A composite carbon source preparation system for sewage treatment

Abstract

The present invention discloses a composite carbon source preparation system for sewage treatment, which belongs to the technical field of sewage treatment, and solves the problem that in the process of dehydrating the mud cake, the real-time monitoring and control of its water content is the most difficult, and the mud cake is prone to have too low water content, resulting in its brittleness and easy to break. It includes a primary sedimentation tank, an aerobic tank connected to the primary sedimentation tank, an anaerobic tank connected to the aerobic tank, a secondary sedimentation tank connected to the anaerobic tank, a sludge concentration tank connected to the secondary sedimentation tank, a high-pressure diaphragm filter press, and a high-temperature pyrolysis furnace, and the secondary sedimentation tank is used to recycle the sludge and transfer it to the sludge concentration tank. The present invention uses sewage multi-channel treatment to make the sludge in the secondary sedimentation tank clean and used to prepare a composite carbon source. After the sludge is pre-treated in the concentration tank, it is dehydrated by a high-pressure diaphragm filter press, and the air pressure and water pressure are controlled to ensure the appropriate water content of the mud cake, avoid being too tight or too loose, maintain the integrity of the mud cake, and improve the pyrolysis efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a composite carbon source preparation system for sewage treatment. Background Art

[0002] Sludge carbon source preparation is a technology that converts sludge generated during sewage treatment into a usable carbon source. This process is mainly achieved through the hydrolysis and acidification of sludge, which converts the organic matter in the sludge into forms that are easy for microorganisms to use, such as volatile fatty acids (VFA). These converted carbon sources can be used as supplementary carbon sources for biological denitrification and phosphorus removal systems, effectively improving the denitrification efficiency while reducing the addition of external carbon sources and reducing operating costs. The carbon source prepared from sludge not only helps to solve the problem of insufficient carbon sources, but also achieves sludge reduction and resource utilization, which is an environmentally friendly and economical solution. In addition, the use of sludge fermentation liquid as an external carbon source has been proven to significantly improve the removal rate of TN and enable the process effluent to meet more stringent emission standards. Therefore, the sludge carbon source technology has important application value in improving sewage treatment efficiency and promoting sludge resource utilization.

[0003] In the prior art, after the sludge is dehydrated, it is placed in a high-temperature pyrolysis furnace for high-temperature pyrolysis to obtain the required composite carbon source. However, in the actual operation process, the over-dehydrated sludge often maintains two extreme states. The first is that it is pressed into an overly dense mud cake. Although it has good hardness, it is very brittle. During the process of being transported to the high-temperature pyrolysis furnace for pyrolysis, it is easy to break into multiple irregular small mud cakes. The second is to dehydrate the sludge by continuous and uniform heating. At this time, the sludge remains granular, and it is also difficult to pyrolyze it in the high-temperature pyrolysis furnace when it is transported. Therefore, for the preparation of composite carbon source from sludge, the first method is better, but in the process of dehydrating the mud cake, real-time monitoring and control of its water content is the most difficult. It is very easy for the mud cake to have too low water content, resulting in its high brittleness and easy breakage.

[0004] Therefore, a composite carbon source preparation system for sewage treatment is proposed to solve or alleviate the above problems. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a composite carbon source preparation system for sewage treatment.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A composite carbon source preparation system for sewage treatment, comprising a primary sedimentation tank, an aerobic tank connected to the primary sedimentation tank, an anaerobic tank connected to the aerobic tank, a secondary sedimentation tank connected to the anaerobic tank, a sludge concentration tank connected to the secondary sedimentation tank, a high-pressure diaphragm filter press, and a high-temperature pyrolysis furnace, wherein the secondary sedimentation tank is used to recover sludge and transfer it to the sludge concentration tank, the sludge concentration tank is used to concentrate the sludge to reduce the water content to obtain concentrated sludge and transfer it to the high-pressure diaphragm filter press, the high-pressure diaphragm filter press comprises a plurality of compression plates, and a plurality of pressure plates and a plurality of pressure plates disposed adjacent to the compression plates. The filter plates are arranged between the filter plates, and a mud cavity for accommodating concentrated sludge is formed between the filter plates and the pressing plate. The air pressure in the filter plates is adjustable. The mud cavity is connected with a water inlet channel and a water outlet channel provided on the pressing plate. When the high-pressure diaphragm filter press is working, the internal air pressure of several filter plates is increased or decreased in sequence, and after the mud cavities on both sides of the filter plates of the previous sequence cannot pass water, the peak air pressure in the filter plates of the next sequence is controlled to be lower than the peak air pressure in the filter plates of the previous sequence until the mud cavities on both sides of a certain filter plate can pass water, and the air pressure of the remaining filter plates behind the filter plate is adjusted synchronously.

[0008] Preferably, the high-pressure diaphragm filter press also includes an air pressure acquisition module, a water flow acquisition module, a data processing module, and a control module. The air pressure acquisition module is used to collect the air pressure value in each filter plate and feed it back to the data processing module. The water flow acquisition module is used to collect the water flow in the water inlet channel and the water flow in the water outlet channel of the mud cavity on both sides of each filter plate and feed it back to the data processing module. The data processing module determines whether the air pressure value in each filter plate is too high based on the water flow in the water inlet channel and the water flow in the water outlet channel of the mud cavity on both sides of each filter plate and outputs the result to the control module. The control module is used to control the water inlet into the water inlet channel and the air pressure in the filter plate.

[0009] Preferably, the filter plate includes a first frame, a fixing plate fixedly connected in the first frame, and a diaphragm fixedly connected in the first frame and located on both sides of the fixing plate, the first frame is provided with an air hole connected to the diaphragm and the fixing plate, the first frame is fixedly connected with an air pipe connected to the air hole, the air pipe is connected to an air pump, and the air pump is coupled to a control module.

[0010] Preferably, the clamping plate includes a second frame body, and a support plate fixedly connected to the inner circle of the second frame body, the thickness of the support plate is smaller than the thickness of the second frame body, there is a gap between the two sides of the support plate and the two sides of the second frame body, the water inlet channel is opened in the outer circle of the second frame body and passes through the inner circle of the second frame body, the water outlet channel is opened in the inner circle of the second frame body and passes through the outer circle of the second frame body, the water inlet channel is located above the water outlet channel, and a water pipe connected to the water inlet channel is fixedly connected to the second frame body, the water pipe is connected to a water pump, and the water pump is coupled to the control module.

[0011] Preferably, a moving contact arranged away from the fixed plate is fixedly connected to the diaphragm, and the cross-sectional area of ​​the moving contact is gradually reduced from one end toward the diaphragm; a static contact arranged corresponding to the moving contact is fixedly connected to the support plate, and the cross-sectional area of ​​the static contact is gradually reduced from one end toward the support plate; an embedding groove coaxially arranged therewith is provided on the end face of the static contact, and an embedding column coaxially arranged therewith is fixedly connected to the end face of the moving contact, the embedding column and the embedding groove are both conical, and the embedding column can be embedded in the embedding groove.

[0012] Preferably, the air pressure acquisition module includes an air pressure sensor, and the number of the air pressure sensors is several, and the number of the air pressure sensors is the same as the number of filter plates. The air pressure sensor is fixedly connected to the outer ring of the first frame, and the probe of the air pressure sensor passes through the first frame to its inner ring and is located between the fixed plate and the diaphragm. The output end of each of the air pressure sensors is coupled to the input end of the data processing module, and the air pressure sensor collects the air pressure value between the diaphragm and the fixed plate in the corresponding filter plate and feeds it back to the data processing module.

[0013] Preferably, the water flow collection module includes liquid flow sensors, and the number of the liquid flow sensors is several groups. The number of groups of the liquid flow sensors is the same as the number of pressure plates. Each group of the liquid flow sensors includes two liquid flow sensors. The probes of the two liquid flow sensors in the same group are respectively arranged in the water inlet channel and the water outlet channel. The liquid flow sensors are used to collect the water inlet volume in each water inlet channel and the water outlet volume in each water outlet channel and feed back to the data processing module.

[0014] Preferably, the data processing module comprises a processor.

[0015] Preferably, the data processing module determines whether the air pressure value in each filter plate is too high according to the water flow rate of the water inlet channel and the water flow rate of the water outlet channel of the mud cavity on both sides of each filter plate and outputs the result to the control module, including the following steps:

[0016] Receive and mark the peak value of the air pressure in the previous sequence of filter plates fed back by the air pressure acquisition module;

[0017] Receive the water inflow of the water inlet channel and the water outflow of the water outflow channel in the mud chambers on both sides of the filter plate of the previous sequence fed back by the water flow collection module, and compare the water inflow with the water inflow threshold value, and compare the water outflow with the water outflow threshold value;

[0018] If the water inflow is greater than the water inflow threshold and the water outflow is less than the water outflow threshold, the output result is that the peak pressure in the filter plate of the previous sequence is too high, and the peak pressure in the filter plate of the previous sequence is subtracted from the equivalent value and then output to the control module, and the above steps are repeated until the output result is that the peak pressure in the filter plate of the previous sequence is not too high;

[0019] If the water inlet is greater than the water inlet threshold and the water outlet is greater than the water outlet threshold, the output result is that the peak air pressure in the previous sequence filter plate is not too high, and the peak air pressure in the previous sequence filter plate is output to the control module, and the control module controls the peak air pressure in the subsequent sequence filter plate to be the same as the peak air pressure in the filter plate.

[0020] Preferably, the control module comprises a controller.

[0021] The present invention has the following beneficial effects:

[0022] The present invention uses multiple sewage treatment processes to make the sludge precipitated in the secondary sedimentation tank relatively clean and suitable for preparing a composite carbon source;

[0023] The sludge first reduces its moisture content in the sludge thickening tank. When it reaches a certain viscosity, it is easy to introduce into the high-pressure diaphragm filter press for dehydration. The high-pressure diaphragm filter press dehydrates the sludge through the cooperation of the filter plate and the compression plate.

[0024] The control module firstly operates the air pump on the filter plate of the first sequence, sucking air to increase the air pressure, causing the diaphragm to expand and drive the moving contact to move, pressurizing and dehydrating the sludge to form a mud cake with holes;

[0025] If the mud cake is not too tight, the water in the water inlet channel can penetrate the mud cake and leave from the water outlet channel. At this time, the air pressure collection module collects the air pressure peak value, and the control module uses this peak value to dehydrate the subsequent filter plates;

[0026] If the mud cake is too tight and water cannot penetrate, it means that the peak pressure is too high. It is necessary to subtract the equivalent value as the peak pressure of the subsequent filter plate. Repeat this step until the appropriate peak pressure is found to ensure that the mud cake will not be too brittle due to excessive compression, maintain a certain water content, and not easily broken, so that it can remain intact in the high-temperature pyrolysis furnace and improve the pyrolysis efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a structural block diagram of the present invention;

[0029] Figure 2 is a cross-sectional view of the filter plate and the pressing plate in the present invention;

[0030] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0031] Figure 4 It is a structural block diagram of the air pressure acquisition module, water flow acquisition module, data processing module, and control module in the present invention.

[0032] 1. Primary sedimentation tank; 2. Aerobic tank; 3. Anaerobic tank; 4. Secondary sedimentation tank; 5. Sludge thickening tank; 6. High-pressure diaphragm filter press; 7. High-temperature pyrolysis furnace; 8. Compression plate; 9. Fixed contact; 10. Filter plate; 11. Fixed plate; 12. Diaphragm; 13. Moving contact; 14. Embedded groove; 15. Embedded column; 16. Air pressure acquisition module; 17. Water flow acquisition module; 18. Data processing module; 19. Control module. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the invention is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] A composite carbon source preparation system for sewage treatment, such as Figure 1 As shown, it includes a primary sedimentation tank 1, an aerobic tank 2 connected to the primary sedimentation tank 1, an anaerobic tank 3 connected to the aerobic tank 2, a secondary sedimentation tank 4 connected to the anaerobic tank 3, a sludge concentration tank 5 connected to the secondary sedimentation tank 4, a high-pressure membrane filter press 6, and a high-temperature pyrolysis furnace 7. The secondary sedimentation tank 4 is used to recover the sludge and transfer it to the sludge concentration tank 5. The sludge concentration tank 5 is used to concentrate the sludge to reduce the water content to obtain concentrated sludge and transfer it to the high-pressure membrane filter press 6. Figure 2 and Figure 3 As shown, the high-pressure diaphragm filter press 6 includes a plurality of compression plates 8 and filter plates 10 located between adjacent compression plates 8. A mud cavity for accommodating concentrated sludge is formed between the filter plates 10 and the compression plates 8. The air pressure in the filter plates 10 is adjustable. The mud cavity is connected to a water inlet channel and a water outlet channel provided on the compression plates 8. When the high-pressure diaphragm filter press 6 is working, the internal air pressure of the plurality of filter plates 10 is raised and lowered in sequence, and after the mud cavities on both sides of the filter plates 10 of the previous sequence cannot pass water, the peak air pressure in the filter plates 10 of the next sequence is controlled to be lower than the peak air pressure in the filter plates 10 of the previous sequence until the mud cavities on both sides of a certain filter plate 10 can pass water, and then the filter plate 10 is synchronously controlled to adjust the air pressure.

[0040] like Figure 4 As shown, the high-pressure diaphragm filter press 6 also includes an air pressure acquisition module 16, a water flow acquisition module 17, a data processing module 18, and a control module 19. The air pressure acquisition module 16 is used to collect the air pressure value in each filter plate 10 and feed it back to the data processing module 18. The water flow acquisition module 17 is used to collect the water flow rate of the water inlet channel and the water flow rate of the water outlet channel of the mud cavity on both sides of each filter plate 10 and feed it back to the data processing module 18. The data processing module 18 determines whether the air pressure value in each filter plate 10 is too high according to the water flow rate of the water inlet channel and the water flow rate of the water outlet channel of the mud cavity on both sides of each filter plate 10 and outputs the result to the control module 19. The control module 19 is used to control the water inlet of the water inlet channel and the air pressure in the filter plate 10.

[0041] The filter plate 10 includes a first frame, a fixing plate 11 fixedly connected in the first frame, and a diaphragm 12 fixedly connected in the first frame and located on both sides of the fixing plate 11. The first frame is provided with an air hole connected to the diaphragm 12 and the fixing plate 11. The first frame is fixedly connected with an air pipe connected to the air hole. The air pipe is connected to an air pump, and the air pump is coupled to the control module 19.

[0042] The clamping plate 8 includes a second frame body and a support plate fixedly connected to the inner circle of the second frame body. The thickness of the support plate is smaller than the thickness of the second frame body. There is a gap between the two sides of the support plate and the two sides of the second frame body. The water inlet channel is opened in the outer circle of the second frame body and passes through the inner circle of the second frame body. The water outlet channel is opened in the inner circle of the second frame body and passes through the outer circle of the second frame body. The water inlet channel is located above the water outlet channel. A water pipe connected to the water inlet channel is fixedly connected to the second frame body. The water pipe is connected to a water pump. The water pump is coupled to the control module 19.

[0043] like Figure 2 and Figure 3 As shown, a moving contact 13 arranged away from the fixed plate 11 is fixedly connected to the diaphragm 12, and the cross-sectional area of ​​the moving contact 13 is gradually reduced from one end toward the diaphragm 12. A static contact arranged corresponding to the moving contact 13 is fixedly connected to the support plate, and the cross-sectional area of ​​the static contact is gradually reduced from one end toward the support plate. An embedding groove 14 coaxially arranged therewith is provided on the end face of the static contact, and an embedding column 15 coaxially arranged therewith is fixedly connected to the end face of the moving contact 13. The embedding column 15 and the embedding groove 14 are both conical, and the embedding column 15 can be embedded in the embedding groove 14.

[0044] The air pressure acquisition module 16 includes a plurality of air pressure sensors, which are the same as the number of filter plates 10. The air pressure sensors are fixedly connected to the outer ring of the first frame, and the probes of the air pressure sensors penetrate the first frame to its inner ring and are located between the fixed plate 11 and the diaphragm 12. The output end of each air pressure sensor is coupled to the input end of the data processing module 18. The air pressure sensor collects the air pressure value between the diaphragm 12 and the fixed plate 11 in the corresponding filter plate 10 and feeds it back to the data processing module 18.

[0045] The water flow collection module 17 includes liquid flow sensors, and the number of liquid flow sensors is several groups. The number of groups of liquid flow sensors is the same as the number of compression plates 8. Each group of liquid flow sensors includes two liquid flow sensors. The probes of the two liquid flow sensors in the same group are respectively arranged in the water inlet channel and the water outlet channel. The liquid flow sensor is used to collect the water inlet volume in each water inlet channel and the water outlet volume in each water outlet channel and feed back to the data processing module 18.

[0046] The data processing module 18 includes a processor.

[0047] Preferably, the data processing module 18 determines whether the air pressure value in each filter plate 10 is too high according to the water flow rate of the water inlet channel and the water flow rate of the water outlet channel of the mud cavity on both sides of each filter plate 10 and outputs the result to the control module 19, including the following steps:

[0048] Receive and mark the peak value of the air pressure in the filter plate 10 of the previous sequence fed back by the air pressure acquisition module 16;

[0049] Receive the water inflow of the water inlet channel and the water outflow of the water outflow channel in the mud chambers on both sides of the filter plate 10 of the previous sequence fed back by the water flow collection module 17, and compare the water inflow with the water inflow threshold value, and compare the water outflow with the water outflow threshold value;

[0050] If the water inflow is greater than the water inflow threshold and the water outflow is less than the water outflow threshold, the output result is that the peak pressure in the filter plate 10 of the previous sequence is too high, and the peak pressure in the filter plate 10 of the previous sequence is subtracted from the equivalent value and output to the control module 19, and the above steps are repeated until the output result is that the peak pressure in the filter plate 10 of the previous sequence is not too high;

[0051] If the water inlet volume is greater than the water inlet threshold and the water outlet volume is greater than the water outlet threshold, the output result is that the peak air pressure in the previous sequence of filter plates 10 is not too high, and the peak air pressure in the previous sequence of filter plates 10 is output to the control module 19, and the control module 19 controls the peak air pressure in the subsequent sequence of filter plates 10 to be the same as the peak air pressure in the filter plate 10.

[0052] Preferably, the control module 19 includes a controller.

[0053] In the actual application process of the present invention, sewage can be processed in sequence through multiple processes of the primary sedimentation tank 1, the aerobic tank 2, the anaerobic tank 3, and the secondary sedimentation tank 4, so that the sludge precipitated in the secondary sedimentation tank 4 is relatively clean, and the sludge in the secondary sedimentation tank 4 can be used for recycling and preparing the composite carbon source;

[0054] The sludge in the secondary sedimentation tank 4 will first enter the sludge thickening tank 5, and the sludge thickening tank 5 will reduce the water content of the sludge in the secondary sedimentation tank 4 for the first time, so that the sludge can be concentrated in the sludge thickening tank 5, and it is no longer in a thin state, but has a certain viscosity, so that it is convenient to introduce the concentrated sludge into the high-pressure diaphragm filter press 6;

[0055] Since the high-pressure diaphragm filter press 6 realizes the dehydration of sludge by the cooperation of a plurality of filter plates 10 and a pressing plate 8, the plurality of filter plates 10 and the pressing plate 8 are first pressed tightly by the hydraulic cylinder in the high-pressure diaphragm filter press 6. When the pressure gauge on the hydraulic cylinder shows 3000 pounds per square inch, the hydraulic cylinder stops exerting force. At this time, the thick and concentrated sludge can enter between the filter plate 10 and the pressing plate 8, that is, enter the mud cavity on both sides of the filter plate 10. At this time, the sludge completely fills the mud cavity on both sides of the filter plate 10. In this way, the high-pressure diaphragm filter press 6 can start pressurizing to dehydrate the sludge.

[0056] First, the control module 19 controls the air pump on the first sequence of filter plates 10 to start working. The air pump sucks air into between the fixed plate 11 and the diaphragm 12, thereby increasing the air pressure between the two. Since the diaphragm 12 has elastic deformation performance, the diaphragm 12 will drive the moving contact 13 to move, and the diaphragm 12 itself will also expand. The diaphragm 12 and the pressing plate 8 continuously pressurize the sludge in the mud chamber, so that the moisture in the sludge can leave through the water outlet channel. In this process, the embedded column 15 on the moving contact 13 can pierce the sludge / mud cake and then embed into the embedded groove 14, so that the final formed mud cake can have a number of holes.

[0057] After the first sequence of filter plates 10 continuously pressurizes and dehydrates the sludge in the mud chamber, the sludge will form a mud cake in the mud chamber. At this time, the control module 19 controls the water pump to pump water into the water inlet channel. If the mud cake is not pressed too tightly, a small amount of water must be retained in the mud cake. At this time, the water entering the water inlet channel can penetrate the mud cake and leave from the water outlet channel. In this way, the water inlet is greater than the water inlet threshold and the water outlet is also greater than the water outlet threshold. At this time, the air pressure acquisition module 16 can collect the air pressure peak in the filter plate 10 and feed it back to the control module 19, so that the control module 19 pressurizes and dehydrates the filter plates 10 of the subsequent sequence with the same air pressure peak. However, if the mud cake is pressed too tightly at this time, the water content in the mud cake is too low, and the water entering the water inlet channel cannot penetrate the mud cake and leave from the water outlet channel. At this time, it means that the water inlet is greater than the water inlet threshold but the water outlet is less than the water outlet threshold. At this time, it means that the air pressure peak in the first sequence of filter plates 10 If the value is too high, it is necessary to subtract an equivalent value from the peak pressure and then pass it to the control module 19. Then the control module 19 can use the peak pressure after subtracting the equivalent value as the peak pressure in the second sequence filter plate 10, and then repeat the above steps until the water inlet is greater than the water inlet threshold and the water outlet is greater than the water outlet threshold. Then it means that the peak pressure in the sequence filter plate 10 is not too high, and the peak pressure in the sequence filter plate 10 is passed to the control module 19. The control module 19 controls the peak pressure in all subsequent filter plates 10 according to the peak pressure in the sequence filter plate 10, to ensure that the mud cake leaving the high-pressure diaphragm filter press 6 will not be pressed too tightly and cause excessive brittleness, but will have a certain water content and will not be easily broken when demolding, so that the mud cake can maintain its integrity during pyrolysis in the high-temperature pyrolysis furnace 7, and because the mud cake with holes in the embedded column 15 can be more easily heated inside, thereby improving its pyrolysis efficiency.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A composite carbon source preparation system for sewage treatment, characterized in that: The invention comprises a primary sedimentation tank (1), an aerobic tank (2) connected to the primary sedimentation tank (1), an anaerobic tank (3) connected to the aerobic tank (2), a secondary sedimentation tank (4) connected to the anaerobic tank (3), a sludge concentration tank (5) connected to the secondary sedimentation tank (4), a high-pressure membrane filter press (6), and a high-temperature pyrolysis furnace (7). The secondary sedimentation tank (4) is used to recover sludge and transfer it to the sludge concentration tank (5). The sludge concentration tank (5) is used to concentrate the sludge to reduce the water content to obtain concentrated sludge and transfer it to the high-pressure membrane filter press (6). The high-pressure membrane filter press (6) comprises a plurality of compression plates (8) and a filter plate (10) located between adjacent compression plates (8). The filter plate (10) and the compression plate (8) form a A mud chamber for accommodating concentrated sludge, wherein the air pressure in the filter plate (10) is adjustable, and the mud chamber is connected to an inlet channel and an outlet channel provided on a compression plate (8). When the high-pressure membrane filter press (6) is working, a plurality of filter plates (10) raise and lower the internal air pressure in sequence, and after the water inflow of the inlet channels of the mud chambers on both sides of the previous sequence of filter plates (10) is greater than the inlet threshold and the water outflow of the outlet channels is less than the outlet threshold, the air pressure peak value in the next sequence of filter plates (10) is controlled to be lower than the air pressure peak value in the previous sequence of filter plates (10) until the water inflow of the inlet channels of the mud chambers on both sides of a certain filter plate (10) is greater than the inlet threshold and the water outflow of the outlet channels is greater than the outlet threshold, and then the air pressure of the remaining filter plates (10) behind the filter plate (10) is adjusted simultaneously.

2. A composite carbon source preparation system for sewage treatment according to claim 1, characterized in that: The high-pressure diaphragm filter press (6) further comprises an air pressure acquisition module (16), a water flow acquisition module (17), a data processing module (18), and a control module (19); the air pressure acquisition module (16) is used to acquire the air pressure value in each filter plate (10) and feed it back to the data processing module (18); the water flow acquisition module (17) is used to acquire the water flow in the water inlet channel and the water flow in the water outlet channel of the mud cavity on both sides of each filter plate (10) and feed it back to the data processing module (18); the data processing module (18) determines whether the air pressure value in each filter plate (10) is too high based on the water flow in the water inlet channel and the water flow in the water outlet channel of the mud cavity on both sides of each filter plate (10) and outputs the result to the control module (19); the control module (19) is used to control the water inlet into the water inlet channel and the air pressure in the filter plate (10).

3. A composite carbon source preparation system for sewage treatment according to claim 2, characterized in that: The filter plate (10) comprises a first frame, a fixing plate (11) fixedly connected to the first frame, and a diaphragm (12) fixedly connected to the first frame and located on both sides of the fixing plate (11); the first frame is provided with an air hole connected to the diaphragm (12) and the fixing plate (11); the first frame is fixedly connected with an air pipe connected to the air hole; the air pipe is connected to an air pump; and the air pump is coupled to a control module (19).

4. A composite carbon source preparation system for sewage treatment according to claim 3, characterized in that: The clamping plate (8) includes a second frame body and a support plate fixedly connected to the inner circle of the second frame body, the thickness of the support plate is less than the thickness of the second frame body, and there is a gap between the two sides of the support plate and the two sides of the second frame body, the water inlet channel is opened in the outer circle of the second frame body and penetrates to the inner circle of the second frame body, the water outlet channel is opened in the inner circle of the second frame body and penetrates to the outer circle of the second frame body, the water inlet channel is located above the water outlet channel, and a water pipe connected to the water inlet channel is fixedly connected to the second frame body, and the water pipe is connected to a water pump, and the water pump is coupled to the control module (19).

5. A composite carbon source preparation system for sewage treatment according to claim 4, characterized in that: A moving contact (13) arranged away from the fixed plate (11) is fixedly connected to the diaphragm (12), and the cross-sectional area of ​​the moving contact (13) is gradually reduced from one end facing the diaphragm (12). A stationary contact arranged corresponding to the moving contact (13) is fixedly connected to the support plate, and the cross-sectional area of ​​the stationary contact is gradually reduced from one end facing the support plate. An embedding groove (14) arranged coaxially with the stationary contact is provided on the end surface of the stationary contact. An embedding column (15) arranged coaxially with the moving contact (13) is fixedly connected to the end surface of the moving contact (13), and the embedding column (15) and the embedding groove (14) are both conical, and the embedding column (15) can be embedded in the embedding groove (14).

6. A composite carbon source preparation system for sewage treatment according to claim 5, characterized in that: The air pressure acquisition module (16) comprises an air pressure sensor, the number of which is plural and the number of which is the same as the number of the filter plates (10), the air pressure sensor being fixedly connected to the outer ring of the first frame, the probe of the air pressure sensor penetrating the first frame to its inner ring and being located between the fixed plate (11) and the diaphragm (12), the output end of each of the air pressure sensors being coupled to the input end of the data processing module (18), the air pressure sensor collecting the air pressure value between the diaphragm (12) and the fixed plate (11) in the corresponding filter plate (10) and feeding it back to the data processing module (18).

7. A composite carbon source preparation system for sewage treatment according to claim 6, characterized in that: The water flow acquisition module (17) comprises a liquid flow sensor, the number of which is a plurality of groups. The number of groups of the liquid flow sensors is the same as the number of the pressing plates (8). Each group of the liquid flow sensors comprises two liquid flow sensors. The probes of the two liquid flow sensors in the same group are respectively arranged in the water inlet channel and the water outlet channel. The liquid flow sensors are used to collect the water inflow in each water inlet channel and the water outflow in each water outlet channel and feed back to the data processing module (18).

8. A composite carbon source preparation system for sewage treatment according to claim 2, characterized in that: The data processing module (18) comprises a processor.

9. A composite carbon source preparation system for sewage treatment according to claim 7, characterized in that: The data processing module (18) determines whether the air pressure value in each filter plate (10) is too high according to the water flow rate of the water inlet channel and the water flow rate of the water outlet channel of the mud cavity on both sides of each filter plate (10) and outputs the result to the control module (19), comprising the following steps: receiving and marking the peak value of the air pressure in the filter plate (10) of the previous sequence fed back by the air pressure acquisition module (16); receiving the water inflow of the water inlet channel and the water outflow of the water outflow channel in the mud chambers on both sides of the filter plate (10) of the previous sequence fed back by the water flow collection module (17), and comparing the water inflow with the water inflow threshold value, and comparing the water outflow with the water outflow threshold value; If the water inflow is greater than the water inflow threshold and the water outflow is greater than the water outflow threshold, the output result is that the peak value of the air pressure in the filter plate (10) of the previous sequence is not too high, and the peak value of the air pressure in the filter plate (10) of the previous sequence is output to the control module (19), and the control module (19) controls the peak value of the air pressure in the filter plate (10) of the subsequent sequence to be the same as the peak value of the air pressure in the filter plate (10); If the water inflow is greater than the water inflow threshold and the water outflow is less than the water outflow threshold, the output result is that the peak air pressure in the previous sequence of filter plates (10) is too high, and the peak air pressure in the previous sequence of filter plates (10) is subtracted from the equivalent value and output to the control module (19). The control module (19) uses the peak air pressure after subtracting the equivalent value as the peak air pressure in the next sequence of filter plates (10), and repeats the above steps until the output result is that the peak air pressure in the previous sequence of filter plates (10) is not too high.

10. A composite carbon source preparation system for sewage treatment according to claim 2, characterized in that: The control module (19) comprises a controller.

Images