Efficient carbon and nitrogen supplemented biological enhanced removal device for groundwater nitrate

Abstract

The present invention provides an efficient device and method for biological enhanced removal of nitrate in groundwater with carbon and nitrogen supplementation. The filler bin includes a first outer frame body, an upper net plate is embedded in the top opening of the first outer frame body, and a lower net plate is embedded in the bottom opening. The inside of the first outer frame body is filled with filter fillers; the microorganism bin includes a second outer frame body, and the inside of the second outer frame body is separated into multiple independent purification chambers by partition plates. A plurality of microorganism loading beds are arranged at intervals from top to bottom in each purification chamber; a medium supplement frame is slidably installed outside the second outer frame body. The side cross-section of the medium supplement frame is rectangular, and the medium supplement frame is communicated with a medium supply assembly. When the medium supplement frame moves to a purification chamber, it can simultaneously block the top opening and the bottom opening of the purification chamber, so that the purification chamber is in a closed state. In this way, the promoting medium filled in the medium supplement frame can stay in the purification chamber, and the microorganisms can be infiltrated in the promoting medium.

Description

Technical Field

[0001] The present invention relates to the technical field of groundwater purification treatment, and particularly relates to an efficient carbon and nitrogen supplemented biological enhanced removal device for nitrate in groundwater. Background Art

[0002] The permeable reactive barrier (PRB) technology has the advantages of high treatment efficiency, small disturbance to the water environment, low operating cost, and relatively mature application. In recent years, it has been widely used. The key of the PRB technology lies in the selection of fillers. The mechanism of removing nitrate in groundwater by the permeable reactive barrier technology is mainly to permanently remove nitrate in groundwater by the metabolic action of denitrifying bacteria, with low operation and maintenance costs, which is a green remediation technology.

[0003] However, the following problems exist in the actual operation process: The denitrifying bacteria in groundwater have a large demand for carbon source and nitrogen source. At present, most of the addition methods are to input them into the reaction wall through the feeding pipe regularly. However, after the input carbon source and nitrogen source are injected, they will quickly flow and diffuse with the groundwater, and the contact time between microorganisms and the carbon source and nitrogen source is short. Although the carbon source and nitrogen source are put in regularly, due to the insufficient absorption of microorganisms, the activity of microorganisms remains low and the rate of nitrate degradation is relatively slow.

[0004] In summary, there is a need for a biological enhanced removal device for nitrate in groundwater that can efficiently supplement nutrient media such as carbon source and nitrogen source. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides an efficient carbon and nitrogen supplemented biological enhanced removal device for nitrate in groundwater, which solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0007] An efficient carbon and nitrogen supplemented biological enhanced removal device for nitrate in groundwater includes an outer housing. A top plate and a bottom plate are installed at intervals inside the outer housing. The area of the outer housing above the top plate is the liquid inlet chamber, the area between the top and the bottom plate of the outer housing is the filtration chamber, and the area of the outer housing below the bottom plate is the liquid outlet chamber. A stacked microbial filtration component is installed inside the filtration chamber. The microbial filtration component includes a filler bin and a microbial bin. There are multiple filler bins and microbial bins, and the number of both is the same. The filler bins and microbial bins are stacked from top to bottom in sequence.

[0008] The filler bin includes a first outer frame body. A top net plate is embedded in the top opening of the first outer frame body, and a bottom net plate is embedded in the bottom opening. The inside of the first outer frame body is filled with filter fillers.

[0009] The microorganism bin comprises a second outer frame, the interior of the second outer frame is divided into a plurality of independent purification chambers by a partition, and a plurality of microorganism load beds are arranged from top to bottom in each purification chamber; a medium replenishment frame is slidably mounted on the outside of the second outer frame, the side cross-section of the medium replenishment frame is rectangular, and the medium replenishment frame is connected to the medium supply assembly;

[0010] When replenishing the promotion medium, the medium replenishment box:

[0011] The medium replenishing frame moves along the second outer frame to each purification chamber in sequence, and the medium replenishing frame blocks the upper and lower openings of the purification chamber, so that the purification chamber is in a closed state;

[0012] The medium supplement frame injects the promoting medium into the closed purification chamber, so that the microorganisms on the microorganism load bed are infiltrated in the promoting medium.

[0013] Furthermore, the medium replenishment frame includes an upper sealing plate, a first side translation assembly, a second side translation assembly and a lower sealing plate; the upper sealing plate is slidably installed on the surface of the second outer frame, and the lower sealing plate is slidably installed on the bottom surface of the second outer frame. The first side translation assembly and the second side translation assembly are slidably placed on both sides of the interior of the second outer frame, and the top of the first side translation assembly is connected to one end of the upper sealing plate, and the bottom end is connected to one end of the lower sealing plate; the top of the second side translation assembly is connected to the other end of the upper sealing plate, and the bottom end is connected to the other end of the lower sealing plate; the side of the first side translation assembly is connected to the medium supply assembly; the upper sealing plate is used to seal the top opening of the purification chamber, and the lower sealing plate is used to seal the bottom opening of the purification chamber.

[0014] Furthermore, the first side translation assembly and the second side translation assembly have the same structure; the first side translation assembly includes a vertical plate, a horizontal plate, a movable seat, and a driving screw; the top end of the vertical plate is connected to the end of the upper sealing plate, and the bottom end is connected to the end of the lower sealing plate, a horizontal plate is vertically provided in the middle of the side wall of the vertical plate, and a movable seat is provided at the outer end of the horizontal plate, the movable seat is slidably fitted on the outer wall of the second outer frame, and the internal thread of the movable seat is penetrated by the driving screw.

[0015] Furthermore, a first tube body is installed inside the upper sealing plate, a first external tube passes through the movable seat, the horizontal plate, and the vertical plate in sequence, and its end is connected to the first tube body, and the other end of the first external tube away from the first tube body is connected to the medium supply assembly; the first tube body is used to output the promotion medium into the closed purification chamber;

[0016] A second tube body is installed inside the lower sealing plate, and the second external tube passes through the movable seat, the horizontal plate, and the vertical plate in sequence and its end is connected to the first tube body, and the other end of the second external tube facing away from the second tube body is connected to the waste liquid tank; the second external tube is used to extract the waste liquid in the closed purification chamber to the external waste liquid tank.

[0017] Further, a scraping plate for scraping dirt on the surface of the upper net plate is provided on the bottom surface of the lower sealing plate.

[0018] Further, an ultrasonic generator is built in the lower sealing plate, and the ultrasonic generator is used to generate ultrasonic waves to clean impurities in the microbial load bed.

[0019] Further, a plurality of groups of stirring components are provided inside the first outer frame body. Each group of stirring components includes stirring rods distributed in a linear array. The top ends of the stirring rods are rotatably connected to the inner wall of the upper net plate, and the bottom ends thereof rotatably penetrate through the lower net plate. A driven gear is provided at the bottom end of the stirring rod;

[0020] A linkage plate is arranged opposite to the stirring component on the top surface of the upper sealing plate. The linkage plate includes a side plate body, and a tooth groove matching with the driven gear is formed on the inner wall of the side plate body; the linkage plate is meshed and connected with the driven gear;

[0021] When the second outer frame body moves horizontally, the side plate body drives the driven gear in meshing contact therewith to rotate, so as to drive the stirring rod to stir and clean impurities in the filter packing.

[0022] Further, the linkage plate further includes a liquid guide plate. The side plate body and the liquid guide plate are integrally connected in an L shape. Liquid guide holes are formed on the surface of the liquid guide plate and are distributed opposite to the stirring component. A third pipe body is installed inside the upper sealing plate, and the third pipe body is communicated with each liquid guide hole. The third pipe body and the first pipe body are connected in parallel to the first outer connecting pipe through a three-way valve;

[0023] An elastic joint is provided at the bottom of the driven gear. The stirring rod is of a hollow structure, and liquid discharge holes are formed on the bottom surface of the stirring part of the stirring rod; when the elastic joint is in fit and insertion with the liquid guide hole below it,

[0024] The flushing water input from the first outer connecting pipe is discharged to the stirring rod through the third pipe body, the liquid guide hole and the elastic joint in sequence, so as to directly flush the filter packing.

[0025] A method for biological enhanced removal of nitrate in groundwater with high-efficiency carbon and nitrogen supplementation, the biological enhanced removal method includes the following steps:

[0026] S1. Groundwater purification:

[0027] Groundwater enters the filter chamber from the liquid inlet chamber;

[0028] The groundwater sequentially passes through the packing chamber and the microbial chamber. The filter packing absorbs impurities in the groundwater, and the microbial load bed in the microbial chamber adsorbs and treats nitrate in the groundwater;

[0029] The treated groundwater is discharged through the liquid outlet chamber;

[0030] S2. Timed promotion of medium supplementation:

[0031] S2.1. The second outer housing moves to above a purification chamber, the upper sealing plate and the lower sealing plate seal this purification chamber, while other purification chambers maintain the purification water flow, and the biological enhancement removal device keeps working;

[0032] S2.2. Backwash the packing bin and the medium replenishment frame;

[0033] S2.3. The ultrasonic generator on the lower sealing plate works, and the ultrasonic waves emitted by the ultrasonic generator are dispersed in the closed state to shake off the attachments on the microbial load bed, and the shaken-off attachments remain in the liquid in the closed purification chamber;

[0034] S2.4. The liquid extraction pump on the waste liquid tank works, and the liquid in the closed state is sucked out under negative pressure to the second pipe body, and then discharged to the waste liquid tank through the second external connection pipe until the liquid in the closed purification chamber is evacuated;

[0035] S2.5. The medium supply assembly inputs the promoting medium to the first external connection pipe, and then the promoting medium is discharged into the closed purification chamber through the first pipe body of the upper sealing plate; the microorganisms on the microbial load bed are infiltrated in the promoting medium, so that the microorganisms fully absorb the carbon source and nitrogen source;

[0036] S3. The medium supply continues to move to the next purification chamber, and S2.1 - S2.5 are repeated until all the purification chambers are replenished with the promoting medium.

[0037] Further, in S2.1, when the second outer housing moves to above the purification chamber, the following actions are also synchronously performed:

[0038] The tooth grooves of the side plate body are engaged with the driven gears at the bottom ends of the stirring rods one by one, thereby driving the stirring rods to rotate to stir the filter packing in the packing bin, so that the attachments on the outer wall of the filter packing fall off;

[0039] The scraper gradually clears the dirt attached to the upper net plate;

[0040] When the second outer housing completely seals the purification chamber, the elastic joint is snapped into the liquid guide hole in the liquid guide plate.

[0041] The present invention provides a biological enhanced removal device for nitrate in groundwater with high - efficiency carbon and nitrogen supplementation. Compared with the prior art, it has the following beneficial effects:

[0042] 1. The entire filtration system is designed as an independently arranged packing bin and microbial bin. During the initial installation and subsequent replacement of the packing and microorganisms, they can be lifted one by one, with high construction efficiency and simple maintenance. The packing bin and the microbial bin can be reasonably arranged in number according to the water quality requirements, with high flexibility;

[0043] 2. The microbial chamber is divided into multiple identical and independent purification chambers. A movable medium supplement frame is installed in the microbial chamber. When it is necessary to add promoting medium to the microorganisms in the purification chamber, the medium supplement frame can be moved to the outside of each purification chamber in turn to add one by one, while other purification chambers can still perform purification work without affecting the normal flow of groundwater;

[0044] 3. When the medium replenishing frame moves to a purification chamber, it can simultaneously block the top opening and the bottom opening of the purification chamber, so that the purification chamber is in a closed state. In this way, the promoting medium filled with the medium replenishing frame can be retained in the purification chamber, and the microorganisms can be immersed in the promoting medium, leaving enough absorption time for the microorganisms, solving the problem of insufficient microbial absorption caused by the rapid dispersion and flow of the promoting medium in the past. The replenishment of the promoting medium is more efficient and the biological removal intensity is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 The schematic diagram of the structure of the high-efficiency carbon-nitrogen supplementation type groundwater nitrate biological enhancement removal device of the present invention is shown;

[0047] Figure 2 A schematic diagram of the cross-sectional structure of the packing bin of the present invention is shown;

[0048] Figure 3 The overall structural schematic diagram of the packing bin of the present invention is shown;

[0049] Figure 4 A schematic diagram of the cross-sectional structure of the microorganism warehouse of the present invention is shown;

[0050] Figure 5 The overall structural schematic diagram of the microorganism warehouse of the present invention is shown;

[0051] Figure 6 A schematic diagram of the linkage plate structure of the present invention is shown;

[0052] Figure 7 A schematic diagram of the coordination structure between the stirring rod and the linkage plate of the present invention is shown;

[0053] Figure 8 The schematic diagram of the upper sealing plate and the lower sealing plate structure of the present invention is shown;

[0054] Figure 9Shows a schematic diagram of the purification chamber distribution structure of the present invention;

[0055] As shown in the figure: 1. Outer chamber body; 11. Water inlet; 12. Maintenance opening; 13. Water outlet; 14. Top plate; 15. Bottom plate; 2. Packing chamber; 21. First outer frame body; 22. Upper mesh plate; 23. Lower mesh plate; 24. Stirring rod; 241. Driven gear; 242. Elastic joint; 3. Microbial chamber; 31. Second outer frame body; 311. Upper sliding groove; 312. Middle sliding groove; 313. Lower sliding groove; 314. Side sliding groove; 315. Slide block; 32. Upper sealing plate; 321. Side sliding seat; 322. Three-way valve; 323. First pipe body; 3231. Sprayer; 324. Ultrasonic generator; 325. Second pipe body; 3251. Liquid guiding joint; 33. First side translation assembly; 331. Vertical plate; 332. Horizontal plate; 333. Moving seat; 334. Driving screw; 34. Second side translation assembly; 35. Lower sealing plate; 351. Scraper; 352. Third pipe body; 36. Microbial load bed; 37. Linking plate; 371. Side plate body; 3711. Tooth groove; 372. Liquid guiding plate; 3721. Liquid guiding hole; 38. Partition board. Specific embodiments

[0056] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0057] To solve the technical problems in the background art, the following highly efficient carbon and nitrogen supplemented biological enhanced removal device for groundwater nitrate is provided:

[0058] Combined with Figures 1 - 5 As shown, the highly efficient carbon and nitrogen supplemented biological enhanced removal device for groundwater nitrate provided by the present invention includes an outer chamber body 1, and a top plate 14 and a bottom plate 15 are installed at intervals inside the outer chamber body 1; the area of the outer chamber body 1 above the top plate 14 is the liquid inlet chamber, the area between the top and the bottom plate 15 of the outer chamber body 1 is the filtration chamber, and the area of the outer chamber body 1 below the bottom plate 15 is the liquid outlet chamber; a stacked microbial filtration assembly is installed inside the filtration chamber, and the microbial filtration assembly includes a packing chamber 2 and a microbial chamber 3; there are multiple packing chambers 2 and microbial chambers 3, and the numbers of both are the same, and the packing chambers 2 and microbial chambers 3 are stacked from top to bottom in sequence;

[0059] The filler bin 2 includes a first outer frame 21. A top-opening of the first outer frame 21 is embedded with an upper net plate 22, and a bottom-opening is embedded with a lower net plate 23. The interior of the first outer frame 21 is filled with filter packing materials;

[0060] The microorganism bin 3 includes a second outer frame 31. The interior of the second outer frame 31 is divided into multiple independent purification chambers by a partition 38. Multiple microorganism loading beds 36 are arranged at intervals from top to bottom in each purification chamber; A medium supplement frame is slidably installed outside the second outer frame 31. The side cross-section of the medium supplement frame is rectangular, and the medium supplement frame is communicated with a medium supply assembly;

[0061] When the medium supplement frame supplements the promoting medium: the medium supplement frame moves along the second outer frame 31 to each purification chamber in turn. The medium supplement frame seals the upper and lower openings of the purification chamber to make the purification chamber in a closed state; The medium supplement frame injects the promoting medium into the closed purification chamber, so that the microorganisms on the microorganism loading bed 36 are immersed in the promoting medium.

[0062] The interior of the filler bin 2 is filled with other filter materials such as zeolite and activated carbon. Two groups of microorganism loading beds 36 are arranged in the microorganism bin 3. The body of the microorganism loading bed 36 is a wire mesh plate. Resin is attached to the steel wire of the wire mesh plate, and microorganisms that adsorb nitrates are loaded on the resin.

[0063] The side wall of the water inlet chamber is provided with a water inlet 11, and the top is provided with a maintenance port 12. The bottom of the water outlet chamber is provided with a water outlet 13, and a bottom plate 15 for supporting the microorganism bin 3 is arranged inside;

[0064] The above technical solution has the following technical effects:

[0065] 1. The biological removal device is designed in a stacked and filtered manner from top to bottom, which can utilize the gravity of the downward flow of water to improve the transportation efficiency and can alleviate the problem of easy blockage of the traditional wall-blocking method to a certain extent;

[0066] 2. The entire filtration system is designed as an independently arranged filler bin 2 and microorganism bin 3. During the initial installation and subsequent replacement of fillers and microorganisms, they can all be lifted one by one, with high construction efficiency and simple maintenance. The filler bin 2 and the microorganism bin 3 can be reasonably arranged in terms of the number according to the water quality requirements, with high flexibility;

[0067] 3. The microorganism bin 3 is divided into multiple identical and independent purification chambers, and a movable medium supplement frame is installed inside the microorganism bin 3. When it is necessary to add a promoting medium to the microorganisms in the purification chamber, the medium supplement frame can move to the outside of each purification chamber in turn to achieve one-by-one addition, while other purification chambers can still carry out purification work without affecting the normal flow of groundwater;

[0068] 4. When the medium replenishment frame moves to a purification chamber, it can simultaneously block the top opening and the bottom opening of the purification chamber, making the purification chamber in a closed state. In this way, the promoting medium filled in the medium replenishment frame can stay in the purification chamber, and the microorganisms can be infiltrated in the promoting medium, leaving enough absorption time for the microorganisms, solving the problem that the promoting medium quickly spreads and flows away in the past, resulting in insufficient absorption by the microorganisms. The replenishment of the promoting medium is more efficient, and the biological removal intensity is improved.

[0069] In this embodiment, the medium replenishment frame includes an upper sealing plate 32, a first side translation assembly 33, a second side translation assembly 34, and a lower sealing plate 35. The upper sealing plate 32 is slidably installed on the surface of the second outer frame 31, the lower sealing plate 35 is slidably installed on the bottom surface of the second outer frame 31, the first side translation assembly 33 and the second side translation assembly 34 are slidably placed on both sides inside the second outer frame 31. The top end of the first side translation assembly 33 is connected to one end of the upper sealing plate 32, and the bottom end is connected to one end of the lower sealing plate 35. The top end of the second side translation assembly 34 is connected to the other end of the upper sealing plate 32, and the bottom end is connected to the other end of the lower sealing plate 35. The side of the first side translation assembly 33 is communicated with the medium supply assembly. The upper sealing plate 32 is used to block the top opening of the purification chamber, and the lower sealing plate 35 is used to block the bottom opening of the purification chamber.

[0070] In the above solution, the medium replenishment frame is composed of four parts. The upper sealing plate 32 and the lower sealing plate 35 are used to block the upper and lower openings of the purification chamber respectively, so as to form a closed purification chamber with the two partition plates 38. The left and right first side translation assemblies 33 and second side translation assemblies 34 can stably reciprocate the upper sealing plate 32 and the lower sealing plate 35.

[0071] In this embodiment, the structures of the first side translation assembly 33 and the second side translation assembly 34 are the same. The first side translation assembly 33 includes a vertical plate 331, a horizontal plate 332, a moving seat 333, and a driving screw 334. The top end of the vertical plate 331 is connected to the end of the upper sealing plate 32, and the bottom end is connected to the end of the lower sealing plate 35. A horizontal plate 332 is vertically provided in the middle of the side wall of the vertical plate 331. A moving seat 333 is provided at the outer end of the horizontal plate 332. The moving seat 333 is slidably attached to the outer wall of the second outer frame 31, and a driving screw 334 is threaded through the inside of the moving seat 333.

[0072] In the above solution, one end of the driving screw 334 is connected to a driving motor, and the driving motor is arranged on the inner wall of the outer bin 1. When the driving screw 334 rotates, it can drive the moving seat 333 to translate, and then drive the vertical plate 331 to translate through the horizontal plate 332. When the vertical plate 331 translates, it can simultaneously drive the upper sealing plate 32 and the lower sealing plate 35 connected thereto to move. The moving seat 333 is arranged outside the second outer frame 31. In this way, the moving seat 333 can move and can also remain connected to the external medium supply assembly.

[0073] In order to improve the stability and smoothness of the movement of the vertical plate 331, the horizontal plate 332, the upper sealing plate 32, and the lower sealing plate 35; a slide groove is opened inside the second outer frame 31, the top of the slide groove is the upper slide groove 311, the lower part is the lower slide groove 313, the middle part of the slide groove is the middle slide groove 312, the middle slide groove 312 is connected with the upper slide groove 311 and the lower slide groove 313, the width of the middle slide groove 312 is smaller than the width of the upper slide groove 311 and the lower slide groove 313; the side of the middle slide groove 312 is connected with the side slide groove 314;

[0074] The vertical plate 331 is guided in the middle slide groove 312, and the horizontal plate 332 is guided in the side slide groove 314. The two ends of the upper sealing plate 32 are provided with downwardly bent side sliding seats 321, and the side sliding seats 321 are slidably embedded in the upper slide groove 311. The side sliding seats 321 are connected to the top of the vertical plate 331; the protrusions at the two ends of the lower sealing plate 35 are slidably embedded in the lower slide groove 313.

[0075] In this embodiment, a first tube body 323 is installed inside the upper sealing plate 32, and a first external tube passes through the movable seat 333, the horizontal plate 332, and the vertical plate 331 in sequence, and its end is connected to the first tube body 323, and the other end of the first external tube away from the first tube body 323 is connected to the medium supply assembly; the first tube body 323 is used to output the promotion medium to the closed purification chamber;

[0076] In the above scheme, the first external connection passes through the movable seat 333, the horizontal plate 332, and the vertical plate 331, which can ensure the diversion of the liquid medium without affecting the overall displacement of the medium replenishment frame; the first tube body 323 can discharge the promoting medium downward from the upper sealing plate 32 into the closed purification chamber, thereby promoting the supply of the medium.

[0077] In this embodiment, a second tube body 325 is installed inside the lower sealing plate 35, and the second external tube passes through the movable seat 333, the horizontal plate 332, and the vertical plate 331 in sequence and its end is connected to the first tube body 323, and the other end of the second external tube away from the second tube body 325 is connected to the waste liquid tank; the second external tube is used to extract the waste liquid in the closed purification chamber to the external waste liquid tank.

[0078] In the above scheme, the second external connection passes through the movable seat 333, the horizontal plate 332, and the vertical plate 331, which can ensure the guidance of the liquid medium without affecting the overall displacement of the medium replenishment frame; the second tube body 325 can extract the waste liquid from the lower sealing plate 35, realize the cleaning of the liquid containing impurities in the closed purification chamber, realize the external discharge of impurities, and will not have secondary residues, and at the same time it will also promote the discharge of the medium to leave the best space.

[0079] In this embodiment, a scraper 351 for scraping off dirt on the surface of the mesh plate 22 is provided on the bottom surface of the lower sealing plate 35 .

[0080] Since the screen plate 22 is on the top layer and has the most dirt attached to it, the scraper 351 is designed to clean the dirt on the screen plate 22 while the second outer frame 31 moves to replenish the promoting medium. There is no need for a separate cleaning process, and it can be completed simultaneously during the process of replenishing the promoting medium.

[0081] In this embodiment, the lower sealing plate 35 is internally provided with an ultrasonic generator 324 , and the ultrasonic generator 324 is used to generate ultrasonic waves to clean impurities in the microorganism load bed 36 .

[0082] By configuring an ultrasonic generator 324 in the lower sealing plate 35, impurities attached to the microbial load bed 36 can be cleaned before replenishing the promoting medium. This can improve the adsorption effect of microorganisms on nitrates and the biological adsorption effect. There is no need to perform a separate cleaning process, and it can be completed simultaneously during the process of replenishing the promoting medium. On the other hand, after cleaning the attachments, the second tube 325 extracts the waste liquid, the contact between the microorganisms and the promoting medium is more complete, and the efficiency of the microorganisms in obtaining the promoting medium is higher. Example

[0083] like Figure 1 and Figure 2 As shown, based on the above embodiment, this embodiment further provides the following contents:

[0084] The above technical solution realizes the cleaning of the microorganism bin 3, but since the filling bin 2 is arranged on the microorganism bin 3, if the filling bin 2 is not fully cleaned, the purification effect of the microorganism bin 3 is still poor;

[0085] In this embodiment, a plurality of stirring assemblies are provided inside the first outer frame 21, and each stirring assembly includes stirring rods 24 distributed in a linear array. The top end of the stirring rods 24 is rotatably connected to the inner wall of the upper mesh plate 22, and the bottom end is rotatably passed through the lower mesh plate 23. A driven gear 241 is provided at the bottom end of the stirring rods 24; a linkage plate 37 is arranged on the top surface of the upper sealing plate 32 opposite to the stirring assembly, and the linkage plate 37 includes a side plate body 371, and a tooth groove 3711 matching the driven gear 241 is provided on the inner wall of the side plate body 371; the linkage plate 37 is meshedly connected with the driven gear 241; when the second outer frame 31 translates, the side plate body 371 drives the driven gear 241 meshed with it to rotate, so as to drive the stirring rods 24 to stir and clean the impurities in the filter filler.

[0086] Through the above scheme, when the second outer frame 31 translates, the stirring rod 24 engaged therewith can be driven to rotate simultaneously, thereby stirring the filler in the filling bin 2, so that impurities are separated from the filler and then carried away by the action of groundwater to achieve cleaning.

[0087] In this embodiment, the linkage plate 37 further includes a liquid guide plate 372. The side plate body 371 and the liquid guide plate 372 are integrally connected in an L shape. Liquid guide holes 3721 are formed on the surface of the liquid guide plate 372 and are distributed opposite to the stirring assembly. A third pipe body 352 is installed inside the upper sealing plate 32. The third pipe body 352 communicates with each liquid guide hole 3721. The third pipe body 352 and the first pipe body 323 are connected in parallel to the first external connection pipe through a three-way valve 322;

[0088] An elastic joint 242 is provided at the bottom of the driven gear 241. The stirring rod 24 is of a hollow structure, and drain holes are formed on the bottom surface of the stirring part of the stirring rod 24; when the elastic joint is inserted into cooperation with the liquid guide hole 3721 below it,

[0089] The flushing water input from the first external connection pipe is discharged to the stirring rod 24 through the third pipe body 352, the liquid guide holes 3721, and the elastic joint in sequence, so as to directly flush the filter packing.

[0090] The stirring rod not only serves as a cleaning stirring structure but also as a liquid spraying structure;

[0091] When the medium supplement frame closes the purification cavity, the elastic joint is assembled with the liquid guide plate 372; thus, when entering the flushing process, part of the flushing water can be discharged from the first pipe body 323 through the first external connection pipe, and the other part is discharged to each stirring rod 24 through the liquid guide pipe. The flushing water performs backflushing on the first pipe body 323, and the water sprayed by the stirring rod 24 performs backflushing on the filter packing; thus, it is realized that during the medium supply process, the packing bin and the medium supplement frame are fully cleaned synchronously.

[0092] The microorganism is: the denitrifying bacteria are a mixture strain composed of one or more of Pseudomonas, Bacteroides, and Alishewanella.

[0093] The promoting medium includes a carbon source, a nitrogen source, and a pH regulator;

[0094] The carbon source is one or several of sodium acetate, acetic acid, glucose, and slow-release carbon source.

[0095] The nitrogen source is one or several of corn steep liquor, soybean cake powder, peanut cake powder, cottonseed powder, and fish meal.

[0096] The pH regulator is one or any combination of more than one of dipotassium hydrogen phosphate trihydrate, sodium hydroxide, and sodium bicarbonate.

[0097] Each attachment such as mucus, capsule, protein, polysaccharide, fulvic acid, etc.

[0098] The medium supply assembly includes a medium storage tank and a pump body. The medium storage tank includes a nitrogen source tank, a nitrogen source tank, and a PH regulator tank; Embodiment Two

[0099] Efficient biological enhanced removal method for nitrate in groundwater with carbon and nitrogen supplementation, the biological enhanced removal method comprising the following steps:

[0100] S1. Groundwater purification:

[0101] The groundwater enters the filtration chamber from the liquid inlet chamber;

[0102] The groundwater sequentially passes through the packing chamber 2 and the microbial chamber 3. The filtration packing absorbs impurities in the groundwater, and the microbial loading bed 36 in the microbial chamber 3 adsorbs nitrate in the groundwater;

[0103] The treated groundwater is discharged through the liquid outlet chamber;

[0104] S2. Timed promotion of medium supplementation:

[0105] S2.1. The second outer frame 31 moves to above a purification chamber, the upper sealing plate 32 and the lower sealing plate 35 seal the purification chamber, while the other purification chambers maintain purification water flow, and the biological enhanced removal device keeps working;

[0106] S2.2. Backwashing of the packing chamber 2 and the medium supplementation frame;

[0107] S2.3. The ultrasonic generator on the lower sealing plate 35 works, and the ultrasonic waves emitted by the ultrasonic generator are dispersed in the closed state to shake off the attachments on the microbial loading bed 36. The shaken-off attachments remain in the liquid in the closed purification chamber; this step is used to clean the microbial loading bed 36 in the process of adding the promoting medium, remove the attachments, which can improve the adsorption effect of the microorganisms and also improve the efficiency of the microorganisms absorbing the promoting medium in the subsequent steps;

[0108] S2.4. The liquid extraction pump on the waste liquid tank works, and the liquid in the closed state is sucked out under negative pressure to the second pipe body 325, and then discharged to the waste liquid tank through the second external connection pipe until the liquid in the closed purification chamber is evacuated; this step can, on the one hand, clean the attachments, avoid the attachments remaining in the purification chamber, and ensure the subsequent purification effect, and on the other hand, can vacate the purification chamber to leave space for the subsequent discharge of the promoting medium;

[0109] S2.5. The medium supply assembly inputs the promoting medium to the first external connection pipe, and then the promoting medium is discharged into the closed purification chamber through the first pipe body 323 of the upper sealing plate 32; the microorganisms on the microbial loading bed 36 are soaked in the promoting medium, enabling the microorganisms to fully absorb the carbon source and nitrogen source; in this step, the microorganisms are fully in contact with the promoting medium and can fully absorb the required nutrients;

[0110] S3. The medium supply continues to move to the next purification chamber, and S2.1-S2.5 are repeated until all purification chambers are replenished with the promoting medium; by cleaning one by one, the cleaning effect of a single purification chamber can be guaranteed without affecting the normal flow of groundwater.

[0111] As an improvement of the above technical solution, in S2.1, when the second outer frame 31 moves onto the purification chamber, it also performs the following actions simultaneously:

[0112] The tooth grooves 3711 of the side plate 371 mesh with the driven gear 241 at the bottom end of the stirring rod 24 one by one, thereby driving the stirring rod 24 to rotate, so as to stir the filter stuffing in the stuffing bin 2, so that the attachments on the outer wall of the filter stuffing fall off;

[0113] The scraper 351 gradually cleans the dirt attached to the screen 22;

[0114] When the second outer frame 31 completely closes the purification chamber, the elastic joint is inserted into the liquid guide hole 3721 in the liquid guide plate 372 .

[0115] In the above scheme, when the first outer frame 21 moves, it can synchronously drive the stirring rod 24 to rotate, so as to clean the filter filler, and the scraper 351 cleans the screen 22. There is no need to set up a separate cleaning structure, driving structure, and cleaning process. The cleaning process is completed in the process of promoting the addition of the medium, and the program setting is simpler.

[0116] In S2.2, the backwashing of the filling bin 2 and the medium replenishing frame is specifically as follows: the medium supply assembly is discharged to the first external pipe and the second external pipe through the hose, the first external pipe discharges the flushing water to the first pipe body 323 and the liquid guide pipe, and the first pipe body 323 is backwashed, the liquid guide pipe guides the backwashing water to the stirring rod 24, and the stirring rod 24 sprays the flushing water through each liquid spray hole to backwash the filter filler; the second external pipe discharges the flushing water to the second pipe body 325, and the second pipe body 325 is backwashed;

[0117] Before cleaning, the above-mentioned backwashing process is set up, so that the filter filler can be effectively cleaned simultaneously, and the first tube body 323 and the second tube body 325 can be cleaned to avoid blockage in subsequent processes. It can be backwashed and pre-self-checked; if the backwashing is not smooth, it means that the tube body is blocked, and an alarm can be sounded to remind the staff, who can increase the pressure or add medicine for treatment.

[0118] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0119] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. High-efficiency carbon and nitrogen supplemented biological enhanced removal device for groundwater nitrate, Characterized in that: It includes an outer chamber body, and a top plate and a bottom plate are installed at intervals inside the outer chamber body; the area of the outer chamber body above the top plate is the liquid inlet chamber, the area between the top and the bottom plate of the outer chamber body is the filtration chamber, and the area of the outer chamber body below the bottom plate is the liquid outlet chamber; a stacked microbial filtration component is installed inside the filtration chamber, and the microbial filtration component includes a filler chamber and a microbial chamber; both the filler chamber and the microbial chamber are provided with a plurality of them and the number of both is the same, and the filler chamber and the microbial chamber are stacked from top to bottom in sequence; The filler chamber includes a first outer frame body, an upper net plate is embedded at the top opening of the first outer frame body, a lower net plate is embedded at the bottom opening, and filter filler is filled inside the first outer frame body; The microbial chamber includes a second outer frame body, and the inside of the second outer frame body is divided into a plurality of independent purification chambers by partition plates, and a plurality of microbial loading beds are arranged at intervals from top to bottom inside each purification chamber; a medium supplement frame is slidably installed outside the second outer frame body, the side cross-section of the medium supplement frame is rectangular, and the medium supplement frame is communicated with the medium supply component; When the medium supplement frame supplements the promoting medium: The medium supplement frame moves along the second outer frame body to each purification chamber in sequence, and the medium supplement frame seals the upper and lower openings of the purification chamber to make the purification chamber in a closed state; The medium supplement frame injects the promoting medium into the closed purification chamber, so that the microorganisms on the microbial loading bed are immersed in the promoting medium.

2. The high-efficiency carbon and nitrogen supplemented biological enhanced removal device for groundwater nitrate according to claim 1, Characterized in that: The medium supplement frame includes an upper sealing plate, a first side translation component, a second side translation component and a lower sealing plate; the upper sealing plate is slidably installed on the surface of the second outer frame body, the lower sealing plate is slidably installed on the bottom surface of the second outer frame body, the first side translation component and the second side translation component are slidably placed on both sides inside the second outer frame body, the top end of the first side translation component is connected to one end of the upper sealing plate, and the bottom end is connected to one end of the lower sealing plate; the top end of the second side translation component is connected to the other end of the upper sealing plate, and the bottom end is connected to the other end of the lower sealing plate; the side part of the first side translation component is communicated with the medium supply component; The upper sealing plate is used to seal the top opening of the purification chamber, and the lower sealing plate is used to seal the bottom opening of the purification chamber.

3. The high-efficiency carbon and nitrogen supplemented biological enhanced removal device for groundwater nitrate according to claim 2, Characterized in that: The structures of the first side translation component and the second side translation component are the same; the first side translation component includes a vertical plate, a horizontal plate, a moving seat and a driving screw; the top end of the vertical plate is connected to the end of the upper sealing plate, and the bottom end is connected to the end of the lower sealing plate. A horizontal plate is vertically arranged in the middle of the side wall of the vertical plate. A moving seat is arranged at the outer end of the horizontal plate. The moving seat is slidably attached to the outer wall of the second outer frame body, and a driving screw is threaded through the inside of the moving seat.

4. The high-efficiency carbon and nitrogen supplemented biological enhanced removal device for groundwater nitrate according to claim 3, Characterized in that: Inside the upper sealing plate, a first pipe body is installed. The first external connecting pipe sequentially passes through the moving seat, the horizontal plate, and the vertical plate, and its end is communicated with the first pipe body. The other end of the first external connecting pipe, which is away from the first pipe body, is communicated with the medium supply assembly; the first pipe body is used to output the promoting medium to the purification chamber in a closed state; Inside the lower sealing plate, a second pipe body is installed. The second external connecting pipe sequentially passes through the moving seat, the horizontal plate, and the vertical plate, and its end is communicated with the first pipe body. The other end of the second external connecting pipe, which is away from the second pipe body, is communicated with the waste liquid tank; the second external connecting pipe is used to pump out the waste liquid in the purification chamber in a closed state to the external waste liquid tank.

5. The high-efficiency carbon and nitrogen supplemented biological enhanced removal device for groundwater nitrate according to claim 4, characterized in that: On the bottom surface of the lower sealing plate, a scraping plate is provided for scraping the dirt on the surface of the upper net plate.

6. The high-efficiency carbon and nitrogen supplemented biological enhanced removal device for groundwater nitrate according to claim 5, characterized in that: An ultrasonic generator is built in the lower sealing plate, and the ultrasonic generator is used to generate ultrasonic waves to clean the impurities in the microbial load bed.

7. The high-efficiency carbon and nitrogen supplemented biological enhanced removal device for groundwater nitrate according to claim 6, characterized in that: Inside the first outer frame body, a plurality of stirring assemblies are provided. Each stirring assembly includes stirring rods distributed in a linear array. The top end of the stirring rod is rotatably connected to the inner wall of the upper net plate, and the bottom end rotatably penetrates through the lower net plate. A driven gear is provided at the bottom end of the stirring rod; On the top surface of the upper sealing plate, a linkage plate is arranged opposite to the stirring assembly. The linkage plate includes a side plate body, and a tooth groove matched with the driven gear is opened on the inner wall of the side plate body; the linkage plate is meshed and connected with the driven gear; When the second outer frame body translates, the side plate body drives the driven gear in meshing contact with it to rotate, so as to drive the stirring rod to stir and clean the impurities in the filter packing.

8. The high-efficiency carbon and nitrogen supplemented biological enhanced removal device for groundwater nitrate according to claim 7, characterized in that: The linkage plate further includes a liquid guide plate. The side plate body and the liquid guide plate are integrally connected in an L shape. Liquid guide holes are opened on the surface of the liquid guide plate and are distributed opposite to the stirring assembly. A third pipe body is installed inside the upper sealing plate, and the third pipe body is communicated with each liquid guide hole. The third pipe body and the first pipe body are connected in parallel to the first external connecting pipe through a three-way valve; An elastic joint is provided at the bottom of the driven gear. The stirring rod is of a hollow structure, and a liquid discharge hole is opened on the bottom surface of the stirring part of the stirring rod; when the elastic joint is inserted into the liquid guide hole below it in a matching manner, the flushing water input by the first external connecting pipe sequentially passes through the third pipe body, the liquid guide hole, and the elastic joint and is discharged to the stirring rod to directly flush the filter packing.

9. A high-efficiency carbon and nitrogen supplemented biological enhanced removal method for groundwater nitrate, characterized in that: Applying the biological enhanced removal device described in claim 8 above; the biological enhanced removal method includes the following steps: S1. Groundwater purification: Groundwater enters the filter chamber from the liquid inlet chamber; The groundwater sequentially passes through the packing chamber and the microbial chamber. The filter packing absorbs the impurities in the groundwater, and the microbial load bed in the microbial chamber adsorbs and processes the nitrate in the groundwater; The treated groundwater is discharged through the liquid outlet chamber; S2. Timed promoting medium supplementation: S2.

1. The second outer casing moves to above a purification chamber, and the upper sealing plate and the lower sealing plate seal the purification chamber, while other purification chambers maintain purified water flow, and the biological enhanced removal device keeps working; S2.

2. The packing bin and the medium supplement frame are backwashed; S2.

3. The ultrasonic generator on the lower sealing plate works, and the ultrasonic waves emitted by the ultrasonic generator are dispersed in the closed state to shake off the attachments on the microbial load bed, and the shaken-off attachments remain in the liquid in the purification chamber in the closed state; S2.

4. The liquid extraction pump on the waste liquid tank works, and the liquid in the closed state is extracted under negative pressure to the second pipe body, and then discharged to the waste liquid tank through the second external connection pipe until the liquid in the purification chamber in the closed state is evacuated; S2.

5. The medium supply assembly inputs the promoting medium to the first external connection pipe, and then the promoting medium is discharged into the purification chamber in the closed state through the first pipe body of the upper sealing plate; the microorganisms on the microbial load bed are infiltrated in the promoting medium, enabling the microorganisms to fully absorb carbon sources and nitrogen sources; S3. The medium supply continues to move to the next purification chamber, and S2.1 - S2.5 are repeated until all the purification chambers are replenished with the promoting medium.

10. The method for biologically enhanced removal of nitrate from groundwater with high - efficiency carbon and nitrogen supplementation according to claim 9, characterized in that: In S2.1, when the second outer casing moves to above the purification chamber, the following actions are also synchronously performed: The tooth grooves of the side plate body are successively engaged with the driven gears at the bottom ends of the stirring rods, thereby driving the stirring rods to rotate to stir the filter packing in the packing bin, so that the attachments on the outer wall of the filter packing fall off; The scraper gradually cleans the dirt attached to the upper net plate; When the second outer casing completely seals the purification chamber, the elastic joint is snapped into the liquid guide hole in the liquid guide plate.

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