Electrolytic catalytic biological denitrification reactor

Abstract

The application discloses an electrolytic catalytic biological denitrification reactor and relates to the technical field of sewage treatment. The electrolytic catalytic biological denitrification reactor comprises a reactor body, an external power supply connected to the reactor body, an anaerobic reaction chamber and an aerobic reaction chamber separated by a first partition wall in the inner cavity of the reactor body, and a first drainage hole formed in the first partition wall. A water inlet is formed in the outer side wall of the anaerobic reaction chamber. A unit cathode and a water flow propeller are fixed in the anaerobic reaction chamber. A water outlet is formed in the outer side wall of the aerobic reaction chamber. A unit anode and a water flow propeller are fixed in the aerobic reaction chamber. The unit anode and the unit cathode are connected in parallel through wires, and the wires are connected to the external power supply. The electrolytic catalytic biological denitrification reactor can effectively improve the biological denitrification efficiency, reduce the pollution to the environment, has strong adaptability to water quality changes, has good sludge settling performance, is easy to maintain, manage and operate, has high denitrification efficiency, and has small land occupation.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically to an electrolytic catalytic biological denitrification reactor. Background Technology

[0002] The large-scale discharge of industrial wastewater and urban sewage has led to severe pollution of water sources. Water sources with excessive nitrate nitrogen levels are often accompanied by excessive concentrations of trace organic matter, making water purification even more difficult and causing lasting negative impacts on human health and industrial and agricultural production. Pollutants discharged during daily life and production processes are increasingly polluting source water, with the degree of pollution becoming more severe and the amount of organic matter in the water gradually increasing. Simultaneously, with the gradual improvement of water quality analysis technology, the types of trace pollutants that can be detected in water sources and drinking water are constantly increasing, presenting new challenges in drinking water purification. In response to these new pollution problems in source water, researchers have begun to study new water purification technologies, and many of these technologies have already been applied in practical production.

[0003] Currently, the main technologies for treating slightly polluted water sources include physical, chemical, and biological methods. Physical and chemical methods include adsorption, coagulation-sedimentation, and membrane separation. Adsorption can only transfer micro-pollutants without decomposing or eliminating them. Coagulation-sedimentation involves adding coagulants to aggregate colloids and fine suspended solids into flocs, followed by sedimentation for solid-liquid separation, often introducing secondary pollution. Membrane separation suffers from high cost, high energy consumption, and poor selectivity. Biological methods utilize the metabolic activity of microorganisms to convert organic pollutants and acids / alkalis / salts in water into inorganic CO2, H2O, and N2, achieving purification. However, due to factors such as low concentrations of organic matter and acids / alkalis / salts in some raw water sources and the unpredictable environment of microorganisms, single biological treatment technologies are often inefficient and ineffective. Furthermore, the presence of recalcitrant organic matter in the water can inhibit microbial activity, making the biological treatment process difficult to operate effectively.

[0004] Therefore, how to provide an electrolytic catalytic biological denitrification reactor that combines electrochemical electron transfer with biological oxidation-reduction to compensate for the shortcomings of chemical and biological methods alone in treating slightly polluted water sources is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides an electrolytic catalytic biological denitrification reactor that combines chemical and biological methods to treat slightly polluted water sources.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An electrolytic catalytic biological denitrification reactor includes a reactor body and an external power source connected thereto. The inner cavity of the reactor body is divided into an anaerobic reaction chamber and an aerobic reaction chamber by a first partition wall. A first drainage hole is provided in the first partition wall. A water flow propeller is fixed in both the anaerobic reaction chamber and the aerobic reaction chamber.

[0008] An inlet is provided on the outer wall of the anaerobic reaction chamber; a unit cathode is fixed inside the anaerobic reaction chamber;

[0009] An outlet is provided on the outer wall of the aerobic reaction chamber; a unit anode is fixed inside the aerobic reaction chamber; the unit anode and the unit cathode are connected in parallel by a wire, and the wire is electrically connected to the external power supply.

[0010] Through the above technical solutions, the electrolytic catalytic biological denitrification reactor provided by the present invention, by placing electrochemical cathode plates and anode plates in a traditional anoxic-aerobic biodegradation reactor, can effectively improve the efficiency of biological denitrification, reduce environmental pollution, have strong adaptability to water quality changes, have good sludge settling performance, are easy to maintain, manage and operate, have high denitrification efficiency and small footprint.

[0011] Preferably, in the above-mentioned electrolytic catalytic biological denitrification reactor, the inlet is staggered from the first drainage hole, and the first drainage hole is staggered from the outlet. The wastewater to be treated flows in an S-shaped path within the anaerobic and aerobic reaction chambers, enabling effective oxidation-reduction reactions on the electrode plates and adapting to changes in water quality.

[0012] Preferably, in the above-mentioned electrolytic catalytic biological denitrification reactor, an aeration device is fixedly connected to the bottom of the aerobic reaction chamber. This forces external oxygen into the aerobic reaction chamber, ensuring sufficient dissolved oxygen is obtained within it.

[0013] Preferably, in the above-mentioned electrolytic catalytic biological denitrification reactor, the unit cathode is composed of graphite material, and the number of unit cathodes is not less than two. The reduction reaction on the cathode can promote the denitrification reaction, causing more nitrates and nitrites to be converted into N2, N2O, and NO for discharge.

[0014] Preferably, in the above-mentioned electrolytic catalytic biological denitrification reactor, the unit anode is composed of multiple metal pieces with catalytic function, and the number of unit anodes is not less than two. The oxidation at the anode can promote the nitrification reaction. The electrolysis reaction at the anode electrolyzes the organic matter in the wastewater to be treated, producing dissolved CO2. At the same time, O2 is generated by electrolyzing water at the anode, which can increase the dissolved oxygen concentration in the aerobic tank.

[0015] Preferably, in the above-mentioned electrolytic catalytic biological denitrification reactor, the inner cavity of the aerobic reaction chamber is divided into a first aerobic reaction chamber and a second aerobic reaction chamber by a second partition wall. The first aerobic reaction chamber is connected to the anaerobic reaction chamber through the first drainage hole. A second drainage hole is provided in the second partition wall, and an outlet is provided on the outer side wall of the second aerobic reaction chamber. Multiple aerobic reaction chambers can thoroughly oxidize slightly polluted water sources and fully electrolyze organic matter in wastewater.

[0016] Preferably, in the above-mentioned electrolytic catalytic biological denitrification reactor, the inlet is staggered from the first drainage hole, the first drainage hole is staggered from the second drainage hole, and the second drainage hole is staggered from the outlet. This allows the wastewater to flow in an S-shaped path within the reactor, ensuring a thorough oxidation-reduction reaction within the reaction chamber.

[0017] Preferably, in the above-mentioned electrolytic catalytic biological denitrification reactor, an adjustable resistor is fixedly connected to the external power supply. The current density at the anode and cathode in the reactor can be adjusted as needed. Under the same pH conditions, a suitable current density can not only improve the activity and denitrification performance of denitrifying bacteria, but also effectively enhance the pH resistance of denitrifying bacteria when the pH range exceeds the optimal range.

[0018] Preferably, in the above-mentioned electrolytic catalytic biological denitrification reactor, the unit cathode undergoes a reduction reaction, converting more nitrates and nitrites into N2, N2O, and NO for discharge.

[0019] Preferably, in the aforementioned electrolytic catalytic biological denitrification reactor, the unit anode undergoes an oxidation reaction. This promotes nitrification, and the generated CO2 provides an inorganic carbon source for nitrifying and denitrifying bacteria in the reaction zone; simultaneously, it increases the dissolved oxygen concentration in the aerobic reaction chamber. Microorganisms can fully utilize the oxygen, hydrogen, and electron donors generated by electrochemistry to maintain their growth and the progress of nitrification and denitrification denitrification reactions, degrading pollutants through both biological and electrochemical processes.

[0020] As can be seen from the above technical solution, compared with the prior art, the present invention discloses an electrolytic catalytic biological denitrification reactor, which has the following beneficial effects:

[0021] 1. The unit cathode enriches anaerobic microorganisms on the electrode surface for growth, increasing the concentration of sludge in the anaerobic reaction chamber; the unit anode's oxidation function further degrades the reduced organic pollutants, further reducing their toxicity and improving their biodegradability.

[0022] 2. Electrochemical-assisted technology has advantages such as easy maintenance, low cost, simple equipment, and no secondary pollution. The degradation of organic pollutants can protect the ecological environment in a reasonable and effective way. It can deeply convert nitrogenous organic matter into biological low-toxicity degradation products, enhance the efficiency and rate of biological treatment of azo organic wastewater, and combine chemical and biological methods to deeply treat slightly polluted water sources.

[0023] 3. The unit cathode and unit anode are combined and placed in the anoxic reaction chamber and the aerobic reaction chamber. The size of the unit cathode and unit anode can be reasonably customized according to the conditions of the anoxic and aerobic zones in the existing equipment for modification. At the same time, the unit cathode and unit anode can be flexibly replaced according to actual use, making maintenance more convenient and quick. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 The attached figure is a top view of the internal structure of the electrolytic catalytic biological denitrification reactor provided by the present invention;

[0026] Figure 2 The attached figure is a schematic diagram of the external power supply for the electrode plate provided by the present invention.

[0027] in:

[0028] 1-Reactor body; 2-Anaerobic reaction chamber; 31-First aerobic reaction chamber; 32-Second aerobic reaction chamber; 4-Unit cathode; 5-Unit anode; 6-Inlet; 7-Outlet; 9-External power supply; 10-Adjustable resistor; 11-Water flow propeller; 12-First drainage hole; 13-Aeration device; 14-Second drainage hole; 15-First partition wall; 16-Second partition wall. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] See appendix Figures 1-2This invention discloses an electrolytic catalytic biological denitrification reactor, including a reactor body 1 and an external power supply 9 connected thereto. The inner cavity of the reactor body 1 is divided into an anaerobic reaction chamber 2 and an aerobic reaction chamber 3 by a first partition wall 15. A first drainage hole 12 is provided on the first partition wall 15. A water flow propeller 11 is fixed in both the anaerobic reaction chamber 2 and the aerobic reaction chamber 3.

[0031] An inlet 6 is provided on the outer wall of the anaerobic reaction chamber 2; a unit cathode 4 is fixed inside the anaerobic reaction chamber 2;

[0032] An outlet 7 is provided on the outer wall of the aerobic reaction chamber 3; a unit anode 5 is fixed inside the aerobic reaction chamber 3; the unit anode 5 and the unit cathode 4 are connected in parallel by a wire, which is connected to an external power supply 9.

[0033] In this embodiment, the inner cavity of the aerobic reaction chamber 3 is divided into a first aerobic reaction chamber 31 and a second aerobic reaction chamber 32 by a second partition wall 16. The first aerobic reaction chamber 31 is connected to the anaerobic reaction chamber 2 through a first drainage hole 12. A second drainage hole 14 is provided on the second partition wall 16, and a water outlet 7 is provided on the outer wall of the second aerobic reaction chamber 32.

[0034] In this embodiment, the inlet 6 is staggered with the first drainage hole 12, the first drainage hole 12 is staggered with the second drainage hole 14, and the second drainage hole 14 is staggered with the outlet 7.

[0035] In this embodiment, there are two unit cathodes 4 and four unit anodes 5.

[0036] To further optimize the above technical solution, an aeration device is fixedly connected to the bottom of the aerobic reaction chamber 3.

[0037] To further optimize the above technical solution, the unit anode 5 is composed of catalytic metal, whose oxidation effect can promote the nitrification reaction. In addition, the electrolysis reaction electrolyzes the organic matter in the raw water to produce dissolved CO2; at the same time, the generation of O2 through water electrolysis can increase the dissolved oxygen concentration in the aerobic reaction chamber.

[0038] To further optimize the above technical solution, an adjustable resistor 10 is fixedly connected to the external power supply 9.

[0039] In this embodiment, the specific structure of the electrolytic catalytic biological denitrification reactor is shown in the attached figure. Figure 1 As shown, the diagram is arranged according to the planar orientation (up, down, left, right):

[0040] The reactor body 1 is provided with an anaerobic reaction chamber 2, a first partition wall 15, a first aerobic reaction chamber 31, a second partition wall 16, and a second aerobic reaction chamber 32 from left to right.

[0041] The inlet 6 is located at the upper left of the anaerobic reaction chamber 2, the first drainage hole 12 is located at the lower right of the anaerobic reaction chamber 2 (lower left of the first aerobic reaction chamber 31), the second drainage hole 14 is located at the upper left of the second aerobic reaction chamber 32 (upper right of the first aerobic reaction chamber 31), the outlet is located at the lower right of the second aerobic reaction chamber 32, and a water flow propeller 11 is installed between the unit cathode 4 and the unit anode 5.

[0042] The wastewater to be treated enters the anaerobic reaction chamber 2 through the inlet 6. After the reduction reaction of the unit cathode 4, the water flow propeller 11 propels the water into the aerobic reaction chamber 3. After the oxidation reaction of the unit anode 5 in the aerobic reaction chamber 3, the water flow propeller 11 in the first aerobic reaction chamber 31 propels the water into the second aerobic reaction chamber 32. The water flow in the second aerobic reaction chamber 32 is then propelled by the water flow propeller 11 towards the outlet 7, completing one treatment cycle.

[0043] The connection of the unit cathode and unit anode is as follows: Figure 2 As shown, the unit cathode 4 and the unit anode 5 are connected in parallel and connected to an external power supply 9. An adjustable resistor 10 is connected to the external power supply 9, which can adjust the current density of the unit cathode and unit anode plates in the reactor.

[0044] The electrolytic catalytic biological denitrification reactor provided by this invention combines chemical and biological methods in traditional micro-polluting water treatment technologies, deeply converting nitrogenous organic matter into low-toxicity biological degradation products. The degradation of organic pollutants can protect the ecological environment in a reasonable and effective way.

[0045] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electrolytic catalytic biological denitrification reactor, comprising a reactor body (1) and an external power source (9), characterized in that, The inner cavity of the reactor body (1) is divided into an anaerobic reaction chamber (2) and an aerobic reaction chamber (3) by a first partition wall (15). A first drainage hole (12) is provided on the first partition wall (15). A water flow propeller (11) is fixed in both the anaerobic reaction chamber (2) and the aerobic reaction chamber (3). An inlet (6) is provided on the outer wall of the anaerobic reaction chamber (2); a unit cathode (4) is fixed inside the anaerobic reaction chamber (2). An outlet (7) is provided on the outer wall of the aerobic reaction chamber (3); a unit anode (5) is fixed inside the aerobic reaction chamber (3); the unit anode (5) and the unit cathode (4) are connected in parallel by a wire, and the wire is electrically connected to an external power supply (9); an adjustable resistor (10) is electrically connected to the external power supply (9). The number of unit anodes (5) is not less than two; the unit anodes (5) are composed of metals with catalytic function and carry out oxidation reaction; their oxidation reaction can promote the nitrification reaction, and the electrolysis reaction electrolyzes the organic matter in the raw water to produce dissolved CO2; at the same time, O2 is generated by electrolyzing water to increase the dissolved oxygen concentration in the aerobic reaction chamber. The number of unit cathodes (4) is not less than two; the unit cathodes (4) are composed of graphite material, and the unit cathodes (4) undergo a reduction reaction to convert more nitrates and nitrites into N2, N2O and NO for discharge.

2. The electrolytic catalytic biological denitrification reactor according to claim 1, characterized in that, The inlet (6) is offset from the first drain hole (12), and the first drain hole (12) is offset from the outlet (7).

3. The electrolytic catalytic biological denitrification reactor according to claim 1, characterized in that, An aeration device (13) is fixedly connected to the bottom of the aerobic reaction chamber (3).

4. The electrolytic catalytic biological denitrification reactor according to claim 1, characterized in that, The inner cavity of the aerobic reaction chamber (3) is divided into a first aerobic reaction chamber (31) and a second aerobic reaction chamber (32) by a second partition wall (16). The first aerobic reaction chamber (31) is connected to the anaerobic reaction chamber (2) through the first drainage hole (12). A second drainage hole (14) is provided on the second partition wall (16). An outlet (7) is provided on the outer wall of the second aerobic reaction chamber (32).

5. The electrolytic catalytic biological denitrification reactor according to claim 4, characterized in that, The inlet (6) is misaligned with the first drain hole (12), the first drain hole (12) is misaligned with the second drain hole (14), and the second drain hole (14) is misaligned with the outlet (7).

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