An automatic pH control UASB reactor

Abstract

The application discloses an automatic pH regulating UASB reactor, which comprises a reactor main body, a regulating mechanism and a reactor shell, a three-phase separator and a feeding pipe, wherein the regulating mechanism comprises a device shell arranged outside the reactor shell, a NaHCO3 storage tank arranged in the device shell and communicated with the inside of the reactor shell through a reflux pipeline and a feeding pipeline in sequence, a stirring assembly arranged in the device shell for continuously stirring the liquid in the reactor shell, a gear pump arranged on the stirring assembly for driving the NaHCO3 storage tank to convey NaHCO3 liquid in the reflux pipeline when the stirring assembly is running, and an adjusting block arranged on the reflux pipeline, the feeding pipeline and the feeding pipe and controlled by a switching assembly to control the pipeline communication. The application can regulate the pH value of the liquid in the UASB reactor, maintain the pH value of the reaction system in a suitable range and effectively guarantee the efficient anaerobic biological treatment of the organic wastewater.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of anaerobic biological treatment of wastewater, in particular to a UASB reactor capable of automatically regulating pH. BACKGROUND

[0002] With the development of society, the discharge of various types of wastewater is increasing day by day. Today, the anaerobic biological treatment of wastewater has developed into a mature wastewater treatment process, which can not only achieve ideal removal of pollutants in wastewater, but also produce clean energy such as methane, and thus is favored. The principle is that the macromolecular organic pollutants in wastewater are degraded into small molecular organic acids, which are further converted into H2 or CH4 by methanogens, so as to realize the removal of organic pollutants in wastewater. In this process, pH is a crucial influencing factor. The optimal survival pH range of anaerobic methanogenic functional microorganisms is mostly between 6.8 and 7.2. When the pH is lower than 6 or higher than 8, the activity of methanogens will be severely inhibited or even die. Therefore, maintaining an appropriate pH in the process of anaerobic biological treatment of wastewater is an important parameter to ensure the normal progress of the treatment process.

[0003] The upflow anaerobic sludge bed (UASB) is a common anaerobic biological treatment device for wastewater. It has been widely used due to its simple structure, high loading rate, short hydraulic retention time, low energy consumption, and the absence of the need for a sludge return device. When using a UASB reactor to treat high-concentration organic wastewater, a large amount of organic matter is rapidly degraded into small-molecular organic acids. When the accumulation rate of small-molecular organic acids is greater than the rate of methanogenesis by methanogens, the organic acids will accumulate inside the reactor, resulting in a decrease in pH. The acidified environment will inhibit the activity of methanogens and reduce their rate of synthesizing methane from small-molecular organic acids, further leading to the accumulation of organic acids, thus forming a vicious cycle, which may eventually result in the collapse of the acidification of the reaction system. Therefore, it is of great significance to improve the UASB reactor and maintain the pH of the reaction system within an appropriate range by real-time regulation of the internal pH, in order to effectively guarantee the efficient anaerobic biological treatment of organic wastewater.

[0004] To this end, the present application provides a UASB reactor capable of automatically regulating pH to solve the above technical problems. SUMMARY

[0005] The main purpose of the present application is to provide a UASB reactor capable of automatically regulating the pH of the liquid inside the reactor, so as to maintain the pH of the reaction system within an appropriate range and effectively guarantee the efficient anaerobic biological treatment of organic wastewater.

[0006] The present application solves the above technical problems by adopting the following technical solutions:

[0007] The utility model provides an automatic pH control UASB reactor, including reactor main part, reactor main part is by reactor shell, three -phase separator and inlet pipe is constituteed, still include the control mechanism who sets up in the outside of reactor main part, the control mechanism includes:

[0008] Device shell is set up in the outside of reactor shell, the PLC control cabinet for controlling the driving operation of electrical structure is set up on the device shell;

[0009] NaHCO3 storage tank is set up in the device shell and is communicated with the inside of reactor shell in turn through reflux pipeline and feeding pipeline;

[0010] Stirring assembly is set up in the device shell for continuously stirring the liquid in the inside of reactor shell;

[0011] Gear pump is set up on the stirring assembly for driving NaHCO3 storage tank to convey NaHCO3 liquid in the reflux pipeline when the stirring assembly operates;

[0012] Adjusting block is set up as three groups and is set up on the reflux pipeline, feeding pipeline and inlet pipe respectively, and the adjusting block controls the pipeline communication of reflux pipeline, feeding pipeline and inlet pipe through switching assembly.

[0013] Preferably, the reflux pipeline is set as a U-shaped pipe, and both ends of the reflux pipeline are set on the NaHCO3 storage tank, and the feeding pipeline is set in the middle of the reflux pipeline.

[0014] Preferably, the stirring assembly includes a rotating shaft rod penetrating through the device shell and the reactor shell, a plurality of graphite carbon rods set on one end of the rotating shaft rod for stirring the liquid in the inside of the reactor shell, and a driving member set in the device shell for driving the rotating shaft rod to rotate.

[0015] Preferably, the gear pump includes a pumping housing set on the reflux pipeline, two sets of pumping gears set in the pumping housing and rotating synchronously with each other, and a limiting rotating shaft set on one of the pumping gears for limiting the rotation of the pumping gear in the pumping housing, and the other set of the pumping gears is set on the rotating shaft rod for synchronous rotation.

[0016] Preferably, the adjusting block is provided with a connecting hole penetrating through both sides, and a sliding plate is slidably arranged on the adjusting block for controlling the communication of both ends of the connecting hole.

[0017] Preferably, the sliding plate is set as a long strip plate, and a through hole is formed in one end of the sliding plate in the same penetrating direction as the connecting hole.

[0018] Preferably, the cross-sectional size of the through hole is larger than that of the connecting hole.

[0019] Preferably, the switching assembly includes a mounting plate that slides within the device housing, a pusher disposed on the device housing for driving the mounting plate to move, and a connecting plate for connecting the sliding plate and multiple sets of mounting plates.

[0020] Preferably, the device housing is equipped with a pH meter for detecting the pH of the liquid inside the reactor housing, and the pH meter probe extends through the device housing and the reactor housing to the inside of the reactor housing.

[0021] This invention provides a UASB reactor with automatic pH control. Compared with existing technologies, the advantages of this invention are as follows:

[0022] 1. This invention, by setting up a pH meter connected to the inside of the reactor body, can quickly sense and obtain the real-time pH value of the liquid inside the reactor body. Based on the pH value information inside the reactor body, an appropriate amount of NaHCO3 liquid is added to the reactor body through the control of the switching component, while the mixed liquid inside the reactor body is continuously stirred. This facilitates rapid pH control of the liquid in the UASB reactor, maintaining the pH value of the reaction system within a suitable range, and effectively ensuring the efficient anaerobic biological treatment of organic wastewater.

[0023] 2. This invention, by setting an adjusting block on the pipeline, utilizes the sliding control of the sliding block on the adjusting block to control the sealing and connection of the connecting hole, thereby controlling the pipeline's transport. It can both act as a regulating switch for pipeline transport and adjust and control the flow rate of liquid transported in the pipeline.

[0024] 3. This invention, by setting up a switching component and utilizing an external PLC to control the operation of the actuator, can synchronously adjust the flow rate of multiple sets of regulating blocks in the pipelines, and synchronously control the blocking and connection of the pipelines. When the return pipeline is blocked, the feeding pipeline and the inlet pipeline are connected, which facilitates the synchronous control of the amount of NaHCO3 liquid added and the amount of wastewater introduced by adjusting the pipeline flow rate during anaerobic biological treatment in the UASB reactor. The adjustment range is wide, ensuring that the pH value in the UASB reactor is always within a suitable range. When the return pipeline is connected, the feeding pipeline and the inlet pipeline are blocked. At this time, the NaHCO3 liquid circulates through the return pipeline and does not enter the UASB reactor, which facilitates the sealed reaction in the UASB reactor.

[0025] 4. The present application is connected to the stirring assembly by the gear pump, using the rotation of the stirring shaft, driving the stirring process in the UASB reactor, while pumping the NaHCO3 liquid in the NaHCO3 liquid tank into the reflux pipeline circulation flow, when the feeding pipeline is connected, the NaHCO3 liquid can enter the UASB reactor for reaction, using the coaxial driving operation of the stirring assembly and the gear pump, the stirring can be carried out while the gear pump is continuously running, which can simplify the overall structure of the device, save the resource of PH control, and improve the efficiency of PH control. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application, serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0027] Figure 1 For the overall perspective view of the present application Figure 1 ;

[0028] Figure 2 For the overall perspective view of the present application Figure 2 ;

[0029] Figure 3 For the overall perspective view of the internal structure of the device shell of the present application

[0030] Figure 4 For the overall perspective view of the internal structure of the device shell of the present application Figure 1 ;

[0031] Figure 5 For the overall perspective view of the internal structure of the device shell of the present application Figure 2 ;

[0032] Figure 6 For the overall perspective view of the internal structure of the device shell of the present application

[0033] Figure 7 For the overall perspective view of the internal structure of the device shell of the present application Figure 1 ;

[0034] Figure 8 For the overall perspective view of the internal structure of the device shell of the present application Figure 2 ;

[0035] Figure 9 For the overall perspective view of the internal structure of the device shell of the present application

[0036] Figure 10 For the overall perspective view of the internal structure of the device shell of the present application

[0037] In the drawings:

[0038] 1, reactor body; 11, feed pipe; 12, three-phase separator; 13, reactor shell;

[0039] 2, regulating mechanism; 21, device shell; 211, PLC control cabinet; 212, PH meter; 22, NaHCO3 storage tank; 23, reflux pipeline; 24, feeding pipeline; 25, stirring assembly; 251, driving piece; 252, rotating shaft; 253, graphite carbon rod; 26, gear pump; 261, pumping shell; 262, pumping gear; 263, limiting rotating shaft; 27, adjusting block; 271, connecting hole; 272, sliding plate; 273, limiting plate; 274, through hole; 28, switching assembly; 281, mounting plate; 282, connecting plate; 283, pushing piece. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The embodiments in the present application and the features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0041] In addition, in the embodiments of the present application, "a plurality of" means two or more. In addition, the technical solutions among the various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope claimed by the present application.

[0042] In the embodiments, see Figures 1 to 10 .

[0043] As shown in Figures 1 to 3 and Figures 6 to 10 , the present application provides a UASB reactor for automatically regulating pH, comprising a reactor body 1, wherein the reactor body 1 is composed of a reactor shell 13, a three-phase separator 12 and a feed pipe 11, and further comprising a regulating mechanism 2 arranged outside the reactor body 1, the regulating mechanism 2 can control the pH of the anaerobic biological treatment environment inside the UASB reactor by regulating the amount of NaHCO3 solution to be put, and the regulating mechanism 2 comprises:

[0044] a device shell 21 arranged outside the reactor shell 13, and a PLC control cabinet 211 arranged on the device shell 21 for controlling the driving operation of the electrical structure;

[0045] A NaHCO3 storage tank 22 is arranged in the device housing 21 and is connected to the inside of the reactor housing 13 through a reflux pipeline 23 and a feeding pipeline 24 in sequence.

[0046] A stirring assembly 25 is arranged in the device housing 21 and is used to continuously stir the liquid in the inside of the reactor housing 13.

[0047] A gear pump 26 is arranged on the stirring assembly 25 and is used to drive the NaHCO3 storage tank 22 to deliver the NaHCO3 liquid in the reflux pipeline 23 when the stirring assembly 25 is running.

[0048] Three sets of adjusting blocks 27 are arranged on the reflux pipeline 23, the feeding pipeline 24 and the feeding pipe 11 respectively, and the adjusting blocks 27 control the pipeline communication of the reflux pipeline 23, the feeding pipeline 24 and the feeding pipe 11 through a switching assembly 28.

[0049] In the specific implementation, the gear pump 26 is connected to the stirring assembly 25, which can pump the NaHCO3 liquid in the NaHCO3 storage tank 22 into the reflux pipeline 23 for circulation while stirring in the UASB reactor. When the feeding pipeline 24 is connected, the NaHCO3 liquid can enter the UASB reactor for reaction. The coaxial driving operation of the stirring assembly 25 and the gear pump 26 can stir while the gear pump 26 is continuously running, which can simplify the overall structure of the device, save the resources for controlling the PH value, improve the efficiency of the device for controlling the PH value, and thus facilitate the quick control of the liquid pH value of the UASB reactor, so as to maintain the pH value of the reaction system in the appropriate range and effectively ensure the efficient anaerobic biological treatment of organic wastewater.

[0050] In the specific implementation, the reflux pipeline 23 is arranged as a U-shaped pipe, and both ends of the reflux pipeline 23 are arranged on the NaHCO3 storage tank 22. One end of the feeding pipeline 24 is arranged in the middle of the reflux pipeline 23, and the other end of the feeding pipeline 24 is connected to the inside of the reactor housing 13.

[0051] As shown in Figure 6 , Figure 9 and Figure 10 , the stirring assembly 25 includes a rotating shaft 252 penetrating the device housing 21 and the reactor housing 13, a plurality of graphite carbon rods 253 arranged at one end of the rotating shaft 252 for stirring the liquid in the inside of the reactor housing 13, and a driving member 251 arranged in the device housing 21 for driving the rotating shaft 252 to rotate.

[0052] In the specific implementation, the stirring assembly 25 controls the plurality of graphite carbon rods 253 to stir in the reactor housing 13, which can ensure that the inside of the reactor is always in a uniform state.

[0053] It should be noted that the above-mentioned driving member 251 can be driven by a servo motor as shown in Figure 9 and Figure 10 The driving member 251 can also be replaced by other publicly disclosed rotation driving structures.

[0054] As shown in Figure 10 The gear pump 26 includes a pumping shell 261 arranged on the return pipeline 23, two sets of pumping gears 262 arranged in the pumping shell 261 and rotating synchronously, and a limiting rotating shaft 263 arranged on one set of pumping gears 262 for limiting the rotation of the pumping gears 262 in the pumping shell 261, and the other set of pumping gears 262 is arranged on the rotating shaft 252 for synchronous rotation.

[0055] When the feeding pipeline 24 is connected, the NaHCO3 liquid can enter the UASB reactor for reaction, and by using the coaxial driving operation of the stirring assembly 25 and the gear pump 26, the stirring can be performed while the gear pump 26 is continuously operating, which can simplify the overall structure of the device, save the resource for controlling the PH value, and improve the efficiency of the device for controlling the PH value.

[0056] It should be noted that the above-mentioned gear pump 26 belongs to the existing publicly disclosed technology in the art, and therefore its specific operation steps, working principle and structural details will not be described here.

[0057] As shown in Figure 4 and Figure 5 The adjusting block 27 is provided with a connecting hole 271 penetrating through both sides, and the sliding block 272 is slidably arranged on the adjusting block 27 for controlling the communication of the connecting hole 271 at both ends.

[0058] In specific implementation, the adjusting block 27 is arranged on the pipeline, and the sliding of the sliding block on the adjusting block 27 can control the plugging and communication of the connecting hole 271, thereby controlling the delivery of the pipeline, which can not only play the role of the control switch of the pipeline delivery, but also control the flow adjustment of the liquid delivery in the pipeline.

[0059] It should be noted that the sliding block 272 can also be provided as a long strip, and one end of the sliding block 272 is provided with a through hole 274 in the same penetrating direction as the connecting hole 271.

[0060] In specific implementation, the sliding of the sliding block on the adjusting block 27 can control the mutual alignment between the connecting hole 271 and the through hole 274, and when aligned, the pipeline is communicated, and when not aligned, the common coverage between the connecting hole 271 and the through hole 274 can control the reduction of the flow or even the plugging of the liquid flow, and the above-mentioned can control the delivery of the pipeline, which can not only play the role of the control switch of the pipeline delivery, but also control the flow adjustment of the liquid delivery in the pipeline.

[0061] In addition, the cross-sectional size of the through hole 274 is preferably larger than that of the connecting hole 271, so as to ensure the flow rate of the NaHCO3 liquid flowing in the pipeline when the sliding plate 272 slides on the adjusting block 27.

[0062] As shown in Figures 3 to 5 , the switching assembly 28 comprises a mounting plate 281 sliding in the device housing 21, a pusher 283 arranged on the device housing 21 for driving the mounting plate 281 to move, and a connecting plate 282 for connecting the sliding plate 272 and the plurality of mounting plates 281.

[0063] Specifically, as shown in Figure 4 and Figure 5 , the sliding plate 272 can also be provided with a limiting plate 273 at both ends for limiting the sliding distance of the sliding plate 272, and the limiting plate 273 at one end can be used to connect with the connecting plate 282.

[0064] In a specific implementation, the switching assembly 28 is arranged, the operation of the pusher 283 is controlled by an external PLC, the pusher 283 is driven, the connecting plate 282 and the plurality of mounting plates 281 are connected, the flow rate of the pipeline of the plurality of adjusting blocks 27 is adjusted synchronously, and the blocking and communication of the pipeline are controlled synchronously. When the reflux pipeline 23 and the feed pipeline 11 are blocked synchronously, the feeding pipeline 24 is connected, the flow rate of the NaHCO3 liquid and the flow rate of the wastewater are controlled synchronously when the UASB reactor is subjected to anaerobic biological treatment, the control range is wide, the PH value in the UASB reactor is ensured to be in an appropriate range, when the reflux pipeline 23 and the feed pipeline 11 are connected, the feeding pipeline 24 is blocked, the NaHCO3 liquid flows in the reflux pipeline 23 and does not enter the UASB reactor, the feed pipeline 11 normally feeds the wastewater, and the UASB reactor is subjected to efficient anaerobic biological reaction.

[0065] It should be noted that the pusher 283 mentioned above can be driven by an electric telescopic rod as shown in Figure 4 and Figure 5 , or other existing disclosed moving driving structures can be used instead.

[0066] As shown in Figure 6 , the device housing 21 is also provided with a PH meter 212 for detecting the PH value of the liquid inside the reactor housing 13, the probe part of the PH meter 212 extends to the inside of the reactor housing 13 through the device housing 21 and the reactor housing 13 in sequence, can record the effluent pH value of the ASB reactor in real time, and the PH meter is electrically connected with the PLC control cabinet 211 for receiving and transmitting the pH value signal in real time for display.

[0067] In specific implementation, the PH meter 212 is arranged to be communicated to the inside of the reactor body 1, and the PLC control cabinet 211 is arranged to receive and display the pH value signal in real time. The real-time pH value and the acid-base degree information of the liquid in the reactor body 1 can be quickly sensed and obtained. Then, according to the pH value and the acid-base degree information of the liquid in the reactor body 1, the appropriate NaHCO3 liquid is put into the reactor body 1 through the control of the switching assembly 28, and the mixed liquid in the reactor body 1 is continuously stirred, so that the liquid acid-base degree of the UASB reactor can be conveniently and quickly adjusted.

[0068] In addition, the specific operation mode of the device includes:

[0069] (1) The pH meter for recording the pH value of the effluent in real time is arranged in the reactor shell, and the PLC control cabinet 211 is electrically connected to receive the corresponding pH value signal in real time.

[0070] (2) The PLC control cabinet 211 controls the driving part 251 to operate, so that the graphite carbon rod 253 continuously stirs in the reactor shell, and the driving part 283 does not operate. The reflux end of the reflux pipeline 23 is connected, the feeding pipeline 24 is blocked, the graphite carbon rod 253 and the gear pump 26 are synchronously operated, the liquid in the reflux pipeline 23 can be normally refluxed into the NaHCO3 liquid tank 22, and the feeding pipe 11 is normally connected to normally perform the anaerobic biological treatment of the organic wastewater in the UASB reactor.

[0071] (3) When the pH value in the reactor shell measured by the pH meter is lower than 6, the PLC control cabinet 211 sends a feedback signal to the driving part 283, the sliding plate 272 slides on the adjusting block 27 to switch between the pipeline blocking and the pipeline dredging, and after the switching, the reflux end of the reflux pipeline 23 and the feeding pipe 11 are blocked, and the feeding pipeline 24 is connected. At this time, the NaHCO3 liquid in the NaHCO3 liquid tank 22 is synchronously operated by the graphite carbon rod 253 and the gear pump 26, and is sent into the reactor shell through the feeding pipeline 24 to adjust the pH value.

[0072] (4) When the pH value in the reactor measured by the pH meter rises to more than 6, the PLC control cabinet 211 sends a feedback signal to the driving part 283, and drives the mounting plate 281 to slowly move to the half-open state of the connecting hole 271 through the driving part 283. When the pH value in the reactor measured by the pH meter rises to more than 6.8, the PLC control cabinet 211 sends a feedback signal to the driving part 283 to drive the feeding pipeline 24 to be blocked, and the NaHCO3 liquid in the reactor shell is stopped.

[0073] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An automatic pH controlled UASB reactor comprising of a reactor body (1) which consists of a reactor shell (13), a three phase separator (12) and a feed inlet pipe (11), characterized in that, Also include the control mechanism (2) set outside the reactor body (1), the control mechanism (2) includes: The device housing (21) is arranged outside the reactor housing (13), and the PLC control cabinet (211) for controlling the driving operation of the electrical structure is arranged on the device housing (21); NaHCO3 liquid tank (22) is arranged in the device housing (21) and communicates with the inside of the reactor housing (13) through the reflux pipeline (23) and the feeding pipeline (24) in turn; The stirring assembly (25) is arranged in the device housing (21) for continuously stirring the liquid in the reactor housing (13); The gear pump (26) is arranged on the stirring assembly (25) for driving the NaHCO3 liquid tank (22) to transport NaHCO3 liquid in the reflux pipeline (23) when the stirring assembly (25) operates; The adjusting block (27) is arranged in three groups and arranged on the reflux pipeline (23), the feeding pipeline (24) and the feeding pipe (11) respectively, and the adjusting block (27) controls the pipeline communication of the reflux pipeline (23), the feeding pipeline (24) and the feeding pipe (11) through the switching assembly (28); The reflux pipeline (23) is arranged as a U-shaped pipe, both ends of the reflux pipeline (23) are arranged on the NaHCO3 liquid tank (22), and the feeding pipeline (24) is arranged in the middle of the reflux pipeline (23); The adjusting block (27) is arranged with a connecting hole (271) penetrating through both sides, and the sliding plate (272) for controlling the communication of both ends of the connecting hole (271) is slidably arranged on the adjusting block (27); The sliding plate (272) is arranged as a long strip plate, and a through hole (274) with the same penetrating direction as the connecting hole (271) is formed in one end of the sliding plate (272); The switching assembly (28) includes a mounting plate (281) slidably arranged in the device housing (21), a pushing piece (283) arranged on the device housing (21) for driving the mounting plate (281) to move, and a connecting plate (282) for connecting the sliding plate (272) and the mounting plate (281); When the reflux pipeline (23) and the feeding pipe (11) are synchronously blocked, the feeding pipeline (24) is connected; When the reflux pipeline (23) and the feeding pipe (11) are connected, the feeding pipeline (24) is blocked.

2. The auto-regulated pH UASB reactor according to claim 1, wherein, The stirring assembly (25) includes a rotating shaft (252) penetrating through the device housing (21) and the reactor housing (13), a plurality of graphite carbon rods (253) arranged at one end of the rotating shaft (252) for stirring the liquid in the reactor housing (13), and a driving piece (251) arranged in the device housing (21) for driving the rotating shaft (252) to rotate.

3. The auto-regulated pH UASB reactor according to claim 2, wherein, The gear pump (26) comprises a pumping shell (261) arranged on the return pipeline (23), two groups of pumping gears (262) arranged in the pumping shell (261) and rotating synchronously, and a limiting rotating shaft (263) arranged on one group of the pumping gears (262) and used for limiting the rotation of the pumping gears (262) in the pumping shell (261), and the other group of the pumping gears (262) is arranged on the rotating shaft rod (252) and used for synchronous rotation.

4. The auto-regulated pH UASB reactor of claim 1, wherein, The through hole (274) has a cross section larger than the connecting hole (271).

5. The auto-regulated pH UASB reactor as claimed in claim 1, wherein, The device shell (21) is provided with a pH meter (212) for detecting the pH value of the liquid in the reactor shell (13), and the probe of the pH meter (212) extends to the inside of the reactor shell (13) through the device shell (21) and the reactor shell (13) in sequence.

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