CN104860398B - Intensive device and its method of construction for processing domestic sewage in rural areas - Google Patents

Abstract

The invention discloses an intensive device for treating domestic sewage in rural areas and a construction method thereof, relating to the field of sewage treatment, comprising a plurality of sewage collection pipes; an aerobic digestion tank of an anaerobic digestion system connected in sequence and an ecological purification system; several One end of the sewage collection pipeline is connected to the residential water outlet, and the other end is connected to the anaerobic digestion system; the anaerobic digestion system includes the first-level anaerobic digestion tank, the second-level anaerobic digestion tank and the third-level anaerobic digestion system connected in sequence pool; the calculation formulas for the volume of the primary anaerobic digester, the secondary anaerobic digester, the tertiary anaerobic digester and the aerobic digester are: V=aNqt/(24*1000), N is the number of people served ; a is the sewage production coefficient of 0.7-0.9; q is the per capita water consumption of 80-120L/d, and t is the time that water stays in the corresponding digester. The invention not only occupies a small area, but also has a low cost.

Description

Intensive device for treating rural domestic sewage and its construction method

technical field

The invention relates to the field of sewage treatment, in particular to an intensive device for treating rural domestic sewage and a construction method thereof.

Background technique

With the development of the rural economy and the continuous advancement of urbanization, the discharge of pesticide and fertilizer residues in rural farming and aquaculture sewage has increased sharply, causing serious pollution to natural water bodies and soil. It is discharged into rivers and lakes, causing serious water and soil pollution. After the water and soil are polluted, harmful compounds, heavy metals and other pollutants enter the human body through the food chain, leading to a sharp increase in the number of cancer patients in rural areas and seriously damaging the health of the rural population.

The United States, Japan and other developed countries have accumulated rich experience in the treatment of rural domestic sewage, mainly in the in-situ harmless treatment and resource treatment of pollutants. The method of on-site treatment is: discharge pollutants into natural systems such as land or wetlands for natural decomposition; the method of resource treatment is: discharge pollutants into sand filters, integrated aerobic treatment systems, purification tanks and other artificial The treatment system can not only purify pollutants, but also obtain biological fertilizers.

The use of in-situ harmless treatment and resource treatment has less energy consumption, lower cost, simple operation, and convenient management, which is in line with the current situation of backward rural development in my country, low technical content, shortage of talents, low degree of automation, and economic lag.

The invention patent with the application number 201010139475.0 discloses a domestic sewage treatment device, which includes a grit chamber, anaerobic digestion tank and an ecological purification filter connected in sequence. The sewage treated by this method can reach the national sewage comprehensive discharge The first level requirement of standard GB8978-1996. However, the device occupies a large area, is expensive to manufacture, has a complex structure, is difficult to manage and maintain, and is not suitable for use in rural areas.

Contents of the invention

In view of the defects existing in the prior art, the purpose of the present invention is to provide an intensive device for treating rural domestic sewage and its construction method, which not only occupies a small area, but also is convenient for operation and management, and has low construction and maintenance costs .

In order to achieve the above purpose, the technical solution adopted by the present invention is: an intensive device for treating domestic sewage in rural areas, including: several sewage collection pipes;

An anaerobic digestion system, an aerobic digestion tank and an ecological purification system connected in sequence; one end of the sewage collection pipes is connected to the residential water outlet, and the other end is connected to the anaerobic digestion system; the anaerobic digestion system includes The first-stage anaerobic digester, the second-stage anaerobic digester and the third-stage anaerobic digester connected in sequence;

The volume calculation formulas of the first-stage anaerobic digester, the second-stage anaerobic digester, the third-stage anaerobic digester and the aerobic digester are all: V=aNqt/(24*1000), and the N is the service population; said a is the sewage production coefficient of 0.7-0.9; said q is the per capita water consumption of 80-120L/d, and said t is the time that water stays in the corresponding digester, and the water in the first-level anaerobic digester The residence time of water is 4-7 days, the residence time of water in the secondary anaerobic digester is 2-4 days, the residence time of water in the third-stage anaerobic digester is 2-4 days, and the residence time of water in the aerobic digester is 2-4 days. The time to stay in the digester is 2 to 4 days.

On the basis of the above technical scheme, an anaerobic microbial filler layer is arranged inside the first-stage anaerobic digester, and the anaerobic microbial filler layer is parallel to the top of the first-stage anaerobic digester, and the anaerobic microbial filler layer is The distance between the top and the top of the primary anaerobic digester is 80-100cm.

On the basis of the above technical solution, the first-stage anaerobic digester and the second-stage anaerobic digester are connected through a first connecting pipe, and the first connecting pipe includes a water inlet end and a water outlet end, and the water inlet end is as high as At the water outlet, the water inlet is located inside the primary anaerobic digester, the water outlet is located inside the secondary anaerobic digester, the distance between the water inlet and the inner top of the primary anaerobic digester The distance between the water outlet and the inner bottom of the secondary anaerobic digester is 30-50cm.

On the basis of the above technical solution, the secondary anaerobic digester and the tertiary anaerobic digester are connected through a second connecting pipe, the second connecting pipe includes a water inlet end and a water outlet end, and the water inlet end is as high as At the water outlet, the water inlet is located inside the secondary anaerobic digester, the water outlet is located inside the third-stage anaerobic digester, the distance between the water inlet and the inner top of the second-stage anaerobic digester The distance between the water outlet and the inner bottom of the tertiary anaerobic digester is 30-50 cm.

On the basis of the above technical solution, the aerobic digestion tank is connected to the three-stage anaerobic digestion tank of the anaerobic digestion system through a third connecting pipe, the third connecting pipe includes a water inlet end and a water outlet end, and the inlet The water end is higher than the water outlet end, the distance between the water inlet end and the inner top of the three-stage anaerobic digester is 15-30cm, and the distance between the water outlet end and the inner bottom of the aerobic digester is 15-30cm.

On the basis of the above technical solution, the inside of the aerobic digestion tank is provided with an aeration device and an aerobic purification device, the aeration device is located above the aerobic purification device, and the aerobic purification device includes a top-down The aerobic microbial filler layer, straw carbon layer, gravel layer and filter screen are arranged in sequence. The distance between the aerobic microbial filler layer and the inner bottom of the aerobic digester is 30-50cm, and its cross section is square, and its surface area is the same as that of the aerobic microbial filler layer. The sample digesters have the same bottom area.

On the basis of the above technical solution, the ecological purification system includes several drainage units and several planting pipes, each drainage unit is provided with several drainage pipes, each of the drainage pipes corresponds to a planting pipe, each of the One end of each drainage tube is connected to the aerobic digestion tank, and the other end is connected to the clear water collection tank through the corresponding planting tube.

On the basis of the above technical scheme, the volume ratio of the first-stage anaerobic digester to the second-stage anaerobic digester, the third-stage anaerobic digester, and the aerobic digester is 3-5:1:1:1-2 .

On the basis of the above technical scheme, each of the sewage collection pipes extends into the interior of the primary anaerobic digester, the sewage collection pipe includes a water inlet end and a water outlet end, the water inlet end is higher than the water outlet end, and the water inlet The end is connected to the sewage outlet of the residents, the water outlet is located in the first-level anaerobic digestion tank, and the distance between the water outlet and the inner bottom of the first-level anaerobic digestion tank is 60-100cm.

A method for building an intensive device, characterized in that it comprises the following steps:

S1: Determine the population N of the construction site, the sewage production coefficient a, and the per capita water consumption q, and calculate the primary anaerobic digester, secondary anaerobic digester, and The volume of the three-stage anaerobic digester and the aerobic digester, the t is the time that the water stays in the corresponding digester, the time that the water stays in the first-stage anaerobic digester is 4 to 7 days, and the water stays in the second-stage anaerobic digester The time of staying in the anaerobic digester is 2 to 4 days, the time of water staying in the three-stage anaerobic digester is 2 to 4 days, and the time of water staying in the aerobic digester is 2 to 4 days. Step S2;

S2: Choose flat land as the construction site, dig and build the first-level anaerobic digestion tank, the second-level anaerobic digestion tank, the third-level anaerobic digestion tank and the aerobic digestion tank arranged in sequence on the construction site, and turn to step S3:

S3: Install grid wells and several sewage collection pipes, connect one end of several sewage collection pipes to the residential water outlet, and connect the other end to the first-level anaerobic digestion tank. The first connecting pipe is installed between the tanks, the second connecting pipe is installed between the secondary anaerobic digester and the third-stage anaerobic digester, the third connecting pipe is installed between the third-stage anaerobic digester and the aerobic digester, and the transfer Enter step S4;

S4: Install a backwashing device on the top of the primary anaerobic digester, install a tray and anaerobic microbial packing layer inside the primary anaerobic digester; install an aeration device and aerobic filter inside the aerobic digester Cleaning device, go to step S5;

S5: Install several drainage units and several planting pipes outside the aerobic digester, sow plants with purification effect on the planting pipes, and adjust the intensive device to normal operation.

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

(1) The intensive device for processing rural domestic sewage in the present invention includes an anaerobic digestion system and an aerobic digestion tank connected to each other, and the anaerobic digestion system includes a first-level anaerobic digestion tank and a second-level anaerobic digestion tank connected in sequence. Aerobic digester and three-stage anaerobic digester; among them, the volume calculation formulas of the first-stage anaerobic digester, the second-stage anaerobic digester, the third-stage anaerobic digester and the aerobic digester are: V=aNqt/( 24*1000), the N is the number of people served; the a is the sewage production coefficient of 0.7-0.9; the q is the per capita water consumption of 80-120L/d, and the t is the water staying in the corresponding digester Compared with the size of the digestion tank determined based on experience in the prior art, which easily leads to a larger footprint and higher cost, the invention determines the size of the digestion tank according to the time of sewage digestion, and the floor area is more reasonable and the production cost is lower. lower.

(2) The intensive device for processing rural domestic sewage in the present invention comprises a first connecting pipe, a second connecting pipe and a third connecting pipe, and the first connecting pipe, the second connecting pipe and the third connecting pipe all include Water end and water outlet end, each water inlet end is higher than the corresponding water outlet end, the distance between all water inlet ends and the inner top of the corresponding digestion tank is 15-30cm, and the water entering the water inlet end is the upper clear water in the digestion tank ;The distance between all water outlets and the inner bottom of the corresponding digester is 30-50cm. After the water at the outlet enters the next digester, it is located at the bottom of the digester. When the water moves upward from the bottom, the impurities inside will be Occurrence of natural sedimentation and purification.

(3) In the intensive device used for processing rural domestic sewage in the present invention, the heights of the first connecting pipe, the second connecting pipe and the third connecting pipe are successively reduced, and the sewage flows in an overflowing self-flowing manner without a pumping power system. And maintenance costs are low, can save energy.

(4) The intensive device for processing rural domestic sewage in the present invention includes an ecological purification system, the ecological purification system includes a planting pipe, the planting pipe is a circuitous and bent pipeline, plants are planted on the pipeline, and the plants can absorb heavy metals in the water , N, P compounds, deep water purification, beautify the environment, increase economic benefits.

Description of drawings

Fig. 1 is the structural representation of the intensive device for processing rural domestic sewage in the embodiment of the present invention;

Fig. 2 is a schematic structural diagram of an anaerobic digestion system.

In the figure: 1-sewage collection pipeline, 2-grid well, 3-anaerobic digestion system, 4-aerobic digestion tank, 5-aerobic microbial packing layer, 6-solar power generation device, 7-aeration device, 8 -drainage unit, 9-planting pipe, 10-clear water collection tank, 11-third connecting pipe, 12-second filter screen, 13-gravel layer, 14-backwashing device, 15-anaerobic microbial packing layer, 16- First-level anaerobic digester, 17-first connecting pipe, 18-second connecting pipe, 19-tray net, 20-secondary anaerobic digester, 21-tertiary anaerobic digester.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Referring to Fig. 1, an embodiment of the present invention provides an intensive device for treating domestic sewage in rural areas and a construction method thereof, including a plurality of sewage collection pipes 1, and the included angle between the sewage collection pipes 1 and the horizontal direction is 5° to 10° °, the diameter of the sewage collection pipe 1 is 10-15cm, and the sewage collection pipe 1 is made of PVC, or is made of brick and cement.

It includes an anaerobic digestion system 3 , an aerobic digestion tank 4 , an ecological purification system and a clear water collection tank 10 connected in sequence.

A number of sewage collection pipes 1 are connected to the residential water outlet at the higher end, and connected to the anaerobic digestion system 3 at the lower end, and each sewage collection pipe 1 is provided with a grid well near the anaerobic digestion system 3 2. The inside of the grid well 2 is provided with a first filter screen, and the grid well 2 is provided with an openable well cover.

A one-way valve is provided between each sewage collecting pipeline 1 and the anaerobic digestion system 3, so that the sewage can only flow from the pipeline to the anaerobic digestion system 3, and will not overflow from the anaerobic digestion system 3 to the pipeline. The odor produced in the digestive system 3 will not enter the room along the pipeline or float into the outdoor air, thus ensuring that the environment is not polluted.

Referring to Fig. 2, the anaerobic digestion system 3 includes a first-stage anaerobic digester 16, a second-stage anaerobic digester 20, and a third-stage anaerobic digester 21 connected in sequence, and each sewage collection pipe 1 undergoes anaerobic digestion The outside of the pool is collected, and then all extend into the inside of the primary anaerobic digester 16. The sewage collection pipeline 1 includes a water inlet and an outlet. The inlet is higher than the outlet. The inlet is connected to the sewage outlet of the residents. In the primary anaerobic digester 16, the distance between the water outlet and the inner bottom of the primary anaerobic digester 16 is 80-100 cm.

The primary anaerobic digester 16 and the secondary anaerobic digester 20 are connected by a first connecting pipe 17, the first connecting pipe 17 includes a water inlet and an outlet, the inlet is higher than the outlet, and the inlet is located at the first level The inside of the anaerobic digester 16 is 15 to 30 cm away from the top of the primary anaerobic digester 16; The distance between them is 30-50cm.

The secondary anaerobic digester 20 and the tertiary anaerobic digester 21 are connected by a second connecting pipe 18, the second connecting pipe 18 includes a water inlet and an outlet, the inlet is higher than the outlet, and the inlet is located at the second The inside of the anaerobic digester 20 is 15 to 30 cm away from the top of the secondary anaerobic digester 20; The distance between them is 30-50cm.

The bottom of the primary anaerobic digester 16 is arranged obliquely, forming an angle of 30° to 45° with the horizontal plane. The interior of the primary anaerobic digester 16 is provided with an anaerobic microbial packing layer 15, and the anaerobic microbial packing layer 15 is in contact with the horizontal plane. The angle between them is 0°～15°, the cross-sectional area of the anaerobic microbial packing layer 15 is equal to the cross-sectional area of the primary anaerobic digester 16, and the bottom of the anaerobic microbial packing layer 15 is provided with a support net 19. The distance between the top of the anaerobic microbial packing layer 15 and the top of the primary anaerobic digester 16 is 80-100 cm, and the inner top of the primary anaerobic digester 16 is provided with a backwashing device 14, and the primary anaerobic digester 16 The top of the tank is provided with a biogas outlet pipe and a biogas power generation device, and the outlet pipe leads into the interior of the biogas power generation device.

After the sewage enters the bottom of the first-stage anaerobic digester 16 along the sewage collection pipe 1, the impurities with higher density in the sewage directly settle at the bottom of the first-stage anaerobic digester 16 to form silt, and the water and the less dense impurities are mixed together. Floating upward in the first-stage anaerobic digester 16.

The sludge is discharged through the sludge discharge ditch, and the sludge settled at the bottom of the primary anaerobic digester 16 undergoes long-term anaerobic digestion, and the sludge is rich in organic matter, mainly nitrogen, phosphorus, potassium and other elements, humic acid, trace nutrients, A variety of amino acids, enzymes and beneficial microorganisms, loose texture, good moisture retention performance, moderate pH, can not only improve the soil, but also meet the needs of crop growth, and is also very suitable for the growth of loaches, earthworms and eels. Therefore, the cleared sludge is directly used as a substrate to raise loach, earthworms, eels or as a fertilizer for crop planting. It can not only improve the ecological environment, develop agricultural production, but also improve economic benefits.

Due to the large distance between the anaerobic microbial packing layer 15 and the bottom of the first-stage anaerobic digestion tank 16, some impurities will gather and then settle down to the first-stage anaerobic digestion tank during the upward floating process of water and less dense impurities. At the bottom of the pool 16, the remaining impurities are filtered through the support net 19, and the larger impurities are filtered out, and after water, microorganisms and water-miscible substances are obtained, they pass through the anaerobic microbial packing layer 15, and the anaerobic microbial packing layer 15 It can decompose organic matter in water, reduce the content of organic matter in water, and obtain preliminary purified water and methane gas. Methane can be exported along the outlet pipe and used as fuel after being purified.

The volume ratio of the first-stage anaerobic digester 16 to the second-stage anaerobic digester 20 , the third-stage anaerobic digester 21 , and the aerobic digester 4 is 3-5:1:1:1-2, and the topography decreases successively. The water inlet ends of the sewage collection pipe 1 , the first communication pipe 17 , the second communication pipe 18 and the third communication pipe 11 are lowered sequentially.

After the sewage is purified by the primary anaerobic digester 16 for 4 to 6 days, it enters the secondary anaerobic digester 20 along the first connecting pipe 17, and is digested in the secondary anaerobic digester 20 for 2 to 4 days, then passes through the second connecting pipe 18 Enter the three-stage anaerobic digester 21, and automatically enter the aerobic digester 4 after being digested in the three-stage anaerobic digester 21 for 2 to 4 days. The residence time of the sewage in the aerobic digester 4 is 2 to 4 days.

Since the primary anaerobic digester 16, the secondary anaerobic digester 20 and the tertiary anaerobic digester 21 are all in an airtight state, the oxygen content is low, making it difficult for the harmful bacteria in the sewage to survive, thereby reducing the harmful bacteria in the sewage. bacteria content.

The three-stage anaerobic digester 21 is connected to the aerobic digester 4 through the third connecting pipe 11, the third connecting pipe 11 includes a water inlet and an outlet, the water inlet is higher than the outlet, and the water inlet is connected to the third-stage anaerobic digester. The distance between the inner tops of the digester 21 is 15-30 cm, and the distance between the water outlet and the inner bottom of the aerobic digester 4 is 30-50 cm.

The outside of the aerobic digester 4 is provided with a solar power generation device 6, and the inside of the aerobic digester 4 is provided with an aeration device 7 and an aerobic purification device. The aeration device 7 is located above the aerobic purification device. The solar power generation device 6 is electrically connected, the aeration device 7 is electrically connected to the biogas power generation device, and the aerobic purification device includes an aerobic microbial filler layer 5, a straw carbon layer, a gravel layer 13 and a second filter screen 12 arranged in sequence from top to bottom. , the surface area of the aerobic microbial filler layer 5 is equal to the cross-sectional area of the aerobic digester 4 .

The straw carbon layer, the gravel layer 13 and the second filter screen 12 can further decompose and transform the pollution components, further purify the water quality, and improve the transparency of the water body.

The volumes of the primary anaerobic digester 16, the secondary anaerobic digester 20, the tertiary anaerobic digester 21 and the aerobic digester 4 are calculated according to the following formula:

V＝aNqt/24*1000

In this formula: V——volume, the unit is m ³ ;

N - the number of people served;

a——The production coefficient of sewage;

q——per capita water consumption, liter/day (L/d);

t—the time that water stays in the digester, in days (d);

24*1000——conversion factor.

Under the existing conditions in our country, q is 80-120L/d, and a is 0.7-0.9.

The time that water stays in the primary anaerobic digester 16 is 4 to 7 days, the time that water stays in the secondary anaerobic digester 20 is 2 to 4 days, and the time that water stays in the third-stage anaerobic digester 21 The time is 2 to 4 days, and the time for the water to stay in the aerobic digester 4 is 2 to 4 days.

The calculation method for the volume of the digester in the intensive device, the digester includes the interconnected anaerobic digestion system 3 and the aerobic digester 4, the anaerobic digestion system 3 includes the first-stage anaerobic digester 16, the second-stage anaerobic digester Oxygen digester 20 and tertiary anaerobic digester 21.

The residence time t of sewage in the primary anaerobic digester 16 is 4 to 7 days, the residence time t of sewage in the secondary anaerobic digester 20 is 2 to 4 days, and the residence time of sewage in the third stage anaerobic digester 21 t is 2-4 days, and the residence time t of the sewage in the aerobic digester 4 is 2-4 days.

The ecological purification system includes several drainage units 8 and several planting tubes 9, each drainage unit 8 is provided with several drainage tubes, each drainage tube corresponds to a planting tube 9, and each drainage tube has one end connected to the aerobic digestion tube. The pool 4 is connected, and the other end is connected with the clear water collection pool through the corresponding planting tube 9. The planting tube 9 is a circuitous and bent pipeline. There are several planting holes on the planting tube 9, and hydroponic plants are planted in the planting holes.

The hydroponic plant in the planting hole within 10m of each planting tube 9 is adjacent to the drainage tube is at least one of Chlorophytum, Mirabilis, Violet Hosta and Commelina, and each planting tube 9 is more than 10m away from the planting hole of the drainage tube. The hydroponic plants in it are at least one of cress, lettuce, rape, Chinese cabbage, endive, lettuce, tomato and cucumber.

The cell membranes of spider plant, mirabilis, hosta and commelina contain a large number of metal ion transport proteins: CDF family proteins, NRAMP family proteins and ZIP family proteins. Under the action of metal ion transport proteins, the plants have a strong resistance to metal ions. Absorption and transportation capacity, the metal ions absorbed by plants are mainly concentrated in the vacuoles, cell walls and epidermis of leaf epidermis cells, and some of them exist in the form of chelates. Metal ions will not enter the interior of plant cells and will not damage plants.

Chlorophytum, mirabilis, hosta and commelina can not only beautify the environment, but also increase economic benefits.

Cress, lettuce, rape, Chinese cabbage, chicory, lettuce, tomato and cucumber have a short growth cycle, large biomass, and high yield, which significantly improves space utilization, increases agricultural output, and promotes agricultural development.

A method for constructing an intensive device, comprising the steps of:

A. Determine the population N of the construction site, the sewage production coefficient a and the per capita water consumption q, and calculate the primary anaerobic digester 16 and the secondary anaerobic digester according to the volume calculation formula V=aNqt/(24*1000) 20. The volume of the third-stage anaerobic digester 21 and the aerobic digester 4, the t is the time that the water stays in the corresponding digester, and the time that the water stays in the first-stage anaerobic digester 16 is 4 to 7 days 1. The time for water to stay in the secondary anaerobic digester 20 is 2 to 4 days, the time for water to stay in the third-stage anaerobic digester 21 is 2 to 4 days, and the time for water to stay in the aerobic digester 4 For 2 to 4 days, turn to step B.

B: Choose flat land as the construction site, dig and build the first-level anaerobic digester 16, the second-level anaerobic digester 20, the third-level anaerobic digester 21 and the aerobic digester 4 arranged in sequence on the construction site. After the inner walls of the first-level anaerobic digestion tank 16, the second-level anaerobic digestion tank 20, the third-level anaerobic digestion tank 21, and the aerobic digestion tank 4 are coated with waterproof materials and dried, they are injected with clean water and left for 3 days. It is determined that no water seepage occurs. Go to step C.

C: Install grid wells 2 and several sewage collection pipes 1, connect one end of several sewage collection pipes 1 to the residential water outlet, and connect the other end to the primary anaerobic digester 16, and connect the primary anaerobic digester 16 and The first connecting pipe 17 is installed between the secondary anaerobic digesters 20 to connect, the second connecting pipe 18 is installed between the secondary anaerobic digesters 20 and the three-stage anaerobic digesters 21, and the third-stage anaerobic digesters 21 Install the third communication pipe 11 between the aerobic digester 4 and turn to step D.

D: Install a biogas power generation device outside the primary anaerobic digester 16, install a backwash device 14 on the top of the primary anaerobic digester 16, and install a support net 19 and an anaerobic digester 16 inside the primary anaerobic digester 16. Aerobic microbial filler layer 15; Solar power generation device 6 is installed on the top of aerobic digester 4, aeration device 7 and aerobic purification device are installed in the inside of aerobic digestion tank 4, solar power generation device 6 and aeration device 7 Electric connection, the aeration device 7 is electrically connected with the biogas power generation device, and proceeds to step E;

E: Install several drainage units 8 and several planting pipes 9 outside the aerobic digester 4, sow plants with purification effect on the planting pipes 9, adjust the intensive device to normal operation and put it into use.

The sewage treated by the intensive device for treating rural domestic sewage in the present invention can reach the first-level standard of the "Comprehensive Wastewater Discharge Standard" GB 8978-2006.

Below, the present invention is described in detail by an embodiment

Example 1

Taking a small village in Hubei as a test site, the village has a permanent population of 100 people, the size of the primary anaerobic digester 16 is 400cm*350cm*400cm, the size of the secondary anaerobic digester 20 is 250cm*250cm*260cm, The size of the three-stage anaerobic digester 21 is 300cm*300cm*180cm, and the size of the aerobic digester 4 is 400cm*300cm*100cm.

The sewage collection pipe 1 adopts a PVC pipe with a diameter of 15cm. The sewage collection pipe 1 is directly connected to the domestic sewage outlet of each household. The grid well 2 is rectangular and its size is 50cm*80cm*30cm. Filter screen 12, the first filter screen adopts stainless steel wire mesh with a pore size of 1.5cm*1.5cm; primary anaerobic digester 16, secondary anaerobic digester 20, tertiary anaerobic digester 21 and aerobic digester 4 They are all made of bricks and cement, and the first 17 connecting pipes, the second 18 connecting pipes and the third connecting pipe 11 are all made of PVC pipes with a diameter of 15cm.

The number of drainage units 8 in the present embodiment is 10, the number of planting tubes 9 is 80, and each drainage unit 8 is provided with 8 drainage tubes. The hydroponic plants are selected from daffodils, lettuce and garlic, from the hydroponic system. The clear water flowing out is directly used for fish farming and farmland irrigation.

The construction process of the sewage treatment system is simple, and the purification effect is good. The removal rates of COD (Chemical Oxygen Demand, chemical oxygen demand), TN (total nitrogen, total nitrogen), TP (total phosphorus), and total phosphorus are all above 80%. See Table 1 for the results of water quality testing after one month of operation.

It can be seen from this that the intensive device for treating rural domestic sewage in the present invention can better purify rural domestic sewage.

Table 1 Test data of intensive domestic sewage treatment project

The present invention is not limited to the above-mentioned embodiments. For those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also considered protection of the present invention. within range. The content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims (10)

1. a kind of intensive device for processing domestic sewage in rural areas, including：

Some sewage collection conduits (1)；

Anaerobic digester system (3), aerobic digestion tank (4) and the ecological purification system being sequentially connected with；Some sewage manifold trunks Road (1) is one end and is connected with urbanite water consumption discharge outlet, and the other end is connected with anaerobic digester system (3)；The anaerobic digestion system System (3) includes the one-level anaerobic digester (16), secondary anaerobic digester (20) and the three-level anaerobic digester (21) that are sequentially connected with； Simultaneously, it is characterised in that：

The one-level anaerobic digester (16), secondary anaerobic digester (20), three-level anaerobic digester (21) and aerobic digestion tank (4) volume calculations formula is：V=aNqt/ (24*1000), the N are the size of population of service；The a is the product of sewage Raw coefficient 0.7~0.9；The q is 80~120L/d of water consumption per capita, and the t is water residence time in correspondence digester, Water residence time in one-level anaerobic digester (16) is 4~7 days, water residence time in secondary anaerobic digester (20) For 2~4 days, water, residence time was 2~4 days, water stop in aerobic digestion tank (4) in three-level anaerobic digester (21) Time is 2~4 days；

The one-level anaerobic digester (16) and secondary anaerobic digester (20) are connected by the first communicating pipe (17), described two grades Anaerobic digester (20) and three-level anaerobic digester (21) are connected by the second communicating pipe (18), and the aerobic digestion tank (4) is led to Third connecting pipe (11) is crossed to be connected with the three-level anaerobic digester (21) of anaerobic digester system (3).

2. it is used to process the intensive device of domestic sewage in rural areas as claimed in claim 1, it is characterised in that：The one-level is detested Oxygen digester (16) is internally provided with anaerobe packing layer (15), and the anaerobe packing layer (15) detests with one-level Oxygen digester top is parallel, between the top of the anaerobe packing layer (15) and one-level anaerobic digester (16) top Distance is 80~100cm.

3. it is used to process the intensive device of domestic sewage in rural areas as claimed in claim 1, it is characterised in that：Described first connects Siphunculus (17) includes water inlet end and water side, and the water inlet end is higher than water side, and the water inlet end is located at one-level anaerobic digester (16) inside, the water side is located at the inside of secondary anaerobic digester (20), the water inlet end and one-level anaerobic digester (16) the distance between top is 15~30cm in, the distance between water side and secondary anaerobic digester (20) interior bottom for 30~ 50cm。

4. it is used to process the intensive device of domestic sewage in rural areas as claimed in claim 3, it is characterised in that：Described second connects Siphunculus (18) includes water inlet end and water side, and the water inlet end is higher than water side, and the water inlet end is located at secondary anaerobic digester (20) inside, the water side is located at the inside of three-level anaerobic digester (21), the water inlet end and secondary anaerobic digester (20) the distance between top is 15~30cm in, and the distance between the water side and three-level anaerobic digester (21) interior bottom are 30 ~50cm.

5. it is used to process the intensive device of domestic sewage in rural areas as claimed in claim 1, it is characterised in that：Described 3rd connects Siphunculus (11) includes water inlet end and water side, and the water inlet end is higher than water side, the water inlet end and three-level anaerobic digester (21) the distance between top is 15~30cm in, the distance between the water side and aerobic digestion tank (4) interior bottom for 15~ 30cm。

6. it is used to process the intensive device of domestic sewage in rural areas as claimed in claim 1, it is characterised in that：It is described aerobic to disappear That changes pond (4) is internally provided with aerator (7) and aerobic purifier, and the aerator (7) is positioned at aerobic purifier Top, the aerobic purifier include set gradually from top to bottom and aerobic microbiological packing layer (5), stalk carbon-coating, gravel Rock layers (13) and filter screen (12), aerobic microbiological packing layer (5) with support well the distance between digester (4) interior bottom for 30~ 50cm, its cross section is square, and its surface area is equal with good sample digester floor space.

7. it is used to process the intensive device of domestic sewage in rural areas as claimed in claim 1, it is characterised in that：It is described ecological net Change system includes some drainage units (8) and some planting tubes (9), and some drainage tubes are provided with each drainage unit (8), Described each drainage tube is corresponding with a planting tube (9), and described each drainage tube is one end with aerobic digestion tank (4) even Connect, the other end is connected by corresponding planting tube (9) with clear water collecting pit.

8. the intensive device for processing domestic sewage in rural areas as any one of claim 1 to 7, its feature exists In：The one-level anaerobic digester (16) and secondary anaerobic digester (20), three-level anaerobic digester (21), aerobic digestion tank (4) volume ratio is 3~5:1:1:1~2.

9. the intensive device for processing domestic sewage in rural areas as any one of claim 1 to 7, its feature exists In：The every sewage collection conduits (1) stretch into the inside of one-level anaerobic digester (16), and sewage collection conduits (1) include Water inlet end and water side, the water inlet end are higher than water side, and water inlet end is connected with resident's sewage draining exit, and water side is located at one-level anaerobism In digester (16), the distance between interior bottom of water side and one-level anaerobic digester (16) is 60~100cm.

10. a kind of method of construction for processing the intensive device of domestic sewage in rural areas, it is characterised in that including following step Suddenly：

S1：It is determined that size of population N, the generation coefficient a of sewage on construction ground and per capita water consumption q, according to volume calculations formula V= ANqt/ (24*1000), first order calculation anaerobic digester (16), secondary anaerobic digester (20), three-level anaerobic digester (21) and The volume of aerobic digestion tank (4), the t is water residence time in correspondence digester, and water is in one-level anaerobic digester (16) Middle residence time is 4~7 days, water residence time in secondary anaerobic digester (20) is 2~4 days, water is in three-level anaerobism In digester (21) residence time be 2~4 days, water in aerobic digestion tank (4) residence time be 2~4 days, be transferred to step S2；

S2：Selection level land as building site, dug on building site build be sequentially arranged one-level anaerobic digester (16), two grades Anaerobic digester (20), three-level anaerobic digester (21) and aerobic digestion tank (4), are transferred to step S3：

S3：Some sewage collection conduits (1) are installed, one end of the sewage collection conduits (1) is connected with urbanite water consumption discharge outlet, The other end is connected with one-level anaerobic digester (16), pacifies between one-level anaerobic digester (16) and secondary anaerobic digester (20) The first communicating pipe (17) connection is filled, second is installed between secondary anaerobic digester (20) and three-level anaerobic digester (21) and is connected Pipe (18), installs third connecting pipe (11) between three-level anaerobic digester (21) and aerobic digestion tank (4), is transferred to step S4；

S4：Back purge system (14) is installed on the interior top of one-level anaerobic digester (16), in the interior of one-level anaerobic digester (16) Portion's mounting bracket net (19) and anaerobe packing layer (15)；Aerator (7) is installed in the inside of aerobic digestion tank (4) to become reconciled Oxygen purifier, is transferred to step S5；

S5：Outside by aerobic digestion tank (4) installs some drainage units (8) and some planting tubes (9), on planting tube (9) Plant of the sowing with catharsis.