CN116425346B - Unpowered buried vertical flow wetland rural domestic sewage treatment device and method - Google Patents

Abstract

The invention discloses an unpowered buried type vertical flow wetland rural domestic sewage treatment device and method, comprising a main box body and a composite vertical flow wetland system, wherein the main box body consists of a sedimentation tank, an anaerobic tank and an anoxic tank which are sequentially communicated; the composite vertical flow wetland system consists of a subsystem A and a subsystem B, wherein the subsystems respectively comprise a subsystem tank body, a water inlet tank, a middle tank and a water level regulating tank are sequentially arranged in each subsystem tank body, and filler modules are respectively arranged in the water inlet tank and the middle tank; an alternate drainage system is arranged between the water level regulating tank of the subsystem A and the water level regulating tank of the subsystem B; the invention realizes the sedimentation treatment, anaerobic treatment and anoxic treatment of sewage in an integrated closed structure, can be buried underground for implementation during sewage treatment, reduces environmental pollution and floor space, and has the advantages of easy management and operation, no energy consumption, no power and stable effluent quality.

Description

Unpowered underground vertical flow wetland rural domestic sewage treatment device and method

Technical field

The invention relates to the technical field of sewage treatment, and in particular to a non-powered underground vertical flow wetland rural domestic sewage treatment device.

Background technique

At present, the amount of domestic sewage in rural areas is large and widespread, dispersed and difficult to collect. Its quantity, composition, and concentration of pollutants are related to residents' living habits, living standards, and water resource enjoyment. In the past decade or so, the increase in nitrogen and phosphorus content in rural domestic sewage has caused and aggravated the eutrophication of water bodies, and the water quality of receiving water bodies has seriously deteriorated. Due to the increasing water pollution, the condition of rural water environment is deteriorating day by day, which not only reduces crop yields, but also directly threatens the health of farmers.

At the same time, due to the weak economic foundation and lack of technical personnel in most rural areas, traditional sewage treatment technology and equipment require professional technical personnel to operate and consume a certain amount of energy costs. Traditional sewage treatment equipment and equipment in rural areas are easily abandoned and become decorations and cannot be used. Better function.

Existing underground integrated rural sewage treatment equipment requires many devices, usually requiring multi-stage pump lifting and return flow. It not only occupies a large area, is inconvenient to manage, and is prone to failure. Due to the structural influence, the ground is shallow and generally cannot meet the requirements of gravity water inflow. It is necessary to set up a water collection well for lifting. There is also little covering soil on the top of the pool, making it difficult to reuse it comprehensively. The top of the pool is affected by pipelines, equipment, inspection wells, etc., so it is impossible to build a constructed wetland directly above the pool.

At present, vertical flow wetland systems are generally used for sewage treatment. However, traditional vertical flow wetland systems are prone to clogging. The main reason is that the particle size of the filler matrix in the system is generally fine in the upper part and large in the lower part. Microbial secretions in the system, sediments on the surface of the filler, etc. are easily blocked. The smaller particle gaps in the upper part of the filler are blocked, making it difficult for the air in the top layer to enter the inside of the system, and the gases generated by the microbial biochemical reactions inside the system are also difficult to escape, thus affecting the sewage treatment efficiency of the entire wetland system. Over time, the entire system becomes hardened and needs to be cleaned as a whole, which consumes a lot of manpower, material resources and time, and affects the continuous operation of the system.

Compared with above-ground sewage treatment devices, traditional underground sewage treatment devices have the advantages of small footprint, good environmental benefits, reduction of NIMBY conflicts, and sharing of land resources. However, the construction and operation costs of underground sewage treatment systems are high, Problems such as difficult management have restricted the development of traditional underground sewage treatment devices.

In view of the above technical problems of rural domestic sewage treatment, it is necessary to develop a non-powered underground vertical flow wetland rural domestic sewage treatment device suitable for the current situation in rural areas.

Contents of the invention

In order to solve the problems existing in the existing technology, the purpose of the present invention is to provide a non-powered buried vertical flow wetland rural domestic sewage treatment device and method, which can effectively solve the treatment problems of domestic sewage in rural areas. During sewage treatment, it can be buried in Implemented underground, it reduces environmental pollution and floor space. At the same time, the device and method of the present invention have the advantages of easy management and operation, not easy to be blocked, no energy consumption, no power, and stable outlet water quality.

The present invention proposes the following technical solution: a non-powered underground vertical flow wetland rural domestic sewage treatment device, including a main box and a composite vertical flow wetland system. The main box is composed of a sedimentation tank, an anaerobic tank, and an anaerobic tank that are connected in sequence. Anoxic pool composition;

The main box is provided with partitions one and two to separate the main box into a sedimentation tank, an anaerobic tank, and an anoxic tank; the sedimentation tank and the anaerobic tank pass through the partitions. The opening one provided at the upper end is connected, the anaerobic tank and the anoxic tank are connected through the opening two provided at the bottom of the partition plate two, and pipes are provided at the opening one and the opening two;

Through the design that the anaerobic pool and the anoxic pool are connected through the opening two provided at the bottom of the partition plate two, the anaerobic pool and the anoxic pool use the bottom of the pool to pass water, and the oily suspension in the sewage entering the anaerobic pool The substances float on the water surface of the anaerobic tank and decompose through a longer residence time, and the fully decomposed mud water substances enter the anoxic tank from the lower end through holes of the anaerobic tank and anoxic tank through sedimentation, and the sewage in the anoxic tank is processed The mud and water are separated, and after decomposition, the solid pollutants sink to the bottom of the tank, and the liquid part flows out of the anoxic tank.

The anaerobic tank is provided with a number of packing racks, a number of baffles one and a number of baffles two. The baffle one is bent along the sewage flow direction near the bottom of the anaerobic tank and between the baffle and the bottom of the anaerobic tank. There is a gap. The second baffle plate is vertically installed on the bottom of the anaerobic tank and contacts the bottom of the anaerobic tank. The first baffle plate is set at a height higher than the opening one. The second baffle plate is set The height is lower than the opening one, the filler hanger is arranged between the baffle plate one and the baffle plate two, and a soft filler group is provided on the filler hanger;

The soft packing group is installed on the packing rack, which increases the adhesion area of microorganisms. Through the design of baffles one and two, the sewage fully contacts the soft packing on the soft packing group, preventing short flow. , the biofilm attached to the soft filler can treat sewage more effectively.

The composite vertical flow wetland system consists of two parallel subsystems A and B. Both the A and B subsystems include subsystem pools, and each of the subsystem pools is equipped with five tanks. A layer of packing matrix filter material layer. The upper four layers of the packing matrix filter material layer are modular in design. Several square stainless steel cages are used to load the four layers of filler. Each stainless steel cage is a filler module. The bottom of the filler module For the gravel layer.

Further, the two subsystem pools are each provided with an inlet pool, an intermediate pool and a water level adjustment pool in sequence, and the filler module is arranged in the middle part of the inlet pool and the intermediate pool;

There is a partition plate three between the inlet pool and the intermediate pool. The bottom of the partition plate three is flush with the bottom of the filling module. There is a partition plate four between the water level adjustment pool and the intermediate pool. The bottom end of the partition plate 4 is in contact with the bottom of the subsystem pool body, and there are several through holes in the lower part of the partition plate 4;

Aquatic plants are planted on the filler module between the third partition and the fourth partition. The aquatic plants are at least one of aquatic canna, Changpu, copper money grass, and foxtail algae.

Two alternating drainage systems are provided between the two water level adjustment pools;

An overflow outflow pipe is provided between the water level adjustment pool and the intermediate pool. The overflow outflow pipe is composed of a straight pipe and a bent pipe. The straight pipe of the overflow outflow pipe penetrates the partition plate 4 and is connected to the intermediate pool. , and is arranged above the filling module, an extended drainage pipe is provided at the lower end of the water outlet direction of the water level adjustment tank, and the extended drainage pipe runs through the water level adjustment tank;

The anoxic pool and the inlet pool are connected through a water distribution pipe, and the water distribution pipe is arranged above the filling module.

Further, the main box is an integrated structure, and an inspection well 1 and an inspection well 2 are provided on the top of the main box. The inspection well 1 is provided between the sedimentation tank and the anaerobic tank. The second inspection well is arranged between the anaerobic pool and the anoxic pool; the inspection well one and the second inspection well are arranged near the partition plate one and the partition plate two, and the inspection well one and the inspection well two are both provided with roofs. hole brickwork and manhole cover; the main box, top hole brickwork and manhole cover form a closed structure.

Through the structural design of inspection wells 1 and 2, the sewage treatment conditions in the sedimentation tank and anoxic tank can be easily checked.

Further, the alternate drainage system is composed of a water level detection structure and a drainage structure. The water level detection structure is arranged at the upper end of the water level adjustment pool, and the drainage structure is arranged at the lower end of the water level adjustment pool; the A subsystem The water level detection structure is connected to the drainage structure of the B subsystem, and the detection structure of the B subsystem is connected to the drainage structure of the A subsystem. A passage is provided between the water level adjustment pool of the A subsystem and the water level adjustment pool of the B subsystem. Pool pipe, the water level detection structure of the A subsystem and the drainage structure of the B subsystem are connected through two connecting cables. The connecting cables pass through the pool-through pipe. Both sides of the pool-through pipe are located on the connecting cables. A pulley is provided below the second; the water level detection structure includes a float and a float connecting rod. The float is connected to one end of the float connecting rod. A floating ball connecting rod rotating shaft is provided in the middle of the floating ball connecting rod. The float connecting rod The end far away from the float ball is connected to the connecting cable 2; the drainage structure includes a balance rod, a balance rod rotating shaft, a slip ring, a pulley 2, and an outlet pipe cover. The balance rod is connected to the float ball connecting rod through the connecting cable 2. A balance rod rotating shaft is arranged in the middle of the balance rod. One end of the balance rod away from the connecting cable 2 is connected to the connecting cable 1. The end of the connecting cable 1 away from the balance rod is connected to the outlet pipe cover. The outlet pipe cover is arranged directly above the extended drain pipe, and is connected to the outlet pipe cover. A slip ring is provided on one side of the balance bar connected to the connecting cable 1; a pulley 2 is provided between the upper end of the connecting cable 1 and the balance rod; and a pulley 3 is provided between the lower end of the connecting cable 1 and above the outlet pipe cover. .

Through the above design of the alternating drainage system, the alternate drainage of subsystem A and subsystem B can be achieved; when the water level adjustment pool is full, drainage can also be achieved through the overflow outflow pipe.

Alternate drainage mechanism of subsystem A and subsystem B: When the float of subsystem B floats up when the water in the water level adjustment tank is full, the floating ball connecting rod and the floating ball connecting rod rotating shaft drive the balance rod side connected by the two cables to pass the balance The rotating shaft of the rod moves upward, and the other side of the balance rod moves downward through the rotating shaft of the balance rod. The slip ring slides to the left toward the connecting cable 1. The outlet pipe cover is lifted up by the gravity of the connecting cable 1 and the slip ring. Subsystem A The water in the water level adjustment pool is discharged through the extended drainage pipe. When the water in the water level adjustment pool of subsystem A is drained, the outlet pipe cover of subsystem A loses the buoyancy of the water and is affected by the gravity of the outlet pipe cover itself. The outlet pipe cover moves downward and covers the extended drain pipe again. Subsystem A begins to accumulate water under the inflow of water from the water distribution pipe. When subsystem A is full of water, the water level detection structure in the water level adjustment pool of subsystem A and the drainage structure in the water level adjustment pool of subsystem B are triggered and lifted. The water level of subsystem B adjusts the outlet pipe cover in the pool, and subsystem B drains water; in the manner described above, subsystem A and subsystem B drain water alternately.

The composite vertical flow wetland system adopts two subsystems A and B that are fully drained alternately. After full drainage, air enters the system to aerate and increase oxygenation of the moist microbial film on the surface of the system filler matrix. Oxygen is performed alternately without power.

Further, the lengthened drainage pipe is composed of a curved pipe 1, a straight pipe 1, a curved pipe 2 and a straight pipe 2. The straight pipe 1 passes through one end of the water level adjustment pool, and the length of the straight pipe 2 is the length of the straight pipe 1. 3.5-4 times the length.

When the device of the present invention is draining, the water inflow from the water distribution pipe does not stop. The system lengthens the drainage pipe, increases the drainage pressure in a natural way, increases drainage, and empties the system through large drainage and small water inflow. Water enters the air in a way that keeps the system moist, thereby increasing the amount of oxygen dissolved in the water in the system.

Since the two subsystems A and B are respectively connected to the extended drainage pipes, the outlet pipe cover is touched only after the two subsystems A and B are full of water. The use of the extended drainage pipe increases the water level difference in the system and increases the drainage pressure, thus causing the water to drain during drainage. It drives the aging and peeling biofilm in the wetland system and the sediment settled at the bottom of the system to be discharged from the system to prevent blockage.

Further, there are several packing modules, and each packing module is composed of four layers of packing from top to bottom. The four packing layers are respectively a guar rice stone layer and a small round ceramsite layer from top to bottom. , zeolite layer, large round ceramsite layer.

Further, the specifications of the filler layer are as follows: guar rice layer 150mm thick, particle size 5-10mm; small round ceramsite layer 200mm thick, particle size 3-10mm; zeolite layer 300mm thick, particle size 10-20mm; The large round ceramsite layer is 200mm thick, with a particle size of 20-40mm; the gravel layer is 350mm thick, with a particle size of 30-50mm.

Because rural domestic sewage is large in volume and dispersed, its quantity, composition, and pollutant concentration are related to seasonal periods, local residents’ living habits, living standards, and water resources conditions. The pH value of the sewage produced varies with rural areas. Depending on the region and seasonal conditions, the filler modules designed in the composite vertical flow wetland system are divided into two types, namely the No. 1 filler module and the No. 2 filler module.

Further, the packing module is a No. 1 packing module, and the No. 1 packing module is a guar rice stone layer, an acidic small round ceramsite layer, a zeolite layer, and an acidic large round ceramsite layer.

Further, the packing module is a No. 2 packing module, and the No. 2 packing module is a guar rice stone layer, an alkaline small round ceramsite layer, a zeolite layer, and an alkaline large round ceramsite layer.

Further, when the pH value of the sewage is less than or equal to 8, the No. 1 packing module is installed. When the pH value of the sewage is greater than 8, the No. 2 packing module is installed.

Different metal ions will react with phosphorus under different pH conditions to produce different precipitation effects. Different packing modules are designed, and system devices are installed or replaced according to different rural areas and different seasonal periods by detecting the pH properties of sewage. The packing module improves the effect of the device reacting with phosphorus to form precipitation under different pH sewage conditions, so that the required effect can be achieved with smaller device size, smaller land area and construction cost.

Further, it also includes a grid pool, the grid pool and the sedimentation tank are connected through pipelines, a grid plate is provided in the grid pool, and grilles are evenly arranged on the grid plate, and the The top of the grid pool is provided with a roof plate, which completely covers the grid pool. The water inlet of the grid pool is provided with a sewage intercepting pipe, and a water outlet collection tank is provided below the overflow outflow pipe and the extended drainage pipe.

Furthermore, the main box and the subsystem pool are integrally formed and made of fiberglass materials, which can better prevent the seepage of sewage and contamination of groundwater;

The bottom of the grid pool is provided with a concrete cushion layer one, the bottom of the main box and the composite vertical flow wetland system is provided with a concrete cushion layer two, and the side of the water level adjustment tank connected to the extended drainage pipe is provided with a concrete cushion layer In layer three, the bottom of the grid pool is set higher than the bottom of the main box and subsystem pool.

The first and second concrete cushion layers, the bottom of the main box and the bottom of the subsystem pool are filled with medium-coarse sand, and the side of the main box opposite to the subsystem pool body and the third concrete cushion layer are filled with the subsystem pool body. The gaps on the opposite sides are filled with plain soil.

Through the design of concrete cushion layer one, concrete cushion layer two and concrete cushion layer three, the device can be buried in the ground more stably and firmly.

Furthermore, lawns are planted on the soil surface above the main box.

Furthermore, the unpowered underground vertical flow wetland rural domestic sewage treatment device also includes a sewage collection device, which includes a sewage collection pipe and a sewage collection well connected to the farmer's household, and the sewage collection device is connected to the sewage collection well. The sewage interception pipe installed at the water inlet of the grid tank is connected. The collected sewage from farmers includes black water and gray water from farmers. Black water refers to the water effluent from farmers' septic tanks, and gray water refers to sewage discharged from farmers' daily life.

This invention is divided into multiple small areas according to local conditions in rural areas. The terrain is used to lay out sewage collection pipes and sewage collection wells along the direction of sewage flow from high to low. There is no need to set up water pumps, no need to consume electricity, save energy, and is suitable for rural areas. area.

The invention also discloses an underground vertical flow wetland rural domestic sewage treatment method, which uses the above-mentioned unpowered underground vertical flow wetland rural domestic sewage treatment device to treat the rural domestic sewage. The steps include:

S1. Rural domestic sewage is discharged to the third-level septic tank, and the principles of sedimentation and anaerobic fermentation are used to remove suspended organic matter from domestic sewage;

S2. Sewage collection device collects sewage: collects domestic sewage and/or gray water from the septic tank overflow in each household and enters the grid tank for treatment;

S3. Sedimentation tank sedimentation: The sewage collected in step S2 is settled in a sedimentation tank and left to stand. The sedimentation tank is a vertical sedimentation tank with a hydraulic retention time of 2 hours to remove the remaining suspended organic matter in the domestic sewage;

S4. Anaerobic tank treatment: The treated sewage in step S3 flows into the anaerobic tank. Anaerobic biofilms are used to remove the colloidal and dissolved organic pollutants in the sewage. The filler is suspended through the hanger set in the anaerobic tank. Soft fillers or semi-soft fillers provide a solid surface for anaerobic microorganisms to attach and grow, allowing them to form biofilms on the filler surface;

S5. Anoxic pool treatment: The sewage after anaerobic treatment in step S4 is passed into the anoxic pool for anoxic treatment;

S6. Composite vertical flow wetland system treatment: The sewage treated in the anoxic tank flows out through the water distribution pipe into the inlet pool of the composite vertical flow wetland system. The sewage penetrates into the wetland through the processing of the filler module and gravel layer in the composite vertical flow wetland system. The water discharged from the bottom layer and treated and discharged from the composite vertical flow wetland system reaches the first-level standard in Guangdong Province's "Rural Domestic Sewage Treatment Discharge Standard" (DB44/2208-2019);

S7. Utilization of tail water resources: The tail water purified in step S6 is discharged to the effluent collection tank through the extended drainage pipe. The excess purified tail water flows out to the effluent collection tank through the overflow water pipe. The water collected in the effluent collection tank Can be used for agricultural irrigation water.

Mechanism of the composite vertical flow wetland system: The third partition installed in the pool body of the subsystem does not touch the bottom of the pool. The lower part of the partition three is connected, and a gravel layer is reserved. There is a through hole in the lower part of the partition four to introduce the water in the filling area. Water level adjustment pool. The water from the water distribution pipe passes through the packing module in front of partition three, flows vertically downward, enters the lowest gravel layer, then flows vertically upward, flows through the packing module between partition three and partition four, and then flows out through the overflow outflow pipe. The process of vertical downward flow and vertical upward flow of water through the packing module is called composite vertical flow.

The invention has the following beneficial effects:

1. The present invention realizes the sedimentation treatment, anaerobic treatment and anoxic treatment of sewage in an integrated closed structure. The sewage treatment can be buried underground to reduce environmental pollution and floor space. The sewage treatment is in a closed state. , which can degrade the waste gas produced by microorganisms in the water and reduce the generation of odor. At the same time, the invention adopts an integrated no-power and low-management design, which ensures the processing effect while also following the advantages of low investment and operating costs, and easy operation and maintenance.

2. The composite vertical flow wetland system designed by the present invention integrates the three functions of physics, chemistry and biology to treat sewage through the design of the inlet pool, the filler module of the intermediate pool and the design of the aquatic plant area on the filler module of the intermediate pool. The different functions of plants and fillers carry out biological nitrogen and phosphorus removal, and simultaneously remove CODCr, BOD, SS and other pollutants. After the composite vertical flow wetland system matures, biofilm will form on the filler surface and plant roots due to the growth of a large number of microorganisms. When sewage flows through the biofilm, a large amount of SS is blocked and intercepted by the filler and plant roots. The organic pollutants are removed through the absorption, assimilation and dissimilation of the biofilm. Finally, the composite vertical flow wetland system is realized by replacing the filler module or harvesting and planting plants. Final removal of contaminants.

3. The present invention designs the composite vertical flow wetland system as a five-layer filter material layer, comprehensively utilizing the capabilities of microbial degradation, plant absorption, and filter material matrix adsorption to remove pollutants in sewage; and because the upper four layers adopt a modular filler design, It is convenient for regular cleaning and replacement. The packing module design uses multiple stainless steel cages of the same size to load multi-layer packing, which can achieve uniform size production, facilitate mass production, convenient transportation, and quick installation. When one of the packing modules is damaged or blocked, , only need to replace damaged or clogged packing modules, reducing maintenance costs. At the same time, the use of module replacement can simplify the scale of operations, streamline personnel, and shorten cleaning time, thereby shortening the downtime of the device system and improving the efficiency of the device system; the bottom layer is a large-grained gravel layer, which is thicker , and the pores between gravels are large and not easy to block.

4. The present invention solves the two main problems of low processing efficiency and easy clogging in the wetland system through the design of the alternating drainage system and the lengthened drainage pipe. Through the design of the alternating drainage system, the oxygenation inside the two subsystems A and B is carried out alternately without power; through the design of the lengthened drainage pipe, the water level difference in the system is increased and the drainage pressure is increased, thus driving the wetland system during drainage. The aging and peeling biofilm and sediment deposited at the bottom of the system are discharged from the system to prevent clogging.

5. The device of the present invention is designed with through-holes in the packing module and the partition board of the water level adjustment tank. When draining water through the lower part of the packing, blockages and gases that are likely to cause blockage are taken away from the lower part, and air is more effectively introduced to increase the efficiency of the system. Oxygen to prevent system clogging and hardening.

6. The sewage treatment system of the present invention consists of a sedimentation tank, anaerobic tank, anoxic tank and a composite vertical flow wetland system connected in series, and has strong impact load resistance. Domestic sewage enters the sedimentation tank, anaerobic tank, and anoxic tank, intercepting most of the organic matter, and is decomposed into small molecular organic matter under the action of anaerobic hydrolysis. The small molecular organic pollutants are filtered, adsorbed, and Plant absorption and biodegradation can be removed. The process is simple, has no power loss, is easy to maintain and manage, generates basically no operating expenses, and has stable effluent quality.

Description of the drawings

Figure 1 is a schematic diagram of the three-dimensional structure of the present invention;

Figure 2 is a front cross-sectional view of the present invention;

Figure 3 is a schematic diagram of the internal structure of the anaerobic tank of the present invention;

Figure 4 is a schematic structural diagram of one of the alternating drainage systems between subsystem A and subsystem B;

Figure 5 is a top view of the present invention;

Figure 6 is a process flow diagram of the present invention;

Among them, 1-grid pool, 11-concrete cushion one, 12-concrete cushion two, 13-concrete cushion three, 14-roof, 2-sedimentation tank, 21-inspection well one, 22-inspection well two, 23-top hole bricklaying, 24-manhole cover, 3-anaerobic tank, 31-partition plate one, 32-partition plate two, 33-filler hanger, 34-baffle plate one, 35-baffle plate two, 36 -Soft packing group, 4-anoxic pool, 5-subsystem pool, 51-inlet pool, 52, intermediate pool, 53-water level adjustment pool, 54-partition three, 55-gravel layer, 56-partition plate 4. 57-overflow outlet pipe, 58-filling module, 6-water distribution pipe, 7-extended drainage pipe, 71-straight pipe one, 72-straight pipe two, 8-water collection tank, 101-float, 102-float Ball connecting rod, 103-floating ball connecting rod shaft, 104-pulley one, 105-pulley two, 106-connecting cable two, 107-connecting cable one, 108-slip ring, 109-balance rod, 110-balance rod rotating shaft, 111-water outlet pipe cover, 112-pool pipe, 113-pulley three.

Detailed ways

The present invention will be further described below through the drawings and examples, but they are not used as a basis for limiting the present invention.

Refer to Figure 1-Figure 5,

Example

The invention provides a non-powered underground vertical flow wetland rural domestic sewage treatment device, which includes a main box and a composite vertical flow wetland system. The main box consists of a sedimentation tank 2, an anaerobic tank 3, and an anoxic tank 4 that are connected in sequence. composition;

The main box is provided with a partition 31 and a partition 32 to divide the main box into a sedimentation tank 2, an anaerobic tank 3, and an anoxic tank 4; the sedimentation tank 2 and anaerobic tank 3 pass through the upper end of the partition 31 The opening one is connected to each other, and the anaerobic tank 3 and the anoxic tank 4 are connected to each other through the opening two provided at the bottom of the second partition 32. Pipes are provided at the opening one and the opening two;

Through the design that the anaerobic pool 3 and the anoxic pool 4 are connected through the opening two provided at the bottom of the partition 32, the anaerobic pool 3 and the anoxic pool 4 use the bottom of the pool to pass water, and the sewage entering the anaerobic pool 3 The oily suspended matter floats on the water surface of the anaerobic pool 3 and is decomposed through a longer residence time. The fully decomposed muddy water enters the anoxic pool 4 from the lower end through holes of the anaerobic pool 3 and the anoxic pool 4 through sedimentation. The sewage in the anoxic tank 4 is separated from mud and water. After decomposition, the solid pollutants sink to the bottom of the tank, and the liquid part flows out of the anoxic tank.

The anaerobic tank 3 is provided with a number of packing racks 33 and a number of baffles 1 34 and 2 35. The baffle 34 is bent near the bottom of the anaerobic tank 3 along the direction of sewage flow, and is connected to the anaerobic tank. There is a gap between the bottoms of the anaerobic tank 3. The baffle plate 35 is vertically installed on the bottom of the anaerobic tank 3 and is in contact with the bottom of the anaerobic tank 3. The baffle plate 34 is set at a height higher than the opening one. The baffle plate 35 is set vertically on the bottom of the anaerobic tank 3. The set height is lower than opening one, the filler hanger 33 is set between the baffle one 34 and the baffle two 35, and the filler hanger 33 is provided with a soft filler group 36;

The soft packing group 36 is installed on the packing hanger 33, which increases the adhesion area of microorganisms. Through the design of the baffles 34 and 35, the sewage is fully in contact with the soft packing on the soft packing group, preventing The phenomenon of short flow is eliminated, and the biofilm attached to the soft filler can treat sewage more effectively.

The composite vertical flow wetland system consists of two parallel subsystems A and B. Both the A and B subsystems include a subsystem pool 5. Each subsystem pool 5 is equipped with five layers of filler matrix filters. The material layer, the four layers above the packing matrix filter layer are modular in design, and several square stainless steel cages are used to load the four layers of filler. Each stainless steel cage is a filler module 58, and the bottom of the filler module 58 is a gravel layer 55.

Further, the two subsystem pools 5 are equipped with an inlet pool 51, an intermediate pool 52 and a water level adjustment pool 53 in sequence, and the filling module 58 is arranged in the middle part of the inlet pool 51 and the intermediate pool 52;

There is a partition three 54 between the inlet pool 51 and the intermediate pool 52. The bottom of the partition three 54 is flush with the bottom of the filling module 58. A partition four 56 is arranged between the water level adjustment tank 53 and the intermediate pool 52. The partition four 56 The bottom end is in contact with the bottom of the subsystem pool body 5, and there are several through holes in the lower part of the partition plate 456;

The filler module 58 between the third partition 54 and the fourth partition 56 is planted with aquatic plants, and the aquatic plants are at least one of aquatic canna, Changpu, copper money grass, and foxtail algae.

Two alternating drainage systems are provided between the two water level adjustment pools 53;

An overflow outflow pipe 57 is provided between the water level adjustment pool 53 and the intermediate pool 52. The overflow outflow pipe 57 is composed of a straight pipe and a bent pipe. The straight pipe of the overflow outflow pipe 57 passes through the partition 456 to communicate with the intermediate pool 52, and is arranged at Above the filler module 58, an extended drainage pipe 7 is provided at the lower end of the water level adjustment tank 53 in the water outlet direction, and the extended drainage pipe 7 penetrates the water level adjustment tank 53;

The anoxic tank 3 and the inlet tank 51 are connected through a water distribution pipe 6 , and the water distribution pipe 6 is arranged above the filling module 58 .

Further, the main box has an integrated structure, and an inspection well 21 and a second inspection well 22 are provided on the top of the main box. The first inspection well 21 is provided between the sedimentation tank 2 and the anaerobic tank 3, and the second inspection well 22 is provided between the sedimentation tank 2 and the anaerobic tank 3. Between the anaerobic tank 3 and the anoxic tank 4; inspection well one 21 and inspection well two 22 are arranged near the partition one 31 and the partition two 32, and the inspection well one 21 and the inspection well two 22 are both provided with top hole masonry Bricks 23 and manhole cover 24; the main box, top hole bricks 23 and manhole cover 24 form a closed structure.

Further, the alternating drainage system consists of a water level detection structure and a drainage structure. The water level detection structure is arranged at the upper end of the water level adjustment pool 53, and the drainage structure is arranged at the lower end of the water level adjustment pool 53; the water level detection structure of the A subsystem is the same as that of the B subsystem. The drainage structure is connected. The detection structure of the B subsystem is connected to the drainage structure of the A subsystem. A pool pipe 112 is provided between the water level adjustment pool 53 of the A subsystem and the water level adjustment pool 53 of the B subsystem. The water level of the A subsystem The detection structure is connected to the drainage structure of the B subsystem through the connecting cable 106. The connecting cable 106 passes through the pool pipe 112. The pool pipe 112 is provided with pulleys 104 on both sides below the connecting cable 106; the water level detection structure includes Float 101, float connecting rod 102, the float is connected to one end of the float connecting rod 102, a float connecting rod rotating shaft 103 is provided in the middle of the floating ball connecting rod 102, and the end of the floating ball connecting rod 102 away from the float 101 is connected to the floating ball connecting rod 102. Cable 2 106; the drainage structure includes a balance rod 109, a balance rod rotating shaft 110, a slip ring 108, a pulley 105, and an outlet pipe cover 111. The balance rod 109 is connected to the float connecting rod 102 through the cable 2 106, and a balance rod 109 is provided in the middle. The balance rod rotating shaft 110, the end of the balance rod 109 away from the connecting cable 106 is connected to the connecting cable 107, the end of the connecting cable 107 away from the balancing rod 109 is connected to the outlet pipe cover 111, the outlet pipe cover 111 is arranged directly above the extended drain pipe 7 , a slip ring 108 is provided on one side of the balance bar 109 connected to the connecting cable 107; a pulley 105 is provided between the upper end of the connecting cable 107 and the balance rod 109, and the lower end of the connecting cable 107 is connected to the outlet pipe cover Pulley three 113 is provided above 111.

Further, the lengthened drainage pipe 7 is composed of a curved pipe 1, a straight pipe 71, a curved pipe 2 and a straight pipe 72. The straight pipe 1 runs through one end of the water level adjustment pool, and the length of the straight pipe 72 is the length of the straight pipe 71. 3.5-4 times.

Further, there are several packing modules 58. Each packing module 58 is composed of four layers of packing from top to bottom. The four layers of packing from top to bottom are respectively a guar rice stone layer, a small round ceramsite layer, a zeolite layer, and a zeolite layer. Large round ceramic layer;

Further, the specifications of the filler layer are as follows: guar rice layer 150mm thick, particle size 5mm; small round ceramsite layer 200mm thick, particle size 3mm; zeolite layer 300mm thick, particle size 10mm; large round ceramsite layer 200mm thick, particle size The diameter is 20mm; the gravel layer is 350mm thick and the particle size is 30mm.

Further, the pH value of the sewage is 6.8-7, and the packing module 58 is the No. 1 packing module. The No. 1 packing module is a guar rice stone layer, an acidic small round ceramsite layer, a zeolite layer, and an acidic large round ceramsite layer.

Furthermore, the main box body and the subsystem pool body 5 are integrally formed and made of fiberglass materials, which can better prevent the seepage of sewage and the contamination of groundwater.

Embodiment 2 has the same structure as Embodiment 1 above, except that

The specifications of the filler layer are as follows: the guar rice layer is 150mm thick and the particle size is 10mm; the small round ceramsite layer is 200mm thick and the particle size is 10mm; the zeolite layer is 300mm thick and the particle size is 20mm; the large round ceramsite layer is 200mm thick and the particle size is 40mm; The gravel layer is 350mm thick and the particle size is 50mm.

The unpowered underground vertical flow wetland rural domestic sewage treatment device also includes a grid pool 1. The grid pool 1 and the sedimentation tank 2 are connected through pipelines. The grid pool 1 is equipped with a grid plate, and the grid plate is installed in the grid pool 1. The grid is evenly arranged, and the top of the grid pool 1 is provided with a roof 14 to completely cover the grid pool 1. The water inlet of the grid pool 1 is provided with a sewage intercepting pipe, an overflow outflow pipe 57 and an extended drainage pipe 7. A water outflow collection tank 8 is provided below.

The bottom of the grid pool 1 is provided with a concrete cushion layer 11, the bottom of the main box and the composite vertical flow wetland system is provided with a concrete cushion layer 2 12, and the side of the water level adjustment tank 53 connected to the extended drainage pipe 7 is provided with a concrete cushion layer 3. 13. The bottom of the grid pool 1 is set higher than the bottom of the main box and the subsystem pool 5.

Concrete cushion layer one 11, concrete cushion layer two 12 and the bottom of the main box and the bottom of the subsystem pool 5 are filled with medium coarse sand. The side of the main box opposite to the subsystem pool body 5 and the concrete cushion layer three 13 are filled with The gaps between the opposite sides of the system pool body 5 are filled with plain soil.

Through the design of the concrete cushion layer 11, the concrete cushion layer 2 12 and the concrete cushion layer 3 13, the device can be buried in the ground more stably and firmly.

Furthermore, lawns are planted on the soil surface above the main box.

Furthermore, the unpowered underground vertical flow wetland rural domestic sewage treatment device also includes a sewage collection device. The sewage collection device includes a sewage collection pipe connected to the farmer, a sewage collection well, and the sewage collection device is installed at the water inlet of the grid pool. The sewage interception pipe is connected, and the collected sewage from farmers includes black water and gray water from farmers. Black water refers to the water effluent from farmers’ septic tanks, and gray water refers to sewage discharged from farmers’ daily life.

Embodiment 3 is different from Embodiment 2 in that the pH value of the sewage is 8.7-9, the filler module 58 is the No. 2 filler module, and the No. 2 filler module is a guar rice stone layer, an alkaline small round ceramsite layer, a zeolite layer, and an alkali layer. Large round ceramic layer.

Embodiment 4. Referring to Figure 6, the unpowered underground vertical flow wetland rural domestic sewage treatment device of Embodiment 2 above is used for sewage treatment. The specific steps include:

The invention also discloses a non-powered buried vertical flow wetland rural domestic sewage treatment method, which is treated by the above-mentioned non-powered underground vertical flow wetland rural domestic sewage treatment device. The steps include:

S1. Rural domestic sewage is discharged to the third-level septic tank, and the principles of sedimentation and anaerobic fermentation are used to remove suspended organic matter from domestic sewage;

S2. The sewage collection device collects sewage: collects the domestic sewage and/or gray water overflowing from the septic tanks of each household and enters the grid tank 1 for treatment;

S3. Sedimentation tank sedimentation: Use the sedimentation tank 2 to settle the sewage collected in step S2 and let it stand. The sedimentation tank 2 uses a vertical sedimentation tank with a hydraulic retention time of 2 hours to remove the remaining suspended organic matter in the domestic sewage;

S4. Anaerobic pool treatment: The treated sewage in step S3 flows into the anaerobic pool 3. An anaerobic biofilm is used to remove the colloidal and dissolved organic pollutants in the sewage. It is suspended through the hanger set in the anaerobic pool 3. The filler uses soft filler or semi-soft filler to provide a solid surface for anaerobic microorganisms to attach and grow, allowing them to form biofilms on the filler surface;

S5. Anoxic pool treatment: The sewage after anaerobic treatment in step S4 is passed into the anoxic pool 4 for anoxic treatment;

S6. Composite vertical flow wetland system treatment: The sewage treated by the anoxic tank 4 flows out through the water distribution pipe 6 into the inlet pool 51 of the composite vertical flow wetland system. The sewage passes through the filler module 58 and the gravel layer 55 in the composite vertical flow wetland system. Treatment, the water penetrates into the bottom layer of the wetland, and the water discharged from the compound vertical flow wetland system reaches the first-level standard in Guangdong Province's "Rural Domestic Wastewater Treatment Discharge Standard" DB44/2208-2019;

S7. Utilization of tail water resources: The tail water treated and purified in step S6 is discharged to the effluent collection tank 8 through the extended drainage pipe 7. The excess purified tail water flows out to the effluent collection tank 8 through the overflow water pipe 57, and the effluent is collected. The water collected in Pool 8 can be used for agricultural irrigation.

After the above method, the water output index reaches the following level:

(1) Transparency>25cm;

(2) Dissolved oxygen>2mg/L;

(3) Oxidation-reduction potential >50mV;

(4) Ammonia nitrogen <2mg/L;

(5) BOD: <10mg/L;

(6) COD: <40mg/L;

(7) Total phosphorus: <0.4mg/L;

(8) Permanganate index: <15mg/L.

The above are only preferred examples of the present invention, and do not impose any formal or substantive restrictions on the present invention. All technical solutions falling under the ideas of the present invention belong to the protection scope of the present invention. Any equivalent changes and modifications made to the examples should also be considered as the protection scope of the present invention.

Claims (7)

1. The unpowered buried type vertical flow wetland rural domestic sewage treatment device is characterized by comprising a main box body and a composite vertical flow wetland system, wherein the main box body consists of a sedimentation tank (2), an anaerobic tank (3) and an anoxic tank (4) which are communicated in sequence;

a first baffle (31) and a second baffle (32) are arranged in the main box body to divide the main box body into a sedimentation tank (2), an anaerobic tank (3) and an anoxic tank (4); the sedimentation tank (2) is communicated with the anaerobic tank (3) through an opening I arranged at the upper end of the first partition plate (31), the anaerobic tank (3) is communicated with the anoxic tank (4) through an opening II arranged at the bottom of the second partition plate (32), and pipelines are arranged at the opening I and the opening II;

a plurality of filler hangers (33), a plurality of first baffle plates (34) and a plurality of second baffle plates (35) are arranged in the anaerobic tank (3), the first baffle plates (34) are bent near the bottom of the anaerobic tank (3) along the sewage flowing direction, a gap is reserved between the first baffle plates and the bottom of the anaerobic tank (3), the second baffle plates (35) are vertically arranged on the bottom of the anaerobic tank (3) and are in contact with the bottom of the anaerobic tank (3), the first baffle plates (34) are higher than the first opening, the second baffle plates (35) are lower than the first opening, the filler hangers (33) are arranged between the first baffle plates (34) and the second baffle plates (35), and soft filler groups (36) are arranged on the filler hangers (33);

the composite vertical flow wetland system consists of two parallel-connected A subsystems and B subsystems, wherein each A subsystem and each B subsystem comprise a subsystem tank body (5), five layers of filler matrix filter layers are arranged in each subsystem tank body (5), four layers of filler matrix filter layers are in modularized design, four layers of fillers are loaded by adopting a plurality of square stainless steel net boxes, each stainless steel net box is a filler module (58), and the bottom of each filler module (58) is a gravel layer (55);

a water inlet tank (51), a middle tank (52) and a water level regulating tank (53) are sequentially arranged in the two subsystem tank bodies (5), and a filler module (58) is arranged in the middle parts of the water inlet tank (51) and the middle tank (52);

a third partition plate (54) is arranged between the water inlet tank (51) and the middle tank (52), the bottom of the third partition plate (54) is flush with the bottom of the filler module (58), a fourth partition plate (56) is arranged between the water level regulating tank (53) and the middle tank (52), the bottom end of the fourth partition plate (56) is in contact with the bottom of the subsystem tank body (5), and a plurality of through holes are formed in the lower portion of the fourth partition plate (56);

aquatic plants are planted on the filler module (58) between the third partition plate (54) and the fourth partition plate (56);

two alternate drainage systems are arranged between the two water level regulating tanks (53);

an overflow water outlet pipe (57) is arranged between the water level regulating tank (53) and the middle tank (52), the overflow water outlet pipe (57) is composed of a straight pipe and a bent pipe, the straight pipe of the overflow water outlet pipe (57) penetrates through the partition plate IV (56) to be communicated with the middle tank (52) and is arranged above a filler module (58), an lengthened water outlet pipe (7) is arranged at the lower end of the water level regulating tank (53) in the water outlet direction, and the lengthened water outlet pipe (7) penetrates through the water level regulating tank (53);

the anoxic tank (3) is communicated with the water inlet tank (51) through a water distribution pipe (6), and the water distribution pipe (6) is arranged above the filler module (58);

the alternate drainage system consists of a water level detection structure and a drainage structure, wherein the water level detection structure is arranged at the upper end of the water level regulating tank (53), and the drainage structure is arranged at the lower end of the water level regulating tank (53); a pool through pipe (112) is arranged between the water level regulating tank (53) of the A subsystem and the water level regulating tank (53) of the B subsystem, a water level detection structure of the A subsystem is connected with a drainage structure of the B subsystem through a second connecting rope (106), the second connecting rope (106) passes through the pool through pipe (112), and pulleys I (104) are arranged below the second connecting rope (106) on two sides of the pool through pipe (112); the water level detection structure comprises a floating ball (101) and a floating ball connecting rod (102), wherein the floating ball is connected with one end of the floating ball connecting rod (102), a floating ball connecting rod rotating shaft (103) is arranged in the middle of the floating ball connecting rod (102), and one end, far away from the floating ball (101), of the floating ball connecting rod (102) is connected with a second connecting rope (106); the drainage structure comprises a balance rod (109), a balance rod rotating shaft (110), a slip ring (108), a pulley II (105) and a water outlet pipe cover (111), wherein the balance rod (109) is connected with the floating ball connecting rod (102) through a connecting rope II (106), the balance rod rotating shaft (110) is arranged in the middle of the balance rod (109), one end, far away from the connecting rope II (106), of the balance rod (109) is connected with the connecting rope I (107), one end, far away from the balance rod (109), of the connecting rope I (107) is connected with the water outlet pipe cover (111), the water outlet pipe cover (111) is arranged right above the lengthened drain pipe (7), and one side, connected with the connecting rope I (107), of the balance rod (109) is provided with the slip ring (108); a pulley II (105) is arranged between the upper end of the first connecting rope (107) and the balance rod (109), and a pulley III (113) is arranged above the lower end of the first connecting rope (107) and the water outlet pipe cover (111).

2. The unpowered buried vertical flow wetland rural domestic sewage treatment device according to claim 1, wherein: the main box body is of an integrated structure, a first inspection well (21) and a second inspection well (22) are arranged at the top of the main box body, the first inspection well (21) is arranged between the sedimentation tank (2) and the anaerobic tank (3), and the second inspection well (22) is arranged between the anaerobic tank (3) and the anoxic tank (4); a top hole brickwork (23) and a well cover (24) are arranged on the first inspection well (21) and the second inspection well (22); the main box body, the top hole brickwork (23) and the well cover (24) form a closed structure.

3. The unpowered buried vertical flow wetland rural domestic sewage treatment device according to claim 1, wherein: the filler modules (58) are in a plurality, each filler module (58) is composed of four layers of fillers from top to bottom, and the four layers of fillers are respectively a melon rice layer, a small round ceramsite layer, a zeolite layer and a large round ceramsite layer from top to bottom.

4. The unpowered buried vertical flow wetland rural domestic sewage treatment device according to claim 3, wherein: the filler module (58) is a first filler module, and the first filler module is a melon rice layer, an acidic small round ceramsite layer, a zeolite layer and an acidic large round ceramsite layer.

5. The unpowered buried vertical flow wetland rural domestic sewage treatment device according to claim 3, wherein: the filler module (58) is a second filler module, and the second filler module is a melon rice layer, an alkaline small round ceramsite layer, a zeolite layer and an alkaline large round ceramsite layer.

6. The unpowered buried vertical flow wetland rural domestic sewage treatment device according to claim 3, wherein: still include net bars pond (1), net bars pond (1) with pass through pipeline through connection between sedimentation tank (2), be provided with the net grid board in net bars pond (1), evenly be provided with the grid on the net grid board, the top in net bars pond (1) is provided with roof (14), the water inlet department in net bars pond (1) is provided with cuts dirty pipe, overflow outlet pipe (57) and the below of extension drain pipe (7) are provided with out water collecting vat.

7. The unpowered buried vertical flow wetland rural domestic sewage treatment device according to claim 6, wherein: the main tank body and the subsystem tank body (5) are integrally formed by glass fiber reinforced plastic materials; the bottom of the grid pond (1) is provided with a first concrete cushion layer (11), the bottom of the main box body and the composite vertical flow wetland system is provided with a second concrete cushion layer (12), one side of the water level regulating pond (53) connected with the lengthened drain pipe (7) is provided with a third concrete cushion layer (13), and the height of the bottom of the grid pond (1) is higher than that of the bottom of the main box body and the subsystem pond body (5).