Online diagnosis method, device and system for running state of MBBR reactor

Abstract

The application is suitable for the technical field of sewage treatment, and provides an online diagnosis method, device and system for the operation state of an MBBR reactor, which comprises the following steps: in a microbial reaction process in the MBBR reactor, the pH of influent water entering an inner barrel and the pH of effluent water flowing from the inner barrel to an outer barrel are measured and acquired in real time; the MBBR reactor comprises the inner barrel and the outer barrel; based on the calculated pH of the influent water and the pH of the effluent water, the difference value change of the pH is calculated in real time; the difference value is dynamically tracked as the pH change value; and based on the pH change value, the microbial reaction state in the MBBR reactor is judged in real time. The application establishes an online diagnosis method for the operation state of the MBBR reactor, and can directly reflect the normal working state of the microbial core part in the MBBR reactor.

Description

Technical Field

[0001] This application belongs to the field of wastewater treatment technology, and in particular relates to an online diagnostic method, device and system for the operating status of an MBBR reactor. Background Technology

[0002] Moving bed bioreactors (MBBRs) are effective in removing chemical oxygen demand (COD), nitrogen (N), and phosphorus (P) pollutants during wastewater treatment. They are an important component of biological treatment technology. COD, N, and P are the most significant pollutants in wastewater treatment, and these pollutants are core indicators for water quality classification. To improve the removal rates of COD, N, and P, researchers have conducted extensive work on the selection and cultivation of microorganisms, the optimization of packing materials, and aeration methods, achieving excellent results.

[0003] However, MBBR reactors are difficult to operate stably. Current analysis and judgment still rely on analyzing water alkalinity and controlling oxygenation to determine adjustments. These traditional indicators can only provide direction from peripheral data and cannot reflect the core status of microbial treatment. Furthermore, alkalinity needs to be measured offline, not online, and although oxygen can be obtained by measuring dissolved oxygen in the water online, the dissolved oxygen in the reactor is unevenly distributed, which often leads to the deterioration of MBBR reactor effluent.

[0004] Therefore, it is urgent to find a macroscopic indicator that directly reflects the normal functioning of the core components of microorganisms and is also easy to detect online. Summary of the Invention

[0005] This application provides an online diagnostic method, apparatus, and system for the operating status of an MBBR reactor, which can directly reflect the normal working status of the microbial core component. An online diagnostic method for the operating status of an MBBR reactor has been established, which can directly reflect the normal working status of the microbial core component in the MBBR reactor.

[0006] This application is achieved through the following technical solution:

[0007] In a first aspect, embodiments of this application provide an online diagnostic method based on the operating status of an MBBR reactor, including:

[0008] During the microbial reaction process inside the MBBR reactor, the influent pH of the wastewater entering the inner tank and the effluent pH of the wastewater flowing from the inner tank to the outer tank are acquired in real time; the MBBR reactor consists of an inner tank and an outer tank.

[0009] Based on the influent pH and effluent pH, calculate the pH change in real time;

[0010] The microbial reaction status within the MBBR reactor is determined in real time based on pH changes.

[0011] In one possible implementation of the first aspect, the microbial reaction status within the MBBR reactor is determined in real time based on pH changes, including:

[0012] When the pH change is greater than 0 and less than or equal to the first set threshold, the microbial reaction in the MBBR reactor is considered normal.

[0013] When the pH change exceeds the first set threshold, the denitrification reaction in the MBBR reactor is determined to be inhibited.

[0014] In one possible implementation of the first aspect, after real-time calculation of pH changes, the online diagnostic method for the operating status of the MBBR reactor further includes:

[0015] When it is determined that the denitrification reaction in the MBBR reactor is inhibited, the aeration rate of the MBBR reactor should be reduced.

[0016] In one possible implementation of the first aspect, the range of the first set threshold is 0.2-0.3.

[0017] In one possible implementation of the first aspect, after real-time calculation of pH changes, the online diagnostic method for the operating status of the MBBR reactor further includes:

[0018] When the pH change exceeds the second set threshold, the MBBR reactor is deemed to have malfunctioned.

[0019] In one possible implementation of the first aspect, after real-time calculation of pH changes, the online diagnostic method for the operating status of the MBBR reactor further includes:

[0020] When the pH change exceeds the second set threshold, the control air pump stops supplying oxygen to the MBBR reactor.

[0021] In one possible implementation of the first aspect, the second set threshold is 0.5.

[0022] In one possible implementation of the first aspect, when it is determined that the denitrification reaction in the MBBR reactor is inhibited, the aeration rate of the MBBR reactor is reduced, including:

[0023] When it is determined that the denitrification reaction in the MBBR reactor is inhibited, the aeration rate of the MBBR reactor is reduced until the pH change is less than or equal to the first set threshold. At the same time, the maximum oxygen content below the throat of the inner tank is controlled to maintain the preset range so that the wastewater in the MBBR reactor remains fluidized. The inner tank has a hyperbolic paraboloid shape.

[0024] Secondly, embodiments of this application provide an online diagnostic device for the operating status of an MBBR reactor, which performs the online diagnostic method for the operating status of an MBBR reactor as described in the first aspect, including:

[0025] The pH acquisition module is used to acquire the influent pH of wastewater entering the inner tank of the MBBR reactor in real time, as well as the effluent pH of wastewater flowing from the inner tank to the outer tank; the MBBR reactor includes an inner tank and an outer tank.

[0026] The pH change tracking module is used to calculate the pH change in real time based on the influent pH and effluent pH.

[0027] The status determination module is used to determine the microbial reaction status in the MBBR reactor in real time based on the pH change.

[0028] Thirdly, embodiments of this application provide an online diagnostic system for the operating status of an MBBR reactor, including an MBBR reactor, an air pump, and a controller; the air pump is used to supply oxygen to the MBBR reactor; the controller performs the online diagnostic method for the operating status of the MBBR reactor as described in the first aspect.

[0029] The advantages of the embodiments in this application compared with related technologies are:

[0030] Based on the principle that aerobic nitrification inevitably tends to decrease the pH value of water, while anoxic denitrification inevitably tends to increase the pH value of water, this application establishes an online diagnostic method for the operating status of the MBBR reactor, using changes in water pH value as an indicator. This method can directly reflect the normal working status of the core microbial components in the MBBR reactor.

[0031] The beneficial effects of the embodiments of the second to fourth aspects described above are the same as those of the embodiments of the first aspect, and will not be repeated here. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This refers to the overall nitrification reaction of microorganisms provided in one embodiment of this application;

[0034] Figure 2 This is a schematic flowchart of an online diagnostic method for the operating status of an MBBR reactor provided in an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the operation of an MBBR reactor according to an embodiment of this application;

[0036] Figure 4 This is a schematic diagram of the structure of an online diagnostic device for the operating status of an MBBR reactor provided in one embodiment of this application;

[0037] Figure 5 This is a schematic diagram of the structure of an online diagnostic system for the operating status of an MBBR reactor provided in an embodiment of this application. Detailed Implementation

[0038] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0039] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0040] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0041] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] References to "an embodiment," "one embodiment," or "some embodiments" as described in this application specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0043] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] The nitrification-denitrification process is the core process involving microorganisms in the MBBR reactor. During the reproduction and metabolism of these microorganisms, the transfer of matter and energy occurs, such as... Figure 1 The diagram illustrates the overall nitrification reaction by microorganisms. During the transfer of matter and energy, pollutants in wastewater are removed, resulting in wastewater purification. In this process, aerobic biological nitrification consumes alkalinity, while anoxic denitrification generates alkalinity. In traditional MBBR reactors, to maximize the effectiveness of simultaneous nitrification and denitrification, alkalinity needs to be measured offline and the oxygen supply adjusted. However, dissolved oxygen is unevenly distributed within the reactor, making precise oxygen control impossible, and determining which reaction sites to control oxygen levels is also challenging.

[0045] Based on the principle that aerobic nitrification inevitably tends to decrease the pH value of water, while anoxic denitrification inevitably tends to increase the pH value of water, this application establishes a criterion using changes in water pH value as an indicator through a large number of simulation experiments, establishes a diagnostic method for the operating status of MBBR reactors, and finds macroscopic indicators that directly reflect the normal operation of the core microbial components.

[0046] Figure 2 This is a schematic diagram of an online diagnostic method for the operating status of an MBBR reactor provided in an embodiment of this application, referring to... Figure 2 The online diagnostic method for the operating status of the MBBR reactor includes:

[0047] Step 101: During the microbial reaction process in the MBBR reactor, the influent pH of the wastewater entering the inner tank and the effluent pH of the wastewater flowing from the inner tank to the outer tank are acquired in real time; the MBBR reactor includes an inner tank and an outer tank.

[0048] In microbial reactors for wastewater treatment, the biological packing material is a perforated biological carrier with a large specific surface area. Once a biofilm forms on the packing material, it acquires the ability to treat wastewater. "Biofilm formation" refers to the formation of a layer of active microorganisms on the surface of the packing material. Aeration causes the wastewater in the reactor to flow between the inner and outer tanks; the inner tank has a lower density, while the outer tank has a higher density. The biological packing material also circulates between the inner and outer tanks along with the water flow. Figure 3 As shown.

[0049] The biofilm layer is typically 1 mm thick. On the outer side of the biofilm, in the outer tank section, nitrification is the primary reaction, while on the inner side, in the inner tank section, denitrification is the primary reaction. Both nitrification and denitrification need to occur simultaneously. If the oxygen supply from the oxygen supply pipe is too high, the oxygen will penetrate the entire biofilm layer, preventing denitrification. The simultaneous presence of both aerobic and anaerobic denitrification layers is the key issue.

[0050] By designing the inner tank into a hyperbolic paraboloid shape, ample space is provided for aerobic reactions, while ensuring uniform oxygen distribution. Furthermore, the hyperbolic paraboloid shape of the inner tank, running vertically through it, shortens the time it takes for air and water to enter the outer tank. This facilitates simultaneous nitrification and denitrification in the inner tank, with nitrification as the dominant reaction, and simultaneously in the outer tank, with denitrification as the dominant reaction, ensuring the successful formation of the microbial layer.

[0051] This embodiment also designs the size ratio of the MBBR reactor. The inner and outer tanks of the MBBR reactor are symmetrically designed. The liquid level in the outer tank is H, the top of the inner tank is controlled within the range of 0.25H to 0.3H from the liquid level, the top of the inner tank is about 1 / 4H from the side of the outer tank, the bottom of the inner tank is about 1 / 6H from the side of the outer tank, and the bottom of the inner tank is about 1 / 6H from the bottom of the outer tank. By controlling the size ratio of the MBBR reactor, the rising velocity field of the inner tank is made consistent, reducing the impact of the MBBR reactor on the microbial reaction process. This helps to achieve simultaneous nitrification and denitrification in the outer tank, with denitrification as the dominant reaction, ensuring the smooth formation of the microbial layer.

[0052] With denitrification in the outer tank as the primary process, the pH level entering the inner tank is objectively guaranteed. This is because the denitrification reaction releases OH-. - This increases the pH value, and air enters the inner tank from the aeration position of the microporous aerator.

[0053] For example, real-time acquisition of the influent pH of wastewater entering the inner tank and the effluent pH of wastewater flowing from the inner tank to the outer tank includes: acquiring the influent pH and effluent pH from a first online pH meter and a second online pH meter, respectively. During the microbial reaction process, the first online pH meter is used to measure the influent pH of wastewater entering the inner tank of the MBBR reactor in real time, and the second online pH meter is used to measure the effluent pH of wastewater flowing from the inner tank to the outer tank in real time.

[0054] The pH of the influent can be obtained from the influent pipe, but optimally it is measured using a first online pH meter. Figure 2 The pH value refers to the portion of the influent pH. The effluent pH can be obtained from the effluent pipe, but optimally, it is measured using a second online pH meter. Figure 3 The pH value of the effluent refers to the pH value of that portion.

[0055] In one embodiment, a first and a second online pH meter are used to assist in judging flow deviation. The MBBR reactor is symmetrical, and controlling the microporous aeration state at the bottom ensures a consistent velocity field as the water rises from the inner tank, while the hyperbolic paraboloid structure guarantees a good velocity field. Flow deviation can easily occur when water and biological carriers circulate out of the inner tank and then re-enter from the bottom. The first and second online pH meters are symmetrically installed on both sides of the MBBR reactor. When the influent pH on one side is lower than the effluent pH on the other side, it indicates that the denitrification reaction intensity is higher on the side with the higher pH. The reason for the higher pH may be due to the higher flow velocity on that side caused by flow deviation, resulting in a higher concentration of packing material on that side, a larger total microbial count on that side, and the release of more OH- after the reaction. - This causes a greater increase in pH. Therefore, the difference in pH between the bottom influent and the bottom influent can help determine the occurrence of flow deviation, thereby balancing the flow velocities on both sides.

[0056] Step 102: Calculate the pH change in real time based on the influent pH and effluent pH.

[0057] Domestic sewage, with an influent pH of 7.6–8.3 and an effluent pH controlled between 7.1 and 7.8, generally contains a relatively high amount of organic matter and pathogenic microorganisms. 进水 pH 出水 In related technologies, many solutions often increase oxygen levels when effluent deteriorates. The inventors discovered that even with sufficient oxygenation, the removal of nitrogen (N) and phosphorus (P) from wastewater is not ideal, and the pH value drops by more than 1. While some organic matter is removed, the results fall short of the target. The treatment effect worsens further as the pH decreases. This is because simultaneous nitrification and denitrification cannot be achieved; the interruption of the denitrification process hinders N and P removal. Furthermore, the decrease in pH disrupts the suitable environment for microbial growth. Microorganisms are crucial; when their growth environment is disrupted, both nitrification and denitrification reactions are severely affected.

[0058] This embodiment uses domestic sewage as the research object. Typical domestic sewage has a weakly alkaline pH, and this weakly alkaline environment is a suitable environment for microbial survival. Domestic sewage generally does not contain phenolphthalein alkalinity but always contains methyl orange alkalinity. When aerobic nitrification occurs, the overall pH decreases. Strong aerobic nitrification produces excess H₂. + This results in excessively low pH levels in the water, which disrupts the suitable environment for microbial survival, leading to the failure of biological treatment. Anaerobic denitrification microbial reactions release OH-. - This increases the pH level. The presence of anaerobic denitrification prevents the pH from dropping too quickly, ensuring that the influent pH is always higher than the effluent pH. The simultaneous existence of nitrification and denitrification not only guarantees efficient treatment but also objectively protects the survival environment of the core microorganisms, enabling them to perform biological treatment of the wastewater.

[0059] For example, the difference between the influent pH and the effluent pH is calculated to obtain the pH change.

[0060] The MBBR reactor operates as a two-phase gas / water circulating fluidized bed, not a direct, single-flow process from influent to effluent. pH change ΔpH = pH 进水 -pH 出水 The pH change is monitored in real time. The air pump is connected to the oxygen supply pipeline. The air pump is started to build a circulating fluidized state. After the circulating fluidization is generated and maintained stably for 2 hours, the pH change is tracked and adjusted.

[0061] Step 103: Based on the pH change, determine the microbial reaction status in the MBBR reactor in real time.

[0062] By controlling the pH changes of the influent and effluent within a set threshold, the simultaneous and stable nitrification and denitrification in the MBBR reactor can be ensured, effectively improving the nitrogen removal performance of the system. The oxygen supply to the reactor can be adjusted in real time according to the pH change, which can avoid unnecessary energy consumption caused by excessive oxygen supply. At the same time, the synergistic process of nitrification and denitrification is more conducive to the consumption of carbon source by denitrifying bacteria, which is beneficial to COD removal.

[0063] For example, based on the amount of pH change, the microbial reaction status in the MBBR reactor is determined in real time, including: when the amount of pH change is greater than 0 and less than or equal to a first set threshold, the microbial reaction in the MBBR reactor is determined to be normal; when the amount of pH change exceeds the first set threshold, the denitrification reaction in the MBBR reactor is determined to be inhibited.

[0064] Preferably, the range of the first set threshold can be 0.2-0.3. When the pH change ΔpH≈0.3, the overall intensity of simultaneous nitrification and denitrification is basically the same, which is a good target state. Therefore, 0.3 can be set as the tracking target value.

[0065] At the beginning of wastewater treatment, ΔpH = 0. Then, the air pump is started to establish a circulating fluidized state. After the circulating fluidization is established and maintained stably for 2 hours, the target value is tracked and adjusted to ΔpH = 0.3.

[0066] For example, after calculating the pH change in real time, the online diagnostic method for the operating status of the MBBR reactor also includes: when it is determined that the denitrification reaction in the MBBR reactor is inhibited, reducing the aeration rate of the MBBR reactor.

[0067] When it is determined that the denitrification reaction in the MBBR reactor is inhibited, the aeration rate of the MBBR reactor is reduced, including: when it is determined that the denitrification reaction in the MBBR reactor is inhibited, the aeration rate of the MBBR reactor is reduced until the pH change is less than or equal to the first set threshold, while controlling the maximum oxygen content below the throat of the inner tank to maintain it within a preset range, so that the wastewater in the MBBR reactor remains fluidized; the inner tank has a hyperbolic paraboloid shape.

[0068] The oxygen level can be measured using an oxygen meter located below the throat of the inner tank.

[0069] For example, when the pH change is less than the first set threshold of 0.3, the aeration rate of the MBBR reactor is maintained. When the pH change exceeds the first set threshold of 0.3, the aeration rate of the MBBR reactor is reduced until the pH change is less than or equal to 0.3, while ensuring that the maximum oxygen content is maintained within the preset range of 2.5 to 3.0 mg / L, thus maintaining the current aeration rate of the MBBR reactor.

[0070] For example, after calculating the pH change in real time, the online diagnostic method for the operating status of the MBBR reactor further includes: determining that the MBBR reactor has malfunctioned when the pH change exceeds a second set threshold.

[0071] For example, after calculating the pH change in real time, the online diagnostic method for the operating status of the MBBR reactor also includes: when the pH change exceeds a second set threshold, controlling the air pump to stop supplying oxygen to the MBBR reactor.

[0072] Preferably, the second set threshold can be set to 0.5. When the ΔpH of the MBBR is greater than 0.5, a malfunction in the MBBR reactor is diagnosed, and the air pump is controlled to stop supplying oxygen to the MBBR reactor. The influent water quality is analyzed, the cause is identified and treated, and then the equipment is restarted.

[0073] In one embodiment, after calculating the pH change in real time, the online diagnostic method for the operating status of the MBBR reactor further includes: when the pH change exceeds a second set threshold, controlling the aeration rate to the minimum aeration rate, wherein the minimum aeration rate is the minimum amount of air that can maintain fluidization.

[0074] After maintaining the minimum aeration rate for a fixed time, if the pH change is less than the second set threshold, the air pump continues to run; if the pH change exceeds the second set threshold after a fixed time, the air pump is controlled to stop supplying oxygen to the MBBR reactor.

[0075] In related technologies, the pH value of influent is adjusted by measuring data such as alkalinity and oxygen content in wastewater to ensure the survival of biological reactions; if the influent pH is high, the pH is lowered. This application, however, investigates how to improve the quality of wastewater treatment through simple methods while ensuring the survival of biological reactions.

[0076] In one embodiment, a domestic sewage simulation experiment was conducted: influent: COD = 215 mg / L, BOD = 99.6 mg / L, TN = 43.1 mg / L, TP = 2.9 mg / L, pH = 8.2. A conventional MBBR was used as a control group. The two reactors were identical, with a packing volume of 30% and a residence time of 10 hours. During operation, the dissolved oxygen near the outlet of the conventional MBBR was finely adjusted to 1.6 mg / L. The online diagnostic system for the MBBR reactor operation status used online pH adjustment to regulate oxygen levels. After 30 days of operation following biofilm formation, the conventional effluent had the following parameters: COD = 60.2–45.2 mg / L, BOD = 17.9–12 mg / L, TN = 21.5–12.9 mg / L, TP = 2.2–2.0 mg / L, and effluent pH = 7.5–8.4. The MBBR reactor operating status is automatically controlled using an online diagnostic method: COD = 47.3–43.8 mg / L, BOD = 14.9–11.2 mg / L, TN = 9.9–8.6 mg / L, TP = 2.1–2.0 mg / L, and effluent pH = 7.8–8.0 mg / L. It is evident that the online diagnostic method for the MBBR reactor operating status in this embodiment is superior to traditional methods, resulting in higher quality and better stability of the treated wastewater.

[0077] In summary, the online diagnostic method for the operating status of the MBBR reactor provided in this application takes the results of microbial reactions as its research direction. Based on the principle that aerobic nitrification inevitably tends to decrease the pH value of the water, while anoxic denitrification inevitably tends to increase the pH value, a criterion is established using pH value changes as an indicator. This reveals the reliable and stable operating status of the MBBR at a more fundamental level. An online diagnostic method for the operating status of the MBBR reactor has been established, which can directly reflect the normal working status of the core microbial components in the MBBR reactor. Utilizing online detection to guide rapid and accurate adjustments to the MBBR operation, this method, starting from the microscopic level and using macroscopic control, finds a scientific, reasonable, economical, and convenient diagnostic and control method to ensure the MBBR is in a reliable operating state. Compared with traditional methods, this further improves effluent quality and reduces energy consumption.

[0078] See Figure 4 This application provides an online diagnostic device for the operating status of an MBBR reactor, which performs the online diagnostic method for the operating status of an MBBR reactor as described above. The device includes a pH acquisition module 301, a pH change tracking module 302, and a status determination module 303.

[0079] pH acquisition module 301 is used to acquire in real time the influent pH of wastewater entering the inner tank of the MBBR reactor, and the effluent pH of wastewater flowing from the inner tank to the outer tank; the MBBR reactor includes an inner tank and an outer tank.

[0080] The pH change tracking module 302 is used to calculate the pH change in real time based on the influent pH and effluent pH.

[0081] The status determination module 303 is used to determine the microbial reaction status in the MBBR reactor in real time based on the pH change.

[0082] In one possible implementation, the state determination module 303 is specifically used to: determine that the microbial reaction in the MBBR reactor is normal when the pH change is greater than 0 and less than or equal to a first set threshold; and determine that the denitrification reaction in the MBBR reactor is inhibited when the pH change exceeds the first set threshold.

[0083] In one possible implementation, the online diagnostic device for the MBBR reactor's operating status further includes an adjustment module. Specifically, after calculating the pH change in real time, the adjustment module reduces the aeration rate of the MBBR reactor when it is determined that the denitrification reaction in the MBBR reactor is inhibited.

[0084] For example, the range of the first set threshold is 0.2-0.3.

[0085] In one possible implementation, the status determination module 303 is further specifically used for: after real-time calculation of pH change, the online diagnostic method for the operating status of the MBBR reactor further includes: when the pH change exceeds a second set threshold, determining that the MBBR reactor has malfunctioned.

[0086] In one possible implementation, the online diagnostic method for the operating status of the MBBR reactor, after real-time calculation of pH changes in the regulation module, further includes: when the pH change exceeds a second set threshold, controlling the air pump to stop supplying oxygen to the MBBR reactor.

[0087] For example, the second threshold is set to 0.5.

[0088] In one possible implementation, in the adjustment module, when it is determined that the denitrification reaction in the MBBR reactor is inhibited, the aeration rate of the MBBR reactor is reduced, including: when it is determined that the denitrification reaction in the MBBR reactor is inhibited, the aeration rate of the MBBR reactor is reduced until the pH change is less than or equal to a first set threshold, while controlling the maximum oxygen content below the throat of the inner tank to maintain it within a preset range, so as to keep the wastewater in the MBBR reactor fluidized; the inner tank has a hyperbolic paraboloid shape.

[0089] After introducing the exemplary implementation methods and apparatus of this application, the following references are made. Figure 5 The online diagnostic system for the operating status of an MBBR reactor according to an exemplary embodiment of this application will be described. The online diagnostic device for the operating status of the MBBR reactor is applied to the online diagnostic method for the operating status of the MBBR reactor provided in any of the above method embodiments. The implementation principle and technical effect are similar, and will not be repeated here.

[0090] See Figure 5 This application provides an online diagnostic system for the operating status of an MBBR reactor, including an MBBR reactor, an air pump, and a controller; the air pump is used to supply oxygen to the MBBR reactor; the controller performs the online diagnostic method for the operating status of the MBBR reactor as described in the first aspect.

[0091] For example, Figure 5 In the middle, the controller is connected to the MBBR reactor, mainly to the first pH online meter and the second pH online meter, to obtain the influent pH of the wastewater entering the inner tank and the effluent pH of the wastewater flowing from the inner tank to the outer tank in real time.

[0092] This embodiment also designs the size ratio of the MBBR reactor. The inner and outer tanks of the MBBR reactor are symmetrically designed. The liquid level in the outer tank is H, the top of the inner tank is controlled within the range of 0.25H to 0.3H from the liquid level, the top of the inner tank is about 1 / 4H from the side of the outer tank, the bottom of the inner tank is about 1 / 6H from the side of the outer tank, and the bottom of the inner tank is about 1 / 6H from the bottom of the outer tank. By controlling the size ratio of the MBBR reactor, the rising velocity field of the inner tank is made consistent, reducing the impact of the MBBR reactor on the microbial reaction process. This helps to achieve simultaneous nitrification and denitrification in the outer tank, with denitrification as the dominant reaction, ensuring the smooth formation of the microbial layer.

[0093] It should be noted that although several units / modules or sub-units / modules of the radar velocity deambiguation device are mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, according to the embodiments of this application, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided and embodied by multiple units / modules.

[0094] Furthermore, although the operations of the method of this application are described in a specific order in the accompanying drawings, this does not require or imply that these operations must be performed in that specific order, or that all the operations shown must be performed to achieve the desired result. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0095] This application also provides a computer-readable storage medium storing computer-executable instructions. When a processor executes the computer-executable instructions, it implements the online diagnostic method for the operating status of the MBBR reactor provided in the above embodiments of this application.

[0096] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0097] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An online diagnosis method for the operating state of an MBBR reactor, characterized in that, The method comprises the following steps: In the microbial reaction process in the MBBR reactor, the influent pH of the wastewater entering the inner barrel and the effluent pH of the wastewater flowing from the inner barrel to the outer barrel are obtained in real time; The MBBR reactor comprises the inner barrel and the outer barrel; The pH change amount is calculated in real time based on the influent pH and the effluent pH; The microbial reaction state in the MBBR reactor is judged in real time based on the pH change amount; The circulating fluidization process of the gas / water two-phase flow is formed inside the MBBR reactor; the influent pH is obtained at the influent pipe of the MBBR reactor; and the effluent pH is obtained at the effluent pipe of the MBBR reactor; The method for judging the microbial reaction state in the MBBR reactor in real time based on the pH change amount comprises the following steps: When the pH change amount is greater than 0 and less than or equal to a first set threshold, it is determined that the microbial reaction in the MBBR reactor is normal; When the pH change amount exceeds the first set threshold, it is determined that the denitrification reaction in the MBBR reactor is inhibited; After the pH change amount is calculated in real time, when it is determined that the denitrification reaction in the MBBR reactor is inhibited, the aeration amount of the MBBR reactor is reduced until the pH change amount is less than or equal to the first set threshold, and the maximum oxygen amount below the throat of the inner barrel is controlled to be within a preset range, so that the wastewater in the MBBR reactor is kept fluidized; the shape of the inner barrel is a hyperbolic paraboloid.

2. The method for on-line diagnosis of the MBBR reactor operating state according to claim 1, characterized in that, The first set threshold is 0.

3.

3. The method for on-line diagnosis of MBBR reactor operation status according to claim 1, characterized in that, After the pH change amount is calculated in real time, the method for diagnosing the operation state of the MBBR reactor on line further comprises the following steps: When the pH change amount exceeds a second set threshold, it is determined that the MBBR reactor operation has a fault.

4. The method for on-line diagnosis of MBBR reactor operation status according to claim 3, characterized in that, After the pH change amount is calculated in real time, the method for diagnosing the operation state of the MBBR reactor on line further comprises the following steps: When the pH change amount exceeds a second set threshold, the air pump is controlled to stop supplying oxygen to the MBBR reactor.

5. The method for on-line diagnosis of the MBBR reactor operating state according to any one of claims 3-4, characterized in that, The second set threshold is 0.

5.

6. An on-line diagnosis device for the operating state of an MBBR reactor, which performs the on-line diagnosis method for the operating state of an MBBR reactor according to any one of claims 1 to 5, characterized in that, The method comprises the following steps: A pH acquisition module is configured to obtain in real time the influent pH of the wastewater entering the inner barrel of the MBBR reactor and the effluent pH of the wastewater flowing from the inner barrel to the outer barrel; The MBBR reactor comprises the inner barrel and the outer barrel; A pH change amount tracking module is configured to calculate in real time the pH change amount based on the influent pH and the effluent pH; A state judgment module is configured to judge in real time the microbial reaction state in the MBBR reactor based on the pH change amount; The circulating fluidization process of the gas / water two-phase flow is formed inside the MBBR reactor; the influent pH is obtained at the influent pipe of the MBBR reactor; and the effluent pH is obtained at the effluent pipe of the MBBR reactor; The state judgment module is specifically configured to: When the pH change amount is greater than 0 and less than or equal to a first set threshold, it is determined that the microbial reaction in the MBBR reactor is normal; When the pH change amount exceeds the first set threshold, it is determined that the denitrification reaction in the MBBR reactor is inhibited.

7. An online diagnosis system for the operating state of an MBBR reactor, characterized in that, The MBBR reactor, the air pump and the controller; the air pump is used for supplying oxygen to the MBBR reactor; the controller executes the online diagnosis method of the running state of the MBBR reactor as claimed in any one of claims 1-5.

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