Multi-stage AAO rural domestic sewage treatment device and method

Abstract

The invention discloses a multistage AAO rural domestic sewage treatment device and method, and belongs to the technical field of domestic sewage treatment, the multistage AAO rural domestic sewage treatment device comprises a filter unit and a plurality of water supply units, the filter unit is communicated with an anaerobic tank through one water supply unit, the anaerobic tank is communicated with an anoxic tank through one water supply unit, and a gas pressure regulating tank is assembled on the anoxic tank; through the arranged compression unit, when a pressing plate is moved downwards through an electric hydraulic rod to compress collected waste, a lower baffle can be driven to move downwards together, the outlet end of a filtering piece is blocked, normal filtering can be guaranteed in the compression period, meanwhile, the waste does not continue to fall off, and the practicability is high. And meanwhile, after the collecting box is full of waste, the upper baffle can move upwards by moving the pressing plate upwards to block the Y-shaped flow dividing pipe, so that in the waste pouring period, even if a person pours sewage, the sewage cannot flow into the box, and the situation that the sewage is splashed all around is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of domestic sewage treatment, and in particular to a multi-stage AAO rural domestic sewage treatment device and method. Background Art

[0002] As the source of human life, water plays an indispensable role in the development of human society. With the improvement of the quality of life, domestic sewage is becoming one of the sources of water pollution, and rural domestic sewage is gradually becoming one of the main reasons for aggravating agricultural pollution.

[0003] The existing sewage treatment device / process based on multi-stage AAO (anaerobic + anoxic + aerobic) has low resource utilization rate, resulting in high energy consumption and poor treatment effect. At the same time, during the treatment, the waste intercepted by the filter element will be collected through the collection box, and in order to increase the collection volume, the waste in the box will be compressed to reduce the occupied space. During the compression process, sewage often still flows, which makes the waste continue to flow into the box, bringing difficulties to the compression work. At the same time, when dumping waste, it is impossible to control people from dumping sewage, which makes it easy for sewage to flow in during the dumping of waste, resulting in splashing and pollution. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that sewage often still flows during the compression process, causing waste to continuously flow into the box, bringing difficulties to the compression work, and at the same time, when dumping waste, it is impossible to control personnel from dumping sewage, which leads to sewage easily flowing in during the dumping of waste, thereby causing splashing and pollution. A multi-stage AAO rural domestic sewage treatment device and method are proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A multi-stage AA rural domestic sewage treatment device, comprising a filter unit and a plurality of water supply units, wherein the filter unit is connected to an anaerobic tank via one of the water supply units, the anaerobic tank is connected to an anoxic tank via one of the water supply units, and the anoxic tank is equipped with a gas pressure regulating tank;

[0007] The anoxic tank is connected to the aerobic tank via one of the water supply units, the aerobic tank is connected to the primary sedimentation tank via one of the water supply units, and the primary sedimentation tank is connected to the secondary sedimentation tank via one of the water supply units;

[0008] The filter unit comprises an outer box and a water inlet pipe mounted on the outer box, an inclined filter is mounted on the inner wall of the outer box, a guide bucket is mounted on the bottom ends of the plurality of filters, a collecting box connected to the guide bucket is detachably fixed at the bottom of the inner cavity of the outer box, and a compression unit is mounted on the guide bucket;

[0009] The compression unit includes an electric hydraulic rod and a pressure plate mounted on the end of the electric hydraulic rod, an upper positioning sleeve and a lower positioning sleeve are fixed to the guide bucket and the inner wall of the outer box respectively, a lower baffle for blocking the falling of solid waste is plugged into the bottom of the upper positioning sleeve and the lower positioning sleeve, and an upper baffle for blocking the falling of sewage is plugged into the top of the upper positioning sleeve;

[0010] The pressing plate moves downward under the drive of the electric hydraulic rod, and drives the lower baffle to block the outlet end of the filter element, so that when the pressing plate presses down the waste collected in the collection box, the solid waste left after the normal filtration of the sewage can be temporarily blocked.

[0011] As a further description of the above technical solution:

[0012] The interior of the pressure plate is connected to an extension plate via a first spring, and the bottom of the inner side of the lower baffle is rotatably connected to a support bar that matches the end of the extension plate via a U-shaped seat, and a torsion spring is sleeved at the rotatable connection between the support bar and the U-shaped seat, so that the support bar can only rotate from a horizontal state to a vertical state and can be reset to a horizontal state.

[0013] As a further description of the above technical solution:

[0014] A second spring is fixed to the top of the lower baffle plate, the lower baffle plate located at the bottom is installed in the lower positioning sleeve through the second spring, and the lower baffle plate located at the top is installed in the upper positioning sleeve through the second spring. A first retraction cavity is opened at the top of one side of the lower baffle plate, and a clamping block is connected to the first retraction cavity through a third spring. The bottom of the inner side of the upper positioning sleeve and the lower positioning sleeve are both provided with clamping grooves adapted to the clamping block.

[0015] As a further description of the above technical solution:

[0016] A second retraction chamber is provided at the bottom of one side of the lower baffle plate, an inner push block is connected to the second recovery chamber via a fourth spring, an installation box is fixed to the bottom of the inner side of the filter element via an installation groove, an outer push block is fixed to the installation box via a fifth spring, and an entry groove adapted to the outer push block is provided in the middle of one side wall of the second retraction chamber.

[0017] As a further description of the above technical solution:

[0018] A sixth spring is fixed to one end of the upper baffle plate inserted into the upper positioning sleeve, and the bottom end of the sixth spring is connected to the upper positioning sleeve. An upper slide groove is provided on one side of the upper positioning sleeve, and a slide plate adapted to the upper slide groove is fixed to the bottom of one side of the upper baffle plate, so that when the extension plate moves upward, it can push the upper baffle plate upward by resisting the slide plate.

[0019] As a further description of the above technical solution:

[0020] The water inlet pipe comprises a Y-shaped shunt pipe fixed in the outer box, a connecting piece is provided on the Y-shaped shunt pipe, a plurality of water inlet pipes are installed on the connecting piece, both sides of the lower surface of the Y-shaped shunt pipe are provided with an insertion groove adapted to the upper baffle, the top end of the upper baffle is inserted into the insertion groove so that the insertion groove is blocked, and the top end of the upper baffle is adapted to the inner top wall of the Y-shaped shunt pipe so that the top end of the upper baffle can fit with the inner top wall of the Y-shaped shunt pipe;

[0021] A water guide cover is fixed to the lower surface of the filter element located at the top, and the outlet end of the water guide cover corresponds to the upper surface of the filter element located at the bottom.

[0022] As a further description of the above technical solution:

[0023] The water delivery unit comprises a water pump, and both the output end and the input end of the water pump are equipped with connecting pipes.

[0024] As a further description of the above technical solution:

[0025] The water inlet of the anaerobic tank is connected to the water outlet of the outer box, the anaerobic tank is connected to an anaerobic gas storage bag, the anaerobic gas storage bag is connected to the gas inlet of the gas pressure regulating tank through an anaerobic gas outlet pipe, the bottom of the anaerobic tank is connected to a distribution pipe, and the distribution pipe is connected to a stirring distribution;

[0026] The water inlet of the anoxic tank is connected to the water outlet of the anaerobic tank, and the anoxic tank is connected to an anoxic gas storage bag, and the anoxic gas storage bag is connected to the gas inlet of the gas pressure regulating tank through an anoxic gas outlet pipe;

[0027] The water inlet of the aerobic pool is connected to the water outlet of the anoxic pool, the aerobic pool is connected to a mixed liquid return pipe, and the free end of the mixed liquid return pipe is connected to the material distribution pipe;

[0028] The water inlet of the primary sedimentation tank is connected to the water outlet of the aerobic tank, the bottom of the primary sedimentation tank is connected to a sludge return main pipe, the free end of the sludge return main pipe is connected to a three-way valve, the other two ends of the three-way valve are respectively connected to the sludge return branch pipe and the outside, and the free end of the sludge return branch pipe is connected to the anoxic tank;

[0029] The water inlet of the secondary sedimentation tank is connected to the water outlet of the primary sedimentation tank, and the water outlet of the secondary sedimentation tank is connected to the outside world;

[0030] The gas pressure regulating tank is also connected with a gas discharge pipe and a gas return pipe, the free end of the gas discharge pipe is connected with the outside, the free end of the gas return pipe is connected with the mixed liquid return pipe, and the gas return pipe is also connected with the aerobic tank through the aerobic air inlet pipe.

[0031] As a further description of the above technical solution:

[0032] The water inlet of the anaerobic tank and the water outlet of the outer box, the water inlet of the anoxic tank and the water outlet of the anaerobic tank, the water inlet of the aerobic tank and the water outlet of the anoxic tank, the water inlet of the primary sedimentation tank and the water outlet of the aerobic tank, and the water inlet of the secondary sedimentation tank and the water outlet of the primary sedimentation tank are all connected through a connecting pipe. The water inlet of the anoxic tank is connected to a water outlet nozzle through the connecting pipe. The free end of the sludge return branch pipe is at the same horizontal height as the water outlet nozzle, and the pipe diameter of the water outlet nozzle is not less than the pipe diameter of the sludge return branch pipe.

[0033] A method for using a multi-stage AA rural domestic sewage treatment device comprises the following steps:

[0034] S1. Send rural domestic sewage into the outer box through the water inlet pipe, and use the filter element in the outer box to filter impurities and solid waste in the domestic sewage;

[0035] S2, pumping the domestic sewage treated in step S1 into an anaerobic tank, the anaerobic tank digests and decomposes the macromolecular organic matter in the domestic sewage to obtain water-soluble products and gas products that are not completely soluble in water, and the gas products are collected in an anaerobic gas storage bag;

[0036] S3, pumping the domestic sewage treated in step S2 into an anoxic tank, wherein the anoxic tank performs biological denitrification on the domestic sewage inside the anoxic tank, and the obtained nitrogen is collected in an anoxic gas storage bag;

[0037] S4, extracting the domestic sewage treated in step S3 into an aerobic tank, where the activated sludge in the aerobic tank gathers aerobic bacteria, which grow and reproduce in an aerobic environment, and use molecular oxygen as the final electron acceptor in the energy-generating metabolic process of oxidizing organic or inorganic matter, and perform aerobic respiration, converting ammonia nitrogen in the water into nitrate and nitrite through biological nitrification, and the treated mixed solution is returned to the anaerobic tank through a mixed solution reflux pipe for further treatment;

[0038] S5, pumping the domestic sewage treated in step S4 into a primary sedimentation tank for natural sedimentation; the treated sludge is returned to the anoxic tank through the sludge return main pipe and the sludge return branch pipe for further treatment;

[0039] S6, controlling the operation of the gas pressure regulating tank, so that the gas in the anaerobic gas storage bag and the anoxic gas storage bag enters the gas pressure regulating tank, the gas in the anoxic gas storage bag backwashes the gas pressure regulating tank, and controls the discharge and reuse of the gas in the gas pressure regulating tank, wherein the gas in the gas pressure regulating tank is guided to the aerobic tank through the aerobic air inlet pipe, and flows back to the anaerobic tank through the gas reflux pipe and the mixed liquid reflux pipe for further treatment;

[0040] S7. Repeat steps S2 to S6. After reaching the specified water purification standard, the domestic sewage in the primary sedimentation tank is pumped into the secondary sedimentation tank for autochemical phosphorus removal, thereby completing the treatment of the domestic sewage.

[0041] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0042] 1. After domestic sewage enters the device, it is filtered, anaerobic, anoxic, aerobic and precipitated twice in sequence. The anaerobic, anoxic and aerobic processes are operated alternately, which can simultaneously remove organic matter, denitrify and remove phosphorus, etc. It has high treatment efficiency and good effect on domestic sewage. In addition, the device fully and effectively utilizes the resources in the anaerobic, anoxic and aerobic treatment processes, and the energy consumption of the entire device is low;

[0043] 2. Through the compression unit, when the pressure plate is moved downward by the electric hydraulic rod to compress the collected waste, the lower baffle can be driven to move downward together to block the outlet end of the filter element, so that normal filtration can be guaranteed during the compression while the waste will not continue to fall, thereby avoiding the waste from falling on the surface of the pressure plate during compression. At the same time, after the collection box is full, the upper baffle can be moved upward by moving the pressure plate upward to block the Y-shaped diverter pipe, so that during the dumping of waste, even if someone dumps sewage, the sewage will not flow into the box, thereby avoiding the occurrence of sewage splashing. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of a structural plane provided according to an embodiment of the present invention is shown;

[0045] Figure 2 A schematic diagram of a three-dimensional structure in which a lower baffle abuts against an outlet end of a filter element according to an embodiment of the present invention is shown;

[0046] Figure 3 The embodiment of the present invention provides Figure 2 The enlarged view of point A in the middle;

[0047] Figure 4 The embodiment of the present invention provides Figure 2 The enlarged view of point B in the middle;

[0048] Figure 5It shows a schematic diagram of the structure of the interior of the outer box and the guide bucket after being cut open in the initial state according to an embodiment of the present invention;

[0049] Figure 6 A schematic diagram of the planar structure inside the outer box provided according to an embodiment of the present invention is shown;

[0050] Figure 7 It shows a schematic diagram of the overall structure of a filter unit provided according to an embodiment of the present invention;

[0051] Figure 8 The embodiment of the present invention provides Figure 6 Enlarged view of point C in the middle;

[0052] Fig. 9 It shows a schematic diagram of the overall structure after the extension plate provided by an embodiment of the present invention contacts the support bar;

[0053] Fig.10 A schematic diagram of a planar structure in which a lower baffle plate provided in an embodiment of the present invention abuts against an outlet end of a filter element is shown;

[0054] Fig.11 The embodiment of the present invention provides Fig.10 The enlarged view of point D in the middle;

[0055] Fig.12 A schematic diagram of the structure of an upper baffle blocking a Y-shaped shunt pipe according to an embodiment of the present invention is shown;

[0056] Fig.13 A schematic diagram showing the outlet position of a Y-shaped shunt pipe according to an embodiment of the present invention is shown;

[0057] Fig.14 It shows a schematic structural diagram of an upper positioning sleeve provided according to an embodiment of the present invention;

[0058] Fig.15 The embodiment of the present invention provides Fig.14 Enlarged view of point E in the middle;

[0059] Fig.16 The embodiment of the present invention provides Fig.14 The enlarged view of F in the middle;

[0060] Fig.17 A partial structural schematic diagram of the extension plate and the support bar after contacting each other according to an embodiment of the present invention is shown;

[0061] Fig.18 A schematic diagram of the structure of a cutaway pressing plate according to an embodiment of the present invention is shown.

[0062] Legend:

[0063] 10. Filter unit; 11. Outer box; 12. Water inlet pipe; 121. Y-shaped diverter pipe; 122. Water inlet pipe; 13. Filter element; 14. Collection box; 15. Guide bucket; 16. Water guide cover;

[0064] 20. Water delivery unit; 21. Water pump; 22. Connecting pipe;

[0065] 30. Anaerobic tank; 31. Anaerobic gas storage bag; 32. Anaerobic gas outlet pipe; 33. Fabric pipe; 34. Stirring fabric;

[0066] 40. Anoxic pool; 41. Anoxic air storage bag; 42. Anoxic air outlet pipe; 43. Water outlet nozzle;

[0067] 50. Aerobic pool; 51. Mixed liquid return pipe; 52. Aerobic air inlet pipe;

[0068] 60. Primary sedimentation tank; 61. Sludge return main pipe; 62. Three-way valve; 63. Sludge return branch pipe;

[0069] 70. Secondary sedimentation tank;

[0070] 80. Gas pressure regulating tank; 81. Gas discharge pipe; 82. Gas return pipe;

[0071] 90. Compression unit; 91. Electric hydraulic rod; 92. Pressing plate; 93. Upper positioning sleeve; 94. Lower positioning sleeve; 95. Lower baffle; 96. Upper baffle; 97. First spring; 98. Extension plate; 99. Support bar; 910. Torsion spring; 911. Third spring; 912. Block; 913. Slot; 914. Inward push block; 915. Mounting box; 916. Fifth spring; 917. Outward push block. DETAILED DESCRIPTION

[0072] 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.

[0073] like Figure 1 - Fig.18 As shown, the present invention provides:

[0074] A multi-stage AAO rural domestic sewage treatment device comprises a filter unit 10 and a plurality of water supply units 20, wherein the filter unit 10 is connected to an anaerobic tank 30 through one of the water supply units 20, and the anaerobic tank 30 is connected to an anoxic tank 40 through one of the water supply units 20, and a gas pressure regulating tank 80 is installed on the anoxic tank 40;

[0075] The anoxic tank 40 is connected to the aerobic tank 50 via one of the water supply units 20, the aerobic tank 50 is connected to the primary sedimentation tank 60 via one of the water supply units 20, and the primary sedimentation tank 60 is connected to the secondary sedimentation tank 70 via one of the water supply units 20;

[0076] like Figure 1 As shown, the water delivery unit 20 includes a water pump 21, and both the output end and the input end of the water pump 21 are equipped with a connecting pipe 22;

[0077] like Figure 1 As shown, the water inlet of the anaerobic tank 30 is connected to the water outlet of the outer box 11, the anaerobic tank 30 is connected to an anaerobic gas storage bag 31, the anaerobic gas storage bag 31 is connected to the gas inlet of the gas pressure regulating tank 80 through an anaerobic gas outlet pipe 32, the bottom of the anaerobic tank 30 is connected to a distribution pipe 33, and the distribution pipe 33 is connected to a stirring distribution 34;

[0078] The anaerobic gas storage bag 31 collects the gas generated in the tank, and communicates with the distribution pipe 33 provided inside the bag through the gas discharge pipe 81, and the distribution pipe 33 is connected with the stirring cloth 34. The gas reflux drives the stirring cloth 34 to stir the sewage in the anaerobic tank 30, that is, the refluxed gas is used for pneumatic stirring of the anaerobic tank 30, and is guided to the aerobic tank 50 through the gas reflux pipe 82. The gas outlet of the gas reflux pipe 82 is set below the sewage liquid level, and effective stirring can also be performed. The gas outlet is set just above the mixed liquid reflux pipe 51, which can ensure the uniformity of the mixing of the mixed liquid flowing out of the mixed liquid reflux pipe 51.

[0079] The water inlet of the anoxic tank 40 is connected to the water outlet of the anaerobic tank 30, and the anoxic tank 40 is connected to an anoxic gas storage bag 41, and the anoxic gas storage bag 41 is connected to the gas inlet of the gas pressure regulating tank 80 through the anoxic gas outlet pipe 42;

[0080] The anoxic gas storage bag 41 collects the gas generated in the pool, and is connected to the gas pressure regulating tank 80 through the anoxic gas outlet pipe 42, and the gas pressure regulating tank 80 is reversely flushed with gas. The surplus gas is diverted and reused through the gas discharge pipe 81, and a water outlet nozzle 43 is provided on the inner side thereof. The sludge after precipitation and mixing in the primary sedimentation tank 60 is diverted to the anoxic tank 40 for reuse by the sludge return branch pipe 63. The water outlet nozzle 43 is opposite to the outlet of the sludge return branch pipe 63, and the mutual impact of the two can effectively achieve "stirring and mixing" of sewage and sludge.

[0081] The water inlet of the aerobic pool 50 is connected to the water outlet of the anoxic pool 40, and the aerobic pool 50 is connected to a mixed liquid return pipe 51, and the free end of the mixed liquid return pipe 51 is connected to the distribution pipe 33;

[0082] The mixed liquid return pipe 51 guides the mixed liquid inside the aerobic tank 50 to the anaerobic tank 30 for further treatment. In the anaerobic tank 30, the gas and liquid flow back to the inside through the distribution pipe 33. The return gas, return mixed liquid and stirring cloth 34 can stir the sewage inside the anaerobic tank 30 in the three aspects of "gas, liquid and solid", thereby accelerating the reaction efficiency and effect.

[0083] The water inlet of the primary sedimentation tank 60 is connected to the water outlet of the aerobic tank 50, and the bottom of the primary sedimentation tank 60 is connected to a sludge return main pipe 61, and the free end of the sludge return main pipe 61 is connected to a three-way valve 62, and the other two ends of the three-way valve 62 are respectively connected to the sludge return branch pipe 63 and the outside, and the free end of the sludge return branch pipe 63 is connected to the anoxic tank 40;

[0084] The sludge return branch pipe 63 guides the sludge inside the primary sedimentation tank 60 to the anoxic tank for further treatment, so that the domestic sewage is circulated, alternately and repeatedly in the anaerobic, anoxic and aerobic tanks 50, effectively ensuring the treatment effect of the sewage;

[0085] The water inlet of the secondary sedimentation tank 70 is connected to the water outlet of the primary sedimentation tank 60, and the water outlet of the secondary sedimentation tank 70 is connected to the outside;

[0086] The gas pressure regulating tank 80 is also connected to a gas discharge pipe 81 and a gas return pipe 82. The free end of the gas discharge pipe 81 is connected to the outside, and the free end of the gas return pipe 82 is connected to the mixed liquid return pipe 51. The gas return pipe 82 is also connected to the aerobic tank 50 through the aerobic air inlet pipe 52.

[0087] The water inlet of the anaerobic tank 30 and the water outlet of the outer box 11, the water inlet of the anoxic tank 40 and the water outlet of the anaerobic tank 30, the water inlet of the aerobic tank 50 and the water outlet of the anoxic tank 40, the water inlet of the primary sedimentation tank 60 and the water outlet of the aerobic tank 50, and the water inlet of the secondary sedimentation tank 70 and the water outlet of the primary sedimentation tank 60 are all connected through the connecting pipe 22. The water inlet of the anoxic tank 40 is connected to the water outlet nozzle 43 through the connecting pipe 22. The free end of the sludge return branch pipe 63 is at the same horizontal height as the water outlet nozzle 43, and the pipe diameter of the water outlet nozzle 43 is not less than the pipe diameter of the sludge return branch pipe 63.

[0088] like Figure 1 , Figure 2 , Figure 5 and Figure 6As shown, the filter unit 10 includes an outer box 11 and a water inlet pipe 12 mounted on the outer box 11, an inclined filter element 13 is mounted on the inner wall of the outer box 11, a water guide cover 16 is fixed to the lower surface of the filter element 13 located at the top, the outlet end of the water guide cover 16 corresponds to the upper surface of the filter element 13 located at the bottom, a guide bucket 15 is commonly mounted at the bottom ends of the plurality of filter elements 13, a collection box 14 connected to the guide bucket 15 is detachably fixed to the bottom of the inner cavity of the outer box 11, and a compression unit 90 is mounted on the guide bucket 15;

[0089] The Y-shaped shunt pipe 121 guides the domestic sewage to the surfaces of the filter elements 13 on both sides. It is worth noting that only the middle and lower parts of the filter element 13 have a filtering function, and the surface of the part without a filtering function is smooth. After the sewage flows in, it falls on the part without a filtering function, and flows to one side under the left and right of the tilting force, and at the same time, it will flush the filter element 13. The water guide cover 16 guides the sewage filtered by the upper filter element 13 to the part of the lower filter element 13 that does not have a filtering function, and the sewage can also flush the lower filter element 13;

[0090] The compression unit 90 includes an electric hydraulic rod 91 and a pressure plate 92 mounted on the end of the electric hydraulic rod 91. An upper positioning sleeve 93 and a lower positioning sleeve 94 are fixed to the inner wall of the guide bucket 15 and the outer box 11, respectively. A lower baffle 95 for blocking the falling of solid waste is inserted at the bottom of the upper positioning sleeve 93 and the lower positioning sleeve 94, and an upper baffle 96 for blocking the falling of sewage is inserted at the top of the upper positioning sleeve 93.

[0091] The pressing plate 92 moves downward under the drive of the electric hydraulic rod 91, and drives the lower baffle 95 to block the outlet end of the filter element 13, so that when the pressing plate 92 presses down the waste collected in the collecting box 14, the solid waste left after the normal filtration of the sewage can be temporarily blocked.

[0092] like Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, the inside of the pressure plate 92 is connected to an extension plate 98 through a first spring 97, and the bottom of the inner side of the lower baffle plate 95 is rotatably connected to a support bar 99 that matches the end of the extension plate 98 through a U-shaped seat. A torsion spring 910 is sleeved on the rotation connection between the support bar 99 and the U-shaped seat, so that the support bar 99 can only rotate from a horizontal state to a vertical state and can be reset to a horizontal state. Under normal circumstances, under the action of the torsion spring 910, the support bar 99 is in a horizontal state. In the process of the pressure plate 92 moving downward, the end of the extension plate 98 gradually fits with the surface of the support bar 99, and then drives the lower baffle plate 95 to move downward by pushing the support bar 99, gradually blocking the outlet end of the filter element 13.

[0093] like Figure 2 , Figure 3, Fig.14 , Fig.15 and Fig.16 As shown, a second spring is fixed to the top of the lower baffle 95, the lower baffle 95 located at the bottom is installed in the lower positioning sleeve 94 through the second spring, and the lower baffle 95 located at the top is installed in the upper positioning sleeve 93 through the second spring, and a first retraction cavity is opened at the top of one side of the lower baffle 95, and a clamping block 912 is connected to the first retraction cavity through a third spring 911, and a clamping groove 913 adapted to the clamping block 912 is opened at the bottom of the inner side of the upper positioning sleeve 93 and the lower positioning sleeve 94;

[0094] Specifically, under normal conditions, the lower baffle 95 is in a retracted state under the action of the second spring, and the block 912 is also in a retracted state in this state. After the lower baffle 95 moves downward to the bottom end and fits with the outlet end of the filter element 13, the block 912 gradually moves downward during the downward movement and approaches the slot 913. After fitting, the block 912 is inserted into the slot 913 under the drive of the third spring 911, so that the position of the lower baffle 95 is fixed, and the outlet end of the filter element 13 is kept blocked.

[0095] During the upward movement of the extension plate 98, its end contacts the block 912 and gradually pushes against it to move into the first retraction chamber. At this time, under the action of the second spring, the lower baffle plate 95 moves upward again to reset, thereby releasing the blockage on the outlet of the filter element 13. In this way, during the compression of the collected solid waste, the sewage can be filtered normally through the filter element 13, and the retained solid waste will be blocked by the lower baffle plate 95 and will not enter the collection box 14 during the compression process.

[0096] like Figure 8 , Fig.10 , Fig.11 and Fig.16 As shown, a second retraction chamber is provided at the bottom of one side of the lower baffle 95, an inner push block 914 is connected to the second recovery chamber via a fourth spring, a mounting box 915 is fixed to the bottom of the inner side of the filter element 13 via a mounting groove, an outer push block 917 is fixed to the mounting box 915 via a fifth spring 916, and an entry groove adapted to the outer push block 917 is provided in the middle of one side wall of the second retraction chamber;

[0097] Specifically, under normal conditions, the inner push block 914 is in a retracted state, and its end is flush with the surface of the lower baffle plate 95, while the outer push block 917 is in a state of protruding outward, and the elastic force generated by the compression of the fifth spring 916 is greater than the sum of the resistance forces of the fourth spring and the first spring 97 in the uncompressed state, and the restoring force generated by the second spring after the deformation is restored is greater than the resistance force of the fifth spring 916 in the uncompressed state. In the process of the lower baffle plate 95 moving downward, the outer push block 917 is gradually pressed against the outer push block 917 to move into the installation box 915 under the action of the inclined surface at its bottom end, thereby compressing the fifth spring 916, and its end is also pressed against the surface of the lower baffle plate 95 in the process of the lower baffle plate 95 moving downward;

[0098] When the lower baffle 95 moves to the bottom end and contacts the outlet end of the filter element 13, the entry slot also moves downward to correspond to the outward push block 917. At this time, the inner push block 914 is driven to move to one side by the action of the fifth spring 916, thereby pushing the extension plate 98 to move inward, so that the horizontal portion of the end gradually no longer contacts the horizontal portion of the support bar 99. In the process of continuing to move downward, the extension plate 98 is driven to continue to move inward by the action of the inclined surface, and then gradually moves to the bottom of the support bar 99.

[0099] This process is repeated repeatedly. After the above operation is completed on the lower baffle plate 95 located below, the pressing plate 92 and the extending plate 98 enter the collecting box 14, and the waste collected therein is compressed while continuing to move downward. At the same time, the liquid generated during the compression falls into the outer box 11 through the filter plate on the bottom wall of the collecting box 14.

[0100] like Figure 5 , Figure 6 and Fig.12 As shown, one end of the upper baffle plate 96 inserted into the upper positioning sleeve 93 is fixed with a sixth spring, and the bottom end of the sixth spring is connected to the upper positioning sleeve 93. An upper slide groove is provided on one side of the upper positioning sleeve 93, and a slide plate adapted to the upper slide groove is fixed to the bottom of one side of the upper baffle plate 96, so that when the extension plate 98 moves upward, it can push the upper baffle plate 96 to move upward by abutting against the slide plate;

[0101] The water inlet pipe 12 includes a Y-shaped shunt pipe 121 fixed in the outer box 11, a connecting piece is provided on the Y-shaped shunt pipe 121, and a plurality of water inlet pipes 122 are installed on the connecting piece. Both sides of the lower surface of the Y-shaped shunt pipe 121 are provided with insertion grooves adapted to the upper baffle plate 96, and the top end of the upper baffle plate 96 is inserted into the insertion groove so that the insertion groove is blocked, and the top end of the upper baffle plate 96 is adapted to the inner top wall of the Y-shaped shunt pipe 121, so that the top end of the upper baffle plate 96 can fit with the inner top wall of the Y-shaped shunt pipe 121;

[0102] When it is necessary to take out the collection box 14 for dumping the waste, the electric hydraulic rod 91 drives the pressure plate 92 together with the extension plate 98 to move upward. During the process, after the extension plate 98 hits the slide plate, it will push the upper baffle plate 96 to move upward through the slide plate, so that the upper baffle plate 96 hits the inner top wall of the Y-shaped diverter pipe 121, thereby blocking the inner cavity of the Y-shaped diverter pipe 121. When dumping the waste, even if sewage flows into the Y-shaped diverter pipe 121, it will not flow into the outer box 11, thereby avoiding sewage flowing out and splashing onto the staff during the dumping process.

[0103] Specifically, when the filter unit 10 and the compression unit 90 are working:

[0104] 1. Filtration stage:

[0105] Sewage enters: Sewage enters the outer box 11 through the water inlet pipe 12, and the water inlet pipe 12 includes a Y-shaped diverter pipe 121 and a plurality of water inlet pipes 122 to ensure that the sewage can be distributed left and right;

[0106] Filtration process: the sewage flows through the inclined filter element 13, which filters the sewage, allowing the sewage to pass through while intercepting the solid waste;

[0107] Water diversion and collection: The filtered sewage continues to flow, while the solid waste is retained on the filter element 13. After being filtered by the filter element 13 located above, the sewage flows to the filter element 13 below through the water diversion cover 16. After being filtered again, the solid waste remaining after being filtered by the filter elements 13 above and below finally falls into the guide bucket 15 and enters the collection box 14 through the guide bucket 15.

[0108] 2. Compression stage:

[0109] Prepare for compression: When the solid waste in the collection box 14 accumulates to a certain amount, the compression unit 90 is started, and the electric hydraulic rod 91 drives the pressing plate 92 to move downward;

[0110] Blocking solid waste: When the pressing plate 92 moves downward, the interaction between the extension plate 98 and the support bar 99 pushes the lower baffle plate 95 to move downward and fit the outlet end of the filter element 13, thereby temporarily blocking the solid waste from falling. At this time, the sewage can still be filtered normally through the filter element 13;

[0111] Compression of solid waste: The pressing plate 92 continues to move downward and enters the collecting box 14 to compress the solid waste collected therein. The liquid generated during the compression process flows back into the outer box 11 through the filter plate at the bottom of the collecting box 14;

[0112] Unblocking: After the compression is completed, the electric hydraulic rod 91 drives the pressure plate 92 and the extension plate 98 to move upward; after the end of the extension plate 98 contacts the block 912, it gradually pushes it back into the first retraction chamber. At the same time, the second spring causes the lower baffle 95 to move upward again, unblocking the outlet of the filter element 13. At this time, the solid waste has been compressed.

[0113] 3. Waste dumping stage:

[0114] Prepare to dump: When it is necessary to dump the waste in the collection box 14, the electric hydraulic rod 91 is started again to drive the pressing plate 92 and the extension plate 98 to move upward;

[0115] Blocking water inflow: When the extension plate 98 moves upward, the upper baffle plate 96 is pushed upward by the abutting slide plate until the top of the upper baffle plate 96 fits against the inner top wall of the Y-shaped shunt pipe 121, thereby blocking the inner cavity of the Y-shaped shunt pipe 121;

[0116] Removal and dumping: After ensuring that the Y-shaped diverter pipe 121 is blocked, the collection box 14 can be safely removed for waste dumping. During the dumping process, even if sewage flows into the Y-shaped diverter pipe 121, it will not flow into the outer box 11, avoiding sewage splashing onto the staff.

[0117] A method for using a multi-stage AAO rural domestic sewage treatment device comprises the following steps:

[0118] S1. Send rural domestic sewage into the outer box 11 through the water inlet pipe 12, and use the filter element 13 in the outer box 11 to filter impurities and solid waste in the domestic sewage;

[0119] S2, pumping the domestic sewage treated in step S1 into the anaerobic tank 30, the anaerobic tank 30 digests and decomposes the macromolecular organic matter in the domestic sewage to obtain water-soluble products and gas products that are not completely soluble in water, and the gas products are collected in the anaerobic gas storage bag 31;

[0120] S3, pumping the domestic sewage treated in step S2 into the anoxic tank 40, the anoxic tank 40 performs biological denitrification on the domestic sewage inside the anoxic tank 40, and the obtained nitrogen is collected in the anoxic gas storage bag 41;

[0121] S4, pumping the domestic sewage treated in step S3 into the aerobic tank 50, the activated sludge in the aerobic tank 50 gathers aerobic bacteria, the aerobic bacteria grow and reproduce in an aerobic environment, and the energy-producing metabolic process of oxidizing organic or inorganic substances uses molecular oxygen as the final electron acceptor to perform aerobic respiration, and converts ammonia nitrogen in the water into nitrate and nitrite through biological nitrification, and the treated mixed solution is returned to the anaerobic tank 30 through the mixed solution reflux pipe 51 for further treatment;

[0122] S5, pumping the domestic sewage treated in step S4 into the primary sedimentation tank 60 for natural sedimentation; the treated sludge is returned to the anoxic tank 40 through the sludge return main pipe 61 and the sludge return branch pipe 63 for further treatment;

[0123] S6, controlling the operation of the gas pressure regulating tank 80, so that the gas in the anaerobic gas storage bag 31 and the anoxic gas storage bag 41 enters the gas pressure regulating tank 80, and the gas in the anoxic gas storage bag 41 backwashes the gas pressure regulating tank 80, and controls the discharge and reuse of the gas in the gas pressure regulating tank 80, wherein the gas in the gas pressure regulating tank 80 is directed to the aerobic tank 50 through the aerobic air inlet pipe 52, and flows back to the anaerobic tank 30 through the gas reflux pipe 82 and the mixed liquid reflux pipe 51, and is treated again;

[0124] S7. Repeat steps S2 to S6. After reaching the specified water purification standard, the domestic sewage in the primary sedimentation tank 60 is pumped into the secondary sedimentation tank 70 for autochemical phosphorus removal, thereby completing the treatment of the domestic sewage.

[0125] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-stage AAO rural domestic sewage treatment device, comprising a filtering unit (10) and a plurality of water delivery units (20), characterized in that: The filtering unit (10) is connected to an anaerobic tank (30) via one of the water supply units (20), the anaerobic tank (30) is connected to an anoxic tank (40) via one of the water supply units (20), and the anoxic tank (40) is equipped with a gas pressure regulating tank (80); The anoxic tank (40) is connected to the aerobic tank (50) via one of the water supply units (20), the aerobic tank (50) is connected to the primary sedimentation tank (60) via one of the water supply units (20), and the primary sedimentation tank (60) is connected to the secondary sedimentation tank (70) via one of the water supply units (20); The filter unit (10) comprises an outer box (11) and a water inlet pipe (12) mounted on the outer box (11); an inclined filter element (13) is mounted on the inner wall of the outer box (11); a guide bucket (15) is mounted on the bottom ends of a plurality of the filter elements (13); a collection box (14) connected to the guide bucket (15) is detachably fixed at the bottom of the inner cavity of the outer box (11); and a compression unit (90) is mounted on the guide bucket (15); The compression unit (90) comprises an electric hydraulic rod (91) and a pressure plate (92) mounted on the end of the electric hydraulic rod (91); an upper positioning sleeve (93) and a lower positioning sleeve (94) are respectively fixed on the inner wall of the guide bucket (15) and the outer box (11); a lower baffle (95) for blocking the falling of solid waste is inserted at the bottom ends of the upper positioning sleeve (93) and the lower positioning sleeve (94); and an upper baffle (96) for blocking the falling of sewage is inserted at the top end of the upper positioning sleeve (93); The pressing plate (92) moves downward under the drive of the electric hydraulic rod (61) and drives the lower baffle plate (95) to block the outlet end of the filter element (13), so that when the pressing plate (92) presses down the waste collected in the collection box (14), the solid waste remaining after the sewage is normally filtered can be temporarily blocked.

2. A multi-stage AAO rural domestic sewage treatment device according to claim 1, characterized in that: The interior of the pressure plate (92) is connected to an extension plate (98) via a first spring (97); the bottom of the inner side of the lower baffle plate (95) is rotatably connected to a support bar (99) adapted to the end of the extension plate (98) via a U-shaped seat; a torsion spring (910) is sleeved at the rotatable connection between the support bar (99) and the U-shaped seat, so that the support bar (99) can only rotate from a horizontal state to a vertical state and can be reset to a horizontal state.

3. A multi-stage AAO rural domestic sewage treatment device according to claim 2, characterized in that: A second spring is fixed to the top of the lower baffle (95); the lower baffle (95) located at the bottom is installed in the lower positioning sleeve (94) through the second spring; the lower baffle (95) located at the top is installed in the upper positioning sleeve (93) through the second spring; a first retraction cavity is provided at the top of one side of the lower baffle (95); a clamping block (912) is connected to the first retraction cavity through a third spring (911); and a clamping groove (913) adapted to the clamping block (912) is provided at the bottom of the inner side of each of the upper positioning sleeve (93) and the lower positioning sleeve (94).

4. A multi-stage AAO rural domestic sewage treatment device according to claim 3, characterized in that: A second retraction chamber is provided at the bottom of one side of the lower baffle plate (95), and an inner push block (914) is connected to the second recovery chamber via a fourth spring. A mounting box (915) is fixed to the bottom of the inner side of the filter element (13) via a mounting groove, and an outer push block (917) is fixed to the mounting box (915) via a fifth spring (916). An entry groove matching the outer push block (917) is provided in the middle of one side wall of the second retraction chamber.

5. A multi-stage AAO rural domestic sewage treatment device according to claim 1, characterized in that: A sixth spring is fixed to one end of the upper baffle plate (96) inserted into the upper positioning sleeve (93), and the bottom end of the sixth spring is connected to the upper positioning sleeve (93). An upper slide groove is provided on one side of the upper positioning sleeve (93), and a slide plate adapted to the upper slide groove is fixed to the bottom of one side of the upper baffle plate (96), so that when the extension plate (98) moves upward, it can push the upper baffle plate (96) upward by abutting against the slide plate.

6. A multi-stage AAO rural domestic sewage treatment device according to claim 5, characterized in that: The water inlet pipe member (12) comprises a Y-shaped flow diversion pipe (121) fixed in the outer box (11); a connecting piece is provided on the Y-shaped flow diversion pipe (121); a plurality of water inlet pipes (122) are installed on the connecting piece; both sides of the lower surface of the Y-shaped flow diversion pipe (121) are provided with insertion grooves adapted to the upper baffle plate (96); the top end of the upper baffle plate (96) is inserted into the insertion groove so that the insertion groove is blocked; and the top end of the upper baffle plate (96) is adapted to the inner top wall of the Y-shaped flow diversion pipe (121) so that the top end of the upper baffle plate (96) can fit with the inner top wall of the Y-shaped flow diversion pipe (121); A water guide cover (16) is fixed to the lower surface of the filter element (13) located at the top, and the outlet end of the water guide cover (16) corresponds to the upper surface of the filter element (13) located at the bottom.

7. A multi-stage AAO rural domestic sewage treatment device according to claim 1, characterized in that: The water delivery unit (20) comprises a water pump (21), and both the output end and the input end of the water pump (21) are equipped with connecting pipes (22).

8. A multi-stage AAO rural domestic sewage treatment device according to claim 7, characterized in that: The water inlet of the anaerobic tank (30) is connected to the water outlet of the outer box (11); the anaerobic tank (30) is connected to an anaerobic gas storage bag (31); the anaerobic gas storage bag (31) is connected to the gas inlet of the gas pressure regulating tank (80) through an anaerobic gas outlet pipe (32); the bottom of the anaerobic tank (30) is connected to a distribution pipe (33); the distribution pipe (33) is connected to a stirring distribution device (34); The water inlet of the anoxic tank (40) is connected to the water outlet of the anaerobic tank (30), the anoxic tank (40) is connected to an anoxic gas storage bag (41), and the anoxic gas storage bag (41) is connected to the gas inlet of the gas pressure regulating tank (80) through an anoxic gas outlet pipe (42); The water inlet of the aerobic pool (50) is connected to the water outlet of the anoxic pool (40), the aerobic pool (50) is connected to a mixed liquid return pipe (51), and the free end of the mixed liquid return pipe (51) is connected to the material distribution pipe (33); The water inlet of the primary sedimentation tank (60) is connected to the water outlet of the aerobic tank (50), the bottom of the primary sedimentation tank (60) is connected to a sludge return main pipe (61), the free end of the sludge return main pipe (61) is connected to a three-way valve (62), the other two ends of the three-way valve (62) are respectively connected to the sludge return branch pipe (63) and the outside, and the free end of the sludge return branch pipe (63) is connected to the anoxic tank (40); The water inlet of the secondary sedimentation tank (70) is connected to the water outlet of the primary sedimentation tank (60), and the water outlet of the secondary sedimentation tank (70) is connected to the outside; The gas pressure regulating tank (80) is also connected to a gas discharge pipe (81) and a gas return pipe (82); the free end of the gas discharge pipe (81) is connected to the outside, the free end of the gas return pipe (82) is connected to the mixed liquid return pipe (51), and the gas return pipe (82) is also connected to the aerobic tank (50) through the aerobic air inlet pipe (52).

9. A multi-stage AAO rural domestic sewage treatment device according to claim 8, characterized in that: The water inlet of the anaerobic tank (30) and the water outlet of the outer box (11), the water inlet of the anoxic tank (40) and the water outlet of the anaerobic tank (30), the water inlet of the aerobic tank (50) and the water outlet of the anoxic tank (40), the water inlet of the primary sedimentation tank (60) and the water outlet of the aerobic tank (50), and the water inlet of the secondary sedimentation tank (70) and the water outlet of the primary sedimentation tank (60) are all connected via a connecting pipe (22). The water inlet of the anoxic tank (40) is connected to a water outlet nozzle (43) via the connecting pipe (22). The free end of the sludge return branch pipe (63) and the water outlet nozzle (43) are at the same horizontal height, and the pipe diameter of the water outlet nozzle (43) is not less than the pipe diameter of the sludge return branch pipe (63).

10. A method for using a multi-stage AAO rural domestic sewage treatment device according to any one of claims 1 to 9, characterized in that: The steps include: S1. Send rural domestic sewage into the outer box (11) through the water inlet pipe (12), and use the filter element (13) in the outer box (11) to filter impurities and solid waste in the domestic sewage; S2, pumping the domestic sewage treated in step S1 into an anaerobic tank (30), wherein the anaerobic tank (30) digests and decomposes the macromolecular organic matter in the domestic sewage to obtain water-soluble products and gaseous products that are not completely soluble in water, and the gaseous products are collected in an anaerobic gas storage bag (31); S3, pumping the domestic sewage treated in step S2 into an anoxic tank (40), wherein the anoxic tank (40) performs biological denitrification on the domestic sewage inside the anoxic tank (40), and the obtained nitrogen is collected in an anoxic gas storage bag (41); S4, pumping the domestic sewage treated in step S3 into an aerobic tank (50), wherein the activated sludge in the aerobic tank (50) gathers aerobic bacteria, and the aerobic bacteria grow and reproduce in an aerobic environment, and the energy-producing metabolic process of oxidizing organic or inorganic substances uses molecular oxygen as the final electron acceptor, and performs aerobic respiration, converting ammonia nitrogen in the water into nitrate and nitrite through biological nitrification, and the treated mixed liquid is returned to the anaerobic tank (30) through the mixed liquid return pipe (51) for further treatment; S5, pumping the domestic sewage treated in step S4 into a primary sedimentation tank (60) for natural sedimentation; The treated sludge is returned to the anoxic tank (40) through the sludge return main pipe (61) and the sludge return branch pipe (63) for further treatment; S6, controlling the operation of the gas pressure regulating tank (80) so that the gas in the anaerobic gas storage bag (31) and the anoxic gas storage bag (41) enters the gas pressure regulating tank (80), and the gas in the anoxic gas storage bag (41) backwashes the gas pressure regulating tank (80), and controls the discharge and reuse of the gas in the gas pressure regulating tank (80), wherein the gas in the gas pressure regulating tank (80) is guided to the aerobic tank (50) through the aerobic gas inlet pipe (52), and flows back to the anaerobic tank (30) through the gas return pipe (82) and the mixed liquid return pipe (51), and is treated again; S7. Repeat steps S2 to S6. After reaching the specified water purification standard, the domestic sewage in the primary sedimentation tank (60) is pumped into the secondary sedimentation tank (70) for autochemical phosphorus removal, thereby completing the treatment of the domestic sewage.

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