Rural sewage treatment device

Abstract

The invention relates to the technical field of sewage treatment, in particular to a rural sewage treatment device which comprises a mixing tank, filler in the mixing tank and aeration and stirring integrated equipment. The aeration and stirring integrated equipment comprises an aeration device, a stirring device and a flow guide cover, the flow guide cover is of a barrel-shaped structure and is divided into an upper suction inlet area and a lower accelerated mixing area, and a plurality of water passing holes with the size smaller than that of the filler are formed in the peripheral wall and the top wall surface of the upper suction inlet area; the bottom end of the lower accelerated mixing area is detachably connected with the suction inlet end of the stirring device, and the aeration device is arranged in the lower accelerated mixing area. The aeration device and the stirring device are integrated, so that the problem of interference during installation is solved, and meanwhile, the filler is intercepted on the outer side of the flow guide cover through the water passing holes in the flow guide cover under the condition that the circulation of sewage in a tank is not influenced, so that the filler is prevented from being in contact with an impeller in a suction inlet area of the stirring device to generate abrasion damage and interfere with stable operation of a process; the sewage treatment effect is influenced.

Description

Technical Field

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

[0002] In recent years, rural sewage treatment has received more and more attention and importance, and its treatment equipment has entered a stage of rapid development, with various equipment for rural sewage emerging in an endless stream. The built rural sewage treatment facilities are relatively scattered, and the shortage of operation and maintenance funds often leads to insufficient professional operation and maintenance personnel. Therefore, rural sewage generally adopts the "regular inspection, unattended" operation and maintenance mode. In order to facilitate collection and treatment and save investment costs, most rural sewage treatment equipment adopts integrated treatment equipment. This equipment occupies a small area and the corresponding pool capacity is also small. In order to ensure the treatment effect, the mainstream process route of rural sewage equipment usually adopts the moving bed biofilm reactor (Moving Bed Biofilm Reactor), referred to as MBBR process, which is an efficient sewage treatment process. A certain proportion of suspended fillers are added to the reactor to enhance the sewage treatment efficiency.

[0003] Faced with the external environment of rural sewage water quality and water volume fluctuations, in order to ensure the stable operation of the process, some process units must consider the flexibility of process operation in the design stage, that is, to set up a mixing tank in the process flow, the mixing tank can realize the switch between aerobic and anoxic in one pool, and turn the mixing tank into an aerobic pool when nitrification is needed, and turn the mixing tank into an anoxic pool when denitrification is needed. In order to achieve free switching, an aeration system and a stirring system are usually arranged in the mixing tank at the same time. The aeration system usually adopts microporous rubber membrane aeration, and the stirring system usually adopts a flow pusher or agitator, which will increase the equipment investment. The two equipments are installed independently in a pool, which will affect the installation of each other to a certain extent. For the process section with fillers in the mixing tank, if the stirring system adopts a flow pusher or agitator, the fillers will directly contact and collide with the equipment, which will cause wear of the fillers and mechanical equipment over time, and then affect the sewage treatment effect; if the aeration adopts rubber diaphragm aeration, the diaphragm will age or clog over time, and it needs to be emptied or replaced regularly. Due to the setting of fillers, the fillers will cover the aeration system when emptied, affecting the inspection and maintenance.

[0004] Therefore, a device is needed that can provide an aeration and stirring environment at the same time without direct contact with the filler and is easy to maintain, thus avoiding wear of the filler and equipment and saving investment costs. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a rural sewage treatment device, which solves the problems of interference caused by installing an aeration device and a stirring device in the same mixing tank and direct contact between fillers and equipment, resulting in wear between them.

[0007] (II) Technical solution

[0008] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0009] The invention provides a rural sewage treatment device, comprising a mixing tank, MBBR filler and aeration and stirring integrated equipment, wherein the MBBR filler is placed inside the mixing tank. The aeration and stirring integrated equipment comprises an aeration device, a stirring device and a flow guide cover.

[0010] The deflector is a barrel-shaped structure, and is divided into an upper suction port area and a lower acceleration mixing zone. A number of water holes are provided on the peripheral wall and the top wall surface of the upper suction port area, and the size of the water holes is smaller than the size of the MBBR filler. The bottom end of the lower acceleration mixing zone away from the upper suction port area is detachably connected to the suction port end of the stirring device, and an opening matching the shape of the suction port end of the stirring device is provided on the bottom surface of the connection between the lower acceleration mixing zone and the stirring device.

[0011] The aeration device is arranged inside the lower accelerated mixing zone, and the end of the aeration and stirring integrated equipment away from the guide cover is placed at the bottom of the mixing tank.

[0012] Optionally, it also includes an aeration pipeline, an aeration pump and a counterweight. The aeration pump is placed outside the mixing tank. The aeration device is connected to the aeration pump through the aeration pipeline. The aeration pump can selectively supply air to the aeration device through the aeration pipeline.

[0013] A counterweight is fixed at the bottom of the aeration and stirring integrated device away from the guide cover, and the aeration and stirring integrated device is placed in the middle of the mixing tank.

[0014] Optionally, the aeration device is a nano aeration device, the stirring device is a circulating three-dimensional mixer, and the counterweight is a steel plate, which is fixedly connected to the bottom of the aeration and stirring integrated equipment by bolts to form a base of the aeration and stirring integrated equipment, and the base is directly in contact with the bottom of the mixing tank.

[0015] The size of the MBBR packing is 25 mm in diameter and 10 mm in height.

[0016] Optionally, the aeration device is arranged in the area 20mm-50mm away from the upper suction port area, and an aeration control valve is provided on the aeration pipeline, and the aeration control valve is a solenoid valve or an electric valve.

[0017] Optionally, it also includes a carbon source dosing pump and a carbon source pipeline. The carbon source dosing pump is placed outside the mixing tank, one end of the carbon source pipeline is connected to the carbon source dosing pump, and the end away from the carbon source dosing pump penetrates into the interior of the guide cover. The carbon source dosing pump can selectively provide carbon source to the interior of the guide cover through the carbon source pipeline.

[0018] Optionally, one end of the carbon source pipeline away from the carbon source dosing pump is inserted into the upper suction port area, and the insertion distance is in the range of one half to two thirds of the height of the upper suction port area, and a carbon source control valve is provided on the carbon source pipeline, which is a solenoid valve or an electric valve.

[0019] Optionally, it also includes a purge device, a purge pipeline and a purge air pump. The purge air pump is placed outside the mixing tank. The purge device is mounted outside the lower acceleration mixing zone and is connected to the purge air pump through the purge pipeline. The purge air pump can selectively supply air to the purge device through the purge pipeline. The purge device has an air outlet facing the upper suction port area.

[0020] Optionally, the purge device is arranged in an area 10mm-20mm away from the upper suction port area, and a purge control valve is arranged on the purge pipeline, and the purge control valve is a solenoid valve or an electric valve.

[0021] Optionally, it further includes a plurality of groups of fixed traction ropes, one end of which is connected to the aeration and stirring integrated equipment, and the other end of which is fixed to the outside of the mixing tank.

[0022] Optionally, the aeration and stirring integrated equipment is provided with traction rope fixing rings having the same number as the fixed traction ropes, and the fixed traction ropes are fixedly connected to the traction rope fixing rings. The fixed traction ropes are in two groups and are arranged at 180 degrees on both sides of the aeration and stirring integrated equipment.

[0023] (III) Beneficial effects

[0024] The beneficial effects of the present invention are:

[0025] A rural sewage treatment device of the present invention adds a guide cover in a mixing tank, connects the open end of the guide cover with the suction port of a stirring device, and arranges an aeration device inside the guide cover cylinder, so that the aeration device and the stirring device are integrated into one, and no interference problem will occur during installation. At the same time, a plurality of water holes with a size smaller than the filler are arranged on the guide cover. Without affecting the flow of sewage in the tank, the filler is intercepted on the outside of the guide cover, so as to avoid the filler and the impeller in the suction port area of ​​the stirring device from contacting and causing wear and damage, and even blocking the impeller to cause damage to the motor, thereby improving the service life of the filler and the equipment and saving the investment cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1It is a schematic structural diagram of the aeration and stirring integrated equipment in Example 1 of a rural sewage treatment device of the present invention.

[0027] Figure 2 for Figure 1 A schematic structural diagram of Example 1 of a rural sewage treatment device;

[0028] Figure 3 It is a structural schematic diagram of Embodiment 2 of a rural sewage treatment device of the present invention;

[0029] Figure 4 for Figure 2 and Figure 3 A schematic diagram of a circulating three-dimensional mixer in a rural sewage treatment device;

[0030] Figure 5 for Figure 4 Top view of the medium circulation solid mixer.

[0031] [Description of Reference Numerals]

[0032] 1: Mixing pool;

[0033] 2: MBBR filler;

[0034] 3: Aeration and stirring integrated equipment; 31: Aeration device; 32: Stirring device; 33: Flow guide cover; 331: Upper suction inlet area; 332: Lower accelerated mixing area; 333: Water hole;

[0035] 4: aeration pipeline; 401: aeration control valve;

[0036] 5: Aeration air pump;

[0037] 6: Counterweight;

[0038] 7: Carbon source dosing pump;

[0039] 8: Carbon source pipeline; 801: Carbon source control valve;

[0040] 9: Purge device;

[0041] 10: purge pipeline; 101: purge control valve;

[0042] 11: Purge air pump;

[0043] 12: Fix the traction rope; 13: Fix the traction rope ring;

[0044] 20: Oxygen. DETAILED DESCRIPTION

[0045] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below in conjunction with the accompanying drawings through specific embodiments. Figure 1 The orientation is used as a reference.

[0046] A rural sewage treatment device proposed in an embodiment of the present invention adds a guide cover in a mixing tank, connects the open end of the guide cover with the suction port of a stirring device, and arranges an aeration device inside the guide cover cylinder, so that the aeration device and the stirring device are integrated into one, and no interference problem will occur during installation. At the same time, a plurality of water holes with a size smaller than the filler are arranged on the guide cover. Without affecting the flow of sewage in the tank, the filler is intercepted on the outside of the guide cover, so that the filler is prevented from contacting with the aeration device in the guide cover and the suction port area of ​​the stirring device, thereby avoiding wear between the filler and the equipment.

[0047] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0048] Embodiment 1:

[0049] Reference Figure 1 and Figure 2 The present embodiment provides a rural sewage treatment device, comprising a mixing tank 1, an MBBR filler 2 and an aeration and stirring integrated device 3. The MBBR filler 2 is placed inside the mixing tank 1, has good hydrophilicity, is easy to form a biofilm, does not agglomerate, does not clog, and is easy to remove.

[0050] The aeration and stirring integrated equipment 3 includes an aeration device 31 , a stirring device 32 and a flow guide cover 33 .

[0051] The deflector 33 is a barrel-shaped structure, and is divided into an upper suction port area 331 and a lower acceleration mixing area 332. The upper suction port area 331 is a barrel-shaped structure with a bottom opening formed by a peripheral wall and a top wall. The bottom end of the upper suction port area 331 is connected to the lower acceleration mixing area 332. A plurality of water holes 333 are provided on the peripheral wall and the top wall surface of the upper suction port area 331. The size of the water holes 333 is smaller than that of the MBBR filler 2. In this embodiment, the MBBR filler 2 with a diameter of 25 mm and a height of 10 mm is preferably used. The water holes 333 are preferably evenly distributed. A circular hole with a diameter of 8 mm (the size and shape of the water hole 333 can be adjusted according to actual needs, and a square hole, a diamond hole, etc. can also be used, as long as it can simultaneously meet the needs of water passing and intercepting the filler 2); there is no opening in the lower acceleration mixing zone 332, and its bottom end away from the upper suction port area 331 is detachably connected to the suction port end of the stirring device 32, and an opening matching the shape of the suction port end of the stirring device 32 is provided on the bottom surface of the connection between the lower acceleration mixing zone 332 and the stirring device 32, and the aeration device 31 is arranged inside the lower acceleration mixing zone 332.

[0052] The deflector 33 is preferably made of a plastic pipe made of UPVC (full name: Unplasticized Polyvinyl Chloride), and can also be made of other plastic and metal materials according to actual needs. However, if metal materials are used, it should be noted that they are prone to rust and corrosion when in contact with sewage, and anti-corrosion treatment should be done in advance.

[0053] In this way, the aeration device 31 and the stirring device 32 are integrated into the aeration and stirring integrated equipment 3 through the guide cover 33, so that the installation between the aeration device 31 and the stirring device 32 will no longer cause interference, and the MBBR filler 2 is intercepted outside the aeration and stirring integrated equipment 3, and it will no longer come into contact with the impeller in the suction port area of ​​the stirring device 32, thereby avoiding the occurrence of MBBR filler 2 breakage and impeller wear, and also avoiding the MBBR filler 2 blocking the suction port of the stirring device 32 and affecting the normal operation of the motor. At the same time, a number of water holes 333 are set on the upper suction port area 331, so it will not affect the circulation of the mixed liquid inside and outside the aeration and stirring integrated equipment 3.

[0054] The connection between the lower accelerating mixing zone 332 and the stirring device 32 is preferably bolted, and of course, those skilled in the art can also select other connection methods according to actual needs, such as riveting or pin hole connection, etc. The upper suction port area 331 and the lower accelerating mixing zone 332 are preferably divided into equal parts, and the sizes of the two parts can also be adjusted according to actual needs.

[0055] The aeration and stirring integrated device 3 is placed in the middle of the mixing tank 1, and its end away from the guide cover 33 is placed on the bottom of the mixing tank 1. In order to make the aeration and stirring integrated device 3 stand more firmly on the bottom of the mixing tank 1, a counterweight 6 is fixed to the bottom of the aeration and stirring integrated device 3 away from the guide cover 33. The counterweight 6 is preferably made of a steel plate, which is fixedly connected to the bottom of the aeration and stirring integrated device 3 (away from the bottom of the end of the guide cover 33) by bolts (welding, riveting, etc. can also be used) to form the base of the aeration and stirring integrated device 3, and the base is directly in contact with the bottom of the mixing tank 1.

[0056] The aeration device 31 in the rural sewage treatment device shown in this embodiment is a nano aeration device, and the stirring device 32 is a circulating three-dimensional mixer (such as Figure 4 , Figure 5 As shown in the figure, the aeration device 32 is arranged in the area of ​​20mm-50mm from the bottom of the upper suction port area 332, and is connected to the aeration pump 5 arranged outside the mixing tank 1 through the aeration pipeline 4. The aeration pump 5 can selectively supply air to the aeration device 31 through the aeration pipeline 4, that is, the aeration device 32 can be opened or closed according to actual needs. In order to facilitate the start and stop and adjust the gas volume during operation, a control valve 401 is provided on the aeration pipeline 4, and the control valve 401 is preferably a solenoid valve or an electric valve.

[0057] In order to facilitate the inspection and maintenance of the aeration and mixing integrated equipment 3, the device is also provided with a plurality of fixed traction ropes 12, one end of which is connected to the aeration and mixing integrated equipment 3, and the other end is fixed to the outside of the mixing tank 1. In this embodiment, two traction rope fixing rings 13 are preferably provided on both sides of the aeration and mixing integrated equipment 3, and one end of the fixed traction rope 12 inside the mixing tank 1 is fixedly connected to the traction rope fixing ring 13, and is arranged at 180 degrees on both sides of the aeration and mixing integrated equipment. When a problem occurs with the equipment, the aeration and mixing integrated equipment 3 can be lifted out of the water for inspection or replacement by the fixed traction rope 12 without stopping the water, which is simple and convenient to operate.

[0058] At the same time, a water inlet and a water outlet can be set at the required position on the mixing tank 1 according to actual needs, and control parts such as ball valves can be added to facilitate the introduction and extraction of untreated and treated sewage into and out of the mixing tank 1.

[0059] The use process of this embodiment 1 is briefly described as follows:

[0060] When it is necessary to provide an anaerobic working environment for the mixing tank 1, the stirring device 32 is turned on, and the mixed liquid enters through the upper suction port area 331 of the guide cover 33, is accelerated in the lower acceleration mixing area 332 in the guide cover 33, and finally is ejected at high speed through the outlet of the stirring device 32, providing power for the fluidization of the mixed liquid and the filler, so that the MBBR filler 2 can be evenly mixed in the mixed liquid outside the aeration and stirring integrated equipment 3, and the mixed liquid can fully contact the biofilm on the surface of the MBBR filler 2. At this time, the denitrifying bacteria on the sludge and the filler can use the raw water carbon source to start the denitrification reaction.

[0061] When it is necessary to provide an aerobic working environment for the mixing tank 1, turn on the stirring device 32 while turning on the aeration pump 5 and the aeration control valve 401, and start aeration in the lower acceleration mixing zone 332. The mixed liquid entering from the upper suction port area 331 is continuously mixed with oxygen in the guide cover 33 and begins to accelerate, and then is ejected at high speed from the outlet of the stirring device 32 to form an up and down circulation flow pattern. This method allows the mixed liquid rich in oxygen 20 and the MBBR filler 2 to be fully mixed, improves the mass transfer efficiency, and realizes uniform aeration of the aerobic tank. At this time, the nitrifying bacteria on the sludge and filler begin to undergo nitrification reactions. At the same time, aeration can also promote the mixing of fillers to avoid the accumulation of fillers at the suction port. The flow pattern of the aerobic environment is as follows: Figure 2 shown.

[0062] When the equipment fails or needs to be repaired, there is no need to drain the water. The fixed traction rope 12 is placed outside the mixing tank 1 and one end is lifted, so that the aeration and mixing integrated equipment 3 can be lifted out of the water for repair or replacement.

[0063] Embodiment 2:

[0064] Reference Figure 3 The present embodiment provides a rural sewage treatment device, in order to make the mixing tank treat sewage better, especially when the raw water carbon source is insufficient, which will affect the denitrification and denitrification effect, thereby affecting the sewage treatment effect. Therefore, on the basis of Example 1, the present embodiment adds a carbon source dosing pump 7, a carbon source pipeline 8, a carbon source control valve 801, a purge device 9, a purge pipeline 10 and a purge control valve 101. The same parts as Example 1 will not be repeated here.

[0065] The carbon source dosing pump 7 is arranged outside the mixing tank 1, one end of the carbon source pipeline 8 is connected to the carbon source dosing pump 7, and the end away from the carbon source dosing pump 7 penetrates into the interior of the guide cover 33. The carbon source dosing pump 7 can selectively provide the carbon source to the interior of the guide cover through the carbon source pipeline 8, that is, the carbon source dosing pump 7 can be turned on or off according to actual needs to control whether to add carbon source to the mixing tank 1. In order to better control the amount of added carbon source, a carbon source control valve 801 is provided on the carbon source pipeline 8, and the carbon source control valve 801 is a solenoid valve or an electric valve. After the carbon source is added to the interior of the guide cover 33 and mixed with the mixed liquid, it is ejected at a high speed through the outlet of the stirring device 32, which is conducive to the full mixing of the carbon source with the mixed liquid in the entire mixing tank 1, which can improve the mass transfer efficiency and enhance the deoxygenation effect. In this embodiment, it is preferred that the end of the carbon source pipeline 8 away from the carbon source dosing pump 7 is inserted into the upper suction port area 331 , and the insertion distance is within a range of one half to two thirds of the height of the upper suction port area 331 .

[0066] The purge air pump 11 is placed outside the mixing tank 1, and the purge device 9 is sleeved outside the lower accelerated mixing zone 332 and connected to the purge air pump 11 through the purge pipeline 10. The purge air pump 11 can selectively supply air to the purge device through the purge pipeline, that is, the purge device 9 can be opened or closed according to actual needs. The purge device 9 has an air outlet facing the upper suction port area 331. In order to facilitate the control of the start and stop of the purge device 9, a purge control valve 101 is provided on the purge pipeline 10, and the purge control valve 101 is a solenoid valve or an electric valve. In this embodiment, the purge device 9 is preferably arranged in an area of ​​10mm-20mm away from the bottom of the upper suction port area 331. When the equipment is working, especially in an oxygen-free working environment (the aeration device 31 is not working at this time), negative pressure will be generated in the suction port area, and part of the MBBR filler 2 will adhere to the outside of the upper suction port area 331. At this time, it is necessary to regularly open the purge device 9 to blow away the MBBR filler 2 at the suction port. In this embodiment, the purge device 9 is in the shape of a circular ring. Of course, it can also be a square ring or an annular structure of any other shape, as long as it can be set on the outside of the guide cover 33. Those skilled in the art can choose according to actual needs.

[0067] The use process of this embodiment 2 is briefly described as follows:

[0068] When it is necessary to provide an anaerobic working environment for the mixing tank 1, the stirring device 32 is turned on, and then the carbon source dosing pump 7 and the carbon source control valve 801 are turned on. The mixed liquid enters through the upper suction port area 331 of the guide cover 33, mixes with the external carbon source, and is accelerated in the lower acceleration mixing area 332 in the guide cover 33. Finally, it is ejected at a high speed through the outlet of the stirring device 32, which provides power for the fluidization of the mixed liquid and the filler, so that the MBBR filler 2 can be evenly mixed in the mixed liquid outside the aeration and stirring integrated equipment 3, and the external carbon source can be fully mixed in the entire mixing tank 1. At this time, the mixed liquid can fully contact the biofilm on the surface of the MBBR filler 2. At this time, the denitrifying bacteria on the sludge and the filler can use the external carbon source to start a more efficient denitrification reaction, thereby enhancing the denitrification effect. After working for a long time, negative pressure will be generated in the suction port area, and part of the MBBR filler 2 will adhere to the outside of the upper suction port area 331. At this time, it is necessary to open the purge control valve 101 regularly to blow away the MBBR filler 2 at the suction port. The flow state of the oxygen-free environment is as follows: Figure 3 shown.

[0070] When it is necessary to provide an aerobic working environment for the mixing tank 1 and when the equipment fails or needs to be repaired and maintained, the operation is the same as in Example 1 and will not be described in detail here.

[0071] At the same time, since the aeration device 31 is turned on during aerobic operation, aeration can also promote the mixing of the filler and prevent the filler from accumulating at the suction port. Therefore, under normal circumstances, the MBBR filler 2 will not block the suction port during aerobic operation, so there is no need to turn on the purge device 9.

[0072] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0073] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0075] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0076] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A rural sewage treatment device, characterized in that: It comprises a mixing tank (1), MBBR filler (2) and aeration and stirring integrated equipment (3), wherein the MBBR filler (2) is placed inside the mixing tank (1); The aeration and stirring integrated equipment (3) comprises an aeration device (31), a stirring device (32) and a flow guide cover (33); The deflector (33) is a barrel-shaped structure and is divided into an upper suction port area (331) and a lower acceleration mixing area (332); A plurality of water holes (333) are provided on the peripheral wall and the top wall surface of the upper suction port area (331), and the size of the water holes (333) is smaller than the size of the MBBR filler (2); The bottom end of the lower accelerating mixing zone (332) away from the upper suction port zone (331) is detachably connected to the suction port end of the stirring device (32), and an opening matching the shape of the suction port end of the stirring device (32) is provided on the bottom surface of the connection between the lower accelerating mixing zone (332) and the stirring device (32); The aeration device (31) is arranged inside the lower accelerated mixing zone (332). The end of the integrated aeration and stirring device (3) away from the flow guide cover (33) is placed at the bottom of the mixing tank.

2. A rural sewage treatment device according to claim 1, characterized in that: It also includes an aeration pipeline (4), an aeration air pump (5) and a counterweight (6), wherein the aeration air pump (5) is placed outside the mixing tank (1); The aeration device (31) is connected to the aeration air pump (5) via the aeration pipeline (4), and the aeration air pump (5) can selectively supply air to the aeration device (31) via the aeration pipeline (4); A counterweight (6) is fixed to the bottom of the end of the aeration and stirring integrated device (3) away from the guide cover (33), and the aeration and stirring integrated device (3) is placed in the middle of the mixing tank (1).

3. A rural sewage treatment device according to claim 1, characterized in that: The aeration device (31) is a nano aeration device; The stirring device (32) is a circulating three-dimensional stirrer; The counterweight (6) is a steel plate, which is fixedly connected to the bottom of the aeration and stirring integrated device (3) by means of bolts to form a base of the aeration and stirring integrated device (3), and the base is in direct contact with the bottom of the mixing tank (1). The size of the MBBR filler (2) is 25 mm in diameter and 10 mm in height.

4. A rural sewage treatment device according to any one of claims 1 to 3, characterized in that: The aeration device (31) is arranged in the area 20 mm to 50 mm away from the upper suction port area (331); The aeration pipeline (4) is provided with an aeration control valve (401), and the aeration control valve (401) is a solenoid valve or an electric valve.

5. A rural sewage treatment device according to any one of claims 1 to 3, characterized in that: It also includes a carbon source dosing pump (7) and a carbon source pipeline (8), wherein the carbon source dosing pump (7) is placed outside the mixing tank (1); One end of the carbon source pipeline (8) is connected to the carbon source dosing pump (7), and the end away from the carbon source dosing pump (7) penetrates into the interior of the guide cover (33); the carbon source dosing pump (7) can selectively provide the carbon source to the interior of the guide cover (33) through the carbon source pipeline (8).

6. A rural sewage treatment device according to claim 5, characterized in that: The end of the carbon source pipeline (8) away from the carbon source dosing pump (7) is inserted into the upper suction port area (331), and the insertion distance is within a range of one half to two thirds of the height of the upper suction port area (331); The carbon source pipeline (8) is provided with a carbon source control valve (801), and the carbon source control valve (801) is a solenoid valve or an electric valve.

7. A rural sewage treatment device according to any one of claims 1 to 3, characterized in that: It also includes a purge device (9), a purge pipeline (10) and a purge air pump (11); The purge air pump (11) is placed outside the mixing tank (1); The purge device (9) is sleeved outside the lower acceleration mixing zone (332) and is connected to the purge air pump (11) via the purge pipeline (10). The purge air pump (11) can selectively supply air to the purge device (9) via the purge pipeline (10). The purge device (9) is provided with an air outlet in the direction of the upper suction port area (331).

8. A rural sewage treatment device according to claim 7, characterized in that: The purge device (9) is arranged in an area 10 mm to 20 mm away from the upper suction port area (331); The purge pipeline (10) is provided with a purge control valve (101), and the purge control valve (101) is a solenoid valve or an electric valve.

9. A rural sewage treatment device according to any one of claims 1 to 3, characterized in that: It also includes a plurality of groups of fixed traction ropes (12), one end of each of the fixed traction ropes (12) being connected to the integrated aeration and stirring equipment (3) and the other end of each of the fixed traction ropes (12) being fixed to the outside of the mixing tank (1).

10. A rural sewage treatment device according to claim 9, characterized in that: The aeration and stirring integrated equipment (3) is provided with the same number of traction rope fixing rings (13) as the fixed traction ropes (12) on the side surface, and the fixed traction ropes (12) are fixedly connected to the traction rope fixing rings (13); The fixed traction ropes (12) are in two groups and are arranged at 180 degrees on both sides of the aeration and stirring integrated equipment (3).

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