CN104310717B - A kind of sanitary sewage recycling processing system up to standard and method that is applicable to northern country - Google Patents

Abstract

The invention relates to a treatment system for domestic sewage up to standard reuse in northern rural areas. It includes a sewage collection pretreatment pool and a sewage treatment unit. Each sewage treatment unit includes a sewage treatment pool, a water inlet pipe, a water distribution pipe and a plant purification pool. A filter packing layer is arranged in the filter chamber, and the filter packing layer from top to bottom is the first pebble layer, yellow sand layer, zeolite layer, and second pebble layer. The water distribution pipe is located in the first pebble layer, and the water distribution pipe passes through the water inlet pipe and the regulator The submersible pump in the pool is connected, and an insulation layer is arranged on the outer surface of the sewage collection pretreatment pool, the sewage treatment pool and the plant purification pool. It solves the problem of difficult overwintering of domestic sewage treatment projects in northern rural areas, and the effluent reaches the first-class A standard of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants". The effluent is reused, saving water resources, low system construction costs, low operating costs, and easy maintenance Simple, farmer-operable and built to last without backwashing.

Description

A treatment system and method for domestic sewage up to standard reuse in northern rural areas

technical field

The invention relates to a domestic sewage treatment system and method applicable to northern rural areas and belongs to the technical field of waste water treatment.

Background technique

In recent years, with the continuous development of the economy and the continuous increase of farmers' income, rural living facilities, living environment and consumption patterns have also undergone major changes. Equipment such as tap water pipe networks and sanitary showers have gradually entered the households of ordinary people, and domestic sewage discharge volume increased sharply. For a long time, due to the influence of economic development, environmental awareness and other reasons, most rural areas have no sewage collection and treatment system. Most of the domestic sewage is discharged into the ditch beside the house or the outdoor space and seeps into the ground, seriously polluting water, air and soil environment. At the same time, northern China is a water-scarce area. For example, the per capita water resources in Shandong Province are only 334 cubic meters, which is less than 1/6 of the national per capita share and only 1/25 of the world's per capita share. It ranks among the provinces in the country ( municipalities and autonomous regions) ranks third from the bottom. The per capita water resources in Hebei Province are only 307 cubic meters, which is less than 1/7 of the national average per capita. However, the discharge of a large amount of domestic sewage has caused an extreme waste of water resources. Therefore, it is an important task to strengthen the harmless treatment and reuse of rural sewage.

However, the traditional sewage treatment methods commonly used at present, such as ordinary activated sludge method, AO method, etc., have high construction costs and complicated operation and maintenance of treatment facilities, and are difficult to promote and use in rural areas with relatively poor economic conditions. Therefore, there is an urgent need for low-cost and high-quality Efficient rural domestic sewage treatment and reuse technology. Patent No. CN200910231119.9 discloses a single household sewage treatment method and device without power. A micro-dynamic sewage treatment system and method is mainly aimed at sewage treatment in centralized rural areas or communities, but this technology does not consider the problem of winter heat preservation, so it is not suitable for application in northern rural areas, and the effluent cannot meet the "Urban Sewage Treatment Plant Pollutant Discharge Standard" 》Class A standard cannot solve the problem of water shortage.

In view of the problems of low winter temperature and lack of water resources in northern rural areas, there are no reports on domestic sewage treatment systems and methods suitable for small and medium-sized rural areas in northern China.

Contents of the invention

In view of the low temperature in winter in the north, it is difficult for domestic sewage treatment projects to survive the winter; water resources are scarce, and the per capita water resources are small; the rural economic foundation is weak, and it is unable to afford domestic sewage treatment facilities with high construction costs and high operating costs; farmers have poor hands-on ability. The maintenance and use of complex facilities is unacceptable, and the present invention provides a domestic sewage treatment system and method suitable for the northern rural areas.

Technical scheme of the present invention is as follows:

A standard domestic sewage reuse treatment system suitable for northern rural areas, which includes a sewage collection pretreatment tank and a sewage treatment unit, characterized in that the sewage collection pretreatment tank is divided into a sump pool and a grit chamber by a partition And the regulating tank, the upper part of the side wall of the collecting tank is provided with an overflow port connected with the grit chamber, the supernatant liquid of the collecting tank flows into the grit chamber through the overflow port, the grit chamber is connected with the regulating tank through the communication hole, and the bottom of the regulating pond A submersible pump is provided, and the submersible pump supplies water to each sewage treatment unit through the pipeline;

Each sewage treatment unit includes a sewage treatment tank, a water inlet pipe, a water distribution pipe and a plant purification tank. The sewage treatment tank and the plant purification tank are arranged on the left and right. The sewage treatment tank includes an upper filter room and a lower collection room. Packing layer, the filter packing layer from top to bottom is the first pebble layer, yellow sand layer, zeolite layer, and second pebble layer. The upper surface of the first pebble layer is provided with an interlayer, and the interlayer is covered with a soil layer. , the soil layer is used for planting plants, the water distribution pipe is located in the first pebble layer, the water distribution pipe is connected with the submersible pump in the adjustment tank through the water inlet pipe, and the connecting pipe connecting the plant purification tank with the collection tank is connected at the bottom of the collection chamber. Plants are planted in the plant purification pool, and the bottom of the plant purification pool is provided with a water outlet. The outer surfaces of the pool, the sewage treatment pool and the plant purification pool are provided with insulation layers.

Preferably in the present invention, the grit chamber is a series structure of 1-2 grit chambers, each grit chamber includes a buffer chamber and a grit chamber, the buffer chamber communicates with the grit chamber, and the adjacent two grit chambers The buffer chambers are staggered, and the two adjacent grit chambers are connected through the communication holes on the side walls of the buffer chambers. Enter the buffer room of the next grit chamber through the grit chamber, and the side wall of the grit chamber of the last grit chamber is provided with an access hole that communicates with the regulating tank, and the supernatant of the sump pool flows through 1-2 grit chambers. The pool flows into the regulating pool through the access hole.

Preferably in the present invention, the thickness of the first pebble layer is 8-15cm, the average particle diameter of pebble is 2-4cm, the thickness of yellow sand layer is thickness 30-35cm, the average particle diameter of yellow sand is 0.3-1.5mm, the thickness of zeolite layer The average particle diameter of the zeolite is 2-3mm, the thickness of the second pebble layer is 10-15cm, and the average particle diameter of the pebble is 1-2cm.

The pebbles in the first pebble layer are used to support the water distribution pipe, so that the inlet water is evenly distributed on the filter material layer through the pipe, and at the same time, the filter material is prevented from blocking the water outlet hole of the water distribution pipe. Ordinary yellow sand layer, the function of yellow sand layer is to absorb and decompose organic matter and suspended matter in domestic sewage, such as COD, BOD, TSS. Zeolite layer, the function of zeolite layer is to adsorb and decompose ammonia nitrogen and phosphorus in domestic sewage. The second pebble layer is used to collect the effluent, so that it can be discharged or reused through the outlet pipe.

There are 4-6 sewage treatment units. The water distribution pipes include branch water distribution pipes. Vertical water distribution pipes perpendicular to the branch water distribution pipes are connected on both sides of the branch water distribution pipes. There are several vertical water distribution pipes. The vertical water distribution pipes are parallel to each other. The branch water distribution pipes of the vertical water distribution pipe are connected with each other, and water distribution holes are arranged on the vertical water distribution pipes.

According to the present invention, it is further preferred that the water distribution holes on adjacent vertical cleaning pipes are arranged alternately. The advantages of this design: the spray holes are evenly distributed, so that the water distribution range is wider, the area is larger, and there is no dead angle.

Preferably in the present invention, the inner diameter of the water distribution pipe is 20-40mm, the aperture of the water distribution hole is 5-8mm, the inner diameter of the water inlet pipe is 30-60mm, and the port of the water inlet pipe is connected with the submersible pump. -5.0mm.

Preferably in the present invention, the shape of the collection chamber is an inverted cone, the communication pipe is arranged at a distance of 2-5 cm from the bottom of the collection chamber, and the communication pipe is arranged perpendicular to the longitudinal axis of the collection chamber.

Preferably in the present invention, a vent pipe is arranged in the filter packing layer, the vent pipe vertically runs through the filter packing layer, the upper end is higher than the uppermost layer of the filter packing layer and passes through the soil layer, and vent holes are evenly distributed on the side walls of the vent pipe.

Preferably in the present invention, the thickness of the thermal insulation layer is 5-10cm, the thermal insulation layer is a polyurethane thermal insulation board, and the side wall of the plant purification pool away from the sewage treatment tank is a transparent side wall. On the side wall, the thermal insulation layer Hinged with transparent side walls.

Preferably in the present invention, the interlayer is a filter cloth layer, and the thickness of the soil layer is 40-50cm.

Preferably in the present invention, a solar panel is arranged on the upper port of the water collecting tank, the grit chamber, the regulating tank, the domestic sewage treatment tank and the plant purification tank for heat preservation, and there are two solar panels at the upper port of the domestic sewage treatment tank and the plant purification tank. Two solar panels are connected at an angle of 100-120° and arranged at the upper port of the domestic sewage treatment pool and the plant purification pool.

Preferably in the present invention, coiled pipes are arranged on the inner side walls of the sump, the grit chamber, the regulating tank and the plant purification pond, and the coiled pipes communicate with the solar energy. Heating is done by solar energy. When the temperature is too low in winter, the water collection tank, grit chamber, regulating tank and plant purification tank are heated through the coil.

Using the above-mentioned device to carry out the domestic sewage up to standard reuse treatment method, including the following steps:

(1) Rural domestic sewage is collected by the pipe network and then poured into the sump. The supernatant of the sump flows into the buffer chamber of the adjacent grit chamber through the overflow port, and flows from the buffer chamber through the grit chamber into the next grit chamber. In the buffer chamber, the connecting hole is set on the side wall of the grit chamber of the last grit chamber, and the supernatant of the sump pool flows through 1-2 grit chambers and flows into the regulating tank through the connecting hole;

(2) After entering the regulating tank, water is supplied to each sewage treatment unit through a submersible pump. The power of the submersible pump is 0.75kW, the flow rate is 8000L/h, and the head is 6m. The treated water enters the first water distribution pipe through branch water distribution pipes and vertical water distribution pipes. The pebble layer, after the further water distribution of the first pebble layer, the adsorption and decomposition of the yellow sand layer, the zeolite layer, and the second pebble layer, finally enters the collection room. The thickness of the first pebble layer is 8-15cm, and the average pebble The particle size is 2-4cm, the thickness of the yellow sand layer is 30-35cm, the average particle size of the yellow sand is 0.3-1.5mm, the thickness of the zeolite layer is 25-35cm, the average particle size of the zeolite is 2-3mm, the second pebble layer The thickness of the pebbles is 10-15cm, and the average particle size of the pebbles is 1-2cm;

(3) The water in the collection chamber enters the plant purification pool through the connecting pipe, and the plants in the plant purification pool further purify the water to remove ammonia nitrogen and phosphorus;

(4) The branch outlet pipes of each sewage treatment unit are connected to the water outlet main pipe, and the water treated by the sewage treatment tank and the plant purification tank finally enters the fish pond for fish farming or is reused for landscape water.

Preferably in the present invention, the plants in the plant purification pool are reeds and/or Spartina alterniflora.

The size of the above-mentioned water collection tank, grit chamber, pretreatment tank, domestic sewage treatment tank and plant purification tank is designed according to the amount of domestic sewage produced in rural areas, and those skilled in the art can implement this design according to common sense.

The system and method of the present invention are mainly aimed at domestic sewage in rural areas in the north, and have a good thermal insulation effect in winter, and the effluent reaches the first-level A standard of "Pollutant Discharge Standards for Urban Sewage Treatment Plants", and the system and method consume less energy, are simple to construct, and are easy to maintain and use , It can solve the pollution caused by the random discharge of rural sewage in the north, realize the normal operation of the domestic sewage treatment project in the north in winter, and reuse the effluent up to the standard, which saves water resources while reducing pollution.

The indicators of domestic sewage before treatment and after treatment by the treatment system of the present invention are as follows:

Technical characteristics and advantages of the present invention are as follows:

1. The system and method of the present invention are mainly aimed at purification and comprehensive treatment of domestic sewage in northern rural areas to achieve waste water recycling. The sewage treatment system of the present invention is applicable all year round, especially in northern winter, and has a good heat preservation effect, which solves the problem of domestic sewage in northern rural areas. Solve the problem that the project is difficult to survive the winter, so that the project can run normally throughout the year, the effluent water can meet the reuse standard, the energy consumption is small, the construction is simple, and the maintenance is convenient. In normal operation, the effluent water reaches the standard for reuse, which saves water resources while reducing pollution.

2. The present invention has a good treatment effect on domestic sewage, and the effluent reaches the first-class A standard of the "Pollutant Discharge Standard for Urban Sewage Treatment Plants", and the effluent is reused, saving water resources; the system and method of the present invention have a particularly obvious effect on nitrogen and phosphorus removal , The removal rate of nitrogen and phosphorus reaches 65-80%.

3. The system of the present invention has low construction cost, low operating cost, simple maintenance and use, and can be operated by farmers.

4. The system of the present invention has a simple structure and can be used for a long time without backwashing.

Description of drawings

Fig. 1 is the domestic sewage up to standard reuse treatment system applicable to northern rural areas of the present invention;

Fig. 2 is a structural schematic diagram of a local sewage treatment unit;

Fig. 3 is the structural representation of water distribution pipe;

Fig. 4 is the structural representation of water distribution hole;

Among them: 1. Collecting tank, 2. Grit chamber, 3. Buffer chamber, 4. Grit chamber, 5. Overflow port, 6. Connecting hole, 7. Adjusting tank, 8. Breeding tank, 9. Submersible pump, 10. Water inlet pipe, 11. Water distribution pipe, 12. Branch outlet pipe, 13. Outlet main pipe, 14. Sewage treatment tank, 15. The first pebble layer, 16. Yellow sand layer, 17. Zeolite layer, 18. The second layer Pebble layer, 19, soil layer, 20, insulation layer, 21, sunlight board, 22, water distribution hole, 23, connecting pipe, 24, plant purification pool, 25, insulation board on the transparent side wall of plant purification pool, 26, Branch water distribution pipes, 27 vertical water distribution pipes.

detailed description

The present invention will be described in detail below by means of embodiments and with reference to the accompanying drawings. It must be pointed out that the embodiments are only used to further illustrate the present invention, and cannot be interpreted as limiting the protection scope of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention according to the above-mentioned content of the present invention.

Example 1:

Domestic sewage treatment system and method applicable to rural areas with a population of 600 in Shandong

The daily domestic sewage production of 600 people is about 18t, and the COD, BOD, TSS, NH3-N and TP of domestic sewage are 520mg/L, 208mg/L, 182mg/L, 27.5mg/L, 6.4mg/L respectively, According to the amount of domestic sewage produced every day and the characteristics of domestic sewage, it is suitable for the domestic sewage standard reuse treatment system in northern rural areas. The structure is shown in Figure 1-Figure 4, including sewage collection pretreatment pool and sewage treatment unit. The sewage mentioned above The collection and pretreatment pool is divided into a sump ¹ , a grit chamber 2 and a regulating pool 7 by a partition. 2 The volume is 6m ³ , the size is length×width×height=2.0m×2.0m×1.5m; the volume of regulating tank 7 is 18m ³ , the size is length×width×height=6.0m×2.0m×1.5m; The upper part of the side wall of 1 is provided with an overflow port 5 communicating with the grit chamber 2, and the supernatant liquid of the sump 1 flows into the grit chamber 2 through the overflow port, and the grit chamber 2 is communicated with the regulating tank 7 through the communication hole 6, and the adjustment A submersible pump 9 is arranged at the bottom of the pool 7, and the submersible pump 9 supplies water to each sewage treatment unit through a pipeline; the grit chamber 2 is a series structure of two grit chambers, and each grit chamber includes a buffer chamber 3 and a grit chamber 4. The chamber 3 is connected with the grit chamber 4, and the buffer chambers 4 of the two adjacent grit chambers 2 are staggered, and the two adjacent grit chambers 2 are connected through the communication holes 6 on the side walls of the buffer chambers. The supernatant of pool layer 1 flows into the buffer chamber 3 of the adjacent grit chamber 2 through the overflow port, and flows from the buffer chamber 3 through the grit chamber 4 into the buffer chamber 3 of the next grit chamber, and the last grit chamber The side wall of the grit chamber 4 of 2 is provided with an access hole communicating with the adjustment tank 7, and the supernatant liquid of the sump pool flows through the two grit chambers and flows into the adjustment tank 7 through the access hole.

The sewage treatment unit is composed of 4 units, and each sewage treatment unit includes a sewage treatment tank 14, a water inlet pipe 10, a water distribution pipe 11 and a plant purification tank 24, and the size of the sewage treatment tank is length × width × height = 5.0m × 10.0m × 1.0 m; the volume of the plant purification pool 24 is 75m ³ , and the size is length×width×height=5.0m×5.0m×3.0m. The sewage treatment pool 14 and the plant purification pool 24 are arranged left and right. The sewage treatment pool 14 includes an upper filter chamber and a lower collection chamber, and a filter packing layer is arranged in the filter chamber. The filter packing layer is first from top to bottom. Pebble layer 15, yellow sand layer 16, zeolite layer 17, second pebble layer 18, the upper surface of the first pebble layer 15 is provided with interlayer, is covered with soil layer on the interlayer, and soil layer is used for planting plants, and water distribution pipe 11 is located at In the first pebble layer, the water distribution pipe 11 is connected with the submersible pump 9 in the regulating pool 7 through the water inlet pipe 10, and the connecting pipe 23 connecting the plant purification pool with the collection pool is connected at the bottom of the collection chamber, and planted in the plant purification pool. Plants, the bottom of the plant purification tank is provided with a water outlet, the water outlet is connected to the branch outlet pipe 12, the branch outlet pipe 12 of each sewage treatment unit is connected to the water outlet main pipe 13, and the water outlet main pipe 13 is connected to the culture pond 8, and the sewage collection pretreatment The outer surface of pond, sewage treatment pond 14 and plant purification pond 24 is provided with insulation layer 20, and the thickness of insulation layer is 5cm, and described insulation layer is polyurethane insulation board, and the side wall of plant purification pond away from sewage treatment pond is transparent side A wall on which the insulating layer is hinged to the transparent side wall. The shape of the collecting chamber is an inverted cone, and the connecting pipe 23 is arranged at a distance of 2 cm from the bottom of the collecting chamber, and the connecting pipe 23 is arranged perpendicular to the longitudinal axis of the collecting chamber. A vent pipe is arranged in the filter packing layer, the vent pipe vertically runs through the filter packing layer, the upper end is higher than the uppermost layer of the filter packing layer and passes through the soil layer, and vent holes are evenly distributed on the side walls of the vent pipe.

The thickness of the first pebble layer is 8cm, and the average particle diameter of pebble is 2cm, and the thickness of yellow sand layer is thickness 30cm, and the average particle diameter of yellow sand is 0.3mm, and the thickness of zeolite layer is 25cm, and the average particle diameter of the average particle diameter of zeolite is 2mm, the thickness of the second pebble layer is 10cm, and the average particle diameter of the pebble is 1cm. The interlayer is a filter cloth layer, and the thickness of the soil layer is 40cm.

The water distribution pipes include branch water distribution pipes 26, and the two sides of the branch water distribution pipes 26 are connected with vertical water distribution pipes 27 perpendicular to the branch water distribution pipes 26. The vertical water distribution pipes 27 are several, and the vertical water distribution pipes 27 are parallel to each other. 27 communicates with the branch water distribution pipe 26, and the vertical water distribution pipe 27 is provided with water distribution holes 22, and the water distribution holes 22 on the adjacent vertical cleaning pipes are staggered. The inner diameter of the branch water distribution pipe 26 is 20mm, the aperture of the water distribution hole is 5mm, the inner diameter of the water inlet pipe is 30mm, and the port of the water inlet pipe and the connection of the submersible pump are provided with a screen with a screen aperture of 3.0mm.

There are two solar panels on the upper ports of the sump tank, grit chamber, regulating tank, domestic sewage treatment tank and plant purification tank for heat preservation. The 120° included angle is connected and arranged at the upper port of the domestic sewage treatment pool and the plant purification pool.

Rural domestic sewage is collected by the pipe network and then flows into the sump, and then enters the grit chamber, where the sediment in the domestic sewage is removed after sedimentation, and then flows into the adjustment tank, and finally pumped into the domestic sewage treatment tank through the pump, and the water is discharged It is collected through the pebble layer at the bottom, and flows into the plant purification tank through the pipeline, and finally the effluent reaches the first-class A standard of the "Pollutant Discharge Standard for Urban Sewage Treatment Plants", and enters the fish pond for fish farming.

Example 2: A domestic sewage treatment system and method suitable for 600-population rural areas in Ningxia

As described in Example 1, the domestic sewage up-to-standard reuse treatment system applicable to rural areas in the north is different in that:

The thickness of insulation layer is 8cm, and connecting pipe 23 is arranged at the place apart from collection room bottom 3cm, and the thickness of the first pebble layer is 12cm, and the average particle diameter of pebble is 3cm, and the thickness of yellow sand layer is thickness 32cm, and the average particle diameter of yellow sand is 0.8cm. mm, the thickness of the zeolite layer is 30cm, the average particle diameter of the average particle diameter of the zeolite is 2.5mm, the thickness of the second pebble layer is 12cm, and the average particle diameter of the pebble is 1.5cm. The interlayer is a filter cloth layer, and the thickness of the soil layer is 45cm.

There are two solar panels at the upper port of the domestic sewage treatment pool and the plant purification pool, and the two solar panels are connected at an angle of 100° and arranged on the upper ports of the domestic sewage treatment pool and the plant purification pool.

Example 3: A domestic sewage treatment system and method suitable for 600-population rural areas in Liaoning

As described in Example 1, the domestic sewage up-to-standard reuse treatment system applicable to rural areas in the north is different in that:

The thickness of insulation layer is 10cm, and connecting pipe 23 is arranged at 5cm from the bottom of collection chamber, the thickness of the first pebble layer is 15cm, and the average particle diameter of pebble is 4cm, and the thickness of yellow sand layer is thickness 35cm, and the average particle diameter of yellow sand is 1.2cm. mm, the thickness of the zeolite layer is 35cm, the average particle diameter of the average particle diameter of the zeolite is 3mm, the thickness of the second pebble layer is 15cm, and the average particle diameter of the pebble is 2cm. The interlayer is a filter cloth layer, and the thickness of the soil layer is 50cm.

There are two solar panels at the upper port of the domestic sewage treatment pool and the plant purification pool, and the two solar panels are connected at an angle of 110° and arranged on the upper ports of the domestic sewage treatment pool and the plant purification pool. Coil pipes are arranged on the inner side walls of the sump, the grit chamber, the regulating pond and the plant purification pond, and the coil pipes are connected with solar energy.

Example 4

The domestic sewage up-to-standard reuse treatment system applicable to northern rural areas described in Example 1 is used to carry out the domestic sewage up-to-standard reuse treatment method, including the following steps:

(1) Rural domestic sewage is collected by the pipe network and then poured into the sump. The supernatant of the sump flows into the buffer chamber of the adjacent grit chamber through the overflow port, and flows from the buffer chamber through the grit chamber into the next grit chamber. In the buffer chamber, the connecting hole is set on the side wall of the grit chamber of the last grit chamber, and the supernatant of the sump pool flows through the two grit chambers and flows into the regulating tank through the connecting hole;

(2) After entering the regulating tank, water is supplied to each sewage treatment unit through a submersible pump. The power of the submersible pump is 0.75kW, the flow rate is 8000L/h, and the head is 6m. The treated water enters the first water distribution pipe through branch water distribution pipes and vertical water distribution pipes. The pebble layer, after the further water distribution of the first pebble layer, the adsorption and decomposition of the yellow sand layer, the zeolite layer, and the second pebble layer, finally enters the collection room,

(3) The collection room enters the plant purification pool through the connecting pipe, and the plants in the plant purification pool further purify the water to remove ammonia nitrogen and phosphorus;

(4) The branch outlet pipes of each sewage treatment unit are connected to the water outlet main pipe. The water treated in the sewage treatment tank and the plant purification tank finally enters the fish pond for fish farming or is reused for landscape water. The plants in the plant purification tank are reeds and Flower Spartina.

Claims (9)

1. A domestic sewage up-to-standard reuse treatment system applicable to rural areas in the north, which comprises a sewage collection pretreatment tank and a sewage treatment unit, is characterized in that the sewage collection pretreatment tank is separated into a sump, a sedimentation tank by a partition The sand tank and the regulating tank, the upper part of the side wall of the collecting tank is provided with an overflow port connected with the grit chamber, the supernatant liquid of the collecting tank flows into the grit chamber through the overflow port, and the grit chamber is connected with the regulating tank through the communication hole, and the adjustment There is a submersible pump at the bottom of the pool, and the submersible pump supplies water to each sewage treatment unit through the pipeline; Each sewage treatment unit includes a sewage treatment tank, a water inlet pipe, a water distribution pipe and a plant purification tank. The sewage treatment tank and the plant purification tank are arranged on the left and right. The sewage treatment tank includes an upper filter room and a lower collection room. Packing layer, the filter packing layer from top to bottom is the first pebble layer, yellow sand layer, zeolite layer, and second pebble layer. The upper surface of the first pebble layer is provided with an interlayer, and the interlayer is covered with a soil layer. , the soil layer is used for planting plants, the water distribution pipe is located in the first pebble layer, the water distribution pipe is connected with the submersible pump in the adjustment tank through the water inlet pipe, and the connecting pipe connecting the plant purification tank with the collection tank is connected at the bottom of the collection chamber. Plants are planted in the plant purification pool, and the bottom of the plant purification pool is provided with a water outlet. The outer surface of the tank, sewage treatment tank and plant purification tank is provided with an insulation layer; the grit chamber is a series structure of 1-2 grit chambers, and each grit chamber includes a buffer chamber and a grit chamber, and the buffer chamber and the grit chamber The buffer chambers of two adjacent grit chambers are staggered, and the two adjacent grit chambers are connected through the communication holes on the side walls of the buffer chambers, and the supernatant of the sump flows into the adjacent chamber through the overflow port. In the buffer chamber of the first grit chamber, the buffer chamber flows through the grit chamber into the buffer chamber of the next grit chamber, and the side wall of the grit chamber of the last grit chamber is provided with an access hole that communicates with the adjustment tank. The supernatant liquid of the pool flows through 1-2 grit chambers and flows into the regulating pool through the access hole. 2. The domestic sewage up-to-standard reuse treatment system suitable for northern rural areas according to claim 1 is characterized in that the thickness of the first pebble layer is 8-15cm, the average particle diameter of pebbles is 2-4cm, and the thickness of the yellow sand layer Thickness is thickness 30-35cm, and the average particle diameter of yellow sand is 0.3-1.5mm, and the thickness of zeolite layer is 25-35cm, and the average particle diameter of the average particle diameter of zeolite is 2-3mm, and the thickness of the second pebble layer is 10-15cm, The average particle size of pebbles is 1-2cm. 3. The domestic sewage up-to-standard reuse treatment system suitable for northern rural areas according to claim 1, characterized in that the water distribution pipes include branch water distribution pipes, and vertical distribution pipes perpendicular to the branch water distribution pipes are connected to both sides of the branch water distribution pipes. Water pipes, the vertical water distribution pipes are several, the vertical water distribution pipes are parallel to each other, the vertical water distribution pipes are connected with the branch water distribution pipes, and water distribution holes are arranged on the vertical water distribution pipes. 4. The domestic sewage standard reuse treatment system suitable for northern rural areas according to claim 3, characterized in that the water distribution holes on the adjacent vertical water distribution pipes are arranged alternately, the inner diameter of the water distribution pipes is 20-40mm, and the water distribution holes The aperture of the water inlet pipe is 5-8mm, the inner diameter of the water inlet pipe is 30-60mm, and a screen is installed at the connection between the port of the water inlet pipe and the submersible pump, and the aperture of the screen mesh is 3.0-5.0mm. 5. The domestic sewage standard reuse treatment system suitable for northern rural areas according to claim 1, characterized in that, the shape of the collection chamber is an inverted cone, and the connecting pipe is arranged at a distance of 2-5 cm from the bottom of the collection chamber , the connecting pipe is arranged perpendicular to the longitudinal axis of the collection chamber, and a vent pipe is arranged in the filter packing layer, the vent pipe runs through the filter packing layer vertically, the upper end is higher than the uppermost layer of the filter packing layer and passes through the soil layer, the side wall of the vent pipe Ventilation holes are evenly distributed on the top. 6. The domestic sewage up-to-standard reuse treatment system suitable for northern rural areas according to claim 1, characterized in that, the thickness of the insulation layer is 5-10cm, the insulation layer is a polyurethane insulation board, and the plant purifies The side wall of the pool away from the sewage treatment pool is a transparent side wall, and on the side wall, the thermal insulation layer is hinged with the transparent side wall. 7. The domestic sewage up-to-standard reuse treatment system suitable for northern rural areas according to claim 1, characterized in that, the interlayer is a filter cloth layer, and the thickness of the soil layer is 40-50cm. The upper port of the sand tank, the regulating tank, the sewage treatment tank and the plant purification tank is equipped with a sun board for heat preservation. There are two sun boards at the upper port of the sewage treatment tank and the plant purification tank, and the two sun boards are connected at an angle of 100-120° It is also installed at the upper port of the sewage treatment pool and the plant purification pool. 8. The domestic sewage standard reuse treatment system suitable for northern rural areas according to claim 1, characterized in that coils are arranged on the inner side walls of sump tanks, grit chambers, regulating tanks and plant purification tanks. The tube communicates with solar energy. 9. Utilize the treatment system described in claim 1 to carry out the domestic sewage up to standard reuse treatment method, comprising the following steps: (1) Rural domestic sewage is collected by the pipe network and then poured into the sump. The supernatant of the sump flows into the buffer chamber of the adjacent grit chamber through the overflow port, and flows from the buffer chamber through the grit chamber into the next grit chamber. In the buffer chamber, the connecting hole is set on the side wall of the grit chamber of the last grit chamber, and the supernatant of the sump pool flows through 1-2 grit chambers and flows into the regulating tank through the connecting hole; (2) After entering the regulating tank, water is supplied to each sewage treatment unit through the submersible pump. The power of the submersible pump is 0.75kW, the flow rate is 8000L/h, and the head is 6m. The treated water enters the first water distribution pipe through branch water distribution pipes and vertical water distribution pipes. The pebble layer, after the further water distribution of the first pebble layer, the adsorption and decomposition of the yellow sand layer, the zeolite layer, and the second pebble layer, finally enters the collection room. The thickness of the first pebble layer is 8-15cm, and the average pebble The particle size is 2-4cm, the thickness of the yellow sand layer is 30-35cm, the average particle size of the yellow sand is 0.3-1.5mm, the thickness of the zeolite layer is 25-35cm, the average particle size of the zeolite is 2-3mm, the second pebble layer The thickness of the pebbles is 10-15cm, and the average particle size of the pebbles is 1-2cm; (3) The water in the collection chamber enters the plant purification pool through the connecting pipe, and the plants in the plant purification pool further purify the water to remove ammonia nitrogen and phosphorus; (4) The branch outlet pipes of each sewage treatment unit are connected to the water outlet main pipe. The water treated by the sewage treatment tank and the plant purification tank finally enters the fish pond for fish farming or is reused for landscape water. The plants in the plant purification tank are reeds and / or Spartina alterniflora.