CN106746188B - A rural domestic sewage treatment system - Google Patents

Abstract

The invention provides a rural domestic sewage treatment system, and belongs to the technical field of sewage treatment. It has solved the imperfect and odor that sewage produced of the existing sewage treatment plant causes technical problems such as the pollution to the atmosphere. The rural domestic sewage treatment system is characterized by comprising an aeration tank for decomposing organic matters in sewage, an artificial wetland and a purification tank, wherein the aeration tank comprises a tank body, and an aeration generating device, an aeration diffusion device, a foam eliminating device and a sludge recovery device are arranged in the tank body. The invention has the advantages of good sewage treatment effect and the like.

Description

A rural domestic sewage treatment system

technical field

The invention belongs to the technical field of sewage treatment and relates to a rural domestic sewage treatment system.

Background technique

Since the reform and opening up, my country's industrialization level has been continuously improved. While we are enjoying the achievements of rapid GDP growth, environmental pollution hinders sustainable economic development has become a problem that cannot be ignored. In the past ten years, the rural ecological environment has become a matter of great concern to everyone. The threat to the rural ecological environment not only comes from the development of township industrial enterprises, but also has a major relationship with the production in the countryside, livestock and poultry breeding, rural domestic sewage treatment methods, and the environmental protection awareness of relevant rural entities. my country's rural areas and population account for a large proportion of the country's area and population. Solving rural domestic sewage and improving the rural ecological environment will undoubtedly help rural residents live and work in peace and contentment, sustainable development of the rural economy, and national harmony and stability. The problem of domestic sewage in rural areas is not only related to the health of farmers, but also related to the improvement of rural ecological environment and the harmony of rural society. Water environment protection is the focus of current environmental protection work, and rural domestic sewage treatment is an important part of water pollution prevention and control. With the development of my country's rural social economy, the improvement of rural living standards and the growth of population, the discharge of domestic sewage pollutants directly affects the quality of water bodies. Rural residences are scattered, the economic conditions are quite different, the construction of sewage pipe network and sewage treatment facilities is relatively lagging behind, and the water quality and quantity of rural domestic sewage are also different. The construction of sewage treatment projects needs to be based on the local environment and natural conditions, economic affordability, etc. Different sewage treatment methods are selected according to local conditions, mainly including centralized treatment after sewage collection into the network and decentralized treatment after sewage collection.

Domestic sewage treatment in rural areas mainly includes nitrification treatment (aeration treatment), denitrification treatment and constructed wetland treatment, etc. There are certain imperfections in nitrification treatment, denitrification treatment and constructed wetland treatment, such as imperfect nitrification treatment equipment, constructed wetland treatment, etc. The treatment causes secondary land and air pollution.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned problems in the existing technology, and propose a rural domestic sewage treatment system to improve the effect and efficiency of sewage treatment and reduce environmental pollution.

The purpose of the present invention can be achieved through the following technical solutions: a rural domestic sewage treatment system, characterized in that, the treatment system includes an aeration tank that decomposes organic matter in sewage, and includes a constructed wetland and a purification tank. The aeration tank includes a pool body, the pool body has a third sewage discharge inlet and a third sewage discharge outlet, the third sewage discharge inlet is connected to the liquid outlet solenoid valve through a pipeline, and the middle The liquid storage tank is communicated with the third sewage discharge inlet through a pipeline, and an aeration generating device, an aeration diffusion device, a foam elimination device and a sludge recovery device are arranged in the pool body, and the aeration generating device It includes a propeller impeller arranged at the bottom of the pool, the propeller impeller includes a blade and a hub, the blade has an inner cavity, and the top surface of the blade is provided with a number of air outlets communicating with the inner cavity of the blade, The blade is fixed to the hub, and the hub has an air intake cavity inside, and the intake cavity communicates with the inner cavity of the blade, and the bottom of the hub has an air inlet connected to the air intake cavity, and the air inlet of the air inlet An air delivery pipe is arranged at the bottom, the top of the air delivery pipe is in the air inlet and fits with the air inlet in a gap, the bottom end of the air delivery pipe is connected with a corner joint, and the corner joint is connected to an air pump through a pipeline, the An impeller rotating shaft is arranged in the gas delivery pipe, the top of the impeller rotating shaft is fixed to the hub, and the bottom end of the impeller rotating shaft passes through the corner joint and is connected with an output shaft of a motor. The motor rotates the propeller impeller, the air pump enters the air into the cavity of the blade through the pipeline, and the air emerges from the air outlet of the blade upwards, and the sewage in the aeration tank is discharged during the rotation of the blade. Stir to make the air coming out of the air outlet of the paddle fully contact with the sewage. The air emerges from the air outlet of the paddle, which has the advantages of many and dense bubbles, improves the efficiency of dissolved oxygen in the sewage, and promotes the active sewage in the aeration tank. The activity of aerobic bacteria in mud can improve the treatment effect of sewage.

The aeration and diffusion device includes a drainage hood, the drainage hood is in the shape of an inverted funnel, the upper end of the drainage hood is a closed end, the upper side wall of the drainage hood is provided with several openings, and the lower end of the drainage hood is an open end. , the draft hood is arranged above the propeller impeller, so that the propeller impeller is in the opening at the lower end of the draft hood, and a vesicle net for refining air bubbles is also arranged in the opening at the lower end of the draft hood , the filter net is located above the paddle, and the upper end of the drainage cover is also provided with a number of olive-shaped bubble retention chambers, the bubble retention chambers are arranged horizontally along its axis, and the bubble retention chambers There are openings on both sides of the air bubble retention chamber, and the opening on one side of the bubble retention chamber communicates with the opening on the upper side wall of the drainage cover; a spiral drainage tube is vertically arranged in the drainage cover, and the bottom end of the drainage tube A drainage sub-hood is connected, and the top of the drainage pipe extends into the bubble retention chamber; through the aeration diffusion device, the air bubbles generated by the aeration generating device can better contact with the sewage, and the air bubbles emerging from the propeller blades to It rises up into the drainage hood, passes through the filter bubble net, and divides the larger air bubbles into smaller bubbles, thereby increasing the number of bubbles, increasing the contact area between the bubbles and the sewage, and part of the bubbles passing through the filter bubble net directly enters In the bubble retention chamber, the other part of the bubbles passing through the filter bubble net enters the drainage tube from the drainage sub-hood. The drainage tube is in a spiral shape, and the bubbles spiral up in the drainage tube, increasing the rising path of the bubbles and increasing the contact time between the bubbles and the sewage, thus Improve the dissolved oxygen effect of the sewage, thereby enhancing the activity of aerobic bacteria in the activated sludge and improving the efficiency of sewage treatment. The air bubbles will emerge from the top of the drainage pipe and enter the air bubble retention chamber. The air bubble retention chamber is like an olive placed horizontally. shape, so that the air entering the bubble temporary chamber stays in the bubble temporary chamber for a short time, improving the effect of dissolved oxygen in the air and sewage. When the air bubbles in the drainage tube and the drainage hood continuously enter the bubble temporary chamber, the The air in the temporary storage room is expelled to continuously replace the fresh air in the temporary storage room of the air bubbles.

The foam elimination device includes several water spray pipes horizontally arranged on the surface of the aeration tank, the water spray pipes are in the shape of waves up and down, one end of the water spray pipe is a closed end, and the other end is an input end, The bottom of the water spray pipe is provided with some water spray holes toward the bottom of the pool, and the several water spray holes are evenly distributed along the length direction of the water spray pipe. The water main pipe is connected with a booster water pump; the closed ends of the several water spray pipes are fixedly connected with a connecting rod, so that the several water spray pipes are evenly distributed along the length direction of the connecting rod, and the water delivery main pipe and the connecting rod are along the There are a number of floating balls in the length direction; during the aeration process of the sewage in the aeration tank, a large amount of foam will be generated to float on the water surface of the sewage pool, blocking the dissolved oxygen between the sewage pool surface and the outside air, so the foam needs to be eliminated. The traditional method is to add foam elimination agent to the sewage for defoaming treatment, which increases the cost of sewage treatment. The foam elimination agent will also cause a certain amount of secondary pollution. Through the foam elimination device, the foam generated in the sewage of the aeration tank is eliminated. , the principle is to use the water sprayed by the water spray pipe to disperse the foam. The water spray pipe is in a wave shape up and down, so that part of the water spray hole at the bottom of the water spray pipe is above the pool surface, and part of it is below the pool surface. The water sprayed from the water spray hole above the pool surface will disperse the foam on the surface of the pool surface, and the water sprayed from the water spray hole below the pool surface will disperse the foam that is about to rise to the pool surface below the pool surface , improve the effect and efficiency of foam elimination, the function of the set floating ball is to make the water spray pipe float on the pool surface, and by setting the number of floating balls, a part of the water spray pipe is above the pool surface and a part is below the pool surface.

The sludge recovery device includes a sludge collection box arranged at the bottom of the aeration tank, a number of sludge inlets are provided on the side of the sludge collection box, and the sludge inlets are fixed with sludge inlets. The sludge inlet nozzle is funnel-shaped, including an inlet end and an outlet end. The diameter of the inlet end is larger than the diameter of the outlet end. The inlet end of the sludge inlet nozzle is connected and fixed with the sludge inlet, and the outlet of the sludge inlet nozzle end stretches into the box body of the sludge collection box, the top of the sludge collection box is provided with a water outlet, and the water outlet is connected to a pump through a pipeline, and the sludge collection box is horizontally arranged near the water outlet There is a sludge filter. During the aeration treatment process of the aeration tank, the aerobic bacteria in the activated sludge in the aeration tank will produce new activated sludge during the reaction process with the organic matter in the sewage. When there is too much activated sludge, it will affect the aeration The reaction affects the effect of sewage treatment, and excessive activated sludge needs to be treated. The excess sludge is collected through the sludge collection box, and the sewage in the sludge collection box is pumped through the pump, so that the sewage outside the sludge collection box enters the sludge collection box through the sludge inlet nozzle, The activated sludge suspended in the sewage enters the sludge collection box and is blocked by the sludge filter. The sewage enters from the outlet through the sludge filter and is discharged by the pump. In the sludge collection box, water is continuously circulated to collect the sludge into the sludge collection box. The sludge inlet mouth is funnel-shaped, so that the activated sludge in the pool water can easily enter the sludge collection box, and at the same time, the activated sludge in the sludge collection box is not easy to escape from the sludge collection box.

The above-mentioned aeration generating device also includes an excavating mechanism for loosening the sludge at the bottom of the aeration tank. The excavating mechanism includes a horizontally arranged excavating wheel, and the excavating wheel includes a ring-shaped wheel plate. The circumference of the wheel plate Digging teeth are opened towards the bottom, and the digging teeth are in contact with the bottom of the aeration tank, and the digging wheel is connected with the part where the bottom end of the impeller rotating shaft passes through the corner joint. Through the excavation mechanism, the activated sludge deposited on the bottom of the pool is loosened, so that it is better suspended in the pool water, and the effect of sewage treatment is improved. The impeller shaft that drives the propeller to rotate drives the excavation wheel together during the rotation process. Rotate, and use the excavating teeth provided by the excavating wheel plate to loosen the deposited sludge.

The above-mentioned artificial wetland includes a conservation pond, and the conservation pond includes a pool body made of concrete, and the pool body includes a fourth sewage discharge inlet and a fourth sewage discharge outlet, and the fourth sewage discharge inlet is connected to the said sewage discharge inlet through a pipeline. The third sewage outlet is connected, the upper layer of the pool body is planted with emergent plants, the lower layer of the pool body is planted with submerged plants, and the emergent plants are planted on a floating platform, and the floating platform includes sequentially A nylon layer, a sandstone layer, and a soil layer stacked from bottom to top, the nylon layer includes a pair of mesh plates 1 arranged parallel to each other, nylon threads are laminated between the mesh plates 1, and the sand The stone layer includes a pair of mesh plates 2 arranged parallel to each other, and sand and gravel are filled between the mesh plates 2, and the soil layer includes a pair of mesh plates 3 arranged parallel to each other, and the space between the mesh plates 3 is filled with Soil, the emergent plants are planted on the soil layer, the periphery of the net plate 1, net plate 2 and net plate 3 are fixed on a retainer and are stacked and fixed with each other by the retainer, the retainer A number of floating boxes are fixed on the frame; the bottom of the conservation pond is filled with soil, and the soil is covered with mesh panels, and the submerged plants are planted in the soil at the bottom of the conservation pond. In traditional artificial wetlands, plants are directly planted in artificially excavated ponds. When the water level in the wetland is too low, it is easy to cause insufficient water supply for the conservation of emergent plants, causing the plants to die of drought. When the water level in the wetland is too high, it is easy to submerge the emergent plants. , to submerge the emergent plants to death, at the same time, the sewage will also cause certain pollution to the soil of the wetland. The emergent plants in the artificial wetland are planted on the floating platform, which is not affected by the water level in the wetland. By adjusting the number of floating boxes, the floating platform is at the water level where the emergent plants grow better. The floating platform includes The nylon layer, the sand layer and the soil layer stacked up in sequence can make the water penetrate from the nylon layer to the sand layer, and then penetrate into the soil layer to ensure the water supply for plant growth and prevent the soil layer from soiling. For the purpose of draining to the bottom of the pool, the nylon layer is made of nylon threads stacked to prevent sand and gravel from falling into the bottom of the pool, and the nylon thread has good anti-corrosion properties. The bottom of the conservation pond is filled with soil, the submerged plants are planted in the soil at the bottom of the conservation pond, and the soil is covered with a mesh plate to prevent soil loss at the bottom of the pond during the flow of sewage. The body of the conservation pond is made of concrete, which can prevent sewage from polluting the soil.

The top of the above-mentioned conservation pond is provided with a hemispherical air-drainage cover, the bottom end of the air-drainage cover is an open end, and the top is a closed structure, and the bottom end of the air-drainage cover covers the pool body of the conservation pond. Both sides of the bottom of the air-drainage hood are provided with air vents, and the top of the air-drainage hood is provided with an exhaust hole. The exhaust hole is connected to an air pump through a pipeline, and the other end of the air-suction pump is connected to an air pump through a pipeline. The odor treatment box is connected, and the odor treatment box includes a box body. One side of the box body is provided with an air inlet, and is connected to the air pump through a pipeline, and the other side of the box body is provided with an air outlet. , the box is provided with several air filter layers, the air filter layers include air filter sandwich nets, and activated carbon is sandwiched between the air filter sandwich nets. Constructed wetlands will produce a certain amount of odor in the process of sewage treatment. If these odors are not treated, they will pollute the atmosphere and affect the lives of nearby residents. The air drainage cover will surround the artificial wetland conservation pool, so that the generated odor will enter the drainage In the hood, under the suction of the odor pump, the air is pumped into the odor treatment box. There are several air filter layers equipped with activated carbon in the odor treatment box to absorb the odor in the air and discharge the fresh air to the In the atmosphere, the air filter layer is arranged in several layers to improve the effect of air filter. Both sides of the bottom of the air-drainage hood are provided with air vents, the purpose of which is to allow external fresh air to enter the air-drainage hood for the needs of plant growth.

The above purification pool includes a first-level pool body, a second-level pool body, a third-level pool body and a fourth-level pool body distributed step by step from top to bottom, the first-level pool body has a fifth sewage discharge inlet, and the four-level pool body has a fifth sewage discharge inlet. The first-level pool body has a fifth sewage outlet, and the first-level pool body is provided with a first drainage port, and the pool water in the first-level pool body is discharged to the second-level pool body through the first drainage port. The pool body is provided with a second drainage port, and the pool water in the secondary pool body is discharged to the tertiary pool body through the second drainage port, and the tertiary pool body is provided with a third drainage port, and the tertiary pool body is provided with a third drainage port. The pool water in the body is discharged to the fourth-stage pool body through the third drainage port; a gravel filter layer is arranged in the first drainage port, a sandstone filter layer is arranged in the second drainage port, and a gravel filter layer is arranged in the third drainage port. With activated carbon adsorption layer. The sewage treated by the artificial wetland is purified through the purification tank. The water to be purified on the purification tank flows through the first-level pool, the second-level pool, the third-level pool and the fourth-level pool from top to bottom, and passes through the gravel The filter layer, the sand filter layer and the activated carbon adsorption layer are filtered step by step. The gravel filter layer has a larger gap to filter larger particle impurities, and the sand filter layer has a smaller gap to filter smaller particle impurities. Activated carbon adsorption The layer absorbs harmful substances in the water.

The above-mentioned gravel filter layer includes several groups of gravel meshes, the gravel meshes clamp gravel, and the several groups of gravel meshes are juxtaposed against and block the first drainage port, and the sand filter The layer includes several groups of sand and gravel meshes, the sand and gravel meshes hold sand and gravel, and the several groups of sand and gravel meshes are juxtaposed against and block the second drainage port, and the activated carbon adsorption layer It includes several sets of activated carbon clamping nets, the activated carbon clamping nets clamp activated carbon, and the several groups of activated carbon clamping nets are arranged side by side to block the third drainage port. Divide the gravel filter layer into several groups, and block the first drainage port side by side. Its function is to replace the filter layer by grouping when the gravel filter layer is blocked by more particles during the filtration process, so as not to affect the pool water. The purpose of replacing the filter layer in the case of filtration, the purpose of dividing the sand filter layer and activated carbon adsorption layer into several groups is the same as that of the gravel filter layer.

Compared with the prior art, the present invention has the following advantages:

1. In the present invention, the aeration diffusion device provided in the aeration tank makes the bubbles fully contact with the activated sludge floating in the sewage, increases the time for the bubbles to stay, and improves the effect and efficiency of sewage treatment.

2. In the present invention, the foam elimination device provided in the aeration tank can disperse the foam in the sewage through physical methods, avoiding the secondary pollution caused by the use of foam elimination agents and other chemicals to eliminate foam, and also saving foam Eliminator usage cost.

3. In the present invention, the emergent plants in the artificial wetland are planted on the floating platform, which is not affected by the water level in the wetland. By adjusting the number of floating tanks, the floating platform is at a water level where the emergent plants grow better.

4. In the present invention, the odor emitted from the constructed wetland is treated by the odor treatment box, reducing the pollution to the environment.

5. In the present invention, the gravel filter layer, sandstone filter layer and activated carbon adsorption layer are divided into several groups in the purification tank, which are convenient to take out when cleaning the filter layer and the adsorption layer, and have the advantage of convenient use.

Description of drawings

Fig. 1 is a schematic structural view of an aeration generating device, an aeration diffusion device, a foam elimination device and a sludge recovery device in an aeration tank of the present invention.

Fig. 2 is a schematic diagram of the axonometric structure of the foam eliminating device of the present invention.

Fig. 3 is a schematic diagram of the structure of the constructed wetland of the present invention.

Fig. 4 is a structural schematic diagram of the floating platform of the present invention.

Fig. 5 is a schematic structural view of the purification pool of the present invention.

FIG. 6 is a schematic diagram of a partially enlarged structure at point A in FIG. 5 .

In the figure, 31, stirring impeller; 32, third sewage discharge inlet; 33, third sewage discharge outlet; 34, propeller impeller; 34a, paddle; 34aa, air outlet; 34b, hub 34b; 34ba, air intake chamber 35. Air pipe; 36. Corner joint; 37. Air pump; 38. Impeller shaft; 39. Drainage hood; , water spray pipe; 44a, water spray hole; 45, water main pipe; 46, connecting rod; 47, floating ball; 48, sludge collection box; 49, sludge inlet nozzle; 50, water pump; 51, sludge Filter screen; 52, excavation wheel; 52a, wheel plate; 52aa, excavation teeth; 53, conservation pond; 54, fourth sewage discharge inlet; 55, fourth sewage discharge outlet; 56, emergent plants; 57, submerged plants ;58, floating platform; 59, nylon layer; 60, gravel layer; 61, soil layer; 62, net plate one 63, net plate two; 64, net plate three; 65, cage; 66, floating box; 67 , screen plate four; 68, air drainage hood; 68a, air vent; 69, air pump; 70, odor treatment box; 70a, box body; 70b, air filter layer; 70c, air filter sandwich net; Pool body; 72, second-level pool body; 73, third-level pool body; 74, fourth-level pool body; 75, fifth sewage discharge inlet; 76, fifth sewage discharge outlet; 77, first drainage port; 78, the first 2nd drainage port; 79, third drainage port; 80, gravel filter layer; 81, sand filter layer; 82, activated carbon adsorption layer; 83, gravel mesh; 84, sand mesh; 85, activated carbon mesh; 86 , guide bar.

Detailed ways

The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

A rural domestic sewage treatment system, characterized in that the treatment system includes an aeration tank that decomposes organic matter in the sewage, and includes an artificial wetland and a purification tank, as shown in Figures 1 and 2, the aeration tank includes a pool body, the pool body has a third sewage discharge inlet 32 and a third sewage discharge outlet 33, the third sewage discharge inlet 32 is connected to the liquid outlet solenoid valve through a pipeline, and the neutral liquid storage tank is connected to the third sewage discharge inlet 32 through a pipeline Connected, the tank body is provided with an aeration generating device, an aeration diffusion device, a foam elimination device and a sludge recovery device, and the aeration generating device includes a propeller impeller 34 arranged at the bottom of the pool, and the propeller impeller 34 includes a paddle 34a and a hub , the inside of the paddle 34a has an inner cavity, and the top surface of the paddle 34a is provided with some air outlet holes 34aa that communicate with the inner cavity of the paddle 34a. Fixed, there is an air intake chamber 34ba inside the hub, the air intake chamber 34ba communicates with the inner cavity of the blade 34a, the bottom of the hub has an air inlet connected to the air inlet chamber 34ba, and the bottom of the air inlet is provided with an air pipe 35, The top of the air pipe 35 is in the air inlet and fits with the air inlet. The bottom end of the air pipe 35 is connected to a corner joint 36. The corner joint 36 is connected to an air pump 37 through a pipeline. The air pipe 35 is provided with an impeller shaft 38 , the top of the impeller shaft 38 is fixed to the hub, and the bottom end of the impeller shaft 38 passes through the corner joint 36 and is connected with the output shaft of a motor;

The aeration diffusion device comprises a drainage cover 39, the drainage cover 39 is in the shape of an inverted funnel, the upper end of the drainage cover 39 is a closed end, and the upper end side wall of the drainage cover 39 is provided with several openings, and the number of the openings is two in the present embodiment. , distributed symmetrically about the axis of the drainage cover 39, the lower end of the drainage cover 39 is an open end, and the drainage cover 39 is arranged on the top of the propeller impeller 34, so that the propeller impeller 34 is in the opening of the lower end of the diversion cover 39, and the lower end of the diversion cover 39 is open Also be provided with in the filter bubble net 40 that is used for air bubble thinning, this filter bubble net 40 can be common barbed wire, is fixed on the inwall of drainage cover 39, and filter bubble net 40 is positioned at the top of paddle 34a, and the upper end of drainage cover 39 also A number of olive-shaped bubble retention chambers 41 are provided. In this embodiment, there are two bubble retention chambers 41, which are distributed symmetrically about the axis of the drainage cover 39. The bubble retention chambers 41 are horizontally arranged along the axis, and the bubble retention chambers The two sides of 41 have openings, and the opening of one side of the bubble retention chamber 41 is connected with the opening on the side wall of the upper end of the drainage cover 39; The bottom end is connected with a drainage sub-hood 43, and the top of the drainage tube 42 extends into the air bubble retention chamber 41;

The foam elimination device comprises some water spray pipes 44 which are horizontally arranged on the pool surface of the aeration tank. In the present embodiment, the interval of some water spray pipes 44 is 100mm. 44 is up and down undulating wave shape, and one end of water spray pipe 44 is a closed end, and the other end is an input end, and the bottom of water spray pipe 44 is provided with some water spray holes 44a toward the bottom of the pool, and the interval of some water spray holes 44a makes it Can be distributed to the convex portion and the concave part of the water spray pipe 44, some water spray holes 44a are evenly distributed along the length direction of the water spray pipe 44, the input ends of some water spray pipes 44 are communicated with a water delivery main pipe 45, and the water delivery The main pipe 45 is connected with a booster water pump; the closed ends of some water spray pipes 44 are fixedly connected with a connecting rod 46, so that some water spray pipes 44 are evenly distributed along the length direction of the connecting rod 46, and the water delivery main pipe 45 and the connecting rod 46 are along the Its length direction is provided with a number of floating balls 47, the number of floating balls 47 is set so that a part of the water spray pipe 44 is above the pool surface, and a part is below the pool surface;

The sludge recycling device includes a sludge collection box 48 arranged at the bottom of the aeration tank, and a number of sludge inlets are provided on the side of the sludge collection box 48. In this embodiment, the number of sludge inlets is twenty, and the sludge inlets A sludge inlet 49 is fixed, and the sludge inlet 49 is funnel-shaped, including an inlet and an outlet. The diameter of the inlet is greater than the diameter of the outlet. The inlet of the sludge inlet 49 is connected and fixed to the sludge inlet. The outlet end of inlet nozzle 49 stretches into the box body of sludge collection box 48, and the top of sludge collection box 48 is provided with water outlet, and water outlet is connected with a water pump 50 by pipeline, and in the sludge collection box 48, near water outlet A sludge filter screen 51 is arranged horizontally.

The aeration generating device also includes an excavating mechanism for loosening the sludge at the bottom of the aeration tank. The excavating mechanism includes a horizontally arranged excavating wheel 52. The excavating wheel 52 includes an annular wheel plate 52a, and the circumferential bottom of the wheel plate 52a Digging teeth 52aa are provided, and the digging teeth 52aa are in contact with the bottom of the aeration tank, and the excavating wheel 52 is connected with the part where the bottom end of the impeller rotating shaft 38 passes through the corner joint 36 .

As shown in Figure 3 and Figure 4, the constructed wetland includes a conservation pool 53, and the conservation pool 53 includes a pool body made of concrete, and the pool body includes a fourth sewage discharge inlet 54 and a fourth sewage discharge outlet 55, and the fourth sewage discharge inlet 54 communicates with the third sewage outlet 33 through pipelines, and the upper layer in the pool body is planted with emergent plants 56, and the lower layer in the pool body is planted with submerged plants 57, and the emergent plants 56 are planted on a floating platform 58, and the floating platform 58 Including a nylon layer 59, a sandstone layer 60 and a soil layer 61 stacked from bottom to top in turn, the nylon layer 59 includes a pair of mesh plates 62 arranged parallel to each other, and nylon threads are laminated between the mesh plates 62, and the sand The stone layer 60 includes a pair of mesh plates 2 63 arranged parallel to each other, sand and gravel are filled between the mesh plates 2 63, and the soil layer 61 includes a pair of mesh plates 3 64 arranged parallel to each other, and earth is filled between the mesh plates 3 64. , Emergent plants 56 are planted on the soil layer 61, the periphery of net plate one 62, net plate two 63 and net plate three 64 are fixed on a cage 65 and are stacked and fixed mutually by the cage 65, fixed on the cage 65 There are several floating boxes 66, and the quantity of the floating boxes 66 is determined according to the weight of the required floating weight; the bottom of the conservation pond 53 is filled with soil, and the soil is covered with a mesh plate 4 67, and the mesh plate 4 67 adopts Plastic net, submerged plants 57 are planted in the soil at the bottom of the conservation pond 53.

The top of the conservation pool 53 is provided with a hemispherical air drainage cover 68, the bottom of the air drainage cover 68 is an open end, and the top is a closed structure. Both sides of the bottom of 68 are provided with air vent 68a, and the top of air draft cover 68 is provided with exhaust hole, and exhaust hole is connected with a suction pump 69 by pipeline, and the other end of suction pump 69 is connected with an odor treatment by pipeline. Box 70 is connected, and odor treatment box 70 comprises box body 70a, and a side of box body 70a is provided with air inlet, and is connected with suction pump 69 by pipeline, and the other side of box body 70a offers air outlet, box body Several air filter layers 70b are arranged inside 70a. In this embodiment, there are three air filter layers 70b. The air filter layers 70b include air filter interlayers 70c, and activated carbon is sandwiched between the air filter interlayers 70c.

As shown in Figures 5 and 6, the purification pool includes a first-level pool body 71, a second-level pool body 72, a third-level pool body 73, and a fourth-level pool body 74 distributed step by step from top to bottom. 71 has a fifth sewage discharge inlet 75, the fourth-level pool body 74 has a fifth sewage discharge outlet 76, the first-level pool body 71 is provided with a first drainage port 77, and the pool water in the first-level pool body 71 is discharged through the first drainage port 77. To the secondary pool body 72, the secondary pool body 72 is provided with a second drainage port 78, and the pool water in the secondary pool body 72 is discharged to the tertiary pool body 73 through the second drainage port 78, and the tertiary pool body 73 is provided with a second drainage port 78. The third drainage port 79, the pool water in the third-level pool body 73 is discharged to the fourth-level pool body 74 through the third drainage port 79; the first drainage port 77 is provided with a gravel filter layer 80, and the second drainage port 78 is provided with gravel The filter layer 81 and the third drainage port 79 are provided with an activated carbon adsorption layer 82 .

The gravel filter layer 80 includes several groups of gravel meshes 83, and the gravel meshes 83 hold gravel. Several groups of gravel meshes 83 are juxtaposed against and block the first drainage port 77. The sand filter layer 81 includes several groups of sand The stone clamping net 84 and the sand and gravel clamping net 84 hold sand and gravel, and several groups of sand and gravel clamping nets 84 are juxtaposed against the second drainage port 78 to seal and cut off. Activated carbon is clamped, and several groups of activated carbon clamping nets 85 are juxtaposed against and sealed off the third drainage port 79 . In the present embodiment, the width of the gravel mesh 83, the gravel mesh 84 and the activated carbon mesh 85 is 500 mm, and its quantity is determined by the actual widths of the first drainage port 77, the second drainage port 78 and the third drainage port 79. Certainly. In this embodiment, several groups of gravel nets 83 are arranged side by side against the first drainage opening 77 by the following method, and guide strips 86 are arranged horizontally at the first drainage opening 77. The guide strips 86 are divided into two groups, two in each group, Guide grooves are formed between each group of guide strips 86, and the gravel mesh 83 is snapped into the guide grooves. Groups of gravel clamping nets 83 are formed side by side, which is convenient for maintenance and cleaning. When the gravel clamping nets 83 need to be cleaned, they can be taken out from the guide groove one by one, which is very convenient. The guide bar 86 can be made of common metal rods, and the two ends are respectively fixed on the pool body on both sides of the first drainage port 77 . Several groups of gravel meshes 84 and several groups of activated carbon meshes 85 abut against the second drainage port 78 and block the third drainage port 79 respectively. 83 The method used.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Although this paper uses more 31, stirring impeller; 32, third sewage discharge inlet; 33, third sewage discharge outlet; 34, propeller impeller; 34a, paddle; 34aa, air outlet; 34b, wheel hub 34b; 34ba , air intake cavity 35, air delivery pipe; 36, corner joint; 37, air pump; 38, impeller shaft; 39, drainage cover; 40, filter bubble net; 41, bubble retention chamber; 42, drainage tube; 43, drainage Sub-hood; 44, water spray pipe; 44a, water spray hole; 45, water main pipe; 46, connecting rod; 47, floating ball; 48, sludge collection box; 49, sludge inlet nozzle; 50, water pump; 51. Sludge filter screen; 52. Digging wheel; 52a, wheel plate; 52aa, digging tooth; 53. Conservation pond; 54. The fourth sewage discharge inlet; 55. The fourth sewage discharge outlet; 56. Emergent plants; 57 , submerged plants; 58, floating platform; 59, nylon layer; 60, gravel layer; 61, soil layer, soil layer; 62, net plate one; 63, net plate two; 64, net plate three; 65, cage; 66. Floating box; 67. Net plate four; 68. Air drainage cover; 68a. Air vent; 69. Air suction pump; 70. Odor treatment box; 70a. Box body; 70b. Air filter layer; 70c. Air filter clip net; 71, the first-level pool body; 72, the second-level pool body; 73, the third-level pool body; 74, the fourth-level pool body; 75, the fifth sewage discharge inlet; 76, the fifth sewage discharge outlet; 77, the first Drainage port; 78. Second drainage port; 79. Third drainage port; 80. Gravel filter layer; 81. Sand filter layer; 82. Activated carbon adsorption layer; 83. Gravel mesh; 84. Sand mesh; 85 , activated carbon mesh; 86, guide strips and other terms, but does not rule out the possibility of using other terms. These terms are used only for the purpose of describing and explaining the essence of the present invention more conveniently; interpreting them as any kind of additional limitation is against the spirit of the present invention.

Claims (8)

1. A rural domestic sewage treatment system, characterized in that, the treatment system includes an aeration tank that decomposes organic matter in the sewage, and includes an artificial wetland and a purification tank, and the aeration tank includes a pool body, the The pool body has a third sewage discharge inlet (32) and a third sewage discharge outlet (33), the third sewage discharge inlet (32) is connected to the liquid outlet solenoid valve through a pipeline, and the neutral liquid storage tank is connected through a pipe The road communicates with the third sewage discharge inlet (32), and the tank body is provided with an aeration generating device, an aeration diffusion device, a foam eliminating device and a sludge recovery device, and the aeration generating device includes a The propeller impeller (34) at the bottom of the pool, the propeller impeller (34) includes a paddle (34a) and a hub (34b), the inside of the paddle (34a) has an inner cavity, and the top of the paddle (34a) The surface is provided with some air outlet holes (34aa) communicating with the inner cavity of the paddle (34a), the paddle (34a) is fixed to the hub (34b), and the hub (34b) has an air inlet cavity (34ba) inside, The air intake chamber (34ba) communicates with the inner cavity of the blade (34a), the bottom of the hub (34b) has an air inlet connected to the air intake chamber (34ba), and the bottom of the air inlet is provided with an air delivery pipe (35), the top of the air delivery pipe (35) is in the air inlet and fits with the air inlet clearance, the bottom end of the air delivery pipe (35) is connected with a corner joint (36), and the corner joint (36) passes through The pipeline is connected with an air pump (37), the air delivery pipe (35) is provided with an impeller shaft (38), the top of the impeller shaft (38) is fixed to the hub (34b), and the bottom of the impeller shaft (38) End passes through described corner joint (36), and is connected with the output shaft of a motor; The aeration diffuser includes a drainage cover (39), the drainage cover (39) is in the shape of an inverted funnel, the upper end of the drainage cover (39) is a closed end, and the upper end side wall of the drainage cover (39) is opened There are several openings, the lower end of the drainage cover (39) is an open end, and the drainage cover (39) is arranged on the top of the propeller impeller (34), so that the propeller impeller (34) is in the position of the drainage cover (39) In the opening of the lower end, the opening of the lower end of the drainage cover (39) is also provided with a vesicle net (40) for refining the air bubbles, and the vesicle net (40)) is located in the paddle ( 34a), the upper end of the drainage cover (39) is also provided with some olive-shaped bubble retention chambers (41), the bubble retention chambers (41) are horizontally arranged along its axis, and the bubble retention chambers ( 41) has openings on both sides, and the opening on one side of the bubble retention chamber (41) communicates with the opening on the upper side wall of the drainage cover (39); A helical drainage tube (42), the bottom end of the drainage tube (42) is connected with a drainage sub-hood (43), and the top of the drainage tube (42) extends into the bubble retention chamber (41). 2. A kind of rural domestic sewage treatment system according to claim 1, characterized in that, said foam elimination device comprises some water spray pipes (44) arranged laterally on the surface of the aeration tank, said water spray pipes (44) is up and down undulating wave shape, and one end of described water spray pipe (44) is a closed end, and the other end is an input end, and the bottom of described water spray pipe (44) is provided with some water spray holes towards the bottom of the pool ( 44a), said several water spray holes (44a) are evenly distributed along the length direction of water spray pipes (44), and the input ends of said several water spray pipes (44) are communicated with a water delivery main pipe (45), and the water delivery main pipe (45) is connected with a booster water pump; The closed end of described some water spray pipes (44) is fixedly connected with a connecting rod (46), makes described several water spray pipes (44) along the length of connecting rod (46) The direction is evenly distributed, and the water main pipe (45) and the connecting rod (46) are provided with several floating balls (47) along the length direction thereof. 3. a kind of rural domestic sewage treatment system according to claim 2, is characterized in that, described sludge recycling device comprises the sludge collection box (48) that is arranged at the bottom of the aeration tank, the sludge collection box ( The side of 48) is provided with some sludge inlets, and described sludge inlet is fixed with sludge inlet nozzle (49), and described sludge inlet nozzle (49) is funnel-shaped, comprises inlet end and outlet end, and the mouth of inlet end The diameter is greater than the diameter of the outlet end, the inlet end of the sludge inlet (49) is connected and fixed with the sludge inlet, and the outlet end of the sludge inlet (49) extends into the sludge collection box (48 ) in the box, the top of the sludge collection box (48) is provided with a water outlet, and the water outlet is connected with a water pump (50) through a pipeline, and the horizontal direction near the water outlet in the sludge collection box (48) A sludge filter screen (51) is provided. 4. A rural domestic sewage treatment system according to claim 3, wherein the aeration generating device also includes an excavating mechanism for loosening the sludge at the bottom of the aeration tank, and the excavating mechanism includes An excavating wheel (52) arranged horizontally, the excavating wheel (52) includes an annular wheel plate (52a), and the circumferential bottom of the wheel plate (52a) is provided with excavating teeth (52aa), and the described excavating teeth ( 52aa) is in contact with the bottom of the aeration tank, and the excavating wheel (52) is connected with the part where the bottom end of the impeller shaft (38) passes through the corner joint (36). 5. A rural domestic sewage treatment system according to claim 3, characterized in that the constructed wetland comprises a conservation pool (53), and the conservation pool (53) comprises a pool body made of concrete, and the pool The body includes a fourth sewage discharge inlet (54) and a fourth sewage discharge outlet (55), the fourth sewage discharge inlet (54) communicates with the third sewage discharge outlet (33) through a pipeline, and the inside of the pool body Emergent plants (56) are planted in the upper layer, submerged plants (57) are planted in the lower layer of the pool body, and the emergent plants (56) are planted on a floating platform (58), and the floating platform (58 ) includes a nylon layer (59), a sandstone layer (60) and a soil layer (61) stacked from bottom to top in sequence, and the nylon layer (59) includes a pair of net plates one (62) arranged parallel to each other , Nylon threads are laminated between the net plates one (62), and the sand and gravel layer (60) includes a pair of net plates two (63) arranged parallel to each other, and between the net plates two (63) Filled with sand and gravel, the soil layer (61) includes a pair of net plates three (64) arranged parallel to each other, and soil is filled between the net plates three (64), and the emergent plants (56) Planted on the soil layer (61), the periphery of the net plate one (62), net plate two (63) and net plate three (64) is fixed on a cage (65) and passed through the cage ( 65) Stacking and fixing each other, several floating boxes (66) are fixed on the cage (65); the bottom of the conservation pond (53) is filled with soil, and the soil is covered with four mesh panels (67) , the submerged plants (57) are planted in the soil at the bottom of the conservation pond (53). 6. A rural domestic sewage treatment system according to claim 5, characterized in that, the top of the conservation pond (53) is provided with a hemispherical air-drainage cover (68), and the air-drainage cover (68 ) is an open end, and the top is a closed structure, and the bottom end of the air draft cover (68) covers the pool body of the conservation pool (53), and the bottom two sides of the air draft cover (68) are provided with Vent (68a), the top of the air draft cover (68) is provided with an exhaust hole, and the exhaust hole is connected with an air pump (69) through a pipeline, and the other end of the air suction pump (69) is connected through a pipeline. Connect with an odor treatment box (70), and described odor treatment box (70) comprises casing (70a), and one side of casing (70a) is provided with air inlet, and is connected with described by pipeline The air pump (69) is connected, and the other side of the box body (70a) is provided with an air outlet, and several air filter layers (70b) are arranged in the box body (70a), and the described air filter layer (70b) includes filter air Air clamping nets (70c), activated carbon is sandwiched between the air filter clamping nets (70c). 7. A rural domestic sewage treatment system according to claim 6, characterized in that the purification pool comprises a first-level pool body (71) and a second-level pool body (72) distributed step by step from top to bottom ), the third-level pool body (73) and the fourth-level pool body (74), the first-level pool body (71) has the fifth sewage discharge inlet (75), and the fourth-level pool body (74) has the fifth sewage Outlet (76), the primary pool body (71) is provided with a first drainage port (77), and the pool water in the primary pool body (71) is discharged to the first drainage port (77) A secondary pool body (72), the secondary pool body (72) is provided with a second drainage port (78), and the pool water in the secondary pool body (72) is discharged to the The third-level pool body (73) described above, the third-level pool body (73) is provided with a third drainage port (79), and the pool water in the third-level pool body (73) is discharged through the third drainage port (79) To the four-stage pool body (74); a gravel filter layer (80) is provided in the first drainage port (77), and a sand filter layer (81) is provided in the second drainage port (78) , the third drainage port (79) is provided with an activated carbon adsorption layer (82). 8. A rural domestic sewage treatment system according to claim 7, characterized in that, the gravel filter layer (80) includes several groups of gravel nets (83), and the gravel nets (83) are clamped Holding the gravel, the several groups of gravel meshes (83) are juxtaposed against and blocked the first drainage port (77), and the sand filter layer (81) includes several groups of sand meshes (84 ), the sand and gravel mesh (84) clamps sand and gravel, and the several groups of sand and gravel mesh (84) are juxtaposed against and block the second drainage port (78), and the activated carbon The adsorption layer (82) includes several groups of activated carbon clamps (85), and the activated carbon clamps (85) clamp activated carbon, and the several groups of activated carbon clamps (85) are juxtaposed against the third blocking block. Drain (79).