A biobattery coupled artificial wetland and water treatment method

Abstract

The present invention discloses a bio-battery coupled artificial wetland, which relates to the technical field of artificial wetlands and includes a lower filler area arranged above a water distribution pipe; an upper filler area arranged on the upper side of the lower filler area; and a biofilm frame arranged on the upper side of the upper filler area. The bio-battery coupled artificial wetland of the present invention has a simple structure and a good water treatment effect. The present invention discloses a water treatment method of a bio-battery coupled artificial wetland, which firstly treats and acclimates the sludge through a filtering and cleaning device, and then adds the sludge near the rare earth-reinforced biofilm electrode of the upper filler, and introduces sewage to operate the artificial wetland to treat the water. The present invention enhances the denitrification performance of the artificial wetland by coupling the bio-battery to the artificial wetland, mainly enhancing the nitrate nitrogen reduction effect.

Description

Technical Field

[0001] The present invention relates to the technical field of artificial wetlands, and more particularly to a bio-battery coupled artificial wetland and a water treatment method. Background Art

[0002] my country is short of water resources. With the rapid development of the economy, the amount of wastewater generated is increasing, and the amount of tail water discharged after secondary treatment of sewage treatment plants is also gradually increasing. How to make use of this part of water resources is one of the effective ways to solve the current shortage of water resources in my country. At the same time, the eutrophication problem of lakes in my country is still serious. It is very necessary to reduce nitrogen and phosphorus pollutants in rivers entering the lake. Therefore, it is very necessary to study how to economically and effectively purify sewage treatment plant tail water so that it can be discharged more safely or even reused. Artificial wetland deep treatment of sewage treatment plant tail water has the advantages of low investment, low cost and resource utilization. It has comprehensive economic and ecological benefits and is an economically feasible deep treatment technology. However, due to its structural characteristics, operation mode and purification path and other factors, artificial wetlands have unstable denitrification and phosphorus removal capabilities in actual applications.

[0003] In order to solve the above problems, a rare earth enhanced biofilm electrode coupled artificial wetland and water treatment method is disclosed in the Chinese invention patent with application number: CN202210990294.1. In step S1, sludge is collected from the anoxic tank of the sewage treatment plant, the impurities therein are filtered with a stainless steel filter, and washed three times with deionized water. Then, it is anaerobically cultured for one week, nutrient solution is added regularly, and the sludge is stirred regularly to maintain the activity of the sludge until the sludge is acclimated. Although the biobattery coupled artificial wetland water treatment method can acclimate the activity of the sludge, the water treatment method does not filter the sludge sufficiently, and the sludge is often accumulated thickly when filtered, which is not convenient for filtration.

[0004] Therefore, it is necessary to propose a biobattery coupled with artificial wetland and water treatment method to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the existing water treatment method is insufficient when filtering sludge, and the sludge is often accumulated thickly when filtering, which is inconvenient for filtering and cleaning. The present invention provides a bio-battery coupled artificial wetland and water treatment method.

[0006] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0007] A bio-battery coupled artificial wetland includes a wetland body, purification plants planted in the wetland, a water distribution pipe arranged at the bottom of the wetland body, and an external power supply, and is characterized by:

[0008] Also includes:

[0009] The lower filler area is provided above the water distribution pipe to support the filler layer;

[0010] An upper packing area is provided on the upper side of the lower packing area;

[0011] The biofilm frame arranged on the upper side of the upper filler area is used to hang the rare earth-reinforced biofilm electrode, so that the attached biofilm provides a larger attachment area and growth environment for microorganisms performing heterotrophic denitrification and autotrophic denitrification.

[0012] A bio-battery coupled artificial wetland water treatment method, comprising the above-mentioned bio-battery coupled artificial wetland,

[0013] Step S1. Sludge is collected from an anoxic tank at a sewage treatment plant, impurities are filtered using a filter-cleaning device, and the filtered sludge is washed three times with deionized water. The washed sludge is then transferred to an anaerobic environment and cultured for one week. Nutrient solution is regularly added and stirred to maintain sludge activity until sludge acclimation is complete.

[0014] Step S2. Add the acclimated activated sludge to the upper layer of the wetland near the rare earth-enhanced biofilm electrode. Start the constructed wetland inlet pump and pass the sewage into the water distribution pipe. Continue to operate in the constructed wetland. The sewage covers the biofilm electrode and forms a biofilm. Regularly monitor the pollutant concentration in the test device's effluent until the biofilm on the biofilm electrode is successfully acclimated and the device is operating stably.

[0015] Step S3. Turn on the power supply and control the voltage value to 12-17V, the power-on time to 2-6 hours, adjust the biofilm electrode spacing to 80mm-120mm, the hydraulic retention time to 8-12 hours, the ambient temperature to 25 to 30°C, and purify the sewage through the artificial wetland.

[0016] Furthermore, the filtering and cleaning device includes multiple screening devices that can swing back and forth in the horizontal direction and are used to spread and filter the sludge, a flushing device for flushing the sludge with deionized water, and a collecting device for collecting the deionized water after cleaning. The multiple screening devices are driven to slide separately by the same driving device.

[0017] Furthermore, the screening device includes a placement frame that is slidably arranged in the working box along the horizontal direction, and the two ends of the placement frame are fixedly connected with limit plates for placing the stainless steel screen. The placement frame at the lower end of the stainless steel screen is provided with a rectangular through groove for slidingly connecting the plug plate along the horizontal direction, and the two ends of the working box are provided with limit components for temporarily fixing the plug plate in the rectangular through groove. The placement frames at the upper and lower ends of the rectangular through groove are respectively set to be the first screen and the second screen for discharging deionized water.

[0018] Furthermore, a recessed rack is provided on the front side of the placement frame, and a plurality of assembly grooves on the front side of the working box are provided in the same horizontal plane as the recessed rack. A gear assembly for driving the placement frame to move is provided in the assembly groove, and the gear assembly is driven to rotate by a driving device.

[0019] Furthermore, the gear assembly includes a mounting plate rotatably connected to both ends of the hollow shaft and a gear fixedly connected to the middle of the hollow shaft. The hollow shaft is arranged in a vertical direction, and the mounting plate is fixedly connected to the working box at the upper and lower ends of the assembly slot. The gear passes through the assembly slot and is meshed with the recessed rack. The driving device is used to drive the hollow shaft to rotate.

[0020] Furthermore, an installation gap is provided between every two adjacent gear assemblies, the driving device includes a rotating shaft and a motor connected to the industrial computer for communication, the motor is fixedly connected to the working box, the rotating shaft is fixedly connected to the output shaft of the motor, the rotating shaft and the hollow shaft are coaxial, and the inner diameter of the hollow shaft is larger than the outer diameter of the rotating shaft, and a connecting mechanism that can be temporarily fixed to one of the hollow shafts individually is slidably provided on the rotating shaft located in the installation gap.

[0021] Furthermore, the connecting mechanism includes a connecting sleeve fixedly connected to the end of the hollow shaft, a second cylinder fixedly connected to the working box and communicatively connected to the industrial computer, a connecting plate fixedly connected to the output end of the second cylinder, a sliding plate rotatably connected to the end of the connecting plate away from the second cylinder, and a plug-in sleeve fixedly connected to the upper end of the sliding plate, the outer side surface of the plug-in sleeve and the inner side surface of the connecting sleeve are first polygonal surfaces of the same shape and size, the outer side surface of the hollow shaft and the inner side surface of the plug-in sleeve are second polygonal surfaces of the same shape and size, and the plug-in sleeve is slidably connected to the outer side surface of the hollow shaft.

[0022] Furthermore, the flushing device includes a mounting rod symmetrically slidably arranged on the upper end of the working box on both sides of the gear in the vertical direction, the upper end of the working box is symmetrically fixedly connected to a multi-section electric telescopic rod that is communicatively connected to the industrial computer and is used to drive the mounting rod to slide, the lower end of the mounting rod is fixedly connected to a long strip nozzle, the water inlet of the long strip nozzle is connected to a connecting pipe, and the other end of the connecting pipe is fixedly connected to the water outlet of the high-pressure deionized water tank.

[0023] Furthermore, a downwardly inclined guide plate is fixedly connected to the lower end of the second screen, a space for deionized water to flow out is formed between the guide plate and the first screen, and the collecting device is arranged on the downwardly inclined side of the guide plate.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The biobattery coupled with artificial wetland provided by the present invention has a simple structure and good water treatment effect.

[0026] 2. In the water treatment method of the present invention, the denitrification performance of the artificial wetland is enhanced by coupling the biobattery with the artificial wetland, mainly the nitrate nitrogen reduction effect is enhanced.

[0027] 3. The present invention is capable of performing layered treatment on the sludge by providing a filtering and cleaning device, so that the sludge is spread out into a thin layer, thereby achieving better filtering and cleaning effects on the sludge, and also accelerating the cleaning efficiency of the sludge.

[0028] 4. The present invention can spread and filter the sludge by providing a screening device, and can prevent sludge from being blocked by the driving device.

[0029] 5. The present invention can clean the sludge on each layer of the placement frame separately through the coordination between the motor, the rotating shaft and the connecting mechanism, and can also reciprocate the sludge on multiple layers of placement frames at the same time, so that the untreated sludge is filtered through the stainless steel screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the overall structure of the artificial wetland provided by the present invention;

[0031] Figure 2 It is a three-dimensional front view schematic diagram of the filtering and cleaning device of the present invention;

[0032] Figure 3 It is a bottom-up perspective schematic diagram of the filtering and cleaning device of the present invention;

[0033] Figure 4 It is a front plan view schematic diagram of the connection structure at the placement frame of the present invention;

[0034] Figure 5 For the present invention Figure 4 A schematic plan view of the connecting structure;

[0035] Figure 6 It is a three-dimensional schematic diagram of the connection structure at the placement frame of the present invention;

[0036] Figure 7 For the present invention Figure 2 A in the middle is an enlarged schematic diagram;

[0037] Figure 8 For the present invention Figure 5 Enlarged schematic diagram of point B in the middle.

[0038] Figure numerals: 1, working box; 2, multi-section electric telescopic rod; 3, mounting rod; 4, long strip nozzle; 5, connecting pipe; 6, high-pressure deionized water tank; 7, placement frame; 8, limit plate; 9, stainless steel screen; 10, recessed rack; 11, plug plate; 12, guide plate; 13, first cylinder; 14, limit rod; 15, assembly groove; 16, mounting plate; 17, hollow shaft; 18, gear; 19, connecting sleeve; 20, mounting block; 21, second cylinder; 22, connecting plate; 23, sliding plate; 24, plug sleeve; 25, fillet; 26, rotation Shaft; 27, motor; 28, support rod; 29, guide rail; 30, positioning plate; 31, collection box; 32, water receiving frame; 33, guide plate; 34, third cylinder; 35, plug-in plate; 36, support member; 37, plug-in slot; 38, universal wheel; 39, splash guard; 40, first screen; 41, second screen; 100, wetland body; 200, purification plant; 300, water distribution pipe; 400, power supply; 500, lower filling area; 600, upper filling area; 700, biofilm frame; 800, biofilm electrode; 900, water outlet. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] See also Figure 1 A bio-battery coupled artificial wetland includes a wetland body 100, purification plants 200 planted in the wetland body 100, a water distribution pipe 300 provided at the bottom of the wetland body 100, and an external power supply 400.

[0041] Also includes:

[0042] A lower filler area 500 is provided above the water distribution pipe 300 for supporting the filler layer;

[0043] An upper filling area 600 is provided on the upper side of the lower filling area 500;

[0044] The biofilm frame 700 is arranged on the upper side of the upper filling area 600, and a water outlet 900 is provided above the upper filling area 600 for hanging the rare earth reinforced biofilm electrode 800, so as to provide a larger attachment area and growth environment for microorganisms performing heterotrophic denitrification and autotrophic denitrification.

[0045] A bio-battery coupled artificial wetland water treatment method, comprising the above-mentioned bio-battery coupled artificial wetland,

[0046] Step S1. Sludge is collected from an anoxic tank at a sewage treatment plant, impurities are filtered using a filter-cleaning device, and the filtered sludge is washed three times with deionized water. The washed sludge is then transferred to an anaerobic environment and cultured for one week. Nutrient solution is regularly added and stirred to maintain sludge activity until sludge acclimation is complete.

[0047] Step S2. Add the acclimated activated sludge to the upper layer of the wetland near the rare earth-enhanced biofilm electrode 800, start the constructed wetland inlet pump, pump the sewage into the water distribution pipe 300, and continue to operate in the constructed wetland. The sewage covers the biofilm electrode 800 and forms a biofilm. The pollutant concentration in the water outlet of the test device is regularly tested until the biofilm on the biofilm electrode 800 is successfully acclimated and the device is operating stably.

[0048] Step S3. Turn on the power supply and control the voltage value to 12-17V, the power-on time to 2-6 hours, adjust the spacing of the biofilm electrodes 800 to 80mm-120mm, the hydraulic retention time to 8-12 hours, the ambient temperature to 25 to 30°C, and purify the sewage through the artificial wetland.

[0049] Regarding the above-mentioned biobattery coupled artificial wetland and water treatment method, reference is made to the Chinese invention patent application number CN202210990294.1, which discloses a rare earth enhanced biofilm electrode coupled artificial wetland and water treatment method. The difference lies in the different treatment method for sludge in step S1 of the biobattery coupled artificial wetland water treatment method. The use of the cleaning step in the present invention can make the sludge cleaning more thorough, as described below.

[0050] Specifically, combined with Figure 2-6 As shown, the filtering and cleaning device includes a plurality of screening devices that can swing back and forth in the horizontal direction and are used to spread and filter the sludge, a flushing device for flushing the sludge with deionized water, and a collecting device for collecting the deionized water after cleaning. The plurality of screening devices are driven to slide respectively by the same driving device, wherein the screening device, the flushing device and the collecting device are all connected to the industrial computer for communication. For the convenience of control, the left side of the working box 1 is the area for adding sludge, and the right side of the working box 1 is the area for installing the collecting device. Support rods (28) are provided on both sides of the working box 1 to better prevent the working box 1 from tilting.

[0051] Specifically, combined with Figure 2-6As shown, the screening device includes a placement frame 7 that is slidably arranged in the working box 1 in the horizontal direction, and a limit plate 8 for placing a stainless steel screen 9 is fixedly connected to both ends of the placement frame 7. The stainless steel screen 9 is a square frame, and a handle is provided at the upper end of the square frame for taking the stainless steel screen 9 out of the placement frame 7. The placement frame 7 at the lower end of the stainless steel screen 9 is provided with a rectangular through groove for slidingly connecting the plug plate 11 in the horizontal direction, and a limit assembly is provided at both ends of the working box 1 for temporarily fixing the plug plate 11 in the rectangular through groove, so that To avoid the limiting component being temporarily fixed in the rectangular through groove when the driving device drives the screening device to slide, thereby preventing the driving device from moving in the rectangular through groove when the screening device drives the screening device to slide, the placement frames 7 at the upper and lower ends of the rectangular through groove are respectively set to the first screen 40 and the second screen 41 for deionized water to be discharged, thereby preventing water from leaking from the first screen 40 and the second screen 41 when the sludge is cleaned. The first screen 40 and the second screen 41 are selected as screens that can only pass deionized water to prevent sludge from flowing out of the screens.

[0052] Specifically, combined with Figure 2-6 As shown, a recessed rack 10 is provided on the front side of the placement frame 7 to save installation space, and a plurality of assembly grooves 15 are provided on the front side of the work box 1 which are in the same horizontal plane as the recessed rack 10. A gear assembly for driving the placement frame 7 to move is provided in the assembly groove 15, and both ends of the recessed rack 10 are at a certain distance from both ends of the placement frame 7 to prevent the placement frame 7 from leaving the work box 1, providing a position limit for the gear assembly, and the gear assembly is driven to rotate by the driving device so that the placement frame 7 can be driven to swing back and forth under the control of the industrial computer.

[0053] Specifically, combined with Figure 2-6 As shown, the gear assembly includes a mounting plate 16 rotatably connected to both ends of the hollow shaft 17 and a gear 18 fixedly connected to the middle of the hollow shaft 17. The hollow shaft 17 is arranged in a vertical direction, and the mounting plate 16 is fixedly connected to the working box 1 at the upper and lower ends of the assembly slot 15. The gear 18 passes through the assembly slot 15 and is meshed with the recessed rack 10. The driving device is used to drive the hollow shaft 17 to rotate. When the gear 18 drives the placement frame 7 to move to the leftmost end or the rightmost end, the setting of the limit plate 8 can avoid the situation where the cleaning device cannot clean this part of the sludge when the gear 18 drives the placement frame 7 to slide to one side.

[0054] Specifically, combined with Figure 2 , Attachment Figure 3 and attached Figure 7As shown, an installation gap is set between every two adjacent gear assemblies. The driving device includes a rotating shaft 26 and a motor 27 connected to the industrial computer. The motor 27 is fixedly connected to the work box 1, and the rotating shaft 26 is fixedly connected to the output shaft of the motor 27. The rotating shaft 26 and the hollow shaft 17 are coaxial, and the inner diameter of the hollow shaft 17 is larger than the outer diameter of the rotating shaft 26. A connecting mechanism capable of temporarily fixing to a single hollow shaft 17 is slidably provided on the rotating shaft 26 located in the installation gap.

[0055] There are two ways to set up the connection mechanism. The first one (not shown in the drawings) is to slide a set of connection mechanisms on the rotating shaft 26 of each installation gap. The second one is based on the attached Figure 2 , Attachment Figure 3 and attached Figure 6 As shown, the rotating shaft 26 is assumed to be a group with two gears 18 from top to bottom. Two sets of connecting mechanisms are slidingly set on the rotating shaft 26 in the installation gap in each group. The sliding directions of the two sets of connecting mechanisms are opposite to those of the hollow shaft 17 when temporarily fixed.

[0056] Specifically, combined with Figure 7 As shown, the connecting mechanism includes a connecting sleeve 19 fixedly connected to the end of the hollow shaft 17, a second cylinder 21 fixedly connected to the working box 1 and connected to the industrial computer for communication, a connecting plate 22 fixedly connected to the output end of the second cylinder 21, a sliding plate 23 rotatably connected to the connecting plate 22 away from the end of the second cylinder 21 and a plug sleeve 24 fixedly connected to the upper end of the sliding plate 23, the fixed end of the second cylinder 21 is fixed to the mounting block 20, the mounting block 20 is fixed to the working box 1, the outer side surface of the plug sleeve 24 and the inner side surface of the connecting sleeve 19 are shaped The outer side of the hollow shaft 17 and the inner side of the plug sleeve 24 are second multi-faceted surfaces of the same shape and size. The plug sleeve 24 is slidably connected to the outer side of the hollow shaft 17. In order to facilitate the plug-in sleeve 24 to be plugged into the connecting sleeve 19, one end of the plug sleeve 24 inserted into the connecting sleeve 19 is set to a rounded corner. The motor 27 selects a servo motor. By setting the number of revolutions of the servo motor, the servo motor is always in a state where, after a certain number of revolutions, the outer side of the plug sleeve 24 can always be parallel to the inner side of the connecting sleeve 19.

[0057] Specifically, combined with Figure 2 and attached Figure 3As shown, the flushing device includes a mounting rod 3 symmetrically slidingly arranged on the upper end of the working box 1 on both sides of the gear 18 in the vertical direction, the upper end of the working box 1 is symmetrically fixedly connected with a multi-section electric telescopic rod 2 which is connected to the industrial computer for communication and is used to drive the mounting rod 3 to slide, and the lower end of the mounting rod 3 is fixedly connected with a long strip nozzle 4. The length of the long strip nozzle 4 is consistent with the width of the stainless steel screen 9, so that the long strip nozzle 4 can be evenly placed on the frame 7 and sprayed on the sludge to clean the sludge. The water inlet of the long strip nozzle 4 The outlet is connected to a connecting pipe 5, the other end of the connecting pipe 5 is fixedly connected to the water outlet of the high-pressure deionized water tank 6, and by arranging the elongated nozzle 4 on both sides of the working box 1 and the setting of the limit plate 8, when the motor 27 drives the gear 18 to drive the placement frame 7 to move to one end, for example, when it moves to the leftmost end, the gear 18 is located at the right end of the recessed rack 10, and the elongated nozzle 4 at the right end is just located at the limit plate 8 on the right side of the placement frame 7, thereby facilitating the cleaning of the filtered sludge in the placement frame 7.

[0058] Specifically, combined with Figure 3-6 As shown, in order to facilitate the collection of deionized water after cleaning the sludge, a downward-inclined guide plate 12 is fixedly connected to the lower end of the second screen 41, so that a space for the deionized water to flow out is formed between the guide plate 12 and the first screen 40, and then the collecting device is arranged on the downward-inclined side of the guide plate 12. Preferably, the collecting device is arranged on the side opposite to the sludge loading. For example, when the motor 27 drives the placement frame 7 to rotate to the leftmost end, the unfiltered sludge is loaded on the stainless steel screen 9, then the collecting device is arranged at the right end of the working box 1 without affecting the loading of the sludge.

[0059] Specifically, combined with Figure 2 and attached Figure 3As shown, the collecting device includes a collecting box 31 and a guide rail 29 for guiding the collecting box 31. The guide rail 29 is fixedly connected to the working box 1 on the side where the guide plate 12 is tilted downward. The lower end of the collecting box 31 is fixedly connected to a plurality of universal wheels 38. Two guide plates 33 are fixedly connected just below the working box 1. The distance between the two guide plates 33 is consistent with the width of the guide rail 29. A positioning plate 30 is fixedly connected to the guide rail 29. A plug-in slot 37 is provided on the guide rail 29 on the side where the positioning plate 30 is away from the working box 1. A plug-in slot 37 is also provided on the guide plate 33. A plug-in plate 35 is plugged into the plug-in slot 37. Support members 36 for supporting the plug-in plate 35 are provided on both sides of the connecting plate 35. The space between the support members 36 on both sides forms a space for the plug-in plate 35 to slide. The plug-in plate 35 is driven to slide by the third cylinder 34. The third cylinder 34 is fixedly connected to the lower end of the working box 1. The working box 1 is provided with a plurality of water receiving frames 32 at one end facing the working box 1. The water receiving frames 32 can be plugged into the outside of the guide plate 12 to prevent deionized water from flowing out. When the collecting box 31 slides along the guide rail 29 to fit the positioning plate 30, the plug-in plate 35 corresponds to the plug-in groove 37 on the guide rail 29. At this time, the water receiving frame 32 is just inserted into the outside of the guide plate 12.

[0060] Specifically, combined with Figure 2 and attached Figure 3 As shown, the limiting assembly includes a first cylinder 13 and a limiting rod 14. The first cylinder 13 is fixedly connected to the two ends of the placement frame 7. The limiting rod 14 is an inverted L-shaped rod. One end of the L-shaped rod is fixedly connected to the output end of the first cylinder 13, and the other end of the L-shaped rod is in contact with the side of the placement frame 7. When the first cylinder 13 is extended, the L-shaped rod moves upward, and the insert plate 11 can be pulled out at this time. When the first cylinder 13 contracts to the limit state, the L-shaped rod moves downward. At this time, the insert plate 11 inserted between the first screen 40 and the second screen 41 can be temporarily fixed to the placement frame 7.

[0061] Working principle: First, place the frame 7 according to the attached Figure 2 The setting method is set in (the position of the placement frame 7 is the initial position at this time), and the connection mechanism is set according to the first method, wherein the placement frame 7 has four groups, which are named as the first layer, the second layer, the third layer and the fourth layer in order from top to bottom. When cleaning the sludge, it is divided into the following steps;

[0062] Step 1: First, the second cylinder 21 of the first layer is controlled by the industrial computer to extend, and the plug sleeve 24 is inserted into the connecting sleeve 19 of the first layer, so that the position between the rotating shaft 26 and the hollow shaft 17 is relatively fixed. Then, the motor 27 is controlled by the industrial computer to rotate a certain number of circles, so that the rotating shaft 26 drives the motor 27 to rotate, and then the gear 18 drives the placement frame 7 to slide to the left to the rightmost end, and then the unwashed sludge is poured onto the stainless steel screen 9. Then, the second cylinders 21 of the second, third, and fourth layers are controlled to extend in sequence, so that the placement frames 7 of the second, third, and fourth layers slide to the left in sequence to receive the sludge. After receiving the sludge, they are all moved to the right end of the working box 1.

[0063] Step 2: Then, the industrial computer controls the second cylinders 21 of the first, second, third and fourth layers to extend to their limit state, so that when the motor 27 drives the rotating shaft 26 to rotate, it can simultaneously drive the four sets of gears 18 to rotate, thereby driving the four sets of placement frames 7 to slide to the left at the same time. The industrial computer controls the forward and reverse rotation of the motor 27, so that the placement frames 7 reciprocate to the left in the horizontal direction, thereby causing the stainless steel screen 9 to filter the sludge. Under the action of the splash plate 39, the sludge is prevented from flowing out of the stainless steel screen 9 during the reciprocating motion.

[0064] Step 3: After the sludge screening is completed, the stainless steel screen 9 is removed from the placement frame 7, and the impurities screened out of the stainless steel screen 9 are collected. When the space between the two placement frames 7 is not enough to take out the stainless steel screen 9, according to the steps of the first step, the first, second, third and fourth layer placement frames 7 are moved to the leftmost end in turn by the industrial computer to take out the stainless steel screen 9;

[0065] Step 4: After the stainless steel screen 9 is taken out, the filtered sludge is stored in the placement frame 7. The sludge in the placement frame 7 is cleaned in the order of the first layer, the second layer, the third layer and the fourth layer. When the sludge in the first layer of the placement frame 7 is cleaned, the industrial computer first connects the connection mechanism of the first layer with the first layer, starts the booster pumps in the two high-pressure deionized water tanks 6 and the rotation of the motor 27, so that the high-pressure deionized water tank 6 will pass the deionized water into the long strip nozzle 4 through the connecting pipe 5, and then the long strip nozzle is cleaned. 4 Deionized water is sprayed onto the sludge in the placing frame 7, and at the same time, the industrial computer controls the motor 27 to rotate forward and reverse for a certain number of times, so that the deionized water evenly cleans the sludge. After a certain period of cleaning, the industrial computer controls the first cylinder 13 to extend, and then the industrial computer controls the motor 27 to rotate, so that the placing frame 7 moves to the rightmost end of the working box 1, and then the guide plate 12 is inserted into the water receiving frame 32, and then the operator pulls the insert plate 11 and pulls the insert plate 11 out from between the first screen 40 and the second screen 41, so that the cleaned sludge is The deionized water of the sludge flows from the first screen 40 and the second screen 41 to the guide plate 12, and then flows along the guide plate 12 to the water receiving frame 32, and then is collected in the collection box 31. Then, the second layer of sludge is cleaned. First, the industrial computer contracts the second cylinder 21 of the first layer and extends the second cylinder 21 of the second layer. Unlike the cleaning of the first layer of sludge, the industrial computer only turns on the booster pump in the left high-pressure deionized water tank 6. At the same time, the industrial computer also controls the contraction of the multi-section electric telescopic rod 2 on the left. A certain height enables the elongated nozzle 4 to be closer to the sludge, so that the deionized water sprayed by the elongated nozzle 4 can clean the sludge more thoroughly. Then, the second layer is cleaned according to the steps for cleaning the first layer of sludge. When cleaning the third layer of sludge, the industrial computer retracts the second cylinders 21 of the first and second layers and controls the second cylinder 21 of the third layer to extend. Similarly, the industrial computer controls the multi-section electric telescopic rod 2 on the left to retract a certain height. When cleaning the subsequent layers of sludge, this rule is followed and so on.

[0066] After each of the above steps is completed, the industrial computer controls the second cylinder 21 to contract, so that the connection mechanism and the hollow shaft 17 are not fixed;

[0067] When positioning the collection box 31, first make the guide plate 33 fit the side of the guide rail 29, and then push the collection box 31 to slide along the guide rail 29. When the collection box 31 fits the positioning plate 30, the operator controls the extension of the third cylinder 34 through the industrial computer, and inserts the plug-in plate 35 into the plug-in slot 37 to complete the fixation of the collection box 31.

[0068] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention should also be included in the scope of protection of the present invention.

Claims

1. A biobattery coupled artificial wetland water treatment method, characterized by: It includes a wetland body, purification plants planted in the wetland body, a water distribution pipe arranged at the bottom of the wetland body, and an external power supply; Also includes: The lower filler area is provided above the water distribution pipe to support the filler layer; An upper packing area is provided on the upper side of the lower packing area; The biofilm frame is arranged on the upper side of the upper filler area to be used for hanging rare earth enhanced biofilm electrodes, thereby providing a larger attachment area and growth environment for microorganisms performing heterotrophic denitrification and autotrophic denitrification. The bio-battery coupled artificial wetland water treatment method comprises the following steps: Step S1. Sludge is collected from an anoxic tank at a sewage treatment plant, impurities are filtered using a filter-cleaning device, and the filtered sludge is washed three times with deionized water. The washed sludge is then transferred to an anaerobic environment and cultured for one week. Nutrient solution is regularly added and stirred to maintain sludge activity until sludge acclimation is complete. Step S2. Add the acclimated activated sludge to the upper layer of the wetland near the rare earth-enhanced biofilm electrode. Start the constructed wetland inlet pump and pass the sewage into the water distribution pipe. Continue to operate in the constructed wetland. The sewage covers the biofilm electrode and forms a biofilm. Regularly monitor the pollutant concentration in the test device's effluent until the biofilm on the biofilm electrode is successfully acclimated and the device is operating stably. Step S3. Turn on the power supply and control the voltage to 12-17V, the power-on time to 2-6 hours, adjust the biofilm electrode spacing to 80mm-120mm, the hydraulic retention time to 8-12 hours, and the ambient temperature to 25 to 30°C, and purify the sewage through the artificial wetland; The filtering and cleaning device includes a plurality of screening devices that can swing back and forth in the horizontal direction and are used to spread and filter the sludge, a washing device for washing the sludge with deionized water, and a collecting device for collecting the washed deionized water. The plurality of screening devices are driven to slide respectively by the same driving device; The screening device includes a placement frame that is slidably arranged in a working box in a horizontal direction, and a limiting plate for placing a stainless steel screen is fixedly connected to both ends of the placement frame. The placement frame at the lower end of the stainless steel screen is provided with a rectangular through groove for slidingly connecting a plug plate in the horizontal direction. Limiting components for temporarily fixing the plug plate in the rectangular through groove are provided at both ends of the working box, and the placement frames at the upper and lower ends of the rectangular through groove are respectively set to be the first screen and the second screen for discharging deionized water.

2. The biobattery-coupled artificial wetland water treatment method according to claim 1, characterized in that: The front side of the placement frame is provided with a recessed rack, and the front side of the working box is provided with a plurality of assembly grooves which are in the same horizontal plane as the recessed rack. A gear assembly for driving the placement frame to move is provided in the assembly groove, and the gear assembly is driven to rotate by a driving device.

3. The bio-battery coupled artificial wetland water treatment method according to claim 2, characterized in that: The gear assembly includes a mounting plate rotatably connected to both ends of the hollow shaft and a gear fixedly connected to the middle of the hollow shaft. The hollow shaft is arranged in a vertical direction, and the mounting plate is fixedly connected to the working box at the upper and lower ends of the assembly slot. The gear passes through the assembly slot and is meshed with the recessed rack. The driving device is used to drive the hollow shaft to rotate.

4. The bio-battery coupled artificial wetland water treatment method according to claim 3, characterized in that: An installation gap is set between every two adjacent gear assemblies. The driving device includes a rotating shaft and a motor connected to the industrial computer for communication. The motor is fixedly connected to the working box, and the rotating shaft is fixedly connected to the output shaft of the motor. The rotating shaft and the hollow shaft are coaxial, and the inner diameter of the hollow shaft is larger than the outer diameter of the rotating shaft. A connecting mechanism that can be temporarily fixed to one of the hollow shafts is slidably set on the rotating shaft located in the installation gap.

5. The bio-battery coupled artificial wetland water treatment method according to claim 4, characterized in that: The connecting mechanism includes a connecting sleeve fixedly connected to the end of the hollow shaft, a second cylinder fixedly connected to the working box and communicatively connected to the industrial computer, a connecting plate fixedly connected to the output end of the second cylinder, a sliding plate rotatably connected to the end of the connecting plate away from the second cylinder, and a plug-in sleeve fixedly connected to the upper end of the sliding plate, the outer side surface of the plug-in sleeve and the inner side surface of the connecting sleeve are first polygonal surfaces of the same shape and size, the outer side surface of the hollow shaft and the inner side surface of the plug-in sleeve are second polygonal surfaces of the same shape and size, and the plug-in sleeve is slidably connected to the outer side surface of the hollow shaft.

6. The biobattery-coupled artificial wetland water treatment method according to claim 5, characterized in that: The flushing device includes a mounting rod symmetrically slidably arranged on the upper end of a working box on both sides of the gear in a vertical direction, the upper end of the working box is symmetrically fixedly connected to a multi-section electric telescopic rod that is communicatively connected to an industrial computer and is used to drive the mounting rod to slide, the lower end of the mounting rod is fixedly connected to a long strip nozzle, the water inlet of the long strip nozzle is connected to a connecting pipe, and the other end of the connecting pipe is fixedly connected to the water outlet of the high-pressure deionized water tank.

7. The biobattery-coupled constructed wetland water treatment method according to claim 6, characterized in that: A downwardly inclined guide plate is fixedly connected to the lower end of the second screen, and a space for deionized water to flow out is formed between the guide plate and the first screen. The collecting device is arranged on the downwardly inclined side of the guide plate.

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