A multi-stage treatment device for aquaculture wastewater

Abstract

The present invention relates to the technical field of aquaculture sewage treatment, and specifically proposes a multi-stage aquaculture sewage treatment device, comprising: a sewage pool, a cross partition, a sedimentation tank, a collection tank, a fermentation tank one, a fermentation tank two, a rotary spray stirring mechanism, an overflow tank and a cleaning mechanism. The present invention divides the sewage pool into four parts by a cross partition, thereby realizing functional division within a limited space, and maximizing the space utilization rate of aquaculture sewage treatment in the sewage pool, and at the same time, the sediment and floating pollutants in the aquaculture sewage can be gradually removed, and the efficiency of mixing the aquaculture sewage with the composite microbial fermentation agent for fermentation can be improved, and the respective functional areas can be made not to affect each other, and the aquaculture sewage and the sprayed composite microbial fermentation agent can be fully stirred and mixed fermented through the rotary spray stirring mechanism connected to the fermentation tank one and the fermentation tank two, and the efficiency of aquaculture sewage fermentation is greatly improved by the double mixing method.

Description

Technical Field

[0001] The invention relates to the technical field of aquaculture wastewater treatment, and specifically proposes a multi-stage aquaculture wastewater treatment device. Background Art

[0002] In recent years, with the continuous development of social economy, animal husbandry has become one of the important agricultural industries. It not only brings people abundant meat, poultry, eggs and dairy products, but also brings environmental pollution problems. Breeding pollution has become the main source of agricultural pollution. The treatment of farm wastewater has become the main factor for the healthy and sustainable development of animal husbandry. In particular, farm wastewater has the "three highs" characteristics of high concentration, high ammonia nitrogen and high suspended solids, which has become an important factor affecting the sustainable development of agriculture and the safety of the ecological environment. With the improvement of environmental protection requirements, most farms have built sewage collection pools but only have storage functions, and natural fermentation is carried out through long-term storage. However, the removal rate of sediment and floating pollutants in farm wastewater is low, the treatment effect is poor, and there are risks of environmental pollution and utilization.

[0003] At present, the most economical and efficient way to achieve efficient biological fermentation treatment of farm wastewater is to use composite microbial agents, and to improve the oxidation treatment effect of farm wastewater through aeration, so as to achieve efficient biological fermentation treatment of farm wastewater. However, due to limited space, some farms are unable to build or expand facilities and equipment, which makes it difficult to achieve multi-stage treatment of discharged aquaculture wastewater, thus affecting the mixing uniformity of aquaculture wastewater and composite microbial agents. The composite microbial agents are unevenly distributed in aquaculture wastewater, affecting the overall fermentation effect and treatment efficiency. Summary of the invention

[0004] In view of the above problems, an embodiment of the present application provides a multi-stage treatment device for aquaculture wastewater to solve the technical problems in the related art.

[0005] In order to achieve the above-mentioned objectives, the embodiments of the present application provide the following technical solutions: a multi-stage treatment device for aquaculture wastewater, comprising: a sewage pool, a cross partition is arranged in the sewage pool, the cross partition divides the sewage pool into four water tanks, the four water tanks are arranged along the circumference of the center of the cross partition, namely, a sedimentation tank, a collection tank, a fermentation tank one and a fermentation tank two, and an overflow tank is provided at the top of one section of the cross partition to connect the sedimentation tank with the collection tank.

[0006] In a possible implementation, a filter screen is installed on the overflow trough, and a cleaning mechanism for cleaning the filter screen is installed on the side wall of the overflow trough.

[0007] Both fermentation tank one and fermentation tank two are equipped with a rotary spraying and stirring mechanism for rotary spraying the composite microbial fermentation agent. A rotary driving mechanism for driving the two rotary spraying and stirring mechanisms is commonly installed at the bottom of fermentation tank one and fermentation tank two. Both the collection tank and fermentation tank one are equipped with water pumps. The two water pumps are respectively used to pump water from the collection tank to the fermentation tank one and to pump water from the fermentation tank one to the fermentation tank two. An aeration disk and a dissolved oxygen sensor are provided in fermentation tank two and are connected to the aerator. Aeration can be automatically started and stopped according to the dissolved oxygen concentration to save energy and reduce emissions.

[0008] The rotary spraying and stirring mechanism includes a stirring shaft rotatably connected to the bottom of the sewage pool, a rotary stirring group is installed on the stirring shaft, two connecting frames arranged in sequence from top to bottom are connected to the stirring shaft by threaded cooperation, connecting frames are installed on the two connecting frames, connecting rods are installed between the upper and lower corresponding corners of the upper and lower connecting frames, a limiting friction reduction group arranged in sequence from top to bottom is installed on the side of the connecting rod away from the stirring shaft, a lifting and stirring assembly arranged from top to bottom and facing the axis of the stirring shaft is installed on the connecting rod, the lifting and stirring assembly is used to cooperate with the rotary stirring group, and a spraying and dispersing group is installed on the top of the stirring shaft.

[0009] A submersible water pump is installed in the second fermentation tank, and a water outlet of the submersible water pump is connected to a drainage pipe.

[0010] In one possible implementation, the spraying and dispersing group includes a dispersion hood fixedly connected to the top of the stirring shaft, the dispersion hood has an umbrella-shaped cavity structure, the lower side wall of the dispersion hood is provided with evenly arranged dispersion holes, a funnel connected to the dispersion hood is installed on the top of the dispersion hood, and the lower end surface of the dispersion hood is located below the top of the sewage pool.

[0011] In a possible implementation, the position-limiting anti-friction group includes an anti-friction wheel rotatably connected to the connecting rod through a connecting frame, and the anti-friction wheel is in a conical shape with a diameter gradually decreasing from the middle to both sides.

[0012] In one possible implementation, the rotary drive mechanism includes a moving bar slidably installed at the bottom of the sewage tank, the moving bar is located between fermentation tank one and fermentation tank two, racks are installed on both sides of the moving bar along the width direction, and the two stirring shafts pass through the sewage tank and are fixedly sleeved with gears that mesh with the corresponding racks.

[0013] In one possible implementation, the rotating stirring group includes a fixed cylinder connected between upper and lower connecting frames through a sliding connection assembly and rotating with the stirring shaft, and a spiral blade is installed on the fixed cylinder through evenly arranged connecting strips, and a fixed frame is installed between the outer wall of the spiral blade and the fixed cylinder.

[0014] In a possible implementation, the sliding connection assembly includes connecting rods installed at upper and lower ends of the fixed cylinder and rotatably connected to upper and lower connecting frames, and the inner wall of the fixed cylinder is connected to the stirring shaft by spline fitting.

[0015] In one possible implementation, the lifting and stirring assembly includes a fixed rod connected to the connecting rod and a plurality of stirring blades connected on both sides along the width direction of the fixed rod, the stirring blades are provided with V-shaped grooves symmetrically arranged up and down, and the V-shaped grooves are provided with a plurality of drainage holes evenly arranged. During the up and down movement of the stirring blades, the V-shaped grooves are used to expand the contact surface between the stirring blades and the aquaculture sewage, and the lengths of the plurality of stirring blades located on the same side of the fixed rod increase sequentially from the connecting rod toward the stirring shaft.

[0016] In one possible implementation, the cleaning mechanism includes a pull bar that is slidably connected to a cross partition and slides through the sedimentation tank and the fermentation tank 2. The pull bar is located above the upper connecting frame in the fermentation tank 2. A scraper bar evenly arranged along its length is installed on the horizontal section of the pull bar parallel to the overflow trough. The scraper bar is used to clean floating pollutants on the filter screen. A driving group that drives the pull bar to move is installed on the stirring shaft located in the fermentation tank 2, and an elastic reset part is installed between the pull bar and the sedimentation tank.

[0017] In a possible implementation, the driving group includes a support rod installed on the side wall of the stirring shaft, and one end of the support rod away from the stirring shaft is rotatably connected to a push roller.

[0018] The above one or more technical solutions in the embodiments of the present invention have at least one of the following beneficial effects: 1. A multi-stage aquaculture wastewater treatment device designed by the present invention divides the sewage pool by a cross partition, thereby realizing functional division within a limited space, and can gradually remove sediments and floating pollutants in the aquaculture wastewater, thereby improving the efficiency of the aquaculture wastewater mixed with the composite microbial fermentation agent for fermentation, and can not only make the respective functional areas not affect each other, but also can fully stir, mix and ferment the aquaculture wastewater and the sprayed composite microbial fermentation agent through the rotating spraying and stirring mechanisms connected to the fermentation tank one and the fermentation tank two, thereby greatly improving the efficiency of aquaculture wastewater fermentation through double mixing.

[0019] 2. The rotary spraying and stirring mechanism in the present invention drives the lifting and stirring components to move back and forth up and down through the rotary stirring of the rotary stirring group and the upper and lower connecting frames to stir, thereby fully mixing and stirring the aquaculture sewage and the sprayed composite microbial fermentation agent in the rectangular fermentation tank 1 and the fermentation tank 2, so that the volumes of the fermentation tank 1 and the fermentation tank 2 are maximized without affecting the full fermentation treatment of the aquaculture sewage in each of them, thereby improving the space utilization rate of the aquaculture sewage treatment in the sewage pool.

[0020] 3. In the present invention, after the composite microbial fermentation agent enters the dispersion cover from the funnel, it is dispersed along the umbrella-shaped side wall of the dispersion cover and sprinkled downward through the dispersion holes. At the same time, the dispersion cover rotates with the rotation of the rotating shaft, so that the scattered composite microbial fermentation agent is sprayed circumferentially under the rotation of the dispersion cover, thereby improving the uniformity of the spraying of the composite microbial fermentation agent and further improving the mixed fermentation effect of the composite microbial fermentation agent and aquaculture sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention.

[0023] Figure 2 The present invention Figure 1 Enlarged view of point A in .

[0024] Figure 3 It is a structural schematic diagram of the position limiting friction reducing group of the present invention.

[0025] Figure 4 It is a three-dimensional structural schematic diagram of the rotary spraying and stirring mechanism of the present invention.

[0026] Figure 5 It is a schematic diagram of the structure of the stirring blade and the V-shaped groove of the present invention.

[0027] Figure 6 It is a schematic diagram of the three-dimensional structure of the present invention cut vertically along the axes of the two stirring shafts.

[0028] Figure 7 The present invention Figure 6 Enlarged view of point B in .

[0029] Figure 8 It is a structural schematic diagram of the rotary drive mechanism of the present invention.

[0030] Fig. 9 It is a schematic diagram of the top view of the structure of the limit friction reduction group, the connecting frame and the connecting rack of the present invention.

[0031] Figure numerals: 1, sewage tank; 2, cross partition; 3, sedimentation tank; 4, collection tank; 5, fermentation tank one; 6, fermentation tank two; 7, overflow tank; 70, filter screen; 71, cleaning mechanism; 710, pulling bar; 711, scraping bar; 712, support rod; 713, push roller; 8, rotary spray stirring mechanism; 80, stirring shaft; 81, rotary stirring group; 810, fixed cylinder; 811, connecting bar; 812, spiral sheet; 813, fixed frame ; 815, connecting rod; 82, connecting frame; 83, connecting frame; 84, connecting rod; 85, limited friction reduction group; 850, connecting frame; 851, friction reduction wheel; 86, lifting and stirring assembly; 860, stirring blade; 861, V-shaped groove; 862, fixing rod; 87, spraying and dispersing group; 870, dispersing cover; 871, dispersing hole; 872, funnel; 9, rotating drive mechanism; 90, moving bar; 91, rack; 92, gear; 10, drain pipe. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] See also Figure 1 A multi-stage treatment device for aquaculture wastewater comprises: a sewage pool 1, a cross partition 2 is arranged in the sewage pool 1, the cross partition 2 divides the sewage pool 1 into four water tanks, the four water tanks are arranged along the central circumference of the cross partition 2, namely, a sedimentation tank 3, a collection tank 4, a fermentation tank 1 5 and a fermentation tank 2 6, and an overflow tank 7 is opened on the top of one section of the cross partition 2 to connect the sedimentation tank 3 with the collection tank 4.

[0035] See also Figure 1 A filter screen plate 70 is installed on the overflow trough 7, and a cleaning mechanism 71 for cleaning the filter screen plate 70 is installed on the side wall of the overflow trough 7. The filter screen plate 70 is used to filter floating pollutants in the aquaculture sewage overflowing from the sedimentation tank 3, thereby improving the efficiency of the aquaculture sewage being mixed with the composite microbial fermentation agent for fermentation. The cleaning mechanism 71 is used to clean the filter screen plate 70 to prevent the filter screen plate 70 from being blocked.

[0036] See also Figure 1 and Figure 6A rotary spraying and stirring mechanism 8 for rotary spraying the composite microbial fermentation agent is installed in both the fermentation tank 1 5 and the fermentation tank 2 6. A rotary driving mechanism 9 for driving the two rotary spraying and stirring mechanisms 8 is installed at the bottom of the fermentation tank 1 5 and the fermentation tank 2 6. A water pump is provided in the collection tank 4 and the fermentation tank 1 5. The two water pumps are used to pump the water in the collection tank 4 into the fermentation tank 1 5 and the water in the fermentation tank 1 5 into the fermentation tank 2 6 respectively. An aeration disk and a dissolved oxygen sensor are provided in the fermentation tank 2 6 and are connected to the aerator. Aeration is automatically started and stopped according to the dissolved oxygen concentration to save energy and reduce emissions.

[0037] See also Figure 1 , Figure 3 , Figure 4 and Fig. 9 The rotary spraying and stirring mechanism 8 includes a stirring shaft 80 rotatably connected to the bottom of the sewage pool 1, a rotating stirring group 81 is installed on the stirring shaft 80, two connecting frames 82 arranged from top to bottom are connected to the stirring shaft 80 by threaded matching, and connecting frames 83 are installed on the two connecting frames 82. Connecting rods 84 are installed between the upper and lower corresponding corners of the upper and lower connecting frames 83. A limiting friction reduction group 85 arranged from top to bottom is installed on the side of the connecting rod 84 away from the stirring shaft 80. A lifting stirring assembly 86 arranged from top to bottom and facing the axis of the stirring shaft 80 is installed on the connecting rod 84. The lifting stirring assembly 86 is used to cooperate with the rotating stirring group 81, and a spraying and dispersing group 87 is installed on the top of the stirring shaft 80.

[0038] See also Figure 1 A submersible water pump (not shown) is installed in the fermentation tank 2 6, and a drain pipe 10 is connected to the water outlet of the submersible water pump.

[0039] The aquaculture sewage is discharged into the sedimentation tank 3. The large particles of sediment in the aquaculture sewage enter the sedimentation tank 3 and sink to the bottom of the sedimentation tank 3. When the water level of the aquaculture sewage in the sedimentation tank 3 is higher than the overflow tank 7, the aquaculture sewage enters the collection tank 4 from the overflow tank 7, thereby realizing the primary sedimentation function of the aquaculture sewage. When the aquaculture sewage in the collection tank 4 reaches a certain amount, the aquaculture sewage in the collection tank 4 is pumped into the fermentation tank 5 through the pumping pump in the collection tank 4, thereby realizing the continuous sedimentation treatment of the aquaculture sewage and improving the treatment efficiency of the aquaculture sewage. The composite microbial fermentation agent is sprayed in the fermentation tank 5 through the spraying and dispersing group 87. At this time, the rotating drive mechanism 9 drives the stirring shaft 80 to rotate forward and reversely. During the rotation, 80 drives the rotating stirring group 81 to rotate and mix the aquaculture sewage and the composite microbial fermentation agent. At the same time, the stirring shaft 80 drives the upper and lower connecting frames 83 to move back and forth synchronously through the cooperation with the upper and lower connecting frames 82 and the upper and lower connecting frames 83. During the movement, the two connecting frames 83 drive the lifting stirring component 86 through the connecting rod 84 to mix and stir the aquaculture sewage and the composite microbial fermentation agent in the area in the fermentation tank 5 that the rotating stirring group 81 cannot stir, so that the aquaculture sewage and the composite microbial fermentation agent in the fermentation tank 5 can be fully preliminarily mixed and fermented under the cooperation of the lifting stirring component 86 and the rotating stirring group 81.

[0040] After the aquaculture sewage and the composite microbial fermentation agent in the fermentation tank 5 are initially mixed and fermented for a certain period of time, the water pump in the fermentation tank 1 5 pumps the aquaculture sewage therein to the fermentation tank 2 6, and the rotary spraying and stirring mechanism 8 in the fermentation tank 2 6 repeats the movement of the rotary spraying and stirring mechanism 8 in the fermentation tank 1 5, and the composite microbial fermentation agent is added to the aquaculture sewage again for secondary mixing and stirring.

[0041] By cooperating with the sedimentation tank 3, the collection tank 4, the fermentation tank 1 5 and the fermentation tank 2 6 in sequence, functional division can be achieved in a limited space, pollutants can be gradually removed, and the efficiency of mixed fermentation of aquaculture sewage and compound microbial fermentation agent can be improved. Moreover, the respective functional areas can be made not to affect each other, and the aquaculture sewage and the compound microbial fermentation agent can be fully mixed and fermented through the rotating spraying and stirring mechanism, which greatly improves the efficiency of aquaculture sewage fermentation and the space utilization rate during aquaculture sewage treatment.

[0042] Finally, the aquaculture wastewater in the fermentation tank 2 6 is pumped into the anaerobic fermentation bag through the submersible water pump installed in the fermentation tank 2 6, and then the fermented aquaculture wastewater is subjected to subsequent processing.

[0043] See also Figure 1 , Figure 4 and Figure 7The spraying and dispersing group 87 includes a dispersing hood 870 fixedly connected to the top of the stirring shaft 80. The dispersing hood 870 is an umbrella-shaped cavity structure. The lower side wall of the dispersing hood 870 is provided with evenly arranged dispersing holes 871. The top of the dispersing hood 870 is provided with a funnel 872 connected thereto. The lower end surface of the dispersing hood 870 is located below the top of the sewage pool 1, so as to prevent the composite microbial fermentation agent from being sprayed on an area outside the sewage pool 1 when the dispersing hood 870 rotates.

[0044] After the composite microbial fermentation agent enters the dispersion cover 870 from the funnel 872, it is dispersed along the umbrella-shaped side wall of the dispersion cover 870 and sprinkled downward through the dispersion holes 871, thereby improving the uniformity of the spreading of the composite microbial fermentation agent. At the same time, the dispersion cover 870 rotates with the rotation of the rotating shaft, so that the dispersed composite microbial fermentation agent is sprayed circumferentially under the rotation of the dispersion cover 870, further improving the uniformity of the spraying of the composite microbial fermentation agent.

[0045] See also Figure 3 and Fig. 9 The limiting friction reduction group 85 includes a friction reduction wheel 851 rotatably connected to the connecting rod 84 through a connecting frame 850. The friction reduction wheel 851 is in a conical shape with a diameter gradually decreasing from the middle to both sides. When the connecting frame 83 drives the connecting rod 84 to move up and down, the friction reduction wheel 851 rolls up and down along the corresponding corner of the fermentation tank 1 5 or the fermentation tank 2 6, which can limit the connection frame 83 to prevent the connection frame 83 from circumferential displacement with the stirring shaft 80, and can also improve the smoothness of the up and down movement of the connection frame 83.

[0046] See also Figure 6 and Figure 8 The rotating drive mechanism 9 includes a moving bar 90 slidably installed at the bottom of the sewage tank 1, and the moving bar 90 is located between the fermentation tank 1 5 and the fermentation tank 2 6. The moving bar 90 is installed with racks 91 on both sides along the width direction of the moving bar 90. After the two stirring shafts 80 pass through the sewage tank 1, they are fixedly sleeved with gears 92 that mesh with the corresponding racks 91 for transmission.

[0047] The external cylinder drives the moving bar 90 to move back and forth, and the moving bar 90 drives the stirring shaft 80 to rotate forward and reverse through the meshing transmission of the rack 91 installed thereon and the two gears 92.

[0048] See also Figure 1 , Figure 4 and Figure 6 The rotating stirring group 81 includes a fixed cylinder 810 connected between upper and lower connecting frames 82 through a sliding connection assembly and rotates with the stirring shaft 80. A spiral piece 812 is installed on the fixed cylinder 810 through evenly arranged connecting strips 811, and a fixed frame 813 is installed between the outer wall of the spiral piece 812 and the fixed cylinder 810.

[0049] See also Figure 1 , Figure 4 , Figure 6 and Figure 7 The sliding connection assembly includes a connecting rod 815 installed at the upper and lower ends of the fixed cylinder 810 and rotatably connected to the upper and lower connecting frames 82. The inner wall of the fixed cylinder 810 is connected to the stirring shaft 80 by spline matching.

[0050] See also Figure 4 and Figure 5 The lifting stirring assembly 86 includes a fixed rod 862 connected to the connecting rod 84 and a plurality of stirring blades 860 connected on both sides along the width direction of the fixed rod 862. The stirring blades 860 are provided with V-shaped grooves 861 symmetrically arranged up and down, and the V-shaped grooves 861 are provided with a plurality of drainage holes evenly arranged. During the up and down movement of the stirring blades 860, the V-shaped grooves 861 are used to expand the contact surface between the stirring blades 860 and the aquaculture sewage. The lengths of the plurality of stirring blades 860 located on the same side of the fixed rod 862 increase sequentially from the connecting rod 84 to the stirring shaft 80.

[0051] During the rotation, the stirring shaft 80 drives the fixed cylinder 810 to rotate by means of spline cooperation. The fixed cylinder 810 drives the spiral piece 812 to rotate through the connecting strip 811. The spiral piece 812 rotates with the connecting strip 811 and the fixed frame 813 to perform circumferential rotation stirring. The rotation of the stirring shaft 80 drives the connecting frame 83, the fixed rod 862 and the stirring piece 860 to move up and down by means of thread cooperation. The stirring piece 860 cooperates with the fixed rod 862 and the connecting frame 83 to stir up and down the areas at the four corners in the fermentation tank 1 5 or the fermentation tank 2 6 that are not stirred by the spiral piece 812. During the movement of the upper and lower connecting frames 82, the fixed cylinder 810 and the spiral piece 812 are driven up and down by the connecting rod 815, so that the aquaculture sewage and the composite microbial fermentation agent can be stirred circumferentially and mixed and stirred up and down, so that the aquaculture sewage and the composite microbial fermentation agent in the fermentation tank 1 5 and the fermentation tank 2 6 can be fully mixed and stirred while maximizing the volume of the fermentation tank 1 5 and the fermentation tank 2 6.

[0052] See also Figure 1 The cleaning mechanism 71 includes a pull bar 710 which is slidably connected to the cross partition 2 and slides through the sedimentation tank 3 and the fermentation tank 6. The pull bar 710 is located above the upper connecting frame 83 in the fermentation tank 6. The pull bar 710 is installed with a scraper bar 711 evenly arranged along its length direction on the horizontal section parallel to the overflow trough 7. The scraper bar 711 is used to clean the floating pollutants on the filter screen plate 70. A driving group for driving the pull bar 710 to move is installed on the stirring shaft 80 located in the fermentation tank 6. An elastic reset part is installed between the pull bar 710 and the sedimentation tank 3.

[0053] See also Figure 2 and Figure 6 The driving group includes a support rod 712 installed on the side wall of the stirring shaft 80, and one end of the support rod 712 away from the stirring shaft 80 is rotatably connected to a push roller 713.

[0054] During the forward and reverse rotation of the stirring shaft 80, the support rod 712 drives the push roller 713 to reciprocate along the circumference of the stirring shaft 80. When the push roller 713 contacts the pull bar 710 during the circumferential rotation of the stirring shaft 80, it drives the pull bar 710 to move. The pull bar 710 drives the scraper bar 711 to clean the floating pollutants filtered on the filter screen plate 70.

[0055] During operation, the aquaculture sewage is discharged into the sedimentation tank 3, and the large particles of sediment in the aquaculture sewage enter the sedimentation tank 3 and sink to the bottom of the sedimentation tank 3. When the water level of the aquaculture sewage in the sedimentation tank 3 is higher than the overflow tank 7, the aquaculture sewage enters the collection tank 4 from the overflow tank 7, thereby realizing the primary sedimentation function of the aquaculture sewage.

[0056] When the aquaculture sewage in the collection tank 4 reaches a certain amount, the aquaculture sewage in the collection tank 4 is pumped into the fermentation tank 5 through the water pump in the collection tank 4, so as to realize the continuous sedimentation treatment of the aquaculture sewage and improve the treatment efficiency of the aquaculture sewage. The composite microbial fermentation agent is sprayed in the fermentation tank 5 through the spraying and dispersion group 87. At this time, the rotary drive mechanism 9 drives the stirring shaft 80 to rotate forward and reverse. During the rotation, the stirring shaft 80 drives the rotating stirring group 81 to rotate to mix and stir the aquaculture sewage and the composite microbial fermentation agent. At the same time, the stirring shaft 80 drives the upper and lower connecting frames 82 and the upper and lower connecting frames 83 to move up and down synchronously through its cooperation with the upper and lower connecting frames 83, so that the aquaculture sewage and the composite microbial fermentation agent in the fermentation tank 5 are fully preliminarily mixed and fermented under the cooperation of the lifting stirring component 86 and the rotating stirring group 81.

[0057] When the initial mixing and fermentation of the aquaculture sewage and the composite microbial fermentation agent in the fermentation tank 5 is completed, the water pump in the fermentation tank 15 pumps the aquaculture sewage into the fermentation tank 2 6, and the rotary spraying and stirring mechanism 8 in the fermentation tank 2 6 repeats the movement of the rotary spraying and stirring mechanism 8 in the fermentation tank 1 5, and the composite microbial fermentation agent is added to the aquaculture sewage again for secondary mixing and stirring.

[0058] Finally, the aquaculture wastewater in the fermentation tank 2 6 is pumped into the anaerobic fermentation bag through the submersible water pump installed in the fermentation tank 2 6, and then the fermented aquaculture wastewater is subjected to subsequent processing.

[0059] In the description of the present invention, it is necessary to understand that the terms "length", "width", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as a limitation on the present invention.

[0060] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-stage aquaculture wastewater treatment device, characterized in that: include: A sewage pool (1), wherein a cross partition (2) is arranged in the sewage pool (1), the cross partition (2) divides the sewage pool (1) into four water tanks, the four water tanks are arranged in a circumferential direction along the center of the cross partition (2), and are a sedimentation tank (3), a collection tank (4), a fermentation tank 1 (5) and a fermentation tank 2 (6), and an overflow tank (7) is provided at the top of one section of the cross partition (2) to connect the sedimentation tank (3) with the collection tank (4); A rotary spraying and stirring mechanism (8) for rotary spraying the composite microbial fermentation agent is installed in both the first fermentation tank (5) and the second fermentation tank (6), and a rotary driving mechanism (9) for driving the two rotary spraying and stirring mechanisms (8) is installed at the bottom of the first fermentation tank (5) and the second fermentation tank (6); The rotary spray stirring mechanism (8) comprises a stirring shaft (80) rotatably connected to the bottom of the sewage pool (1), a rotary stirring group (81) being mounted on the stirring shaft (80), two connecting frames (82) arranged in sequence from top to bottom being connected to the stirring shaft (80) by means of threaded engagement, connecting frames (83) being mounted on both connecting frames (82), connecting rods (84) being mounted between upper and lower corresponding corners of the upper and lower connecting frames (83), a limiting friction reduction group (85) being arranged in sequence from top to bottom being mounted on the side of the connecting rod (84) away from the stirring shaft (80), a lifting stirring assembly (86) being arranged in sequence from top to bottom and facing the axis of the stirring shaft (80) being mounted on the connecting rod (84), the lifting stirring assembly (86) being used to cooperate with the rotary stirring group (81), and a spray dispersion group (87) being mounted on the top of the stirring shaft (80); The lifting stirring assembly (86) comprises a fixed rod (862) connected to the connecting rod (84) and a plurality of stirring blades (860) arranged along the width direction of the fixed rod (862) and connected on both sides, wherein the lengths of the plurality of stirring blades (860) located on the same side of the fixed rod (862) increase sequentially from the connecting rod (84) toward the stirring shaft (80); The rotary stirring group (81) comprises a fixed cylinder (810) connected between upper and lower connecting frames (82) via a sliding connection assembly and rotating along with the stirring shaft (80); a spiral sheet (812) is mounted on the fixed cylinder (810) via evenly arranged connecting strips (811); and a fixed frame (813) is mounted between the outer side wall of the spiral sheet (812) and the fixed cylinder (810); The spraying and dispersing group (87) comprises a dispersing cover (870) fixedly connected to the top of the stirring shaft (80); the dispersing cover (870) is in an umbrella-shaped cavity structure; the lower side wall of the dispersing cover (870) is provided with evenly arranged dispersing holes (871); the top of the dispersing cover (870) is provided with a funnel (872) connected thereto; and the lower end surface of the dispersing cover (870) is located below the top of the sewage pool (1); A submersible water pump is installed in the second fermentation tank (6), and the water outlet of the submersible water pump is connected to a drainage pipe (10).

2. A multi-stage aquaculture wastewater treatment device according to claim 1, characterized in that: The stirring blade (860) is provided with a V-shaped groove (861) which is symmetrically arranged up and down, and the V-shaped groove (861) is provided with a plurality of drainage holes which are evenly arranged.

3. A multi-stage aquaculture wastewater treatment device according to claim 1, characterized in that: A filter screen plate (70) is installed on the overflow trough (7), and a cleaning mechanism (71) for cleaning the filter screen plate (70) is installed on the side wall of the overflow trough (7).

4. The multi-stage aquaculture wastewater treatment device according to claim 1, characterized in that: The rotary drive mechanism (9) comprises a moving bar (90) slidably mounted at the bottom of the sewage tank (1), the moving bar (90) being located between the first fermentation tank (5) and the second fermentation tank (6), racks (91) being mounted on both sides of the moving bar (90) along its width direction, and two stirring shafts (80) passing through the sewage tank (1) are fixedly sleeved with gears (92) meshing with the corresponding racks (91) for transmission.

5. The multi-stage aquaculture wastewater treatment device according to claim 3 is characterized in that: The cleaning mechanism (71) comprises a pull bar (710) which is slidably connected to the cross partition (2) and slides through the sedimentation tank (3) and the second fermentation tank (6); the pull bar (710) is located above the upper connecting frame (83) inside the second fermentation tank (6); a scraper bar (711) evenly arranged along its length is installed on the horizontal section of the pull bar (710) parallel to the overflow trough (7); a driving group for driving the pull bar (710) to move is installed on the stirring shaft (80) located in the second fermentation tank (6); and an elastic reset member is installed between the pull bar (710) and the sedimentation tank (3).

6. The multi-stage aquaculture wastewater treatment device according to claim 1, characterized in that: The sliding connection assembly comprises connecting rods (815) mounted at the upper and lower ends of the fixed cylinder (810) and rotatably connected to the upper and lower connecting frames (82); the inner wall of the fixed cylinder (810) and the stirring shaft (80) are connected by spline fitting.

7. The multi-stage aquaculture wastewater treatment device according to claim 1, characterized in that: The position-limiting friction-reducing group (85) comprises a friction-reducing wheel (851) rotatably connected to the connecting rod (84) via a connecting frame (850); the friction-reducing wheel (851) is in a conical shape with a diameter gradually decreasing from the middle to both sides.

8. The multi-stage aquaculture wastewater treatment device according to claim 5, characterized in that: The driving group comprises a support rod (712) installed on the side wall of the stirring shaft (80), and one end of the support rod (712) away from the stirring shaft (80) is rotatably connected to a push roller (713).

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