A multi-stage AAO rural domestic sewage treatment device and method

Abstract

The present invention discloses a multi-stage AAO rural domestic sewage treatment device and method, belonging to the technical field of domestic sewage treatment, including a filtering unit and multiple water delivery units. The filtering unit is connected to an anaerobic tank through one of the water delivery units, the anaerobic tank is connected to an anoxic tank through one of the water delivery units, and a gas pressure regulating tank is assembled on the anoxic tank; through the arranged compression unit, when the waste collected is compressed by moving the pressing plate downward through the electro-hydraulic rod, the lower baffle can be driven to move downward together to block the outlet end of the filtering element, so that during compression, normal filtration can be ensured while the waste will not continue to fall, thereby avoiding the waste from falling on the surface of the pressing plate. At the same time, after the collection box is full, by moving the pressing plate upward, the upper baffle can be moved upward to block the Y-shaped shunt pipe, so that during the period of dumping waste, even if someone dumps sewage, the sewage will not flow into the box, thereby avoiding the situation of sewage splashing everywhere.

Description

Technical Field

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

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

[0003] In the existing sewage treatment device / process based on multi-stage AAO (anaerobic + anoxic + aerobic), the resource utilization rate is low, resulting in high energy consumption and poor treatment effect. At the same time, during the treatment, the waste intercepted by the filter element is collected through a collection box. In order to increase the collection volume, the waste in the box is compressed to reduce the occupied space. However, during the compression process, there is often still sewage flowing, which causes the waste to continuously flow into the box, bringing difficulties to the compression work. At the same time, when dumping the waste, since it is impossible to control people from not dumping sewage, it is easy for sewage to flow in during the waste dumping process, resulting in splashing and causing pollution. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems that during the compression process, there is often still sewage flowing, which causes the waste to continuously flow into the box, bringing difficulties to the compression work. At the same time, when dumping the waste, since it is impossible to control people from not dumping sewage, it is easy for sewage to flow in during the waste dumping process, resulting in splashing and causing pollution, and to propose a multi-stage AAO rural domestic sewage treatment device and method.

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

[0006] A multi-stage AA rural domestic sewage treatment device includes a filtering unit and a plurality of water delivery units. The filtering unit is connected to an anaerobic tank through one of the water delivery units. The anaerobic tank is connected to an anoxic tank through one of the water delivery units. A gas pressure regulating tank is assembled on the anoxic tank;

[0007] The anoxic tank is connected to an aerobic tank through one of the water delivery units. The aerobic tank is connected to a primary sedimentation tank through one of the water delivery units. The primary sedimentation tank is connected to a secondary sedimentation tank through one of the water delivery units;

[0008] The filtering unit includes an outer box and a water inlet pipe assembly mounted on the outer box. An inclined filtering member is mounted on the inner wall of the outer box. A guiding hopper is jointly mounted at the bottom ends of a plurality of the filtering members. A collecting box communicating with the guiding hopper is detachably fixed at the bottom of the inner cavity of the outer box. A compressing unit is mounted on the guiding hopper;

[0009] The compressing unit includes an electro-hydraulic rod and a pressing plate mounted at the end of the electro-hydraulic rod. An upper positioning sleeve and a lower positioning sleeve are respectively fixed on the guiding hopper and the inner wall of the outer box. A lower baffle for blocking the falling of solid waste is inserted at the bottom ends of the upper positioning sleeve and the lower positioning sleeve. An upper baffle for blocking the falling of sewage is inserted at the top end of the upper positioning sleeve;

[0010] The pressing plate moves downward under the drive of the electro-hydraulic rod and drives the lower baffle to block the outlet end of the filtering member, so that during the process of pressing the waste collected in the collecting box by the pressing plate, the solid waste left after normal filtration of the sewage can be temporarily blocked.

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

[0012] An extension plate is connected to the inside of the pressing plate through a first spring. A support bar adapted to the end of the extension plate is rotatably connected to the bottom of the inner side of the lower baffle through a U-shaped seat. A torsion spring is sleeved at the rotational connection of the support bar and the U-shaped seat, so that the support bar can only rotate from the horizontal state to the vertical state and can reset to the horizontal state.

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

[0014] A second spring is fixed to the top end of the lower baffle. The lower baffle located below is installed in the lower positioning sleeve through the second spring. The lower baffle located above is installed in the upper positioning sleeve through the second spring. A first retraction cavity is formed at the top of one side of the lower baffle. A clamping block is connected to the first retraction cavity through a third spring. Claw slots adapted to the clamping block are formed at the bottoms of the inner sides of the upper positioning sleeve and the lower positioning sleeve.

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

[0016] A second retraction cavity is formed at the bottom of one side of the lower baffle. An inner pushing block is connected to the second retraction cavity through a fourth spring. An installation box is fixed to the bottom of the inner side of the filtering member by opening an installation groove. An outer pushing block is fixed in the installation box through a fifth spring. An entry groove adapted to the outer pushing block is formed at the middle of one side wall of the second retraction cavity.

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

[0018] One end of the upper baffle plate inserted into the upper positioning sleeve is fixed with a sixth spring, the bottom end of the sixth spring is connected to the upper positioning sleeve, a upper sliding groove is formed on one side of the upper positioning sleeve, and a sliding plate adapted to the upper sliding groove is fixed at the bottom of one side of the upper baffle plate, so that when the extension plate moves upward, the upper baffle plate can be pushed to move upward by abutting against the sliding plate.

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

[0020] The water inlet pipe fitting includes a Y-shaped shunt pipe fixed in the outer box, a connecting member is provided on the Y-shaped shunt pipe, a plurality of water inlet pipes are installed on the connecting member, insertion grooves adapted to the upper baffle plate are formed on both sides of the lower surface of the Y-shaped shunt pipe, the top end of the upper baffle plate is inserted into the insertion grooves, so that the insertion grooves are blocked, and the top end of the upper baffle plate is adapted to the inner top wall of the Y-shaped shunt pipe, so that the top end of the upper baffle plate can be attached to the inner top wall of the Y-shaped shunt pipe;

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

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

[0023] The water delivery unit includes a water pump, and communicating pipes are assembled at both the output end and the input end of the water pump.

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

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

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

[0027] The water inlet of the aerobic pond is communicated with the water outlet of the anoxic pond, the aerobic pond is communicated with a mixed liquid return pipe, and the free end of the mixed liquid return pipe is communicated with the cloth pipe;

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

[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;

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

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

[0032] Between the water inlet of the anaerobic tank and the water outlet of the outer tank, between the water inlet of the anoxic tank and the water outlet of the anaerobic tank, between the water inlet of the aerobic tank and the water outlet of the anoxic tank, between the water inlet of the primary sedimentation tank and the water outlet of the aerobic tank, and between the water inlet of the secondary sedimentation tank and the water outlet of the primary sedimentation tank are all connected through connecting pipes. The water inlet of the anoxic tank is connected with a water outlet spray head through a connecting pipe. The free end of the sludge reflux branch pipe is at the same horizontal height as the water outlet spray head, and the pipe diameter of the water outlet spray head is not less than that of the sludge reflux branch pipe.

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

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

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

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

[0037] S4. Pump the domestic sewage treated in step S3 into the aerobic tank. The activated sludge in the aerobic tank aggregates aerobic bacteria. The aerobic bacteria grow and reproduce in an aerobic environment. The energy metabolism process of oxidizing organic or inorganic substances uses molecular oxygen as the final electron acceptor to perform aerobic respiration, converting ammonia nitrogen in the water into nitrates and nitrites through biological nitrification. The treated mixed liquid is refluxed to the anaerobic tank through the mixed liquid reflux pipe for further treatment;

[0038] S5. Pump the domestic sewage treated in step S4 into the primary sedimentation tank for natural sedimentation; the treated sludge is refluxed to the anoxic tank through the sludge reflux main pipe and the sludge reflux branch pipe for further treatment;

[0039] S6. Control 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 is used to backwash the gas pressure regulating tank, and control the discharge and reuse of the gas in the gas pressure regulating tank. Among them, the gas in the gas pressure regulating tank is guided to the aerobic tank through the aerobic inlet pipe, and then 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 purified water standard, pump the domestic sewage in the primary sedimentation tank to the secondary sedimentation tank for self-chemical phosphorus removal, that is, the treatment of domestic sewage is completed.

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

[0042] 1. After domestic sewage enters the device, it is filtered, anaerobically treated, anoxically treated, aerobically treated, and precipitated twice in sequence. Among them, anaerobic, anoxic, and aerobic treatments alternate, which can simultaneously achieve multiple purposes such as removing organic matter, denitrification, and phosphorus removal. The treatment efficiency and effect of domestic sewage are high, and the device makes full and effective use of resources in the anaerobic, anoxic, and aerobic treatment processes, and the energy consumption of the entire device is low.

[0043] 2. Through the set compression unit, when the waste collected is compressed by moving the pressing plate downward through the electro-hydraulic rod, the lower baffle can be driven to move downward together to block the outlet end of the filter element, so that during compression, normal filtration can be ensured while the waste will not continue to fall, thereby avoiding the waste from falling on the surface of the pressing plate. At the same time, after the collection box is full, by moving the pressing plate upward, the upper baffle can be moved upward to block the Y-shaped diversion pipe, so that during the dumping of waste, even if someone dumps sewage, the sewage will not flow into the box, thereby avoiding the situation of sewage splashing. Brief Description of the Drawings

[0044] Figure 1 Shows a schematic plan view of the structure provided according to an embodiment of the present invention;

[0045] Figure 2 Shows a three-dimensional structure diagram of the lower baffle abutted against the outlet end of the filter element provided according to an embodiment of the present invention;

[0046] Figure 3 Shows the one provided according to an embodiment of the present invention Figure 2 Enlarged view of part A;

[0047] Figure 4 Shows the one provided according to an embodiment of the present invention Figure 2 Enlarged view of part B;

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

[0055] Figure 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] Figure 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] Figure 14 It shows a schematic structural diagram of an upper positioning sleeve provided according to an embodiment of the present invention;

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

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

[0060] Figure 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] Figure 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 fitting; 121. Y-shaped shunt pipe; 122. Water inlet pipe; 13. Filter element; 14. Collection box; 15. Guide hopper; 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. Cloth pipe; 34. Stirring and cloth spreading;

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

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

[0068] 60. Primary sedimentation tank; 61. Total sludge return 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. Inner pushing block; 915. Installation box; 916. Fifth spring; 917. Outer pushing block. Specific embodiments

[0072] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

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

[0074] A multi-stage AAO rural domestic sewage treatment device, including a filtering unit 10 and a plurality of water delivery units 20. The filtering unit 10 is connected to an anaerobic tank 30 through one of the water delivery units 20. The anaerobic tank 30 is connected to an anoxic tank 40 through one of the water delivery units 20. A gas pressure regulating tank 80 is assembled on the anoxic tank 40;

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

[0076] As Figure 1 shown, the water supply unit 20 includes a water pump 21, and connecting pipes 22 are assembled at both the output end and the input end of the water pump 21.

[0077] As Figure 1 shown, the water inlet of the anaerobic tank 30 is connected to the water outlet of the outer tank 11. An anaerobic gas storage bag 31 is connected to the anaerobic tank 30. 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. A cloth pipe 33 is connected to the bottom of the anaerobic tank 30, and a stirring cloth 34 is connected to the cloth pipe 33.

[0078] The anaerobic gas storage bag 31 collects the gas generated in the tank and is connected to the cloth pipe 33 provided inside it through a gas discharge pipe 81. And a stirring cloth 34 is connected to the cloth pipe 33. 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 into the aerobic tank 50 through a gas reflux pipe 82. The gas outlet of the gas reflux pipe 82 is arranged below the sewage liquid level and can also carry out effective stirring. Setting its gas outlet directly above the mixed liquid reflux pipe 51 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. An anoxic gas storage bag 41 is connected to the anoxic tank 40. 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.

[0080] The anoxic gas storage bag 41 collects the gas generated in the tank and is connected to the gas pressure regulating tank 80 through the anoxic gas outlet pipe 42 to conduct a reverse air pressure flushing on the gas pressure regulating tank 80. The surplus gas is guided through the gas discharge pipe 81 for reuse. A water outlet nozzle 43 is provided inside it. The sludge after sedimentation and mixing in the primary sedimentation tank 60 is guided to the anoxic tank 40 for reuse through a sludge reflux branch pipe 63. The water outlet nozzle 43 is opposite to the outlet of the sludge reflux branch pipe 63, and the mutual impact of the two can effectively achieve the "stirring and mixing" of sewage and sludge.

[0081] The water inlet of the aerobic tank 50 is connected to the water outlet of the anoxic tank 40. The aerobic tank 50 is connected to a mixed liquid reflux pipe 51, and the free end of the mixed liquid reflux pipe 51 is connected to the cloth pipe 33.

[0082] The mixed liquid reflux pipe 51 diverts the mixed liquid inside the aerobic tank 50 into the anaerobic tank 30 for further treatment. In the anaerobic tank 30, gas and liquid flow back to its inside through the cloth pipe 33. The reflux gas, reflux mixed liquid, and stirring and cloth distribution 34 can perform "gas, liquid, solid" three-phase stirring on the sewage inside it, 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. A sludge reflux main pipe 61 is connected to the bottom of the primary sedimentation tank 60. The free end of the sludge reflux 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 reflux branch pipe 63 and the outside. The free end of the sludge reflux branch pipe 63 is connected to the anoxic tank 40;

[0084] The sludge reflux branch pipe 63 diverts the sludge inside the primary sedimentation tank 60 into the anoxic tank for further treatment, enabling domestic sewage to circulate, alternate, and repeat in the anaerobic, anoxic, and aerobic tanks 50, effectively ensuring the sewage treatment effect;

[0085] The water inlet of the secondary sedimentation tank 70 is connected to the water outlet of the primary sedimentation tank 60. 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 reflux pipe 82. The free end of the gas discharge pipe 81 is connected to the outside. The free end of the gas reflux pipe 82 is connected to the mixed liquid reflux pipe 51. The gas reflux pipe 82 is also connected to the aerobic tank 50 through an aerobic inlet pipe 52.

[0087] Between the water inlet of the anaerobic tank 30 and the water outlet of the outer box 11, between the water inlet of the anoxic tank 40 and the water outlet of the anaerobic tank 30, between the water inlet of the aerobic tank 50 and the water outlet of the anoxic tank 40, between the water inlet of the primary sedimentation tank 60 and the water outlet of the aerobic tank 50, and between the water inlet of the secondary sedimentation tank 70 and the water outlet of the primary sedimentation tank 60 are all connected through a connecting pipe 22. The water inlet of the anoxic tank 40 is connected to a water outlet nozzle 43 through the connecting pipe 22. The free end of the sludge reflux 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 that of the sludge reflux branch pipe 63.

[0088] Such as Figure 1 、 Figure 2 、 Figure 5 And Figure 6As shown, the filtering unit 10 includes an outer box 11 and a water inlet pipe fitting 12 assembled on the outer box 11. A filtering member 13 is inclinedly assembled on the inner wall of the outer box 11. A water guide cover 16 is fixed to the lower surface of the upper filtering member 13. The outlet end of the water guide cover 16 corresponds to the upper surface of the lower filtering member 13. A guide hopper 15 is assembled at the bottom ends of the plurality of filtering members 13. A collection box 14 communicating with the guide hopper 15 is detachably fixed to the bottom of the inner cavity of the outer box 11. A compression unit 90 is assembled on the guide hopper 15;

[0089] The Y-shaped shunt pipe 121 guides domestic sewage to the surfaces of the two-side filtering members 13. It should be noted that only the middle and lower parts of the filtering member 13 have the filtering function, and the surfaces of the parts without the filtering function are smooth. After the sewage flows in, it falls on the parts without the filtering function and flows to one side under the influence of the inclination force, and at the same time, it will scour the filtering member 13. The water guide cover 16 concentrates the sewage filtered by the upper filtering member 13 and guides it to the part without the filtering function on the upper surface of the lower filtering member 13, and the sewage can also scour the lower filtering member 13;

[0090] The compression unit 90 includes an electric hydraulic rod 91 and a pressing plate 92 assembled at the end of the electric hydraulic rod 91. An upper positioning sleeve 93 and a lower positioning sleeve 94 are respectively fixed on the guide hopper 15 and the inner wall of 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. An upper baffle 96 for blocking the falling of sewage is inserted at the top end 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 filtering member 13, so that during the process of pressing the waste collected in the collection box 14 by the pressing plate 92, the solid waste left after the normal filtration of the sewage can be temporarily blocked.

[0092] As Figure 2 、 Figure 3 、 Figure 4 and Figure 6 shown, an extension plate 98 is connected to the inside of the pressing plate 92 through a first spring 97. A support bar 99 adapted to the end of the extension plate 98 is rotatably connected to the bottom inside the lower baffle 95 through a U-shaped seat. A torsion spring 910 is sleeved at the rotational connection of the support bar 99 and the U-shaped seat, so that the support bar 99 can only rotate from the horizontal state to the vertical state and can be reset to the horizontal state. Under normal conditions, under the action of the torsion spring 910, the support bar 99 is in the horizontal state. During the downward movement of the pressing plate 92, the end of the extension plate 98 gradually fits with the surface of the support bar 99, and then drives the lower baffle 95 to move downward by pushing the support bar 99, gradually blocking the outlet end of the filtering member 13.

[0093] As Figure 2 、 Figure 3, Figure 14 , Figure 15 and Figure 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 , Figure 10 , Figure 11 and Figure 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 retraction 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 pushing block 914 is in a retracted state, and its end is flush with the surface of the lower baffle 95. At the same time, the outer pushing block 917 is in a state of protruding outward, and the elastic force generated after the fifth spring 916 is compressed is greater than the sum of the resistance forces of the fourth spring and the first spring 97 in the uncompressed state. At the same time, the restoring force generated after the deformation and restoration of the second spring is greater than the resistance force of the fifth spring 916 in the uncompressed state. During the downward movement of the lower baffle 95, under the action of the inclined surface at its bottom end, it gradually abuts against the outer pushing block 917 and moves it inward into the installation box 915, thereby compressing the fifth spring 916, and its end also abuts against the surface of the lower baffle 95 during the downward movement of the lower baffle 95;

[0098] When the lower baffle 95 moves to the bottom and abuts against the outlet end of the filter element 13, at this time, the inlet groove also moves downward to correspond to the outer pushing block 917. At this time, under the action of the fifth spring 916, the inner pushing block 914 is driven to move to one side, and then the extension plate 98 is pushed to move inward, so that the horizontal part of its end gradually no longer contacts the horizontal part of the support bar 99. Then, during the continued downward movement, under the action of the inclined surface, the extension plate 98 is driven to continue to move inward, and then gradually moves below the support bar 99;

[0099] So on and so forth. After the above operations are completed on the lower baffle 95 located below, the pressing plate 92 and the extension plate 98 enter the collection box 14, and during the continued downward movement, the waste collected inside is compressed, and at the same time, the liquid generated during compression falls through the filter plate on the inner bottom wall of the collection box 14 into the outer box 11.

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

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

[0102] When the collection box 14 needs to be taken out for waste dumping, the electric hydraulic rod 91 drives the pressing plate 92 and the extension plate 98 to move upward. During this process, after the extension plate 98 abuts against the sliding plate, when it continues to move, it will push the upper baffle 96 upward through the sliding plate, and then the upper baffle 96 abuts against the inner top wall of the Y-shaped diversion pipe 121, thereby blocking the inner cavity of the Y-shaped diversion pipe 121. Thus, when dumping waste, even if sewage flows into the Y-shaped diversion pipe 121, it will not flow into the outer box 11, avoiding sewage splashing onto the staff during the dumping process.

[0103] Specifically, when the filtering unit 10 and the compressing unit 90 are working:

[0104] 1. Filtration stage:

[0105] Sewage inlet: Sewage enters the outer box 11 through the water inlet pipe fitting 12. The water inlet pipe fitting 12 includes a Y-shaped diversion 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. The filter element 13 filters the sewage, allowing the sewage to pass through while intercepting solid waste;

[0107] Water conduction and collection: The filtered sewage continues to flow, while the solid waste is intercepted on the filter element 13. The sewage passes through the water guide cover 16 and flows to the lower filter element 13 after being filtered by the upper filter element 13. After being filtered again, the solid waste left after being filtered by the upper and lower filter elements 13 finally falls into the guiding hopper 15 and enters the collection box 14 through the guiding hopper 15.

[0108] 2. Compression stage:

[0109] Preparation for compression: When the solid waste in the collection box 14 accumulates to a certain amount, the compressing 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, through the interaction between the extension plate 98 and the support bar 99, it pushes the lower baffle 95 downward and fits against the outlet end of the filter element 13, thereby temporarily blocking the fall of solid waste. At this time, the sewage can still pass through the filter element 13 for normal filtration;

[0111] Compressing solid waste: The pressing plate 92 continues to move downward and enters the collection box 14 to compress the collected solid waste inside. The liquid generated during the compression process flows back into the outer box 11 through the filter plate at the bottom of the collection 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. Pump the domestic sewage treated in step S4 into the primary sedimentation tank 60 for natural sedimentation; the treated sludge is refluxed to the anoxic tank 40 through the sludge reflux main pipe 61 and the sludge reflux branch pipe 63 for re-treatment.

[0123] S6. Control 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. The gas in the anoxic gas storage bag 41 is used to backwash the gas pressure regulating tank 80, and control the discharge and reuse of the gas in the gas pressure regulating tank 80. Among them, the gas in the gas pressure regulating tank 80 is guided to the aerobic tank 50 through the aerobic inlet pipe 52, and flows back to the anaerobic tank 30 through the gas reflux pipe 82 and the mixed liquid reflux pipe 51 for re-treatment.

[0124] S7. Repeat steps S2 to S6. After reaching the specified water purification standard, pump the domestic sewage in the primary sedimentation tank 60 into the secondary sedimentation tank 70 for self-chemical phosphorus removal, that is, the treatment of domestic sewage is completed.

[0125] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within 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 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); an upper baffle (96) for blocking the falling of sewage is inserted at the top of the upper positioning sleeve (93); and an extension plate (98) is connected to the interior of the pressure plate (92) via a first spring (97); 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 collection box (14), the solid waste left after the sewage is normally filtered can be temporarily blocked; 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; The water inlet pipe (12) comprises a Y-shaped flow diverter (121) fixed in the outer box (11); a connecting piece is provided on the Y-shaped flow diverter (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 diverter (121) are provided with insertion grooves adapted to the upper baffle (96); the top end of the upper baffle (96) is inserted into the insertion groove so that the insertion groove is blocked; and the top end of the upper baffle (96) is adapted to the inner top wall of the Y-shaped flow diverter (121) so that the top end of the upper baffle (96) can fit with the inner top wall of the Y-shaped flow diverter (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.

2. A multi-stage AAO rural domestic sewage treatment device according to claim 1, characterized in that: The bottom of the inner side of the lower baffle (95) is rotatably connected to a support bar (99) adapted to the end of the extension plate (98) via a U-shaped seat, and 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 be rotated 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 retraction 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: 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).

6. A multi-stage AAO rural domestic sewage treatment device according to claim 5, 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).

7. A multi-stage AAO rural domestic sewage treatment device according to claim 6, 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).

8. A method for using a multi-stage AAO rural domestic sewage treatment device according to any one of claims 6-7, 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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