Rural sewage treatment device

Abstract

The utility model 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 utility model relates to sewage treatment technical field especially relates to a rural sewage treatment device. BACKGROUND

[0002] In recent years, rural sewage treatment has been paid more and more attention, and its treatment equipment has entered a rapid development stage, and various equipment for rural sewage has emerged in endlessly. The built rural sewage treatment facilities are relatively dispersed, and the lack of professional operation and maintenance personnel due to the shortage of operation and maintenance funds, so the rural sewage generally adopts the operation and maintenance mode of "periodic inspection and unattended", in order to facilitate collection and treatment and save investment cost, the rural sewage treatment equipment mostly adopts integrated treatment equipment, which has small land occupation 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 moving bed biofilm reactor (Moving Bed Biofilm Reactor), which is called MBBR process, which is a kind of high-efficiency sewage treatment process, a certain proportion of suspended filler is added in the reactor to strengthen the sewage treatment efficiency.

[0003] In the face of the external environment of rural sewage quality and quantity fluctuation, in order to ensure the stable operation of the process, the flexibility of process operation should be considered in the design stage of some process units, that is, a mixing tank is set on the process flow, the mixing tank can realize the switching of oxygen and anoxic in one tank, the mixing tank is changed into an oxygen tank when nitrification is needed, and the mixing tank is changed into an anoxic tank when denitrification is needed, in order to realize free switching, the aeration system and the stirring system are usually arranged in the mixing tank, the aeration system usually adopts microporous rubber membrane aeration, and the stirring system usually adopts pusher or stirrer, which increases the equipment investment, and the two kinds of equipment are independently installed in one tank, which will affect the installation of the other party to some extent. For the process section with filler in the mixing tank, if the stirring system adopts pusher or stirrer, the filler will directly contact and collide with the equipment, which will cause the wear of the filler and mechanical equipment after a long time, and then affect the sewage treatment effect; if the aeration adopts rubber membrane aeration, the membrane will be aged or blocked after a long time, so it needs to be emptied and maintained or replaced regularly, and since the filler is arranged, the filler will cover the aeration system when it is emptied, which affects the maintenance.

[0004] Therefore, an equipment capable of providing aeration and stirring environment at the same time without direct contact with the filler is needed, and it is also convenient to maintain, which can avoid the wear of the filler and equipment, and save investment cost. CONTENT OF THE UTILITY MODEL

[0005] (I) technical problem to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a rural sewage treatment device, which solves the problems of interference and abrasion between the aeration device and the stirring device installed in the same mixing tank and the filler and the equipment.

[0007] (II) Technical solutions

[0008] In order to achieve the above-mentioned purpose, the utility model adopts the main technical scheme including:

[0009] The utility model provides a rural sewage treatment device, including mixing tank, MBBR filler and aeration stirring integrated equipment, MBBR filler is placed in the inside of mixing tank.

[0010] The flow guide cover is the barrel type structure, and is divided into the upper suction inlet area and the lower acceleration mixing area, a plurality of water holes are arranged on the peripheral wall and the top wall surface of the upper suction inlet area, the size of the water hole is less than the size of the MBBR filler, the bottom end of the lower acceleration mixing area away from the upper suction inlet area is detachably connected with the suction inlet end of the stirring device, and the bottom surface of the connection place of the lower acceleration mixing area and the stirring device is provided with the opening matched with the shape of the suction inlet end of the stirring device.

[0011] The aeration device is arranged in the inside of the lower acceleration mixing area, and the aeration stirring integrated equipment is placed at the bottom of the mixing tank away from the flow guide cover.

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

[0013] The counterweight is fixed to the bottom of the end of the aeration stirring integrated equipment away from the flow guide cover, and the aeration stirring integrated equipment is placed in the middle of the mixing tank.

[0014] Optionally, the aeration device is a nano aeration device, the stirring device is a loop three-dimensional stirrer, and the counterweight is a steel plate, which is fixedly connected to the bottom of the aeration stirring integrated equipment through bolts to form the base of the aeration stirring integrated equipment, and the base directly contacts the bottom of the mixing tank.

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

[0016] Optionally, the aeration device is arranged in the area 20mm-50mm away from the upper suction inlet area, and the aeration pipeline is provided with an aeration control valve, which is an electromagnetic valve or an electric valve.

[0017] Optionally, a carbon source dosing pump is arranged outside the mixing tank, and a carbon source pipeline is connected with the carbon source dosing pump at one end and penetrates into the inside of the flow guide cover at the other end away from the carbon source dosing pump.

[0018] Optionally, the other end of the carbon source pipeline away from the carbon source dosing pump is inserted into the upper suction inlet area, and the insertion distance is within one half to two thirds of the height of the upper suction inlet area, and a carbon source control valve is arranged on the carbon source pipeline, which is an electromagnetic valve or an electric valve.

[0019] Optionally, a blowing device, a blowing pipeline and a blowing gas pump are further included, the blowing gas pump is arranged outside the mixing tank, the blowing device is sleeved outside the lower acceleration mixing area and connected with the blowing gas pump through the blowing pipeline, and the blowing gas pump selectively supplies gas to the blowing device through the blowing pipeline, and the blowing device is provided with a gas outlet facing the upper suction inlet area.

[0020] Optionally, the blowing device is arranged within a range of 10-20 mm from the upper suction inlet area, and a blowing control valve is arranged on the blowing pipeline, which is an electromagnetic valve or an electric valve.

[0021] Optionally, a plurality of fixed traction ropes are further included, one end of each of the fixed traction ropes is connected with the integrated aeration and stirring device, and the other end of each of the fixed traction ropes is fixed outside the mixing tank.

[0022] Optionally, the integrated aeration and stirring device is provided with a same number of traction rope fixing rings as the fixed traction ropes on the side surface, and the fixed traction ropes are fixedly connected to the traction rope fixing rings, and the fixed traction ropes are two groups arranged on the two sides of the integrated aeration and stirring device at an angle of 180 degrees.

[0023] (Three) beneficial effects

[0024] The beneficial effects of the utility model are:

[0025] The utility model discloses a rural sewage treatment device, through increasing the flow guide cover in the mixing tank, and the opening end of flow guide cover is connected with the suction inlet of stirring device, and the aeration device is arranged in the inside of flow guide cover cylinder, so that aeration device and stirring device are integrated, and when installing, the problem of interference no longer occurs, and a plurality of water passing holes with a size less than the filler are arranged on the flow guide cover, the filler is intercepted outside the flow guide cover without affecting the sewage circulation in the tank, so that the filler and the impeller in the suction inlet area of the stirring device are prevented from being contacted and abraded and damaged, or even blocked to cause the motor damage, thereby prolonging the service life of the filler and the equipment and saving the investment cost of the equipment. DRAWINGS

[0026] Figure 1The utility model discloses an integrated aeration and stirring device for a rural sewage treatment device.

[0027] Figure 2 For Figure 1 The structure diagram of embodiment 1 of the rural sewage treatment device in the utility model discloses a rural sewage treatment device.

[0028] Figure 3 The structure diagram of embodiment 2 of the rural sewage treatment device in the utility model discloses a rural sewage treatment device.

[0029] Figure 4 For Figure 2 And Figure 3 The schematic diagram of the circulation three-dimensional stirrer in the rural sewage treatment device in the utility model discloses a rural sewage treatment device.

[0030] Figure 5 For Figure 4 The top view of the circulation three-dimensional stirrer in the utility model discloses a circulation three-dimensional stirrer.

[0031]

Explanation of the drawing mark

[0032] 1: mixing pool;

[0033] 2: MBBR filler;

[0034] 3: integrated aeration and stirring device;31: aeration device;32: stirring device;33: flow guide cover;331: upper suction inlet area;332: lower accelerated mixing area;333: water passage;

[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: purging device;

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

[0042] 11: purging air pump;

[0043] 12: fixed traction rope;13: traction rope fixing ring;

[0044] 20: oxygen. Specific implementation

[0045] For better explaining the utility model, in order to facilitate understanding, below combining with the drawings, by specific embodiment, the utility model is described in detail. Wherein, the "upper", "lower", "left", "right" and other orientation terms mentioned in this paper are with the direction of the figure as reference. Figure 1

[0046] The rural sewage treatment device provided in the embodiment of the utility model, through increasing the fairing in the mixing pool, and the fairing opening end is connected with the suction inlet of the stirring device, and the aeration device is arranged in the fairing barrel body, so that the aeration device and the stirring device are integrated, and the interference problem does not occur again during installation, meanwhile, a plurality of water holes with size less than the filler are arranged on the fairing, the filler is intercepted outside the fairing without affecting the sewage circulation in the pool, the filler is prevented from contacting the suction inlet area of the aeration device and the stirring device in the fairing, and the abrasion between the filler and the equipment is avoided.

[0047] In order to better understand the above technical solutions, the exemplary embodiments of the utility model will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the utility model are shown in the drawings, it should be understood that the utility model 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 clearer and more thorough understanding of the utility model and to enable the scope of the utility model to be completely conveyed to those skilled in the art.

[0048] Embodiment 1:

[0049] With reference to Figure 1 and Figure 2 The rural sewage treatment device provided in the embodiment, comprising a mixing pool 1, MBBR filler 2 and aeration and stirring integrated equipment 3, the MBBR filler 2 is placed in the mixing pool 1, it has good hydrophilicity, easy to form film, not to block, easy to remove film.

[0050] The aeration and stirring integrated equipment 3 includes aeration device 31, stirring device 32 and fairing 33.

[0051] ​The flow guide cover 33 is a barrel type structure, and is divided into an upper suction inlet area 331 and a lower acceleration mixing area 332. The upper suction inlet area 331 is a barrel type structure with an open bottom formed by a peripheral wall and a top wall. The bottom end of the upper suction inlet area 331 is connected to the lower acceleration mixing area 332. A plurality of water passing holes 333 are provided on the peripheral wall and the top wall surface of the upper suction inlet area 331. The size of the water passing holes 333 is smaller than the size of the MBBR filler 2. In this embodiment, MBBR filler 2 with a diameter of 25 mm and a height of 10 mm is preferably used. The water passing holes 333 are preferably uniformly distributed circular holes with a diameter of 8 mm (the size and shape of the water passing holes 333 can be adjusted according to actual needs, and square holes, diamond holes, etc. can also be used as long as they can pass water and intercept the filler 2). The lower acceleration mixing area 332 has no opening in the area, and the bottom end thereof away from the upper suction inlet area 331 is detachably connected to the suction inlet end of the stirring device 32. An opening matching the shape of the suction inlet end of the stirring device 32 is provided on the bottom surface of the connection between the lower acceleration mixing area 332 and the stirring device 32. The aeration device 31 is arranged inside the lower acceleration mixing area 332.

[0052] The flow guide cover 33 is preferably made of a UPVC (Unplasticized Polyvinyl Chloride) plastic pipe. Other plastic and metal materials can also be used according to actual needs. However, if metal materials are selected, attention should be paid to the fact that they can easily rust and corrode when in contact with sewage. Therefore, corrosion prevention 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 flow guide cover 33, so that the installation between the aeration device 31 and the stirring device 32 no longer interferes. At the same time, the MBBR filler 2 is intercepted outside the aeration and stirring integrated equipment 3, so it will not come into contact with the impeller in the suction inlet area of the stirring device 32, avoiding the situation that the MBBR filler 2 is broken and the impeller is worn. Also, the MBBR filler 2 does not block the suction inlet of the stirring device 32, which affects the normal operation of the motor. At the same time, the plurality of water passing holes 333 are provided on the upper suction inlet area 331, so they do not affect the circulation between the mixed liquid inside and outside the aeration and stirring integrated equipment 3.

[0054] The connection between the lower acceleration mixing area 332 and the stirring device 32 is preferably bolted, but other connection methods such as riveting or pin hole connection can also be selected according to actual needs. The upper suction inlet area 331 and the lower acceleration mixing area 332 are preferably equally divided, but their sizes 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 is placed on the bottom of the mixing tank 1 away from the fairing 33. In order to make the aeration and stirring integrated device 3 stand more stably on the bottom of the mixing tank 1, a counterweight 6 is fixed on the bottom of the aeration and stirring integrated device 3 away from the fairing 33. The counterweight 6 is preferably a steel plate which is fixedly connected (or connected by welding, riveting, etc.) on the bottom of the aeration and stirring integrated device 3 (the bottom of the end away from the fairing 33) to form a base of the aeration and stirring integrated device 3, which directly contacts with the bottom of the mixing tank 1.

[0056] The aeration device 31 in the rural sewage treatment device shown in the embodiment is a nano aeration device, and the stirring device 32 is a loop three-dimensional stirrer (as shown in Figure 4 、 Figure 5 The aeration device 32 is arranged in a region 20mm-50mm away from the bottom end of the upper suction inlet area 332, and is connected with the aeration air pump 5 arranged outside the mixing tank 1 through the aeration pipeline 4. The aeration air pump 5 can selectively supply air to the aeration device 32 through the aeration pipeline 4, that is, the aeration device 32 can be opened or closed according to actual needs. In order to facilitate starting and stopping and adjusting the air volume during operation, a control valve 401 is arranged on the aeration pipeline 4. The control valve 401 is preferably an electromagnetic valve or an electric valve.

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

[0058] Meanwhile, the water inlet and the water outlet can be arranged at the required positions on the mixing tank 1 according to actual needs, and ball valves and other control parts are additionally arranged to facilitate the introduction and discharge of the sewage before and after treatment into and out of the mixing tank 1.

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

[0060] When it is needed to provide an oxygen-free working environment for the mixing pool 1, the stirring device 32 is opened, the mixed liquid enters through the upper suction inlet area 331 of the flow guide cover 33, is accelerated in the lower acceleration mixing area 332 of the flow guide cover 33, and is finally sprayed out at 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 uniformly mixed in the mixed liquid outside the aeration and stirring integrated device 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 start the denitrification reaction using the raw water carbon source.

[0061] When it is needed to provide an oxygen-free working environment for the mixing pool 1, the stirring device 32 is opened, the stirring device 32 is opened, the aeration air pump 5 and the aeration control valve 401 are opened, and aeration is started in the lower acceleration mixing area 332. The mixed liquid entering from the upper suction inlet area 331 is fully mixed with the oxygen source in the flow guide cover 33 and starts to accelerate, and then is sprayed out at high speed from the outlet of the stirring device 32, forming an up-and-down circulating flow state. This way can fully mix the mixed liquid rich in oxygen 20 and the MBBR filler 2, improve the mass transfer efficiency, and realize uniform aeration of the aerobic tank. At this time, the nitrifying bacteria on the sludge and the filler start the nitrification reaction. At the same time, aeration can also promote the mixing of the filler and avoid the accumulation of the filler at the suction inlet. The flow state of the oxygen environment working is as shown in Figure 2

[0062] When the device fails or needs to be repaired, the fixed traction rope 12 is lifted at one end outside the mixing pool 1, so that the aeration and stirring integrated device 3 can be lifted out of the water surface for repair or replacement.

[0063] Example 2:

[0064] Referring to Figure 3 , the rural sewage treatment device provided in this embodiment is used to make the effect of the mixing pool in treating sewage better, especially in the case of insufficient raw water carbon source, which will affect the denitrification effect and thus affect the effect of sewage treatment. Therefore, on the basis of example 1, this embodiment increases the carbon source dosing pump 7, the carbon source pipeline 8, the carbon source control valve 801, the purging device 9, the purging pipeline 10, and the purging control valve 101. The same parts as example 1 will not be described here.

[0065] ​The carbon source feeding pump 7 is arranged outside the mixing tank 1, one end of the carbon source pipeline 8 is connected with the carbon source feeding pump 7, and the other end away from the carbon source feeding pump 7 penetrates into the inside of the flow guide cover 33. The carbon source feeding pump 7 can selectively provide carbon source into the inside of the flow guide cover through the carbon source pipeline 8, that is, the carbon source feeding pump 7 can be opened or closed according to actual needs to control whether to add carbon source into the mixing tank 1. In order to better control the amount of added carbon source, a carbon source control valve 801 is arranged on the carbon source pipeline 8, and the carbon source control valve 801 is an electromagnetic valve or an electric valve. After the carbon source is added into the inside of the flow guide cover 33 and mixed with the mixed liquid, it is high-speed sprayed out through the outlet of the stirring device 32, which is beneficial to the full mixing of the carbon source and the mixed liquid in the whole mixing tank 1, can improve the mass transfer efficiency, and strengthen the deoxidization effect. In the embodiment, the end of the carbon source pipeline 8 away from the carbon source feeding pump 7 is inserted into the upper suction inlet area 331, and the insertion distance is within one half to two thirds of the height of the upper suction inlet area 331.

[0066] The purge gas pump 11 is arranged outside the mixing tank 1, the purge device 9 is sleeved outside the lower acceleration mixing area 332, and is connected with the purge gas pump 11 through the purge pipeline 10. The purge gas pump 11 can selectively supply gas 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 is provided with a gas outlet in the direction of the upper suction inlet area 331. In order to facilitate the start and stop of the purge device 9, a purge control valve 101 is arranged on the purge pipeline 10, and the purge control valve 101 is an electromagnetic valve or an electric valve. In the embodiment, the purge device 9 is preferably arranged in the area of 10mm-20mm away from the bottom end of the upper suction inlet area 331. When the equipment works, especially in the oxygen-free working environment (at this time, the aeration device 31 does not work), negative pressure will be generated in the suction inlet area, and part of the MBBR filler 2 will adhere to the outside of the upper suction inlet area 331. At this time, the purge device 9 needs to be opened regularly to blow away the MBBR filler 2 in the suction inlet. In the embodiment, the shape of the purge device 9 is a circular ring, of course, it can also be a square ring or other arbitrary shape ring structure, as long as it can be sleeved outside the flow guide cover 33. Those skilled in the art can select according to actual needs.

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

[0068] When it is needed to provide an oxygen-free working environment for the mixing pool 1, the stirring device 32 is opened, and then the carbon source feeding pump 7 and the carbon source control valve 801 are opened, the mixed liquid enters the upper suction inlet area 331 of the flow guide cover 33, mixes with the added carbon source, is accelerated in the lower acceleration mixing area 332 of the flow guide cover 33, and is finally sprayed out at high speed through the outlet of the stirring device 32, that is, the power for the mixing of the mixed liquid and the filler fluidization is provided, so that the MBBR filler 2 can be uniformly mixed in the mixed liquid outside the aeration and stirring integrated device 3, and the added carbon source can be fully mixed in the whole mixing pool 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 start the denitrification reaction more efficiently by using the added carbon source, and the denitrification effect is strengthened. After a long time of work, negative pressure is generated in the suction inlet area, and part of the MBBR filler 2 is attached outside the upper suction inlet area 331, at this time, the blowing and scattering control valve 101 needs to be opened regularly to scatter the MBBR filler 2 in the suction inlet, and the flow state of the oxygen-free working environment is as shown in Figure 3

[0069] When it is needed to provide an oxygen-free working environment for the mixing pool 1, the stirring device 32 is opened, and then the carbon source feeding pump 7 and the carbon source control valve 801 are opened, the mixed liquid enters the upper suction inlet area 331 of the flow guide cover 33, mixes with the added carbon source, is accelerated in the lower acceleration mixing area 332 of the flow guide cover 33, and is finally sprayed out at high speed through the outlet of the stirring device 32, that is, the power for the mixing of the mixed liquid and the filler fluidization is provided, so that the MBBR filler 2 can be uniformly mixed in the mixed liquid outside the aeration and stirring integrated device 3, and the added carbon source can be fully mixed in the whole mixing pool 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 start the denitrification reaction more efficiently by using the added carbon source, and the denitrification effect is strengthened. After a long time of work, negative pressure is generated in the suction inlet area, and part of the MBBR filler 2 is attached outside the upper suction inlet area 331, at this time, the blowing and scattering control valve 101 needs to be opened regularly to scatter the MBBR filler 2 in the suction inlet, and the flow state of the oxygen-free working environment is as shown in

[0070] At the same time, since the aeration device 31 is opened during the aerobic working, the aeration can also promote the mixing of the filler and avoid the accumulation of the filler in the suction inlet, so generally the MBBR filler 2 will not block the suction inlet during the aerobic working, and therefore the blowing and scattering device 9 does not need to be opened.

[0071] In the description of the present application, it should be understood that the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0072] In the present application, unless otherwise specifically defined and limited, the terms "installation", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0073] ​In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature is "on", "above" and "on" the second feature, which can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature is "under", "below" and "under" the second feature, which can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is lower than that of the second feature.

[0074] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application without contradiction.

[0075] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. Those skilled in the art can modify, modify, replace and modify the above embodiments within the scope of the present application.

Claims

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

2. The rural sewage treatment device according to claim 1, characterized in that it further comprises an aeration pipeline (4), an aeration air pump (5) and a counterweight (6), the aeration air pump (5) is placed outside the mixing tank (1); the aeration device (31) is connected to the aeration air pump (5) through the aeration pipeline (4), and the aeration air pump (5) selectively supplies air to the aeration device (31) through the aeration pipeline (4); the aeration and stirring integrated device (3) is fixed with the counterweight (6) at the bottom end away from the flow guide cover (33), and is placed in the middle of the mixing tank (1).

3. The rural sewage treatment device according to claim 2, characterized in that the aeration device (31) is a nano aeration device; the stirring device (32) is a loop 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) through bolts to form a base of the aeration and stirring integrated device (3), and directly contacts with the bottom of the mixing tank (1); the size of the MBBR fillers (2) is 25mm in diameter and 10mm in height.

4. The rural sewage treatment device according to any one of claims 2-3, characterized in that the aeration device (31) is arranged in an area 20-50mm away from the upper inlet area (331); the aeration pipeline (4) is provided with an aeration control valve (401), which is an electromagnetic valve or an electric valve.

5. The rural sewage treatment device according to any one of claims 1-3, characterized in that it further comprises a carbon source dosing pump (7) and a carbon source pipeline (8), the carbon source dosing pump (7) is placed outside the mixing tank (1). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The carbon source pipeline (8) is connected with the carbon source dosing pump (7) at one end, and the other end is inserted into the inside of the flow guide cover (33); the carbon source dosing pump (7) can selectively provide carbon source for the inside of the flow guide cover (33) through the carbon source pipeline (8).

6. The 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 inlet area (331) to a distance of one-half to two-thirds of the height of the upper suction inlet area (331); The carbon source pipeline (8) is provided with a carbon source control valve (801), which is an electromagnetic valve or an electric valve.

7. The rural sewage treatment device according to any one of claims 1-3, characterized in that, It further comprises a purging device (9), a purging pipeline (10) and a purging gas pump (11); The purging gas pump (11) is arranged outside the mixing tank (1); The purging device (9) is arranged outside the lower acceleration mixing area (332) and is connected with the purging gas pump (11) through the purging pipeline (10); the purging gas pump (11) can selectively supply gas to the purging device (9) through the purging pipeline (10); The purging device (9) is provided with a gas outlet facing the upper suction inlet area (331).

8. The rural sewage treatment device according to claim 7, characterized in that, The purging device (9) is arranged within a distance of 10-20 mm from the upper suction inlet area (331); The purging pipeline (10) is provided with a purging control valve (101), which is an electromagnetic valve or an electric valve.

9. The rural sewage treatment device according to any one of claims 1-3, characterized in that, It further comprises a plurality of groups of fixed traction ropes (12), one end of each fixed traction rope (12) being connected with the aeration and stirring integrated device (3) and the other end being fixed to the outside of the mixing tank (1).

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

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