Treatment device capable of treating mixed liquid of aquaculture wastewater and domestic sewage

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a treatment device capable of treating mixed liquid of aquaculture wastewater and domestic sewage, which comprises a grating tank, coarse and fine gratings are arranged in the grating tank, and one end of the grating tank is fixedly connected with a grating tank water outlet pipe. Through the combination of a first steam stripping mechanism, a second steam stripping mechanism, a third steam stripping mechanism and a deep hydrolysis acidification pool, the characteristics of high turbidity and high fluctuation of a mixed solution are effectively handled, the COD pretreatment removal rate reaches 20-50%, the problem of overload treatment load of existing general equipment is solved, and a first biochemical module and a second biochemical module are light in weight, small in size and convenient to carry on a narrow road; and the first biochemical module and the second biochemical module are detachably and modularly spliced through a pipeline, so that the later-stage non-transformation capacity expansion is realized, the requirement of gradually expanding the breeding scale is met, and compared with fixed equipment, the capacity expansion cost is reduced by more than 50%.

Description

A treatment device for treating a mixture of aquaculture wastewater and domestic sewage. Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a treatment device that can treat a mixture of aquaculture wastewater and domestic sewage. Background Technology

[0002] Wastewater treatment processes refer to various economical, rational, scientific, and effective methods for treating urban domestic sewage and industrial wastewater. Wastewater treatment is widely used in various fields such as construction, agriculture, transportation, energy, petrochemicals, environmental protection, urban landscaping, medical care, and catering. The optimal urban wastewater treatment process should be selected based on a comprehensive technical and economic comparison, taking into account the treatment scale, water quality characteristics, environmental function of the receiving water body, and local conditions and requirements.

[0003] In existing technologies, mixed wastewater from livestock farming and domestic sewage is characterized by high COD, large fluctuations, high suspended solids, and high nitrogen and phosphorus concentrations. Conventional integrated equipment has the following problems:

[0004] 1. Relying on mains electricity, it cannot adapt to mountainous areas without electricity;

[0005] 2. The equipment is large in size and difficult to transport;

[0006] 3. Prone to freezing in winter, causing operational interruptions;

[0007] 4. High failure rate and difficult maintenance;

[0008] 5. Expansion requires rebuilding, which is costly. Summary of the Invention

[0009] In view of the above-mentioned shortcomings of the prior art, the present invention provides a treatment device for treating a mixture of aquaculture wastewater and domestic sewage, which can effectively solve the problems mentioned in the prior art.

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] This utility model provides a treatment device for treating a mixture of aquaculture wastewater and domestic sewage, including a bar screen tank with coarse and fine bar screens. One end of the bar screen tank is fixedly connected to a bar screen tank outlet pipe, one end of the bar screen tank outlet pipe is fixedly connected to a collection tank, one end of the collection tank is fixedly connected to a collection tank outlet pipe, one end of the collection tank outlet pipe is fixedly connected to a deep hydrolysis acidification tank, one end of the deep hydrolysis acidification tank outlet pipe is fixedly connected to a first biochemical module, one end of the first biochemical module is fixedly connected to a second biochemical module, one end of the second biochemical module is fixedly connected to a biochemical module outlet pipe, one end of the biochemical module outlet pipe is fixedly connected to an artificial wetland, and one end of the artificial wetland is fixedly connected to an artificial wetland drainage pipe.

[0012] Furthermore, it also includes an energy supply unit, which consists of a control cabinet, a photovoltaic panel, an intelligent controller, a DC air pump, and an energy storage battery. The control cabinet is located outside the first biochemical module. The intelligent controller, the DC air pump, and the energy storage battery are all fixedly connected inside the control cabinet. The photovoltaic panel is fixedly connected to the upper end of the control cabinet. The DC air pump is fixedly connected to and communicates with the first biochemical module.

[0013] Furthermore, multiple spacers are fixedly connected within the first biochemical module, and each of the multiple spacers has a water-permeable hole at one end.

[0014] Furthermore, a first aeration disc is fixedly connected inside the first biochemical module, and a second aeration disc is fixedly connected inside the second biochemical module. Both the first and second aeration discs are fixedly connected and communicate with a DC air pump.

[0015] Furthermore, the collection pool, the collection pool outlet pipe, and the first biochemical module are respectively equipped with a first stripping mechanism, a second stripping mechanism, and a third stripping mechanism.

[0016] Furthermore, a booster pump is fixedly connected within the second biochemical module, and the booster pump is fixedly connected and communicated with the deep hydrolysis acidification tank via a pipeline.

[0017] Furthermore, the booster pump is equipped with a double-layer PE perforated water distribution pipe.

[0018] Furthermore, the constructed wetland is constructed by laying an aquatic plant layer, a filler layer, and a gravel layer from top to bottom.

[0019] Beneficial effects

[0020] The technical solution provided by this utility model has the following advantages compared with the known prior art:

[0021] I. By combining a first stripping mechanism, a second stripping mechanism, a third stripping mechanism, and a deep hydrolysis acidification tank, the system effectively addresses the high turbidity and high volatility characteristics of the mixed liquor, achieving a COD pretreatment removal rate of 20-50%. This solves the problem of overload in existing general-purpose equipment. The first and second biochemical modules are lightweight and compact, facilitating transport in narrow roads. Furthermore, the modular design of the first and second biochemical modules allows for detachable and modular expansion without subsequent modifications, adapting to the needs of gradually expanding aquaculture scales. Compared to fixed equipment, the expansion cost is reduced by more than 50%.

[0022] 2. The double-layer water distribution and subsurface flow switching design of the post-constructed wetland drainage pipe, combined with filler and plant insulation, maintains a treatment efficiency of over 70% in winter in northern mountainous areas, completely solving the pain point of traditional wetlands freezing and failing in winter.

[0023] Third, the supporting energy supply unit is adapted to scenarios without power grid, and the structure is simplified by sharing a power source. Combined with intelligent control strategies, it ensures continuous operation on rainy days and when energy is insufficient, and the operating cost is reduced by 60-80% compared with grid-powered drive. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 is a front perspective view of this utility model;

[0026] Figure 2 is a perspective view of the main cross-section of this utility model;

[0027] Figure 3 is a sectional perspective view of the control cabinet of this utility model;

[0028] Figure 4 is a sectional perspective view of the artificial wetland of this utility model.

[0029] Reference numerals: 1. Photovoltaic panel; 2. Intelligent controller; 3. DC air pump; 4. Energy storage battery; 5. Grille tank; 6. Grille tank outlet pipe; 7. Collection tank; 71. First stripping mechanism; 8. Collection tank outlet pipe; 9. Deep hydrolysis acidification tank; 91. Second stripping mechanism; 10. Deep hydrolysis acidification tank outlet pipe; 11. First biochemical module; 111. First aeration disc; 112. Third stripping mechanism; 113. Second aeration disc; 12. Biochemical module outlet pipe; 13. Constructed wetland; 131. Gravel layer; 132. Packing layer; 133. Aquatic plant layer; 14. Constructed wetland drainage pipe; 114. Lift pump; 15. Control cabinet; 16. Second biochemical module. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0031] The present invention will be further described below with reference to the embodiments.

[0032] Referring to Figures 1-4, a treatment device for treating a mixture of aquaculture wastewater and domestic sewage includes a bar screen 5, which is equipped with coarse and fine bar screens. One end of the bar screen 5 is fixedly connected to a bar screen outlet pipe 6, and one end of the bar screen outlet pipe 6 is fixedly connected to a collection tank 7. One end of the collection tank 7 is fixedly connected to a collection tank outlet pipe 8, and one end of the collection tank outlet pipe 8 is fixedly connected to a deep hydrolysis acidification tank 9. One end of the deep hydrolysis acidification tank 9 is fixedly connected to a deep hydrolysis acidification tank outlet pipe 10, and one end of the deep hydrolysis acidification tank outlet pipe 10 is fixedly connected to a first biochemical module 11. One end of the first biochemical module 11 is fixedly connected to a second biochemical module 16, and one end of the second biochemical module 16 is fixedly connected to a biochemical module outlet pipe 12. One end of the biochemical module outlet pipe 12 is fixedly connected to an artificial wetland 13, and one end of the artificial wetland 13 is fixedly connected to an artificial wetland drainage pipe 14.

[0033] The first stripping mechanism 71, the second stripping mechanism 91, and the third stripping mechanism 112 are respectively installed in the collection tank 7, the collection tank outlet pipe 8, and the first biochemical module 11;

[0034] The first biochemical module 11 is fixedly connected to multiple partition plates, and each of the multiple partition plates has a water-permeable hole at one end.

[0035] A first aeration disc 111 is fixedly connected inside the first biochemical module 11, and a second aeration disc 113 is fixedly connected inside the second biochemical module 16. Both the first aeration disc 111 and the second aeration disc 113 are fixedly connected to and communicate with the DC air pump 3.

[0036] The booster pump 114 is equipped with a double-layer PE perforated water distribution pipe. The artificial wetland 13 is formed by laying a water plant layer 133, a filler layer 132 and a gravel layer 131 from top to bottom.

[0037] In a specific embodiment of this utility model, the bar screen 5 serves as the first pretreatment unit and adopts a series design of coarse and fine double-layer bar screens. The coarse bar screen has a grid spacing of 10-20mm and mainly intercepts large solid impurities such as branches, stones, and livestock waste. The fine bar screen has a grid spacing of 2-5mm and further filters fine suspended solids and flocculent matter. The bar screen is made of 304 stainless steel, which has the characteristics of corrosion resistance, high strength, and easy cleaning. A sludge discharge hopper is set at the bottom of the tank, which can periodically discharge sludge manually or automatically, effectively reducing the risk of blockage and operating load of subsequent treatment units.

[0038] After the wastewater is filtered by the grit chamber 5, it is transferred to the collection tank 7 through the grit chamber outlet pipe 6. The collection tank 7 is a core auxiliary unit designed to address the problems of uneven mixed liquor quality and sediment accumulation, replacing the traditional water pump return structure. The tank is equipped with a first stripping mechanism 71, which includes a gas distributor and a return pipe. The annular gas distributor is installed at the bottom of the tank 20cm from the edge. It is a perforated pipe structure with a perforation diameter of 2-4mm, a hole spacing of 10-15mm, and an upward direction, which can make the gas released evenly to form dense bubbles.

[0039] One end of the return pipe is connected to the effluent area of ​​the collection tank 7, and the other end extends tangentially along the tank wall to the influent area. During operation, the DC air pump 3 delivers gas and releases it through the distributor. The stripping effect drives 25-35% of the water volume to flow tangentially back along the return pipe, which not only achieves homogeneous dilution of the mixed liquid, but also avoids siltation and caking by impacting the sediment at the bottom of the tank through tangential water flow, thus ensuring the stability of the influent water quality of the subsequent treatment unit.

[0040] The water from the collection tank 7 is then transferred to the deep hydrolysis acidification tank 9 via the collection tank outlet pipe 8. The deep hydrolysis acidification tank 9 is a pretreatment enhancement unit designed to meet the requirements for removing recalcitrant organic matter in the mixed liquor. It adopts a composite packing system of "aquatic plant bio-rope + suspended ball packing". The aquatic plant bio-rope has a diameter of 8-12mm and is suspended at a density of 20-30 ropes / m². Its three-dimensional mesh structure provides sufficient attachment space for microorganisms. The suspended ball packing is made of polyethylene with a diameter of 80mm. It is loaded with anaerobic microbial agents containing acid-producing bacteria and hydrolytic bacteria. The filling rate is 30-50% of the tank volume. When the mixed liquor flows through this tank, recalcitrant organic matter such as lignin and long-chain fatty acids are converted into easily biodegradable small molecules under the action of microorganisms. The COD removal rate is stable at 20-50%, which greatly reduces the load of subsequent biochemical treatment.

[0041] Similarly, after complete filtration, the effluent is transferred to the first biochemical module 11 through the effluent pipe 10 of the deep hydrolysis acidification tank. The first biochemical module 11 is the core processing unit, manufactured using standardized modules of molded SMC sheet molding compound to meet the needs of transportation and expansion in mountainous areas. The dimensions of a single module are 2.15m * 1.15m * 1.65m (length × width × height), and its weight is only 1 / 3 of that of a carbon steel device of the same volume, facilitating transportation through narrow mountain roads. The process can be flexibly combined according to the nitrogen and phosphorus content of the mixed solution. The first biochemical module 11 is divided into basic modules by partitions, which consist of an "anaerobic tank". →Anoxic tank →Aerobic tank →Sedimentation tank”, which can be expanded to form AAO, AAOO or AOAO denitrification and phosphorus removal processes. The first biochemical module 11 and the second biochemical module 16 are connected by detachable pipes, which are convenient to install and have strong sealing. The first aeration disc 111 is arranged in the aerobic tank and the second aeration disc 113 is set in the second biochemical module 16 to provide sufficient dissolved oxygen for microorganisms. When the water volume increases due to the expansion of the breeding scale, the corresponding functional modules can be added directly and quickly spliced ​​through pipes without modifying the original pipeline system, reducing the expansion cost by more than 50%.

[0042] After the wastewater enters the second biological treatment module 16, it is transferred outward through a clear water tank separated by a partition within the module 16, and then through the biological treatment module outlet pipe 12 to the constructed wetland 13. The constructed wetland 13 is a deep treatment unit adapted for the low temperatures of winter in northern mountainous areas. It adopts a collaborative design of "double-layer water distribution + composite filler + low-temperature resistant plants". The tank is 1.5m deep, and inside, from top to bottom, it is laid with 10cm of planting soil as the second aeration disc 113, 50-80cm of filler layer 132 (ceramsite or volcanic rock), and 30-50cm of gravel layer 131. The porous structure of the filler layer 132 and the gravel layer 131 ensures smooth water flow. It can intercept pollutants and provide a habitat for microorganisms. The plants planted in the 133 aquatic plant layer are selected from low-temperature resistant varieties such as reeds, cattails, or calamus. Their roots can absorb nitrogen and phosphorus and enhance water disturbance. The water distribution system adopts a double-layer PE perforated pipe with a +0.0m surface flow and a -1.0m subsurface flow. The perforation diameter is 3-5mm and the hole spacing is 15-20mm. The perforation direction is inclined downward at 45° to the horizontal to effectively avoid blockage. In summer, the surface flow and subsurface flow combined mode is used to improve oxygen transfer efficiency. In winter, the surface water distribution pipe is closed and only the -1.0m subsurface flow mode is operated. The constant temperature environment of ≥5℃ underground is used to maintain the operation of the system and avoid freezing failure.

[0043] Please refer to Figures 1-4 for details. It also includes an energy supply unit, which consists of a control cabinet 15, a photovoltaic panel 1, an intelligent controller 2, a DC air pump 3, and an energy storage battery 4. The control cabinet 15 is located outside the first biochemical module 11. The intelligent controller 2, the DC air pump 3, and the energy storage battery 4 are all fixedly connected inside the control cabinet 15. The photovoltaic panel 1 is fixedly connected to the upper end of the control cabinet 15. The DC air pump 3 is fixedly connected to and communicates with the first biochemical module 11.

[0044] In this embodiment, the energy supply unit designed to adapt to off-grid scenarios includes a photovoltaic panel 1, an intelligent controller 2, and an energy storage battery 4. This system directly supplies power to the DC air pump 3, enabling the first stripping mechanism 71, the second stripping mechanism 91, and the third stripping mechanism 112 to operate effectively with the first aeration disc 111 and the second aeration disc 113 in the first biochemical module 11 and the second biochemical module 16. No inverter conversion is required, reducing power loss. The intelligent controller 2 can dynamically adjust the operating mode according to the remaining power of the energy storage battery 4 to ensure stable processing under energy-limited conditions.

[0045] Please refer to Figures 1-4 for details. A booster pump 114 is fixedly connected inside the second biochemical module 16. The booster pump 114 is fixedly connected and communicated with the deep hydrolysis acidification tank 9 through a pipeline.

[0046] In this embodiment: When the second biochemical module 16 is in daily use, if the amount of water to be processed is small, the liquid in its internal clear water tank will still be returned by air lift and the liquid will be returned to the collection tank 7. However, if the amount of water to be processed is large, the front-end collection tank 7 and the deep hydrolysis acidification tank 9 are relatively large, and there are many first biochemical modules 11 and second biochemical modules 16, and the distance is relatively far, then additional lift pump 114 can be used for lift and return.

[0047] Working principle: The mixture of aquaculture wastewater and domestic sewage first enters the screen tank 5. After the solid impurities are intercepted by the double screen, it flows into the collection tank 7 by gravity. 25-35% of the water volume is tangentially refluxed under the stripping effect to achieve water homogenization and sediment agitation.

[0048] The mixture then enters the deep hydrolysis acidification tank 9, where the recalcitrant organic matter is converted into small molecules and COD is initially removed.

[0049] The treated mixed liquor flows by gravity into the first biological module 11, and then passes through the anaerobic tank, the anoxic tank for denitrification, the aerobic tank for nitrification, and the sedimentation tank for sludge-water separation, to achieve deep degradation of organic matter and nitrogen and phosphorus.

[0050] After the supernatant is temporarily stored in the clear water tank, it flows into the post-constructed wetland 13, where it is filtered by packing material, adsorbed by plants and purified by microorganisms before being discharged or reused in compliance with standards.

[0051] Throughout the process, the solar power system provides power to the DC air pump 3, and the intelligent controller 2 ensures stable operation in scenarios with insufficient energy, such as rainy days.

[0052] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A treatment device for treating a mixture of aquaculture wastewater and domestic sewage, comprising a grid pool (5), characterized in that: The grid pool (5) is equipped with coarse and fine grids. One end of the grid pool (5) is fixedly connected to the grid pool outlet pipe (6). One end of the grid pool outlet pipe (6) is fixedly connected to the collection pool (7). One end of the collection pool (7) is fixedly connected to the collection pool outlet pipe (8). One end of the collection pool outlet pipe (8) is fixedly connected to the deep hydrolysis acidification pool (9). One end of the deep hydrolysis acidification pool (9) is fixedly connected to the deep hydrolysis acidification pool outlet pipe (10). One end of the deep hydrolysis acidification pool outlet pipe (10) is fixedly connected to the first biochemical module (11). One end of the first biochemical module (11) is fixedly connected to the second biochemical module (16). One end of the second biochemical module (16) is fixedly connected to the biochemical module outlet pipe (12). One end of the biochemical module outlet pipe (12) is fixedly connected to the artificial wetland (13). One end of the artificial wetland (13) is fixedly connected to the artificial wetland drainage pipe (14).

2. The treatment device according to claim 1, wherein It also includes an energy supply unit, which consists of a control cabinet (15), a photovoltaic panel (1), an intelligent controller (2), a DC air pump (3), and an energy storage battery (4). The control cabinet (15) is located outside the first biochemical module (11). The intelligent controller (2), the DC air pump (3), and the energy storage battery (4) are all fixedly connected inside the control cabinet (15). The photovoltaic panel (1) is fixedly connected to the upper end of the control cabinet (15). The DC air pump (3) is fixedly connected to and communicates with the first biochemical module (11).

3. The treatment device for treating a mixture of aquaculture wastewater and domestic sewage according to claim 2, characterized in that, The first biochemical module (11) is fixedly connected with multiple spacers, and each of the multiple spacers has a water-permeable hole at one end.

4. The treatment device according to claim 3, wherein The first biochemical module (11) is fixedly connected to a first aeration disc (111), and the second biochemical module (16) is fixedly connected to a second aeration disc (113). The first aeration disc (111) and the second aeration disc (113) are both fixedly connected to and communicate with a DC air pump (3).

5. The treatment device according to claim 4, wherein The collection pool (7), the collection pool outlet pipe (8), and the first biochemical module (11) are respectively equipped with a first stripping mechanism (71), a second stripping mechanism (91), and a third stripping mechanism (112).

6. The treatment device according to claim 5, wherein The second biochemical module (16) is fixedly connected to a booster pump (114), which is fixedly connected and connected to the deep hydrolysis acidification tank (9) through a pipeline.

7. The treatment device according to claim 6, wherein The booster pump (114) is equipped with a double-layer PE perforated water distribution pipe.

8. The treatment device according to claim 7, wherein The artificial wetland (13) is constructed from top to bottom by a layer of aquatic plants (133), a layer of filler (132), and a layer of gravel (131).

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