Sewage pretreatment device for vacuum negative pressure collection system

Abstract

The present invention relates to a sewage pretreatment device of a vacuum negative pressure collection system, which comprises: an air distribution plate, an air lift pipe, a main biological filler area and a pretreatment tank; the air distribution plate is arranged at the bottom of the pretreatment tank, and a plurality of exhaust ports are arranged on its surface; the air inlet end of the air distribution plate is connected to the exhaust port of a vacuum pump of the vacuum negative pressure collection system; the main biological filler area is arranged at the upper part of the pretreatment tank, and an air storage space is reserved between the top surface thereof and the top surface of the pretreatment tank; biological fillers are arranged in the main biological filler area; the bottom end cover of the air lift pipe is arranged above the exhaust port, and the top end passes through the main biological filler area and extends into the air storage space; a vent, a water inlet and a drain are arranged on the pretreatment tank; the water inlet is connected to the air storage space, and is connected to the sewage discharge end of the vacuum negative pressure collection system through a pipeline. After the sewage is pretreated by the device, the load of the back-end treatment facilities can be reduced, the purpose of cost saving can be achieved, and it is conducive to the promotion of the vacuum drainage system in my country.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a sewage pretreatment device of a vacuum negative pressure collection system. Background Art

[0002] Urban sewage treatment generally adopts a gravity system. The gravity system needs to consider the terrain factors. The layout of the sewage pipe needs to be distributed in a stepped manner, resulting in the need to dig trenches of different depths to bury the sewage pipes in many places. However, my country's geology is diverse, which brings great difficulty to the construction. In order to alleviate this problem, the relevant technology uses a vacuum negative pressure collection system to collect and treat sewage. For example, a Chinese patent with publication number CN105507410B discloses a sewage vacuum collection and treatment system, which includes a vacuum collection well, a vacuum transmission pipeline, and a vacuum pump station. The sewage is first collected in a vacuum collection well. When a predetermined amount is collected, the sewage in the vacuum collection well is transported to the vacuum sewage storage tank through a vacuum transmission pipeline under the negative pressure of the vacuum pump. The vacuum negative pressure collection system uses the pressure difference between negative pressure and atmospheric environment to collect sewage, which is less affected by geographical conditions and greatly reduces the difficulty of pipeline layout and construction.

[0003] Whether it is sewage collected by a traditional gravity system or sewage collected by a vacuum negative pressure collection system, it needs to be further treated by aerobic treatment, anaerobic treatment and other purification treatments to meet the discharge standards. Among them, aerobic treatment is achieved by setting up an aeration plate to aerate the sewage for a long time, so it consumes a lot of energy and is the largest energy consumption in sewage purification treatment, and the continuous capital investment is huge. Therefore, how to reduce the energy consumption of sewage treatment and reduce capital investment has attracted more and more attention from technicians in this field. Summary of the invention

[0004] In order to solve or partially solve the problems existing in the related art, the present invention provides a sewage pretreatment device of a vacuum negative pressure collection system.

[0005] The present invention provides a sewage pretreatment device of a vacuum negative pressure collection system, which comprises: an air distribution plate, an air lift pipe, a main biological filler area and a pretreatment tank; wherein:

[0006] The gas distribution plate, gas lift pipe and main biological filler area are all arranged in the pretreatment tank;

[0007] The gas distribution plate is arranged at the bottom of the pretreatment tank, and a plurality of exhaust ports are arranged on its surface; the air inlet end of the gas distribution plate is connected to the exhaust end of the vacuum pump of the vacuum negative pressure collection system;

[0008] The main biological filler area is arranged at the upper part of the pretreatment tank, and an air-containing space is reserved between the top surface of the main biological filler area and the top surface of the pretreatment tank; biological fillers are arranged in the main biological filler area;

[0009] The bottom end of the gas lift pipe is covered above the exhaust port, and the top end thereof passes through the main biological filler area and extends into the gas containing space;

[0010] The pretreatment tank is provided with an air vent, a water inlet and a drain; the water inlet is connected to the air holding space, and is connected to the sewage discharge end of the vacuum negative pressure collection system through a pipeline.

[0011] Furthermore, it also includes a non-powered hood ventilation pipe, the top end of which is connected to the outside atmosphere, and the bottom end of which extends downward into the pretreatment tank and is located below the main biological filler area.

[0012] Furthermore, a vent is provided on the top surface of the pretreatment tank.

[0013] Furthermore, it also includes an anti-overflow baffle, which is arranged in the pretreatment tank and located between the top of the gas lift pipe and the top surface of the pretreatment tank; and a plurality of water leakage holes are evenly arranged on the anti-overflow baffle.

[0014] Furthermore, the water inlet is located between the anti-overflow baffle and the top surface of the pretreatment tank; the anti-overflow baffle is tilted, and its position close to the water inlet is higher than its position far from the water inlet.

[0015] Furthermore, the gas lift pipe comprises, from bottom to top, a large-aperture section, an aperture-reducing section and a small-aperture section.

[0016] Furthermore, the exhaust port of the air distribution plate is a conical exhaust port with an inner diameter gradually decreasing from the bottom to the top.

[0017] Furthermore, the main biological filler area includes: a bottom support plate, a top water distribution plate, and biological fillers located between the bottom support plate and the top water distribution plate; and a plurality of water leakage holes are arranged on the bottom support plate and the top water distribution plate.

[0018] Furthermore, it also includes a secondary biological filler area, which is an annular structure and is arranged on the periphery of the gas distribution plate.

[0019] Further, the drain outlet is arranged near the bottom of the pretreatment tank, and an electromagnetic water valve is installed at the drain outlet; or,

[0020] The drain port is arranged between the bottom of the main biological filler area and a preset sewage liquid level; the preset sewage liquid level is the liquid level of the sewage in the pretreatment tank after the vacuum negative pressure collection system drains water into the pretreatment tank a preset number of times.

[0021] The sewage pretreatment device of the vacuum negative pressure collection system provided by the present invention may have the following beneficial effects:

[0022] 1. The waste gas discharged by the vacuum pump of the vacuum negative pressure collection system and the kinetic energy it carries are reused. The sewage is lifted by using an air distribution plate and an air lift pipe. The sewage increases the contact area with the air during the fall after air lift, increases the dissolved oxygen content in the sewage, and achieves an effect similar to aeration. The sewage flows through the biological filler during the falling process, and the pollutants in the sewage are degraded through the adsorption of macromolecular organic matter by the biological filler and the metabolism of small molecular organic matter by microorganisms. In addition, the gas-liquid contact surface can be increased during the sewage flowing through the biological filler area, so that they are strongly mixed with each other, further increasing the dissolved oxygen content in the sewage and improving the aeration effect; on the other hand, the microorganisms carried down from the biological filler can be fully mixed with the sewage. Therefore, after the sewage is pre-treated by the device, the load of the back-end treatment facilities (such as sewage treatment plants, integrated treatment equipment, etc.) can be reduced, and even the sewage with low pollutant concentration can be directly discharged or used for farmland irrigation through pre-treatment, so as to achieve the purpose of cost saving, which is also conducive to the promotion of vacuum drainage systems in my country.

[0023] 2. The pretreatment device uses less additional energy and has a simple overall device design, which greatly saves energy costs.

[0024] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0026] Figure 1 is a structural schematic diagram of a sewage pretreatment device of a vacuum negative pressure collection system provided in an embodiment of the present invention;

[0027] Figure 2 is a top view of an air distribution plate in a sewage pretreatment device provided in an embodiment of the present invention;

[0028] Figure 3 It is a schematic diagram of the positional relationship between the air distribution plate and the air stripping pipe in the sewage pretreatment device provided by an embodiment of the present invention;

[0029] Figure 4 is a schematic diagram of the positional relationship between the air distribution plate and the air stripping pipe in a sewage pretreatment device provided by another embodiment of the present invention;

[0030] Figure 5 is a schematic front view of a top water distribution tray in a sewage pretreatment device provided by another embodiment of the present invention;

[0031] Figure 6 It is a structural schematic diagram of a sewage pretreatment device of a vacuum negative pressure collection system provided in another embodiment of the present invention.

[0032] Description of Reference Numerals

[0033] 1-Vacuum negative pressure collection system

[0034] 11-Vacuum pump

[0035] 12-Drainage pump

[0036] 2-Air distribution plate

[0037] 21- Exhaust port

[0038] 22-Main plate body

[0039] 23-Connecting pipe

[0040] 3-Gas lift pipe

[0041] 4-Main biological filler area

[0042] 41-Biological filler

[0043] 42-Bottom support plate

[0044] 43-Top water distribution tray

[0045] 5-Pretreatment tank

[0046] 51-Vent

[0047] 52-Water Inlet

[0048] 53-Drainage outlet

[0049] 54-Solenoid water valve

[0050] 6-Unpowered hood ventilation duct

[0051] 7- Anti-overflow baffle

[0052] 8- Secondary biological filler area DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0055] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0056] The vacuum negative pressure collection system relies on a vacuum pump to achieve a pressure difference between the inside and outside of the system. When the vacuum pump is working, it will discharge a large amount of air, which carries kinetic energy. Therefore, the inventor of this application considers using this airflow to pre-treat the collected sewage to achieve a function similar to existing aeration. Based on the above invention concept, the embodiment of this application provides a sewage pre-treatment device for a vacuum negative pressure collection system, please refer to Figure 1 The sewage pretreatment device comprises: an air distribution plate 2, an air stripping pipe 3, a main biological filler area 4 and a pretreatment tank 5; wherein,

[0057] The gas distribution plate 2, the gas stripping pipe 3 and the main biological filler area 4 are all arranged in the pretreatment tank 5;

[0058] The gas distribution plate 2 is arranged at the bottom of the pretreatment tank 5, and a plurality of exhaust ports 21 are arranged on its surface (see Figure 2 ); the air inlet end of the air distribution plate 2 is connected to the exhaust end of the vacuum pump 11 of the vacuum negative pressure collection system 1;

[0059] The main biological filler area 4 is arranged on the upper part of the pretreatment tank 5, and an air space is reserved between the top surface of the main biological filler area 4 and the top surface of the pretreatment tank 5; biological fillers 41 are arranged in the main biological filler area 4;

[0060] The bottom end of the gas lift pipe 3 is covered above the exhaust port 21, and the top end thereof passes through the main biological filler area 4 and extends into the gas containing space;

[0061] The pretreatment tank 5 is provided with an air vent 51, a water inlet 52 and a drain outlet 53; the water inlet 52 is connected to the air storage space, and is connected to the sewage discharge end of the vacuum negative pressure collection system 1 through a pipeline.

[0062] In the sewage pretreatment device provided in this embodiment, the pretreatment tank 5 is used to form a space for pretreatment of sewage, and the water inlet 52 provided therein is used to introduce the sewage pumped out from the vacuum negative pressure collection system 1 into the tank, and is specifically connected to the sewage discharge end of the drainage pump 12 of the vacuum negative pressure collection system 1 through a pipeline; the drainage port 53 provided in the pretreatment tank 5 is used to discharge the pretreated sewage, and the vent 51 provided is used to balance the air pressure inside and outside the tank, so that the sewage can flow in and out smoothly. The interior of the pretreatment tank 5 is provided with an air distribution plate 2, an air lift pipe 3 and a main biological filler area 4. Among them:

[0063] The air distribution plate 2 is used to introduce the airflow discharged from the vacuum pump 11 in the vacuum negative pressure collection system 1 into the pretreatment tank 5. It cooperates with the air lift pipe 3 located above the exhaust port 21 to lift the sewage in the pretreatment tank 5 to the top of the main biological filler area 4. Figure 2 FIG. 2 is a top view of the gas distribution disk 2 in this embodiment. Figure 3 Schematic diagram of the positional relationship between the gas distribution plate 2 and the gas lift pipe 3. In this embodiment, the gas distribution plate 2 includes: a main plate body 22 in an annular shape, and a connecting pipe 23 arranged radially along the main plate body 22, the connecting pipe 23 is connected to the main plate body 22; an exhaust port 21 is provided on the main plate body 22 and the connecting pipe 23; the air inlet end of the main plate body 22 is connected to the exhaust end of the vacuum pump 11 of the vacuum negative pressure collection system 1 through a pipeline. Therefore, the airflow discharged from the vacuum pump 11 enters the main plate body 22 and the connecting pipe 23, and is discharged through the exhaust port 21.

[0064] The airflow discharged from the exhaust port 21 of the air distribution plate 2 will move upward at high speed along the air lift pipe 3 under the guidance of the air lift pipe 3, and a pressure difference will be formed inside and outside the air lift pipe 3, which will absorb the sewage near the bottom of the air lift pipe 3 and move it upward along the gas pipe, and finally splash out from the top of the air lift pipe 3. Those skilled in the art will understand that the number of air lift pipes 3 corresponds to the number of exhaust ports 21 of the air distribution plate 2. In the process of sewage rising in the air lift pipe 3 and splashing out from the top of the air lift pipe 3, the contact area with the air will increase, thereby increasing the dissolved oxygen content in the sewage, achieving an effect similar to aeration. Please refer to Figure 3 The air lift pipe 3 preferably includes, from bottom to top, a large pore section, a pore reduction section, and a small pore section. By providing the pore reduction section, the Venturi effect can be used to further increase the fluid velocity during the sewage adsorption process. Figure 4, the figure shows a schematic diagram of the positional relationship between the gas distribution plate 2 and the gas lift pipe 3 in another embodiment. In this embodiment, the exhaust port 21 of the gas distribution plate 2 is a conical exhaust port with an inner diameter gradually decreasing from the bottom to the top. By designing the conical exhaust port, the flow rate of the airflow discharged from the exhaust port 21 can be increased.

[0065] The main biological filler area 4 is provided with biological filler 41. Anaerobic bacteria are produced inside the biological filler 41 to remove nitrogen by denitrification; aerobic bacteria grow outside to remove organic matter. The sewage splashed from the top of the gas lift pipe 3 flows downward through the main biological filler area 4 under the action of gravity. In the process of sewage flowing through the biological filler 41, the pollutants are degraded by the adsorption of macromolecular organic matter by the biological filler and the metabolism of small molecular organic matter by microorganisms. In addition, the gas-liquid contact surface can be increased in the process of sewage flowing through the main biological filler area 4, so that they are strongly mixed with each other, and the dissolved oxygen content in the sewage is further increased. In addition, the microorganisms carried down from the biological filler can be fully mixed with the sewage.

[0066] The main biological filler area 4 is located at the upper part of the pretreatment tank 5, and an air-containing space is reserved between the main biological filler area 4 and the top surface of the pretreatment tank 5. The air-containing space is used to form a space for the sewage to splash out from the top of the air lift pipe 3 and then fall to fully contact with the air. In addition, the water inlet 52 of the pretreatment tank 5 is also connected to the air-containing space, that is, the water inlet 52 is located above the main biological filler area 4, and the sewage discharged from the sewage discharge end of the vacuum negative pressure collection system 1 will first enter the air-containing space, and then flow through the main biological filler area 4 under the action of gravity and then reach the bottom of the pretreatment tank 5, thereby increasing the number of contacts between the sewage and the biological filler 41, which helps to improve the sewage treatment effect.

[0067] Specifically, the main biological filler area 4 may include: a bottom support plate 42, a top water distribution plate 43, and a biological filler 41 located between the bottom support plate 42 and the top water distribution plate 43; the bottom support plate 42 and the top water distribution plate 43 are both provided with a plurality of water leakage holes. The bottom support plate 42 is used to support the biological filler 41 at a preset height. The top water distribution plate 43 is used to divert the falling water flow so that it passes through the biological filler 41 more evenly. The above-mentioned water leakage holes are preferably evenly arranged on the bottom support plate 42 and the top water distribution plate 43. For further information, please refer to Figure 5 The top surface of the top water distribution tray 43 is an arc surface with an opening downward, that is, a structure with a thick middle and a thin edge is formed by the arc top surface to avoid excessive sewage from being concentrated in the middle of the top water distribution tray 43, so that the sewage is more evenly distributed on the surface of the top water distribution tray 43, thereby making the sewage flow more evenly through the biological filler 41. In addition, the top water distribution tray 43 and / or the bottom support tray 42 are preferably provided with fixing holes for supporting and fixing the air lift pipe 3, thereby more conveniently and stably fixing the position of the air lift pipe 3.

[0068] Regarding the position of the main biological filler area 4 in the pretreatment tank 5, preferably, the bottom end of the main biological filler area 4 is located above the preset sewage liquid level. The preset sewage liquid level is the liquid level of the sewage in the pretreatment tank 5 after the vacuum negative pressure collection system 1 has drained water into the pretreatment tank 5 for a preset number of times. The preset number of times can be one or more, and can be specifically set according to factors such as the single drainage volume of the vacuum negative pressure collection system 1 and the volume of the pretreatment tank 5. In other words, after the drainage pump 12 drains water for a preset number of times, all the sewage enters the pretreatment tank 5 from the water inlet 52 of the pretreatment tank 5, and the liquid level after flowing downward to the bottom of the pretreatment tank 5 is the above-mentioned preset sewage liquid level. For the pretreatment tank 5 with a cylindrical structure, the height of the preset sewage liquid level is approximately equal to the single drainage volume / the inner bottom area of ​​the pretreatment tank×the preset number of drainage times. Accordingly, the height of the bottom end of the main biological filler area 4 from the bottom surface of the pretreatment tank 5 should be greater than the height of the preset sewage liquid level. Since the air pressure of the air discharged from the exhaust port 21 of the air distribution plate 2 is relatively high, the negative pressure caused is relatively high. The biological filler 41 is set above the preset sewage liquid level to prevent the microorganisms in the biological filler 41 from being separated from the surface of the biological filler 41 and washed away by the sewage under the action of strong negative pressure.

[0069] As a preferred solution of this embodiment, see Figure 1 , the above-mentioned sewage pretreatment device also preferably includes an unpowered hood ventilation pipe 6, the top of which is connected to the outside atmosphere, and the bottom of which extends downward into the pretreatment tank 5 and is located below the main biological filler area 4. After the sewage stays in the pretreatment tank 5 for a period of time, the oxygen in the tank is gradually consumed under the action of the anaerobic microorganisms carried in the sewage itself, which has a certain adverse effect on the aerobic microorganisms on the filler in the pretreatment tank. Therefore, by setting a ventilation pipe to improve the air exchange rate inside and outside the pretreatment tank 5, the waste discharge in the pretreatment tank 5 is promoted, and more oxygen-containing air enters the pretreatment tank 5, thereby increasing the oxygen content in the pretreatment tank 5. For the specific selection of the ventilation pipe, the present embodiment adopts an unpowered hood ventilation pipe 6, which utilizes the air thermal convection caused by natural wind and the temperature difference inside and outside the pretreatment tank to drive the turbine to rotate so as to utilize the centrifugal force and the negative pressure effect to discharge the waste gas in the pretreatment tank, so as to improve the ventilation effect in the pretreatment tank 5, and the unpowered hood ventilation pipe 6 does not require additional energy, is noiseless, and can operate for a long time.

[0070] The vent 51 provided on the pretreatment tank 5 is used to balance the internal and external air pressures and also has a certain air exchange function. Figure 1 As shown, the vent 51 of the pretreatment tank 5 is arranged on its top surface, that is, the vent 51 is opened on the top surface of the pretreatment tank 5. Providing the vent 51 on the top surface helps to increase the temperature difference between the inside and outside of the pretreatment tank 5, thereby promoting the work of the unpowered hood ventilation pipe 6.

[0071] For further information, please see Figure 1 The sewage pretreatment device also includes an anti-overflow baffle 7, which is arranged in the pretreatment tank 5 and is located between the top of the gas lift pipe 3 and the top surface of the pretreatment tank 5, that is, arranged in the air-containing space; the anti-overflow baffle 7 is evenly provided with a number of water leakage holes. Although the vent 51 provided on the top surface of the pretreatment tank 5 has the above advantages, it is necessary to reserve a sufficient height between the top of the gas lift pipe 3 to prevent the sewage in the gas lift pipe 3 from overflowing from the vent 51, so the pretreatment tank 5 needs to have a higher height and a larger volume. In this scheme, by adding an anti-overflow baffle 7, resistance is applied to the sewage splashing upward, and the speed of its upward movement is reduced, thereby shortening the design distance from the top of the gas lift pipe 3 to the top surface of the pretreatment tank 5, which helps to reduce the volume of the pretreatment tank 5. In addition, the anti-overflow baffle 7 is evenly provided with a number of water leakage holes, so it also plays a role in uniformly guiding the sewage splashing from the top of the gas lift pipe 3, so that it falls more evenly on the surface of the biological filler 41. More preferably, the water inlet 52 is located between the anti-overflow baffle 7 and the top surface of the pretreatment tank 5; the anti-overflow baffle 7 is tilted, and its position close to the water inlet 52 is higher than its position far from the water inlet 52. Therefore, the anti-overflow baffle 7 can also play a role in evenly distributing the sewage introduced from the water inlet 52, avoiding a large amount of sewage from gathering on the side close to the water inlet 52. By tilting the anti-overflow baffle 7, more sewage can be diverted to the opposite side of the water inlet 52 under the action of gravity, thereby uniformly distributing the sewage flowing through the biological filler 41 during feeding.

[0072] In another preferred embodiment of the present invention, the sewage pretreatment device of the vacuum negative pressure collection system further includes a secondary biological filler area 8, see Figure 6 The secondary biological filler area 8 is an annular structure and is arranged outside the air distribution plate 2. The secondary biological filler area 8 can prolong the contact time between sewage and biological filler, and optimize the pretreatment effect to a certain extent. Furthermore, the auxiliary biological filler preferably adopts hexagonal honeycomb oblique tube filler, and the honeycomb structure is conducive to forming a dead corner of the adsorption area, reducing the probability of microorganisms detaching from the filler surface.

[0073] The drain outlet 53 of the pretreatment tank 5 is used to discharge the pretreated sewage. The specific location of the drain outlet 53 can be as follows:

[0074] like Figure 6 As shown, the drain outlet 53 is arranged near the bottom of the pretreatment tank 5, and an electromagnetic water valve 54 is installed at the drain outlet 53; in this solution, the drainage cycle can be manually controlled by controlling the opening and closing of the electromagnetic valve, which is simple to operate and has strong flexibility.

[0075] or,

[0076] like Figure 1As shown, the drainage port 53 is arranged between the bottom of the main biological filler area 4 and the preset sewage liquid level; the preset sewage liquid level is the liquid level of the sewage in the pretreatment tank 5 after the vacuum negative pressure collection system 1 drains the water into the pretreatment tank 5 for a preset number of times. Therefore, when the sewage in the pretreatment tank 5 reaches the preset sewage liquid level, the sewage entering the pretreatment tank 5 will cause the sewage liquid level to rise further. When it exceeds the drainage port 53, the sewage in the pretreatment tank 5 is automatically discharged through the drainage port 53. The advantage of this method is that no additional energy is required for drainage, which helps to reduce equipment costs and failure rates.

[0077] It can be seen from the above content that the sewage pretreatment device of the vacuum negative pressure collection system provided by the embodiment of the present invention has the following advantages:

[0078] 1. The airflow discharged from the vacuum pump of the vacuum negative pressure collection system and the kinetic energy it carries are reused. The sewage is lifted by using an air distribution plate and an air lift pipe. The sewage increases the contact area with the air during the fall after air lift, increases the dissolved oxygen content in the sewage, and achieves a similar effect to aeration. The sewage flows through the biological filler during the falling process, and the pollutants in the sewage are degraded through the adsorption of macromolecular organic matter by the biological filler and the metabolism of small molecular organic matter by microorganisms. In addition, the gas-liquid contact surface can be increased during the sewage flowing through the biological filler area, so that they are strongly mixed with each other, further increasing the dissolved oxygen content in the sewage and improving the aeration effect; on the other hand, the microorganisms carried down from the biological filler can be fully mixed with the sewage. Therefore, after the sewage is pretreated by the device, the load of the back-end treatment facilities can be reduced, and even the sewage with low pollutant concentration can be directly discharged or used for farmland irrigation through pretreatment, so as to achieve the purpose of cost saving, which is also conducive to the promotion of vacuum drainage system in my country.

[0079] 2. The pretreatment device uses less additional energy and has a simple overall device design, which greatly saves energy costs.

[0080] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A sewage pretreatment device for a vacuum negative pressure collection system, characterized in that: include: Gas distribution tray, gas lift pipe, main biological filler area and pretreatment tank; among them, The gas distribution plate, gas lift pipe and main biological filler area are all arranged in the pretreatment tank; The gas distribution plate is arranged at the bottom of the pretreatment tank, and a plurality of exhaust ports are arranged on its surface; the air inlet end of the gas distribution plate is connected to the exhaust end of the vacuum pump of the vacuum negative pressure collection system; The main biological filler area is arranged at the upper part of the pretreatment tank, and an air-containing space is reserved between the top surface of the main biological filler area and the top surface of the pretreatment tank; biological fillers are arranged in the main biological filler area; The bottom end of the gas lift pipe is covered above the exhaust port, and the top end thereof passes through the main biological filler area and extends into the gas containing space; The pretreatment tank is provided with an air vent, a water inlet and a drain; the water inlet is connected to the air holding space, and is connected to the sewage discharge end of the vacuum negative pressure collection system through a pipeline.

2. The sewage pretreatment device of the vacuum negative pressure collection system according to claim 1 is characterized in that: It also includes a non-powered hood ventilation pipe, the top end of which is connected to the outside atmosphere, and the bottom end of which extends downward into the pretreatment tank and is located below the main biological filler area.

3. The sewage pretreatment device of the vacuum negative pressure collection system according to claim 2 is characterized in that: A vent is provided on the top surface of the pretreatment tank.

4. The sewage pretreatment device of the vacuum negative pressure collection system according to claim 3 is characterized in that: It also includes an anti-overflow baffle, which is arranged in the pretreatment tank and located between the top of the gas lift pipe and the top surface of the pretreatment tank; and a plurality of water leakage holes are evenly arranged on the anti-overflow baffle.

5. The sewage pretreatment device of the vacuum negative pressure collection system according to claim 4 is characterized in that: The water inlet is located between the anti-overflow baffle and the top surface of the pretreatment tank; the anti-overflow baffle is tilted, and its position close to the water inlet is higher than its position far from the water inlet.

6. The sewage pretreatment device of the vacuum negative pressure collection system according to claim 1, characterized in that: The gas lift pipe comprises, from bottom to top, a large-aperture section, an aperture-reducing section and a small-aperture section.

7. The sewage pretreatment device of the vacuum negative pressure collection system according to claim 1, characterized in that: The exhaust port of the air distribution plate is a conical exhaust port with an inner diameter gradually decreasing from the bottom to the top.

8. The sewage pretreatment device of the vacuum negative pressure collection system according to claim 1, characterized in that: The main biological filler area includes: a bottom support plate, a top water distribution plate, and biological fillers located between the bottom support plate and the top water distribution plate; a plurality of water leakage holes are arranged on the bottom support plate and the top water distribution plate.

9. The sewage pretreatment device of the vacuum negative pressure collection system according to claim 1, characterized in that: It also includes a secondary biological filler area, which is an annular structure and is arranged on the periphery of the gas distribution disk.

10. The sewage pretreatment device of the vacuum negative pressure collection system according to claim 1, characterized in that: The drain outlet is arranged near the bottom of the pretreatment tank, and an electromagnetic water valve is installed at the drain outlet; or, The drain port is arranged between the bottom of the main biological filler area and a preset sewage liquid level; the preset sewage liquid level is the liquid level of the sewage in the pretreatment tank after the vacuum negative pressure collection system drains water into the pretreatment tank a preset number of times.

Images