Microalgae-based constructed wetland coupled microbial fuel type sewage treatment device

Abstract

The application discloses a microbial fuel type sewage treatment device based on microalgae artificial wetland coupling and relates to the technical field of sewage treatment.The device comprises a treatment tank, an artificial wetland main body and a microalgae culture tank, wherein the artificial wetland main body is arranged on the bottom of the treatment tank.In the sewage treatment process, the filter screen plate blocks mature microalgae, i.e., microalgae in the stable period, and meanwhile, the driving motor drives the rotating rod to rotate, and through the connecting rod one and the connecting rod two, the pushing plate cleans and concentrates the microalgae on the filter screen plate to the middle, so as to avoid blockage, ensure the flow area and the stability of the sewage treatment, and when the microalgae are gathered, the connecting rod one cooperates with the supporting plate to drive the extruding plate to descend and merge, the microalgae are compressed into squares by the forming groove and the extruding block, the remaining area is reduced, the filtering efficiency is improved, repeated blockage is avoided, the cleaning difficulty is reduced, and subsequent collection is facilitated.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a microbial fuel-based wastewater treatment device based on microalgae-enhanced wetlands. Background Technology

[0002] China's aquaculture, pig, and sheep farming industries rank first in the world in terms of scale. While the rapid development of these industries has boosted the social economy, it has also brought about significant environmental pollution problems, such as water pollutant emissions. Pig farming wastewater is characterized by high levels of suspended solids, organic matter, and ammonia nitrogen, with chemical oxygen demand (COD) concentrations reaching as high as 13,000–17,000 mg / L. Marine aquaculture effluent is characterized by high salinity, complex pollutant composition, and poor biodegradability, making it difficult to treat and requiring advanced technology. Therefore, promoting green marine aquaculture coupled with efficient resource and energy recycling to reduce carbon emissions during the aquaculture process, while simultaneously establishing a comprehensive marine carbon sink assessment standard system and screening for the optimal types of aquaculture products to increase marine carbon sequestration, can effectively contribute to environmentally friendly treatment technologies for carbon reduction.

[0003] Microbial fuel cells (MFCs) are devices that generate electricity by catalytically oxidizing organic matter using microorganisms, while constructed wetlands are engineering structures that simulate natural wetland ecosystems. The coupling system of MFCs and constructed wetlands (CWs) has attracted widespread attention as a novel eco-friendly wastewater treatment technology. This system not only improves wastewater treatment efficiency but also achieves energy recovery. Taking microalgae purification as an example, microalgae can effectively purify mariculture wastewater using biological methods and also have a strong carbon sequestration capacity. The microalgae biomass produced in this process contains a large amount of protein, carbohydrates, and lipids, which can serve as precursors for biofuel production. In practical applications, MFCs and constructed wetlands can be combined to form a highly efficient ecological treatment system. The MFC can provide the necessary electrical energy for the constructed wetland, ensuring the normal operation of the system, while the constructed wetland can utilize the electronic stimulation generated by the MFC to enhance the biological activity within the system and improve its pollutant purification capacity. This coupling system not only achieves effective wastewater purification but also reduces energy consumption, providing a new approach to environmental governance.

[0004] In existing microalgae-constructed wetland coupled wastewater treatment systems, mature microalgae need to be intercepted by filters to prevent them from flowing into the constructed wetland in order to achieve microalgae biomass energy recovery. However, during wastewater flow, mature microalgae are prone to detachment and blockage of filter pores due to reduced cell surface viscosity. This significantly increases the resistance of wastewater passing through the filter and reduces the effective flow area, which not only affects wastewater treatment efficiency but also increases the pressure difference across the filter after blockage. Some mature microalgae are "squeezed out" by the high-pressure water flow and penetrate the filter, resulting in a reduction in biomass fuel production and thus adversely affecting energy recovery. Summary of the Invention

[0005] The purpose of this invention is to provide a microbial fuel-based wastewater treatment device based on microalgae-enhanced wetlands, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a microbial fuel-type wastewater treatment device based on microalgae constructed wetlands, comprising a treatment tank, a constructed wetland body, and a microalgae cultivation tank. The constructed wetland body is disposed inside the bottom of the treatment tank. The top inner wall of the treatment tank is fixedly connected with mounting blocks at equal intervals to the microalgae cultivation tank, and the two sides of the microalgae cultivation tank are respectively fixed between two adjacent mounting blocks. Anode biomaterials are fixedly installed at equal intervals inside the constructed wetland body. A filter screen is fixedly connected to the inner wall of the microalgae cultivation tank, and cathode biomaterials are fixedly installed at equal intervals inside the microalgae cultivation tank. The bottoms of the four microalgae cultivation tanks are all connected and installed with square flow pipes, and the bottoms of the microalgae cultivation tanks are correspondingly provided with discharge holes.

[0007] The inner wall of the microalgae cultivation tank is equipped with a drainage component to clean the microalgae on the surface of the filter screen and push them to the center for aggregation during the sewage treatment process.

[0008] The inner wall of the microalgae cultivation tank is equipped with a compression and reduction component, which can divide and compress the aggregated microalgae into a square shape during the sewage treatment process.

[0009] Preferably, the unblocking and draining component includes a shaft, one end of which is rotatably connected to the inner wall of the microalgae cultivation tank, and the other end of which extends through the interior of the microalgae cultivation tank to the exterior. A drive motor is fixedly installed on one side of the outer wall of the microalgae cultivation tank corresponding to the shaft. One output shaft of the drive motor is fixed to the extended end of the microalgae cultivation tank. Push plates are symmetrically arranged on the inner wall of the microalgae cultivation tank corresponding to the filter screen. Connecting rod 1 is fixedly connected at equal intervals to the outer wall of the shaft. Connecting rod 2 is hinged to the two far ends of the two connecting rod 1. The two far ends of the two connecting rod 2 are hinged to the outer wall of the two close push plates.

[0010] Preferably, the bottoms of the two push plates are slidably connected to the top surface of the filter plate, and the bottom of the push plates is inclined. Limiting grooves are opened on both sides of the inner wall of the microalgae cultivation pool, and limiting blocks are fixedly connected to both sides of the outer wall of the two push plates. The outer wall of the limiting block is slidably connected to the inner wall of the limiting groove.

[0011] Preferably, the compression and reduction component includes a support plate. The inner walls of both sides of the microalgae culture tank are provided with grooves corresponding to the support plate. The outer walls of both ends of the support plate are slidably connected to the inner walls of the grooves. The bottom of the support plate is fixedly connected with pressing blocks at equal intervals. The bottom of the two pressing blocks is symmetrically provided with extrusion plates. The bottom of the pressing blocks is provided with merging inclined grooves corresponding to the two extrusion plates. One side of the outer wall of one of the two adjacent extrusion plates is provided with forming grooves at equal intervals. The other side of the outer wall of the two adjacent extrusion plates is fixedly connected with extrusion blocks at equal intervals. The outer wall of the extrusion blocks slides and matches the inner wall of the forming groove.

[0012] Preferably, a connecting frame is fixedly connected to the outer wall of the two adjacent extrusion plates on the side away from each other, and a support rod is fixedly connected to the outer wall of the lower pressing block on both sides corresponding to the connecting frame. The two connecting frames are provided with guide grooves through the support rods, and the outer wall of the support rod is in contact with and slides against the inner wall of the guide groove.

[0013] Preferably, anti-detachment ring caps are fixedly connected to the ends of the two support rods that are far apart, and return springs are fixedly connected to the outer walls on both sides of the lower pressure block. The ends of the two return springs that are far apart are fixedly connected to the outer walls on the side of the two connecting frames that are close together. The extrusion plate forms a telescopic structure with the return springs through the connecting frames. The end faces of the two anti-detachment ring caps that are close together are pressed against the outer walls on the side of the two connecting frames that are far apart by the return springs.

[0014] Preferably, a second reset spring is fixedly connected to the bottom of both sides of the support plate, and the bottom of the second reset spring is fixedly connected to the inner wall of the slide groove.

[0015] Preferably, one side of the outer wall of each of the four microalgae culture tanks is hinged with a side-opening door panel, and the outer wall of the treatment tank is provided with a flow hole through the main body of the artificial wetland. A collection pipe is fixedly connected to the outer wall of the treatment tank corresponding to the flow hole, and the collection pipe is spiral in shape.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. During wastewater treatment, the filter screen can block mature microalgae flowing into the constructed wetland. At the same time, the drive motor can rotate the rotating rod, so that with the cooperation of connecting rod one and connecting rod two, the two push plates move closer to each other to clean the microalgae on the surface of the filter screen and push them to the center to gather, avoiding clogging of the entire filter screen, ensuring the effective flow area of ​​the filter screen, and helping to ensure the stability of the wastewater treatment of this device.

[0018] 2. During wastewater treatment, when the microalgae on the filter screen are pushed to the center, the connecting rod and the support plate work together to drive two sets of extrusion plates to descend and insert into the accumulated microalgae. When they descend to a certain height, the two sets of extrusion plates merge. With the cooperation of the forming tank and the extrusion blocks, the accumulated microalgae can be divided and compressed into a square shape, which greatly reduces the area of ​​microalgae remaining on the filter screen and further ensures the efficiency of wastewater flow and filtration. At the same time, the compressed volume can be used to avoid repeated clogging of the filter screen holes, reduce the difficulty of cleaning the pushing plate, and facilitate the subsequent opening of the side door to collect and remove mature microalgae, which helps to ensure the stability of wastewater treatment of this device. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the treatment tank of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of the microalgae cultivation tank of the present invention;

[0022] Figure 4 This is a schematic diagram of the unblocking and drainage component of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the compression reduction component of the present invention.

[0024] In the diagram: 1. Treatment tank; 2. Main body of constructed wetland; 3. Microalgae cultivation tank; 4. Mounting block; 5. Anode biomaterial; 6. Filter plate; 9. Square flow pipe; 10. Drive motor; 11. Slide chute; 12. Discharge hole; 13. Side door panel; 14. Flow hole; 15. Collection pipe; 7. Unblocking and discharging component; 701. Shaft; 702. Push plate; 703. Connecting rod one; 704. Connecting rod two; 705. Limiting groove; 706. Limiting block; 8. Compression and reduction component; 801. Support plate; 802. Lowering block; 803. Extrusion plate; 804. Merging inclined groove; 805. Forming groove; 806. Extrusion block; 807. Connecting frame; 808. Support rod; 809. Guide groove; 810. Anti-detachment ring cap; 811. Return spring one; 812. Return spring two. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1, please refer to Figures 1-5 This invention provides a technical solution: a microbial fuel-type wastewater treatment device based on microalgae constructed wetlands, comprising a treatment tank 1, a constructed wetland body 2, and a microalgae cultivation tank 3. The constructed wetland body 2 is disposed inside the bottom of the treatment tank 1. The top inner wall of the treatment tank 1 is fixedly connected with mounting blocks 4 at equal intervals to the microalgae cultivation tank 3, and the two sides of the microalgae cultivation tank 3 are respectively fixed between two adjacent mounting blocks 4. Anode biomaterials 5 are fixedly installed at equal intervals inside the constructed wetland body 2. A filter plate 6 is fixedly connected to the inner wall of the microalgae cultivation tank 3, and cathode biomaterials are fixedly installed at equal intervals inside the microalgae cultivation tank 3. The bottoms of the four microalgae cultivation tanks 3 are all connected and installed with square flow pipes 9, and the bottoms of the microalgae cultivation tanks 3 are respectively provided with discharge holes 12.

[0027] The inner wall of the microalgae culture tank 3 is equipped with a drainage component 7;

[0028] Furthermore, the unblocking and draining component 7 includes a shaft 701, one end of which is rotatably connected to the inner wall of the microalgae culture tank 3, and the other end of which extends through the interior of the microalgae culture tank 3 to the exterior of the microalgae culture tank 3. A drive motor 10 is fixedly installed on one side of the outer wall of the microalgae culture tank 3 corresponding to the shaft 701. One end of the output shaft of the drive motor 10 is fixed to the extended end of the microalgae culture tank 3. Pushing plates 702 are symmetrically arranged on the inner wall of the microalgae culture tank 3 corresponding to the filter plate 6. Connecting rod 1 703 is fixedly connected at equal distances to the outer wall of the shaft 701. Connecting rod 2 704 is hinged to the two ends of the two connecting rod 1 703 that are far apart. The two ends of the two connecting rod 2 704 that are far apart are hinged to the outer wall of the two pushing plates 702 that are close to each other.

[0029] More specifically, in this embodiment, the constructed wetland body 2 is first set inside the bottom of the treatment tank 1, and multiple sets of vertically placed anode biomaterials 5 are arranged inside the constructed wetland body 2. Then, four microalgae cultivation tanks 3 are located at the top of the treatment tank 1, and the positions of the four microalgae cultivation tanks 3 in the treatment tank 1 are adjusted by the mounting blocks 4 on the outside. In addition, corresponding cathode biomaterials are placed in the microalgae cultivation tanks 3. The basic principle of power generation is to use the enzyme system in the microbial membrane to convert the chemical energy in the organic matter into electrical energy. Through the electron transfer between the anode and cathode, the organic matter undergoes an oxidation-reduction reaction under the action of microorganisms, thereby generating current. The more specific power generation principle is the prior art, and will not be described in detail here.

[0030] Next, the microalgae in the four microalgae cultivation tanks 3 are all at different growth levels, which can be divided into 1d, 3d, 5d, 7d, etc., according to the growth level. This allows the wastewater to be treated by microalgae at different time stages according to the time difference, which not only ensures the purification effect, but also harvests the mature microalgae like crop rotation in farmland, avoiding the mixing of immature algae and stabilizing the production of resources.

[0031] Next, during wastewater treatment, the wastewater is introduced into different microalgae cultivation tanks 3 for preliminary decomposition. The bottom of each of the four microalgae cultivation tanks 3 is connected to a square flow pipe 9, and the square flow pipe 9 has a matching square butterfly valve inside (not shown in the figure). After decomposition, the pre-decomposed and purified wastewater is discharged into the main body of the constructed wetland 2 by opening the square butterfly valve. The filter plate 6 can block a large number of microalgae, preventing a large number of microalgae from entering the main body of the constructed wetland 2. The remaining dissolved organic pollutants, suspended solids and nitrogen and phosphorus compounds in the wastewater are removed through the synergistic effect of microorganisms and plants. By adjusting the flow pattern and depth of the constructed wetland 2, the redox gradient required by the microbial fuel cell can be obtained, thus combining the two to construct a microbial fuel cell type constructed wetland. The wastewater filtered by the microalgae cultivation tanks 3 and the main body of the constructed wetland 2 will be discharged through the flow hole 14 opened on the outer wall of the treatment tank 1, and can be collected and guided to the discharge position through the spiral collection pipe 15 for collection.

[0032] Then, during the discharge process, the filter screen plate 6 is prone to clogging due to the impact of the water flow, which affects the discharge efficiency of the sewage. Therefore, during the discharge process, the drive motor 10 installed outside the microalgae cultivation tank 3 can drive the shaft 701 to rotate. Limiting grooves 705 are opened on both sides of the inner wall of the microalgae cultivation tank 3, and limiting blocks 706 are fixedly connected to the outer walls of both sides of the two push plates 702. The outer wall of the limiting block 706 slides against the inner wall of the limiting groove 705, so that the push plate 702 can be restricted by the limiting block 706 and the limiting groove 705, so that the push plate 702 can only move in translation.

[0033] Next, connecting rod 1 703 is fixedly connected at equal intervals to the outer wall of shaft 701, and connecting rod 2 704 is hinged to the far ends of the two connecting rod 1 703. The far ends of the two connecting rod 2 704 are hinged to the outer wall of the two push plates 702 on the side that are close to each other. Thus, when shaft 701 rotates, the two push plates 702 can be driven to move closer to each other through the cooperation of connecting rod 1 703 and connecting rod 2 704. Similarly, when shaft 701 reverses, the two push plates 702 can be driven to move away from each other. Furthermore, the forward and reverse rotation angle of shaft 701 is 90 degrees, which is matched and linked with the subsequent components, so that the two push plates 702 move closer to each other to clean the microalgae on the surface of filter plate 6 and push them to the middle to gather, so as to avoid clogging of the entire filter plate 6, ensure the effective flow area of ​​filter plate 6, and avoid clogging and difficulty in discharge when sewage is discharged from the mature microalgae cultivation tank 3 in the later stage of growth. This helps to ensure the stability of sewage treatment of this device.

[0034] Furthermore, in order to ensure the interception effect of the filter screen 6 on mature microalgae, several fillers can be set inside the microalgae cultivation tank 3. The fillers are one or more of flannel, loofah, biochar, sawdust, and microfiber, which are used to make the microalgae aggregate larger so that they can be easily intercepted and compressed when they mature and detach.

[0035] In the above implementation process, this application can also utilize the volume difference between mature and immature microalgae. During the growth cycle of microalgae, cell division is active in the immature stage (exponential growth phase), and the size is relatively small and uniform; in the mature stage (stationary phase), cell division slows down, and the volume increases due to the accumulation of metabolic products (such as lipid droplets and starch granules), which is the core point. According to the pore diameter of the filter screen, a filter screen that conforms to the mature stage of microalgae (i.e., the pore size is smaller than that of mature microalgae and larger than that of immature microalgae) is first set up. The mature microalgae in the wastewater are first intercepted by this filter screen, and the remaining wastewater and immature microalgae will flow into the discharge hole 12. Then, it will be filtered through a filter screen with a pore diameter that conforms to that of immature microalgae (i.e., the pore size is smaller than that of immature microalgae) to complete the screening. Finally, the water is completely discharged through the discharge hole 12. This is the whole technical means. Secondly, since the absolute size difference of different types of microalgae is significant (e.g., Chlorella has a diameter of 2-10 μm, while diatoms can reach 100 μm), the water is also affected. The difference in size between mature and immature microalgae (μm) makes the volume difference between them more significant, thus facilitating sieving through filters with different pore sizes.

[0036] Regarding the source of information on the pore size of the filter screen, please refer to Chinese Patent Publication No. CN118903912A, which discloses a continuous filtration device for microalgae cultivation. It mentions the conventional pore size of microalgae filter screens, which uses a metal filter membrane. The metal porous separation layer in the metal filter membrane mainly plays the role of filtration and separation, and is used to control the filtration accuracy. The average pore size of the metal porous separation layer is 0.5 to 5 μm, which can meet the filtration and production needs of most commercial microalgae.

[0037] Regarding the question that (mature microalgae need to aggregate through attachments such as seahorse hair to have a larger volume in order to remain on filter plate 6), as can be seen from the above, this case uses the size difference of the microalgae themselves to achieve sieving, rather than requiring several microalgae to aggregate into a larger volume to distinguish them.

[0038] Example 2: Based on the above examples, the inner wall of the microalgae culture tank 3 is provided with a compression and reduction component 8;

[0039] Furthermore, the compression and reduction component 8 includes a support plate 801. The inner walls of both sides of the microalgae culture tank 3 are provided with grooves 11 corresponding to the support plate 801. The outer walls of both ends of the support plate 801 are slidably connected to the inner wall of the grooves 11. The bottom of the support plate 801 is fixedly connected with pressing blocks 802 at equal distances. The bottom of the two pressing blocks 802 is symmetrically provided with extrusion plates 803. The bottom of the pressing blocks 802 is provided with merging inclined grooves 804 corresponding to the two extrusion plates 803. One side of the outer wall of one of the two adjacent extrusion plates 803 is provided with forming grooves 805 at equal distances. The other side of the outer wall of the two adjacent extrusion plates 803 is fixedly connected with extrusion blocks 806 at equal distances. The outer wall of the extrusion block 806 slides and matches the inner wall of the forming groove 805.

[0040] More specifically, in the embodiment, the bottom of the support plate 801 is fixedly connected with pressing blocks 802 at equal distances, and the bottom of the two pressing blocks 802 is symmetrically provided with extrusion plates 803. The outer wall of the two adjacent extrusion plates 803 that are far apart is fixedly connected with a connecting frame 807. At the same time, the outer walls of the two sides of the pressing blocks 802 are fixedly connected with support rods 808 corresponding to the connecting frame 807. The two connecting frames 807 are provided with guide grooves 809 through the support rods 808. The outer wall of the support rods 808 slides against the inner wall of the guide grooves 809. The ends of the two support rods 808 that are far apart are fixedly connected with anti-detachment ring caps 810. At the same time, the outer walls of the two sides of the pressing blocks 802 are fixedly connected with return springs 811. Thus, under the elastic force of the return springs 811, the two adjacent extrusion plates 803 are separated, and the maximum degree of separation of the two extrusion plates 803 is limited by the anti-detachment ring caps 810.

[0041] Next, when the two push plates 702 approach each other to a certain distance, one of the connecting rods 703 will press against the support plate 801. At this time, grooves 11 are opened on both sides of the inner wall of the microalgae cultivation tank 3 corresponding to the support plate 801, and the outer walls of both ends of the support plate 801 are slidably connected to the inner wall of the grooves 11. Return springs 812 are fixedly connected to the bottom of both sides of the support plate 801, and the bottom of the return springs 812 is fixedly connected to the inner wall of the grooves 11. This allows the inner wall of the grooves 11 to limit the lifting and lowering displacement of the support plate 801 and simultaneously stretch the return springs 812. At this time, the pressure plate 802... 3. During the descent until it touches the filter plate 6, it will remain in a separated state, so that it can insert into the mature microalgae gathered by the two push plates 702, so that some mature microalgae can enter between the two extrusion plates 803. When the extrusion plate 803 descends to the surface of the filter plate 6, if it continues to descend, it will be restricted by the filter plate 6 and the two extrusion plates 803 will not be able to descend further. So the top of the two extrusion plates 803 can be squeezed by the merging inclined groove 804 opened at the bottom of the lower pressure block 802, so that the two adjacent extrusion plates 803 will approach each other horizontally under the restriction of the guide groove 809 and the support rod 808.

[0042] Next, several forming grooves 805 are opened on one side wall of one of the two adjacent extrusion plates 803, and several extrusion blocks 806 are opened on the other side. This allows the microalgae between the two adjacent extrusion plates 803 to be extruded and formed, achieving the purpose of compression. Similarly, when the shaft 701 reverses, the support plate 801 will be driven to rise by the rebound force of the second return spring 812, and the two adjacent extrusion plates 803 can be reset and separated by the first return spring 811, completing one compression cycle. This allows the aggregated microalgae to be divided and compressed into a square shape, greatly reducing the retention area of ​​a large number of microalgae on the filter plate 6, further ensuring the flow and filtration efficiency of sewage. At the same time, the compressed volume can be used to avoid repeated clogging of the holes of the filter plate 6, reduce the cleaning difficulty of the push plate 702, and facilitate the subsequent opening of the side door 13 to collect and remove mature microalgae.

[0043] Working principle: During the discharge process, the drive motor 10 installed outside the microalgae cultivation tank 3 drives the shaft 701 to rotate. Through the cooperation of connecting rod 1 703 and connecting rod 2 704, the two push plates 702 are driven to move closer to each other. Similarly, when the shaft 701 rotates in reverse, it can drive the two push plates 702 to move away from each other. Furthermore, the forward and reverse rotation angle of the shaft 701 is 90 degrees, which is matched and linked with the subsequent components, so that the two push plates 702 move closer to each other to clean up a large number of microalgae on the surface of the filter plate 6 and push them to the middle to gather, so as to avoid clogging of the entire filter plate 6, ensure the effective flow area of ​​the filter plate 6, and avoid clogging and difficulty in discharge when the sewage is discharged from the mature microalgae cultivation tank 3 in the later stage of growth. This helps to ensure the sewage treatment stability of this device.

[0044] Next, when the two push plates 702 approach each other to a certain distance, one of the connecting rods 703 will squeeze the support plate 801. During the process of the squeezing plate 803 descending until it touches the filter plate 6, it will remain in a separated state, so that the mature microalgae gathered by the two push plates 702 can be inserted, allowing some mature microalgae to enter between the two squeezing plates 803. When the squeezing plate 803 descends to the surface of the filter plate 6, it will be restricted by the filter plate 6 and the two squeezing plates 803 will not be able to descend further. Then, the top of the two squeezing plates 803 can be squeezed by the merging inclined groove 804 opened at the bottom of the lower pressure block 802. The two adjacent squeezing plates 803 will approach each other horizontally under the restriction of the guide groove 809 and the support rod 808, so that the microalgae between the two adjacent squeezing plates 803 can be squeezed and shaped, achieving the purpose of compression and greatly reducing the retention area of ​​microalgae on the filter plate 6, further ensuring the flow and filtration efficiency of sewage.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A microbial fuel type sewage treatment device based on microalgae constructed wetland coupling, comprising a treatment tank (1), a constructed wetland main body (2), and a microalgae culture tank (3), characterized in that: The artificial wetland body (2) is set inside the bottom of the treatment tank (1). The top inner wall of the treatment tank (1) is fixedly connected with the microalgae culture tank (3) at equal distances. The two sides of the microalgae culture tank (3) are fixed between two adjacent installation blocks (4). The anode biomaterials (5) are fixedly installed at equal distances inside the artificial wetland body (2). The inner wall of the microalgae culture tank (3) is fixedly connected with the filter screen plate (6). The cathode biomaterials are fixedly installed at equal distances inside the microalgae culture tank (3). The bottom of the four microalgae culture tanks (3) are all connected with square flow pipes (9). The bottom of the microalgae culture tank (3) is opened with a discharge hole (12). The inner wall of the microalgae cultivation tank (3) is provided with a drainage component (7) to clean the microalgae on the surface of the filter plate (6) and push them to the middle to gather during the sewage treatment process. The inner wall of the microalgae culture tank (3) is provided with a compression and reduction component (8) to divide and compress the aggregated microalgae into a square shape; the unblocking and drainage component (7) includes a shaft (701), one end of which is rotatably connected to the inner wall of the microalgae culture tank (3), and the other end of which extends through the interior of the microalgae culture tank (3) to the exterior of the microalgae culture tank (3). A drive motor (10) is fixedly installed on one side of the outer wall of the microalgae culture tank (3) corresponding to the shaft (701). One end of the output shaft of the drive motor (10) is fixed to the extended end of the microalgae culture tank (3). The inner wall of the microalgae culture tank (3) is symmetrical to the filter plate (6). A push plate (702) is provided, and connecting rods 1 (703) are fixedly connected at equal intervals to the outer wall of the shaft (701). Connecting rods 2 (704) are hinged to the ends of the two connecting rods 1 (703) that are far apart. The ends of the two connecting rods 2 (704) that are far apart are hinged to the outer wall of the two push plates (702) that are close to each other. The bottoms of the two push plates (702) are slidably connected to the top surface of the filter plate (6), and the bottoms of the push plates (702) are inclined. Limiting grooves (705) are opened on the inner walls of both sides of the microalgae cultivation pool (3). Limiting blocks (706) are fixedly connected to the outer walls of both sides of the two push plates (702), and the limiting blocks (706) are fixedly connected to the outer walls of both sides of the push plates (702). 6) The outer wall of the compression component (8) is in contact with and slides against the inner wall of the limiting groove (705); the compression component (8) includes a support plate (801), and the inner walls of both sides of the microalgae culture tank (3) are provided with grooves (11) corresponding to the support plate (801). The outer walls of both ends of the support plate (801) are in contact with and slide against the inner wall of the groove (11), and the bottom of the support plate (801) is fixedly connected with pressing blocks (802) at equal distances. The bottoms of the two pressing blocks (802) are symmetrically provided with extrusion plates (803), and the bottoms of the pressing blocks (802) are provided with merging inclined grooves (804) corresponding to the two extrusion plates (803). One side of one of the two adjacent extrusion plates (803) is outside The wall is provided with forming grooves (805) at equal intervals. On the outer wall of the other side of the two adjacent extrusion plates (803), extrusion blocks (806) are fixedly connected at equal intervals. The outer wall of the extrusion block (806) slides and matches the inner wall of the forming groove (805). A connecting frame (807) is fixedly connected to the outer wall of the two adjacent extrusion plates (803) on the side away from each other. Support rods (808) are fixedly connected to the outer walls of the two sides of the lower pressing block (802) corresponding to the connecting frame (807). The two connecting frames (807) and the support rods (808) are provided with guide grooves (809) through them. The outer wall of the support rod (808) slides and fits against the inner wall of the guide groove (809).

2. The microbial fuel-based wastewater treatment device based on microalgae-enhanced wetlands according to claim 1, characterized in that, Anti-detachment ring caps (810) are fixedly connected to the ends of the two support rods (808) that are far apart. Reset springs (811) are fixedly connected to the outer walls of both sides of the lower pressure block (802). The ends of the two reset springs (811) that are far apart are fixedly connected to the outer walls of the two connecting frames (807) that are close to each other. The extrusion plate (803) forms a telescopic structure with the reset springs (811) through the connecting frame (807). The end faces of the two anti-detachment ring caps (810) that are close to each other are pressed against the outer walls of the two connecting frames (807) that are far apart by the reset springs (811).

3. The microbial fuel-based wastewater treatment device based on microalgae-enhanced wetlands coupled according to claim 2, characterized in that, The bottom of both sides of the support plate (801) is fixedly connected with a second reset spring (812), and the bottom of the second reset spring (812) is fixedly connected to the inner wall of the slide groove (11).

4. The microbial fuel-based wastewater treatment device based on microalgae-enhanced wetlands according to claim 1, characterized in that, A side door panel (13) is hinged to one side of the outer wall of the four microalgae culture tanks (3). A flow hole (14) is opened through the outer wall of the treatment tank (1) corresponding to the artificial wetland body (2). A collection pipe (15) is fixedly connected to the outer wall of the treatment tank (1) corresponding to the flow hole (14). The collection pipe (15) is spiral.

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