A wastewater fixed film biological treatment system

Abstract

The present invention discloses a wastewater fixed film biological treatment system, which relates to the technical field of wastewater treatment, and includes a biofilm pool, in which a plurality of groups of biofilm disc mechanisms are installed, the biofilm disc mechanism includes a first support shaft and a second support shaft, a plurality of parallel arranged impurity removal discs are arranged between the first support shaft and the second support shaft, the impurity removal disc includes a first disc body and a second disc body, the second disc body is arranged around the first disc body, the first disc body carries an anaerobic bacterial group, the second disc body carries an aerobic bacterial group, and the top of the first disc body is lower than the liquid level in the biofilm pool. Thus, by placing aerobic bacterial groups and anaerobic bacterial groups in different areas of the impurity removal disc, the impurity removal disc can treat a variety of impurities in the wastewater, and the function of the entire mechanism is enriched.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a wastewater fixed-film biological treatment system. Background Art

[0002] The basic principle of biofilm method for treating wastewater is to use microorganisms to attach and grow on the filler base. In this process, the microorganisms will adsorb and degrade the impurities and metal salt ions in the wastewater, thereby completing the preliminary treatment of the wastewater. Existing treatment solutions include biofilters, biofilm discs, and biological fluidized beds. Among them, biofilm discs are widely used in the field of wastewater treatment due to their flexible design, controllable volume, and no need for aeration.

[0003] However, most existing biofilm disks carry a relatively single type of impurity-removing bacteria. If you want to treat a variety of impurities, you need to design multiple treatment pools to place biofilm disks carrying different microorganisms, but this will cause the volume of the entire wastewater treatment system to become larger. Summary of the invention

[0004] In view of the above defects, the purpose of the present invention is to provide a wastewater fixed film biological treatment system, aiming to solve the problem that the biofilm disk in the prior art has a relatively single function.

[0005] In order to solve the above technical problems, the technical solution of the present invention is:

[0006] A wastewater fixed film biological treatment system comprises a biofilm pool, wherein a plurality of biofilm disc mechanisms are installed in the biofilm pool, wherein the biofilm disc mechanisms comprise a first support shaft and a second support shaft, wherein a first bracket and a second bracket are respectively arranged at both ends of the biofilm pool, wherein the first support shaft is rotatably connected to the first bracket, and the second support shaft is rotatably connected to the second bracket;

[0007] A plurality of parallel arranged impurity removal disks are arranged between the first support shaft and the second support shaft, and the impurity removal disks include a first disk body and a second disk body, the second disk body is arranged around the first disk body, the first disk body carries anaerobic bacteria, the second disk body carries aerobic bacteria, and the top of the first disk body is lower than the liquid level in the biofilm pool.

[0008] Among them, the second disk body is annular, and the second disk body includes an outer ring wall and an inner ring wall, the outer ring wall is arranged around the inner ring wall, and the inner ring wall is arranged around the first disk body; the side wall of the first disk body is provided with an annular clamping platform, the clamping platform is provided with a first limiting hole, the inner ring wall is provided with a clamping ring, the clamping ring is provided with a second limiting hole matching the first limiting hole, and the first limiting hole and the second limiting hole are bolted.

[0009] Among them, a hollow first shaft body is provided at one end of the first disk body, a second shaft body is provided at the other end of the first disk body, a first flange is installed at the end of the first shaft body away from the first disk body, a second flange matching the first flange is provided on the outer wall of the second shaft body, the inner diameter of the first shaft body is larger than the outer diameter of the second shaft body, the adjacent second shaft bodies are plugged into the first shaft bodies, and the first flange is bolted to the second flange.

[0010] Among them, the first disk body is provided with a plurality of hollow areas, a first storage ball is installed in the hollow areas, a plurality of water inlet holes are provided on the side wall of the first storage ball, and anaerobic bacteria are stored in the first storage ball.

[0011] The first storage ball includes a first hemisphere and a second hemisphere, the first hemisphere is fixedly connected to the second hemisphere, and an end of the first hemisphere away from the second hemisphere and an end of the second hemisphere away from the first hemisphere are both rotatably connected to the first disk.

[0012] Among them, the first storage ball is provided with a resin protective layer, a medical stone coating, a basalt coating and a corrosion-resistant resin layer in sequence from the inside to the outside, the thickness of the resin protective layer is a, the thickness of the medical stone coating is b, the thickness of the basalt coating is c, the thickness of the corrosion-resistant resin layer is d, a:b:c:d=1:0.25-0.4:0.2-0.5:1.2-1.5.

[0013] A second storage ball is arranged inside the first storage ball, the structure of the second storage ball is the same as that of the first storage ball, the wall of the first storage ball is coated with aerobic bacteria, and the inner wall of the second storage ball is coated with anaerobic bacteria.

[0014] Among them, a plurality of support arms are arranged on the first disk body, and the support arms are arranged around the axis of the first disk body. Fixing holes are arranged on the support arms, and the fixing holes of the first disk body are arranged in cooperation with each other; the biofilm disk mechanism also includes a fixing rod, and the fixing rod passes through the fixing holes of the first disk body in sequence, a boss is arranged at one end of the fixing rod, and an external thread is arranged on the side wall of the other end of the fixing rod, the outer diameter of the boss is larger than the inner diameter of the fixing hole, and a nut is installed at the end of the fixing rod away from the boss.

[0015] Among them, a plurality of positioning areas are arranged on the second disk body, a plurality of third storage balls are arranged on the positioning areas, the third storage balls are rotatably connected to the positioning areas, a plurality of liquid inlets are arranged on the outer wall of the third storage balls, and aerobic bacteria are coated on the inner wall of the third storage balls.

[0016] After adopting the above technical solution, the beneficial effects of the present invention are:

[0017] First, by placing aerobic bacteria and anaerobic bacteria in different areas of the impurity removal disk, the impurity removal disk can handle a variety of impurities in the wastewater, enriching the function of the entire mechanism. Second, aerobic bacteria can consume oxygen in the wastewater, which assists the normal work of anaerobic bacteria. Third, the introduction of storage balls expands the breeding space of aerobic and anaerobic bacteria and improves their work efficiency. Fourth, the storage ball is composed of a resin protective layer, a medical stone coating, a basalt coating and a corrosion-resistant resin layer, which enables the storage ball itself to absorb metal ions, and the porous structure of the medical stone coating and the basalt coating also provides additional space for the reproduction of bacteria. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a wastewater fixed film biological treatment system;

[0019] Figure 2 It is the structural diagram of the biofilm disk mechanism;

[0020] Figure 3 This is a structural diagram of the debris removal disk;

[0021] Figure 4 is a structural diagram of the first disk;

[0022] Figure 5 is a structural diagram of the second disk;

[0023] Figure 6 A top view of the debris removal disc;

[0024] Figure 7 for Figure 4 A partial enlarged view of middle A;

[0025] Figure 8 This is the structural diagram of the first storage ball;

[0026] Fig. 9 is a partial cross-sectional view of the first storage ball;

[0027] Fig.10 for Figure 5 A partial enlarged view of B in the middle;

[0028] Fig.11 This is a structural diagram of another second disk.

[0029] In the figure: 1-biofilm pool, 11-first support, 12-second support;

[0030] 2-biofilm disc mechanism, 21-first support shaft, 22-second support shaft, 23-de-impurity disc, 24-first disc body, 241-first shaft body, 242-second shaft body, 243-first flange, 244-second flange, 245-hollow area, 246-first storage ball, 2461-water inlet, 247-first hemisphere, 248-second hemisphere, 249-second storage ball, 2410-aerobic bacteria, 2411- Resin protective layer, 2412-medical stone coating, 2413-basalt coating, 2414-corrosion-resistant resin layer, 25-second disk, 251-outer ring wall, 252-inner ring wall, 253-card table, 254-card ring, 255-first limiting hole, 256-second limiting hole, 257-support arm, 258-fixing hole, 259-positioning area, 2510-third storage ball, 2511-guide plate, 26-fixing rod;

[0031] 3-sliding track, 4-driving motor, 5-first cylinder. DETAILED DESCRIPTION

[0032] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0033] Example:

[0034] like Figure 1-11 As shown, a wastewater fixed film biological treatment system includes a biofilm pool 1, in which a plurality of groups of biofilm disc mechanisms 2 are installed, the biofilm disc mechanism 2 includes a first support shaft 21 and a second support shaft 22, and a first bracket 11 and a second bracket 12 are respectively arranged at both ends of the biofilm pool 1, the first support shaft 21 is rotatably connected to the first bracket 11, and the second support shaft 22 is rotatably connected to the second bracket 12. This design enables the flowing wastewater to drive the biofilm disc mechanism 2 to rotate, so that the bacterial colonies at different positions of the membrane disc can all contact with the wastewater and decompose the impurities in the wastewater.

[0035] The existing biofilm disc mechanism 2 often only carries one kind of bacterial community, which makes the function of the whole mechanism relatively simple. For this reason, this scheme chooses to place different bacterial communities on the biofilm disc mechanism 2 so that it can decompose multiple substances in the wastewater at the same time. For this reason, a number of parallel arranged impurity removal discs 23 are arranged between the first support shaft 21 and the second support shaft 22. The impurity removal disc 23 includes a first disc body 24 and a second disc body 25. The second disc body 25 is arranged around the first disc body 24. The first disc body 24 carries an anaerobic bacterial community, and the second disc body 25 carries an aerobic bacterial community 2410. The top of the first disc body 24 is lower than the liquid level in the biofilm pool 1. In order to ensure the normal operation of the anaerobic bacterial community, we should try to avoid its contact with oxygen. For this reason, the first disc body 24 should be placed below the wastewater liquid level. In order to facilitate the work of the aerobic bacterial community 2410, we need to keep it in contact with the air. Therefore, part of the second disc body 25 needs to be above the wastewater liquid level. Since the water flow drives the biofilm disc mechanism 2 to rotate, different areas of the second disc body 25 can reach above the wastewater surface during the rotation process, so that the aerobic bacteria 2410 can obtain oxygen. The aerobic bacteria 2410 still need to breathe when they are under the water surface. At this time, the aerobic bacteria 2410 will consume the oxygen in the wastewater, which will cause the oxygen in the wastewater to drop rapidly, providing conditions for the normal operation of the anaerobic bacteria.

[0036] In order to facilitate the first disk body 24 to be located below the wastewater liquid surface and a part of the second disk body 25 to be located above the wastewater liquid surface, the height of the biofilm disk mechanism 2 in this solution is to be lower than the depth of the biofilm pool 1, and the first support shaft 21 and the second support shaft 22 of the biofilm disk mechanism 2 both pass through the side wall of the biofilm pool 1, and then the first support shaft 21 is rotatably connected to the first bracket 11, and the second support shaft 22 is rotatably connected to the second bracket 12. In order to avoid water leakage, the first support shaft 21, the second support shaft 22 and the biofilm pool 1 are rotatably connected while being sealed.

[0037] In order to facilitate the installation of the second plate 25 on the first plate 24, as shown in FIG. Figure 3-5As shown, the second disk body 25 is annular, and includes an outer annular wall 251 and an inner annular wall 252, wherein the outer annular wall 251 is arranged around the inner annular wall 252, and the inner annular wall 252 is arranged around the first disk body 24; the side wall of the first disk body 24 is provided with an annular clamping platform 253, the clamping platform 253 is provided with a first limiting hole 255, the inner annular wall 252 is provided with a clamping ring 254, the clamping ring 254 is provided with a second limiting hole 256 matching the first limiting hole 255, and the first limiting hole 255 and the second limiting hole 256 are connected by bolts. The clamping platform 253 is aligned with the clamping ring 254, and the end of the clamping ring 254 away from the second disk body 25 abuts against the outer wall of the first disk body 24, and at the same time, the end of the clamping platform 253 away from the first disk body 24 abuts against the inner annular wall 252, and finally the two are fixed by bolts.

[0038] like Figure 6 As shown, in order to facilitate the connection of several first disk bodies 24, a hollow first shaft body 241 is provided at one end of the first disk body 24, a second shaft body 242 is provided at the other end of the first disk body 24, a first flange 243 is installed at one end of the first shaft body 241 away from the first disk body 24, a second flange 244 matching the first flange 243 is provided on the outer wall of the second shaft body 242, the inner diameter of the first shaft body 241 is larger than the outer diameter of the second shaft body 242, the adjacent second shaft bodies 242 are plugged with the first shaft body 241, and the first flange 243 is bolted with the second flange 244. When in use, the second shaft body 242 of the first first disk body 24 is inserted into the first shaft body 241 of the second first disk body 24, when the second shaft body 242 reaches a certain depth, the first flange 243 abuts against the second flange 244, at this time, the first flange 243 and the second flange 244 are fixed by bolts, and the two first disk bodies 24 are combined into one, and then the remaining first disk bodies 24 are assembled in sequence according to the above method. It is worth noting that the first shaft body 241 and the second shaft body 242 of the first plate body 24 located at both ends are fixedly connected to the first support shaft 21 and the second support shaft 22 respectively.

[0039] like Figure 3 , Figure 7 As shown, in order to facilitate the placement of the anaerobic bacteria on the first plate 24, the first plate 24 is provided with a plurality of hollow areas 245, in which a first storage ball 246 is installed, and a plurality of water inlet holes 2461 are provided on the side wall of the first storage ball 246, and the anaerobic bacteria are stored in the first storage ball 246. The interior of the first storage ball 246 is a curved surface, which allows the anaerobic bacteria to obtain a larger breeding space and, at the same time, to contact with the wastewater to the greatest extent.

[0040] like Figure 8-9As shown, in order to facilitate the placement of anaerobic bacteria, the first storage ball 246 includes a first hemisphere 247 and a second hemisphere 248, wherein the first hemisphere 247 and the second hemisphere 248 are fixedly connected, and the end of the first hemisphere 247 away from the second hemisphere 248 and the end of the second hemisphere 248 away from the first hemisphere 247 are both rotatably connected to the first disk 24. When in use, it is necessary to evenly apply the anaerobic bacteria to the inner walls of the first hemisphere 247 and the second hemisphere 248, or to set an additional culture medium in the first storage ball 246 and place the anaerobic bacteria on the culture medium. The first storage ball 246 can be rotatably set on the first disk 24. This design enables the first storage ball 246 to be driven by the water flow to rotate when the first disk 24 rotates, which will cause the inactivated bacteria inside to be thrown into the wastewater, leaving space for subsequent bacterial reproduction.

[0041] The bacterial flora can decompose impurities in the wastewater, but it cannot absorb metal salt ions. In order to preliminarily remove heavy metal ions in the wastewater, the first storage ball 246 is provided with a resin protective layer 2411, a medical stone coating 2412, a basalt coating 2413 and a corrosion-resistant resin layer 2414 from the inside to the outside, the thickness of the resin protective layer 2411 is a, the thickness of the medical stone coating 2412 is b, the thickness of the basalt coating 2413 is c, the thickness of the corrosion-resistant resin layer 2414 is d, a:b:c:d=1:0.25-0.4:0.2-0.5:1.2-1.5. Since a number of water inlet holes 2461 are arranged on the side wall of the first storage ball 246, the medical stone coating 2412 and the basalt coating 2413 can be exposed to the wastewater. Due to the porous material of the medical stone coating 2412 and the basalt coating 2413, sufficient space is provided for the reproduction of bacteria. At the same time, the medical stone coating 2412 can absorb heavy metal ions, so that the heavy metal ions in the wastewater can be effectively removed.

[0042] In order to further expand the surface area of ​​the first storage ball 246, the resin protection layer 2411 and the corrosion-resistant resin layer 2414 both have a plurality of concave and convex surfaces.

[0043] Although the aerobic bacteria 2410 on the second disk body 25 can consume oxygen in the wastewater, the biofilm disk mechanism 2 will continuously send outside air into the wastewater when it rotates, which causes the wastewater to continuously replenish oxygen. In order to further consume this part of oxygen, a second storage ball 249 is arranged inside the first storage ball 246. The structure of the second storage ball 249 is the same as that of the first storage ball 246. The inner wall of the first storage ball 246 is coated with aerobic bacteria 2410, and the inner wall of the second storage ball 249 is coated with anaerobic bacteria. The aerobic bacteria 2410 in the first storage ball 246 can effectively absorb the oxygen entering the first storage ball 246, which provides a guarantee for the normal operation of the anaerobic bacteria in the second storage ball 249.

[0044] Preferably, the resin protective layer 2411 is an elastic layer, the purpose of which is to protect the second storage ball 249.

[0045] In order to further fix the first disk bodies 24, the first disk bodies 24 are provided with a plurality of support arms 257, the support arms 257 are arranged around the axis of the first disk body 24, the support arms 257 are provided with fixing holes 258, and the fixing holes 258 of the first disk bodies 24 are arranged in cooperation with each other; the biofilm disk mechanism 2 also includes a fixing rod 26, the fixing rod 26 passes through the fixing holes 258 of the first disk bodies 24 in sequence, a boss is provided at one end of the fixing rod 26, an external thread is provided on the side wall of the other end of the fixing rod 26, the outer diameter of the boss is larger than the inner diameter of the fixing hole 258, and a nut is installed at the end of the fixing rod 26 away from the boss.

[0046] like Fig.10 As shown, in order to facilitate the placement of aerobic bacteria 2410 on the second disk 25, a plurality of positioning areas 259 are provided on the second disk 25, and a plurality of third storage balls 2510 are provided on the positioning areas 259. The third storage balls 2510 are rotatably connected to the positioning areas 259, and a plurality of liquid inlets are provided on the outer wall of the third storage balls 2510. The inner wall of the third storage balls 2510 is coated with aerobic bacteria 2410. The structure of the third storage balls 2510 is the same as that of the first storage balls 246, except that the volume of the third storage balls 2510 is larger than that of the first storage balls 246, and the purpose is to increase the breeding space of the aerobic bacteria 2410 and accelerate the oxygen consumption and impurity decomposition rate in the wastewater.

[0047] like Fig.11 As shown, in order to facilitate the wastewater to drive the biofilm disk mechanism 2 to rotate, a plurality of guide vanes 2511 are arranged around the outer ring wall 251. The guide vanes 2511 are arc-shaped and located at the bottom of the second disk body 25. The convex surface of the guide vane 2511 faces the direction of water flow.

[0048] During the initial flow of wastewater, due to its force limitation, it is difficult to directly drive the biofilm disc mechanism 2 to rotate. At this time, it is necessary to use external force to drive the biofilm disc mechanism 2 to rotate. For this purpose, a sliding track 3 is provided on the side of the first bracket 11 away from the biofilm disc mechanism 2, and a driving motor 4 is slidingly provided on the sliding track 3. A first cylinder 5 is installed on the end of the sliding track 3 away from the first bracket 11. The telescopic end of the first cylinder 5 is connected to the driving motor 4, and the power end of the driving motor 4 is matched with the first support shaft 21. When in use, the first cylinder 5 drives the driving motor 4 to move along the slide rail toward the first support shaft 21, and then the power end of the driving motor 4 is connected to the power of the first support shaft 21, and then the driving motor 4 is started, and the power end of the driving motor 4 will drive the biofilm disc mechanism 2 to rotate.

[0049] There are many ways to connect the power in the above process, such as plugging.

[0050] In summary, this solution has the following advantages: First, by placing aerobic bacteria 2410 and anaerobic bacteria in different areas of the impurity removal disc 23, the impurity removal disc 23 can process various impurities in the wastewater, enriching the function of the entire mechanism. Second, the aerobic bacteria 2410 can consume oxygen in the wastewater, which assists the normal work of the anaerobic bacteria. Third, the introduction of the storage ball expands the breeding space of the aerobic bacteria 2410 and the anaerobic bacteria, and improves their work efficiency. Fourth, the storage ball is composed of a resin protective layer 2411, a medical stone coating 2412, a basalt coating 2413 and a corrosion-resistant resin layer 2414, which enables the storage ball itself to adsorb metal ions, and the porous structure of the medical stone coating 2412 and the basalt coating 2413 also provides additional space for the reproduction of the flora.

[0051] The present invention is not limited to the above-mentioned specific implementation modes. Various changes made by ordinary technicians in this field based on the above-mentioned concepts without creative work are all within the protection scope of the present invention.

Claims

1. A wastewater fixed film biological treatment system, characterized in that: The invention comprises a biofilm pool (1), wherein a plurality of groups of biofilm disc mechanisms (2) are installed in the biofilm pool (1), wherein the biofilm disc mechanisms (2) comprise a first support shaft (21) and a second support shaft (22), wherein a first bracket (11) and a second bracket (12) are respectively arranged at two ends of the biofilm pool (1), wherein the first support shaft (21) is rotatably connected to the first bracket (11), and the second support shaft (22) is rotatably connected to the second bracket (12); A plurality of debris removal discs (23) arranged in parallel are arranged between the first support shaft (21) and the second support shaft (22), the debris removal discs (23) comprising a first disc body (24) and a second disc body (25), the second disc body (25) being arranged around the first disc body (24), the first disc body (24) carrying an anaerobic bacterial group, the second disc body (25) carrying an aerobic bacterial group (2410), the top of the first disc body (24) being lower than the liquid level in the biofilm pool (1).

2. The wastewater fixed film biological treatment system according to claim 1, characterized in that: The second disk body (25) is annular, and comprises an outer annular wall (251) and an inner annular wall (252); the outer annular wall (251) is arranged around the inner annular wall (252), and the inner annular wall (252) is arranged around the first disk body (24); a side wall of the first disk body (24) is provided with an annular clamping platform (253), a first limiting hole (255) is provided on the clamping platform (253), a clamping ring (254) is provided on the inner annular wall (252), a second limiting hole (256) matching the first limiting hole (255) is provided on the clamping ring (254), and the first limiting hole (255) and the second limiting hole (256) are connected by bolts.

3. The wastewater fixed film biological treatment system according to claim 2, characterized in that: A hollow first shaft (241) is disposed at one end of the first disk body (24), a second shaft (242) is disposed at the other end of the first disk body (24), a first flange (243) is installed at one end of the first shaft (241) away from the first disk body (24), a second flange (244) matching with the first flange (243) is disposed on the outer wall of the second shaft (242), the inner diameter of the first shaft (241) is larger than the outer diameter of the second shaft (242), the adjacent second shafts (242) are plugged into the first shaft (241), and the first flange (243) is bolted to the second flange (244).

4. The wastewater fixed film biological treatment system according to claim 1, characterized in that: The first disk body (24) is provided with a plurality of hollow areas (245), a first storage ball (246) is installed in the hollow areas (245), a plurality of water inlet holes (2461) are provided on the side wall of the first storage ball (246), and anaerobic bacteria are stored in the first storage ball (246).

5. The wastewater fixed film biological treatment system according to claim 4, characterized in that: The first storage ball (246) comprises a first hemisphere (247) and a second hemisphere (248); the first hemisphere (247) and the second hemisphere (248) are fixedly connected; an end of the first hemisphere (247) away from the second hemisphere (248) and an end of the second hemisphere (248) away from the first hemisphere (247) are both rotatably connected to the first disk (24).

6. The wastewater fixed film biological treatment system according to claim 5, characterized in that: The first storage ball (246) is provided with a resin protective layer (2411), a medical stone coating (2412), a basalt coating (2413) and a corrosion-resistant resin layer (2414) in sequence from the inside to the outside, the thickness of the resin protective layer (2411) is a, the thickness of the medical stone coating (2412) is b, the thickness of the basalt coating (2413) is c, and the thickness of the corrosion-resistant resin layer (2414) is d, and a:b:c:d=1:0.25-0.4:0.2-0.5:1.2-1.

5.

7. The wastewater fixed film biological treatment system according to claim 6, characterized in that: A second storage ball (249) is arranged inside the first storage ball (246); the structure of the second storage ball (249) is the same as that of the first storage ball (246); the wall of the first storage ball (246) is coated with aerobic bacteria (2410), and the inner wall of the second storage ball (249) is coated with anaerobic bacteria.

8. The wastewater fixed film biological treatment system according to claim 2, characterized in that: A plurality of support arms (257) are provided on the first disk body (24), the support arms (257) are arranged around the axis of the first disk body (24), and a fixing hole (258) is provided on the support arms (257), and the fixing holes (258) of the plurality of first disk bodies (24) are arranged in cooperation with each other; the biofilm disk mechanism (2) further comprises a fixing rod (26), the fixing rod (26) passes through the fixing holes (258) of the plurality of first disk bodies (24) in sequence, a boss is provided at one end of the fixing rod (26), an external thread is provided on the side wall of the other end of the fixing rod (26), the outer diameter of the boss is larger than the inner diameter of the fixing hole (258), and a nut is installed at the end of the fixing rod (26) away from the boss.

9. The wastewater fixed film biological treatment system according to claim 1, characterized in that: The second disk body (25) is provided with a plurality of positioning areas (259), the positioning areas (259) are provided with a plurality of third storage balls (2510), the third storage balls (2510) are rotatably connected to the positioning areas (259), a plurality of liquid inlets are provided on the outer wall of the third storage balls (2510), and the inner wall of the third storage balls (2510) is coated with aerobic bacteria (2410).

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