Sulfur autotrophic denitrification total nitrogen removal sewage treatment bioreactor

Abstract

The invention discloses a sulfur autotrophic denitrification total nitrogen removal sewage treatment bioreactor which comprises a reaction cavity and an electrolysis device, the electrolysis device comprises cathode plates and anode plates which are arranged in the reaction cavity in the circumferential direction at intervals, and the cathode plates and the anode plates are controlled by a rotating device to rotate in the circumferential direction. According to the invention, sulfur autotrophic denitrification and electrolytic hydrogen autotrophic denitrification are combined, and the cathode plate and the anode plate can rotate in the reactor, so that hydrogen is released more uniformly, the problem that the concentration of hydrogen in a local area is too high or too low is reduced, and the utilization rate of microorganisms is improved. Hydrogen is prevented from staying in a local area, and the mass transfer efficiency is improved. And the rotating electrode can enable the current density to be uniformly distributed, reduce local excessive reaction and improve the electrolysis efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly to a biological reactor for sulfur autotrophic denitrification to remove total nitrogen from sewage treatment. Background Art

[0002] The sulfur autotrophic denitrification total nitrogen removal technology is a technology for removing nitrogen in sewage by using autotrophic bacteria to reduce nitrate (NO3 - ) and nitrite (NO2 - ) through elemental sulfur or sulfide. The advantage of this method is that it can use elemental sulfur or sulfide (such as bisulfate or hydrogen sulfide) as an electron donor for denitrification without relying on an external organic carbon source, thereby effectively removing total nitrogen (T-N) in water.

[0003] Combining electrolytic hydrogen autotrophic denitrification with sulfur autotrophic denitrification can be complementary, improve the denitrification efficiency, and optimize the utilization of the electron donor. Electrolytic hydrogen autotrophic denitrification requires an electrolysis device to be arranged in the biological reactor, and the design of the electrodes of the electrolysis device is a key factor, which directly affects the hydrogen production efficiency and the effect of the denitrification process.

[0004] Currently, fixed cathode and anode electrodes are arranged in the cavity of the reactor to achieve electrolytic hydrogen autotrophic denitrification of sewage. The position-fixed electrodes mean that the positions of the electrodes in the reactor remain unchanged during the whole reaction process.

[0005] However, the fixed electrode positions may lead to uneven electric field distribution, low electrolysis efficiency, and low hydrogen autotrophic denitrification efficiency; it may also lead to uneven current density distribution on the electrode surface, resulting in local overreaction or fouling of the electrode, leading to corrosion, and thus affecting the service life of the electrode. For different water qualities and reaction conditions, the fixed-position electrodes cannot be adjusted as needed, resulting in low reaction efficiency or inadaptability. Summary of the Invention

[0006] To solve at least one of the above technical problems existing in the fixed-position electrodes, the present invention proposes a biological reactor for sulfur autotrophic denitrification to remove total nitrogen from sewage treatment, which has electrodes with adjustable positions, so as to obtain better electrolysis technical effects.

[0007] The technical solution adopted by the present invention is to design a biological reactor for sulfur autotrophic denitrification to remove total nitrogen from sewage treatment, including a reaction chamber and an electrolysis device. The electrolysis device includes a cathode plate and an anode plate arranged at circumferential intervals in the reaction chamber, and the cathode plate and the anode plate are controlled by a rotating device to rotate circumferentially.

[0008] In some embodiments, the reaction chamber includes a sulfur autotrophic section located below and a hydrogen autotrophic section located above the sulfur autotrophic section, and the electrolysis device is arranged in the cavity of the hydrogen autotrophic section.

[0009] In some embodiments, the rotating device includes gears arranged at the upper ends of the cathode plate and the anode plate, an outer gear ring and an inner gear ring meshing with the gears, and the outer gear ring and the inner gear ring are respectively controlled to rotate by independent motors.

[0010] In some embodiments, a conductive ring electrically connected to the cathode plate or the anode plate is sleeved on the rotating shaft of the gear. A cathode conductive ring electrically connected to the cathode plate is sleeved on the rotating shaft of the gear connected to the cathode plate, and an anode conductive ring electrically connected to the anode plate is sleeved on the rotating shaft of the gear connected to the anode plate. All the cathode conductive rings are simultaneously slidably and electrically connected to a cathode power supply slip ring, and all the anode conductive rings are simultaneously slidably and electrically connected to an anode power supply slip ring.

[0011] In some embodiments, the radial dimension of the cathode conductive ring is greater than or less than that of the anode conductive ring.

[0012] In some embodiments, the cathode conductive ring and the anode conductive ring are respectively located on both sides of the rotating shaft in the radial direction.

[0013] In some embodiments, an anode rod is arranged in the middle of the reaction chamber.

[0014] In some embodiments, a cathode layer is arranged on the inner wall of the reaction chamber.

[0015] In some embodiments, fluidized bed biological fillers are arranged in the reaction chamber.

[0016] In some embodiments, activated carbon particles are arranged in the reaction chamber.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention combines sulfur autotrophic denitrification with electrolytic hydrogen autotrophic denitrification, and enables the cathode plate and the anode plate to rotate within the reactor, making the release of hydrogen more uniform, reducing the problem of excessive or insufficient hydrogen concentration in local areas, and improving the utilization rate of microorganisms. It avoids the retention of hydrogen in local areas and improves the mass transfer efficiency. The rotating electrode can evenly distribute the current density, reduce local over-reaction, and improve the electrolysis efficiency. By adjusting the rotation speed or angle of the electrode, the electric field distribution can be dynamically optimized to make the electrolysis process more uniform and stable. It can also avoid uneven growth of microorganisms. If the hydrogen distribution is uneven, it may lead to vigorous growth of microorganisms in some areas, while the denitrification effect in other areas is affected due to insufficient hydrogen. The rotating electrode can reduce the local polarization phenomenon on the electrode surface, delay electrode corrosion and passivation, and improve the service life of the electrode. The rotating electrode can drive the water body to flow, enhance the mixing effect within the reactor, avoid local dead zones, make the denitrification process of the entire reactor more uniform, and improve the denitrification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be described in detail below in conjunction with specific embodiments and drawings. For the purpose of showing details and facilitating the understanding of its principle, it is not necessarily drawn to scale, and similar reference numerals may describe similar components in different views. The drawings generally illustrate the embodiments discussed herein by way of example and not limitation. Among them:

[0020] Figure 1 is a top view schematic diagram of the reactor in the embodiment.

[0021] Figure 2 is Figure 1 the schematic cross-sectional view of A-A of

[0022] Figure 3 is Figure 1 the enlarged schematic diagram at B in

[0023] Figure 4 is Figure 1 the enlarged schematic diagram at C in

[0024] Figure 5 is Figure 1 the schematic diagram when the electrode surface of

[0025] Figure 6 is Figure 2 the enlarged schematic diagram at D in

[0026] Figure 7 is Figure 2 the enlarged schematic diagram at E in

[0027] In the figure, 1 is the cathode plate; 2 is the anode plate; 3 is the sulfur autotrophic section; 31 is the supernatant layer; 32 is the filter media layer; 33 is the support layer; 34 is the water distribution layer; 35 is the filter plate; 4 is the hydrogen autotrophic section; 5 is the liquid supply pipe; 6 is the orifice plate; 7 is the gear; 8 is the external gear ring; 9 is the internal gear ring; 10 is the motor; 11 is the driving gear; 12 is the cathode conductive ring; 13 is the anode conductive ring; 14 is the cathode power supply slip ring; 15 is the anode power supply slip ring; 16 is the anode rod; 17 is the cathode layer; 18 is the activated carbon particles; 19 is the rotating shaft. Detailed implementation manners

[0028] The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments, and the following implementation manners do not limit the invention involved in the claims. In addition, all combinations of the features described in the implementation manners are not necessarily required for the solution of the invention.

[0029] The principle and structure of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] Embodiment

[0031] As Figure 1 、 2 shown, a biological reactor for sulfur autotrophic denitrification of sewage treatment for total nitrogen removal includes a reaction chamber and an electrolysis device. The electrolysis device includes a cathode plate 1 and an anode plate 2 circumferentially and spaced apart inside the reaction chamber. The cathode plate 1 and the anode plate 2 are controlled by a rotating device to rotate circumferentially. In this embodiment, the cathode plate 1 and the anode plate 2 are respectively four. Of course, the specific quantity, material and size can be determined according to the actual working conditions and so on. These are well-known to those skilled in the art and will not be elaborated here.

[0032] The reaction chamber of this embodiment is cylindrical. Of course, it is not limited to this, and it can also be rectangular or other shapes. Specifically, it can be adaptively set according to actual needs and will not be listed one by one here.

[0033] During electrolysis, the cathode plate 1 and the anode plate 2 can rotate within the reactor, thereby constantly changing their positions. The electrodes are arranged at circumferential intervals and can rotate, making the release of hydrogen more uniform, reducing the problem of excessive or insufficient hydrogen concentration in local areas, and improving the utilization rate of microorganisms. The rotating electrodes can disrupt the bubble aggregation during electrolytic hydrogen production by the electrodes, making it easier for hydrogen to diffuse throughout the reactor, avoiding the retention of hydrogen in local areas, and improving the mass transfer efficiency. The rotating electrodes can make the current density evenly distributed, reduce local over-reaction, and improve the electrolysis efficiency. By adjusting the rotation speed or angle of the electrodes, the electric field distribution can be dynamically optimized to make the electrolysis process more uniform and stable. It can also prevent uneven growth of microorganisms. If the hydrogen distribution is uneven, it may cause vigorous growth of microorganisms in some areas, while the denitrification effect in other areas is affected due to insufficient hydrogen. It makes the microorganisms evenly distributed and improves the denitrification efficiency. The rotating electrodes can increase the solubility of hydrogen in water, making it easier for denitrifying bacteria to obtain electron donors and increasing the denitrification rate. Fixed electrodes are prone to microbial adhesion and sludge accumulation due to long-term operation, affecting the electrolysis efficiency. However, the rotatable electrodes can reduce the accumulation of biofilms or sediments and lower the frequency of cleaning and maintenance. The rotating electrodes can reduce the local polarization phenomenon on the electrode surface, delay electrode corrosion and passivation, increase the service life of the electrodes, and reduce the operating cost. The rotating electrodes can drive the water body to flow, enhance the mixing effect within the reactor, avoid local dead zones, make the denitrification process of the entire reactor more uniform, and improve the denitrification effect. The rotating electrodes can adjust the rotation speed and direction according to the change of the influent water quality, optimize the hydrogen supply, and meet the sewage treatment requirements under different loads. For the tail gases such as oxygen and hydrogen discharged during electrolysis, they can be treated by setting up gas collection equipment, which is a conventional technology in this field and will not be elaborated here.

[0034] Specifically, such as Figure 3 、 4As shown in the figure, the reactor can adopt a segmented reaction process, that is, the reaction chamber includes a sulfur autotrophic section 3 located below and a hydrogen autotrophic section 4 located above the sulfur autotrophic section 3. The reactor is divided into two upper and lower reaction chambers, with the upper being the hydrogen autotrophic chamber and the lower being the sulfur autotrophic chamber. The bottom of the sulfur autotrophic chamber is connected to a liquid supply pipe 5 for pumping sewage into the chamber. The two reaction chambers are separated by an orifice plate 6, so that the liquid that has undergone sulfur autotrophic reaction in the sulfur autotrophic chamber passes upward through the orifice plate 6 and enters the upper hydrogen autotrophic chamber for electrolytic hydrogen autotrophic nitrogen removal and purification. The purified water overflows from the upper port of the hydrogen autotrophic chamber to the outside, thus realizing the purification treatment of sewage. The sulfur autotrophic chamber includes a supernatant layer 31, a filter material layer 32, a support layer 33, and a water distribution layer 34 from top to bottom. The filter material layer contains sulfur matrix, and the support layer is made of materials such as pebbles. The water that has undergone sulfur autotrophic reaction enters the clear water layer upward and then enters the upper hydrogen autotrophic chamber through the orifice plate 6. The liquid supply pipe 5 is connected to the water distribution layer 34. A filter plate 35 is provided between the support layer 33 and the water distribution layer 34. The filter plate is evenly distributed with filter heads. The sewage entering the water distribution layer 34 is evenly introduced upward into the chamber above the filter plate through the filter heads.

[0035] The rotating device in this embodiment includes gears 7 provided at the upper ends of the cathode plate 1 and the anode plate 2, an outer gear ring 8 and an inner gear ring 9 meshing with the gear 7. The outer gear ring 8 and the inner gear ring 9 are respectively controlled to rotate by independent motors 10. Both the outer gear ring 8 and the inner gear ring 9 have inner and outer ring teeth. The gear 7 meshes with the inner ring teeth of the outer gear ring 8 and the outer ring teeth of the inner gear ring 9 at the same time. The outer ring teeth of the outer gear ring 8 and the inner ring teeth of the inner gear ring 9 respectively mesh with two driving gears 11. The two driving gears 11 are respectively driven to rotate by two motors 10.

[0036] When the rotation directions of the outer gear ring 8 and the inner gear ring 9 are the same, it can drive the electrodes to rotate circumferentially, thereby changing the positions of the electrodes and the agitation of the water; when the rotation directions of the outer gear ring 8 and the inner gear ring 9 are opposite, it can cause each electrode to rotate around the axis of the gear 7, thereby realizing the agitation of the water body and changing the orientation of the electrodes.

[0037] A conductive ring electrically connected to the cathode plate 1 or the anode plate 2 is sleeved on the rotating shaft 19 of the gear 7. That is, a cathode conductive ring 12 electrically connected to the cathode plate 1 is sleeved on the rotating shaft 19 of the gear 7 connected to the cathode plate 1, and an anode conductive ring 13 electrically connected to the anode plate 2 is sleeved on the rotating shaft 19 of the gear 7 connected to the anode plate 2. All the cathode conductive rings 12 are simultaneously slidably electrically connected to a cathode power supply slip ring 14, and all the anode conductive rings 13 are simultaneously slidably electrically connected to an anode power supply slip ring 15. The power supply slip ring is used to connect to an external power supply. Through the sliding electrical contact between the conductive ring and the power supply slip ring, the electrodes can be electrically connected to the outside even when they are rotating, thus ensuring continuous power supply to the electrodes.

[0038] As Figure 6 , 7 shown, in the radial direction, the cathode conductive ring 12 and the anode conductive ring 13 are respectively located on both sides of the rotating shaft 19. The cathode conductive ring 12 and the anode conductive ring 13 are arranged one above the other along the axial direction of the rotating shaft 19. The radial dimension of the cathode conductive ring 12 is greater than or less than that of the anode conductive ring 13. In this embodiment, the radial dimension of the cathode conductive ring 12 is less than that of the anode conductive ring 13. Thus, the cathode conductive ring 12 can only contact the cathode power supply slip ring 14 and cannot contact the anode power supply slip ring 15, and the anode conductive ring 13 can only contact the anode power supply slip ring 15 and cannot contact the cathode power supply slip ring 14.

[0039] Furthermore, an anode rod 16 can be arranged in the middle of the reaction chamber, so that when the electrode plate surface rotates to be perpendicular to the radial direction of the reaction chamber, an electrode pair is formed between the anode rod 16 and the cathode plate 1, and an electric current is formed in the radial direction of the reaction chamber. At this time, the anode plate 2 can be powered off.

[0040] Furthermore, a cathode layer 17 is arranged on the inner wall of the reaction chamber, that is, a layer of cathode material is arranged on the inner wall of the upper reaction chamber as the electrolytic cathode. Thus, an electrode pair can be formed between the cathode layer 17 and the anode plate 2, and an electric current is formed in the radial direction of the reaction chamber.

[0041] Furthermore, fluidized bed biological fillers can be arranged in the reaction chamber. For example, activated carbon particles 18 can be arranged in the reaction chamber. Thus, the distributed electrode plates and the activated carbon particles 18 are equivalent to forming a three-dimensional electrolysis device. Three-dimensional electrolysis water treatment is an advanced technology for removing pollutants in water by using the electrolysis process. Different from the traditional electrolysis water treatment method, three-dimensional electrolysis water treatment usually forms a multi-dimensional electric field or current distribution by arranging special electrode structures or fillers in the electrolytic cell, thereby enhancing the water treatment effect. The rotating electrode plates cause the activated carbon particles 18 to fluidize in the reaction chamber, which is beneficial to the reaction purification of the biofilm.

[0042] The anode of the electrolysis device in this embodiment can be graphite, and the cathode can be a metal plate, but of course it is not limited thereto.

[0043] The specific embodiments described herein are only illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A biological reactor for sulfur autotrophic denitrification total nitrogen removal sewage treatment, comprising a reaction chamber and an electrolysis device, characterized in that, The electrolysis device includes a cathode plate and an anode plate that are circumferentially spaced apart inside the reaction chamber, and the cathode plate and the anode plate are controlled by a rotating device to rotate circumferentially.

2. The autotrophic sulfur denitrification total nitrogen removal sewage treatment bioreactor according to claim 1, characterized in that, The reaction chamber includes a sulfur autotrophic section located below and a hydrogen autotrophic section located above the sulfur autotrophic section, and the electrolysis device is arranged inside the cavity of the hydrogen autotrophic section.

3. The autotrophic sulfur denitrification total nitrogen removal sewage treatment bioreactor according to claim 1, characterized in that, The rotating device includes gears arranged at the upper ends of the cathode plate and the anode plate, an outer gear ring and an inner gear ring that mesh with the gears, and the outer gear ring and the inner gear ring are respectively controlled to rotate by independent motors.

4. The autotrophic sulfur denitrification total nitrogen removal sewage treatment bioreactor according to claim 3, characterized in that, A conductive ring electrically connected to the cathode plate or the anode plate is sleeved on the rotating shaft of the gear. A cathode conductive ring electrically connected to the cathode plate is sleeved on the rotating shaft of the gear connected to the cathode plate, and an anode conductive ring electrically connected to the anode plate is sleeved on the rotating shaft of the gear connected to the anode plate. All the cathode conductive rings are simultaneously slidably and electrically connected to a cathode power supply slip ring, and all the anode conductive rings are simultaneously slidably and electrically connected to an anode power supply slip ring.

5. The autotrophic sulfur denitrification total nitrogen removal sewage treatment bioreactor according to claim 4, wherein The radial dimension of the cathode conductive ring is greater than or less than that of the anode conductive ring.

6. The autotrophic sulfur denitrification total nitrogen removal sewage treatment bioreactor according to claim 5, characterized in that Radially, the cathode conductive ring and the anode conductive ring are respectively located on both sides of the rotating shaft.

7. The biological reactor for sulfur autotrophic denitrification total nitrogen removal sewage treatment according to claim 1, wherein An anode rod is arranged in the middle of the reaction chamber.

8. The biological reactor for sulfur autotrophic denitrification total nitrogen removal sewage treatment according to claim 1, characterized in that, A cathode layer is arranged on the inner wall of the reaction chamber.

9. The biological reactor for sulfur autotrophic denitrification of total nitrogen removal in sewage treatment according to claim 1, wherein Fluidized bed biological fillers are arranged inside the reaction chamber.

10. The biological reactor for sulfur autotrophic denitrification for total nitrogen removal from sewage treatment according to claim 1, characterized in that, Activated carbon particles are arranged inside the reaction chamber.

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