An artificial wetland for purifying tail water with fishery and photovoltaic complementary

Abstract

The present invention relates to the technical field of tail water treatment, and specifically relates to an artificial wetland for purifying tail water with fishery-photovoltaic complementarity, which includes a preliminary purification area with a first box body, an inlet main pipe, inlet branch pipes and a stirring and aeration device, a first wetland area with a facultative microbial part and an anaerobic microbial part, and a second wetland area with an aerobic microbial part and a mechanical aeration area. The purpose of the present invention is to solve the problems in the prior art such as poor pertinence of various tail water treatment methods, poor purification effect, high cost and difficult maintenance. The tail water is preliminarily purified through the water flow stirring and aeration treatment in the preliminary purification area, and the tail water is also purified by the cooperation of the microbial parts with different characteristics in the first wetland area and the second wetland area, realizing the efficient purification of the tail water, with less investment and easy maintenance. The microbial fuel cells are also constructed in the first wetland area and the second wetland area to optimize the electrochemical reaction and carry out energy recovery while realizing energy conservation and environmental protection.

Description

Technical Field

[0001] This application relates to the technical field of fishery-photovoltaic complementary construction, and particularly relates to a constructed wetland for purifying tail water in fishery-photovoltaic complementarity. Background Art

[0002] Ordinary aquaculture tail water mainly comes from the excrement, residual bait, metabolites, etc. of farmed animals, which contain a large amount of nutrients such as nitrogen and phosphorus, as well as various suspended solids, organic matter and other pollutants. In addition to the components in the above-mentioned ordinary aquaculture tail water, the aquaculture tail water in the fishery-photovoltaic complementary project also has the additional shading and cooling effects of the photovoltaic panel array and the decomposition effect of microorganisms in the water. These factors will lead to higher concentrations of nutrients and pollutants in the tail water of the fishery-photovoltaic complementary project, and the treatment difficulty is also greater.

[0003] At present, the main aquaculture tail water treatment methods include natural sedimentation and biodegradation method, biological filter method, constructed wetland method and recirculating water system method, etc. Among them, the natural sedimentation and biodegradation method mainly relies on microorganisms and plants in the natural environment to degrade organic matter and nutrients such as nitrogen and phosphorus; the biological filter method is to remove suspended solids and degrade organic waste through the biofilm in the artificially constructed filter; the constructed wetland method is more common, which is to construct wetland vegetation and wetland soil, and use the adsorption and degradation ability of wetland plants and the filtering effect of wetland soil to treat aquaculture tail water; the recirculating water system method is to circulate and treat aquaculture tail water through a system composed of biological filters, sedimentation tanks, biological treatment tanks, etc. to minimize the impact on the external water environment. This method is mostly applied to some relatively large-scale farms.

[0004] When the above methods are applied to the treatment of tail water in the fishery-photovoltaic complementary project, there are various problems. For example, the natural sedimentation and biodegradation method is mostly applied to some small-scale farms, and there will be problems of low efficiency when treating the tail water of the fishery-photovoltaic complementary project with a generally large treatment scale; for the high-concentration organic matter and nutrients such as nitrogen and phosphorus in the tail water, the biological filter also has the problem of low treatment efficiency; while the constructed wetland method usually occupies a large area and is difficult to cope with problems such as excessive nutrients and odor generation in the tail water; and the recirculating water system method has high construction and operation costs, difficult equipment maintenance, and is difficult to promote and apply in the case of lack of capital investment.

[0005] Therefore, the existing technology has defects and needs to be improved and developed. Summary of the Invention

[0006] To solve the problems of the above-mentioned existing technology, the present invention provides a constructed wetland for purifying tail water in fishery-photovoltaic complementarity, which solves the problems of poor pertinence, poor purification effect, high input cost and great maintenance difficulty of various tail water treatment methods in the existing technology.

[0007] The present invention provides an artificial wetland for purifying tail water with fishery-photovoltaic complementarity, comprising:

[0008] A preliminary purification area, which includes a first box body, a main water inlet pipe, water inlet branch pipes and a stirring and aerating device;

[0009] Among them, the first box body is divided into an upper part of the first box body, a middle part of the first box body and a lower part of the first box body according to its height;

[0010] The main water inlet pipe includes a first main water inlet pipe horizontally arranged outside the first box body and a second main water inlet pipe vertically arranged inside the first box body. The water inlet end of the second main water inlet pipe is butt-connected and communicated with one end of the first main water inlet pipe at a right angle, and the water outlet end of the second main water inlet pipe passes through the first box body and extends into the upper part of the first box body;

[0011] There are several water inlet branch pipes symmetrically arranged on both sides of the second main water inlet pipe, and the water inlet end of the water inlet branch pipe is communicated with the water outlet end of the second main water inlet pipe, and the water outlet end of the water inlet branch pipe extends to the upper part or the middle part of the second box body;

[0012] The stirring and aerating device is arranged in the lower part of the first box body. The stirring and aerating device includes a motor, a rotating shaft, a turntable and a strengthening unit. One end of the rotating shaft is connected to the output end of the motor, and the other end is connected to the turntable. A plurality of connecting rods perpendicular to it are evenly arranged on the outer edge of the turntable, and the strengthening unit is detachably suspended at both ends of the connecting rod;

[0013] A first wetland area, which includes an facultative microorganism part and an anaerobic microorganism part separated horizontally. A first communication pipe is arranged at the bottom of the facultative microorganism part and is communicated with the lower part of the first box body through it;

[0014] Among them, fiber bundle fillers are filled in the facultative microorganism part;

[0015] A first immobilized bacteria and algae filler is filled in the anaerobic microorganism part. The first immobilized bacteria and algae filler includes a first algae filler and anaerobic bacteria attached to the first algae filler. An anode rod is buried in the anaerobic microorganism part;

[0016] A second wetland area, which has an aerobic microorganism part. A second communication pipe is arranged at the top of the aerobic microorganism part and is communicated with the anaerobic microorganism part through it;

[0017] Among them, a second immobilized bacteria and algae filler is filled in the aerobic microorganism part. The second immobilized bacteria and algae filler includes a second algae filler and aerobic bacteria attached to the second algae filler. A cathode rod is buried in the aerobic microorganism part. The cathode rod is connected to the anode rod through a wire, and a resistor is serially arranged on the wire and an energy storage battery is arranged in parallel.

[0018] Furthermore, an oxygen input and air purification part is further included. The oxygen input and air purification part includes a second box body and a natural ventilation pipe.

[0019] Among them, the second box body is separated into a mixed filler part and a water storage part by a horizontally arranged porous support plate. The mixed filler part is filled with planting soil and activated carbon, and the water storage part is a box body with water seepage holes all over.

[0020] The natural ventilation pipe is densely provided with ventilation holes. The air inlet end of the natural ventilation pipe is arranged above the mixed filler part, and the air outlet end of the natural ventilation pipe passes through the mixed filler part and extends above the support plate to the first box body.

[0021] Furthermore, the air outlet end of the natural ventilation pipe extends in the middle of the first box body at an angle of 120° to 150°.

[0022] Furthermore, the water inlet main pipe further includes a first sedimentation part.

[0023] The first sedimentation part is concave and is arranged at the connection and communication part of the first water inlet main pipe and the second water inlet main pipe.

[0024] Furthermore, the water inlet main pipe further includes a sedimentation aid plate. There are several sedimentation aid plates, which are arranged in the second water inlet main pipe in a staggered manner at a preset angle in the length direction of the second water inlet main pipe.

[0025] Furthermore, the preliminary purification area further includes a second sedimentation part.

[0026] The second sedimentation part is a folded plate structure with a containing space. The first sedimentation part is arranged in the first box body and is located below the water inlet branch pipe.

[0027] Furthermore, the second wet area further includes a mechanical oxygenation part. The mechanical oxygenation part is arranged in the aerobic microorganism part and an aeration device is arranged therein.

[0028] Furthermore, the strengthening unit includes fiber filter media, hollow balls and a telescopic device.

[0029] Among them, one end of the fiber filter media is connected to the connecting rod, and the other end of the fiber filter media is connected to one end of the telescopic device through a hollow ball.

[0030] The first through hole and the second through hole are respectively arranged on the connection sides of the hollow ball with the fiber filter material and the telescopic device, and the aperture of the first through hole is larger than that of the second through hole;

[0031] The telescopic device includes a spring and a counterweight. One end of the spring is connected to the hollow ball, and the other end is connected to the counterweight. A felt is sleeved outside the spring, and the felt can be extended or compressed as the spring deforms.

[0032] Furthermore, the turntable is circular or regular polygon. The turntable is connected to each of the connecting rods one by one with its center to be divided into several rotating units, and partitions are arranged between adjacent rotating units.

[0033] Furthermore, it further includes a dissolved oxygen meter and a blowing device;

[0034] Wherein, the dissolved oxygen meter includes a detection end and a display end. The detection end is arranged in the first box body and extends to the lower part of the first box body, and the display end is arranged on the top of the first box body and is electrically connected to the detection end;

[0035] The blowing device includes an air delivery end and a control end. The air delivery end extends into the first box body, and the control end is arranged on the top of the first box body and is electrically connected to the air delivery end.

[0036] The present invention has at least the following beneficial effects:

[0037] The constructed wetland for purifying tail water with fishery-photovoltaic complementary of the present invention, by combining the preliminary purification area, the first wetland area, the second wetland area and the oxygen input and air purification part, has higher efficiency in treating the tail water of the fishery-photovoltaic complementary project compared with the traditional natural sedimentation and biodegradation methods when treating large-scale tail water. It also solves the problem of odor generation in the traditional constructed wetland method, and has low input cost, easy availability of consumables, and is easy to monitor and maintain.

[0038] The constructed wetland for purifying tail water with fishery-photovoltaic complementary of the present invention, by using specific bacterial and algal fillers in the facultative microorganism part, anaerobic microorganism part and aerobic microorganism part, avoids the problem of mutual exclusion of activities caused by the integration of microorganisms with different habits in a vertical wetland, and can more effectively remove high-concentration organic matters and nutrients such as nitrogen and phosphorus in the tail water, solves the deficiencies of the biological filter method in this regard, and at the same time greatly improves the redox potential, improves the performance of the microbial fuel cell and conducts energy recovery, with high energy utilization rate.

[0039] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0040] Figure 1 It is a schematic internal structure diagram of an artificial wetland for purifying tail water with fishery-photovoltaic complementarity provided by an embodiment of the present application.

[0041] Figure 2 It is a schematic internal structure diagram of the preliminary purification area provided by an embodiment of the present application.

[0042] Figure 3 It is a front view of the stirring and aerating device provided by an embodiment of the present application.

[0043] Figure 4 It is a side view of the stirring and aerating device provided by an embodiment of the present application.

[0044] Figure 5 It is a schematic structure diagram of the strengthening unit provided by an embodiment of the present application.

[0045] Figure 6 It is a schematic internal structure diagram of the first wetland area and the second wetland area provided by an embodiment of the present application.

[0046] In the figure, the meanings of the respective reference numerals are as follows:

[0047] 1 - Preliminary purification area, 110 - First box body, 120 - Main water inlet pipe, 121 - First main water inlet pipe, 122 - Second main water inlet pipe, 123 - First precipitation part, 124 - Sedimentation assisting plate, 130 - Water inlet branch pipe, 140 - Stirring and aerating device, 141 - Rotating shaft, 142 - Turntable, 143 - Partition board, 144 - Strengthening unit, 145 - Fiber filter material, 146 - Hollow ball, 147 - Connecting rod, 1461 - First through hole, 1462 - Second through hole, 148 - Counterweight, 149 - Felt, 150 - Second precipitation part, 160 - Spring

[0048] 2 - First wetland area, 210 - Facultative microorganism part, 211 - Fiber bundle packing, 220 - Anaerobic microorganism part, 221 - First immobilized bacteria and algae packing, 222 - Anode rod

[0049] 3 - Second wetland area, 310 - Aerobic microorganism part, 311 - Second immobilized bacteria and algae packing, 320 - Mechanical aeration part, 321 - Cathode rod

[0050] 4 - Oxygen transportation and air purification part, 410 - Second box body, 411 - Support plate, 412 - Mixed packing part, 413 - Water storage part, 420 - Natural air pipe

[0051] 5 - First connecting pipe

[0052] 6 - Second connecting pipe

[0053] 7 - Resistor

[0054] 8 - Energy storage battery

[0055] 9 - Blower equipment

[0056] 10 - Drain pipe Detailed implementation manners

[0057] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0058] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0059] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0060] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include contact between the first and second features through additional features therebetween rather than direct contact. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and diagonally above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and diagonally below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0061] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure of this application, components and settings of specific examples are described hereinafter. Of course, they are merely examples and are not intended to limit this application. In addition, this application may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0062] The aquaculture industry is an important part of China's agricultural economy. However, the problem of tail water pollution caused by aquaculture is becoming increasingly serious. Aquaculture tail water mainly comes from the excrement, residual bait and metabolites of aquaculture animals, which contain a large amount of nutrients such as nitrogen and phosphorus, as well as various other pollutants such as suspended solids and organic matter. In the fishery-photovoltaic complementary project, due to the shading and cooling effects of the photovoltaic panel array and the decomposition of microorganisms in the water, the concentration of nutrients and pollutants in the tail water is higher, and the treatment difficulty is also greater.

[0063] At present, the main aquaculture tail water treatment methods include natural sedimentation and biodegradation method, biological filter method, constructed wetland method and recirculating water system method, etc. However, there are many problems when these methods are used to treat the tail water of the fishery-photovoltaic complementary project. For example, the efficiency of natural sedimentation and biodegradation method is relatively low when treating the tail water of large-scale fishery-photovoltaic complementary projects; the biological filter method has low treatment efficiency for high-concentration organic matter and nutrients such as nitrogen and phosphorus in the tail water; the constructed wetland method occupies a large area and is difficult to cope with problems such as periodic water quality fluctuations and excessive nutrients in the water; the recirculating water system method has high construction and operation costs, and is difficult to maintain equipment. It is difficult to promote and apply without capital investment.

[0064] Based on the above situation, the present application proposes an artificial wetland for tail water purification, which can be specifically applied to the fishery-photovoltaic complementary project, solving the problems in the prior art such as poor pertinence of various tail water treatment methods, poor purification effect, high input cost, and great maintenance difficulty. It can specifically treat the tail water of the fishery-photovoltaic complementary project, and has the advantages of high purification efficiency, low construction cost, simple maintenance, and high resource utilization rate.

[0065] Referring to Figure 1 , which shows a schematic internal structure diagram of an artificial wetland for tail water purification of a fishery-photovoltaic complementary project of the present application. As can be seen from the figure, the artificial wetland for tail water purification includes a preliminary purification area 1, a first wetland area 2, and a second wetland area 3.

[0066] Referring to Figure 1 and Figure 2 , the preliminary purification area 1 includes a first box body 110, a main water inlet pipe 120, a branch water inlet pipe 130, and a stirring and aeration device 140.

[0067] Among them, the first box body 110 can be divided into an upper part of the first box body, a middle part of the first box body, and a lower part of the first box body according to its height. In this embodiment, the three parts divided by the first box body 110 are not strictly limited to being equally divided, but only for a general description of the orientation of each component therein for those skilled in the art to adjust according to their own needs.

[0068] The main water inlet pipe 120 includes a first main water inlet pipe 121 horizontally arranged outside the first box body 110 and a second main water inlet pipe 122 vertically arranged inside the first box body 110. The water inlet end of the second main water inlet pipe 122 is butt-connected and communicated with one end of the first main water inlet pipe 121 at a right angle, and the water outlet end of the second main water inlet pipe 122 passes through the first box body 110 and extends into the upper part of the first box body. As can be seen from Figure 2 , the height of the second main water inlet pipe 122 also determines the maximum height of the water volume that the first box body 110 can accommodate.

[0069] There are several branch water inlet pipes 130 symmetrically arranged on both sides of the second main water inlet pipe 122, and the water inlet end of the branch water inlet pipe 130 is communicated with the water outlet end of the second main water inlet pipe 122. The water outlet end of the branch water inlet pipe 130 extends into the upper part or the middle part of the first box body. Referring to Figure 2 , in this embodiment, the horizontal part of the branch water inlet pipe 130 and the second main water inlet pipe 122 as a whole are in an inverted "L" shape to cooperate with each other for tail water level control, that is, when the tail water reaches a certain height, the inverted "L" shaped tubular structure can prevent the tail water from rising further or allow the tail water to flow out, thereby controlling the water level of the tail water.

[0070] Referring to Figures 2 to 4, the stirring aeration device 140 is arranged at the lower part of the first box body. The stirring aeration device 140 includes a motor (not shown in the figure), a rotating shaft 141, a turntable 142 and a strengthening unit 144. One end of the rotating shaft 141 is connected to the output end of the motor, and the other end is connected to the turntable 142. A plurality of connecting rods 147 perpendicular to the turntable 142 are uniformly arranged on the outer edge of the turntable 142. The strengthening unit 144 is detachably suspended at both ends of the connecting rod 147. Among them, to ensure the stability of operation, refer to Figure 3 , the turntable 142 can be circular or regular polygon.

[0071] Refer to Figure 1 and Figure 6 , the first wet area 2 includes an facultative microorganism part 210 and an anaerobic microorganism part 220 which are horizontally separated. A first communication pipe 5 is arranged at the bottom of the facultative microorganism part 210 and is communicated with the lower part of the first box body through it. To ensure the smooth flow of water, the facultative microorganism part 210 and the anaerobic microorganism part 220 can be separated by a porous plate. Among them, the facultative microorganism part 210 is filled with fiber bundle fillers 211. For the convenience of replacement, the fiber bundle fillers 211 can be hung on the above-mentioned separating plate.

[0072] The anaerobic microorganism part 220 is filled with a first immobilized bacteria and algae filler 221. The first immobilized bacteria and algae filler 221 includes a first algae filler and anaerobic bacteria attached to the first algae filler.

[0073] Refer to Figure 6 , the second wet area 3 has an aerobic microorganism part 310. A second communication pipe 6 is arranged at the top of the aerobic microorganism part 310 and is communicated with the anaerobic microorganism part 220 through it.

[0074] Among them, the aerobic microorganism part 310 is filled with a second immobilized bacteria and algae filler 311. The second immobilized bacteria and algae filler 311 includes a second algae filler and aerobic bacteria attached to the second algae filler.

[0075] Hereinafter, one embodiment of the present invention will be specifically described in further combination with the preliminary purification area 1, the first wet area 2 and the second wet area 3 in the above structure and their corresponding specification drawings.

[0076] First, refer to Figure 1 and Figure 2 , the tail water enters from the water inlet end of the first main water inlet pipe 121, and then sequentially passes through the second main water inlet pipe 122 and the water inlet branch pipe 130 and is discharged into the first box body 110 for temporary storage. Refer to Figure 2, a concave first sedimentation part 123 is further arranged in the main water inlet pipe 120. The first sedimentation part 123 is located at the intersection and connection position of the first main water inlet pipe 121 and the second main water inlet pipe 122, and is used for collecting solid impurities deposited during the process of tail water inlet. In addition, a plurality of sedimentation assisting plates 124 are arranged in the second main pipe. The sedimentation assisting plates 124 are staggeredly arranged in the second main water inlet pipe 122 at an angle of 30° to 45° in the length direction of the second main water inlet pipe 122 to assist the suspended solids in the tail water to slide into the first sedimentation part 123 more quickly. Refer to Figure 2 , similarly, the second sedimentation part 150 arranged below the water inlet branch pipe 130 functions to further collect the suspended substances in the tail water discharged from the water inlet branch pipe 130. It should be noted that the impurities deposited in the first sedimentation part 123 and the second sedimentation part 150 can be regularly suction-cleaned by opening a box cover at the top of the first box body 110. The specific form can be set by those skilled in the art with reference to common manhole covers, and will not be elaborated here.

[0077] At this time, the stirring and aeration device 140 is in a starting state. Driven by the motor, the rotating shaft 141 therein drives the turntable 142 and the strengthening unit 144 to rotate in the tail water to stir the tail water in the box and perform adsorption and purification.

[0078] Specifically, during the rotation of the turntable 142, its surface will alternately contact the tail water and the air. As time goes by, a biofilm rich in microorganisms will adhere to the surface of the turntable 142. After the turntable 142 rotates into the tail water, the biofilm thereon can adsorb the organic pollutants in the tail water, absorb the dissolved oxygen in the water film outside the biofilm to decompose the organic matter, and at the same time the microorganisms reproduce themselves in this process; when the turntable 142 rotates out of the tail water, a new tail water film will form on its surface again. At this time, the oxygen in the air continuously dissolves into the tail water film, so that the microorganisms in the biofilm absorb the dissolved oxygen and oxidize and decompose the adsorbed organic pollutants through oxidation. That is, every time the turntable 142 rotates one week, a process of adsorption - oxygen absorption - oxidation and decomposition is synchronously carried out on its surface. As the turntable 142 rotates continuously, the pollutants are continuously oxidized and decomposed, and the biofilm gradually thickens. Finally, the aging biofilm falls off and precipitates under the action of the water flow shear force. Thus, the tail water is preliminarily purified in the preliminary purification area 1.

[0079] Refer to Figures 1 to 4, in this embodiment, the regular-shaped turntable 142 can be equally divided into several identical rotating units with the connection lines between its center point and each of the connecting rods 147 as boundaries. Convex partitions 143 can be arranged between adjacent rotating units to slow down the flow rate of the tail water on the surface of the turntable 142, extend its residence time, and promote the adsorption-oxygen absorption-oxidative decomposition process on the turntable 142, thereby improving the purification effect.

[0080] Next, the preliminarily purified tail water flows out from the lower part of the first box body and enters the first wetland area 2 through the first connecting pipe 5. Refer to Figure 6 , the tail water flow first contacts the fiber bundle fillers 211 in the facultative microorganism part 210. These fiber bundle fillers 211 can provide a huge surface area for the growth of microorganisms. The microorganisms can attach to the surface of the fiber bundles and purify the tail water by degrading organic matter, removing suspended solids, and oxidizing pollutants. In the above process, the microorganisms in the facultative microorganism part 210 will consume a large amount of oxygen. Therefore, when flowing into the anaerobic microorganism part 220, the oxygen content in the tail water is relatively low, which is more conducive to creating an anaerobic environment and promoting the anaerobic digestion process. Specifically, after the tail water flows into the anaerobic microorganism part 220, the anaerobic bacteria attached to the algal fillers can degrade organic matter in an anaerobic environment and convert it into carbon dioxide, methane, etc., thereby effectively removing the rich organic matter in the tail water.

[0081] Subsequently, the tail water flows into the second wetland area 3 from the top of the anaerobic microorganism part 220 through the second connecting pipe. In the second wetland area 3, the tail water first degrades organic matter further under aerobic conditions in the aerobic microorganism part 310 by using the metabolic process of aerobic bacteria, and uses its nitrification, denitrification, and biological metabolic processes to remove high-concentration ammonia nitrogen, nitrite, and phosphorus in the tail water. The decomposition process of aerobic bacteria requires a large amount of oxygen. In this process, if appropriate aeration equipment is equipped, the dissolved oxygen level in the water can be increased, providing a better living environment for aerobic bacteria, thereby promoting the decomposition process. Therefore, in this embodiment, refer to Figure 6 , a mechanical oxygenation part 320 is arranged in the aerobic microorganism part 310, and the mechanical oxygenation part 320 is provided with several aeration devices to realize continuous oxygen supply to the aerobic microorganism part 310.

[0082] Finally, the water quality of the tail water discharged from the second wetland area 3 has been improved well, and it can be directly discharged and recycled through the drain pipe 10 arranged at the bottom of the second wetland area 3.

[0083] In the above process, in the embodiments of the present invention, according to the characteristics of the tail water of the fishery photovoltaic complementary project, the preliminary purification area 1, the first wetland area 2, and the second wetland area 3 with different effects are used to jointly purify the tail water, which can effectively remove organic matter and nutrients such as nitrogen and phosphorus in the tail water, and has the advantages of high purification efficiency, low construction cost, simple maintenance, and high resource utilization rate.

[0084] Referring to Figure 6 , as can be seen from the figure, in this embodiment, an anode rod 222 and a cathode rod 321 are respectively buried in the anaerobic microorganism part 220 and the aerobic microorganism part 310. The anode rod 222 and the cathode rod 321 can both be electrodes made of carbon felt materials, and the anode rod 222 is connected to the cathode rod 321 through a wire to form a microbial fuel cell. Specifically, anaerobic bacteria in the anaerobic microorganism part 220 generate electrons by metabolizing organic matter in the tail water and release them onto the anode rod 222. Correspondingly, aerobic bacteria in the aerobic microorganism part 310 receive electrons from the cathode rod 321 through an oxidation-reduction reaction, thereby promoting the activities of anaerobic bacteria and aerobic bacteria in both directions and improving the treatment efficiency and effect of the tail water. To control the flow rate of the current, a resistor 7 is connected in series on the wire to stabilize the output of the microbial fuel cell. In addition, an energy storage battery 8 is connected in parallel on both sides of the resistor 7. The energy storage battery 8 can store the electric energy generated by the microbial fuel cell and supply it to external devices when needed, effectively improving the energy efficiency of the system and reducing the system operation cost.

[0085] In this embodiment, referring to Figures 3 to 5 , the strengthening unit 144 suspended on the turntable 142 includes a fiber filter material 145, a hollow ball 146, and a telescopic device; wherein, one end of the fiber filter material 145 is connected to the connecting rod 147, and the other end of the fiber filter material 145 is connected to one end of the telescopic device through the hollow ball 146; first through holes 1461 and second through holes 1462 are respectively arranged on the sides of the hollow ball 146 connected to the fiber filter material 145 and the telescopic device, and the aperture of the first through hole 1461 is larger than that of the second through hole 1462; the telescopic device includes a spring 160 and a counterweight 148, one end of the spring 160 is connected to the hollow ball 146, and the other end is connected to the counterweight 148 to maintain a vertical state in water. In addition, a felt 149 is sleeved outside the spring 160, the surface of the felt 149 is densely covered with fluff, and it can be extended or compressed as the spring 160 deforms.

[0086] As the rotating disk 142 rotates, the reinforcing unit 144 also changes its orientation and state. Specifically, the state in which the spring 160 is only subjected to the gravity of the counterweight block 148 and is half stretched is defined as its initial state. When the reinforcing unit 144 enters the water, the telescopic device, the hollow ball 146 and the fiber filter material 145 contact the tail water in sequence.

[0087] Under the combined effect of the buoyancy of the telescopic device that enters the water first and the buoyancy of the hollow ball 146 that enters the water later, the spring 160 that was originally in a semi-stretched state recovers to an uncompressed state, and the felt 149 wrapped around the spring 160 also presents a folded and compressed state as the spring 160 recovers, and the hollow ball 146 is immediately filled with tail water through the first through hole 1461 and the second through hole 1462.

[0088] As the rotation continues, the fiber filter material 145 is the first to release water. Figure 5 The fiber filter material 145 in the shape of a dendrite has a high specific surface area, which can provide more surfaces for adsorbing or attaching microorganisms and also help the diffusion of oxygen in the filter material, thereby helping to improve the activity and treatment efficiency of aerobic microorganisms. When the hollow ball 146 discharges water, it slowly seeps outward through the second through hole 1462 and drips into the felt 149. The felt 149 that has discharged water is then stretched again with the spring 160 in an unbalanced state and is stretched and laid flat, and the water originally absorbed in the felt 149 is also squeezed out and drips. In the above process, the fiber structure of the felt 149 can not only effectively intercept and filter suspended solid particles, impurities and sediments in the tail water, but also serve as a matrix for microorganisms to attach and grow, so that these microorganisms can form biofilms on the surface of the felt 149, and then participate in the biodegradation process of organic matter. In addition, the felt 149 is low in cost and easy to maintain, and can be replaced separately or replaced as a whole with the strengthening unit 144. Therefore, the effect of selecting the felt 149 as the treatment medium is more significant in simplifying the water treatment process and reducing operating costs.

[0089] After a period of operation, the oxygen content in the preliminary purification area 1 gradually decreases and the proportion of waste gas such as carbon dioxide increases due to the continuous oxidation and decomposition of microorganisms. The temperature in the closed structure gradually increases and odor is easily generated. Therefore, in this embodiment, the artificial wetland also includes an oxygen supply and purification unit 4. Figure 1 and Figure 2, the oxygen supply and air purification part 4 includes a second box body 410 and a natural ventilation pipe 420. Among them, inside the second box body 410, a mixed filler part 412 and a water storage part 413 are separated by a horizontally arranged porous support plate 411. In the mixed filler part 412, planting soil and activated carbon are filled. The water storage part 413 is a box body covered with water seepage holes; the natural ventilation pipe 420 is densely covered with air holes. The air inlet end of the natural ventilation pipe 420 is arranged above the mixed filler part 412, and the air outlet end of the natural ventilation pipe 420 passes through the mixed filler part 412 and extends above the support plate 411 to the first box body 110.

[0090] In the above structure, the natural ventilation pipe 420 utilizes the temperature difference between the outside temperature and the temperature inside the first box body 110 to form convection. Specifically, when the outside air with a lower temperature meets the waste gas inside the first box body 110 with a higher temperature, due to the different densities and temperatures of the two, an air flow will be generated. Under normal circumstances, the outside air will sink into the first box body 110 to ensure the activity and treatment efficiency of microorganisms through sufficient oxygen supply, while the waste gas is adsorbed and deodorized by the filler in the mixed filler part 412 and then discharged to the outside.

[0091] Considering that the implementation site of the present invention is outdoors and is vulnerable to external weather conditions, therefore, a retaining wall is also provided at the top of the oxygen supply and air purification part 4 to prevent a large amount of rainwater from flowing into it. Similarly, a waterproof cap can also be provided at the top end of the natural ventilation pipe 420 for rain shielding. During rainfall, the rainwater accumulated at the top is blocked by the retaining wall outside the oxygen supply and air purification part 4, and part of the rainwater directly falls into the mixed filler part 412 and is quickly absorbed by the filler inside. When the rainfall is large, more rainwater enters the oxygen supply and air purification part 4, passes through the filtration and purification of the filler in the mixed filler part 412, enters the water storage part 413 through the porous support plate 411 for temporary storage, and finally directly seeps into the surrounding soil through the water seepage holes on the water storage part 413 or is discharged through the pipe network.

[0092] The natural ventilation pipe 420 is densely covered with air holes. Therefore, during the above rainwater discharge process, a small amount of rainwater will seep into the natural ventilation pipe 420. To prevent the seeped rainwater from accumulating in the pipe and obstructing gas convection and entering the first box body 110 before it can continue to penetrate downward to the support plate 411 below, therefore, referring to Figure 2 , the air outlet end of the natural ventilation pipe 420 extends in the middle of the first box body at an angle of 120° - 150°.

[0093] In some embodiments of the present invention, referring to Figure 1 and Figure 2, the first box 110 is also provided with a dissolved oxygen meter and a blower 9; wherein the dissolved oxygen meter includes a detection end and a display end, the detection end is arranged in the first box 110 and extends to the lower part of the first box, the display end is arranged at the top of the first box 110 and is electrically connected to the detection end; the blower 9 is arranged including a gas supply end and a control end, the gas supply end extends into the first box 110, and the control end is arranged at the top of the first box 110 and is electrically connected to the gas supply end. wherein the dissolved oxygen meter is used to measure the content of oxygen dissolved in the tail water in the first box 110, so that the operating personnel can directly judge whether it is necessary to take oxygenation measures by readings during daily inspections. when the oxygen content inside the first box 110 is insufficient, the blower 9 can be turned on and the outside air can be injected into the first box 110 through the gas supply end therein to increase the overall oxygen content of the system and ensure the subsequent reaction. It is understandable that, in order to improve energy utilization, the dissolved oxygen meter, the blower device 9 and other electrical equipment can use the electricity generated by the photovoltaic panels in the fishery photovoltaic complementary project.

[0094] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0095] The above is a detailed introduction to a fishery photovoltaic complementary tailwater purification artificial wetland provided in the embodiment of the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that: they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. An artificial wetland for purifying tail water with fishery-photovoltaic complementarity, characterized in that, it includes: A preliminary purification area, which includes a first box body, a main water inlet pipe, a branch water inlet pipe and a stirring and aerating device; Among them, the first box body is divided into an upper part of the first box body, a middle part of the first box body and a lower part of the first box body according to its height; The main water inlet pipe includes a first main water inlet pipe horizontally arranged outside the first box body and a second main water inlet pipe vertically arranged inside the first box body. The water inlet end of the second main water inlet pipe is connected to one end of the first main water inlet pipe at a right angle, and the water outlet end of the second main water inlet pipe passes through the first box body and extends into the upper part of the first box body; There are several branch water inlet pipes symmetrically arranged on both sides of the second main water inlet pipe, and the water inlet end of the branch water inlet pipe is connected to the water outlet end of the second main water inlet pipe. The water outlet end of the branch water inlet pipe extends into the upper part of the first box body or the middle part of the second box body; The stirring and aerating device is arranged at the lower part of the first box body. The stirring and aerating device includes a motor, a rotating shaft, a turntable and a strengthening unit. One end of the rotating shaft is connected to the output end of the motor, and the other end is connected to the turntable. A number of connecting rods perpendicular to it are evenly arranged on the outer edge of the turntable, and the strengthening unit is detachably suspended at both ends of the connecting rod; A first wetland area, which includes a facultative microorganism part and an anaerobic microorganism part separated horizontally. A first communication pipe is arranged at the bottom of the facultative microorganism part and is connected to the lower part of the first box body through it; Among them, fiber bundle fillers are filled in the facultative microorganism part; A first immobilized bacteria and algae filler is filled in the anaerobic microorganism part. The first immobilized bacteria and algae filler includes a first algae filler and anaerobic bacteria attached to the first algae filler. An anode rod is buried in the anaerobic microorganism part; A second wetland area, which has an aerobic microorganism part. A second communication pipe is arranged at the top of the aerobic microorganism part and is connected to the anaerobic microorganism part through it; Among them, a second immobilized bacteria and algae filler is filled in the aerobic microorganism part. The second immobilized bacteria and algae filler includes a second algae filler and aerobic bacteria attached to the second algae filler. A cathode rod is buried in the aerobic microorganism part. The cathode rod is connected to the anode rod through a wire, and a resistor is connected in series on the wire and an energy storage battery is connected in parallel; 2. The artificial wetland for purifying tail water with fishery-photovoltaic complementarity according to claim 1, characterized in that, it further includes an oxygen transmission and air purification part, which includes a second box body and a natural ventilation pipe; Among them, the second box body is separated into a mixed filler part and a water storage part by a horizontally arranged porous support plate. The mixed filler part is filled with planting soil and activated carbon, and the water storage part is a box body covered with water seepage holes; The natural ventilation pipe is densely provided with ventilation holes. The air inlet end of the natural ventilation pipe is arranged above the mixed filler part, and the air outlet end of the natural ventilation pipe passes through the mixed filler part and extends into the first box body along the upper part of the support plate.

3. The constructed wetland for purifying tail water with fishery-photovoltaic complementary as claimed in claim 2, characterized in that, the air outlet end of the natural air pipe extends in the middle of the first box body at an angle of 120° to 150°.

4. The constructed wetland for purifying tail water with fishery-photovoltaic complementary as claimed in claim 1, characterized in that, the main water inlet pipe further comprises a first precipitation part; the first precipitation part is concave and is arranged at the connection and communication part of the first main water inlet pipe and the second main water inlet pipe.

5. The constructed wetland for purifying tail water with fishery-photovoltaic complementary as claimed in claim 1, characterized in that, the main water inlet pipe further comprises settling plates, there are several settling plates and they are staggeredly arranged in the second main water inlet pipe at a preset angle in the length direction of the second main water inlet pipe.

6. The constructed wetland for purifying tail water with fishery-photovoltaic complementary as claimed in claim 1, characterized in that, the preliminary purification area further comprises a second precipitation part; the second precipitation part is a folded plate structure with a containing space, and the second precipitation part is arranged in the first box body and is located below the water inlet branch pipe.

7. The constructed wetland for purifying tail water with fishery-photovoltaic complementary as claimed in claim 1, characterized in that, the second wet area further comprises a mechanical aeration part; the mechanical aeration part is arranged in the aerobic microorganism part and an aeration device is arranged therein.

8. The constructed wetland for purifying tail water with fishery-photovoltaic complementary as claimed in claim 1, characterized in that, the strengthening unit comprises fiber filter material, hollow balls and a telescopic device; wherein, one end of the fiber filter material is connected to the connecting rod, and the other end of the fiber filter material is connected to one end of the telescopic device through a hollow ball; first through holes and second through holes are respectively arranged on the connecting sides of the hollow ball with the fiber filter material and the telescopic device, and the aperture of the first through hole is larger than that of the second through hole; the telescopic device comprises a spring and a counterweight block, one end of the spring is connected to the hollow ball, the other end is connected to the counterweight block, and a felt is sleeved outside the spring, and the felt can be extended or compressed along with the deformation of the spring.

9. The constructed wetland for purifying tail water with fishery-photovoltaic complementary as claimed in claim 1, characterized in that, the turntable is circular or regular polygon, and the turntable is connected to each connecting rod one by one with its center to be divided into several rotating units, and partition plates are arranged between adjacent rotating units.

10. The constructed wetland for purifying tail water with fishery-photovoltaic complementary as claimed in claim 1, characterized in that, it further comprises a dissolved oxygen meter and a blowing device; wherein, the dissolved oxygen meter comprises a detection end and a display end, the detection end is arranged in the first box body and extends to the lower part of the first box body, and the display end is arranged on the top of the first box body and is electrically connected to the detection end; the blowing device comprises an air delivery end and a control end, the air delivery end extends into the first box body, and the control end is arranged on the top of the first box body and is electrically connected to the air delivery end.

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