CN218665639U - Automatic sludge discharge device - Google Patents

Abstract

The utility model relates to an automatic eduction gear of mud, including sewage treatment pond, sedimentation tank, mud level detector, sludge discharge pump, backwash pump and controller. A sludge level detector for detecting the sludge level of the sludge is arranged in the sedimentation tank, and when the sludge level of the sludge is greater than the highest warning sludge level, the sludge discharge pump is controlled to be started to discharge the sludge in the sedimentation tank in time, so that the normal operation of the sedimentation tank is prevented from being influenced; when the sludge level of the sludge is between the highest warning sludge level and the lowest warning sludge level, controlling a sludge discharge pump and a reflux pump to be started, so that one part of the sludge can be discharged and the other part of the sludge can be discharged into a sewage treatment tank, and ensuring that the sedimentation tank always runs normally; when the mud level of mud is less than minimum warning mud level, control sludge pump and backwash pump are closed, stop sludge pump and discharge mud and stop the backwash pump and discharge mud to the sewage treatment pond, ensure that the discharge amount of mud can not too big also can not the undersize to ensure the normal operating of sedimentation tank and avoid taking place to turn over mud.

Description

Automatic sludge discharge device

Technical Field

The utility model relates to the technical field of sewage treatment, especially, relate to an automatic discharging equipment of mud.

Background

Generally, a mud-water mixture obtained after sewage is treated by a sewage treatment tank is precipitated in a sedimentation tank to form sludge, and if the sludge is not discharged in time, the operation of the sedimentation tank is affected.

However, when the sludge discharge amount is too large, the water inflow of the sedimentation tank is increased to cause a sludge turning phenomenon, and when the sludge discharge amount is small, the sludge in the sedimentation tank is excessively deposited to influence the operation of the sedimentation tank.

SUMMERY OF THE UTILITY MODEL

In order to solve the above technical problem or at least partially solve the above technical problem, the present disclosure provides an automatic sludge discharge device.

The utility model provides an automatic sludge discharge device, which comprises a sewage treatment tank, a sedimentation tank, a sludge level detector, a sludge discharge pump, a reflux pump and a controller;

the sewage treatment tank is provided with a treatment inlet for sewage to enter so that the sewage is treated in the sewage treatment tank to form a mud-water mixture, and the sewage treatment tank is provided with a treatment outlet for discharging the mud-water mixture;

the sedimentation tank is provided with a sedimentation inlet communicated with the treatment outlet so that the mud-water mixture is separated in the sedimentation tank to form supernatant and sludge; the sedimentation tank is provided with a first outlet through which the supernatant can be discharged and a sludge outlet through which the sludge can be discharged; the sludge discharge pump is communicated with the sedimentation tank and is used for discharging the sludge from the sludge outlet; the reflux pump is respectively communicated with the sedimentation tank and the sewage treatment tank and is used for discharging the sludge into the sewage treatment tank;

the sludge level detector is arranged in the sedimentation tank and is used for detecting the sludge level of the sludge in the sedimentation tank; the controller is respectively connected with the sludge level detector, the sludge discharge pump and the reflux pump, and is used for controlling the working state of the sludge discharge pump and the reflux pump according to the sludge level so as to enable the sludge level of the sludge in the sedimentation tank to be within a preset range.

According to an embodiment of the disclosure, a sedimentation inclined pipe is arranged in the sedimentation tank and is close to the sedimentation inlet so as to perform sedimentation separation on the sludge-water mixture to form the supernatant and the sludge.

According to one embodiment of the disclosure, a filter screen is arranged in the sewage treatment tank, and the filter screen is close to the treatment inlet; or a filter screen is arranged at the treatment inlet.

According to an embodiment of the present disclosure, the automatic sludge discharge device further comprises a regulating tank, the regulating tank is provided with a regulating inlet for sewage to enter and a regulating outlet for sewage to discharge, and the regulating outlet is communicated with the treatment inlet.

According to one embodiment of the present disclosure, the automatic sludge discharge device further comprises a water inlet pipe, one end of the water inlet pipe is communicated with the adjusting outlet, and the other end of the water inlet pipe is communicated with the treatment inlet;

and a lifting pump is arranged in the regulating tank.

According to one embodiment of the present disclosure, the sewage treatment tank comprises at least two treatment tanks, and the at least two treatment tanks are sequentially communicated; the treatment inlet is arranged on the treatment tank which is close to the upstream of at least two treatment tanks, and the treatment outlet is arranged on the treatment tank which is close to the downstream of at least two treatment tanks.

According to one embodiment of the present disclosure, the at least two treatment tanks include a pretreatment tank, an anaerobic tank, an anoxic tank, and an aerobic tank, which are sequentially communicated from an upstream side to a downstream side; the treatment inlet is arranged on the pretreatment tank, and the treatment outlet is arranged on the aerobic tank.

According to an embodiment of the present disclosure, a stirring device is arranged in the anoxic tank, and the reflux pump is respectively communicated with the anoxic tank and the sedimentation tank, so that the sludge in the sedimentation tank is discharged into the anoxic tank under the action of the reflux pump.

According to an embodiment of the present disclosure, the automatic sludge discharge device further comprises a clean water tank, the clean water tank is located above the sedimentation tank and is communicated with the first outlet, and the clean water tank is provided with a clean water outlet through which the supernatant can be discharged;

and/or the automatic sludge discharging device further comprises a sludge fermentation tank, and the sludge fermentation tank is provided with a fermentation inlet communicated with the sludge outlet and a fermentation outlet communicated with the treatment inlet.

According to an embodiment of the present disclosure, the automatic sludge discharge device further includes a first electromagnetic valve and a second electromagnetic valve, the first electromagnetic valve and the second electromagnetic valve are both electrically connected to the controller, the first electromagnetic valve is connected to the reflux pump, and the second electromagnetic valve is connected to the sludge discharge pump.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the utility model provides an automatic eduction gear of mud, including sewage treatment pond, sedimentation tank, mud level detector, dredge pump, backwash pump and controller. The method comprises the following steps that a sludge level detector for detecting the sludge level of sludge is arranged in a sedimentation tank, the sewage treatment tank is provided with a treatment inlet through which sewage can enter, so that the sewage is treated in the sewage treatment tank to form a mud-water mixture, and the sewage treatment tank is provided with a treatment outlet through which the mud-water mixture can be discharged; the sedimentation tank is provided with a sedimentation inlet communicated with the treatment outlet so that the mud-water mixture is separated in the sedimentation tank to form supernatant and sludge; the sedimentation tank is provided with a first outlet for discharging supernatant and a sludge outlet for discharging sludge; the sludge discharge pump is communicated with the sedimentation tank and is used for discharging sludge from the sludge outlet; the reflux pump is respectively communicated with the sedimentation tank and the sewage treatment tank and is used for discharging sludge into the sewage treatment tank; the mud level detector is arranged in the sedimentation tank and used for detecting the mud level of the sludge in the sedimentation tank; the controller is connected with mud level detector, sludge discharge pump and backwash pump respectively, and the controller is used for controlling the operating condition of sludge discharge pump and backwash pump according to mud level to the discharge amount of control mud, so that the mud level of mud in the sedimentation tank is in predetermineeing the within range, is in reasonable within range with the mud level of guaranteeing the mud in the sedimentation tank, guarantees promptly that the discharge amount of mud can not too big also can not the undersize, in order to guarantee the normal operating of sedimentation tank and avoid taking place to turn over mud.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of an automatic sludge discharge device according to an embodiment of the disclosure.

Wherein, 1, a sewage treatment tank; 11. a process inlet; 12. a filter screen; 13. a regulating tank; 131. adjusting the inlet; 132. adjusting the outlet; 133. a water inlet pipe; 14. a lift pump; 15. a pretreatment tank; 16. an anaerobic tank; 17. an anoxic tank; 171. a stirring device; 18. an aerobic tank; 19. a clean water tank; 191. a water distribution area; 2. a sedimentation tank; 21. a sludge outlet; 22. a settling inclined tube; 23. a water outlet pipe; 3. a mud level detector; 4. a sludge discharge pump; 5. a reflux pump; 6. a controller; 61. a data acquisition module; 7. a sludge fermentation tank; 71. a fermentation inlet; 81. a first solenoid valve; 82. a second solenoid valve.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

Referring to fig. 1, the present embodiment provides an automatic sludge discharge device, which includes a sewage treatment tank 1, a sedimentation tank 2, a sludge level detector 3, a sludge discharge pump 4, a reflux pump 5, and a controller 6.

Wherein, the sewage treatment tank 1 is provided with a treatment inlet 11 for sewage to enter so that the sewage is treated in the sewage treatment tank 1 to form a mud-water mixture, and the sewage treatment tank 1 is provided with a treatment outlet for discharging the mud-water mixture.

During specific implementation, activated sludge is arranged in the sewage treatment tank 1, and microorganisms with different functionalities in the activated sludge can remove organic matters in sewage and perform denitrification and dephosphorization reactions, so that the sewage forms a sludge-water mixture in the sewage treatment tank 1.

Wherein the sedimentation tank 2 is provided with a sedimentation inlet communicated with the treatment outlet so that the mud-water mixture is separated in the sedimentation tank 2 to form supernatant and sludge. In a specific implementation, the sedimentation tank 2 may be provided with a water distribution area 191, so that the mud-water mixture flows from top to bottom and then undergoes sedimentation separation to form supernatant and sludge, the supernatant is discharged through the first outlet of the sedimentation tank 2, and the sludge is settled at the bottom of the sedimentation tank 2 and then discharged from the sludge outlet 21 according to an actually required discharge amount.

Wherein, the sludge pump 4 is communicated with the sedimentation tank 2, and the sludge pump 4 is used for discharging sludge from the sludge outlet 21. That is, in the actual treatment process, the sludge settled in the sedimentation tank 2 can have two treatment modes, one is that a part of the sludge is directly discharged from the sludge outlet 21 under the action of the sludge discharge pump 4; the other is that the other part of the sludge is discharged to the sewage treatment tank 1 for further treatment. Therefore, a sludge discharge pump 4 can be arranged in the sedimentation tank 2, so that sludge in the sedimentation tank 2 is pumped out from a sludge discharge outlet; set up backwash pump 5 in addition between sedimentation tank 2 and sewage treatment pond 1, perhaps set up backwash pump 5 in sedimentation tank 2 or in sewage treatment pond 1, backwash pump 5 communicates with sedimentation tank 2 and sewage treatment pond 1 respectively, and backwash pump 5 is used for making mud discharge to sewage treatment pond 1 in.

The mud level detector 3 is arranged in the sedimentation tank 2 and used for detecting the mud level of the mud in the sedimentation tank 2, and the controller 6 is used for controlling the working states of the mud pump 4 and the reflux pump 5 according to the mud level so as to enable the mud level of the mud in the sedimentation tank 2 to be within a preset range.

The mud level detector 3 may be an ultrasonic mud level meter. The working principle of the ultrasonic mud gauge is as follows: the ultrasonic sensor immersed in water sends a beam of ultrasonic waves to the water bottom, the ultrasonic waves can be reflected after encountering suspended and precipitated sludge in the downward propagation process, the signal intensity reflected by sludge layers with different densities is different, the ultrasonic signal intensity and time reflected by the instrument are detected, and the depth or thickness of a sludge interface can be obtained through treatment.

Specifically, when the detected sludge level is greater than the highest warning sludge level, the controller 6 controls the sludge discharge pump 4 to be opened and the reflux pump 5 to be closed, and at the moment, the sludge in the sedimentation tank 2 can be discharged through the sludge outlet 21. When the detected sludge level is between the highest warning sludge level and the lowest warning sludge level, the controller 6 controls the sludge discharge pump 4 and the reflux pump 5 to be started, at the moment, one part of sludge in the sedimentation tank 2 can be discharged from the sludge outlet 21 under the action of the sludge discharge pump 4, and the other part of sludge in the sedimentation tank 2 is discharged into the sewage treatment tank 1 for further treatment under the action of the reflux pump 5; when the detected sludge level is less than the lowest warning sludge level, the sludge discharge pump 4 and the reflux pump 5 are controlled to be closed, and the sludge discharge is stopped, so that the sludge in the sedimentation tank 2 can be gradually deposited to a certain sludge level, and the sludge turning phenomenon caused by the lower sludge level is avoided.

During specific implementation, the discharge control process of the sludge in the sedimentation tank 2 is as follows:

firstly, the setting sedimentation tank 2 is provided with an optimal mud level H2, a highest warning mud level H1 and a lowest warning mud level H3. When the sludge level of the sludge in the sedimentation tank 2 reaches the highest warning sludge level H1, the sludge discharge pump 4 is started to discharge the sludge, so that the phenomena of sludge aging, sludge turning and the like caused by untimely sludge discharge are avoided, and the sludge discharge pump 4 is stopped to operate until the sludge level reaches the optimal sludge level H2.

When the sludge level of the sludge in the sedimentation tank 2 is between the highest warning sludge level H1 and the lowest warning sludge level H3, the reflux pump 5 is started to reflux the sludge, so as to supplement the amount of the activated sludge in the biochemical area, accelerate the growth and the propagation of microorganisms and ensure the sewage treatment effect.

When the mud level reaches the lowest warning mud level H3, the reflux pump 5 and the sludge discharge pump 4 stop running, so that the problem that the mud level is too low to cause the inflow rate and the flow speed of the sedimentation tank 2 to increase and the mud turning condition is easy to occur to influence the water quality of the discharged water is avoided.

Further, the sewage treatment device of the embodiment may further include a data acquisition module 61, the data acquisition module 61 is communicated with the sludge level detector 3, so as to obtain the sludge level of the sludge in the sedimentation tank 2 collected by the sludge level detector 3, compare the sludge level with the highest warning sludge level and the lowest warning sludge level of the sludge level, and send the comparison result to the controller 6 connected to the data acquisition module 61, and the controller 6 controls the working states of the sludge discharge pump 4 and the reflux pump 5 according to the comparison result.

Optionally, the reflux pump 5 is preferably a centrifugal pump, a mixed flow pump, a submersible pump, a screw pump or an air lifter.

That is to say, the automatic sludge discharge device provided in this embodiment arranges the sludge level detector 3 for detecting the sludge level in the sedimentation tank 2, so that when the detected sludge level of the sludge is greater than the highest warning sludge level, the sludge discharge pump 4 is controlled to be turned on, so that the sludge in the sedimentation tank 2 is discharged in time, and the normal operation of the sedimentation tank 2 is prevented from being affected; when the detected sludge level of the sludge is between the highest warning sludge level and the lowest warning sludge level, the sludge discharge pump 4 and the reflux pump 5 can be controlled to be started, so that one part of the sludge can be discharged, and the other part of the sludge can be discharged into the sewage treatment tank 1, and the sedimentation tank 2 is ensured to be normally operated all the time; when the mud level of the mud that obtains when detecting is less than minimum warning mud level, control sludge pump 4 and backwash pump 5 were closed this moment to stop sludge pump 4 with mud discharge and stop backwash pump 5 with mud discharge to sewage treatment pond 1, in order to avoid reducing the mud in the sedimentation tank 2, make the mud in the sedimentation tank 2 can deposit to certain mud level gradually, thereby avoid because the mud level is lower leads to turning over the phenomenon of mud. That is to say, this automatic eduction gear of mud of this disclosure, can be through the mud level of the mud in the mud level detector 3 real-time detection sedimentation tank 2 to control mud pump 4 and backwash pump 5's operating condition, in order to ensure that the mud level of the mud in the sedimentation tank 2 is in reasonable within range, ensure that the discharge amount of mud can not too big also can not the undersize promptly, in order to ensure sedimentation tank 2's normal operating and avoid taking place to turn over mud.

The mud level detector 3 and the controller 6 are used for realizing more refined control of sludge backflow and excess sludge discharge, and the operation stability and the sewage treatment effect of the automatic sludge discharge device are improved.

Referring to fig. 1, in some embodiments, a settling chute 22 is disposed in the settling tank 2, and the settling chute 22 is close to the settling inlet to perform settling separation on the sludge-water mixture to form supernatant and sludge.

Referring to fig. 1, in some embodiments, a filter screen 12 is disposed in the wastewater treatment tank 1, and the filter screen 12 is close to the treatment inlet 11; or, a filter screen 12 is arranged at the treatment inlet 11. Large-particle pollutants in the sewage can be effectively removed by arranging the filter screen 12. Illustratively, the filter 12 may be a stainless steel filter 12 to prevent rust from affecting the application.

Referring to fig. 1, in some embodiments, the automatic sludge discharging apparatus further includes a regulating tank 13, the regulating tank 13 has a regulating inlet 131 for allowing sewage to enter and a regulating outlet 132 for discharging sewage, and the regulating outlet 132 is communicated with the treatment inlet 11. In specific implementation, the sewage enters the adjusting tank 13 through the pipe network and then enters the sewage treatment tank 1 through the water inlet pipe 133 via the lift pump 14 for treatment.

Specifically, the automatic sludge discharge device further comprises a water inlet pipe 133, one end of the water inlet pipe 133 is communicated with the adjusting outlet 132, and the other end of the water inlet pipe 133 is communicated with the treatment inlet 11; a lift pump 14 is arranged in the adjusting tank 13, so that the sewage in the adjusting tank 13 can flow through the water inlet pipe 133 under the action of the lift pump 14 and finally enter the sewage treatment tank 1 for treatment.

Referring to fig. 1, in some embodiments, a wastewater treatment tank 1 includes at least two treatment tanks, which are in communication in series; the treatment inlet 11 is provided on a treatment tank near the upstream of the at least two treatment tanks, and the treatment outlet is provided on a treatment tank near the downstream of the at least two treatment tanks.

In the concrete implementation, the at least two treatment tanks comprise a pretreatment tank 15, an anaerobic tank 16, an anoxic tank 17 and an aerobic tank 18 which are sequentially communicated and arranged along the upstream side to the downstream side; the treatment inlet 11 is arranged on the pretreatment tank 15, and the treatment outlet is arranged on the aerobic tank 18.

Referring to fig. 1, in some embodiments, an agitating device 171 is disposed in the anoxic tank 17, and the reflux pump 5 is respectively communicated with the anoxic tank 17 and the sedimentation tank 2, so that sludge in the sedimentation tank 2 is discharged into the anoxic tank 17 under the action of the reflux pump 5.

In this embodiment, by adding the stirring device 171 to the anoxic tank 17, a part of the sludge in the sedimentation tank 2 is discharged into the anoxic tank 17 and contacts with the sewage in the anoxic tank 17 more uniformly, so that the sewage treatment effect can be improved. Meanwhile, nitrate nitrogen carried in the sludge flowing back to the anoxic tank 17 can be recovered with partial alkalinity and oxygen demand in the denitrification process of the anoxic tank 17, so that the nitrate nitrogen in the returned sludge can be removed, excessive nitrate nitrogen can be prevented from entering the anaerobic tank 16 to compete with phosphorus-releasing bacteria for carbon sources, and the nitrogen and phosphorus removal effect of the sewage is improved.

In some embodiments, referring to fig. 1, the automatic sludge discharging apparatus further includes a sludge fermentation tank 7, and the sludge fermentation tank 7 has a fermentation inlet 71 communicating with the sludge outlet 21 and a fermentation outlet communicating with the treatment inlet 11. During specific implementation, the residual sludge in the sedimentation tank 2 is discharged to the sludge fermentation tank 7, the purpose is to perform sludge fermentation treatment in the sludge fermentation tank 7, and carbon sources required by a biochemical system can be supplemented by anaerobic fermentation acid production, so that the adding amount of external carbon sources can be reduced, and the sewage treatment cost is reduced.

In this embodiment, the automatic sludge discharging device further includes a clean water tank 19, the clean water tank 19 is located above the sedimentation tank 2 and is communicated with the first outlet, the clean water tank 19 has a clean water outlet through which the supernatant can be discharged, and the supernatant separated and formed in the sedimentation tank 2 can be discharged from the clean water outlet.

Referring to fig. 1, in some embodiments, the automatic sludge discharging apparatus further includes a first solenoid valve 81 and a second solenoid valve 82, the first solenoid valve 81 is connected to the reflux pump 5 and the controller 6, respectively, and the second solenoid valve 82 is connected to the sludge discharge pump 4 and the controller 6, respectively.

In specific implementation, when the reflux pump 5 needs to be opened, the controller 6 may control the first electromagnetic valve 81 to be opened so as to open the reflux pump 5; or when it is necessary to turn off the return pump 5, the controller 6 may control the first solenoid valve 81 to be closed so as to turn off the return pump 5. Accordingly, when it is required to turn on the dredge pump 4, the controller 6 may control the second electromagnetic valve 82 to be turned on so as to turn on the dredge pump 4; or when it is required to turn off the sludge pump 4, the controller 6 may control the second solenoid valve 82 to be closed so as to turn off the sludge pump 4.

In summary, the treatment process of the automatic sludge discharge device provided by the embodiment may be as follows: sewage gets into equalizing basin 13 through the pipe network, gets into pretreatment tank 15 through inlet tube 133 via elevator pump 14 again, and pretreatment tank 15 sets up the stainless steel screen cloth and gets rid of the large granule pollutant, passes through anaerobism, oxygen deficiency, good oxygen biological treatment in proper order afterwards, gets rid of organic pollutant and carries out nitrogen and phosphorus removal reaction. Activated sludge is put into the anaerobic tank 18, the anoxic tank 18 and the aerobic tank, and different functional microorganisms in the activated sludge remove pollutants. The mud-water mixture after the aerobic aeration treatment enters a sedimentation tank 2, a water distribution area 191 is arranged at the left side of the sedimentation tank 2, the mud-water mixture flows from top to bottom, enters a sedimentation inclined pipe 22 from bottom to top after passing through a bottom perforated wall, is separated after being precipitated by the sedimentation inclined pipe 22, supernatant enters a clean water tank 19 and is discharged by a water outlet pipe 23, and sludge is precipitated by the sedimentation inclined pipe 22 and then enters the bottom of the sedimentation tank 2 for sedimentation.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

The previous description is only for the purpose of describing particular embodiments of the present disclosure, so as to enable those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An automatic sludge discharge device is characterized by comprising a sewage treatment tank (1), a sedimentation tank (2), a sludge level detector (3), a sludge discharge pump (4), a reflux pump (5) and a controller (6);

the sewage treatment tank (1) is provided with a treatment inlet (11) for sewage to enter so that the sewage is treated in the sewage treatment tank (1) to form a muddy water mixture, and the sewage treatment tank (1) is provided with a treatment outlet for discharging the muddy water mixture;

the sedimentation tank (2) is provided with a sedimentation inlet communicated with the treatment outlet so as to separate the mud-water mixture into supernatant and sludge in the sedimentation tank (2); the sedimentation tank (2) is provided with a first outlet for discharging the supernatant and a sludge outlet (21) for discharging the sludge; the sludge pump (4) is communicated with the sedimentation tank (2), and the sludge pump (4) is used for discharging the sludge from the sludge outlet (21); the reflux pump (5) is respectively communicated with the sedimentation tank (2) and the sewage treatment tank (1), and the reflux pump (5) is used for discharging the sludge into the sewage treatment tank (1);

the mud level detector (3) is arranged in the sedimentation tank (2) and is used for detecting the mud level of the sludge in the sedimentation tank (2); the controller (6) is respectively connected with the sludge level detector (3), the sludge discharge pump (4) and the reflux pump (5), and the controller (6) is used for controlling the working states of the sludge discharge pump (4) and the reflux pump (5) according to the sludge level so as to control the discharge amount of the sludge and enable the sludge level of the sludge in the sedimentation tank (2) to be within a preset range.

2. The automatic sludge discharge device according to claim 1, wherein a precipitation inclined pipe (22) is arranged in the sedimentation tank (2), and the precipitation inclined pipe (22) is close to the precipitation inlet so as to precipitate and separate the sludge-water mixture into the supernatant and the sludge.

3. The automatic sludge discharge device according to claim 1, wherein a filter screen (12) is arranged in the sewage treatment tank (1), and the filter screen (12) is close to the treatment inlet (11); or a filter screen (12) is arranged at the treatment inlet (11).

4. The automatic sludge discharging device according to claim 1, further comprising a regulating tank (13), wherein the regulating tank (13) is provided with a regulating inlet (131) for sewage to enter and a regulating outlet (132) for sewage to discharge, and the regulating outlet (132) is communicated with the treatment inlet (11).

5. The automatic sludge discharging device as claimed in claim 4, further comprising a water inlet pipe (133), wherein one end of the water inlet pipe (133) is communicated with the adjusting outlet (132), and the other end of the water inlet pipe (133) is communicated with the treatment inlet (11);

and a lifting pump (14) is arranged in the adjusting tank (13).

6. The automatic sludge discharger according to any of claims 1 to 5 wherein the sewage treatment tank (1) comprises at least two treatment tanks, at least two treatment tanks being in communication in series; the treatment inlet (11) is arranged on the treatment tank near the upstream of at least two treatment tanks, and the treatment outlet is arranged on the treatment tank near the downstream of at least two treatment tanks.

7. The automatic sludge discharge device according to claim 6, wherein the at least two treatment tanks comprise a pretreatment tank (15), an anaerobic tank (16), an anoxic tank (17) and an aerobic tank (18) which are sequentially communicated from the upstream side to the downstream side; the treatment inlet (11) is arranged on the pretreatment tank (15), and the treatment outlet is arranged on the aerobic tank (18).

8. The automatic sludge discharging device according to claim 7, wherein a stirring device (171) is arranged in the anoxic tank (17), and the reflux pump (5) is respectively communicated with the anoxic tank (17) and the sedimentation tank (2) so as to discharge the sludge in the sedimentation tank (2) into the anoxic tank (17) under the action of the reflux pump (5).

9. The automatic sludge discharger according to any of claims 1 to 5, further comprising a clean water tank (19), wherein the clean water tank (19) is located above the sedimentation tank (2) and communicates with the first outlet, and the clean water tank (19) has a clean water outlet through which the supernatant can be discharged;

and/or the automatic sludge discharging device further comprises a sludge fermentation tank (7), wherein the sludge fermentation tank (7) is provided with a fermentation inlet (71) communicated with the sludge outlet (21) and a fermentation outlet communicated with the treatment inlet (11).

10. The automatic sludge discharging device according to any one of claims 1 to 5, further comprising a first solenoid valve (81) and a second solenoid valve (82), wherein the first solenoid valve (81) and the second solenoid valve (82) are both electrically connected with the controller (6), the first solenoid valve (81) is connected with the reflux pump (5), and the second solenoid valve (82) is connected with the sludge discharge pump (4).

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