CN215799023U - Combined domestic sewage treatment equipment - Google Patents

Abstract

The utility model aims to solve the problems of respectively treating black water and gray water, treating different pollutants in different areas, having complex equipment, large occupied area and inconvenient use of the equipment in the prior art, and provides combined domestic sewage treatment equipment which comprises a precipitation separation area, an anaerobic filter bed area, an aeration filter bed area, a precipitation disinfection area and a clear water area which are sequentially communicated, wherein a phosphorus removal device is arranged in the precipitation separation area, an anaerobic filter bed is arranged in the anaerobic filter bed area, an aeration filter bed and a circulating aeration device are arranged in the aeration filter bed area, and a disinfection device and light fillers are arranged in the precipitation disinfection area.

Description

Combined domestic sewage treatment equipment

Technical Field

The utility model relates to the field of domestic sewage treatment, in particular to a combined domestic sewage treatment device.

Background

In recent years, with the improvement of domestic living standard and economic standard, the treatment of rural domestic sewage becomes a major factor in rural environmental treatment. Distributed sewage generated in villages and small towns and other areas has the characteristic of large change of water quality and water quantity, so that sewage treatment equipment is required to have better impact resistance; the processing facilities are required to be compact because the installation space owned by residents is limited; the residents do not have professional technical knowledge and enough economic strength and use complex and high-price facilities for sewage treatment, so that the equipment is also required to have the characteristics of high automation degree, stable operation, convenient maintenance, low price and the like. The development of small-sized domestic sewage treatment facilities, such as Membrane Bioreactor (MBR), A, appearing in the market, which are produced in response to the development of new rural construction and sewage treatment, is continuously emerging₂Although sewage treatment facilities such as/O and artificial wetland have a certain treatment effect on sewage, most treatment facilities are provided with independent treatment units for anaerobic, anoxic and aerobic environments respectively, and organic matters (COD) and ammonia Nitrogen (NH) are removed through different units respectively₃) Total pollutants such as nitrogen (TN), then set up Suspended Solid (SS) that a unit got rid of aquatic again at processing terminal for whole process flow is longer, wherein still need do nitrify liquid backward flow and mud backward flow, power equipment such as pump need be relied on in the rivers transport between each unit, whole device and technology are all very complicated, and the working capacity of common stealthily dirty pump is far more than small-size domestic sewage treatment facility's throughput and the little flow pump blocks easily when carrying sewage, the difficult matching of pump and sewage treatment facility, equipment operation and management are also corresponding complicacy. In addition, domestic sewage can be simply divided into black water and grey water according to different sources, the sewage containing excrement from a toilet is black water, and the common domestic sewage from a washing machine, a bathtub, a shower or a sink is grey water, and most of the domestic sewage on the market is grey waterThe domestic sewage treatment equipment is designed aiming at independent black water or independent grey water, the black water and the grey water are treated separately, the daily domestic sewage needs two sets of independent equipment for treatment, the floor area of the equipment is further increased, the construction investment is increased, the operation, maintenance and management of two or more kinds of equipment are independent, a lot of inconvenience is caused, the treatment problems of different sewage are difficult to fully and comprehensively consider by villagers in actual life, only one of the equipment is often installed in the initial stage, and secondary excavation, construction and installation are needed when another kind of equipment is recognized to be needed, so that more inconvenience is caused. In addition, the impact resistance of the general sewage treatment equipment is improved by matching the regulating water tank and the pump, but the complexity and the occupied area of the equipment are increased by regulating the water tank and the pump, and the treatment requirement of the distributed sewage in villages and towns cannot be well met.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a combined domestic sewage treatment device aiming at the problems of complex device, large occupied area, and inconvenient use and operation caused by the fact that domestic sewage treatment devices in the prior art respectively treat black water and grey water and arrange different areas to respectively remove pollutants such as organic matters, ammonia nitrogen, total nitrogen and the like.

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

a combined domestic sewage treatment device comprises a precipitation separation zone, an anaerobic filter bed zone, an aeration filter bed zone, a precipitation disinfection zone and a clear water zone which are sequentially communicated, wherein a phosphorus removal device is arranged in the precipitation separation zone, an anaerobic filter bed is arranged in the anaerobic filter bed zone, an aeration filter bed and a circulating aeration device are arranged in the aeration filter bed zone, and a disinfection device and light fillers are arranged in the precipitation disinfection zone.

Preferably, the anaerobic filter bed area is communicated with the aeration filter bed area through a flow regulating device, the flow regulating device comprises a regulating container, the regulating container is provided with a water outlet, a first water inlet and a regulating water inlet, the regulating container is of a sealing structure except the water outlet, the first water inlet and the regulating water inlet, the elevation of the first water inlet, the water outlet and the regulating water inlet is sequentially increased, the flow area of the first water inlet is smaller than that of the water outlet, the regulating container is arranged in the anaerobic filter bed area, and the water outlet is communicated with the aeration filter bed area.

Preferably, two or more than two adjusting water inlets are arranged, and the elevation of the adjusting water inlets is different.

Preferably, gaps are left between the inlets and outlets of the sedimentation separation zone and the anaerobic filter bed zone and the top wall of the corresponding zone.

Preferably, at least one of the sedimentation separation zone, the anaerobic filter bed zone and the aeration filter bed zone is arranged, and when a plurality of zones with the same function are arranged, the zones with the same function are sequentially connected in series.

Preferably, when one precipitation separation area is arranged, the precipitation separation area and the anaerobic filter bed area are communicated through a water passing short pipe in an inverted U shape, and the water passing short pipe is positioned at the middle upper part of the precipitation separation area.

Preferably, when two or more than two precipitation separation zones are arranged, the first precipitation separation zone is communicated with the second precipitation separation zone through an inverted U-shaped water passing short pipe, and the water passing short pipe is positioned at the middle upper part of the first precipitation separation zone; anaerobic filler is arranged in the precipitation separation area.

Preferably, the anaerobic filter bed and the aeration filter bed respectively comprise an upper layer of partition plate and a lower layer of partition plate and filler arranged between the two layers of partition plates; the filler filled in the anaerobic filter bed is a porous three-dimensional structure with the particle size of 20-80mm, and the specific surface area of the filler is more than or equal to 200 m²/m³The filling capacity of the filler is 50-90% of the space in the anaerobic filter bed area, the filler filled in the aeration filter bed is in a porous three-dimensional structure with the grain diameter of 20-80mm, and the specific surface area of the filler is more than or equal to 300m²/m³The filling capacity of the filler is 50-80% of the space in the aeration filter bed area.

Preferably, the volume ratio of the light filler in the precipitation disinfection area is 20-70%.

The utility model has the following beneficial effects:

the combined domestic sewage treatment equipment provided by the utility model has the advantages that the synchronous removal of large-volume waste and phosphorus-containing waste is realized by arranging the phosphorus removal device region in the precipitation separation region, the synchronous removal of part of nitrogen-containing waste, part of organic matters and part of suspended matters is realized by arranging the anaerobic filter bed in the anaerobic filter bed region, the removal of part of organic matters, ammonia nitrogen, total nitrogen and suspended matters is realized by arranging the aeration filter bed in the aeration filter bed region and the circulating aeration device region, and the synchronous removal of suspended matters, precipitates and bacterial viruses is realized by arranging the disinfection device in the precipitation disinfection region.

Drawings

FIG. 1 is a flow chart showing the use of the integrated domestic sewage treatment apparatus according to the present invention;

FIG. 2 is a schematic top view of an embodiment of the integrated domestic sewage treatment apparatus of the present invention, wherein the curved arrows indicate the direction of water flow;

FIG. 3 is a schematic cross-sectional view taken at A-A in FIG. 2;

FIG. 4 is a schematic cross-sectional view taken at B-B of FIG. 2;

FIG. 5 is a schematic view showing the construction of a cyclic aeration apparatus of the integrated domestic sewage treatment facility of the present invention, wherein the curved arrows indicate the directions of water flows;

FIG. 6 is a schematic view showing the structure of a backwash return device in a sedimentation sterilization zone of a combined sewage treatment apparatus according to the present invention, wherein the curved arrows indicate the direction of water flow;

FIG. 7 is a schematic structural view of a flow rate regulating device of the integrated domestic sewage treatment apparatus of the present invention.

Reference number specification, 100, conditioning vessel; 101. a first water inlet; 102. a water outlet; 103. adjusting a first water inlet; 104. adjusting a water inlet II; 201. a first zone of precipitation separation; 202. a second zone of precipitation separation; 203. a water passing short pipe; 300. an anaerobic filter bed zone; 301. an anaerobic filter bed; 401. an aeration filter bed area I; 402. an aeration filter bed zone II; 403. an aeration filter bed; 500. a precipitation disinfection area; 501. a sterilizing device; 600. a clear water zone; 700. a cyclic aeration device; 701. a flow guide pipe; 702. an air inlet pipe; 800. a backwashing device; 900. a backwashing reflux device; 901. a main return pipe; 902. a branch return pipe; 903. and an inflation tube.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. In which like parts are designated by like reference numerals.

A combined domestic sewage treatment device, as shown in figures 1 and 2, comprises a box body, wherein a plurality of partition plates are arranged in the box body to divide the space in the box body into a precipitation separation area, an anaerobic filter bed area 300, an aeration filter bed area, a precipitation disinfection area 500 and a clear water area 600, and the precipitation separation area, the anaerobic filter bed area 300, the aeration filter bed area, the precipitation disinfection area 500 and the clear water area 600 are communicated in sequence. The sedimentation separation area, the anaerobic filter bed area and the aeration filter bed area can be one or more, the number of each functional area can be increased to improve the treatment performance when the pollutants in water are more, and when each functional area is provided with two or more than two, the areas with the same function are sequentially connected in series. When two or more aeration filter bed areas are arranged, the content of pollutants in the sewage is greatly reduced due to the treatment of the previous aeration filter bed area, and the aeration rate of the next aeration filter bed area can be set to be 60-90% of that of the previous aeration filter bed area, so that the energy consumption caused by aeration is reduced. It should be noted that, when two or more settling separation zones are provided, the relatively clarified sewage in the middle of the former settling separation zone flows into the latter settling separation zone. In this embodiment, two sedimentation separation zones, an anaerobic filter bed zone 300 and two aerated filter bed zones are provided, and the first sedimentation separation zone 201, the second sedimentation separation zone 202, the anaerobic filter bed zone 300, the first aerated filter bed zone 401, the second aerated filter bed zone 402 and the sedimentation sterilization zone 500 are communicated in sequence.

The sewage is subjected to solid-liquid separation in the first precipitation separation zone 201 and the second precipitation separation zone 202 by gravity. A phosphorus removal device (not shown) is arranged in the first precipitation separation zone 201, phosphate in the sewage is changed into insoluble matters to be subjected to precipitation separation in the first precipitation separation zone 201, and residual phosphate can be further precipitated in the second precipitation separation zone 202. The phosphorus removal device can adopt a dosing phosphorus removal device or an electrolytic phosphorus removal device, the electrolytic phosphorus removal device is adopted in the embodiment, an iron plate or an aluminum plate is used as an electrode, and the electrode plate is immersed in the water in the precipitation separation zone. The sedimentation separation zone is anaerobic environment suitable for anaerobic microorganism growth, and anaerobic fillers are preferably arranged in the first sedimentation separation zone 201 and the second sedimentation separation zone 202, and the anaerobic fillers can adopt the same fillers (not shown in the figure) or rope type fillers as the fillers in the anaerobic filter bed zone 300. Through setting up the anaerobism filler, the anaerobism filler goes up the anaerobism microorganism of adnexed growth and takes place denitrification reaction with the nitrogenous waste material of sewage and carry out the denitrogenation and carry out organic matter degradation simultaneously, and the anaerobism filler is partial suspended solid in still can the removal sewage simultaneously, makes the effect that the sedimentation separation district can play partial anaerobism filter bed district, has increased the volume of anaerobism filter bed under the condition that does not influence precipitation effect, not increase equipment occupation space.

As shown in fig. 3, an anaerobic filter bed 301 is arranged in the anaerobic filter bed area 300, the anaerobic filter bed 301 comprises a partition board with upper and lower sides permeable to water, and a filler is filled between the two partition boards. The filling material is preferably porous three-dimensional structure with particle size of 20-80mm, and specific surface area of the filling material is more than or equal to 200 m²/m³The packing capacity of the packing in the anaerobic filter bed 301 is 50-90% of the space of the anaerobic filter bed area 300. The filler is attached with the growth anaerobic microorganisms, can perform denitrification reaction with nitrogenous waste in sewage to denitrify and perform organic matter degradation, and can also play a role in removing part of suspended matters in the sewage.

As shown in fig. 2 and 3, an aeration filter bed 403 and a cyclic aeration apparatus 700 are provided in both the first aeration filter bed zone 401 and the second aeration filter bed zone 402. The structure of the aeration filter bed 403 is similar to that of the anaerobic filter bed 301, and comprises water-permeable partition plates at the upper and lower sides, wherein the filler is filled between the two partition plates, a biological membrane is attached on the filler, the filled filler is preferably a porous three-dimensional structure with the particle size of 20-80mm, and the specific surface area of the filler is more than or equal to 300m²/m³The filling capacity of the filler in the aeration filter bed 403 is 50-80% of the space in the aeration filter bed area. Aerobic, anoxic and anaerobic microorganisms are attached to and grow on the filler in the aeration filter bed 403 to form a biological film, the biological film is in anaerobic, anoxic and aerobic environments from the inner region to the outer region in sequence, and sewage is treated by the microorganisms in the biological film and is subjected to organic matter decomposition, nitrification reaction and denitrification reaction at the same time. The water in the aeration filter bed zone is aerated while being circulated by the circulating aeration device 700, which is shown in fig. 5The circulating aeration device 700 comprises an air inlet pipe 702 and a vertically arranged guide pipe 701, the guide pipe 701 is arranged in the filter bed, the upper opening of the guide pipe 701 is close to the liquid level of an aeration filter bed area, the lower opening of the guide pipe 701 is close to the bottom of the aeration filter bed area, the air outlet end of the air inlet pipe 702 is positioned in the guide pipe 701 and is positioned at the lower part of the guide pipe 701, and the air inlet end of the air inlet pipe 702 is communicated with the air outlet of the air supply device. The air inlet pipe 702 is used for filling air into the flow guide pipe 701, so that the oxygen content in water is increased to realize aeration, meanwhile, the density of fluid in the flow guide pipe 701 is smaller than that of fluid outside the flow guide pipe 701, the external pressure of the flow guide pipe 701 is larger than the internal pressure, liquid at the bottom of an aeration filter bed area flows in from the bottom of the flow guide pipe 701, excessive water in the flow guide pipe 701 flows to the upper part of the aeration filter bed area from the upper part of the flow guide pipe 701, and the up-and-down circulation of water flow in the aeration filter bed area is realized.

As shown in fig. 3, a disinfection device 501 is disposed in the sedimentation disinfection zone 500, and the disinfection device 501 may be a commercially available device as long as it can disinfect and sterilize water. Lightweight fillers are arranged in the sedimentation and disinfection area 500, the fillers float in the sedimentation and disinfection area 500 and are concentrated on the upper half part of the sedimentation and disinfection area 500, and the volume ratio of the fillers in the sedimentation and disinfection area 500 is 20-70%. The bottom of the sedimentation sterilization zone 500 is preferably funnel-shaped to facilitate the concentration of the sediment. A pump (not shown) is disposed in the clean water area 600, and the pump can directly discharge the water in the clean water area 600 to the natural environment or be used for recycling.

By adopting the utility model, the combination treatment of the black water and the grey water can be carried out without distinguishing, and only one device is needed to meet the treatment requirements of the black water and the grey water, thereby greatly reducing the occupied area of the device and the cost of the device. Because the phosphorus-containing waste and the bulky waste can be synchronously removed in the precipitation separation zone, part of nitrogen-containing waste, part of organic matters and part of suspended matters can be synchronously removed in the anaerobic filter bed zone, anaerobic, anoxic and aerobic environments generated by the self structure of the biological membrane in the aeration filter bed zone can simultaneously carry out anaerobic, anoxic and aerobic reactions, part of organic matters, ammonia nitrogen and total nitrogen are synchronously removed, the filler can also play a role of filtering to remove part of suspended matters, bacteria and viruses, part of sediments and suspended matters in water can be synchronously removed in the precipitation disinfection zone, at least two types of pollutants are removed in each zone, the anoxic and aerobic treatment is not required to be independently carried out, and a better treatment effect can be obtained, so that the anoxic and aerobic zones do not need to be independently arranged, the equipment structure is simple, the occupied area is small, and the adopted process flow is relatively simple, the management and control are convenient.

The first sedimentation separation zone 201, the second sedimentation separation zone 202, the anaerobic filter bed zone 300, the first aeration filter bed zone 401, the second aeration filter bed zone 402 and the sedimentation sterilization zone 500 can be communicated through pipelines, through holes on a partition plate or other devices capable of transferring water flow. As shown in FIG. 4, the first precipitation separation zone 201 and the second precipitation separation zone 202 are preferably communicated through an inverted U-shaped water passing short pipe 203, and the anaerobic filter bed zone and the first aeration filter bed zone 401 are preferably communicated through a flow rate adjusting device, and in this embodiment, the rest of the zones are communicated through holes formed in the partition plate. The water passing short pipe 203 is positioned at the middle upper part of the first precipitation separation area 201, so that floating matters in the first precipitation separation area 201 can be reduced or prevented from entering the second precipitation separation area 202; if only one precipitation separation area is arranged, the precipitation separation area is communicated with the anaerobic filter bed area 300 through the inverted U-shaped water passing short pipe 203, and the straight pipe part of the water passing short pipe 203 is vertically arranged and is positioned at the middle upper part of the precipitation separation area. As shown in fig. 7, the flow rate adjusting device includes an adjusting container 100, the adjusting container 100 is provided with a water outlet 102, a first water inlet 101 and at least one adjusting water inlet, the adjusting container 100 is a sealed structure except for the water outlet 102, the first water inlet 101 and the adjusting water inlet, the elevations of the first water inlet 101, the water outlet 102 and the adjusting water inlet rise in sequence, the flow area of the first water inlet 101 is smaller than that of the water outlet 102, when the adjusting water inlet is provided with two or more than two, the elevations of the different adjusting water inlets are different, in this embodiment, two adjusting water inlets are provided, namely, the first adjusting water inlet 103 and the second adjusting water inlet 104. The conditioning vessel 100 is disposed within the anaerobic filter bed zone 300 and the water outlet 102 is in communication with the aerated filter bed zone one. When the device is used, the adjusting container 100 is arranged in the anaerobic filter bed area, the water outlet 102 is communicated with the aeration filter bed area, when a large amount of water is discharged into the anaerobic filter bed area within a certain period of time, the water inlet flow of the anaerobic filter bed area is far larger than the water inlet capacity and the water outlet capacity of the flow adjusting device, the water level in the anaerobic filter bed area can quickly rise to a position higher than the first water inlet 101 at the beginning, and the water flows into the adjusting container 100 from the first water inlet 101, because the caliber of the first water inlet 101 is small, the water inlet capacity is small, the water which cannot flow into the adjusting container 100 from the first water inlet 101 can be accumulated in the anaerobic filter bed area, so that the water level in the anaerobic filter bed area continuously rises; along with the water inlet of the first water inlet 101, the water level in the adjusting container 100 gradually rises until the water level is higher than the lowest point of the water outlet 102, the water in the adjusting container 100 is discharged from the water outlet 102 to the aeration filter bed area, in the process, the water quantity in the adjusting container 100 is limited by the water inlet capacity of the first water inlet 101, the increase of the water quantity and the rise of the water level in the adjusting container 100 are slower than those in the anaerobic filter bed area, because the flow rate of the water is positively correlated with the water pressure, the water pressure is positively correlated with the water level, and the product of the flow rate and the flow area is positively correlated with the water flow, the water pressure, the flow rate and the flow at the water outlet 102 can only gradually rise from a smaller value under the influence of the water quantity and the water level in the adjusting container 100, and the impact on the aeration filter bed area caused by the sudden inflow of a large amount of high-speed water into the next working unit is avoided; before the water level of the anaerobic filter bed area rises to the elevation of the adjusting water inlet, the water amount discharged into the aeration filter bed area is limited by the first water inlet 101 and the water outlet 102, as the caliber of the water outlet 102 is larger than that of the first water inlet 101, and the position of the water outlet 102 is higher than that of the first water inlet 101, the water outlet capacity of the water outlet 102 is changed from the water inlet capacity smaller than that of the first water inlet 101 to the water inlet capacity larger than that of the first water inlet 101 along with the rise of the water level in the anaerobic filter bed area, and the water amount discharged into the aeration filter bed area is mainly determined by the water outlet 102; when the water level in the anaerobic filter bed area rises to the adjusting water inlet, water flow enters the adjusting container 100 from the first water inlet 101 and the adjusting water inlet at the same time, the adjusting water inlet increases the water inlet capacity of the adjusting container 100, the water inlet capacity in the adjusting container 100 is not smaller than the water outlet capacity of the water outlet 102, stable water drainage is realized, the flow adjusting device can replace power equipment such as a pump, and under the condition of no external power, the water quantity discharged into the aeration filter bed area can be slowly increased from a smaller value along with the rise of the water level in the anaerobic filter bed area, the water flow change discharged into the aeration filter bed area is stable, the impact on the water outlet of the aeration filter bed area is small, the complexity of the equipment can be reduced, the equipment cost is reduced, and the equipment floor area is reduced. It should be noted that the inlets and outlets of the first sedimentation separation zone 201, the second sedimentation separation zone 202, the anaerobic filter bed zone 300, the first aeration filter bed zone 401, the second aeration filter bed zone 402, the sedimentation sterilization zone 500 and the clean water zone 600 are all disposed at diagonal positions of the corresponding zones or zones as much as possible, and taking the position shown in fig. 2 as an example, when the inlet is disposed at the lower left end of the corresponding zone, the outlet is disposed at the upper right end of the corresponding zone, so that the path length of the water flow can be increased as much as possible. The inlets and outlets of the first sedimentation separation zone 201, the second sedimentation separation zone 202 and the anaerobic filter bed zone 300 are preferably spaced from the top walls of the corresponding zones, and the distance between the top walls and the corresponding inlets and outlets can be used as a flow regulation area to reduce the flow impact on the next unit.

As shown in fig. 2 and fig. 6, the combined domestic sewage treatment apparatus may further include a backwashing device 800 and a backwashing reflux device 900. As shown in fig. 2, the backwashing device 800 is arranged between the fillers in the aeration filter bed area and the sedimentation sterilization area 500, the backwashing device 800 is a frame structure composed of a plurality of pipelines, the pipelines of the backwashing device 800 are mutually communicated and provided with through holes, the pipelines are communicated with the air outlet of the air supply device, and gas or water vapor mixed liquid is sprayed out from the through holes during backwashing to forcibly wash the thickened and aged biomembrane on the fillers to make the biomembrane fall off. The backwash device 800 may be constructed using other conventional backwash devices 800. The backwashing backflow device 900 comprises a main backflow pipe 901, branch backflow pipes 902 and an inflation pipe 903, the branch backflow pipes 902 are three, the three branch backflow pipes 902 are respectively communicated with the bottom of a first aeration filter bed area 401 and the main backflow pipe 901, the bottom of a second aeration filter bed area 402 and the main backflow pipe 901, the bottom of a sedimentation sterilization area and the main backflow pipe 901, each branch backflow pipe 902 is correspondingly provided with an inflation pipe 903, the air outlet end of the inflation pipe 903 is communicated with the corresponding branch backflow pipe 902, the air inlet end of the inflation pipe 903 is communicated with the air outlet of an air supply device, the air supply device inflates air into the branch backflow pipe 902 through the inflation pipe 903, the density of fluid in the branch backflow pipe 902 is smaller than that of fluid outside the branch backflow pipe 902, the external pressure of the branch backflow pipe 902 is larger than the internal pressure, so that the external fluid flows into the branch backflow pipe 902 to realize backflow. In order to accommodate and effectively treat the sludge returned from the aerated filter bed zone, the first sedimentation separation zone is preferably large, and the second sedimentation separation zone is preferably provided. The backwash return device 900, the backwash device 800 and the cyclic aeration device 700 may be supplied with air by the same air supply device, and the air supply device used in this embodiment is a blower. Usually, the regulating container body is of a closed hollow structure, and a water inlet, a water outlet and a regulating water inlet are arranged on the regulating container body so as to ensure that water enters the container body from the water inlet and flows out from the water outlet.

The specific examples are merely illustrative of the utility model and are not intended to be limiting.

Claims (9)

1. The utility model provides a merge formula sewage treatment device which characterized in that: the device comprises a precipitation separation zone, an anaerobic filter bed zone (300), an aeration filter bed zone, a precipitation disinfection zone (500) and a clear water zone (600) which are sequentially communicated, wherein a phosphorus removal device is arranged in the precipitation separation zone, an anaerobic filter bed (301) is arranged in the anaerobic filter bed zone (300), an aeration filter bed (403) and a circulating aeration device (700) are arranged in the aeration filter bed zone, and a disinfection device (501) and light fillers are arranged in the precipitation disinfection zone (500).

2. The combined domestic sewage treatment apparatus according to claim 1, wherein: the anaerobic filter bed area (300) is communicated with the aeration filter bed area through the flow adjusting device, the flow adjusting device comprises an adjusting container (100), the adjusting container (100) is provided with a water outlet (102), a first water inlet (101) and an adjusting water inlet, the adjusting container (100) is of a sealing structure except the water outlet (102), the first water inlet (101) and the adjusting water inlet, the elevation of the first water inlet (101), the water outlet (102) and the adjusting water inlet are sequentially increased, the flow area of the first water inlet (101) is smaller than that of the water outlet (102), the adjusting container (100) is arranged in the anaerobic filter bed area (300), and the water outlet (102) is communicated with the aeration filter bed area.

3. The combined domestic sewage treatment apparatus according to claim 1, wherein: the adjusting water inlets are provided with two or more than two adjusting water inlets, and the elevation of the adjusting water inlets is different.

4. The combined domestic sewage treatment apparatus according to claim 1, wherein:

gaps are left between the inlets and outlets of the sedimentation separation zone and the anaerobic filter bed zone (300) and the top walls of the corresponding zones.

5. The combined domestic sewage treatment apparatus according to claim 1, wherein: at least one of the sedimentation separation zone, the anaerobic filter bed zone (300) and the aeration filter bed zone is arranged, and when a plurality of zones with the same function are arranged, the zones with the same function are sequentially connected in series.

6. The combined domestic sewage treatment apparatus according to claim 5, wherein: when one precipitation separation area is arranged, the precipitation separation area and the anaerobic filter bed area (300) are communicated through an inverted U-shaped water passing short pipe (203), and the water passing short pipe (203) is positioned at the middle upper part of the precipitation separation area.

7. The combined domestic sewage treatment apparatus according to claim 5, wherein: when the precipitation separation area is provided with two or more than two, the first precipitation separation area (201) is communicated with the second precipitation separation area (202) through an inverted U-shaped water passing short pipe (203), and the water passing short pipe (203) is positioned at the middle upper part of the first precipitation separation area (201); anaerobic filler is arranged in the precipitation separation area.

8. The combined domestic sewage treatment apparatus according to claim 1, wherein:

the anaerobic filter bed (301) and the aeration filter bed (403) both comprise an upper layer of clapboard and a lower layer of clapboard and filler arranged between the two layers of clapboards; the filler filled in the anaerobic filter bed (301) is a porous three-dimensional structure with the grain diameter of 20-80mm and is filledThe specific surface area of the material is more than or equal to 200 m²/m³The filling capacity of the filler is 50-90% of the space in the anaerobic filter bed area (300), the filler filled in the aeration filter bed (403) is a porous three-dimensional structure with the grain diameter of 20-80mm, and the specific surface area of the filler is more than or equal to 300m²/m³The filling capacity of the filler is 50-80% of the space in the aeration filter bed area.

9. The combined domestic sewage treatment apparatus according to claim 2, wherein: the volume ratio of the light filler in the precipitation disinfection area (500) is 20-70%.

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