CN214218496U - Biological filter system - Google Patents

Abstract

The utility model discloses a biological filter system, include: the system comprises a grid regulating tank, a biological trickling filter and a collected liquid reflux device, wherein the grid regulating tank is used for storing sewage; a submersible pump is arranged in the biological trickling filter and is used for lifting sewage to the upper end of the biological trickling filter, a water distribution pipeline communicated with the submersible pump is arranged at the upper end of the biological trickling filter, a biological filter material is filled in the biological trickling filter, and a ventilation hole for circulating air is formed in the side wall of the biological trickling filter; the liquid collecting and refluxing device is arranged at the lower end of the biological trickling filter, one side of the liquid collecting and refluxing device is connected with a water outlet pipe, the other side of the liquid collecting and refluxing device is connected with a refluxing pipe, the refluxing pipe extends to the grid regulating tank, and the liquid collecting and refluxing device is used for collecting sewage and can regulate the flow of the sewage entering the water outlet pipe and the refluxing pipe. The utility model provides a pair of biological filter system can keep the stable quality of water of play under the undulant great condition of flow of sewage treatment.

Description

Biological filter system

Technical Field

The utility model relates to a sewage treatment technical field especially relates to a biological filter system.

Background

At present, untreated rural domestic sewage is discharged randomly, on one hand, various water sources such as rivers, lakes and ponds and rural ecological environments are seriously polluted, on the other hand, the rural domestic sewage is easy to cause the occurrence and the prevalence of part of regional infectious diseases, endemic diseases, zoonosis and the like, becomes a source of disease infection diffusion, and threatens the body health of vast farmers and the development of rural economy. The rural domestic sewage refers to excrement and flushing water thereof, bath sewage and kitchen sewage in the living process of rural residents and sewage generated in the decentralized culture process of some rural villages. Generally speaking, rural domestic sewage is different from urban sewage, has characteristics of discharge mode, water quality, water quantity and the like, and is mainly characterized in that components are complex, a certain amount of nitrogen and phosphorus are contained, biodegradability of the rural domestic sewage is high, heavy metals and toxic and harmful substances are basically not contained, and flow fluctuation is large. Therefore, the rural domestic sewage treatment mode cannot be carried or applied to the urban domestic sewage treatment mode, scientific decision making needs to be carried out by combining the actual conditions of rural areas and the characteristics of the domestic sewage, and rural sewage treatment facilities are distributed dispersedly, the treatment scale is small, and the number is large. In the existing sewage treatment facility, the large fluctuation of the sewage flow can cause the large fluctuation of the effluent quality, and the equipment is complex, thereby causing large workload and high maintenance cost.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a biological filter system can keep going out water quality of water stable according to sewage inflow automatically regulated water yield, the great condition of sewage treatment volume change.

According to a first aspect embodiment of the utility model embodiment a biological filter system includes: the system comprises a grid regulating tank, a biological trickling filter and a collected liquid reflux device, wherein the grid regulating tank is used for storing sewage; the biological trickling filter is internally provided with a submersible pump, the submersible pump is used for lifting sewage to the upper end of the biological trickling filter so as to keep the water level in the biological trickling filter stable, the upper end of the biological trickling filter is provided with a water distribution pipeline communicated with the submersible pump, biological filter materials for adhesion of microorganism groups are filled in the biological trickling filter, and the side wall of the biological trickling filter is provided with a vent hole for circulating air in the biological trickling filter; the device comprises a grid adjusting tank, a liquid collecting reflux device, a water level adjusting device, a grid adjusting tank, a water level adjusting device, a liquid collecting reflux device and a water level adjusting device, wherein the liquid collecting reflux device is arranged at the lower end of the biological trickling filter, one side of the liquid collecting reflux device is connected with a water outlet pipe, the other side of the liquid collecting reflux device is connected with a reflux pipe, the reflux pipe extends to the grid adjusting tank, the liquid collecting.

According to the utility model discloses biological filter system has following technological effect at least: the embodiment of the utility model provides a pair of biological filter system, the immersible pump in the grid equalizing basin carries sewage to the water distribution pipeline of biological trickling filter upper end, and its rotational speed of immersible pump adjustment makes the grid equalizing basin water level stable according to the water level change in the grid equalizing basin. Then evenly drip to the biological filter material, go up sewage and air and circulate jointly through the biological filter material, rely on the biomembrane that adheres to the biological filter material surface to adsorb, oxidize and decompose the pollutant, collect the sewage in the biological trickling filter with collection liquid reflux unit, collect the flow that liquid reflux unit distributes sewage and gets into outlet pipe and back flow, sewage can keep the circulation state always in the biological trickling filter. The water quality of the effluent can be kept stable under the condition of large flow fluctuation of the treated sewage.

According to some embodiments of the utility model, the biological trickling filter with be equipped with airtight biological filter between the immersible pump, airtight biological filter inside is equipped with a plurality of water conservancy diversion baffles, the water conservancy diversion baffle is used for increasing the circulation distance of sewage, airtight biological filter is filled there are a plurality of fixed biofilm carriers, fixed biofilm carrier is used for supplying the microbial community to adhere to in order to form the biomembrane, airtight biological filter top is equipped with and is used for the inspection to change fixed biofilm carrier's sealed lid.

According to some embodiments of the utility model, the bio-trickling filter lower extreme is equipped with the support frame, the support frame lower extreme links to each other with ground is fixed.

According to some embodiments of the utility model, airtight biological filter sets up directly under the bio-trickling filter, highly being convenient for of support frame is opened sealed lid is in order to change fixed biofilm carrier.

According to some embodiments of the utility model, the water distribution pipeline includes that the water distribution is responsible for and a plurality of water distribution auxiliary pipe, the equidistant symmetric connection of water distribution auxiliary pipe is in the both sides that the water distribution was responsible for, a plurality of water distribution holes that are located same horizontal plane are seted up to the water distribution auxiliary pipe lateral wall.

According to some embodiments of the utility model, the level is equipped with a plurality of perforation bearing plates in the biological trickling filter, biological filter material is placed on the perforation bearing plate, the perforation bearing plate is used for supplying sewage circulation and support biological filter material.

According to some embodiments of the utility model, a plurality of quick interfaces along the range of vertical direction are seted up to biological trickling filter left side lower extreme, be connected with the valve on the quick interface, it is a plurality of the quick interface respectively through a plurality of valves with the back flow links to each other.

According to some embodiments of the utility model, it includes water receiving plate, overflow plate, deposits the baffle to collect liquid reflux unit, the water receiving plate sets up the downside perforate bearing plate below, the overflow plate is connected water receiving plate left end, it connects to deposit the baffle biological trickling filter bottom wall, the water receiving plate will drip sewage water conservancy diversion on the water receiving plate extremely deposit the baffle left side, it is in to go out the water piping connection biological trickling filter right side lower extreme, overflow plate lower extreme height is less than deposit the baffle upper end height so that the froth in the sewage is blockked overflow plate left side, it is used for blockking the solid impurity in the sewage to deposit the baffle, makes solid impurity subside deposit the baffle left side, in order to reduce the solid impurity that discharge sewage contains in the outlet pipe.

According to some embodiments of the utility model, the slope of water receiving plate sets up in the biological trickling filter, just water receiving plate right-hand member height is greater than water receiving plate left end height.

According to some embodiments of the utility model, go out water piping connection and have middle pond, middle pond is used for the process sewage after the bio-trickling filter is handled deposits, middle pond is connected with constructed wetland, constructed wetland is to the process sewage after middle pond is handled carries out the absorption and the depth filtration of phosphorus, improves water quality.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic view of an installation structure of an embodiment of the present invention;

FIG. 2 is a schematic view of a water distribution pipe according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of a bio-trickling filter according to an embodiment of the present invention.

Reference numerals:

a grid regulating tank 100, a grid 101 and a submersible pump 110;

the biological trickling filter comprises a biological trickling filter 200, a quick connector 201, a water distribution pipeline 210, a water distribution main pipe 211, a water distribution auxiliary pipe 212, a water distribution hole 213, a biological filter material 220, a vent hole 230 and a perforated bearing plate 240;

the device comprises a liquid collecting reflux device 300, a water outlet pipe 310, a reflux pipe 320, a water receiving plate 330, a water falling port 331, an overflow plate 340 and a settling baffle 350;

the biological filter comprises a closed biological filter 400, a flow guide baffle 410, a fixed biological filler 420 and a sealing cover 430;

a support frame 500;

an intermediate water tank 600;

and (6) artificial wetland 700.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 3, a biofilter system according to an embodiment of the present invention includes: the biological trickling filter comprises a grid regulating tank 100, a biological trickling filter 200 and a collected liquid reflux device 300, wherein the grid regulating tank 100 is used for storing sewage, a grid 101 is arranged in the grid regulating tank 100, and the grid 101 is used for intercepting large floating objects and suspended matters in water; the grid equalizing basin 100 can also homogenize the water quality and the water quantity, and because the concentration of organic matters and the like in the sewage is higher, the organic matters can be diluted after entering the grid equalizing basin 100. The grid equalizing basin 100 is internally provided with two submersible pumps 110, and the two submersible pumps 110 are mutually standby. The submersible pump 110 is used for lifting the sewage to the upper end of the biological trickling filter 200; the rotating speed of the submersible pump 110 increases and decreases as the water level in the grid regulating reservoir 100 rises and falls. The water level of the grill regulating reservoir 100 is kept stable. The upper end of the biological trickling filter 200 is provided with a water distribution pipeline 210 communicated with the submersible pump 110, sewage uniformly enters the upper end of the biological trickling filter 200 through the water distribution pipeline 210, a biological filter material 220 for attaching microorganism groups is filled in the biological trickling filter 200, the stacking height of the biological filter material 220 is 2.0-3.0m, and the filler is sequentially ceramsite, volcanic rock and sponge iron from top to bottom. The sewage flows through the biological filter material 220 from top to bottom under the action of gravity, the side wall of the biological trickling filter 200 is provided with a vent hole 230 for enabling air inside the biological trickling filter 200 to circulate, the sewage and the air flow through the biological filter material 220 together, pollutants are adsorbed, oxidized and decomposed by a biological membrane attached to the surface of the biological filter material 220, and the pollutants are physically intercepted and filtered by the biological filter material 220. The lower end of the biological trickling filter 200 is provided with a liquid collecting reflux device 300 for collecting sewage, and one side of the liquid collecting reflux device 300 is connected with a water outlet pipe 310. The other side is connected with a return pipe 320, the return pipe 320 extends to the grid equalizing basin 100 to dilute the sewage in the grid equalizing basin 100, and the collected liquid reflux device 300 can distribute the flow of the sewage entering the water outlet pipe 310 and the return pipe 320 according to the sewage entering the biological trickling filter 200 because the flow fluctuation of the sewage entering the grid equalizing basin 100 is large, so that the circulation volume of the sewage passing through the biological trickling filter 200 is kept stable. The amount of sewage entering the biotrickling filter 200 directly affects the water level in the liquid collecting reflux device 300, so that when the water level in the liquid collecting reflux device 300 is lower than the working water level, the sewage only enters the reflux pipe 320, and when the water level in the liquid collecting reflux device 300 is higher than the working water level, at least part of the sewage enters the water outlet pipe 310. It is anticipated that the rotation speed or start/stop of the submersible pump 110 may be manually controlled or a float switch may be provided in the grill regulation tank 100 to automatically control the start/stop of the submersible pump 110 in order to ensure the stable water level in the grill regulation tank 100.

The utility model provides a pair of biological filter system, immersible pump 110 in the grid equalizing basin 100 carries sewage to the water distribution pipeline 210 of biological trickling filter 200 upper end, then evenly drips on biological filter material 220, and sewage circulates the process with the air jointly biological filter material 220 relies on the biomembrane that adheres to biological filter material 220 surface to adsorb, oxidize and decompose the pollutant, collects the sewage collection in liquid reflux unit 300 with biological trickling filter 200, and liquid reflux unit 300 adjusts the flow that sewage got into outlet pipe 310 and back flow 320, makes the water yield that gets into outlet pipe 310 increase along with immersible pump 110 carries the sewage volume, and the water yield that gets into outlet pipe 310 reduces along with immersible pump 110 carries the sewage volume. Thereby keeping the sewage circulation quantity of the biological trickling filter 200 stable and being beneficial to improving the purification efficiency. Can keep the quality of the effluent stable under the condition of large flow fluctuation of the treated sewage.

In some embodiments of the present invention, an airtight biofilter 400 is disposed between the biofilter 200 and the submersible pump 110, the airtight biofilter 400 is disposed underground and below the biofilter 200, for reducing the investment cost and facilitating the maintenance, the airtight biofilter 400 is disposed in the same room as the biofilter 200, and the wall of the room is disposed with a mosquito-proof shutter for facilitating the ventilation. A plurality of flow guide baffles 410 are arranged in the sealed biofilter 400, the flow guide baffles 410 are arranged in an equidistant and staggered mode, the flow guide baffles 410 are used for increasing the circulation path and the flow speed of sewage, a plurality of fixed biological fillers 420 are filled in the sealed biofilter 400, the fixed biological fillers 420 are made of composite materials such as porous ceramics, and the filling proportion of the fixed biological fillers 420 is 0.3-0.5. The fixed biological filler 420 is used for attaching microorganisms to form a biological membrane, the top of the closed biological filter 400 is provided with a sealing cover 430 for checking and replacing the fixed biological filler 420, the sealing cover 430 is connected to the top of the closed biological filter 400 through bolts, and the sealing cover 430 is used for ensuring that water cannot seep and leak in the operation process and is convenient to overhaul and clean.

In some embodiments of the present invention, the bio-trickling filter 200 is provided with a support frame 500 at the lower end thereof, and the support frame 500 is used to elevate the bio-trickling filter 200 for ventilation. The lower end of the supporting frame 500 is fixedly connected with the ground, and the sewage fall in the return pipe 320 can be enlarged after the biological trickling filter 200 is elevated, which is beneficial to the return of sewage.

In some embodiments of the present invention, the closed biofilter 400 is disposed under the bio-trickling filter 200, the supporting frame 500 is highly convenient to open the sealing cover 430 to replace the fixed bio-filler 420, and the worker can simultaneously check and maintain the bio-trickling filter 200 and the closed biofilter 400, thereby reducing the labor intensity.

In some embodiments of the present invention, the water distribution pipe 210 includes a main water distribution pipe 211 and a plurality of auxiliary water distribution pipes 212, the main water distribution pipe 211 communicates with the submersible pump 110, the auxiliary water distribution pipes 212 are symmetrically connected to both sides of the main water distribution pipe 211 at equal intervals, a plurality of water distribution holes 213 located on the same horizontal plane are disposed on the side wall of the auxiliary water distribution pipe 212, and the sewage enters the auxiliary water distribution pipes 212 from the main water distribution pipe 211 and then flows out from each water distribution hole 213. The number of the water distribution auxiliary pipes 212 and the water distribution holes 213 is determined according to the size of the cross section of the biological trickling filter 200, so that the distance between the adjacent water distribution holes 213 can meet the working requirement of uniformly distributing sewage on the biological filter material 220.

In some embodiments of the present invention, three perforated bearing plates 240 are horizontally disposed in the bio-trickling filter 200, and the perforated bearing plates 240 are welded to the inner side wall of the bio-trickling filter 200. The perforated bearing plate 240 is a vertical honeycomb shape to facilitate the passage of sewage. The perforated bearing plate 240 is preferably made of a material with high strength and corrosion resistance, such as stainless steel. The biological filter 220 is placed on the perforated load-bearing plate 240, and the perforated load-bearing plate 240 is used for sewage circulation and for supporting the biological filter 220. The number of perforated bearing plates 240 determines the number of layers of installed biological filter materials 220, and the more the number of layers of installed biological filter materials 220 is, the higher the purification efficiency is.

In some embodiments of the present invention, the three quick connectors 201 arranged at equal intervals along the vertical direction are disposed at the lower end of the left side of the bio-trickling filter 200, the quick connectors 201 are connected with valves, the quick connectors 201 are connected with the return pipe 320 through a plurality of valves, and the quick connectors 201 are all located below the highest water level line of the bio-trickling filter 200. When the water level in the bio-trickling filter 200 is constant, the more the quick connector 201 below the water level is away from the water level, the larger the pressure difference is, and the more sewage flows back to the grid regulating tank 100 through the quick connector 201. By opening and closing the valve on each quick connector 201, different quick connectors 201 are opened or closed, and the amount of sewage flowing back to the grid regulation pool 100 can be effectively regulated. The water level in the bio-trickling filter 200 can be kept stable in case of fluctuations in the influent water flow. It is expected that the sewage backflow proportion is 50-100% in order to enable the backflow sewage quantity to meet the requirement of the circulating water quantity of the biological trickling filter 200.

In some embodiments of the present invention, the liquid collecting and returning device 300 comprises a water receiving plate 330, an overflow plate 340, and a sedimentation baffle 350, wherein the water receiving plate 330 is disposed below the lowest perforated bearing plate 240, a water falling port 331 is formed between the water receiving plate 330 and the left side wall of the bio-trickling filter 200, the overflow plate 340 is welded at the left end of the water receiving plate 330, the sedimentation baffle 350 is welded at the bottom wall of the bio-trickling filter 200, the upper end of the sedimentation baffle 350 is inclined to the right so that the sewage flows through the upper end of the sedimentation baffle 350, the water falling port 331 is located above the left side of the sedimentation baffle 350, a water outlet pipe 310 is connected at the lower end of the right side of the bio-trickling filter 200, the lower end of the overflow plate 340 is lower than the upper end of the sedimentation baffle 350, when the height of the sewage at the left side of the sedimentation baffle 350 is greater than the height of the sedimentation baffle 350, the lower end of the overflow plate 340 is located below the sewage level line, the floating foam floating on the water surface can be blocked at the left side of the overflow plate 340 by the overflow plate 340, the settling baffle 350 is used to block solid impurities in the sewage, so that the solid impurities settle at the left side of the settling baffle 350, thereby reducing the content of the solid impurities in the sewage discharged from the water outlet pipe 310. The height of the settling baffle 350 is equal to the operating water level. When the height of the sewage on the left side of the settling baffle 350 is greater than that of the settling baffle 350, the sewage overflows from the upper end of the settling baffle 350 to the right side of the settling baffle 350 and is then discharged from the water outlet pipe 310. When the height of the sewage on the left side of the settling baffle 350 is smaller than that of the settling baffle 350, the sewage completely enters the return pipe, and the amount of the circulating sewage in the biological trickling filter 200 is ensured not to be reduced.

In some embodiments of the present invention, the water receiving plate 330 is disposed in the biotrickling filter 200 in an inclined manner, and the right end of the water receiving plate 330 is higher than the left end of the water receiving plate 330, and the inclination angle of the water receiving plate 330 is 1 degree. The sewage dropping on the water receiving plate 330 can slide down to the water falling port 331 along the water receiving plate 330, preventing impurities in the sewage from depositing on the upper end of the water receiving plate 330.

In some embodiments of the utility model, outlet pipe 310 is connected with middle pond 600, middle pond 600 is used for deposiing and oxygen elimination to the sewage after biological trickling filter 200 handles, middle pond 600 is connected with constructed wetland 700, constructed wetland 700 takes the form of undercurrent constructed wetland 700, the inside quartz sand that fills of constructed wetland 700, ordinary grass seeds are planted on quartz sand upper portion, constructed wetland 700's the height that highly is less than middle pond 600 minimum water level, hydroenergy in middle pond 600 flows to constructed wetland 700 under the action of gravity, constructed wetland 700 is used for carrying out the absorption and the deep filtration of phosphorus to the sewage after middle pond 600 handles.

The working principle is as follows: the sewage is firstly discharged into the grid adjusting tank 100, after larger floating objects and suspended matters are filtered, the sewage is lifted into the closed biological filter 400 by the submersible pump 110, the upper part of the closed biological filter 400 is provided with the sealing cover 430, the water leakage and water seepage can be ensured in the operation process, the overhaul and the cleaning are convenient, the sewage flows through each fixed biological filler 420 in sequence under the action of the flow guide baffle plate 410, an anoxic environment is formed in the closed biological filter 400, the anaerobic bacteria on the fixed biological fillers 420 decompose organic matters in the sewage under the anaerobic environment, the sewage enters the water distribution pipeline 210 at the upper end of the biological trickling filter 200 after being discharged from the closed biological filter 400, the sewage is uniformly sprayed on the biological filter material 220 through the water distribution holes 213 on the pipeline, the sewage falls down along the biological filter material 220 under the action of gravity, the sewage and air flow through the biological filter material 220 together, and the organic matters in the sewage are further decomposed by the aerobic bacteria, the bio-trickling filter 200 is in air communication by means of the side wall vents 230 to provide oxygen for aerobic bacteria. The sewage falls to the water receiving plate 330, the water receiving plate 330 has a slope, the overflow plate 340 guides the sewage to the left side of the sedimentation baffle 350, and about 50-100% of the sewage flows back to the grid regulating pond 100 through the return pipe 320 for diluting the sewage to be treated and maintaining the flow of the sewage flushing the biological filter material 220. When the sewage flow is large, the height of the sewage on the left side of the settling baffle 350 is larger than that of the settling baffle 350, and part of the sewage overflows to the right side of the settling baffle 350 from the upper end of the settling baffle 350 and then is discharged from the water outlet pipe 310. When the sewage flow is small, the height of the sewage on the left side of the settling baffle 350 is smaller than that of the settling baffle 350, and the sewage flows back completely. The sewage enters the intermediate water tank 600 to complete sedimentation and oxygen elimination, then enters the artificial wetland 700 to complete phosphorus adsorption and deep filtration, and then is discharged to a natural water body.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A biofilter system, comprising:

a grid equalizing basin (100) for storing sewage;

the biological trickling filter comprises a biological trickling filter (200), wherein a submersible pump (110) is arranged in a grid adjusting tank (100), the submersible pump (110) is used for lifting sewage to the upper end of the biological trickling filter (200) so as to keep the water level in the biological trickling filter (200) stable, a water distribution pipeline (210) communicated with the submersible pump (110) is arranged at the upper end of the biological trickling filter (200), a biological filter material (220) for the attachment of microorganism groups is filled in the biological trickling filter (200), and a vent hole (230) for enabling the air in the biological trickling filter (200) to circulate is formed in the side wall of the biological trickling filter (200);

the biological trickling filter (200) is provided with a liquid collecting reflux device (300), the lower end of the biological trickling filter (200) is provided with a water outlet pipe (310) on one side of the liquid collecting reflux device (300), the other side of the liquid collecting reflux device is provided with a reflux pipe (320), the reflux pipe (320) extends to the grid regulating pool (100), the liquid collecting reflux device (300) is used for collecting sewage, when the water level in the liquid collecting reflux device (300) is lower than the working water level, the sewage only enters the reflux pipe (320), and when the water level in the liquid collecting reflux device (300) is higher than the working water level, at least part of the sewage enters the water outlet pipe (310).

2. A biofilter system according to claim 1, wherein: biological trickling filter (200) with be equipped with airtight biological filter (400) between immersible pump (110), airtight biological filter (400) inside is equipped with a plurality of water conservancy diversion baffles (410), water conservancy diversion baffle (410) are used for increasing the circulation route of sewage, airtight biological filter (400) are filled there are a plurality of fixed biofilm carriers (420), fixed biofilm carrier (420) are used for supplying the microbial community to adhere to in order to form the biomembrane, airtight biological filter (400) top is equipped with and is used for the inspection to change sealed lid (430) of fixed biofilm carrier (420).

3. A biofilter system according to claim 2, wherein: the bio-trickling filter (200) is characterized in that a support frame (500) is arranged at the lower end of the bio-trickling filter, and the lower end of the support frame (500) is fixedly connected with the ground.

4. A biofilter system according to claim 3, wherein: the closed biological filter (400) is arranged under the biological trickling filter (200), and the height of the support frame (500) is convenient for opening the sealing cover (430) to replace the fixed biological filler (420).

5. A biofilter system according to claim 1, wherein: the water distribution pipeline (210) comprises a water distribution main pipe (211) and a plurality of water distribution auxiliary pipes (212), the water distribution auxiliary pipes (212) are symmetrically connected to two sides of the water distribution main pipe (211) at equal intervals, and a plurality of water distribution holes (213) located on the same horizontal plane are formed in the side wall of each water distribution auxiliary pipe (212).

6. A biofilter system according to claim 1, wherein: the bio-trickling filter (200) is internally and horizontally provided with a plurality of perforated bearing plates (240), the biological filter material (220) is placed on the perforated bearing plates (240), and the perforated bearing plates (240) are used for sewage circulation and supporting the biological filter material (220).

7. A biofilter system according to claim 6, wherein: the utility model discloses a biological trickling filter (200) is characterized in that a plurality of quick connectors (201) along the range of vertical direction are seted up to biological trickling filter (200) left side lower extreme, be connected with the valve on quick connector (201), it is a plurality of quick connector (201) respectively through a plurality of valves with back flow (320) link to each other.

8. A biofilter system according to claim 7, wherein: the liquid collection backflow device (300) comprises a water receiving plate (330), an overflow plate (340) and a precipitation baffle plate (350), wherein the water receiving plate (330) is arranged below the perforated bearing plate (240) at the lowest side, the overflow plate (340) is connected to the left end of the water receiving plate (330), the precipitation baffle plate (350) is connected to the bottom wall of the biological trickling filter (200), the water receiving plate (330) guides sewage dripped on the water receiving plate (330) to the left side of the precipitation baffle plate (350), a water outlet pipe (310) is connected to the lower end of the right side of the biological trickling filter (200), the lower end of the overflow plate (340) is lower than the upper end of the precipitation baffle plate (350) so that floating foam in the sewage is blocked at the left side of the overflow plate (340), the precipitation baffle plate (350) is used for blocking solid impurities in the sewage and enabling the solid impurities to be precipitated at the left side of the precipitation baffle plate (350), so as to reduce solid impurities contained in the discharged sewage in the water outlet pipe (310), wherein the height of the working water level is equal to that of the sedimentation baffle (350).

9. A biofilter system according to claim 8, wherein: the water receiving plate (330) is obliquely arranged in the biological trickling filter (200), and the right end of the water receiving plate (330) is higher than the left end of the water receiving plate (330).

10. A biofilter system according to claim 1, wherein: the outlet pipe (310) is connected with middle pond (600), middle pond (600) are used for the process sewage after bio-trickling filter (200) are handled deposits, middle pond (600) are connected with constructed wetland (700).

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