Backflow fermentation horizontal-flow type primary sedimentation tank

Abstract

The utility model relates to a reflux fermentation horizontal-flow type primary sedimentation tank which comprises a water inlet tank, a mixing buffer tank, a rectifying part, a sludge hopper, a fermentation tank, a reflux pump assembly, a sludge scraping assembly, a stirring assembly and a sludge discharging assembly, wherein the sludge hopper is arranged on the other side of the mixing buffer pool relative to the water inlet tank, the upper part of the sludge hopper is communicated with the mixing buffer pool, a stirring assembly is arranged in the sludge hopper, and a sludge discharging assembly for discharging sludge is further arranged at the bottom of the sludge hopper; the reflux pump assembly is arranged at the bottom of the sludge hopper, so that the bottom of the sludge hopper is communicated with the mixing buffer pool; the reflux pump assembly is used for monitoring the concentration of suspended matters of muddy water refluxed from the sludge hopper to the mixing buffer pool; according to the application, the concentration of suspended matters of muddy water flowing back to the mixing buffer pool by the sludge hopper is monitored through the reflux pump assembly, so that the concentration of the suspended matters of the muddy water flowing back to the mixing buffer pool is stable, the concentration of the suspended matters in the mixing buffer pool is accurately regulated and controlled, the reflux pump does not need to extract sludge with overhigh concentration for a long time, and the sewage treatment cost is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of sewage treatment, and in particular relates to a reflux fermentation horizontal flow primary sedimentation tank. Background Art

[0002] Since the 1990s, sewage treatment plants have installed primary sedimentation tank units at the front end of the sewage treatment process. The main purpose is to use the natural sedimentation of particulate pollutants to remove some difficult-to-degrade particulate pollutants in the influent, so as to reduce the load of subsequent biological treatment units. However, as the particulate matter settles, a large amount of carbon source in the sewage is also removed, which increases the difficulty of subsequent biological nitrogen and phosphorus removal.

[0003] Chinese patent CN102923852A discloses an activated primary sedimentation tank for reducing the loss of organic matter in sewage. A sludge hopper is arranged at the front end of the sedimentation zone, and a mechanical mixing tank connected to a water channel is arranged at the front end of the sludge hopper. The mechanical mixing tank and the sludge hopper are separated by a water distribution wall. A stirring device is arranged in the mechanical mixing tank. The lower part of the mechanical mixing tank is connected to the bottom of the sludge hopper through a sludge return pipe to form a sludge return system; the primary sludge is fully mixed with the original sewage through the mechanical mixing tank to realize the in-situ release of the inherent carbon source in the primary sludge.

[0004] However, the above patent pumps the sludge in the sludge hopper back into the mechanical mixing tank for crushing and mixing, but cannot accurately control the suspended matter concentration of the mud water in the mechanical mixing tank. Long-term extraction of sludge with excessive concentration will reduce the service life of the reflux pump and increase the cost of sewage treatment. Utility Model Content

[0005] In response to the shortcomings in the relevant technology, the present application provides a reflow fermentation horizontal flow primary sedimentation tank, which monitors the suspended matter concentration of the mud water returning from the sludge hopper to the mixing buffer tank through a reflow pump assembly, thereby stabilizing the suspended matter concentration of the mud water returning to the mixing buffer tank, and then accurately controlling the suspended matter concentration in the mixing buffer tank. The reflow pump does not need to extract sludge with excessively high concentration for a long time, thereby reducing the cost of sewage treatment.

[0006] The present application provides a reflux fermentation advection type primary sedimentation tank, comprising:

[0007] A water inlet tank, the water inlet tank is used to introduce raw sewage;

[0008] A mixing buffer tank, disposed at one side of the water inlet tank and connected thereto;

[0009] A rectifying member, disposed between the water inlet trough and the mixing buffer tank;

[0010] A sludge hopper is arranged on the other side of the mixing buffer tank relative to the water inlet tank, the upper part of the sludge hopper is connected to the mixing buffer tank, a stirring component is arranged in the sludge hopper, and a sludge discharge component is also arranged at the bottom of the sludge hopper for sludge discharge;

[0011] A fermentation tank is arranged on a side of the sludge hopper relatively far from the mixing buffer tank, the fermentation tank is connected to the sludge hopper, and a water outlet is arranged at one end of the fermentation tank far from the sludge hopper;

[0012] A reflux pump assembly is disposed at the bottom of the sludge hopper so that the bottom of the sludge hopper is connected to the mixing buffer tank, and the reflux pump assembly is used to monitor the concentration of suspended matter in the sludge water returned from the sludge hopper to the mixing buffer tank;

[0013] The sludge scraping assembly is arranged in the fermentation tank, and is used to control the flow state of water flow and return the settled sludge in the fermentation tank to the sludge hopper.

[0014] In some embodiments, the reflux pump assembly comprises:

[0015] A reflux pipe, one end of which is connected to the bottom of the sludge hopper and the other end of which is connected to the bottom of the mixing buffer tank;

[0016] A reflux pump, arranged on the reflux pipe, and used for pumping muddy water in the sludge hopper to the mixing buffer tank;

[0017] A reflux flow meter, arranged on the reflux pipe and located on one side of the reflux pump, the reflux flow meter is used to count the amount of muddy water pumped by the reflux pump;

[0018] The suspended matter concentration detector is arranged on the return pipe and located on one side of the return pump. The suspended matter concentration detector is used to monitor the suspended matter concentration in the muddy water extracted by the return pump.

[0019] In some embodiments, the mud discharge assembly includes:

[0020] A sludge discharge pipe, one end of which is connected to the bottom of the sludge hopper and the other end of which is connected to a sludge pool;

[0021] A sludge pump is provided on the sludge discharge pipe, and is used to pump the sludge water in the sludge hopper to the sludge discharge pool;

[0022] The mud discharge flow meter is arranged on the mud discharge pipe and located on one side of the mud discharge pump. The mud discharge flow meter is used to count the amount of mud and water pumped by the mud discharge pump.

[0023] In some embodiments, the reflux fermentation advection type primary sedimentation tank further comprises:

[0024] A main control board, the main control board is electrically connected to the reflux pump assembly, the mud discharge assembly and the stirring assembly, the main control board is used to monitor the concentration of suspended matter in the mud water extracted by the reflux pump through the reflux pump assembly, and then increase the concentration of suspended matter in the mud water by controlling the stirring assembly; or, the main control board reduces the concentration of suspended matter in the mud water by controlling the mud discharge assembly.

[0025] In some embodiments, the scraper assembly comprises:

[0026] A mud scraper, arranged in the fermentation tank;

[0027] A mud scraping motor is connected to the mud scraping member, and is used to drive the mud scraping member to move from the mixing buffer tank toward the water outlet.

[0028] In some embodiments, the scraper assembly further includes a support member, at least two of which are fixed in the fermentation tank, and the two support members are respectively located on a side of the scraper member close to the water surface and a side of the scraper member away from the water surface.

[0029] In some embodiments, the reflux fermentation advection type primary sedimentation tank further comprises:

[0030] The slag skimming assembly is arranged at one end of the scraping assembly close to the water outlet.

[0031] In some embodiments, the reflux fermentation advection type primary sedimentation tank further comprises:

[0032] The water outlet weir plate is arranged on one side of the mud scraper assembly close to the water outlet.

[0033] In some embodiments, the reflux fermentation advection type primary sedimentation tank further comprises:

[0034] The water collecting tank is arranged on a side of the water outlet away from the fermentation tank.

[0035] In some embodiments, the stirring assembly comprises:

[0036] A stirring member, arranged in the sludge hopper;

[0037] A stirring motor, the stirring motor is connected to the stirring member, and the stirring motor is used to drive the stirring member to control the concentration of suspended matter in the mud water in the sludge hopper;

[0038] The speed regulating member is arranged between the stirring member and the stirring motor and is respectively connected to both of them. The speed regulating member is used to control the rotation speed of the stirring member.

[0039] In summary, the present application provides a reflow fermentation horizontal flow primary sedimentation tank, which monitors the suspended matter concentration of the mud water returned from the sludge hopper to the mixing buffer tank through a reflow pump component. When the suspended matter concentration is too low, the stirring component is controlled to increase the suspended matter concentration in the sludge hopper. When the suspended matter concentration is too high, the sludge discharge component is controlled to reduce the suspended matter concentration in the sludge hopper, thereby stabilizing the suspended matter concentration of the mud water returned to the mixing buffer tank, and then accurately controlling the suspended matter concentration in the mixing buffer tank. The reflow pump does not need to extract sludge with excessively high concentration for a long time, thereby reducing the cost of sewage treatment.

[0040] Other features and advantages of the present invention will be described in the following description, and part of them will become obvious from the description in the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0042] Figure 1 This is the main view of the reflux fermentation advection type primary sedimentation tank of this application;

[0043] Figure 2 This is a top view of the reflow fermentation advection type primary sedimentation tank of this application.

[0044] In the figure:

[0045] 1. Water inlet tank; 2. Mixing buffer tank; 3. Rectifier; 4. Sludge hopper; 5. Fermentation tank; 6. Reflux pump assembly; 7. Sludge scraper assembly; 8. Stirring assembly; 9. Sludge discharge assembly; 10. Slag skimmer assembly; 11. Water outlet weir plate; 12. Water collecting tank. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0047] In the description of the present application, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 application.

[0048] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. Specific embodiments

[0051] The present application provides a reflux fermentation horizontal flow primary sedimentation tank, comprising an inlet tank 1, a mixing buffer tank 2, a rectifying component 3, a sludge hopper 4, a fermentation tank 5, a reflux pump assembly 6, a sludge scraping assembly 7, a stirring assembly 8 and a sludge discharge assembly 9; wherein the inlet tank 1 is used to introduce raw sewage; the mixing buffer tank 2 is arranged on one side of the inlet tank 1 and is connected thereto; the rectifying component 3 is arranged between the inlet tank 1 and the mixing buffer tank 2; the sludge hopper 4 is arranged on the other side of the mixing buffer tank 2 relative to the inlet tank 1, the upper part of the sludge hopper 4 is connected to the mixing buffer tank 2, a stirring assembly 8 is arranged in the sludge hopper 4, and the sludge A sludge discharge assembly 9 is also provided at the bottom of the sludge hopper 4 for discharging sludge; the fermentation tank 5 is arranged on a side of the sludge hopper 4 relatively far away from the mixing buffer tank 2, the fermentation tank 5 is connected to the sludge hopper 4, and a water outlet is provided at one end of the fermentation tank 5 far away from the sludge hopper 4; a reflux pump assembly 6 is arranged at the bottom of the sludge hopper 4 to connect the bottom of the sludge hopper 4 with the mixing buffer tank 2, and the reflux pump assembly 6 is also used to monitor the suspended matter concentration of the sludge water refluxed from the sludge hopper 4 to the mixing buffer tank 2; a sludge scraping assembly 7 is arranged in the fermentation tank 5, and the sludge scraping assembly 7 is used to control the water flow state and send the settled sludge in the fermentation tank 5 back to the sludge hopper 4.

[0052] Reference Figure 1In some embodiments, the water inlet tank 1 is connected to the water inlet pipe, and the water inlet pipe and the water inlet tank 1 cooperate to introduce raw sewage. Since it is necessary to regulate the suspended solids concentration of the muddy water in the mixing buffer tank 2, the water inlet tank 1 is also used to store excess raw sewage to regulate the amount of raw sewage introduced, so as to avoid the raw sewage directly entering the mixing buffer tank 2 through the water inlet pipe, resulting in the suspended solids concentration of the muddy water in the mixing buffer tank 2 being not accurate enough.

[0053] Reference Figure 1 and Figure 2 In some embodiments, the mixing buffer tank 2 is disposed at one side of the water inlet tank 1 and is connected thereto. The mixing buffer tank 2 is used to mix the raw sewage and the pumped back muddy water to adjust the suspended matter concentration in the muddy water to meet the requirements of different suspended matter concentrations.

[0054] Reference Figure 1 and Figure 2 In some embodiments, the sludge hopper 4 is arranged on the other side of the mixing buffer tank 2 relative to the water inlet tank 1, the upper part of the sludge hopper 4 is connected to the mixing buffer tank 2, a rectifying part 3 is arranged between the water inlet tank 1 and the mixing buffer tank 2, a stirring assembly 8 is arranged in the sludge hopper 4, and a sludge discharge assembly 9 is also arranged at the bottom of the sludge hopper 4 for sludge discharge.

[0055] The sludge in the sludge hopper 4 comes from sedimentation, most of which is large-particle sludge, which is difficult to mix with sewage. The large-particle sludge is broken up by the stirring component 8 and mixed with sewage to form muddy water. The concentration of suspended matter in the muddy water is increased by mixing with the stirring component 8. However, based on different scenarios in actual applications, there are different requirements for the concentration of suspended matter in the muddy water. Therefore, the muddy water in the sludge hopper 4 needs to be pumped back to the mixing buffer tank 2 to readjust the suspended matter concentration.

[0056] Reference Figure 1 and Figure 2 The rectifying component 3 includes but is not limited to a vertical rectifying wall and a water distribution splash wall, which is arranged between the water inlet trough 1 and the mixing buffer tank 2, and is mainly used to separate the water flow state of the mixing buffer tank 2 and the sludge hopper 4 to prevent the flow states in the two areas from interfering with each other. The rectifying component 3 allows water to pass through, and the muddy water in the mixing buffer tank 2 flows to the fermentation tank 5 after passing through the rectifying component 3.

[0057] Reference Figure 1 and Figure 2In some embodiments, the fermentation tank 5 is arranged on a side of the sludge hopper 4 relatively far away from the mixing buffer tank 2. The fermentation tank 5 is connected to the sludge hopper 4, and the upper part of the sludge hopper 4 is connected to the mixing buffer tank 2. An outlet is provided at one end of the fermentation tank 5 away from the sludge hopper 4. The fermentation tank 5 is used to receive the muddy water sent out from the mixing buffer tank 2. The muddy water sent out from the mixing buffer tank 2 is further settled and fermented in the fermentation tank 5, so that the SCOD (soluble organic matter) concentration of the muddy water output at the outlet of the fermentation tank 5 is increased, and the COD (chemical oxygen demand) concentration of the effluent of the reflux fermentation horizontal flow primary sedimentation tank is increased while improving the carbon source structure of the effluent of the reflux fermentation horizontal flow primary sedimentation tank, so as to provide more and better carbon sources for subsequent biological treatment of nitrogen removal and phosphorus removal.

[0058] Reference Figure 1 In some embodiments, the reflux pump assembly 6 is arranged at the bottom of the sludge hopper 4 to connect the bottom of the sludge hopper 4 with the mixing buffer tank 2. The reflux pump assembly 6 includes a reflux pipe, a reflux pump, a reflux flowmeter and a suspended matter concentration detector; wherein one end of the reflux pipe is connected to the bottom of the sludge hopper 4, and the other end of the reflux pipe is connected to the bottom of the mixing buffer tank 2.

[0059] The reflux pump is arranged on the reflux pipe, and is used to pump the muddy water in the sludge hopper 4 to the mixing buffer tank 2 through the reflux pipe. The reflux flowmeter is arranged on the reflux pipe and is located on one side of the reflux pump. The reflux flowmeter is used to count the amount of muddy water pumped by the reflux pump.

[0060] The suspended matter concentration detector is installed on the return pipe and located on one side of the return pump. The suspended matter concentration detector is a SS detector, and its types include but are not limited to optical SS detectors, weight SS detectors and resistivity SS detectors. The suspended matter concentration detector is used to monitor the suspended matter concentration in the muddy water extracted by the return pump.

[0061] Reference Figure 1 and Figure 2 In some embodiments, a scraper assembly 7 is disposed in the fermentation tank 5, and the scraper assembly 7 is used to control the flow state of water and return the settled sludge in the fermentation tank 5 to the sludge hopper 4. The scraper assembly 7 includes a scraper member, a scraper motor and a support member; wherein the scraper member is disposed in the fermentation tank 5, and the scraper member is a chain scraper, and the scraper motor is connected to the scraper member, and the scraper motor is used to drive the chain of the scraper member to move from the mixing buffer tank 2 to the water outlet, thereby driving the water flow state in the fermentation tank 5 to move from the mixing buffer tank 2 to the water outlet, and the chain of the scraper member pushes the sludge settled at the bottom of the fermentation tank 5 into the sludge hopper 4.

[0062] Reference Figure 1 and Figure 2In some embodiments, at least two supports are fixed in the fermentation tank 5, and the two supports are respectively located on the side of the scraper close to the water surface and the side of the scraper away from the water surface. The supports are used to support the scraper so that the chain of the scraper is at a standard height and is not too far or too close to the water surface; in some embodiments, four supports are fixed in the fermentation tank 5, and the four supports are cross-arranged on the side of the scraper close to the water surface and the side of the scraper away from the water surface to ensure the stable operation of the scraper.

[0063] Reference Figure 1 and Figure 2 In some embodiments, the reflux fermentation horizontal flow primary sedimentation tank also includes a skimming assembly 10, which is arranged at one end of the scraper assembly 7 close to the water outlet. The skimming assembly 10 includes but is not limited to a skimming float. The skimming assembly 10 is used to collect solid impurities floating in the upper sewage pushed by the scraper for centralized transportation and removal.

[0064] Reference Figure 1 and Figure 2 In some embodiments, the reflux fermentation horizontal flow primary sedimentation tank also includes an outlet weir plate 11, which is arranged on the side of the scraper assembly 7 close to the outlet. The outlet weir plate 11 is used to control the outlet flow rate and water level to ensure that the carbon-containing water in the fermentation tank 5 flows out of the outlet evenly; in some embodiments, the outlet weir plate 11 is 120 mm higher than the design water level.

[0065] Reference Figure 1 and Figure 2 In some embodiments, the reflux fermentation horizontal flow primary sedimentation tank further includes a water collection tank 12, which is disposed on a side of the water outlet away from the fermentation tank 5, and the water collection tank 12 is used to centrally store the carbon-containing water flowing out of the water outlet for subsequent use.

[0066] Reference Figure 1 and Figure 2 In some embodiments, the stirring assembly 8 includes a stirring member, a stirring motor and a speed regulating member. The stirring member includes but is not limited to a stirring rod, a stirring paddle and a spiral blade. The stirring member is arranged in the lower half of the sludge hopper 4; the stirring motor is connected to the stirring member, and the stirring motor is used to drive the stirring member to rotate, break up the large particles of sludge in the sludge hopper 4 and mix it with sewage to control the suspended matter concentration of the mud water in the sludge hopper 4; the speed regulating member is arranged between the stirring member and the stirring motor and is respectively connected to the two. The speed regulating member includes but is not limited to a reducer. The speed regulating member controls the rotation speed of the stirring member based on the concentration of influent particles and organic matter.

[0067] Reference Figure 1In some embodiments, the mud discharge assembly 9 includes a mud discharge pipe, a mud discharge pump and a mud discharge flow meter. One end of the mud discharge pipe is connected to the bottom of the sludge hopper 4, and the other end is connected to a mud discharge pool. The mud discharge pump is arranged on the mud discharge pipe, and the mud discharge pump is used to pump the mud and water in the sludge hopper 4 to the mud discharge pool to reduce the amount of sludge in the sludge hopper 4, thereby reducing the concentration of suspended matter in the sludge hopper 4; the mud discharge flow meter is arranged on the mud discharge pipe and is located on one side of the mud discharge pump. The mud discharge flow meter is used to count the amount of mud and water extracted by the mud discharge pump.

[0068] In some embodiments, the reflux fermentation horizontal flow primary sedimentation tank also includes a main control board, which is electrically connected to the reflux pump assembly 6, the mud discharge assembly 9 and the stirring assembly 8. The main control board is used to monitor the concentration of suspended matter in the mud water extracted by the reflux pump through the reflux pump assembly 6, and then increase the concentration of suspended matter in the mud water by controlling the stirring assembly 8; or, the main control board reduces the concentration of suspended matter in the mud water by controlling the mud discharge assembly 9.

[0069] Specifically, the main control board monitors the suspended matter concentration in the mud water extracted by the reflux pump through the suspended matter concentration detector, and then determines whether the suspended matter concentration of the mud water in the sludge hopper 4 is too high or too low. When it is determined that the suspended matter concentration of the mud water in the sludge hopper 4 is too high, the main control board controls the sludge discharge pump to extract part of the mud water to reduce the suspended matter concentration of the mud water in the sludge hopper 4; when it is determined that the suspended matter concentration of the mud water in the sludge hopper 4 is too low, the main control board controls the stirring element through the stirring motor and the speed regulating element to break up the large particles of sludge to increase the suspended matter concentration of the mud water in the sludge hopper 4; thereby making the suspended matter concentration of the mud water extracted by the reflux pump accurate, which is conducive to further adjusting the suspended matter concentration in the mud water in the mixing buffer tank 2 to meet different suspended matter concentration requirements.

[0070] Reference Figure 1 and Figure 2 In actual application, the reflux fermentation horizontal flow primary sedimentation tank introduces raw sewage through the water inlet tank 1, and the mixing buffer tank 2 mixes the raw sewage introduced from the water inlet tank 1 with the muddy water extracted from the sludge hopper 4. The mixed muddy water is sent to the fermentation tank 5 through the rectifying component 3. The water flow state is controlled by the scraper component 7. The mixed muddy water completes fermentation in the fermentation tank 5 and is pushed to the outlet. The skimmer component 10 collects solid impurities floating in the upper sewage on one side of the outlet. The carbon-containing water without the solid impurities finally flows into the collecting tank and is collected.

[0071] In the above process, the main control board monitors the concentration of suspended matter in the mud water extracted by the reflux pump through the reflux pump component 6, and then controls the stirring component 8 to increase the concentration of suspended matter in the mud water, or the main control board controls the mud discharge component 9 to reduce the concentration of suspended matter in the mud water, thereby ensuring the accuracy of the concentration of suspended matter in the mud water extracted by the reflux pump.

[0072] The present application provides a reflux fermentation horizontal flow primary sedimentation tank, which monitors the suspended matter concentration of the mud water returned from the sludge hopper 4 to the mixing buffer tank 2 through the reflux pump component 6. When the suspended matter concentration is too low, the stirring component 8 is controlled to increase the suspended matter concentration in the sludge hopper 4. When the suspended matter concentration is too high, the sludge discharge component 9 is controlled to reduce the suspended matter concentration in the sludge hopper 4, thereby stabilizing the suspended matter concentration of the mud water returned to the mixing buffer tank 2, and then accurately controlling the suspended matter concentration in the mixing buffer tank 2. The reflux pump does not need to extract sludge with excessively high concentration for a long time, thereby reducing the cost of sewage treatment.

[0073] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0074] The above embodiments are only used to illustrate the technical solution of the present application rather than to limit it. Although the present application has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present application can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present application, which should be included in the scope of the technical solution requested for protection in the present application.

Claims

1. A reflux fermentation advection type primary sedimentation tank, characterized in that: include: A water inlet tank, the water inlet tank is used to introduce raw sewage; A mixing buffer tank, disposed at one side of the water inlet tank and connected thereto; A rectifying member, disposed between the water inlet trough and the mixing buffer tank; A sludge hopper is arranged on the other side of the mixing buffer tank relative to the water inlet tank, the upper part of the sludge hopper is connected to the mixing buffer tank, a stirring component is arranged in the sludge hopper, and a sludge discharge component is also arranged at the bottom of the sludge hopper for sludge discharge; A fermentation tank is arranged on a side of the sludge hopper relatively far from the mixing buffer tank, the fermentation tank is connected to the sludge hopper, and a water outlet is arranged at one end of the fermentation tank far from the sludge hopper; A reflux pump assembly is disposed at the bottom of the sludge hopper so that the bottom of the sludge hopper is connected to the mixing buffer tank, and the reflux pump assembly is used to monitor the concentration of suspended matter in the sludge water returned from the sludge hopper to the mixing buffer tank; The sludge scraping assembly is arranged in the fermentation tank, and is used to control the flow state of water flow and return the settled sludge in the fermentation tank to the sludge hopper.

2. The reflux fermentation advection type primary sedimentation tank according to claim 1, characterized in that: The reflux pump assembly comprises: A reflux pipe, one end of which is connected to the bottom of the sludge hopper and the other end of which is connected to the bottom of the mixing buffer tank; A reflux pump, arranged on the reflux pipe, and used for pumping muddy water in the sludge hopper to the mixing buffer tank; A reflux flow meter, arranged on the reflux pipe and located on one side of the reflux pump, the reflux flow meter is used to count the amount of muddy water pumped by the reflux pump; The suspended matter concentration detector is arranged on the return pipe and located on one side of the return pump. The suspended matter concentration detector is used to monitor the suspended matter concentration in the muddy water extracted by the return pump.

3. The reflux fermentation advection type primary sedimentation tank according to claim 1, characterized in that: The mud discharge assembly comprises; A sludge discharge pipe, one end of which is connected to the bottom of the sludge hopper and the other end of which is connected to a sludge pool; A sludge pump is provided on the sludge discharge pipe, and is used to pump the sludge water in the sludge hopper to the sludge discharge pool; The mud discharge flow meter is arranged on the mud discharge pipe and located on one side of the mud discharge pump. The mud discharge flow meter is used to count the amount of mud and water pumped by the mud discharge pump.

4. The reflux fermentation advection type primary sedimentation tank according to claim 1, characterized in that: Also includes: A main control board, the main control board is electrically connected to the reflux pump assembly, the mud discharge assembly and the stirring assembly, the main control board is used to monitor the concentration of suspended matter in the mud water extracted by the reflux pump through the reflux pump assembly, and then increase the concentration of suspended matter in the mud water by controlling the stirring assembly; or, the main control board reduces the concentration of suspended matter in the mud water by controlling the mud discharge assembly.

5. The reflux fermentation advection type primary sedimentation tank according to claim 1, characterized in that: The scraper assembly comprises: A mud scraper, arranged in the fermentation tank; A mud scraping motor is connected to the mud scraping member, and is used to drive the mud scraping member to move from the mixing buffer tank toward the water outlet.

6. The reflux fermentation advection type primary sedimentation tank according to claim 5, characterized in that: The scraper assembly also includes a support member, at least two of which are fixed in the fermentation tank, and the two support members are respectively located on a side of the scraper member close to the water surface and a side of the scraper member away from the water surface.

7. The reflux fermentation advection type primary sedimentation tank according to claim 1, characterized in that: Also includes: The slag skimming assembly is arranged at one end of the scraping assembly close to the water outlet.

8. The reflux fermentation advection type primary sedimentation tank according to claim 1, characterized in that: Also includes: The water outlet weir plate is arranged on one side of the mud scraper assembly close to the water outlet.

9. The reflux fermentation advection type primary sedimentation tank according to claim 1, characterized in that: Also includes: The water collecting tank is arranged on a side of the water outlet away from the fermentation tank.

10. The reflux fermentation advection type primary sedimentation tank according to any one of claims 1 to 9, characterized in that: The stirring assembly comprises: A stirring member, arranged in the sludge hopper; A stirring motor, the stirring motor is connected to the stirring member, and the stirring motor is used to drive the stirring member to control the concentration of suspended matter in the mud water in the sludge hopper; The speed regulating member is arranged between the stirring member and the stirring motor and is respectively connected to both of them. The speed regulating member is used to control the rotation speed of the stirring member.

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