Mud-water reverse-flow anaerobic ammonia oxidation reactor and denitrification method thereof

Abstract

The invention relates to the technical field of anaerobic ammonia oxidation reactors, and discloses a muddy water reverse flow type anaerobic ammonia oxidation reactor and a denitrification method thereof.The anaerobic ammonia oxidation reactor comprises a reactor body, the interior of the reactor body is divided into a water distribution and gas collection area, a denitrification reaction area and a flow guide and water collection area, and a muddy water separation area is further arranged above the reactor body; rising units are arranged in the denitrification reaction area and the flow guide and water collection area, and each rising unit comprises a rising pipe arranged in the reactor main body; a three-phase separation unit is arranged in the mud-water separation area and comprises a cyclone separator arranged on the reactor main body. Through uniform water distribution of the water distribution holes, a mud-water countercurrent effect and the gas-solid separation device, the short flow phenomenon generated after sludge floats and gathers is effectively avoided, so that wastewater and granular sludge are fully mixed and contacted, solid-liquid mass transfer is enhanced, and the nitrogen removal efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of anaerobic ammonia oxidation reactor, more particularly, it relates to a sludge and water countercurrent type anaerobic ammonia oxidation reactor and a denitrification method thereof. BACKGROUND

[0002] Anaerobic ammonia oxidation has become a research hotspot in wastewater treatment today due to its characteristics of low energy consumption, no need to add organic carbon source, low sludge yield and high denitrification efficiency. Anaerobic ammonia oxidation bacteria grow slowly and are sensitive to environmental factors. Flocculent sludge is easily washed out of the system, resulting in a decrease in denitrification performance. Granular sludge, as the core of anaerobic ammonia oxidation denitrification process, has attracted much attention due to its excellent settling performance, high biological retention capacity and stable treatment efficiency. It solves the problems of traditional flocculent sludge, such as difficult separation of wastewater, high loss rate and weak resistance to impact load.

[0003] With the in-depth research and application of anaerobic ammonia oxidation, sludge floating and aggregation phenomenon occurs in both laboratory research and engineering application, which leads to short flow phenomenon in the reactor and seriously affects the denitrification performance of wastewater. Most of the existing denitrification reactors adopt upflow design, for example, Chinese patent application numbers: CN202410902815.2 and CN202410665263.8. The existing reactors are prone to cause sludge floating and aggregation during operation. These floating and aggregated sludge often flows out with the effluent, not only causing waste of microbial resources, but also reducing the denitrification effect of the reactor. Therefore, it is of great significance and practical value to develop a reactor that can avoid sludge floating and aggregation and achieve sludge retention for the application and promotion of anaerobic ammonia oxidation wastewater treatment process. SUMMARY

[0004] The present application provides a sludge and water countercurrent type anaerobic ammonia oxidation reactor and a denitrification method thereof, which solves the technical problem that the reactor is prone to cause sludge floating and aggregation during operation in the related art. These floating and aggregated sludge often flows out with the effluent, not only causing waste of microbial resources, but also reducing the denitrification effect of the reactor.

[0005] The present application discloses a sludge and water countercurrent type anaerobic ammonia oxidation reactor in the first aspect, including a reactor main body, the inner part of the reactor main body is divided into a water distribution and gas collection zone, a denitrification reaction zone and a flow guide and water collection zone, and a sludge and water separation zone is further arranged above the reactor main body.

[0006] The water distribution and gas collection zone is provided with a water distribution unit, the water distribution unit includes a water inlet pipe mounted on the reactor main body and a water distribution plate arranged in the reactor main body, a plurality of water distribution holes are uniformly distributed on the water distribution plate, and a gas-solid separation device and a gas collection chamber are further arranged on the water distribution plate, and an exhaust pipe is mounted on the gas collection chamber.

[0007] The denitrification reaction zone and the flow guide water collecting zone are provided with an ascending unit, the ascending unit comprises an ascending pipe arranged in the reactor body and a flow guide plate arranged in the reactor body, the flow guide plate is located in the flow guide water collecting zone, and a water collecting cover is arranged on one end of the ascending pipe close to the flow guide plate;

[0008] The sludge-water separation zone is provided with a three-phase separation unit, the three-phase separation unit comprises a cyclone separator arranged on the reactor body, the cyclone separator is provided with a gas outlet pipe, a water outlet pipe, a capacity pump and a sludge discharge pipe, the capacity pump is provided with an input end and an output end, the input end of the capacity pump is connected with the sludge discharge pipe, and the output end of the capacity pump is connected with the inside of the connector body.

[0009] As a further optimization scheme of the present application, the height-diameter ratio of the denitrification reaction zone is 3-8, and the water flow velocity in the denitrification reaction zone is 3-6 m / s.

[0010] As a further optimization scheme of the present application, the water distribution disc is in the shape of a round cake, the diameter of the water distribution hole is 6-12 mm, and the water flow velocity is 2-5 m / s.

[0011] As a further optimization scheme of the present application, the angle of the gas-solid separation device is 60°, the gas-solid separation device comprises a long plate and a short plate, the angle between the long plate and the short plate and the vertical direction is 30°, and the length ratio of the long plate to the short plate is 1.2-1.5.

[0012] As a further optimization scheme of the present application, the transverse length from the end of the short plate in the gas-solid separation device to the long plate in the adjacent gas-solid separation device is 40-80 mm.

[0013] As a further optimization scheme of the present application, the water flow ascending velocity in the ascending pipe is 5-12 m / s.

[0014] As a further optimization scheme of the present application, an auxiliary denitrification unit is further included, the auxiliary denitrification unit comprises a filter plate slidably connected to the ascending pipe, and a plurality of holes are arranged on the filter plate.

[0015] As a further optimization scheme of the present application, a sliding sleeve is arranged on the filter plate, a breechblock is arranged on the end of the sliding sleeve away from the filter plate, the sliding sleeve and the breechblock are slidably connected to the outside of the ascending pipe, a plurality of rod sleeves are arranged on the breechblock, a plurality of dispersion leaves are arranged on the rod sleeves, a connecting sleeve is arranged between the rod sleeves, a first connecting frame is arranged on the side of the rod sleeve away from the breechblock, and the end of the first connecting frame away from the rod sleeve is arranged on the inner wall of the reactor body.

[0016] As a further optimization scheme of the present application, a rack column is further installed on the sliding sleeve, and a plurality of gears are annularly distributed on the rack column, the rack column is in meshing connection with the gears, a rotating shaft is installed on the gears, a swing arm is installed on the rotating shaft, a plurality of dispersion rods are installed on the swing arm, a second connecting frame is bearing-connected to the rotating shaft, and one end of the second connecting frame away from the rack column is installed on the inner wall of the reactor main body.

[0017] The second aspect of the present application discloses a denitrification method of a sludge-water countercurrent type anaerobic ammonia oxidation reactor, comprising the following steps:

[0018] S1. The nitrogen-containing wastewater to be treated enters the water distribution and gas collection zone through the water inlet pipe, and then flows into the lower denitrification reaction zone through the uniformly distributed water distribution holes on the water distribution plate;

[0019] S2. In the denitrification reaction zone, the wastewater undergoes denitrification reaction under the action of sludge microorganisms, and the nitrogen gas generated in the reaction is partly gathered in the granular sludge, causing the granular sludge to float up; the other part of the escaped nitrogen gas pushes other granular sludge upwards;

[0020] S3. The floated granular sludge hits the gas-solid separation device, and the gas in the sludge escapes, at the same time, the wastewater flowing downward through the water distribution holes and the gap between the gas-solid separation device hits the floated granular sludge, forming a sludge-water countercurrent effect, promoting the gas in the sludge to escape, and the escaped gas enters the gas collection chamber together, and then enters the cyclone separator for three-phase separation through the exhaust pipe;

[0021] S4. The water flow in the reactor main body continues to flow downward to the bottom of the water guide and collection zone, is collected by the water guide plate and the water collection cover, and then flows into the middle riser pipe, the water flow in the riser pipe and the exhaust pipe enters the cyclone separator for three-phase separation at a certain flow rate, the gas is discharged from the top exhaust pipe of the cyclone separator, the water is discharged from the side water outlet pipe, and the sludge is discharged from the bottom, and is pumped back to the denitrification reaction zone by the capacity pump through the sludge discharge pipe;

[0022] S5. When the reactor main body is running, the sludge-water countercurrent effect is used to reduce the sludge floating, avoid the short flow phenomenon caused by the floating and gathering of the sludge, promote the granulation of the sludge, strengthen the sludge retention, and improve the sludge concentration and the denitrification effect.

[0023] The present application has the following advantages:

[0024] 1. The present application uniformly distributes the water through the water distribution holes, uses the sludge-water countercurrent effect and the gas-solid separation device, effectively avoids the short flow phenomenon caused by the floating and gathering of the sludge, makes the wastewater and the granular sludge fully mixed and contacted, strengthens the solid-liquid mass transfer, and improves the denitrification removal efficiency.

[0025] 2、The present application realizes sludge interception and backflow by cyclone separation device and capacity pump respectively, ensures sufficient sludge amount in the reactor, strengthens sludge retention, improves sludge concentration and guarantees the stability of the reactor operation.

[0026] 3、The reactor in the present application can form standardized, serialized and complete reaction device according to the water amount, and has good popularization value. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is the overall structure schematic diagram of the present application;

[0028] Figure 2 is the water distribution plate structure schematic diagram of the present application;

[0029] Figure 3 is the water distribution plate local three-dimensional structure schematic diagram of the present application;

[0030] Figure 4 is the water distribution plate three-dimensional structure schematic diagram of the present application;

[0031] Figure 5 is the internal structure three-dimensional schematic diagram of the present application;

[0032] Figure 6 is the auxiliary denitrification unit three-dimensional structure schematic diagram in the present application;

[0033] Figure 7 is the auxiliary denitrification unit local three-dimensional structure schematic diagram in the present application.

[0034] In the drawing: I, water distribution and gas collection area; II, denitrification reaction area; III, flow guide water collection area; IV, sludge-water separation area;

[0035] 1, reactor main body; 2, water inlet pipe; 3, water distribution plate; 4, water distribution hole; 5, gas-solid separation device; 6, exhaust pipe; 7, riser; 8, access hole; 9, sludge feeding pipe; 10, sampling port; 11, flow guide plate; 12, water collection cover; 13, emptying pipe; 14, cyclone separator; 15, gas outlet pipe; 16, water outlet pipe; 17, capacity pump; 18, sludge discharge pipe; 19, gas collection chamber; 20, filter plate; 21, sliding sleeve; 22, return lever; 23, rod sleeve; 24, dispersion leaf; 25, connecting sleeve; 26, first connecting frame; 27, rack column; 28, gear; 29, rotating shaft; 30, swing arm; 31, dispersion rod; 32, second connecting frame. DETAILED DESCRIPTION

[0036] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that the implementations discussed are merely for illustration and that the functionality and arrangement of the elements discussed can be changed without departing from the scope of the content of this specification. Various processes or components can be omitted, substituted, or added according to particular needs. In addition, features described with respect to some examples can be combined in other examples.

[0037] Embodiment One: According to the drawings Figure 1 As shown in the drawings, a sludge-water countercurrent anaerobic ammonia oxidation reactor comprises a reactor body 1, which is cylindrical; the inside of the reactor body 1 is divided into a water distribution and gas collection zone I, a denitrification reaction zone II, and a flow guide and water collection zone III, and the upper part of the reactor body 1 is further provided with a sludge-water separation zone IV.

[0038] According to the drawings Figure 1 to the drawings Figure 4 As shown in the drawings, the water distribution and gas collection zone I is provided with a water distribution unit, which comprises a water inlet pipe 2 mounted on the reactor body 1 and a water distribution plate 3 arranged in the reactor body 1; the water distribution plate 3 is uniformly provided with a plurality of water distribution holes 4, and is further provided with a gas-solid separation device 5 and a gas collection chamber 19, and the gas collection chamber 19 is mounted with an exhaust pipe 6, the end of which away from the gas collection chamber 19 extends through the reactor body 1 to the outer surface of the reactor body 1.

[0039] Specifically, the water distribution plate 3 is in the shape of a round cake, the water distribution holes 4 have a diameter of 6mm-12mm and a water flow exit hole speed of 2m / s-5m / s, and are arranged directly above the midpoint between adjacent gas-solid separation devices 5. In this embodiment, the arrangement of the water distribution holes 4 ensures that the wastewater is evenly distributed at an appropriate flow rate before entering the denitrification reaction zone II, thereby creating good conditions for subsequent denitrification reactions. In addition, the water distribution holes 4 are arranged directly above the midpoint between adjacent gas-solid separation devices 5, which helps to further optimize the distribution of the water flow and make the wastewater more evenly enter the denitrification reaction zone II.

[0040] Further, the gas-solid separation device 5 has an angle of 60°, the long plate and the short plate are both at an angle of 30° to the vertical direction, and the length ratio of the long plate to the short plate is 1.2-1.5; the horizontal length from the end of the short plate in the gas-solid separation device 5 to the long plate in the adjacent gas-solid separation device 5 is 40mm-80mm. In this embodiment, the reactor body 1 can effectively guide the floating granular sludge to collide and promote the gas inside the sludge to escape during operation, and at the same time, in combination with the impact of the water flow, achieve the sludge-water countercurrent effect and further improve the separation efficiency of the gas from the sludge.

[0041] According to the drawings Figure 1As shown, the denitrification reaction zone II and the flow guide water collection zone III are provided with an ascending unit, which includes an ascending pipe 7 arranged inside the reactor body 1, and the water flow ascending speed in the ascending pipe 7 is 5-12 m / s. The ascending unit further includes a flow guide plate 11 installed inside the reactor body 1, and the angle between the flow guide plate 11 and the bottom horizontal direction is 30°-50°. The angle is beneficial to guide the water flow to smoothly enter the ascending pipe 7 and improve the water flow collection efficiency. The flow guide plate 11 is located in the flow guide water collection zone III, and the end of the ascending pipe 7 close to the flow guide plate 11 is provided with a water collection cover 12, and the reactor body 1 is further provided with a emptying pipe 13, which is in communication with the inside of the reactor body 1. When the reactor needs to be maintained, cleaned or appears a special situation, the inside sludge and water can be discharged to ensure the normal operation of the reactor.

[0042] Specifically, the reactor body 1 is further provided with an access opening 8, a sludge feeding pipe 9 and a sampling port 10, and the access opening 8, the sludge feeding pipe 9 and the sampling port 10 are all located in the denitrification reaction zone II. In the embodiment, the access opening 8 provides a convenient access channel for the technicians when the reactor appears a fault or needs to be regularly maintained, and facilitates the inspection and maintenance of the internal equipment. The sludge feeding pipe 9 is used to supplement the appropriate granular sludge in time to maintain the efficient operation of the reactor when the internal sludge concentration is reduced due to various reasons and affects the denitrification effect during the operation of the reactor.

[0043] The sampling port 10 is provided with a plurality of sampling ports 10, and the setting height of each sampling port 10 is different. In the embodiment, by setting the sampling port 10 at different heights, the technicians can regularly collect water samples and sludge samples at different positions, comprehensively observe the changes of the sludge properties and the water quality, and timely adjust the operation parameters of the reactor to ensure that the reactor is always in the best operating state.

[0044] It should be noted that the height ratio of the water distribution and gas collection zone I, the denitrification reaction zone II and the flow guide water collection zone III is 1:(4-8):1. The height-diameter ratio of the denitrification reaction zone II is 3-8, and the water flow speed of the denitrification reaction zone II is 3 m / s-6 m / s.

[0045] According to the attached Figure 1As shown, the sludge-water separation zone IV is provided with a three-phase separation unit, which comprises a cyclone separator 14 arranged on the reactor main body 1; the cyclone separator 14 is provided with a gas outlet pipe 15, a water outlet pipe 16, a sludge discharge pipe 18 and a capacity pump 17, the capacity pump 17 is provided with an input end and an output end, the input end of the capacity pump 17 is connected with the sludge discharge pipe 18, and the output end of the capacity pump 17 is connected with the inside of the connector main body in communication. Among them, the capacity pump 17 can pump the sludge separated by the cyclone separator 14 back into the inside of the reactor main body 1 through the sludge discharge pipe 18, so as to realize the interception and reflux of the sludge. This process ensures that the reactor always maintains sufficient amount of sludge, strengthens the sludge retention, improves the sludge concentration, and further enhances the denitrification effect.

[0046] In summary, the present application realizes uniform water distribution through the water distribution plate 3, effectively avoids the short flow phenomenon caused by the floating and gathering of sludge through the effect of sludge-water countercurrent and the gas-solid separation device 5; the cyclone separation device and the capacity pump 17 realize the functions of sludge interception and reflux respectively, which ensures the sufficient amount of sludge in the reactor, strengthens the sludge retention, improves the sludge concentration, and enhances the denitrification effect.

[0047] In addition, the reactor utilizes the sludge-water countercurrent effect to avoid the floating and gathering of sludge, promotes the full contact of solid and liquid, and utilizes the cyclone separation device and the capacity pump 17 to realize the functions of sludge interception and reflux respectively, which ensures the sufficient amount of sludge in the reactor, provides a solid foundation for the continuous, stable and efficient operation of the anaerobic ammonia oxidation reactor, and also guarantees the standard discharge of the wastewater denitrification project, which has significant environmental and economic benefits.

[0048] Embodiment two: the embodiment is a further description of the above embodiment, and it should be understood that the embodiment includes all the technical features described above and is further described in detail.

[0049] According to the accompanying drawings Figure 5 As shown, a sludge-water countercurrent type anaerobic ammonia oxidation reactor comprises an auxiliary denitrification unit, the auxiliary denitrification unit comprises a filter plate 20 which is slidably connected to the riser 7, and a plurality of holes are formed in the filter plate 20, so that the water in the reactor main body 1 can enter the riser 7 through the holes, and the through amount of granular sludge can be greatly reduced through the arrangement of the holes.

[0050] Specifically, according to the accompanying drawings Figure 5 and the accompanying drawings Figure 6As shown, the filter plate 20 is provided with a sliding sleeve 21, and the end of the sliding sleeve 21 away from the filter plate 20 is provided with a rifle barrel 22, the sliding sleeve 21 and the rifle barrel 22 are slidingly connected outside the riser 7, the rifle barrel 22 is provided with a plurality of sleeve sleeves 23, the sleeve sleeves 23 and the rifle barrel 22 are slidingly connected, the rifle barrel 22 is provided with a spiral track, and the sleeve sleeves 23 are provided with protrusions matched with the spiral track. Among them, the principle of the rifle barrel 22 and the sleeve sleeve 23 is mainly to convert linear motion into spiral motion, or to convert spiral motion into linear motion.

[0051] The sleeve sleeve 23 is provided with a dispersion blade 24, and the sleeve sleeves 23 are provided with a connecting sleeve 25, the sleeve sleeves 23 are provided with a first connecting frame 26 on the side away from the sleeve sleeves 23, and the end of the first connecting frame 26 away from the sleeve sleeves 23 is installed on the inner wall of the reactor body 1.

[0052] It should be understood that when the rifle barrel 22 is driven to perform the telescopic motion, the sleeve sleeve 23 performs the rotary motion outside the rifle barrel 22, so as to drive the dispersion blade 24 to rotate and beat and disperse the granular sludge in the reactor body 1.

[0053] Further, according to the drawings Figure 7 As shown, the sliding sleeve 21 is also provided with a rack column 27, and a plurality of gears 28 are annularly distributed on the rack column 27, the rack column 27 and the gears 28 are meshingly connected, the gears 28 are provided with a rotating shaft 29, the rotating shaft 29 is provided with a swing arm 30, a plurality of dispersion rods 31 are installed on the swing arm 30, the rotating shaft 29 is provided with a second connecting frame 32, and the end of the second connecting frame 32 away from the rack column 27 is installed on the inner wall of the reactor body 1.

[0054] It should be noted that when the rifle barrel 22 moves up and down reciprocally, the rack column 27 is driven to move up and down synchronously, and through the meshing connection of the rack column 27 and the gears 28, the rotating shaft 29 is controlled to rotate synchronously, so that the swing arm 30 swings up and down, and the dispersion rods 31 are driven together to disperse the granular sludge, and the nitrogen gathered in the granular sludge is assisted to be separated.

[0055] In specific implementation, a linear driving component such as an electric push rod or an air cylinder is installed at the bottom of the reactor body 1, and the telescopic end of the electric push rod or the air cylinder is connected with the filter plate 20, and the filter plate 20 is driven to move up and down through the telescopic motion of the electric push rod or the air cylinder.

[0056] In the denitrification reaction zone II, part of the nitrogen gas will gather in the granular sludge and be difficult to discharge. The auxiliary denitrification unit can beat and disperse the granular sludge, and assist in separating the nitrogen gas gathered in the granular sludge, thereby improving the denitrification efficiency. Because the conventional method only relies on the countercurrent effect of sludge and water and the impact of the granular sludge on the gas-solid separation device 5, the overflow of the nitrogen gas from the granular sludge is limited, and the auxiliary denitrification unit can further strengthen this process.

[0057] In this embodiment, by beating and dispersing the granular sludge, the structure of the granular sludge is more loose, which helps to increase the contact area with the reaction liquid, enhance the reaction effect, and promote the granulation of the sludge, thereby strengthening the sludge retention and improving the sludge concentration. Moreover, by dispersing the granular sludge, in combination with the countercurrent effect of sludge and water, the floating of the sludge can be reduced, the short flow phenomenon caused by the floating and gathering of the sludge can be avoided, and the stability and efficiency of the reaction of the water flow and the sludge in the reactor can be ensured.

[0058] In addition, by beating and dispersing the granular sludge, the denitrification reaction in the reactor body 1 is more sufficient, the influence of the nitrogen gas gathering and the poor state of the sludge on the operation effect of the reactor is reduced, the long-term stable operation of the reactor is ensured, and the overall denitrification performance is improved.

[0059] Embodiment Three: The present embodiment is a further description of the above-mentioned embodiments. It should be understood that the present embodiment includes all the technical features described above and is further described in detail.

[0060] According to the accompanying drawings Figure 1 to the accompanying drawings Figure 7 As shown in the accompanying drawings, a denitrification method of a sludge-water countercurrent anaerobic ammonia oxidation reactor is used in the sludge-water countercurrent anaerobic ammonia oxidation reactor disclosed in Embodiment One, and the steps are as follows:

[0061] The nitrogen-containing wastewater to be treated enters the water distribution and gas collection zone I through the water inlet pipe 2, and the wastewater enters the lower denitrification reaction zone II through the water distribution holes 4 uniformly distributed on the water distribution plate 3.

[0062] In the denitrification reaction zone II, the wastewater undergoes denitrification reaction under the action of microorganisms in the sludge, part of the nitrogen gas gathered in the granular sludge cannot be discharged, and the entire granular sludge will float upward; another part of the nitrogen gas escapes from the granular sludge and pushes other granular sludge upward when moving upward.

[0063] When the floating granular sludge hits the gas-solid separation device 5, the gas in the sludge will escape; at the same time, the wastewater flowing downward through the gap between the water distribution holes 4 and the gas-solid separation device 5 will impact the floating granular sludge, forming a countercurrent effect of sludge and water, and the gas in the sludge can also escape, and the escaped gas enters the adjacent gas collection chamber 19 together, and then enters the cyclone separator 14 through the exhaust pipe 6 for three-phase separation.

[0064] The water flow in the reactor body 1 continues to flow downward to the bottom flow guide water collecting area III, is collected by the flow guide plate 11 and the water collecting cover 12, and is then merged into the middle riser 7. The water flow in the riser 7 enters the cyclonic separator 14 at a certain flow rate together with the water flow in the exhaust pipe 6 to perform three-phase separation. The gas is discharged through the gas outlet pipe 15 at the top of the cyclonic separator 14, the water is discharged from the water outlet pipe 16 at the side of the cyclonic separator 14, and the sludge is discharged from the bottom of the cyclonic separator 14 and is pumped to the denitrification reaction area II through the sludge discharge pipe 18 under the action of the capacity pump 17.

[0065] During the operation of the reactor body 1, the mud-water countercurrent effect formed by the impact of the downward flowing water flow on the upward floating sludge can reduce the upward floating of the sludge, thereby avoiding the short flow phenomenon caused by the upward floating and gathering of the sludge. On the other hand, the mud-water countercurrent effect can also promote the granulation of the sludge, strengthen the sludge retention, increase the sludge concentration, and enhance the denitrification removal effect.

[0066] At the same time, during the operation of the reactor body 1, sampling can be performed through the different height sampling ports 10 at regular intervals to observe the change in the sludge properties. When the sludge concentration in the reactor body 1 is low, resulting in poor denitrification effect, appropriate granular sludge can be supplemented through the sludge feeding pipe 9.

[0067] When a fault occurs in the reactor body 1, the internal mud-water needs to be discharged through the vent pipe, and then the maintenance opening 8 is used to enter and check the maintenance.

[0068] The above describes the embodiments of the specific embodiments, but the embodiments are not limited to the above specific embodiments. The above specific embodiments are only illustrative and not restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the embodiments, which are all within the protection scope of the embodiments.

Claims

1. A sludge-water countercurrent anaerobic ammonia oxidation reactor, characterized in that, The reactor body (1) is divided into a water distribution and gas collection zone (Ⅰ), a denitrification reaction zone (Ⅱ) and a flow guiding and water collection zone (Ⅲ). A mud-water separation zone (Ⅳ) is also provided above the reactor body (1). The water distribution and gas collection area (Ⅰ) is provided with a water distribution unit, which includes a water inlet pipe (2) installed on the reactor body (1) and a water distribution plate (3) set in the reactor body (1). The water distribution plate (3) is evenly distributed with a number of water distribution holes (4). The water distribution plate (3) is also provided with a gas-solid separation device (5) and a gas collection chamber (19), and an exhaust pipe (6) is installed on the gas collection chamber (19). The denitrification reaction zone (II) and the water collection zone (III) are equipped with rising units. The rising unit includes a rising pipe (7) installed inside the reactor body (1) and a guide plate (11) installed inside the reactor body (1). The guide plate (11) is located in the water collection zone (III). A water collection cover (12) is installed at one end of the rising pipe (7) near the guide plate (11). The mud-water separation zone (Ⅳ) is equipped with a three-phase separation unit, which includes a cyclone separator (14) installed on the reactor body (1). The cyclone separator (14) is equipped with an air outlet pipe (15), a water outlet pipe (16), a volumetric pump (17), and a sludge discharge pipe (18). The volumetric pump (17) is equipped with an input end and an output end. The input end of the volumetric pump (17) is connected to the sludge discharge pipe (18), and the output end of the volumetric pump (17) is connected to the inside of the connector body.

2. The sludge-water countercurrent anaerobic ammonia oxidation reactor according to claim 1, characterized in that, The height-to-diameter ratio of the denitrification reaction zone (II) is 3 to 8, and the water flow velocity in the denitrification reaction zone (II) is 3 m / s to 6 m / s.

3. The sludge-water countercurrent anaerobic ammonia oxidation reactor according to claim 1, characterized in that, The water distribution plate (3) is in the shape of a disc, and the diameter of the water distribution hole (4) is 6mm to 12mm depending on the water flow velocity at the outlet hole of 2m / s to 5m / s.

4. The sludge-water countercurrent anaerobic ammonia oxidation reactor according to claim 1, characterized in that, The gas-solid separation device (5) has an angle of 60°. The gas-solid separation device (5) includes a long plate and a short plate. The angle between the long plate and the short plate and the vertical direction is 30°. The length ratio of the long plate to the short plate is 1.2~1.

5.

5. The sludge-water countercurrent anaerobic ammonia oxidation reactor according to claim 1, characterized in that, The transverse length from the end of the short plate in the gas-solid separation device (5) to the long plate in the adjacent gas-solid separation device (5) is 40mm to 80mm.

6. The sludge-water countercurrent anaerobic ammonia oxidation reactor according to claim 1, characterized in that, The upward velocity of the water flow in the riser pipe (7) is 5 to 12 m / s.

7. The sludge-water countercurrent anaerobic ammonia oxidation reactor according to claim 1, characterized in that, It also includes an auxiliary denitrification unit, which includes a filter plate slidably connected to the riser pipe, and the filter plate has several holes.

8. A sludge-water countercurrent anaerobic ammonia oxidation reactor according to claim 7, characterized in that, A sliding sleeve is installed on the filter plate, and a reciprocating rod is installed at the end of the sliding sleeve away from the filter plate. The sliding sleeve and the reciprocating rod are slidably connected to the outside of the riser pipe. The reciprocating rod is provided with multiple rod sleeves, and a dispersing blade is installed on the rod sleeves. A connecting sleeve is installed between the rod sleeves. A first connecting frame is connected to the side of the rod sleeves away from each other by a bearing, and the end of the first connecting frame away from the rod sleeve is installed on the inner wall of the reactor body.

9. A sludge-water countercurrent anaerobic ammonia oxidation reactor according to claim 8, characterized in that, The sliding sleeve is also equipped with a rack column, and multiple gears are distributed in a ring on the rack column. The rack column and the gears are meshed. A rotating shaft is installed on the gear, and a swing arm is installed on the rotating shaft. Multiple dispersing rods are installed on the swing arm. A second connecting frame is connected to the rotating shaft by a bearing, and the end of the second connecting frame away from the rack column is installed on the inner wall of the reactor body.

10. A method for nitrogen removal from a sludge-water countercurrent anaerobic ammonia oxidation reactor, using a sludge-water countercurrent anaerobic ammonia oxidation reactor as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. The nitrogen-containing wastewater to be treated enters the water distribution and gas collection zone (Ⅰ) through the inlet pipe (2), and then flows into the lower denitrification reaction zone (Ⅱ) through the water distribution holes (4) evenly distributed on the water distribution plate (3). S2. In the denitrification reaction zone (II), the wastewater undergoes a denitrification reaction under the action of sludge microorganisms. Some of the nitrogen gas produced by the reaction accumulates inside the granular sludge, causing the granular sludge to float to the surface; the other part of the nitrogen gas escapes and pushes other granular sludge upwards together. S3. The floating granular sludge impacts the gas-solid separation device (5), and the gas inside the sludge escapes. At the same time, the wastewater flowing downward through the gap between the water distribution hole (4) and the gas-solid separation device (5) impacts the floating granular sludge, forming a mud-water countercurrent effect, which causes the gas inside the sludge to escape. The escaped gas enters the gas collection chamber (19) together, and then enters the cyclone separator (14) through the exhaust pipe (6) for three-phase separation. S4. The water in the reactor body (1) continues to flow downward to the bottom guide water collection area (Ⅲ), and is collected by the guide plate (11) and the water collection cover (12) and flows into the middle riser pipe (7). The water in the riser pipe (7) and the exhaust pipe (6) enter the hydrocyclone separator (14) for three-phase separation at a certain flow rate. The gas is discharged from the top gas outlet pipe (15) of the hydrocyclone separator (14), the water is discharged from the side water outlet pipe (16), and the sludge is discharged from the bottom and pumped back to the denitrification reaction area (Ⅱ) by the capacity pump (17) through the sludge discharge pipe (18). S5. When the reactor body (1) is running, the mud-water countercurrent effect is used to reduce sludge floating and avoid short-flow phenomenon caused by floating and agglomeration. At the same time, it promotes sludge granulation and strengthens sludge retention.

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