CN214654193U - Rural domestic sewage purification unit - Google Patents

Abstract

The utility model relates to a rural domestic sewage purification unit belongs to sewage treatment technical field, has solved the problem that current rural domestic sewage treatment unit can't effectively purify the complicated rural domestic sewage of composition. Rural domestic sewage purification unit includes: the water tank is provided with a water inlet and a water outlet, the water inlet is connected with a water inlet pipe, the water outlet is connected with a water return pipe, the water inlet pipe is connected with the water return pipe through a circulating water pump, and the water tank, the water inlet pipe and the water return pipe form a circulating path; the geoelectricity extraction device is arranged in the water tank and is used for adsorbing organic pollutants in domestic sewage; the multistage filtering component is arranged in the box body and is used for physically filtering impurities in the domestic sewage. The utility model has the advantages of simple structure, convenient operation, the adoption of novelty ground electrochemical extraction technique carries out the electrolytic adsorption purification treatment to rural domestic sewage, and purification treatment is effectual.

Description

Rural domestic sewage purification unit

Technical Field

The utility model relates to a sewage treatment technical field especially relates to a rural domestic sewage purification unit.

Background

The rural sewage mainly comprises rural domestic sewage (feces and urine water, laundry water, kitchen water and the like) and rural production wastewater (scattered livestock and poultry breeding, small and miniature enterprises in villages and towns and the like).

Generally speaking, the concentration of each pollutant in rural domestic sewage is relatively low, but the water quality changes greatly: most rural domestic sewage has little difference in properties, and basically contains no or little heavy metals and toxic and harmful substances. However, due to the influence of various factors such as the life style of farmers, the rural sewage is rich in organic substances, nutrient substances such as nitrogen and phosphorus, suspended substances, pathogenic bacteria and other pollution components, and has strong biodegradability. Rural domestic sewage comprises domestic washing sewage, kitchen and toilet flushing sewage and the like, has the characteristics of wide pollution range, multiple sources, difficult collection in dispersion and complex components, and has higher concentrations of suspended matters, organic matters and nitrogen and phosphorus. Generally speaking, the amount of rural domestic sewage is generally lower than that of cities and towns, but due to the lack of a perfect sewage and treatment system, weak economic foundation and the like, the treatment rate of the rural domestic sewage is far lower than that of the cities and towns, and the rural domestic sewage and production wastewater are directly discharged without being treated, so that surface water or underground water is polluted, the safety of drinking water of surrounding residents is influenced, and the water environment health is directly threatened.

The existing rural domestic sewage treatment device mostly adopts a physical treatment and purification mode of precipitation and filter screen filtration, has unsatisfactory treatment effect on rural domestic sewage with complex components, and cannot effectively purify the rural domestic sewage.

SUMMERY OF THE UTILITY MODEL

In view of the above analysis, the utility model aims at providing a rural domestic sewage purification unit for solve the unable rural domestic sewage that effectively purifies the composition complicacy of current rural domestic sewage treatment unit, the poor problem of treatment effect.

The purpose of the utility model is mainly realized through the following technical scheme:

a rural domestic sewage purification treatment device comprises:

the water tank is provided with a water inlet and a water outlet, the water inlet is connected with a water inlet pipe, the water outlet is connected with a water return pipe, the water inlet pipe is connected with the water return pipe through a circulating water pump, and the water tank, the water inlet pipe and the water return pipe form a circulating path;

the geoelectricity extraction device is arranged in the water tank and is used for adsorbing organic pollutants in the domestic sewage;

and the multi-stage filtering component is arranged in the water tank and is used for physically filtering impurities in the domestic sewage.

On the basis of the above scheme, the utility model discloses following improvement has still been made:

in a preferred scheme of the utility model, the water tank is of a ladder structure and at least comprises two-step tank bodies, and the height of each step of tank body is reduced along the water flow direction in sequence; in two adjacent step boxes, the lateral wall of the upper step box is provided with a water outlet, the top plate of the lower step box is of a hollow structure, and a filtering transverse plate is laid on the hollow structure.

In a preferred scheme of the utility model, the water tank comprises a first-stage tank body, a second-stage tank body and a third-stage tank body; the water inlet of the water tank is arranged on the side wall of the first-stage tank body, and the height of the water inlet is higher than that of the top plate of the second-stage tank body; a first water outlet is formed in the side wall of the first-stage box body, a second water outlet is formed in the side wall of the second-stage box body, and a third water outlet is formed in the side wall of the third-stage box body; the third water outlet is a water outlet of the water tank and is connected with the water return pipe.

In a preferred embodiment of the present invention, the second stage box body has a second top plate, the third stage box body has a third top plate, and the first filtering transverse plate and the second filtering transverse plate are respectively laid on the second top plate and the third top plate; the periphery of the second top plate is provided with a first baffle plate which is higher than the upper surface of the first filtering transverse plate; and second baffle plates are arranged around the third top plate and are higher than the upper surfaces of the second filtering transverse plates.

According to a preferred scheme of the utility model, the multistage filtering component comprises a first filtering vertical clapboard and a second filtering vertical clapboard, and the first filtering vertical clapboard is positioned at the upstream of the second filtering vertical clapboard; the first vertical filter partition is used for filtering large granular impurities in domestic sewage, and the second vertical filter partition is used for filtering small granular particle size granular impurities in the domestic sewage.

In a preferred scheme of the utility model, the first filtering vertical baffle is arranged in the first stage box body, and the second filtering vertical baffle is arranged in the second stage box body; the height of the first filtering vertical partition plate is less than or equal to that of the first-stage box body, and the height of the second filtering vertical partition plate is less than or equal to that of the second-stage box body.

The utility model discloses a preferred scheme, earth's electric extraction element's quantity is two, and two earth's electric extraction element set up respectively in second order box and third order box, and are located the second and filter the both sides of erecting the baffle.

The utility model discloses an optimal scheme, ground electric extraction element is graphite carbon-point including drawing the electrode, the center that draws the electrode, and graphite carbon-point cladding has adsorbing material.

The utility model discloses an optimal scheme, the bottom surface of water tank is the slope, and the slope of slope is 5%, and the bottom of slope is equipped with the drain, and the drain is equipped with the blowoff valve.

The utility model discloses a preferred scheme, the water tank still is equipped with the water purification outlet, and the drain valve is installed to the water purification outlet.

Compared with the prior art, the utility model discloses can realize one of following beneficial effect at least:

a) the utility model provides a rural domestic sewage purification unit, the adoption of novelty geoelectricity chemical extraction technique carries out electrolytic adsorption purification treatment to rural domestic sewage, utilizes circulating water pump to make water tank, inlet tube and wet return constitute the circulation path simultaneously, provides sufficient operating time for geoelectricity extraction element, can effectively get rid of the organic matter in the domestic sewage, promotes the purification treatment effect.

b) The utility model provides a rural domestic sewage purification treatment device, set up the water tank as the echelonment structure, through arranging the filtration vertical baffle that filters coarse grain, filter the fine particle in proper order in different ladder box positions along the rivers direction, the height of each step box reduces along the rivers direction in proper order, the lateral wall of first-order box is equipped with the delivery port, the delivery port sets up on the lateral wall of two ladder junctions, the roof of next step is equipped with filters the diaphragm, the delivery port through the lowest order box is linked together through external circulating water pump and highest order box water inlet, so as to realize the hydrologic cycle of certain time, the water that flows out by last-order box delivery port falls on the filtration diaphragm of next-order box, and get into the next-order box after filtering the diaphragm filters, impurity then stays on filtering the diaphragm, in whole circulation, sewage passes through multistage filtration vertical baffle, filter diaphragm and ground electric extraction element's purification, the purifying effect is better.

c) The utility model provides a rural domestic sewage purification unit, first geoelectricity extraction element set up in the second order box, and lie in the second and filter the upper reaches of erecting the baffle, and second geoelectricity extraction element sets up in the third order box, and first geoelectricity extraction element's effective handling area is greater than the effective handling area of second geoelectricity extraction element, can guarantee the purification treatment effect of sewage cycle in-process.

The utility model discloses in, can also make up each other between the above-mentioned each technical scheme to realize more preferred combination scheme. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout the drawings.

FIG. 1 is a perspective view of a rural domestic sewage purification treatment device of the utility model;

FIG. 2 is a front view of the rural domestic sewage purification treatment device of the utility model;

FIG. 3 is a top view of the rural domestic sewage purification treatment apparatus of the present invention;

FIG. 4 is a sectional view of a rural domestic sewage purification treatment device of the utility model;

fig. 5 is a schematic structural diagram of the earth current extracting device of the present invention;

fig. 6 is a schematic structural view of another rural domestic sewage purification treatment device of the present invention.

Reference numerals:

1-a water tank; 2-water inlet pipe; 3, a water return pipe; 4-circulating water pump; 5-geoelectricity extraction means; 6-a transformer rectifier; 7-first stage box body; 8-a second-stage box body; 9-a third-order box body; 10-a first water outlet; 11-a second water outlet; 12-a third water outlet; 13-a water inlet; 14-a purified water outlet; 15-a first vertical filtering baffle; 16-a second filtering vertical partition plate; 17-a first top panel; 18-a second top panel; 19-a third top panel; 20-a wire; 21-a graphite carbon rod; 22-an adsorbent material; 23-a first baffle; 24-a second baffle; 25-a sewage draining outlet.

Detailed Description

The following detailed description of the preferred embodiments of the invention, which is to be read in connection with the accompanying drawings, forms a part of this application, and together with the embodiments of the invention, serve to explain the principles of the invention and not to limit its scope.

The electrochemical extraction method is a geochemical method based on the dynamic equilibrium state of ions in a medium, and utilizes an artificial electric field to break the dynamic equilibrium of the ions in the medium, so as to promote the ions to migrate towards an ion collector, and then the ions in the medium reach the dynamic equilibrium again. The components in rural sewage are very complex, the concentration of suspended matters, organic matters and nitrogen and phosphorus in the sewage is high, and the organic matters in the domestic sewage are charged, so that the purification treatment of the rural domestic sewage by adopting the electrochemical technology is a new idea.

The utility model discloses a concrete embodiment discloses a rural domestic sewage purification unit, carries out purification treatment to domestic sewage based on the earth electrochemical principle, as shown in figure 1 to figure 5, rural domestic sewage purification unit includes:

the domestic sewage purification treatment device comprises a water tank 1, wherein domestic sewage is purified in the water tank 1, the water tank 1 is provided with a water inlet 13 and a water outlet, the water inlet 13 is connected with a water inlet pipe 2, the water outlet is connected with a water return pipe 3, the water inlet pipe 2 is connected with the water return pipe 3 through a circulating water pump 4, and the water tank 1, the water inlet pipe 2 and the water return pipe 3 form a circulating path;

the geoelectricity extraction device 5 is arranged in the water tank 1 and is used for adsorbing organic pollutants in the domestic sewage;

multistage filtering component, multistage filtering component locate in water tank 1 for carry out the physics to the impurity in the domestic sewage and filter.

In a preferred embodiment of this embodiment, the water tank 1 is further provided with a purified water outlet 14, a drain valve is installed at the purified water outlet 14, during the sewage purification process, the drain valve is closed, after the purification is completed, the drain valve is opened, and the purified domestic sewage is discharged through the purified water outlet 14.

A preferred embodiment of this embodiment, water tank 1 is stair structure, at least, include two steps of boxes, 1 integrated into one piece setting of water tank, the inside intercommunication of each step of box, the height of each step of box reduces in proper order along the rivers direction, in the adjacent two steps of boxes, the lateral wall of last one-step box is equipped with the delivery port, the delivery port sets up on the lateral wall of two ladder junctions, the roof of next step of box is hollow out construction, hollow out construction upper berth is equipped with the filtration diaphragm, the roof of next step of box is fallen to the water that flows by last one-step box delivery port, and filter the diaphragm and filter the back and get into in the next step of box, impurity then stays on filtering the diaphragm, after a period, change and filter the diaphragm.

Illustratively, the water tank 1 comprises a three-stage tank body, and specifically comprises a first-stage tank body 7, a second-stage tank body 8 and a third-stage tank body 9, wherein the heights of the first-stage tank body 7, the second-stage tank body 8 and the third-stage tank body 9 are sequentially reduced; the first-stage box body 7 is provided with a first top plate 17, the second-stage box body 8 is provided with a second top plate 18, the third-stage box body 9 is provided with a third top plate 19, the heights of the first top plate 17, the second top plate 18 and the third top plate 19 are sequentially reduced, at least the second top plate 18 and the third top plate 19 are hollow structures, a first filtering transverse plate is laid on the hollow structure of the second top plate 18, and a second filtering transverse plate is laid on the hollow structure of the third top plate 19; the water inlet 13 is arranged on the side wall of the first-stage box body 7, and the height of the water inlet 13 is higher than that of the top plate of the second-stage box body 8; the lateral wall of the first-stage box body 7 is provided with a first water outlet 10, the lateral wall of the second-stage box body 8 is provided with a second water outlet 11, the lateral wall of the third-stage box body 9 is provided with a third water outlet 12, wherein the third water outlet 12 can be used as a water outlet of the water tank 1, and the third water outlet 12 is connected with the water return pipe 3.

In a preferred embodiment of this embodiment, the first baffle 23 is disposed around the second top plate 18, and the height of the first baffle 23 is greater than the upper surface of the first filtering transverse plate; and a second baffle plate 24 is arranged around the third top plate 19, and the height of the second baffle plate 24 is greater than the upper surface of the second filtering transverse plate. First baffle 23 and second roof 18, second baffle 24 and third roof 19 all enclose into the trough-shaped structure, can prevent that water from overflowing, improve the filter effect.

In a preferred embodiment of the present embodiment, the electric current extraction device 5 comprises a power source, a conducting wire 20, and an extraction electrode, wherein the extraction electrode is connected with the power source through the conducting wire 20. Specifically, the center of drawing the electrode is graphite carbon-point 21, and the power passes through wire 20 and links to each other with graphite carbon-point 21, and the cladding has adsorption material on the graphite carbon-point, and used adsorption material is high bubble sponge or cotton wool.

Since the geoelectricity extraction device needs a dc working voltage, the geoelectricity extraction device 5 is connected to the mains supply through the transformer rectifier 6, and the mains supply is converted into a dc working voltage corresponding to the geoelectricity extraction device 5 through the transformer rectifier 6.

In a preferred embodiment of this embodiment, the multistage filtering assembly comprises a first vertical filtering partition 15 and a second vertical filtering partition 16, the first vertical filtering partition 15 is located at the upstream of the second vertical filtering partition 16, the first vertical filtering partition 15 is used for coarse filtering and filtering large granular impurities in domestic sewage, and the second vertical filtering partition 16 is used for fine filtering and filtering small granular impurities in domestic sewage.

In a preferred embodiment of this embodiment, the first vertical filtering baffle 15 is disposed in the first stage casing 7, and the second vertical filtering baffle 16 is disposed in the second stage casing 8. The height of the first filtering vertical clapboard 15 is less than or equal to the height of the first-stage box body 7, and the height of the second filtering vertical clapboard 16 is less than or equal to the height of the second-stage box body 8. Preferably, the distance between the top end of the first filtering vertical partition plate 15 and the first top plate 17 is 5-10cm, the distance between the top end of the second filtering vertical partition plate 16 and the second top plate 18 is 3-8cm, and the height of the filtering vertical partition plate is smaller than that of the top plate of the ladder box, so that the water circulation can be accelerated while the filtering effect is ensured.

In a preferred embodiment of this embodiment, the first vertical filtering partition 15 is used for filtering large particles, undissolved metal oxides, broken hair, etc. in the domestic sewage, the first vertical filtering partition 15 is made of PP cotton/coarse filter screen, the PP cotton is made of polyester fiber, has a pre-purification effect, and filters colloidal impurities with a diameter greater than 5 μm in the domestic sewage; the second filtering vertical clapboard 16 is used for filtering small-particle-size particles, organic pollutants, colorimetric substances, heavy metal ions and the like in the domestic sewage, and the second filtering vertical clapboard 16 adopts a modified particle activated carbon plate, for example, an activated carbon filtering vertical clapboard is adopted, the activated carbon is a carbide with a developed surface micropore structure, the diameter of the micropore is 2-50nm, and acid and alkali substances in the domestic sewage are treated.

It can be understood that the first filter transverse plate arranged at the top of the second-stage box body 8 and the second filter transverse plate arranged at the third-stage box body 9 both adopt PP cotton and coarse filter screens, so that not only can coarse particle impurities be filtered, but also smooth normal circulation of water flow is ensured.

In a preferred embodiment of the present embodiment, a plurality of electric power extraction devices 5 are provided in the water tank 1, and the purification treatment effect is improved by providing a plurality of electric power extraction devices 5. Preferably, two geoelectricity extraction devices 5 are arranged in the water tank 1 with the ladder structure, and the two geoelectricity extraction devices 5 are respectively arranged in the second-stage tank body 8 and the third-stage tank body 9 and are positioned at two sides of the second filtering vertical partition plate 16. That is to say, first ground electricity extraction element sets up in second step box 8, and is located the second and filters the upstream of erecting baffle 16, and second ground electricity extraction element sets up in third step box 9, and first ground electricity extraction element's effective adsorption treatment area is greater than second ground electricity extraction element's effective adsorption treatment area, can guarantee the purification treatment effect of sewage cycle in-process.

In a preferred embodiment of the present embodiment, the sizes of the first water outlet 10, the second water outlet 11, and the third water outlet 12 are sequentially increased, the diameters of the three water outlets are 1:2:3, and due to the arrangement of the stepped water tank structure, potential energy difference exists in water in the tank body, and the diameters of the water outlets are differentially arranged, so that the drainage speed of the downstream water outlets is increased, and the filtration circulation speed is increased.

As shown in fig. 6, the bottom surface of the water tank 1 is a slope, which is beneficial to the downward sliding and gathering of the particulate matters and the flocs in the domestic sewage along the slope under the action of gravity, the slope of the slope is 5%, the bottom end of the slope is provided with a drain outlet 25, the drain outlet 25 is provided with a drain valve, the drain valve is opened after the device filters for a certain time, and the particulate matters and the flocs gathered are discharged through the drain outlet 25 under the action of gravity.

When the rural domestic sewage purification treatment device is implemented, all the water outlet valves/water outlets of the purification treatment device are closed firstly, the domestic sewage is connected through the water inlet pipe, the step-shaped water tank is filled with the domestic water to be treated, and the treatment device is powered on. The circulating water pump supplies power to work, the transformer rectifier works, and power is supplied for the earth electricity extraction device. Domestic sewage gets into the echelonment water tank, experiences the sediment in first step box, erects the baffle through first filtration and carries out the prefilter, filters coarse grain impurity, and the sewage after first step box is handled partly directly gets into the second step box, and another part sewage is through flowing out from first delivery port, gets into the second step box after first filtration diaphragm filters. In the second stage box, the organic matter of first geoelectricity extraction element in to domestic sewage adsorbs, and the second filters and erects the baffle and filters fine particle thing impurity, filters the sewage after erecting baffle purification treatment through the first geoelectricity extraction element in the second stage box and second, and partly direct entering third stage box, another part sewage is through flowing out from the second delivery port, filters the diaphragm through the second and enters into the third stage box. Sewage treated by the first two-stage box body enters the third stage box body, the second geoelectricity extraction device carries out adsorption purification treatment on the primarily treated life again, the sewage treated in the third stage box body flows out through the third water outlet, and enters the first stage box body again through the water return pipe and the water inlet pipe under the action of the circulating water pump, and the purification treatment process is repeated. Because the geoelectricity extraction device needs at least six hours of working time, the repeated treatment of the same batch of domestic sewage is completed through the work of the circulating water pump, so as to achieve the optimal domestic sewage treatment effect. After six hours of purification treatment, the purified sewage reaches the discharge standard, the purification treatment device is powered off, the circulating water pump and the electric extraction device stop working, a drain valve arranged at a purified water outlet is opened, and the purified domestic sewage is discharged.

Compared with the prior art, the rural domestic sewage purification treatment device that this embodiment provided, the electrolytic adsorption purification treatment is carried out to rural domestic sewage to the innovative adoption geoelectrochemical extraction technique, utilizes circulating water pump to make water tank, inlet tube and wet return constitute the circulation path simultaneously, provides sufficient operating time for geoelectricity extraction device, can effectively get rid of the organic matter in the domestic sewage, promotes the purification treatment effect. The water tank is set to be of a ladder-shaped structure, coarse particles are filtered and fine particles are filtered and are arranged in sequence along the water flow direction at different ladder box positions, the height of each step of box is reduced in sequence along the water flow direction, the side wall of the upper step of box is provided with a water outlet, the water outlet is arranged on the side wall of the junction of the two steps, the top plate of the next step is provided with a filtering transverse plate, the water outlet of the lowest step of box is communicated with the water inlet of the highest step of box through an external circulating water pump, so that water circulation within a certain time is realized, water flowing out from the water outlet of the upper step of box falls on the filtering transverse plate of the next step of box and enters the next step of box after being filtered by the filtering transverse plate, impurities are left on the filtering transverse plate, in the whole circulation process, sewage passes through the multi-stage filtering vertical baffle, the filtering transverse plate and the purification of the electric extraction device, and the purification effect is better.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.

Claims (10)

1. The utility model provides a rural domestic sewage purification unit which characterized in that includes:

the water circulation system comprises a water tank (1), wherein the water tank (1) is provided with a water inlet (13) and a water outlet, the water inlet (13) is connected with a water inlet pipe (2), the water outlet is connected with a water return pipe (3), the water inlet pipe (2) is connected with the water return pipe (3) through a circulation water pump (4), and the water tank (1), the water inlet pipe (2) and the water return pipe (3) form a circulation path;

the geoelectricity extraction device (5), the geoelectricity extraction device (5) is arranged in the water tank (1) and is used for adsorbing organic pollutants in domestic sewage;

the multi-stage filtering component is arranged in the water tank (1) and is used for physically filtering impurities in the domestic sewage.

2. The rural domestic sewage purification treatment device according to claim 1, wherein the water tank (1) is of a ladder structure and comprises at least two stages of tank bodies, and the height of each stage of tank body is reduced in sequence along the water flow direction;

in two adjacent step boxes, the lateral wall of the upper step box is provided with a water outlet, the top plate of the lower step box is of a hollow structure, and a filtering transverse plate is laid on the hollow structure.

3. The rural domestic sewage purification treatment device according to claim 2, wherein the water tank (1) comprises a first-stage tank body (7), a second-stage tank body (8) and a third-stage tank body (9);

a water inlet (13) of the water tank (1) is formed in the side wall of the first-stage tank body (7), and the height of the water inlet (13) is higher than that of a top plate of the second-stage tank body (8);

a first water outlet (10) is formed in the side wall of the first-stage box body (7), a second water outlet (11) is formed in the side wall of the second-stage box body (8), and a third water outlet (12) is formed in the side wall of the third-stage box body (9);

the third water outlet (12) is a water outlet of the water tank (1) and is connected with the water return pipe (3).

4. The rural domestic sewage purification treatment device according to claim 3, wherein the second-stage box body (8) is provided with a second top plate (18), the third-stage box body (9) is provided with a third top plate (19), and a first filtering transverse plate and a second filtering transverse plate are respectively paved on the second top plate (18) and the third top plate (19);

a first baffle plate (23) is arranged on the periphery of the second top plate (18), and the first baffle plate (23) is higher than the upper surface of the first filtering transverse plate;

and a second baffle (24) is arranged around the third top plate (19), and the second baffle (24) is higher than the upper surface of the second filtering transverse plate.

5. The rural domestic sewage purification treatment apparatus according to claim 4, wherein the multistage filtering assembly comprises a first filtering vertical partition plate (15) and a second filtering vertical partition plate (16), the first filtering vertical partition plate (15) is located upstream of the second filtering vertical partition plate (16);

the first vertical filtering partition plate (15) is used for filtering large-particle impurities in domestic sewage, and the second vertical filtering partition plate (16) is used for filtering small-particle-size particle impurities in the domestic sewage.

6. The rural domestic sewage purification treatment device according to claim 5, wherein the first vertical filtering partition (15) is arranged in the first stage tank body (7), and the second vertical filtering partition (16) is arranged in the second stage tank body (8);

the height of the first filtering vertical partition plate (15) is less than or equal to that of the first-stage box body (7), and the height of the second filtering vertical partition plate (16) is less than or equal to that of the second-stage box body (8).

7. The rural domestic sewage purification treatment device of claim 6, wherein the number of the geoelectric extraction devices (5) is two, and the two geoelectric extraction devices (5) are respectively arranged in the second-stage box body (8) and the third-stage box body (9) and are positioned at two sides of the second filtering vertical partition plate (16).

8. The rural domestic sewage purification treatment device according to any one of claims 1 to 7, wherein the electric extraction device (5) comprises an extraction electrode, the center of the extraction electrode is a graphite carbon rod (21), and the graphite carbon rod (21) is coated with an adsorption material.

9. The rural domestic sewage purification treatment device according to claim 8, wherein the bottom surface of the water tank (1) is a slope, the slope of the slope is 5%, a drain outlet (25) is arranged at the bottom end of the slope, and a drain valve is arranged on the drain outlet (25).

10. The rural domestic sewage purification treatment device according to claim 9, wherein the water tank (1) is further provided with a purified water outlet (14), and the purified water outlet (14) is provided with a drain valve.

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