogen wastewater has wide sources and large discharge amount, the total nitrogen and the ammonia nitrogen are nutrients in the water body, can cause the water eutrophication phenomenon, are main oxygen consumption pollutants in the water body, and have great harm to aquatic organisms and human beings. The problems of high process difficulty and high cost of reducing total nitrogen and ammonia nitrogen become difficult points and pain points in the sewage treatment industry.
The current method for treating the high-concentration total nitrogen and ammonia nitrogen wastewater comprises the following steps: chemical precipitation, stripping, ion exchange, break point chlorination, catalytic oxidation, biological and electrochemical methods, and the like. The chemical precipitation method has high treatment cost and is easy to cause secondary pollution; the stripping method is a commonly used physicochemical denitrification technology at present, but has the problems of frequent scaling of a stripping tower, low ammonia nitrogen removal rate at low temperature, secondary pollution of stripping gas and the like; the ion exchange method has high running cost; the break point chlorination method has high denitrification rate, but byproducts chloramine and chlorinated organic compounds easily cause secondary pollution; the catalytic oxidation method has high purification efficiency, but the catalyst is easy to run off, and the equipment is easy to corrode; the traditional biological method is only suitable for treating low-concentration ammonia nitrogen wastewater, and pretreatment is needed before high-concentration ammonia nitrogen wastewater is treated. In recent years, electrochemical methods have been receiving increasing attention in the field of wastewater treatment.
The electrochemical method has the advantages of small occupied area, simple and flexible operation, green cleaning and the like, and is attracting great attention. However, the existing electrochemical method has the problems of high energy consumption, high equipment manufacturing cost, short service life of the anode and the like. The invention of China patent application No. CN2021111097157 discloses an ion catalytic electrolytic denitrification system and a method thereof for sewage, wherein the system comprises an ion catalytic electrolytic denitrification device, and the ion catalytic electrolytic denitrification device consists of an electrolyzer, a direct current power supply, a degassing tank, a catalyst feeding device, an electrode cleaning device and a reduction device. The nitrogen-containing sewage enters an ion catalytic electrolytic denitrification device after solid particles (SS) are removed by a coagulating sedimentation treatment device, and ammonia nitrogen and total nitrogen in the sewage are removed. The invention has the advantages that ammonia nitrogen and total nitrogen in sewage are removed together through ion catalytic electrolysis, the invention is not only suitable for denitrification of municipal domestic sewage, but also particularly suitable for denitrification of sewage with high ammonia nitrogen such as landfill leachate (also called leachate), cultivation wastewater, coal chemical wastewater and the like, reduces the ammonia nitrogen concentration of sewage, improves the biodegradability of sewage, is convenient for biochemical treatment of water with high ammonia nitrogen such as landfill leachate, cultivation wastewater, coal chemical wastewater and the like, reduces ammonia nitrogen in wastewater into nitrogen by an ion-catalyzed anode in the same electrolyzer, and synchronously oxidizes nascent state nitrogen generated by electrolysis into nitrogen by cathode. However, each electrode group needs to be provided with at least one cathode and at least one anode, the cathode and the anode are separated to denitrify ammonia nitrogen and nitrate nitrogen respectively, and the power supply adopts a direct current power supply or a pulse direct current power supply, so that the efficiency is low, the energy consumption is high, the anode material is expensive, the service life is short and the like.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to solve the technical problems of complex treatment process, large consumption of chemical agents, high cost, secondary pollution and the like in the existing sewage denitrification treatment technology, upgrade the existing electrochemical sewage denitrification treatment technology through an alternating current electrolysis technology and a novel electrolysis plate technology, and solve the problems of high energy consumption, high equipment manufacturing cost, short anode service life, need of adjusting ph and salinity of a water body to be treated and the like in the existing electrochemical sewage denitrification treatment technology.
(II) technical scheme
In order to solve the technical problems, the invention provides a sewage denitrification device based on alternating current electrolysis, which comprises an electrolytic tank, electrolytic polar plates, an electrolytic packing layer and an alternating current variable frequency power supply, wherein at least two electrolytic polar plates are arranged in the electrolytic tank, gaps are arranged between the electrolytic polar plates, electrolytic materials are filled in the gaps between the electrolytic polar plates to form the electrolytic packing layer, and the leftmost electrolytic polar plates and the rightmost electrolytic polar plates in the electrolytic tank are respectively electrically connected with the alternating current variable frequency power supply; the surface of the electrolytic polar plate is sprayed with a functional layer, and the raw material components of the functional layer comprise ferroferric oxide and carbon materials.
Further, the number of the electrolytic polar plates is six, the electrolytic polar plates are uniformly arranged in an array manner in the electrolytic tank, the power supply voltage is required to be reduced or increased correspondingly less than or more than six electrolytic polar plates, the power supply voltage required by the structure of the six electrolytic polar plates is most conveniently obtained, the interval between the adjacent electrolytic polar plates is 15mm-25mm, preferably 20mm, and the energy consumption and the efficiency are both considered.
Further, the electrolytic material is one or a combination of more than one of iron-carbon micro-electrolytic material, activated carbon, ferroferric oxide, iron particles, carbon fiber, graphene and carbon nano tube, preferably the iron-carbon micro-electrolytic material, and particularly 20 x 40 iron-carbon spheres.
Further, the carbon material is one or a combination of more of graphite powder, activated carbon powder, carbon fiber, graphene and carbon nano tube.
Further, the raw material components of the functional layer also comprise reduced iron powder and 1% PVA (polyvinyl alcohol) aqueous solution.
Further, the electrode material of the electrolytic electrode plate is one of an active carbon fiber electrode, a carbon fiber cloth electrode, a graphite electrode, a platinum iridium alloy electrode, a carbon steel electrode, a stainless steel electrode, an aluminum electrode, a lead dioxide electrode, a carbon nano tube electrode and a graphene electrode. Preferably the electrolyte plates are 160 x 60 x 1mm q235 carbon steel. The surface of the Q235 carbon steel is sprayed with a functional layer, the functional layer coating is formed by mixing 10% of nano ferroferric oxide and 90% of 5% of graphene water-based coating, and the dry film thickness of the coating is 60 microns. Or Q235 carbon steel, the surface of which is pressed (sprayed) with a functional layer, the coating of the functional layer is formed by mixing 30% of nano ferroferric oxide, 5% of graphene, 10% of activated carbon powder, 30% of reduced iron powder and the balance of 1% of PVA aqueous solution, the thickness of the functional layer is 120 micrometers, and the functional layer is formed by firing at 500-650 ℃.
Further, the device also comprises a magnetic stirrer, wherein the magnetic stirrer is arranged at the bottom of the electrolytic tank, and the magnetic stirrer is used for stirring electrolyte (sewage to be denitrified).
The invention also provides a sewage denitrification method based on alternating current electrolysis, which adopts the sewage denitrification device and comprises the following steps:
s1, introducing sewage to be denitrified into an electrolytic tank to serve as electrolyte, using an alternating-current variable-frequency power supply as an electrolytic power supply, using a mixture of ferroferric oxide and carbon materials as a functional layer for an electrolytic polar plate, and filling electrolytic materials between the electrolytic polar plates to form a three-dimensional electrolytic system;
s2, the electrolytic polar plate is continuously converted into an anode and a cathode under the action of an alternating current variable frequency power supply, a large number of bipolar electrodes are formed on the surface and inside of the electrolytic material under the action of an externally-applied alternating current electric field, and the anode and the cathode are continuously converted;
s3, controlling current density, power frequency and waveform through an alternating-current variable-frequency power supply to carry out electrolytic denitrification treatment on sewage to be denitrified;
s4, when the electrolytic polar plate is used as an anode, ammonia nitrogen is oxidized into nitrogen and water at the polar plate for removal; when the electrolytic plate is changed from the anode to the cathode, nitrate nitrogen is reduced to nitrite and nitrogen by electrons on the surface of the electrolytic plate, and nitrite is reduced to nitrogen by electrons on the surface of the electrolytic plate for removal.
Wherein the current density in the step S3 is 1-100mA/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The frequency of the alternating current variable frequency power supply is 0.1-10000Hz, and the waveform comprises sine waves, square waves or triangular waves.
1. The mechanism of degrading ammonia nitrogen by the AC electrolysis method is as follows:
1) Electrolytic process of electrolytic polar plateH is generated in (1) 2 0 2 And the surface of the polar plate is converted into OH (hydroxyl radical) with extremely strong oxidizing property, and the OH (hydroxyl radical) oxidizes ammonia nitrogen into nitrogen and water
2) The ammonia nitrogen is directly oxidized into nitrogen and water when the electrolytic polar plate is in an anode state;
NH 3 +3OH - -3e - —0.5N 2 +3H 2 O
3) When chloride ions exist in the sewage, hypochlorite generated by electrolysis of the electrolytic polar plate can be oxidized to remove ammonia nitrogen.
2. When the nitrate nitrogen is in the cathode state, nitrate nitrogen is reduced to nitrite and nitrogen by electrons on the surface of the electrode plate, and nitrite is reduced to nitrogen by electrons on the surface of the electrode plate for removal.
NO 3 - +3H 2 O+5e - —0.5N 2 +6OH -
NO 3 - +H 2 O+2e - —NO 2 - +2OH -
NO 2 - +2H 2 O+3e - —0.5N 2 +4OH -
(III) beneficial effects
The technical scheme of the invention has the following advantages:
1. the invention creatively adopts the alternating current variable frequency power supply as the electrolysis power supply, reduces the polarization and the ion mass transfer distance to be treated in the process of always and rapidly exchanging the cathode and anode states of the electrolysis polar plate, greatly improves the efficiency, reduces the energy consumption, reduces the cost of electrode materials and prolongs the service life of the electrode materials.
2. Due to the use of the frequency conversion technology, the advantages of different frequencies on the treatment process are different, and the frequency can be flexibly adjusted according to different indexes of sewage to be treated so as to achieve the optimal treatment effect, namely, the treated sewage has strong index fluctuation resistance, and the treated sewage has a large index range.
3. The invention creatively applies the mixture of the ferroferric oxide and the carbon material as the surface functional layer of the electrolytic sewage denitrification electrolytic polar plate, and the carbon treatment mainly comprises graphite powder, activated carbon powder, carbon fiber, graphene, carbon nano tube and the like, and the mixture of the ferroferric oxide and the carbon material has high electrochemical oxidation and reduction activities; and the application of the ferroferric oxide and carbon material mixture as the surface functional layer of the electrolytic sewage denitrification electrolytic polar plate is not found at present.
4. The existing iron-carbon micro-electrolysis material is commonly used for strengthening and improving treatment effects by means of compressed air, adjusting sewage salinity, microwaves, ultrasonic waves and the like in the application of sewage treatment. The invention takes an alternating current variable frequency power supply as an electrolysis power supply, a mixture of ferroferric oxide and carbon materials is taken as a functional layer on the surface of an electrolysis board, iron-carbon micro-electrolysis materials are filled between the electrolysis boards, sewage to be denitrified is taken as electrolyte to form a three-dimensional electrolysis system, after the electrolysis treatment, nitrate nitrogen and ammonia nitrogen in the sewage are converted into nitrogen and separated from the sewage, and the indexes of total nitrogen and ammonia nitrogen in the sewage can be removed to meet the emission standard. The existing electrochemical sewage denitrification treatment technology is upgraded by an alternating current electrolysis technology and a novel electrolysis plate technology, and the problems of high energy consumption, high equipment manufacturing cost, short service life of an anode, need of adjusting ph and salinity of the water body to be treated and the like in the existing electrochemical sewage denitrification treatment are solved.
5. The three-dimensional electrolytic sewage denitrification system is formed by creatively filling the space between the electrolytic plates with the iron-carbon micro-electrolysis material and taking the sewage to be denitrified as electrolyte, and the three-dimensional electrolytic sewage denitrification system adopts an alternating current electrolysis mode, so that the conductive electrolytic filler can be fixed relative to the electrolytic polar plate without stirring the compressed air, the problems of hardening and performance degradation of the filler after long-term use can be avoided, and the structure of the three-dimensional electrolytic sewage denitrification system is greatly simplified. Also, because of the alternating current electrolysis mode, the electrolysis efficiency and the service life of the iron-carbon micro-electrolysis material are greatly improved. No method and device for strengthening an external alternating current electric field are reported in the prior art.
In addition to the technical problems, features of the constituent technical solutions and advantages brought by the technical features of the technical solutions described above, other technical features of the present invention and advantages brought by the technical features of the technical solutions will be further described with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the structure of the device of the present invention.
In the figure: 1-electrolytic tank, 2-electrolytic polar plate, 3-electrolytic filler layer, 4-AC variable frequency power supply and 5-magnetic stirrer.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1: the sewage denitrification device based on alternating current electrolysis comprises an electrolytic tank 1, electrolytic polar plates 2, an electrolytic filler layer 3 and an alternating current variable frequency power supply 4, wherein at least two electrolytic polar plates 2 are arranged in the electrolytic tank 1, gaps are reserved between the electrolytic polar plates 2, electrolytic materials are filled in the gaps between the electrolytic polar plates 2 to form the electrolytic filler layer 3, and the leftmost electrolytic polar plates 2 and the rightmost electrolytic polar plates 2 in the electrolytic tank 1 are respectively electrically connected with the alternating current variable frequency power supply 4; the surface of the electrolytic polar plate 2 is sprayed with a functional layer, and the raw material components of the functional layer comprise ferroferric oxide and carbon materials. Specifically, six electrolytic pole plates 2 are arranged and are uniformly arranged in an array in the electrolytic tank 1, and the intervals between adjacent electrolytic pole plates 2 are 15mm-25mm.
The electrolytic material is one or the combination of more of iron-carbon micro-electrolytic material, active carbon, ferroferric oxide, iron particles, carbon fiber, graphene and carbon nano tube. The carbon material is one or the combination of more of graphite powder, activated carbon powder, carbon fiber, graphene and carbon nano tube. The raw material components of the functional layer also comprise reduced iron powder and 1% PVA aqueous solution. The electrode material of the electrolytic pole plate 2 is one of an active carbon fiber electrode, a carbon fiber cloth electrode, a graphite electrode, a platinum iridium alloy electrode, a carbon steel electrode, a stainless steel electrode, an aluminum electrode, a lead dioxide electrode, a carbon nano tube electrode and a graphene electrode.
The device also comprises a magnetic stirrer 5, wherein the magnetic stirrer 5 is arranged at the bottom of the electrolytic tank 1.
A sewage denitrification method based on alternating current electrolysis adopts the sewage denitrification device and realizes sewage denitrification through the following steps:
s1, introducing sewage to be denitrified into an electrolytic tank 1 to serve as electrolyte, using an alternating-current variable-frequency power supply 4 as an electrolytic power supply, using a mixture of ferroferric oxide and carbon materials as a functional layer for an electrolytic polar plate 2, and filling electrolytic materials between the electrolytic polar plates 2 to form a three-dimensional electrolytic system;
s2, the electrolytic polar plate 2 is subjected to anode and cathode conversion continuously under the action of the alternating current variable frequency power supply 4, a large number of bipolar electrodes are formed on the surface and inside of the electrolytic material under the action of an externally-applied alternating current electric field, and the anode and the cathode are converted continuously;
s3, controlling current density, power frequency and waveform through an alternating current variable frequency power supply 4 to carry out electrolytic denitrification treatment on sewage to be denitrified;
s4, when the electrolytic polar plate 2 is used as an anode, ammonia nitrogen is oxidized into nitrogen and water in the electrolytic polar plate 2 to be removed; when the electrolytic plate 2 is changed from the anode to the cathode, nitrate nitrogen is reduced to nitrogen gas on the surface of the electrolytic plate 2 for removal.
The current density in the step S3 is 1-100mA/cm < 2 >; the frequency of the alternating current variable frequency power supply 4 is 0.1-10000Hz, and the waveform comprises sine waves, square waves or triangular waves.
Example 1
The electrode distance of each electrolytic polar plate is set to be 20mm, the volume of the effective electrolytic tank is 2L, 2 electrolytic polar plates shown in figure 1 are connected with an alternating current variable frequency power supply, and the other 4 electrolytic polar plates are used as bipolar electrolytic polar plates. When the three-dimensional electrode is electrolyzed, an iron-carbon micro-electrolysis material (the iron-carbon balls with the specification of 20 x 40) is filled between electrolysis polar plates, and a magnetic stirrer is used for stirring electrolyte. The electrolytic polar plate is 160-60-1 mm Q235 carbon steel, the surface of the electrolytic polar plate is sprayed with a functional layer, the functional layer coating is formed by mixing 10% of nano ferroferric oxide and 90% of 5% of graphene water-based coating, and the thickness of a coating dry film is 60 microns.
Electrolyte components (simulating sewage to be denitrified) are prepared: total Nitrogen (TN) 50, ammonia nitrogen (NH 3-N) 25, was prepared from tap water. 1.2L of prepared electrolyte is added into the electrolytic tank in FIG. 1, the electrolytic voltage is 21V, the current is 1.3A, the electrolytic frequency is 528Hz, the electrolytic time is 5min, and the sampling analysis is carried out: total Nitrogen (TN) 38, ammonia nitrogen (NH 3-N) 19;
sample analysis for 15min electrolysis time: total Nitrogen (TN) 13, ammonia nitrogen (NH 3-N) 2;
example 2
The electrode distance of each electrolytic polar plate is set to be 20mm, the volume of the effective electrolytic tank is 2L, 2 polar plates shown in figure 1 are connected with an alternating current variable frequency power supply, and the rest 4 electrolytic polar plates are used as bipolar electrolytic polar plates. When the three-dimensional electrode system is used for electrolysis, an iron-carbon micro-electrolysis material (20 x 40 iron-carbon balls) is filled between electrolysis polar plates, and a magnetic stirrer is used for stirring electrolyte.
The electrolytic polar plate is 160-60-1 mm Q235 carbon steel, the surface of the electrolytic polar plate is pressed (sprayed) with a functional layer, the functional layer coating is formed by mixing 30% of nano ferroferric oxide, 5% of graphene, 10% of activated carbon powder, 30% of reduced iron powder and the balance of 1% of PVA aqueous solution, the thickness is 120 microns, and the electrolytic polar plate is prepared by firing at 500-650 ℃.
Preparing electrolyte components: total Nitrogen (TN) 50, ammonia nitrogen (NH 3-N) 25, was prepared from tap water.
1.2L of prepared electrolyte is added into the device shown in FIG. 1, the electrolysis voltage is 14V, the current is 1.3A, and the electrolysis frequency is 1000Hz;
sample analysis for 5min electrolysis time: total Nitrogen (TN) 32, ammonia nitrogen (NH 3-N) 16
Sample analysis for 10min electrolysis time: total Nitrogen (TN) 12, ammonia nitrogen (NH 3-N) 2
While the present invention has been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (4)
1. A sewage denitrification device based on alternating current electrolysis is characterized in that: the electrolytic cell comprises an electrolytic cell (1), electrolytic pole plates (2), an electrolytic packing layer (3) and an alternating current variable frequency power supply (4), wherein at least two electrolytic pole plates (2) are arranged in the electrolytic cell (1), gaps are reserved between the electrolytic pole plates (2), electrolytic materials are filled in the gaps between the electrolytic pole plates (2) to form the electrolytic packing layer (3), and the leftmost electrolytic pole plates (2) and the rightmost electrolytic pole plates (2) in the electrolytic cell (1) are respectively electrically connected with the alternating current variable frequency power supply (4); the surface of the electrolytic polar plate (2) is sprayed with a functional layer, and raw material components of the functional layer comprise ferroferric oxide and carbon materials;
six electrolytic polar plates (2) are arranged and are uniformly arranged in an array in the electrolytic tank (1), and the interval between adjacent electrolytic polar plates (2) is 15mm-25mm;
the electrolytic material is one or the combination of more of iron-carbon micro-electrolytic material, active carbon, ferroferric oxide, iron particles, carbon fiber, graphene and carbon nano tube;
the carbon material is one or a combination of more of graphite powder, activated carbon powder, carbon fiber, graphene and carbon nano tube;
the raw material components of the functional layer also comprise reduced iron powder and 1% PVA aqueous solution;
the electrode material of the electrolytic pole plate (2) is one of an active carbon fiber electrode, a carbon fiber cloth electrode, a graphite electrode, a platinum iridium alloy electrode, a carbon steel electrode, a stainless steel electrode, an aluminum electrode, a lead dioxide electrode, a carbon nano tube electrode and a graphene electrode;
the electrolytic plate is 160-60-1 mm Q235 carbon steel, a functional layer is sprayed on the surface of the Q235 carbon steel, the functional layer coating is formed by mixing 30% of nano ferroferric oxide, 5% of graphene, 10% of activated carbon powder, 30% of reduced iron powder and the balance of 1% of PVA aqueous solution, the thickness is 120 microns, and the electrolytic plate is prepared by firing at 500-650 ℃.
2. The ac electrolysis-based sewage denitrification device according to claim 1, wherein: the electrolysis bath also comprises a magnetic stirrer (5), wherein the magnetic stirrer (5) is arranged at the bottom of the electrolysis bath (1).
3. A sewage denitrification method based on alternating current electrolysis is characterized in that: a sewage denitrification apparatus according to any one of claims 1 to 2, comprising the steps of:
s1, introducing sewage to be denitrified into an electrolytic tank (1) to serve as electrolyte, using an alternating current variable frequency power supply (4) as an electrolytic power supply, using a mixture of ferroferric oxide and carbon materials as a functional layer for an electrolytic polar plate (2), and filling electrolytic materials between the electrolytic polar plates (2) to form a three-dimensional electrolytic system;
s2, the electrolytic polar plate (2) is subjected to anode and cathode conversion under the action of an alternating current variable frequency power supply (4), a large number of bipolar electrodes are formed on the surface and inside of the electrolytic material under the action of an externally-applied alternating current electric field, and the anode and the cathode are subjected to anode and cathode conversion continuously;
s3, controlling current density, power frequency and waveform through an alternating current variable frequency power supply (4) to carry out electrolytic denitrification treatment on sewage to be denitrified;
s4, when the electrolytic polar plate (2) is used as an anode, ammonia nitrogen is oxidized into nitrogen and water in the electrolytic polar plate (2) to be removed; when the electrolytic polar plate (2) is changed from the anode to the cathode, nitrate nitrogen is reduced to nitrogen on the surface of the electrolytic polar plate (2) for removal.
4. A sewage denitrification method based on alternating current electrolysis according to claim 3, wherein: the current density in the step S3 is 1-100mA/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The frequency of the alternating current variable frequency power supply (4) is 0.1-10000Hz, and the waveform comprises sine waves, square waves or triangular waves.
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