CN112723664B

CN112723664B - Biological and ecological combined sewage treatment system and sewage treatment method

Info

Publication number: CN112723664B
Application number: CN202011485815.5A
Authority: CN
Inventors: 邓景山; 苑莹莹; 张亚琼; 于江川; 王秋菊; 李承岳
Original assignee: Shijiazhuang Yuanshengyuan Environmental Co ltd
Current assignee: Shijiazhuang Yuanshengyuan Environmental Co ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2022-09-02
Anticipated expiration: 2040-12-16
Also published as: CN112723664A

Abstract

The invention relates to a biological and ecological combined sewage treatment system and a sewage treatment method, wherein the biological and ecological combined sewage treatment system comprises a septic tank, a pretreatment tank, a biological treatment tank and an ecological treatment device which are sequentially arranged according to the sewage flow direction and are sequentially communicated through a sewage pipeline, a sewage main inlet is arranged on the septic tank, the biological treatment tank comprises an ecological base oxidation tank and a spherical ecological base rapid filter tank which are sequentially arranged according to the sewage flow direction, a first ecological base is arranged in the ecological base oxidation tank, a second ecological base is arranged in the spherical ecological base rapid filter tank, and a purified water drain pipe is arranged on the ecological treatment device; the ecological treatment device comprises at least 1 general oxygen pond, wherein each general oxygen pond comprises a pond body, a medium layer and aquatic plants, the pond body is provided with a first impermeable layer on the inner surface, the medium layer is arranged in the pond body, and the aquatic plants are arranged on the medium layer; the invention realizes the resource recycling of the sewage.

Description

Biological and ecological combined sewage treatment system and sewage treatment method

Technical Field

The invention belongs to the field of sewage treatment, and particularly relates to a biological and ecological combined sewage treatment system and a sewage treatment method.

Background

With the rapid development of rural economy, the discharge amount of rural domestic sewage is increased, so that the environmental condition of rural areas is increasingly worsened, the quality of the rural environment is obviously reduced, the living environment and the body health of vast farmers are directly threatened, the healthy development of rural economy is restricted, and the rural environmental condition is worried. 96% of villages in China do not have drainage channels and sewage treatment systems, and production and domestic sewage is discharged at will. 89% villages stack garbage in the front and back of houses, beside pits and roads, even in water source areas, spillways, ponds and outside villages, no one is responsible for garbage collection and treatment, and the garbage enters natural water or enters underground water through rainwater, so that the local water environment is polluted.

Rural sewage treatment is characterized by low treatment rate, intermittent discharge, small discharge amount and dispersion, high nitrogen and phosphorus concentration and large amount of nutrient salt, bacteria, virus and the like, which bring certain difficulty to the collection and treatment of rural sewage.

At present, the treatment technologies for rural domestic sewage treatment applied at home and abroad are more, and the treatment technologies can be generally classified into two types from the process principle: the first is a natural treatment system, which utilizes the principles of soil filtration, plant absorption and microbial decomposition, also called ecological treatment system, and commonly used are: artificial wetland treatment systems, underground soil infiltration and purification systems and the like; the second type is a biological treatment system, which can be divided into aerobic biological treatment and anaerobic biological treatment, wherein the aerobic biological treatment is to oxygenate sewage by power, culture microbial strains, decompose, consume and absorb organic matters, nitrogen and phosphorus in the sewage by the microbial strains, and the common methods are as follows: a general activated sludge method, an ao method, a biological rotating disk, an sbr method, and the like; anaerobic biological treatment is a metabolic process using anaerobic microorganisms to convert organic pollutants into inorganic substances and small amounts of cellular materials without supplying oxygen, and is commonly used as follows: anaerobic contact method, anaerobic filter, uasb up-flow anaerobic sludge bed, etc.

When the technology is used for treating rural sewage which is dispersedly discharged, the following main technologies exist: on one hand, the biological treatment efficiency is low, particularly the nitrogen and phosphorus removal rate is very low, on the other hand, the existing dispersed sewage treatment only realizes the collection, treatment and discharge of the dispersed sewage preliminarily, and the true purpose of the dispersed treatment, namely Reuse (Reuse), is not realized, namely the sewage is treated on site and recycled on site, so that the sewage is recycled.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a biological and ecological combined sewage treatment system and a sewage treatment method, which realize the resource recycling of sewage.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the technical scheme I is as follows:

a biological and ecological combined sewage treatment system comprises a septic tank, a pretreatment tank, a biological treatment tank and an ecological treatment device, wherein the septic tank, the pretreatment tank, the biological treatment tank and the ecological treatment device are sequentially arranged according to a sewage flow direction and are sequentially communicated through a sewage pipeline; the ecological treatment device comprises at least 1 general oxygen pond, wherein the general oxygen pond comprises a pond body, a medium layer and aquatic plants, the pond body is provided with a first impermeable layer on the inner surface, the medium layer is arranged in the pond body, and the aquatic plants are arranged on the medium layer.

Furthermore, the biological treatment pond includes the biological pond body, set up in this internal cavity baffle of biological pond, ecological base oxidation pond and spherical ecological base fast filtering pond by independent cell body is separated into to the cavity baffle, the cavity baffle is close to the lateral wall of ecological base oxidation pond one end and has seted up the inside first overflow mouth of intercommunication ecological base oxidation pond and hollow baffle on upper portion, the lateral wall that the cavity baffle is close to spherical ecological base fast filtering pond one end has seted up the inside and spherical ecological base fast filtering pond second overflow mouth of intercommunication cavity baffle in lower part or bottom.

Further, a filtering grid is arranged at the bottom of the pretreatment tank;

the septic tank includes the septic tank body, set up in 3 baffles have set gradually according to the sewage flow direction in the septic tank body, all are provided with the third on 3 baffles and flow over the mouth, and the third that is located on the baffle of both sides overflows the mouth and sets up in the upper portion of corresponding baffle, and the third that is located on the baffle in the middle overflows the mouth and sets up in the lower part of corresponding baffle.

Furthermore, a first aeration device is further arranged in the flood oxygen pond, a second aeration device is arranged in the ecological oxidation pond, and the first aeration device and the second aeration device are communicated with an aeration main pipe through corresponding aeration branch pipes.

Furthermore, the number of the pan-oxidation ponds is two, the first pan-oxidation pond is arranged at the upstream of the pan-oxidation pond according to the sewage flow direction, and the second pan-oxidation pond is arranged at the downstream of the pan-oxidation pond;

the purified water drain pipe is arranged on the second pan-oxidation pond;

the bottom of first general oxygen pond is provided with circular mouth that leaks, the below of leaking the mouth is provided with the hydroecium, the internal surface of hydroecium is provided with the second barrier layer, one side of hydroecium is provided with the outlet pipe, the upper portion of hydroecium is provided with the backup pad, be provided with a plurality of holes that leak in the backup pad, the backup pad with be provided with the water filtering layer between the dielectric layer, be provided with in the hydroecium and clear soil anti-blocking device, clear soil anti-blocking device including rotate set up in the soil shifting wheel of the below of backup pad, set up in push away the material spiral of soil shifting wheel one side, push away the material spiral with the soil shifting wheel meshing is connected.

Furthermore, the pushing spiral comprises a pushing rotating shaft and a spiral plate arranged on the pushing rotating shaft, one end of the pushing rotating shaft is arranged in the water outlet pipe, the other end of the pushing rotating shaft penetrates through the water leakage chamber and then is provided with a motor, and the pushing rotating shaft is in transmission connection with a rotating output shaft of the motor;

the soil shifting wheel comprises a soil shifting rotating shaft, an annular boss, a plurality of soil shifting rods and helical teeth, wherein the soil shifting rotating shaft is rotatably arranged on the supporting plate and the bottom wall of the water filtering chamber, the annular boss is fixedly arranged at the lower part of the soil shifting rotating shaft, the soil shifting rods are circumferentially arranged on the outer annular wall of the annular boss and are eccentrically arranged, and the helical teeth are arranged at the outer side ends of the soil shifting rods and are meshed with the helical plates.

Furthermore, a conical boss is arranged above the annular boss, the outer diameter of the top of the conical boss is equal to that of the soil stirring rotating shaft, and the outer diameter of the bottom of the conical boss is equal to that of the annular boss;

soil clearing rods are arranged above the soil shifting wheels, and cleaning brushes are arranged on the upper surfaces of the soil clearing rods.

Furthermore, a sewage disinfection device is arranged between the spherical ecological base rapid filter tank and the ecological treatment tank.

The second technical scheme is as follows:

a biological and ecological combined sewage treatment method comprises the following steps:

step 1, septic tank treatment: sewage enters the septic tank, and macromolecular organic matters are partially hydrolyzed under the anaerobic condition of the septic tank, so that the COD of effluent is reduced;

step 2, pretreatment pool treatment: intercepting large-particle sediment numbers and suspended matters in the sewage treated by the septic tank by a filtering grid in the pretreatment tank;

step 3, ecological base oxidation pond treatment: enabling the sewage treated by the pretreatment tank to enter an ecological base oxidation tank, staying for 5-8 hours in the ecological base oxidation tank, keeping the dissolved oxygen content at 2.0-3.5 mg/L, and oxidizing and decomposing organic matters into inorganic matters by microorganisms in the ecological base oxidation tank under the aerobic condition to remove COD (chemical oxygen demand) in the sewage;

step 4, treating the spherical ecological base quick filter tank: the sewage treated by the ecological base oxidation tank enters a spherical ecological base fast filter tank, nitrite nitrogen and nitrate nitrogen in facultative anaerobic bacteria mixed liquor in the ecological base oxidation tank are reduced into nitrogen and released into the air under the anoxic condition, and ammonia nitrogen in the sewage is removed;

step 5, treating a pan-oxygen pond: and (3) disinfecting the sewage treated by the spherical ecological base rapid filter tank, then feeding the sewage into a second general oxidation pond, temporarily storing the sewage in the second general oxidation pond, degrading phosphorus in the sewage by using aquatic plants in the second general oxidation pond, and then discharging the sewage through a purified water discharge pipe.

Further, in the step 5, before entering the second pan-oxidation pond after being disinfected, the sewage also needs to enter the first pan-oxidation pond, and after phosphorus in the sewage is degraded by using aquatic plants in the second pan-oxidation pond, the sewage is discharged into the second pan-oxidation pond.

The third technical scheme is as follows:

an application of the biological and ecological combined sewage treatment system in rural sewage treatment.

Compared with the prior art, the invention has the beneficial effects that:

aiming at the pollution characteristics of the current rural water body, the invention analyzes the advantages and the disadvantages of the existing rural sewage treatment technology, applies the ecological microbiology principle and the aquatic ecology principle, develops a set of integrated treatment system which combines a flood oxygen pond and an ecological base technology and is specially applied to rural sewage treatment, can realize the purposes of standard discharge, stable operation, low cost, simple management, energy saving and environmental protection after implementation, can combine the agriculture and the natural topography of different village local areas, fully utilizes lakes, ponds, depressions and idle water surfaces to construct the flood oxygen pond, solves the problems of low rural sewage treatment efficiency, small discharge capacity and dispersion, forms a local sewage reuse and reutilization mode, and realizes the harmless and resource utilization of the rural sewage; in addition, the invention is also suitable for the fields of urban (including town building) sewage treatment, rural concentrated residential area sewage treatment, river flow (including lake) water environment restoration and the like. After being treated by the oxygen pond unit, the effluent quality can reach the IV-class water standard of the quality standard of surface water environment (GB3838-2002), and the effluent can be stable and long-acting. The invention has the following beneficial effects:

1. the sludge after the front-end biological treatment is delivered to the pan-oxidation pond along with the water flow, and can be used as organic fertilizer for the plants in the pan-oxidation pond to absorb and utilize, thereby realizing zero sludge discharge.

2. The pan-oxygen pond can be constructed by utilizing waste pits, fish ponds and the like, and the construction cost is low.

3. The invention combines the ecological base technology and the pan-oxidation pond technology, has complementary advantages, saves land occupation and realizes resource recycling.

Drawings

FIG. 1 is a schematic structural diagram of one embodiment of the present invention;

FIG. 2 is a schematic structural diagram of another embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along A-A of FIG. 2;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;

FIG. 5 is a perspective view of an earth-removing anti-clogging device in accordance with an embodiment of the present invention;

in the figure: 1. the system comprises a sewage pipeline, a septic tank, a pretreatment tank, a sewage inlet, an ecological base oxidation tank, a spherical ecological base rapid filter, a first ecological base, a second ecological base, a water purification drain pipe, a sewage pipeline, a sewage inlet, a sewage outlet, a sewage pipeline, a septic tank, a pretreatment tank, a sewage inlet, a spherical ecological base oxidation tank, a spherical ecological base rapid filter, a first ecological base, a second ecological base, a sewage outlet, a second ecological base, a spherical ecological base oxidation tank, a spherical ecological base and a second ecological base, 9, and a sewage outlet; 10. the device comprises a first general oxygen pond 11, a second general oxygen pond 12, a first impermeable layer 13, a pond body 14, a medium layer 15, aquatic plants 16, a suspension pipe 17 and an adsorption strip; 18. the biological pond comprises a biological pond body 19, a hollow partition plate 20, a first overflowing port 21, a second overflowing port 22 and a filtering grid; 23. the septic tank comprises a septic tank body, 24 parts of a partition plate, 25 parts of a third flow passing port, 26 parts of a first aeration device, 27 parts of a second aeration device, 28 parts of an aeration branch pipe, 29 parts of an aeration main pipe, 30 parts of a blower, 31 parts of a water leakage chamber, 32 parts of a second impermeable layer, 33 parts of a water outlet pipe, 34 parts of a support plate, 35 parts of a water leakage hole, 36 parts of a water filtering layer, 37 parts of a soil shifting wheel, 38 parts of a material pushing spiral, 39 parts of a material pushing rotary shaft, 40 parts of a spiral plate, 41 parts of a motor, 42 parts of a soil shifting rotary shaft, 43 parts of an annular boss, 44 parts of a soil shifting rod, 45 parts of an inclined tooth, 46 parts of a conical boss, 47 parts of a soil cleaning rod, 48 parts of a cleaning brush, 49 parts of a support, 50 parts of aquatic animals, 51 parts of a sewage disinfection device.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

The present invention will be described in further detail with reference to the accompanying drawings.

The biological and ecological combined sewage treatment system shown in the figure 1 is used for rural sewage treatment and comprises a septic tank 2, a pretreatment tank 3, a biological treatment tank and an ecological treatment device which are sequentially arranged according to the sewage flow direction and are sequentially communicated through a sewage pipeline 1, wherein a sewage main inlet 4 is formed in the septic tank 2, the biological treatment tank comprises an ecological base oxidation tank 5 and a spherical ecological base rapid filter tank 6 which are sequentially arranged according to the sewage flow direction, a first ecological base 7 is arranged in the ecological base oxidation tank 5, a second ecological base 8 is arranged in the spherical ecological base rapid filter tank 6, and a purified water drain pipe 9 is arranged on the ecological treatment device; the ecological treatment device comprises at least 1 oxygen pond, wherein the oxygen pond comprises a pond body 13, a medium layer 14 and aquatic plants 15, the pond body 13 is provided with a first impermeable layer 12 on the inner surface, the medium layer 14 is arranged in the pond body 13, and the aquatic plants 15 are arranged on the medium layer 14. After the sludge in the biological treatment tank is conveyed to the oxygen-flooding pond along with the water flow, the sludge can be used as an organic fertilizer for plants in the pond to absorb and utilize, zero sludge discharge is realized, the purified sewage can be recycled as a reclaimed water resource, the aquatic plants 15 and aquatic products can also be recycled as resources, the combination of sewage treatment and utilization is realized, and the combination of sewage treatment and landscape is realized.

Further, the dielectric layer 14 is formed by mixing planting soil and a phosphorus removal adsorbent according to a ratio of 1000-10000: 1 is prepared by compounding. According to the invention, aquatic crops can be planted in the pond body 13, aquatic animals 50 can be cultured, green planting and landscape stone decoration can be carried out on the periphery of the aeration pond, an artificial ecosystem and pleasant landscape are formed, in addition, the inner surface of the pond body is subjected to anti-seepage treatment, partial planting soil is supplemented, and a high-efficiency and environment-friendly phosphorus removal adsorbent is added into the planting soil, so that the over-standard phosphorus is adsorbed and temporarily stored under the condition that the phosphorus content in water is unstable, and then the phosphorus is slowly absorbed and consumed by the roots of the aquatic plants 15. The sewage treatment effect of the pan-oxygen pond is improved.

Furthermore, the phosphorus removal adsorbent comprises one or more of modified bentonite, fly ash, steel slag, zeolite, attapulgite, sepiolite and activated alumina, wherein the modified bentonite is preferably adopted.

Further, the first ecological base 7 adopts a float-type ecological base, and the float-type ecological base comprises an upper suspension pipe 16, a lower suspension pipe 16 and a plurality of adsorption strips 17 which are connected with the upper suspension pipe 16 and the lower suspension pipe 16;

the second ecological base 8 adopts a spherical free body ecological base which comprises a spherical shell and biological filler arranged in the spherical shell.

As an embodiment of the biological and ecological combined sewage treatment system, a sewage disinfection device 51 is further arranged between the spherical ecological base rapid filter 6 and the ecological treatment tank.

Further, the sewage sterilizer 51 is an ozone sterilizer or an ultraviolet sterilizer.

As an embodiment of the bio-ecological combined sewage treatment system of the present invention, the bio-ecological treatment tank includes a biological tank body 18, a hollow partition plate 19 disposed in the biological tank body 18, the ecological base oxidation tank 5 and the spherical ecological base rapid filter 6 are separated into independent tank bodies by the hollow partition plate 19, a first overflow port 20 communicating the ecological base oxidation tank 5 and the hollow partition plate 19 is disposed at an upper portion of a side wall of the hollow partition plate 19 near one end of the ecological base oxidation tank 5, and a second overflow port 21 communicating the hollow partition plate 19 and the spherical ecological base rapid filter 6 is disposed at a lower portion or a bottom portion of the side wall of the hollow partition plate 19 near one end of the spherical ecological base rapid filter 6.

As an embodiment of a biological and ecological combined sewage treatment system of the present invention, the bottom of the pretreatment tank 3 is provided with a filter grid 22;

the septic tank 2 comprises a

septic tank body

23, 3 partition plates 24 are sequentially arranged in the septic tank body 23 according to sewage flow direction, third overflowing ports 25 are arranged on the 3 partition plates 24, the third overflowing ports 25 on the partition plates 24 on two sides are arranged on the upper portions of the corresponding partition plates, and the third overflowing ports 25 on the partition plates 24 in the middle are arranged on the lower portions of the corresponding partition plates.

As an embodiment of the invention, the biological and ecological combined sewage treatment system is also provided with a first aeration device 26 in the flood pond, a second aeration device 27 in the ecological-based oxidation pond 5, and the first aeration device 26 and the second aeration device 27 are communicated with a blower 30 through corresponding aeration branch pipes 28 and main aeration pipes 29.

Further, aquatic animals 50 are also arranged on the medium layer 14 in the pan-oxidation pond. The pan-oxidation pond takes solar energy as an initial energy source, is assisted by an oxygen aeration technology, and forms a plurality of food chains by fungi, algae, aquatic plants 15 and aquatic animals 50 in the pond, so that a food net is formed, and organic matters in sewage are removed in the material migration and conversion, the step-by-step energy transfer and the conversion of the plurality of food chains in the pond.

As an example of a bio-ecological combined sewage treatment system of the present invention, as shown in fig. 2, there are two pan lagoons, and disposed upstream in the sewage flow direction is a first pan lagoon 10, and disposed downstream is a second pan lagoon 11; when the number of the flooding oxygen ponds is 2, the first flooding oxygen pond 10 is used for purifying sewage, and the second flooding oxygen pond 11 is used for temporarily storing purified water, so that the deterioration of water can be avoided.

Further, the purified water discharge pipe 9 is arranged on the second pan-oxidation pond 11;

as shown in fig. 3 to 5, a circular water leakage port is arranged at the bottom of the first general oxidation pond 10, a water leakage chamber 31 is arranged below the water leakage port, a second impermeable layer 32 is arranged on the inner surface of the water leakage chamber 31, a water outlet pipe 33 is arranged on one side of the water leakage chamber 31, a support plate 34 is arranged on the upper portion of the water leakage chamber 31, a plurality of water leakage holes 35 are arranged on the support plate 34, a water filtering layer 36 is arranged between the support plate 34 and the medium layer 14, a soil cleaning and blocking prevention device is arranged in the water leakage chamber 31, the soil cleaning and blocking prevention device comprises a soil shifting wheel 37 rotatably arranged below the support plate 34, a material pushing screw 38 arranged on one side of the soil shifting wheel 37, and the material pushing screw 38 is engaged with the soil shifting wheel 37.

A bracket 49 is further arranged in the water leakage chamber 31, and the support plate 34 is arranged on the bracket 49. And a position of the bracket 49 corresponding to the pushing spiral 38 is provided with a position-giving notch.

Further, the water filtration layer 36 is a gravel layer.

Further, the pushing screw 38 comprises a pushing rotating shaft 39 and a screw plate 40 arranged on the pushing rotating shaft 39, one end of the pushing rotating shaft 39 is arranged in the water outlet pipe 33, the other end of the pushing rotating shaft 39 penetrates through the water leakage chamber 31 and then is provided with a motor 41, and the pushing rotating shaft 39 is in transmission connection with a rotating output shaft of the motor 41;

the soil-shifting wheel 37 comprises a soil-shifting rotating shaft 42 rotatably arranged on the supporting plate 34 and the bottom wall of the water filtering chamber, an annular boss 43 fixedly arranged at the lower part of the soil-shifting rotating shaft 42, a plurality of soil-shifting rods 44 which are arranged on the outer annular wall of the annular boss 43 along the circumference and are eccentrically arranged, and helical teeth 45 which are arranged at the outer side end of each soil-shifting rod 44 and are meshed with the helical plate 40.

Further, a conical boss 46 is arranged above the annular boss 43, the outer diameter of the top of the conical boss 46 is equal to the outer diameter of the soil-shifting rotating shaft 42, and the outer diameter of the bottom of the conical boss 46 is equal to the outer diameter of the annular boss 43;

a soil cleaning rod 47 is arranged above the soil shifting wheel 37, and a cleaning brush 48 is arranged on the upper surface of the soil cleaning rod 47.

When the first aeration pond 10 is used, because the planting soil moves downwards along with the water flow, the thinner planting soil can gradually pass through the water filtering layer 36 and the support plate 34 and enter the water leakage chamber 31, the thinner planting soil can not only block the water outlet pipe 33 of the water leakage chamber 31 after a long time, but also block the water filtering holes if the water filtering holes of the support plate 34 are not cleaned, and the drainage problem of the first aeration pond 10 is caused, the invention arranges the material pushing screw 38 at one side of the water leakage chamber 31, under the condition that the water outlet pipe 33 and the water leakage holes 35 are not blocked, sewage can sequentially pass through the medium layer 14, the water leakage port, the water filtering layer 36 and the water leakage holes 35 and enter the water leakage chamber 31 and flow out through the spiral gap on the material pushing screw 38, the invention arranges the soil shifting wheel 37 in the water leakage chamber 31, arranges the soil shifting rod and the cleaning brush 48 above the soil shifting wheel 37, and drives the material pushing screw 38 to rotate through the motor 41 when the water outlet pipe 33 and the water leakage holes 35 are blocked, when the pushing screw 38 rotates, on one hand, soil falling into the coverage range of the spiral plate 40 is pushed out of the water outlet pipe 33, so that the water outlet pipe 33 is prevented from being blocked, on the other hand, the pushing screw 38 is meshed with the soil shifting wheel 37, the soil shifting wheel 37 is driven to rotate in the rotating process of the pushing screw 38, so that the cleaning rod and the cleaning brush 48 are driven to rotate, the soil blocked in the water leakage hole 35 is cleaned, and the water leakage hole 35 is prevented from being blocked; when the soil is fallen between the adjacent soil shifting rods 44, the soil can gradually move outwards under the pushing of the soil shifting rods 44 due to the eccentric arrangement of the soil shifting rods 44, finally reaches the position of the pushing spiral 38, and the water outlet pipe 33 is pushed out by the pushing spiral 38.

In order to effectively utilize the biological and ecological combined sewage treatment system, the invention also provides a biological and ecological combined sewage treatment method, which comprises the following steps:

step 1, treating a septic tank 2: sewage enters the septic tank 2, and macromolecular organic matters are partially hydrolyzed under the anaerobic condition of the septic tank 2, so that the COD of effluent is reduced;

step 2, pretreatment in a pretreatment tank 3: the sewage treated by the septic tank 2 is intercepted by a filtering grid 22 in the pretreatment tank 3 to remove large-particle sediment numbers and suspended matters;

step 3, treating the ecological base oxidation pond 5: the sewage treated by the pretreatment tank 3 enters an ecological base oxidation tank 5, stays in the ecological base oxidation tank 5 for 5-8 hours, the dissolved oxygen content is kept at 2.0-3.5 mg/L, and microorganisms in the ecological base oxidation tank 5 oxidize and decompose organic matters into inorganic matters under the aerobic condition, synthesize cell matters, remove COD and reduce the sludge production;

step 4, treating by a spherical ecological base rapid filter 6: the sewage treated by the ecological base oxidation tank 5 enters a spherical ecological base rapid filter tank 6, nitrite nitrogen and nitrate nitrogen in facultative anaerobic bacteria mixed liquor in the ecological base oxidation tank 5 are reduced into nitrogen gas and released into the air under the anoxic condition, and ammonia nitrogen in the sewage is removed;

step 5, treating a pan-oxygen pond: the sewage treated by the spherical ecological base rapid filter 6 enters the second general oxidation pond 11 after being disinfected, and phosphorus in the sewage is degraded by using aquatic plants 15 in the second general oxidation pond 11 and then is discharged through a purified water discharge pipe 9 while the sewage is temporarily stored in the second general oxidation pond 11.

As an embodiment of the biological and ecological combined sewage treatment method of the invention,

in the step 5, before entering the second flooding oxygen pond 11 after disinfection, the sewage also needs to enter the first flooding oxygen pond 10, and after the phosphorus in the sewage is degraded by using the aquatic plants 15 in the second flooding oxygen pond 11, the sewage is discharged into the second flooding oxygen pond 11.

The embodiments described above are only preferred embodiments of the invention and are not exhaustive of the possible implementations of the invention. Any obvious modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the invention so modified beyond the spirit and scope of the present invention.

Claims

1. A biological and ecological combined sewage treatment system is characterized by comprising a septic tank (2), a pretreatment tank (3), a biological treatment tank and an ecological treatment device, wherein the septic tank (2), the pretreatment tank (3), the biological treatment tank and the ecological treatment device are sequentially arranged in the sewage flow direction and are sequentially communicated through a sewage pipeline (1), a sewage main inlet (4) is arranged on the septic tank (2), the biological treatment tank comprises an ecological base oxidation tank (5) and a spherical ecological base rapid filter tank (6) which are sequentially arranged in the sewage flow direction, a first ecological base (7) is arranged in the ecological base oxidation tank (5), a second ecological base (8) is arranged in the spherical ecological base rapid filter tank (6), and a purified water drain pipe (9) is arranged on the ecological treatment device; the ecological treatment device comprises at least 1 oxygen-flooding pond, wherein each oxygen-flooding pond comprises a pond body (13) of which the inner surface is provided with a first impermeable layer (12), a medium layer (14) arranged in the pond body (13), and aquatic plants (15) arranged on the medium layer (14);

the number of the pan-oxidation ponds is two, the first pan-oxidation pond (10) is arranged at the upstream according to the sewage flow direction, and the second pan-oxidation pond (11) is arranged at the downstream;

the purified water drain pipe (9) is arranged on the second pan-oxidation pond (11);

a circular water leakage port is formed in the bottom of the first general oxidation pond (10), a water leakage chamber (31) is formed below the water leakage port, a second impermeable layer (32) is arranged on the inner surface of the water leakage chamber (31), a water outlet pipe (33) is arranged on one side of the water leakage chamber (31), a support plate (34) is arranged on the upper portion of the water leakage chamber (31), a plurality of water leakage holes (35) are formed in the support plate (34), a water filtering layer (36) is arranged between the support plate (34) and the medium layer (14), a soil cleaning and anti-blocking device is arranged in the water leakage chamber (31), the soil cleaning and anti-blocking device comprises a soil shifting wheel (37) rotatably arranged below the support plate (34), a material pushing spiral (38) arranged on one side of the soil shifting wheel (37), and the material pushing spiral (38) is meshed with the soil shifting wheel (37);

the pushing spiral (38) comprises a pushing rotating shaft (39) and a spiral plate (40) arranged on the pushing rotating shaft (39), one end of the pushing rotating shaft (39) is arranged in the water outlet pipe (33), the other end of the pushing rotating shaft (39) penetrates through the water leakage chamber (31) and then is provided with a motor (41), and the pushing rotating shaft (39) is in transmission connection with a rotating output shaft of the motor (41);

the soil shifting wheel (37) comprises a soil shifting rotating shaft (42) rotatably arranged on the support plate (34) and the bottom wall of the water filtering chamber, an annular boss (43) fixedly arranged at the lower part of the soil shifting rotating shaft (42), a plurality of soil shifting rods (44) which are arranged on the outer annular wall of the annular boss (43) along the circumference and are eccentrically arranged, and inclined teeth (45) which are arranged at the outer side ends of the soil shifting rods (44) and are meshed with the spiral plate (40);

a conical boss (46) is arranged above the annular boss (43), the outer diameter of the top of the conical boss (46) is equal to that of the soil stirring rotating shaft (42), and the outer diameter of the bottom of the conical boss (46) is equal to that of the annular boss (43);

soil clearing rods (47) are arranged above the soil shifting wheels (37), and cleaning brushes (48) are arranged on the upper surfaces of the soil clearing rods (47).

2. The bio-ecological combined sewage treatment system according to claim 1, wherein the bio-ecological treatment tank comprises a biological tank body (18), a hollow partition (19) is arranged in the biological tank body (18), the ecological-based oxidation tank (5) and the spherical ecological-based rapid filter (6) are separated into independent tank bodies by the hollow partition (19), a first overflowing opening (20) communicating the ecological-based oxidation tank (5) with the interior of the hollow partition (19) is formed in the upper portion of the side wall of one end of the hollow partition (19) close to the ecological-based oxidation tank (5), and a second overflowing opening (21) communicating the interior of the hollow partition (19) with the interior of the spherical ecological-based rapid filter (6) is formed in the lower portion or the bottom of the side wall of one end of the hollow partition (19) close to the spherical ecological-based rapid filter (6).

3. A bio-ecological combined sewage treatment system according to claim 1, wherein the bottom of the pretreatment tank (3) is provided with a filtering grid (22);

septic tank (2) include septic tank body (23), set up in 3 baffle (24) have set gradually according to the sewage flow direction in septic tank body (23), all be provided with third overflow mouth (25) on 3 baffle (24), third overflow mouth (25) on baffle (24) that are located both sides set up in the upper portion of corresponding baffle, and third overflow mouth (25) on baffle (24) that are located the centre set up in the lower part of corresponding baffle.

4. A bio-ecological combined sewage treatment system according to claim 1, wherein a first aeration device (26) is further arranged in the pond, a second aeration device (27) is arranged in the ecological base oxidation pond (5), and the first aeration device (26) and the second aeration device (27) are communicated with a blower (30) through a corresponding aeration branch pipe (28) and an aeration main pipe (29).

5. The bio-ecological combined sewage treatment system according to claim 1, wherein a sewage disinfection device (51) is further arranged between the spherical ecological base rapid filter (6) and the ecological treatment tank.

6. The application of the biological and ecological combined sewage treatment system as defined in any one of claims 1-5 in rural sewage treatment.