Microbial sewage treatment device with pretreatment function

Abstract

The invention discloses a microbial sewage treatment device with a pretreatment function, and relates to the field of wastewater treatment, in particular to a settling pond for removing large-particle impurities in sewage and allowing the sewage to settle, the upper part of the settling pond is open, the settling pond is provided with a partition plate which is lower than the settling pond, and one side of the partition plate is provided with a first settling chamber; a filter screen is arranged at the upper end of the first precipitation chamber and is arranged in an elastic lifting manner in the height direction of the first precipitation chamber. By arranging the sedimentation tank, the treatment tank and the structures such as the partition plate, the filter screen and the overflow hole in the sedimentation tank, large-particle impurities in sewage can be effectively removed, interference to subsequent treatment links is reduced, and the sewage can be more efficiently purified and treated by microbiological treatment particles in a filter cotton plate after entering the treatment tank; therefore, the treatment efficiency of the whole sewage treatment device is improved, and the problems of slow recovery and low efficiency of the A / O biochemical system are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wastewater treatment, in particular to a microbial wastewater treatment device with pretreatment function. BACKGROUND

[0002] In the screening of biological bacteria, the wastewater treatment device is usually responsible for the treatment of production wastewater and domestic wastewater of the whole plant, and the treated water is sent back to the water using device or discharged; the A / O biochemical system is usually used in the wastewater treatment device to treat the wastewater, but the A / 0 biochemical system recovers slowly, and the efficiency is low due to the impact of a large amount of particulate matter in the wastewater and the wastewater, and the biological bacteria are prone to large-area death or inactivation, so a large amount of bacterial agents are usually purchased to compensate for the lack of effective bacteria in the treatment of wastewater and enhance the activity, but the cost is high.

[0003] Therefore, it is necessary to provide a microbial wastewater treatment device with pretreatment function to solve the above problems. SUMMARY

[0004] The present application aims to provide a microbial wastewater treatment device with pretreatment function to solve the problems of high cost and impact of a large amount of particulate matter in the wastewater and the wastewater.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a microbial wastewater treatment device with pretreatment function, comprising: A sedimentation tank for removing large particle impurities in wastewater and providing wastewater sedimentation, the sedimentation tank is open at the upper part, and the sedimentation tank has a partition plate with a height less than the height of the sedimentation tank; One side of the partition plate is a first sedimentation chamber, and the upper end of the first sedimentation chamber is provided with a filter screen, which is elastically lifted along the height direction of the first sedimentation chamber; The other side of the partition plate is a second sedimentation chamber; A water inlet pipe is fixedly arranged on the side surface of the sedimentation tank, the water inlet pipe is in communication with the inside of the first sedimentation chamber, the water inlet pipe is inclined upward to the position communicating with the first sedimentation chamber, the water inlet pipe is connected with a wastewater pump, the wastewater pump pumps wastewater into the water inlet pipe, the wastewater is sprayed upward from the bottom of the filter screen, the large particle impurities are filtered out at the bottom of the filter screen and stored in the first sedimentation chamber by gravity, and the wastewater after filtering out the large particle impurities flows through the filter screen and enters the second sedimentation chamber; The upper end of the partition plate is provided with overflow holes communicating between the first sedimentation chamber and the second sedimentation chamber, the overflow holes are provided in plurality, and the overflow holes are located below the filter screen.

[0006] Preferably, a first elastic expansion mechanism is arranged on the inner wall of the sedimentation tank, the first elastic expansion mechanism comprises a first fixed plate and a first elastic expansion rod, the first fixed plate is fixedly arranged on the inner wall of the sedimentation tank, and the first elastic expansion rod is fixedly connected to the bottom of the first fixed plate; and the bottom of the first elastic expansion rod is fixedly connected with the filter screen.

[0007] Preferably, a one-way valve is arranged in the water inlet pipe, and the water inlet pipe is connected with the sewage pump.

[0008] Preferably, a buried tank is further arranged on the bottom of the sedimentation tank away from the treatment tank, a sewage discharge groove is arranged below the first sedimentation chamber, a bottom plate is arranged in the sewage discharge groove, the edge of the bottom plate and the inner wall of the sewage discharge groove are movably sealed, a second spring expansion mechanism is arranged on the inner wall of the buried tank, the second spring expansion mechanism comprises a second fixed plate and a second spring expansion rod, the second fixed plate is fixedly connected to the inner wall of the buried tank, and the second spring expansion rod is fixedly connected between the upper surface of the second fixed plate and the bottom of the bottom plate.

[0009] Preferably, an electric push rod is fixedly arranged on the inner wall of the sedimentation tank, and a push plate is fixedly arranged on the bottom of the electric push rod; and the push plate corresponds to the upper side of the filter screen.

[0010] Preferably, the treatment tank further comprises: The treatment tank is a trapezoidal tank structure, the height of the treatment tank is lower than that of the sedimentation tank, a communication groove is arranged on the side of the sedimentation tank away from the water inlet pipe, a plurality of treatment grooves are arranged on the treatment tank, the height of the plurality of treatment grooves gradually decreases from the side close to the sedimentation tank to the side away from the sedimentation tank, the communication groove is in communication with the inside of one of the treatment grooves close to the sedimentation tank, and filter cotton plates are arranged in the treatment grooves.

[0011] Preferably, the filter cotton plate comprises a filter cotton layer, a sandwich layer is arranged in the filter cotton layer, a plurality of circular holes are arranged on the surface of the filter cotton layer, and the plurality of circular holes are in communication with the sandwich layer in the filter cotton layer.

[0012] Preferably, a side sealing plate is detachably connected to the side of the treatment tank.

[0013] Preferably, an outlet is further arranged on the side of each treatment tank away from the sedimentation tank, three filter cotton plates are arranged in each treatment tank, the three filter cotton plates are arranged in an up-and-down staggered manner, the top of the two filter cotton plates close to the two sides of the treatment tank is flush with the top of the treatment tank, the height of the middle filter cotton plate is lower than that of the treatment tank and higher than that of the outlet arranged on the side of the treatment tank, and a gap is reserved between the bottom of the two filter cotton plates close to the two sides of the treatment tank and the bottom of the treatment tank.

[0014] The technical effects and advantages of the present application are as follows: 1. The present application can effectively remove large particle impurities in sewage, reduce interference with subsequent treatment links, so that the sewage can be more efficiently purified by the microbial treatment particles in the filter cotton board after entering the treatment tank, thereby improving the treatment efficiency of the whole sewage treatment device, solving the problems of slow recovery and low efficiency of A / O biochemical system. 2. The design of the sedimentation tank makes the sewage undergo preliminary sedimentation and filtration before entering the treatment tank, reducing the impact and influence of particulate matter in the sewage on biological bacteria, and at the same time, the setting of the filter cotton board in the treatment tank provides a good attachment and growth environment for microbial treatment particles, so that they can better adapt to the sewage environment, thereby reducing the risk of large-area death or inactivation of biological bacteria and reducing the need for frequent replenishment of bacterial agents due to bacterial death or inactivation. 3. Since the present application can effectively reduce the mortality and inactivation rate of biological bacteria, the cost of purchasing a large amount of bacterial agents for efficiency enhancement due to insufficient or reduced activity of bacteria is reduced, and at the same time, the structural design of the sedimentation tank and the treatment tank makes the operation of the whole device more stable, reducing the maintenance cost of the equipment, thereby reducing the cost of sewage treatment as a whole, solving the problem of high cost of existing sewage treatment devices. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a perspective structural view of the microbial sewage treatment device with pre-treatment function in embodiment 1 of the present application.

[0016] Figure 2 It is another perspective structural view of the microbial sewage treatment device with pre-treatment function in embodiment 1 of the present application.

[0017] Figure 3 It is a perspective structural view of the microbial sewage treatment device with pre-treatment function in embodiment 1 of the present application.

[0018] Figure 4 It is a perspective structural view of the microbial sewage treatment device with pre-treatment function in embodiment 1 of the present application.

[0019] Figure 5 It is a perspective structural view of the microbial sewage treatment device with pre-treatment function in embodiment 1 of the present application.

[0020] Figure 6 It is a structural view of the microbial sewage treatment device with pre-treatment function in embodiment 2 of the present application.

[0021] Figure 7 It is a structural view of the filter cotton board.

[0022] Figure 8The water flow path structure diagram of the sedimentation tank in the present application.

[0023] Figure 9 The structure diagram of the microbial sewage treatment device with pretreatment function in the embodiment 3 of the present application.

[0024] In the figure: 1, sedimentation tank; 2, treatment tank; 3, communication groove; 4, partition; 5, filter screen; 6, first elastic expansion mechanism; 7, overflow hole; 8, treatment groove; 9, discharge port; 10, filter cotton board; 11, side sealing plate; 12, water inlet pipe; 14, first sedimentation chamber; 15, second sedimentation chamber; 16, buried tank; 17, second spring expansion mechanism; 18, bottom plate; 19, sewage discharge groove; 20, sewage pump; 21, cleaning port; 22, clean water collecting tank; 23, filter cotton layer; 24, round hole; 25, microbial treatment particle; 26, electric push rod; 27, push plate. DETAILED DESCRIPTION

[0025] The present application provides a microbial sewage treatment device with pretreatment function as shown in Figures 1-9 , which can solve the problems of high cost and impact of a large amount of particles in sewage.

[0026] Referring to Figures 1 to 5 , the microbial sewage treatment device with pretreatment function comprises a sedimentation tank 1 and a treatment tank 2, the sedimentation tank 1 and the treatment tank 2 are used in combination, the sedimentation tank 1 is a rectangular tank body structure, the treatment tank 2 is a trapezoidal tank structure, the upper part of the sedimentation tank 1 is open, a partition 4 is fixedly arranged at the middle position inside the sedimentation tank 1, the height of the partition 4 is less than the height of the sedimentation tank 1, the partition 4 divides the inside of the sedimentation tank 1 into a first sedimentation chamber 14 and a second sedimentation chamber 15, a water inlet pipe 12 is fixedly arranged on the side of the sedimentation tank 1, the water inlet pipe 12 is in communication with the inside of the first sedimentation chamber 14, the water inlet pipe 12 is inclined upward to the position communicating with the first sedimentation chamber 14, a filter screen 5 capable of being elastically lifted is arranged at the upper end of the first sedimentation chamber 14, the maximum lifting height of the filter screen 5 does not exceed the top of the partition 4, an overflow hole 7 communicating between the first sedimentation chamber 14 and the second sedimentation chamber 15 is arranged at the upper end of the partition 4, a plurality of overflow holes 7 are arranged, the overflow holes 7 are located below the filter screen 5, the treatment tank 2 is spliced on the side of the sedimentation tank 1 away from the water inlet pipe 12, the height of the treatment tank 2 is lower than the height of the sedimentation tank 1, a communication groove 3 is arranged on the side of the sedimentation tank 1 away from the water inlet pipe 12, a plurality of treatment grooves 8 are arranged on the treatment tank 2, the heights of the plurality of treatment grooves 8 gradually decrease from the end close to the sedimentation tank 1 to the end away from the sedimentation tank 1, the communication groove 3 is in communication with the inside of one treatment groove 8 on the treatment tank 2 close to the sedimentation tank 1, and a filter cotton board 10 is arranged in the treatment groove 8.

[0027] Referring to Figure 6As shown in the figure, when working, the sewage pump 20 is connected to the water inlet pipe 12, and the sewage pump 20 can pump the sewage in the factory into the water inlet pipe 12, and the sewage is sprayed upward from the bottom of the filter screen 5 through the water inlet pipe 12, so that large-particle impurities are filtered out at the bottom of the filter screen 5, and the large-particle impurities are stored in the first sedimentation chamber 14 through gravity, thereby utilizing the principle of gravity and upward spraying of sewage to filter out impurities, reducing the load of the filter screen 5, and significantly reducing manual maintenance and equipment size compared with traditional filter screen filtration.

[0028] When the sewage that is inclined through the filter screen 5 passes over the top of the partition plate 4 into the second sedimentation chamber 15, it enters the treatment tank 2 through the communication groove 3, is filtered through the filter cotton plate 10, and is finally discharged into the clean water collecting tank 22.

[0029] Reference Figure 7 As shown in the figure, the filter cotton plate 10 comprises a filter cotton layer 23, a sandwich layer is arranged in the filter cotton layer 23, and a plurality of circular holes 24 are arranged on the surface of the filter cotton layer 23, the plurality of circular holes 24 are in communication with the sandwich layer inside the filter cotton layer 23, the diameter of the circular hole 24 is small, but the filter cotton layer 23 has good deformation capacity, and when the press-fit mode is used, the microbial treatment particles 25 can be pressed into the sandwich layer through the circular hole 24 and stored, so that the microbial treatment particles 25 are solidified in the filter cotton layer 23, and when the sewage passes through the filter cotton layer 23, the microbial treatment particles 25 inside the filter cotton layer 23 are used to fully contact the sewage, the organic matter in the sewage is decomposed by using the metabolic action of the microbial treatment particles 25, and the organic matter is converted into harmless substances such as carbon dioxide, water and biomass, so that the purpose of purifying the sewage is achieved.

[0030] It should be noted that the filter cotton plate 10 is used to provide a carrier for the growth of the microbial treatment particles 25, and since the diameter of the circular hole 24 is smaller than the diameter of the microbial treatment particles 25, the microbes are not easily taken out by the impact of water, and can continuously multiply in the filter cotton plate 10, thereby continuously acting on the sewage treatment.

[0031] The microbial treatment particles 25 in the application comprise aerobic microbial particles and anaerobic microbial particles.

[0032] The aerobic microbial particles mainly work under aerobic conditions, convert organic matter in the sewage into carbon dioxide and water through oxidation and decomposition, and common aerobic microbial particles include nitrifying bacteria such as Nitrosomonas and Nitrobacter, which are used to convert ammonia nitrogen into nitrate; denitrifying bacteria such as Pseudomonas denitrificans, which are used to reduce nitrate to nitrogen to achieve denitrification; and aerobic heterotrophic bacteria such as Bacillus and Pseudomonas, which are used to decompose organic matter; and in the reaction process: Nitrification reaction: Equation one Equation two The products are carbon dioxide (CO2), water (H2O) and microbial cells.

[0033] In formula one is an ammonium ion, is oxygen, is 2 hydrogen ions, is nitrite, is a nitrate ion.

[0034] The anaerobic microbial granules work under anoxic or anaerobic conditions and convert the organic matter in the wastewater into methane and carbon dioxide through anaerobic decomposition.

[0035] Common microbial granules include: Acid-producing bacteria, such as Clostridium, which is used to decompose complex organic matter into simple organic acids; Methane-producing bacteria, such as methanogens, which are used to convert organic acids and carbon dioxide into methane; Hydrolytic bacteria, such as hydrogen-producing acetogenic bacteria, which are used to hydrolyze organic matter into small-molecule organic matter.

[0036] During the reaction, a hydrolysis reaction occurs: complex organic matter generates simple organic acids.

[0037] In addition, there is also a methane-producing reaction: ; formula three ; formula four The products are methane (CH4), carbon dioxide (CO2) and microbial cells.

[0038] is 2 acetate molecules. Further, the filter cotton plate 10 can be mass-produced and is convenient to store, transport and use. For example, the microbial strains are mixed with a embedding agent such as sodium alginate, and then dropped into a calcium ion solution to form a gel ball with a certain strength, so that the microbial strains are embedded in the interlayer to realize solidification of the strains. During the solidification process, the strains can also be dried to remove excess water and improve the stability and shelf life of the strains.

[0039] Referring to FIG. 1, a side sealing plate 11 is detachably connected to the side of the treatment tank 2. When the side sealing plate 11 is opened, the filter cotton plate 10 can be replaced, which is convenient to use. The side sealing plate 11 needs to be provided with a rubber edge or other sealing mode to maintain the stability of the treatment tank 2.

[0040] Figure 1 Referring to FIG. 1, a side sealing plate 11 is detachably connected to the side of the treatment tank 2. When the side sealing plate 11 is opened, the filter cotton plate 10 can be replaced, which is convenient to use. The side sealing plate 11 needs to be provided with a rubber edge or other sealing mode to maintain the stability of the treatment tank 2. ​​​At the same time, the setting of the partition plate 4 in the sedimentation tank 1 and the stepped setting of the treatment tank 2 can well reduce the impact force of the sewage, so that the sewage flows into the next stage gradually by overflowing the partition plate 4 or the communication groove 3, and the sewage flows slowly, which can not only reduce the impact on the equipment, but also can effectively precipitate and react the particulate matters and other substances to be treated in the sewage.

[0041] Reference Figure 1 And Figure 3 As shown in Figs. 1-3, the treatment tank 2 of each stage is also provided with a discharge port 9 away from the sedimentation tank 1, and the height of the discharge port 9 is lower than the height of the highest group of filter cotton boards 10 in the treatment tank 2 at this position, so as to ensure that the sewage can flow along the stepped state.

[0042] Further, the treatment tank 2 of each stage is provided with three filter cotton boards 10, and the three filter cotton boards 10 are arranged staggeredly, the top of the two filter cotton boards 10 close to the two sides of the treatment tank 2 is flush with the top of the treatment tank 2, the height of the middle filter cotton board 10 is lower than the height of the treatment tank 2 but higher than the height of the discharge port 9 arranged on the side of the treatment tank 2, and the bottom of the two filter cotton boards 10 close to the two sides of the treatment tank 2 is left with a gap from the bottom of the treatment tank 2, so as to staggeredly flow the sewage, prolong the flow path of the sewage, and make the sewage flow through the inside and outside of the filter cotton board 10 along the tortuous channel formed by the plurality of filter cotton boards 10, so as to be fully treated by the microorganisms; the inner wall of the treatment tank 2 is also provided with a clamping groove, and the filter cotton board 10 can be spliced in the treatment tank 2 through the clamping groove, so as to facilitate installation.

[0043] Reference Figure 1 And Figure 3 As shown in Figs. 1-3, the mechanism for providing the filter screen 5 with elastic lifting action is a first elastic extension mechanism 6, the first elastic extension mechanism 6 includes a first fixed plate and a first elastic extension rod, the first fixed plate is fixedly installed on the inner wall of the sedimentation tank 1, the first elastic extension rod is fixedly connected to the bottom of the first fixed plate, and the bottom of the first elastic extension rod is fixedly connected with the filter screen 5, when the bottom of the filter screen 5 is impacted by the sewage, the filter screen 5 moves upward and compresses the first elastic extension mechanism 6, with the change of the impact force of the sewage, the first elastic extension mechanism 6 resets and makes the filter screen 5 descend, so that the filter screen 5 presents a reciprocating lifting phenomenon, filters large particle impurities while reducing the impact of water flow, and can shake off the filtered large particle impurities and precipitate them below the first sedimentation chamber 14 by using the lifting impact force.

[0044] Further, with the accumulation of large-particle impurities and part of the water droplets in the first sedimentation chamber 14, the first sedimentation chamber 14 is mainly divided into two layers, the upper layer is the sewage layer, and the lower layer is the sedimentation layer. Since the sewage discharged into the sedimentation tank 1 by the water inlet pipe 12 directly impacts the bottom of the filter screen 5 and enters the second sedimentation chamber 15 through the partition plate 4, the impact force of the sewage will not affect the sewage layer and the sedimentation layer in the first sedimentation chamber 14. The first sedimentation chamber 14 can maintain static and effectively precipitate. When the sedimentation layer and the sewage layer gradually increase and are higher than the overflow hole 7, the sewage layer enters the second sedimentation chamber 15 for discharge from the overflow hole 7. At this time, the sewage layer does not contain large-particle impurities, which meets the requirement of continuously collecting the sedimentation layer in the first sedimentation chamber 14. However, it should be noted that the height of the overflow hole 7 should be higher than the height of the communication groove 3, and a one-way valve should be provided in the water inlet pipe 12 during use to avoid backflow of the sedimentation layer due to excessive accumulation.

[0045] Embodiment 2 Referring to Figures 6 to 8 As shown in FIG. 2, a buried tank 16 is further provided at the bottom of the sedimentation tank 1 away from the treatment tank 2. A sewage discharge groove 19 is provided below the first sedimentation chamber 14. A bottom plate 18 is provided in the sewage discharge groove 19. The edge of the bottom plate 18 is movably sealed with the inner wall of the sewage discharge groove 19. A second spring telescopic mechanism 17 is installed on the inner wall of the buried tank 16. The second spring telescopic mechanism 17 includes a second fixed plate and a second spring telescopic rod. The second fixed plate is fixedly connected to the inner wall of the buried tank 16. The second spring telescopic rod is fixedly connected between the upper surface of the second fixed plate and the bottom of the bottom plate 18. When the sedimentation layer in the first sedimentation chamber 14 accumulates too much, the second spring telescopic rod is compressed and lowered, causing the bottom plate 18 to lower. Part of the large-particle impurities in the sedimentation layer will enter the buried tank 16 for storage. Then, the bottom plate 18 is reset, allowing the large-particle impurities in the first sedimentation chamber 14 to gradually discharge into the buried tank 16, reducing the maintenance cycle.

[0046] Embodiment 3 Referring to Figure 9 As shown in FIG. 3, an electric push rod 26 can also be fixedly provided on the inner wall of the sedimentation tank 1. A push plate 27 is fixedly provided at the bottom of the electric push rod 26. The push plate 27 corresponds to the upper side of the filter screen 5. When large-particle impurities are blocked in the sedimentation tank 1 and cannot be smoothly discharged into the buried tank 16, the electric push rod 26 can be started. The electric push rod 26 pushes the push plate 27 to contact the filter screen 5, causing the filter screen 5 to lower and compress the sedimentation layer. The large-particle impurities in the sedimentation layer push the bottom plate 18 to open and smoothly enter the buried tank 16, avoiding the blocking condition.

[0047] It should be noted that the surface of the bottom plate 18 can be provided with a pressure sensor or the like to monitor the clogging of the sediment layer. When the clogging is serious, the pressure is too large, at which time the electric push rod 26 needs to be started to dredge. Other ways can also be used, which are not limited here.

Claims

1. A microbial wastewater treatment device with pretreatment function, characterized in that: include: A sedimentation tank (1) is used to remove large particulate impurities from sewage and to allow sewage to settle. The sedimentation tank (1) has an opening at the top and a baffle (4) with a height less than that of the sedimentation tank (1). Among them, one side of the partition (4) is the first sedimentation chamber (14), and a filter screen (5) is provided at the upper end of the first sedimentation chamber (14). The filter screen (5) is elastically raised and lowered along the height direction of the first sedimentation chamber (14). The other side of the partition (4) is the second sedimentation chamber (15); An inlet pipe (12) is fixedly installed on the side of the sedimentation tank (1). The inlet pipe (12) is connected to the inside of the first sedimentation chamber (14). The inlet pipe (12) is inclined upward towards the position connected to the first sedimentation chamber (14). The inlet pipe (12) is connected to the sewage pump (20). The sewage pump (20) pumps sewage into the inlet pipe (12). The sewage is sprayed upward from the bottom of the filter screen (5) through the inlet pipe (12). Large particles of impurities are filtered out at the bottom of the filter screen (5) and fall down to the first sedimentation chamber (14) by gravity for storage. After the large particles of impurities are filtered out, the sewage flows through the filter screen (5) and enters the second sedimentation chamber (5). The upper end of the partition (4) is provided with an overflow hole (7) that connects the first sedimentation chamber (14) and the second sedimentation chamber (15). Multiple overflow holes (7) are provided, and the overflow holes (7) are located below the filter screen (5).

2. The microbial wastewater treatment device with pretreatment function according to claim 1, characterized in that: The sedimentation tank (1) is equipped with a first elastic telescopic mechanism (6). The first elastic telescopic mechanism (6) includes a first fixed plate and a first elastic telescopic rod. The first fixed plate is fixedly installed on the inner wall of the sedimentation tank (1), and the first elastic telescopic rod is fixedly connected to the bottom of the first fixed plate. The bottom of the first elastic telescopic rod is fixedly connected to the filter screen (5).

3. The microbial wastewater treatment device with pretreatment function according to claim 1, characterized in that: A one-way valve is installed in the water inlet pipe (12), and the water inlet pipe (12) is connected to the sewage pump (20).

4. A microbial wastewater treatment device with pretreatment function according to claim 1, characterized in that: The sedimentation tank (1) is located away from the bottom of the treatment tank (2) and a buried tank (16) is provided. A sludge discharge trough (19) is provided below the first sedimentation chamber (14). A bottom plate (18) is provided in the sludge discharge trough (19). The edge of the bottom plate (18) and the inner wall of the sludge discharge trough (19) are kept in a movable seal. A second spring telescopic mechanism (17) is installed on the inner wall of the buried tank (16). The second spring telescopic mechanism (17) includes a second fixed plate and a second spring telescopic rod. The second fixed plate is fixedly connected to the inner wall of the buried tank (16), and the second spring telescopic rod is fixedly connected between the upper surface of the second fixed plate and the bottom of the bottom plate (18).

5. A microbial wastewater treatment device with pretreatment function according to claim 1, characterized in that: An electric push rod (26) is fixedly installed on the inner wall of the sedimentation tank (1), and a push plate (27) is fixedly installed at the bottom of the electric push rod (26), with the push plate (27) corresponding to the top of the filter screen (5).

6. A microbial wastewater treatment device with pretreatment function according to claim 1, characterized in that: Also includes: A treatment tank (2) is attached to the side of the sedimentation tank (1) away from the inlet pipe (12). The treatment tank (2) has a trapezoidal structure and the height of the treatment tank (2) is lower than the height of the sedimentation tank (1). A connecting groove (3) is provided on the side of the sedimentation tank (1) away from the inlet pipe (12). Multiple treatment tanks (8) are provided on the treatment tank (2). The height of the multiple treatment tanks (8) gradually decreases from the end near the sedimentation tank (1) to the end away from the sedimentation tank (1). The connecting groove (3) is connected to the interior of one of the treatment tanks (8) on the treatment tank (2) near the sedimentation tank (1). A filter cotton plate (10) is provided in the treatment tank (8).

7. A microbial wastewater treatment device with pretreatment function according to claim 6, characterized in that: The filter cotton plate (10) includes a filter cotton layer (23), an interlayer is provided in the filter cotton layer (23), and a circular hole (24) is provided on the surface of the filter cotton layer (23). Multiple circular holes (24) are provided, and multiple circular holes (24) are connected to the interlayer inside the filter cotton layer (23).

8. A microbial wastewater treatment device with pretreatment function according to claim 6, characterized in that: The treatment tank (2) is detachably connected to a side sealing plate (11).

9. A microbial wastewater treatment device with pretreatment function according to claim 6, characterized in that: Each treatment tank (2) has an outlet (9) on the side away from the sedimentation tank (1). Each treatment tank (2) has three filter cotton plates (10). The three filter cotton plates (10) are arranged in an alternating manner. The top of the two filter cotton plates (10) near the two sides of the treatment tank (2) is flush with the top of the treatment tank (2). The height of the middle filter cotton plate (10) is lower than the height of the treatment tank (2) and higher than the height of the outlet (9) on the side of the treatment tank (2). There is a gap between the bottom of the two filter cotton plates (10) near the two sides of the treatment tank (2) and the bottom of the treatment tank (2).

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