Biological filter tank sewage treatment system

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a biological filter tank sewage treatment system which comprises a settling pond, a biological filter tank and an ecological treatment pond, the sedimentation tank is used for depositing solid impurities; a pebble layer is laid at the bottom of the biological filter tank, an outlet of the filter tank is communicated with an internal gap of the pebble layer, a supporting plate is fixedly arranged on the upper side of the pebble layer, a net frame with an opening is arranged on the supporting plate, the net frame is filled with a purification matrix, a cavity exists between the supporting plate and the pebble layer, and an air inlet and an air outlet are formed in the biological filter tank. The air inlet is communicated with the cavity; the ecological treatment pond is provided with a water inlet and a water outlet, the outlet of the filter tank is communicated with the water inlet, and vegetation is planted on the ecological treatment pond. Aiming at the technical problem that the existing constructed wetland has use defects, the utility model can realize rapid replacement of the substrate when the substrate is blocked after long-term operation by separating the substrate purification process from the vegetation purification process, thereby reducing the influence of substrate blocking treatment on sewage treatment.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a biological filter tank sewage treatment system. Background Art

[0002] Constructed wetlands are a type of sewage ecological treatment system that consists of a shallow water system planted with aquatic plants. They mainly rely on natural biological, physical and chemical processes to achieve sewage purification, including engineering structures that control flow direction, liquid retention time and water level. Existing constructed wetlands include horizontal flow constructed wetlands, subsurface flow constructed wetlands, vertical subsurface flow constructed wetlands, horizontal subsurface flow constructed wetlands, ditch-type constructed wetlands, etc. Conventional constructed wetlands achieve water purification by filling purification matrix at the bottom and configuring plants on the top.

[0003] During the operation of artificial wetlands, substrate blockage is one of the most common problems. The blockage problem is usually solved by measures such as in-situ cleaning, ex-situ cleaning or replacement of the substrate. These existing technical measures are time-consuming and will affect the normal operation of the wetland, thereby affecting the efficiency of sewage treatment. Utility Model Content

[0004] In view of the technical problem that existing artificial wetlands have defects in use, the utility model provides a biological filter tank sewage treatment system, which is easy to install and can achieve rapid replacement of blocked substrates, thereby reducing the impact of substrate blockage on sewage treatment.

[0005] The technical scheme provided by the utility model is as follows: a biological filter tank sewage treatment system, comprising a sedimentation tank, a biological filter tank and an ecological treatment tank; the sedimentation tank is provided with a water inlet and a water outlet, and the sedimentation tank is used to deposit solid impurities; the biological filter tank is provided with at least one, the water outlet of the sedimentation tank is communicated with the top of the biological filter tank, a delivery pump is provided on the communication path between the sedimentation tank and the biological filter tank, a pebble layer is laid on the bottom of the biological filter tank, a filter tank outlet is provided on the biological filter tank, the filter tank outlet is communicated with the internal gap of the pebble layer, a support plate is fixedly provided on the upper side of the pebble layer, a net frame with an opening is provided on the support plate, a purification matrix is ​​filled in the net frame, a cavity exists between the support plate and the pebble layer, an air inlet and an air outlet are provided on the biological filter tank, the air inlet is communicated with the cavity, and the air outlet is higher than the purification matrix; the ecological treatment tank is provided with a water inlet and a drain, the filter tank outlet is communicated with the water inlet, and vegetation is planted on the ecological treatment tank.

[0006] Optionally, the water inlet and the water outlet are respectively arranged on both sides of the sedimentation tank, the bottom of the sedimentation tank is inclined from the water inlet to the water outlet, a mud collecting trough is provided at the lowest point of the bottom of the sedimentation tank, the mud collecting trough is connected to a sewage pipe, and a sewage pump is provided on the connecting path between the mud collecting trough and the sewage pipe.

[0007] Optionally, at least one grid is provided in the inner area of ​​the tank body between the water inlet and the water outlet of the sedimentation tank, and there is a gap between the bottom of the grid and the bottom of the sedimentation tank.

[0008] Optionally, the ecological treatment pool is provided with spaced and staggered partitions, and the partitions form a curved flow channel in the pool area of ​​the ecological treatment pool.

[0009] Optionally, the opening is arranged at the top, bottom or side of the screen frame.

[0010] Optionally, a closed door is provided on the mesh frame near the opening.

[0011] Optionally, a geotextile is laid between the mesh frame and the purification matrix.

[0012] Optionally, a hook is provided on the net frame.

[0013] Optionally, the top of the sedimentation tank is covered with a cover plate, and the cover plate is movably matched with the sedimentation tank.

[0014] Beneficial Effects

[0015] The technical solution provided by the utility model has the following beneficial effects compared with the prior art: in view of the technical problem of defects in the use of existing artificial wetlands, the biological filter tank sewage treatment system proposed by the utility model can achieve rapid replacement of the substrate when the substrate is blocked after long-term operation by separating the substrate purification and vegetation purification processes, thereby reducing the impact of substrate blockage on sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the sedimentation tank and biological filter tank proposed in the embodiment of the utility model.

[0017] Figure 2 This is one of the structural schematic diagrams of the ecological treatment pool proposed in the embodiment of the utility model.

[0018] Figure 3 This is the second structural schematic diagram of the ecological treatment pool proposed in the embodiment of the utility model.

[0019] Figure 4 This is a schematic diagram of the structure of the screen frame proposed in the embodiment of the utility model.

[0020] Figure 5 This is a schematic diagram of the implementation of the biological filter tank sewage treatment system proposed in the embodiment of the utility model. DETAILED DESCRIPTION

[0021] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.

[0022] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings. The words "first", "second", etc. described in the present utility model are set for the convenience of describing the technical solution of the present utility model, and have no specific limiting effect. They are all general references and do not constitute a limiting effect on the technical solution of the present utility model. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Multiple technical solutions in the same embodiment, and multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not have contradictions or conflicts, all of which are within the scope of protection required by the present utility model.

[0023] Example 1

[0024] Combined with Figure 1-5The present embodiment proposes a biological filter tank sewage treatment system, including a sedimentation tank 10, a biological filter tank 20 and an ecological treatment tank 30; the sedimentation tank 10 is provided with a water inlet 101 and a water outlet 102, and the sedimentation tank 10 is used to deposit solid impurities; the biological filter tank 20 is provided with at least one, the water outlet 102 of the sedimentation tank 10 is connected to the top of the biological filter tank 20, a delivery pump 100 is provided on the communication path between the sedimentation tank 10 and the biological filter tank 20, a pebble layer 200 is laid on the bottom of the biological filter tank 20, and a filter tank outlet 201 is provided on the biological filter tank 20, and the filter tank outlet 201 is connected to the inner surface of the pebble layer 200. The gaps are connected, a support plate 202 is fixedly arranged on the upper side of the pebble layer 200, a mesh frame 203 with an opening is arranged on the support plate 202, the mesh frame 203 is filled with a purification matrix 204, a cavity 205 is provided between the support plate 202 and the pebble layer 200, an air inlet 206 and an air outlet 207 are arranged on the biological filter tank 20, the air inlet 206 is connected with the cavity 205, and the air outlet 207 is higher than the purification matrix 204; a water inlet 300 and a drain outlet 301 are arranged on the ecological treatment pool 30, the filter tank outlet 201 is connected with the water inlet 300, and vegetation 302 is planted on the ecological treatment pool 30.

[0025] In response to the technical problem of defects in the use of existing artificial wetlands, the biological filter tank sewage treatment system proposed in this embodiment can achieve rapid replacement of the purification matrix 204 when the purification matrix 204 is blocked after long-term operation by separating the matrix purification and vegetation purification processes, thereby reducing the impact of the blockage of the purification matrix 204 on sewage treatment.

[0026] In the biological filter tank sewage treatment system of this embodiment, the sedimentation tank 10 is generally located below the ground, and the sewage enters from the water inlet 101. After the floating garbage and fine particulate matter are removed from the sedimentation tank 10, the sewage flows out from the water outlet 102 and enters one or more biological filter tanks 20 under the action of the delivery pump 100. After nitrification and denitrification in the biological filter tank 20, it enters the ecological treatment tank 30 and is discharged after being purified by plants in the ecological treatment tank 30.

[0027] For the biofilter tank 20 of the present embodiment, it is generally a cylindrical tank body, and it can also be other shapes. In the biofilter tank 20, a mesh frame 203 adapted to the shape of the biofilter tank 20 is placed above the support plate 202, and the purification matrix 204 is filled in the mesh frame 203, and the bottom of the support plate 202 is higher than the air inlet 206. The sewage moves downward in the vertical direction in the gap of the purification matrix 204. At the same time, air is filled into the bottom of the biofilter tank 20 through the air inlet 206, and the air can move upward in the vertical direction. The inflation method is preferably intermittent. During the inflation process, the surrounding of the purification matrix 204 is in an oxygen-rich environment, which is conducive to nitrification reaction and converting ammonia nitrogen into nitrate nitrogen. In the non-inflation process, the surrounding of the purification matrix 204 is in an oxygen-deficient environment, which is conducive to denitrification reaction, and then converting nitrate nitrogen into nitrogen. The air and nitrogen filled in can eventually be discharged from the outlet 207. After passing through the purification matrix 204, the sewage enters the pebble layer 200 at the bottom of the biological filter tank 20, and is further filtered and discharged from the filter tank outlet 201. Obviously, since the purification matrix 204 is arranged in the biological filter tank 20 through the mesh frame 203, when the purification matrix 204 is blocked, the purification matrix 204 can be directly replaced or flushed by taking out the mesh frame 203, thereby solving the problem of the blockage of the purification matrix 204 very conveniently, and if the purification matrix 204 is replaced in time, the treatment process will hardly affect the efficiency and continuity of sewage treatment.

[0028] The purification matrix 204 is generally a mixture of zeolite and gravel. In a preferred embodiment, the mixing ratio of zeolite to gravel is 1:3. In an optional embodiment, the mesh frame 203 can be a steel wire mesh frame 203 .

[0029] The sewage purified by the biological filter tank 20 enters the ecological treatment pool 30. For the ecological treatment pool 30 of this embodiment, specifically, the sewage enters through the water inlet 300 at the bottom of the ecological treatment pool 30, and the sewage can contact the plant root system to achieve the purification effect. Finally, the purified sewage can enter the natural water system or land through the drain outlet 301 of the ecological treatment pool 30.

[0030] The main body of the ecological treatment pool 30 can be located below the ground, and the plants planted in the ecological treatment pool 30 can improve the landscape. Preferably, the vegetation 302 can be selected from one or more of Acorus calamus, Cattail, and Phragmites australis.

[0031] In an optional embodiment, the water inlet 101 and the water outlet 102 are respectively arranged on both sides of the sedimentation tank 10, the bottom of the sedimentation tank 10 is inclined from the water inlet 101 to the water outlet 102, a sludge collecting tank 208 is arranged at the lowest height of the bottom of the sedimentation tank 10, the sludge collecting tank 208 is connected to a sewage pipe 209, and a sewage pump 210 is arranged on the communication path between the sludge collecting tank 208 and the sewage pipe 209. In this embodiment, since the bottom of the sedimentation tank 10 is a slope, the sewage will naturally flow from the water inlet 101 to the water outlet 102, and during the flow process, solid impurities such as sludge will naturally deposit in the sludge collecting tank 208, and the sediment in the sludge collecting tank 208 can be regularly sucked and cleaned by the sewage pump 210.

[0032] In a further embodiment, at least one grid 211 is provided in the internal area of ​​the sedimentation tank 10 between the water inlet 300 and the water outlet 102, and there is a gap between the bottom of the grid 211 and the bottom of the sedimentation tank 10. In this embodiment, by providing the grid 211 in the middle of the sedimentation tank 10, floating garbage in the sewage can be intercepted. And because there is still a gap between the bottom of the grid 211 and the bottom of the sedimentation tank 10, it will not affect the sedimentation sludge from entering the sludge collecting tank 208 through the inclined bottom of the tank.

[0033] For the ecological treatment pool 30, in some embodiments, staggered partitions 303 are provided in the ecological treatment pool 30, and the partitions 303 form a curved flow path in the pool area of ​​the ecological treatment pool 30. In this embodiment, the movement path of the sewage in the ecological treatment pool 30 can be "S"-shaped or other curved forms, thereby extending the movement distance of the sewage, increasing the contact time between the sewage and the plant roots, and thus improving the purification effect.

[0034] For the screen frame 203, in an optional embodiment, the opening on the screen frame 203 can be set at the top, bottom or side of the screen frame 203, so as to facilitate cleaning, loading and unloading or filling the purification matrix 204 in the screen frame 203. In a further embodiment, a closed door can be provided near the opening on the screen frame 203 to prevent the purification matrix 204 from leaking out.

[0035] Furthermore, since the structure of the net frame 203 has dense meshes, the purification matrix 204 may leak out. Therefore, in some embodiments, a geotextile is laid between the net frame 203 and the purification matrix 204, and the geotextile can effectively prevent the purification matrix 204 from leaking out through the meshes.

[0036] In the event that the purification matrix 204 is clogged, the mesh frame 203 needs to be removed from the biofilter tank 20. In some embodiments, a hook 212 is provided on the mesh frame 203, for example, a hook 212 is provided on the top of the mesh frame 203, which can facilitate lifting by lifting equipment, thereby further improving the convenience of use.

[0037] In some embodiments, the top of the sedimentation tank 10 is covered with a cover plate 103, and the cover plate 103 is movably matched with the sedimentation tank 10. Since the sedimentation tank 10 is generally buried underground, in this embodiment, the top of the sedimentation tank 10 can be flush with the ground, and a movable cover plate 103 is provided on the top, so as to facilitate the cleaning of floating garbage and sediment in the sedimentation tank 10.

[0038] Based on the above description, it can be known that the biological filter tank sewage treatment system of this embodiment, through the separation matrix purification and vegetation 302 purification process, uses the biological filter tank 20 to fill the purification matrix 204, and uses the ecological treatment pool 30 to plant the vegetation 302. When treating sewage, the sewage is first purified by the biological filter tank 20, and then enters the ecological treatment pool 30; and then discharged after purification in the ecological treatment pool 30. Therefore, when the system is running for a long time and the purification matrix 204 is blocked, the net frame 203 in the biological filter tank 20 for filling the purification matrix 204 can be taken out and replaced with a new net frame 203 filled with the purification matrix 204, so as to achieve overall replacement, so that the treatment process has almost no effect on the efficiency and continuity of sewage treatment.

[0039] Combined with Figure 5 The following is an example of a feasible layout of a biological filter tank sewage treatment system. The entire system can be arranged in conjunction with a warehouse. Among them, the biological filter tanks 20 can be uniformly placed on both sides of the warehouse, with each side corresponding to a water inlet pipe. The warehouse is provided with entrances and exits for easy daily maintenance and overhaul. The ecological treatment tank 30 is located around the warehouse. The sewage enters the biological filter tank 20 along the pipeline from the sedimentation tank 10, and the purified sewage enters the ecological treatment tank 30 from the bottom of the biological filter tank 20 along the pipeline. In order to avoid mutual interference between the sewage transported by the pipeline, an impermeable partition is set in the ecological treatment tank 30, and the sewage transported by the pipeline enters the ecological treatment tank 30 on both sides of the impermeable partition and is finally discharged separately.

[0040] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creative design without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A biological filter tank sewage treatment system, characterized in that: It includes a sedimentation tank (10), a biological filter tank (20) and an ecological treatment tank (30); The sedimentation tank (10) is provided with a water inlet (101) and a water outlet (102), and the sedimentation tank (10) is used to deposit solid impurities; The biological filter tank (20) is provided with at least one, the water outlet (102) of the sedimentation tank (10) is communicated with the top of the biological filter tank (20), a delivery pump (100) is provided on the communication path between the sedimentation tank (10) and the biological filter tank (20), a pebble layer (200) is laid on the bottom of the biological filter tank (20), a filter tank outlet (201) is provided on the biological filter tank (20), the filter tank outlet (201) is communicated with the internal gap of the pebble layer (200), and the pebble layer (200) ) is fixedly provided on the upper side of the biological filter tank (20), a mesh frame (203) with an opening is provided on the support plate (202), a purification matrix (204) is filled in the mesh frame (203), a cavity (205) is provided between the support plate (202) and the pebble layer (200), an air inlet (206) and an air outlet (207) are provided on the biological filter tank (20), the air inlet (206) is communicated with the cavity (205), and the air outlet (207) is higher than the purification matrix (204); The ecological treatment pool (30) is provided with a water inlet (300) and a water outlet (301), the filter tank outlet (201) is connected to the water inlet (300), and vegetation (302) is planted on the ecological treatment pool (30).

2. A biological filter tank sewage treatment system according to claim 1, characterized in that: The water inlet (101) and the water outlet (102) are respectively arranged on both sides of the sedimentation tank (10); the bottom of the sedimentation tank (10) is inclined from the water inlet (101) toward the water outlet (102); a mud collecting trough (208) is arranged at the lowest point of the bottom of the sedimentation tank (10); the mud collecting trough (208) is connected to a sewage pipe (209); and a sewage pump (210) is arranged on the communication path between the mud collecting trough (208) and the sewage pipe (209).

3. A biological filter tank sewage treatment system according to claim 2, characterized in that: At least one grid (211) is provided in the internal area of ​​the sedimentation tank (10) between the water inlet (300) and the water outlet (102), and a gap exists between the bottom of the grid (211) and the bottom of the sedimentation tank (10).

4. A biological filter tank sewage treatment system according to claim 1, characterized in that: The ecological treatment pool (30) is provided with spaced and staggered partitions (303), and the partitions (303) form a bent flow channel in the pool area of ​​the ecological treatment pool (30).

5. The biological filter tank sewage treatment system according to claim 1, characterized in that: The opening is arranged at the top, bottom or side of the screen frame (203).

6. A biological filter tank sewage treatment system according to claim 5, characterized in that: A closed door is provided on the screen frame (203) near the opening.

7. A biological filter tank sewage treatment system according to claim 1, characterized in that: A geotextile is laid between the mesh frame (203) and the purification matrix (204).

8. The biological filter tank sewage treatment system according to claim 1, characterized in that: The net frame (203) is provided with a hook (212).

9. A biological filter tank sewage treatment system according to claim 1, characterized in that: The top of the sedimentation tank (10) is covered with a cover plate (103), and the cover plate (103) is movably matched with the sedimentation tank (10).

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