Laboratory equipment for verifying the effect of pH on wastewater denitrification processes

Abstract

This invention discloses a laboratory apparatus for verifying the effect of pH on wastewater denitrification processes, relating to the technical field of wastewater treatment experimental equipment. It includes a wastewater denitrification reactor, a pH adjustment mechanism, and an inlet / outlet mechanism. The pH adjustment mechanism includes a pH sensor and a metering pump. The pH sensor detects the pH value of the nitrogen-containing experimental wastewater within the reactor body of the wastewater denitrification reactor, and the metering pump pumps a pH adjuster into the reactor body to maintain the pH value of the nitrogen-containing experimental wastewater. This invention primarily addresses the problem of providing laboratory equipment for verifying the effect of pH on wastewater denitrification processes. It can deeply reveal how pH affects the activity, enzyme function, and gene expression of microorganisms in traditional nitrification-denitrification processes, short-cut nitrification-denitrification processes, and anaerobic ammonia oxidation processes in wastewater denitrification.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment experimental equipment, specifically a laboratory device for verifying the effect of pH on the wastewater denitrification process. Background Technology

[0002] Global water bodies are facing an increasingly severe challenge of nitrogen pollution. Nitrogen pollutants are a major cause of eutrophication, leading to the proliferation of algae, which depletes dissolved oxygen in water bodies, severely disrupts the balance of ecosystems, and causes water bodies to smell foul, affecting landscapes and water resource utilization. In addition, nitrogen pollutants also pose potential risks to human health. For example, high concentrations of nitrates and nitrites can cause methemoglobinemia in infants and often indicate pollution from fertilizers, septic tanks, or industrial sources. The prevalence and persistence of nitrogen pollution, as well as its profound impact on ecosystems and human health, make wastewater denitrification an urgent task.

[0003] There are many types of wastewater denitrification processes in the existing technology, such as traditional nitrification-denitrification process, short-cut nitrification-denitrification process, and anaerobic ammonia oxidation process.

[0004] All of the above-mentioned wastewater denitrification processes rely on biochemical reactions carried out by microorganisms. However, the pH of the water body will affect the activity, enzyme function and gene expression of microorganisms to varying degrees. Therefore, under different pH conditions, parameters such as the efficiency of wastewater denitrification processes, the removal rate of nitrogen pollutants, the accumulation of intermediate products and economic efficiency will be affected.

[0005] In summary, how to provide laboratory equipment to verify the impact of pH on wastewater denitrification processes, thereby providing optimal pH environment research, demonstration, and guidance for wastewater denitrification processes, has become one of the urgent problems to be solved. Utility Model Content

[0006] The purpose of this invention is to provide a laboratory device for verifying the effect of pH on wastewater denitrification processes, which can verify the effect of different pH values ​​on wastewater denitrification processes.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a laboratory device for verifying the effect of pH on a wastewater denitrification process, comprising at least a wastewater denitrification reactor, a pH adjustment mechanism, and an inlet / outlet mechanism; the wastewater denitrification reactor includes a reactor body suitable for holding nitrogen-containing experimental wastewater; a microbial carrier is contained within the reactor body of the wastewater denitrification reactor; the pH adjustment mechanism includes a pH sensor and a metering pump; the pH sensor is disposed at the reactor body of the wastewater denitrification reactor for detecting the pH within the reactor body of the wastewater denitrification reactor. The pH value of the nitrogen-containing experimental wastewater is measured and transmitted to the host computer; the output end of the metering pump is connected to the reactor body of the wastewater denitrification process reactor; the metering pump is used to pump pH adjuster into the reactor body of the wastewater denitrification process reactor under the control of the host computer to maintain the pH value of the nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor; the inlet / outlet mechanism is used to quantitatively pump nitrogen-containing experimental wastewater into the reactor body of the wastewater denitrification process reactor under the control of the host computer, and quantitatively extract nitrogen-containing experimental wastewater from the reactor body of the wastewater denitrification process reactor.

[0008] In the above technical solution, the water inlet / outlet mechanism includes an inlet peristaltic pump and an outlet peristaltic pump; the output end of the inlet peristaltic pump is connected to the reactor body of the wastewater denitrification process reactor; the input end of the outlet peristaltic pump is connected to the reactor body of the wastewater denitrification process reactor; the inlet peristaltic pump of the water inlet / outlet mechanism is used to quantitatively pump nitrogen-containing experimental wastewater into the reactor body of the wastewater denitrification process reactor under the control of the host computer; the outlet peristaltic pump of the water inlet / outlet mechanism is used to quantitatively extract nitrogen-containing experimental wastewater from the reactor body of the wastewater denitrification process reactor under the control of the host computer.

[0009] In the above technical solution, the laboratory equipment for verifying the effect of pH on the wastewater denitrification process of this utility model also includes a temperature control mechanism; the temperature control mechanism is used to maintain the temperature of the nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor at a constant value.

[0010] In the above technical solution, the temperature control mechanism includes an electric heater and a temperature sensor; the temperature sensor is configured at the reactor body of the wastewater denitrification process reactor to detect the temperature of the nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor and transmit it to the host computer; the electric heater is configured at the reactor body of the wastewater denitrification process reactor to heat the nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor under the control of the host computer, so as to maintain the temperature of the nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor at a constant value.

[0011] In the above technical solution, the laboratory equipment for verifying the effect of pH on the wastewater denitrification process of this utility model also includes an aeration mechanism; the aeration mechanism is used to inject air into the nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor.

[0012] In the above technical solution, the aeration mechanism includes an air pump and an aeration pipe; the output end of the air pump is connected to the aeration pipe; the aeration pipe is arranged in the reactor body of the wastewater denitrification process reactor; the air pump is used to inject air into the aeration pipe under the control of the host computer, thereby injecting air into the nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor through the aeration pipe.

[0013] In the above technical solution, the reactor body of the wastewater denitrification process reactor is equipped with a conical bottom.

[0014] In the above technical solution, the wastewater denitrification process reactor further includes a stirrer assembly; the stirrer assembly is used to stir the nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor.

[0015] In the above technical solution, the agitator assembly includes a motor and an agitator shaft; the motor shaft is coaxially connected with the agitator shaft; the agitator shaft extends into the reactor body of the wastewater denitrification process reactor; when the motor is running, it can drive the agitator shaft to rotate, so as to agitate the nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor.

[0016] In the above technical solution, the microbial carrier is activated sludge or a membrane bioreactor.

[0017] Compared with existing technologies, the beneficial effects of this invention are as follows: The laboratory equipment of this invention for verifying the influence of pH on wastewater denitrification processes uses a pH sensor to detect the pH value of nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor, and a metering pump to pump pH adjuster into the reactor body of the wastewater denitrification process reactor to maintain the pH value of nitrogen-containing experimental wastewater. It can deeply reveal how pH affects the activity, enzyme function, and gene expression of microorganisms in wastewater denitrification processes such as traditional nitrification-denitrification, short-cut nitrification-denitrification, and anaerobic ammonia oxidation, forming a systematic theoretical framework. This clarifies the optimal pH range and operating parameters of wastewater denitrification processes such as traditional nitrification-denitrification, short-cut nitrification-denitrification, and anaerobic ammonia oxidation under different influent water quality conditions. Finally, it proposes one or more pH control strategies for wastewater denitrification processes based on real-time monitoring and intelligent control, effectively saving the infrastructure costs and processing capacity of wastewater denitrification equipment. Attached Figure Description

[0018] Figure 1 This is a structural view of the present invention.

[0019] The attached figures are labeled as follows: 11. Reactor body; 111. Conical bottom; 121. Motor; 122. Stirring shaft; 21. Electric heater; 22. Temperature sensor; 31. Air pump; 32. Aeration pipe; 41. pH sensor; 42. Metering pump; 43. pH adjuster; 51. Inlet peristaltic pump; 52. Outlet peristaltic pump; 6. Microbial carrier. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] This embodiment provides a laboratory device for verifying the effect of pH on wastewater denitrification processes, which can verify the impact of different pH values ​​on wastewater denitrification processes.

[0022] Please see Figure 1 The laboratory equipment used in this embodiment to verify the effect of pH on the wastewater denitrification process includes at least a wastewater denitrification process reactor, a pH adjustment mechanism, and an inlet / outlet mechanism.

[0023] The wastewater denitrification process reactor includes a reactor body 11 suitable for holding nitrogen-containing experimental wastewater. The reactor body 11 is a cylindrical reaction vessel made of transparent plexiglass, with a diameter of 12cm to 15cm, a height of 50cm to 60cm, and an effective volume of 5L to 10L.

[0024] The reactor body 11 of the wastewater denitrification process reactor contains a microbial carrier 6. Specifically, the microbial carrier 6 is activated sludge or a membrane bioreactor. The microorganisms inoculated on it are microorganisms suitable for undertaking the biochemical reactions in wastewater denitrification processes such as traditional nitrification-denitrification, short-cut nitrification-denitrification, and anaerobic ammonia oxidation, such as nitrifying bacteria.

[0025] The pH adjustment mechanism includes a pH sensor 41 and a metering pump 42. The pH sensor 41 is used to detect the concentration of hydrogen ions in the analyte and convert it into a corresponding electrical signal. The metering pump 42 can be a precision electronic water pump or a precision diaphragm pump and is corrosion resistant. Its actuator is controlled by a host computer.

[0026] The pH sensor 41 is configured in the reactor body 11 of the wastewater denitrification process reactor (specifically, the probe of the pH sensor 41 is inserted into the reactor body 11 of the wastewater denitrification process reactor) to detect the pH value of the nitrogen-containing experimental wastewater in the reactor body 11 of the wastewater denitrification process reactor and transmit it to the host computer.

[0027] The output end of metering pump 42 is connected to the reactor body 11 of the wastewater denitrification process reactor, specifically through a water pipe.

[0028] The metering pump 42 is used to pump the pH adjuster 43 into the reactor body 11 of the wastewater denitrification process reactor under the control of the host computer, so as to maintain the pH value of the nitrogen-containing experimental wastewater in the reactor body 11 of the wastewater denitrification process reactor; wherein, the pH adjuster 43 can be derived from the storage tank or other container, and the pH adjuster 43 is specifically a commonly used pH adjuster 43 such as hydrochloric acid, sulfuric acid, sodium hydroxide solvent.

[0029] The inlet / outlet mechanism is used to quantitatively pump nitrogen-containing experimental wastewater into the reactor body 11 of the wastewater denitrification process reactor under the control of the host computer, and to quantitatively extract nitrogen-containing experimental wastewater from the reactor body 11 of the wastewater denitrification process reactor.

[0030] Specifically, the inlet / outlet mechanism includes an inlet peristaltic pump 51 and an outlet peristaltic pump 52, both of which are corrosion-resistant. The output end of the inlet peristaltic pump 51 is connected to the reactor body 11 of the wastewater denitrification process reactor, specifically through a water pipe. The input end of the outlet peristaltic pump 52 is connected to the reactor body 11 of the wastewater denitrification process reactor, specifically through a water pipe. The inlet peristaltic pump 51 of the inlet / outlet mechanism is used to quantitatively pump nitrogen-containing experimental wastewater into the reactor body 11 of the wastewater denitrification process reactor under the control of the host computer. The outlet peristaltic pump 52 of the inlet / outlet mechanism is used to quantitatively extract nitrogen-containing experimental wastewater from the reactor body 11 of the wastewater denitrification process reactor under the control of the host computer.

[0031] The inlet / outlet mechanism, consisting of inlet peristaltic pump 51 and outlet peristaltic pump 52, enables quantitative inlet and outlet of water in the reactor body 11 of the wastewater denitrification process reactor, thereby achieving precise simulation and control of hydraulic retention time (HRT).

[0032] Furthermore, the laboratory equipment for verifying the effect of pH on the wastewater denitrification process in this embodiment also includes a temperature control mechanism; the temperature control mechanism is used to maintain the temperature of the nitrogen-containing experimental wastewater in the reactor body 11 of the wastewater denitrification process reactor at a constant value.

[0033] Specifically, the temperature control mechanism includes an electric heater 21 and a temperature sensor 22. The electric heater 21 is a small, low-power liquid heater, and the temperature sensor 22 is a liquid temperature sensor. The temperature sensor 22 is configured at the reactor body 11 of the wastewater denitrification process reactor (specifically, the probe of the temperature sensor 22 is inserted into the reactor body 11 of the wastewater denitrification process reactor) to detect the temperature of the nitrogen-containing experimental wastewater in the reactor body 11 of the wastewater denitrification process reactor and transmit it to the host computer. The electric heater 21 is configured at the reactor body 11 of the wastewater denitrification process reactor (specifically, the heating part of the electric heater 21 is inserted into the reactor body 11 of the wastewater denitrification process reactor) to heat the nitrogen-containing experimental wastewater in the reactor body 11 of the wastewater denitrification process reactor under the control of the host computer, so as to maintain the temperature of the nitrogen-containing experimental wastewater in the reactor body 11 of the wastewater denitrification process reactor at a constant value.

[0034] A temperature control mechanism is configured to maintain the temperature of the nitrogen-containing experimental wastewater in the reactor body 11 of the wastewater denitrification process reactor at a constant value, which can effectively avoid the influence of temperature variables on the experiment.

[0035] Furthermore, the laboratory equipment for verifying the effect of pH on the wastewater denitrification process in this embodiment also includes an aeration mechanism; the aeration mechanism is used to inject air into the nitrogen-containing experimental wastewater in the reactor body 11 of the wastewater denitrification process reactor.

[0036] Specifically, the aeration mechanism includes an air pump 31 and an aeration pipe 32. The air pump 31 is a small, low-power air pump, such as an impeller-type air pump, and the aeration pipe 32 is a gas pipe with several aeration holes or aeration manifolds. The output end of the air pump 31 is connected to the aeration pipe 32. The aeration pipe 32 is installed in the reactor body 11 of the wastewater denitrification process reactor. The air pump 31 is used to inject air into the aeration pipe 32 under the control of the host computer, thereby injecting air into the nitrogen-containing experimental wastewater in the reactor body 11 of the wastewater denitrification process reactor through the aeration pipe 32.

[0037] An aeration mechanism is configured to inject air into the nitrogen-containing experimental wastewater in the reactor body 11 of the wastewater denitrification process reactor, thereby ensuring the survival of microorganisms and the normal progress of biochemical reactions.

[0038] Furthermore, the reactor body 11 of the wastewater denitrification process reactor is equipped with a conical bottom 111 so that the microbial carrier 6 can accumulate and remain at the bottom of the reactor body 11.

[0039] Furthermore, the wastewater denitrification process reactor also includes a stirrer assembly; the stirrer assembly is used to stir the nitrogen-containing experimental wastewater in the reactor body 11 of the wastewater denitrification process reactor.

[0040] Specifically, the agitator assembly includes a motor 121 and an agitator shaft 122. The motor 121 is a small, low-power electric motor, such as a small brushless DC motor, and the agitator shaft 122 is a metal shaft with several agitator blades and is corrosion-resistant. The shaft of the motor 121 and the agitator shaft 122 are coaxially connected, which can be achieved through a coupling. The agitator shaft 122 extends into the reactor body 11 of the wastewater denitrification process reactor. When the motor 121 is running, it can drive the agitator shaft 122 to rotate, thereby agitating the nitrogen-containing experimental wastewater in the reactor body 11 of the wastewater denitrification process reactor. It can be understood that the motor 121 can be controlled by a host computer or can operate independently.

[0041] Configure a stirrer assembly to thoroughly mix the microbial carrier 6 and the nitrogen-containing experimental wastewater.

[0042] It is understood that the laboratory equipment used in this embodiment to verify the effect of pH on the wastewater denitrification process includes a host computer, which is one of an industrial control computer, a programmable logic controller (PLC), or an industrial control circuit board based on an embedded chip. It has at least a general-purpose input / output interface, an analog input interface, an analog output interface, and a PWM output interface. The motor 121 of the stirrer assembly can be connected to the general-purpose input / output interface of the host computer or operate independently. The electric heater 21 of the temperature control mechanism can have its signal input terminal connected to either the general-purpose input / output interface of the host computer to control the operation of the electric heater 21 via level control, or it can be connected to the analog output interface or PWM output interface of the host computer. The operating power of the electric heater 21 is controlled by voltage control or PWM control. The temperature sensor 22 of the temperature control mechanism is connected to the analog input interface of the host computer. The air pump 31 of the aeration mechanism is connected to the general input / output interface of the host computer to control the operation of the air pump 31 by level control. The pH sensor 41 of the pH adjustment mechanism is connected to the analog input interface of the host computer. The signal input terminals of the metering pump 42 of the pH adjustment mechanism, the inlet peristaltic pump 51 and the outlet peristaltic pump 52 of the inlet / outlet water mechanism are respectively connected to the PWM output interface of the host computer to control the operating conditions of the metering pump 42, the inlet peristaltic pump 51 and the outlet peristaltic pump 52 by PWM control.

[0043] The laboratory equipment used in this embodiment to verify the effect of pH on the wastewater denitrification process requires the pre-configuration of nitrogen-containing experimental wastewater. The composition of the nitrogen-containing wastewater (e.g., ammonia nitrogen, nitrate nitrogen, and carbon sources such as acetate and glucose) can be adjusted according to its actual characteristics. Subsequently, multiple pH gradients are set, and the laboratory equipment is run under each pH condition. The specific method is as follows:

[0044] When operating the laboratory equipment used in this embodiment to verify the effect of pH on the wastewater denitrification process, at certain time intervals (e.g., every 10 min, every 0.5 h, etc.), samples of nitrogen-containing experimental wastewater in the reactor body 11 of the wastewater denitrification process reactor are taken, and / or the effluent from the peristaltic pump 52 is used. The nitrogen-containing experimental wastewater is analyzed for water quality indicators (NH4+-N, NO2--N, NO3--N, TN, COD, SS, alkalinity, etc. in the nitrogen-containing experimental wastewater are determined using national standard methods and industry standard methods), gas analysis (N2O emission is determined using gas chromatography), microbial analysis (DNA extraction, high-throughput sequencing analysis of microbial community structure, qPCR quantification of key functional gene abundance, FAME analysis or FISH technology to identify dominant strains), and enzyme activity determination (the activity of key enzymes such as nitrate reductase and nitrite reductase is determined).

[0045] Based on the data measured above, statistical software can be used to perform statistical processing such as significance analysis, regression analysis, and response surface methodology (RSM) optimization. Alternatively, the data measured above can be used to construct a kinetic model of the effect of pH on the wastewater denitrification process, which can be used to predict and optimize the operating parameters of the wastewater denitrification process.

[0046] The laboratory equipment used in this embodiment to verify the impact of pH on wastewater denitrification processes includes a pH sensor 41 for detecting the pH value of nitrogen-containing experimental wastewater in the reactor body 11 of the wastewater denitrification reactor, and a metering pump 42 for pumping pH adjuster 43 into the reactor body 11 to maintain the pH value of the nitrogen-containing experimental wastewater. This equipment can deeply reveal how pH affects the activity, enzyme function, and gene expression of microorganisms in wastewater denitrification processes such as traditional nitrification-denitrification, short-cut nitrification-denitrification, and anaerobic ammonia oxidation, forming a systematic theoretical framework. This clarifies the optimal pH range and operating parameters for wastewater denitrification processes such as traditional nitrification-denitrification, short-cut nitrification-denitrification, and anaerobic ammonia oxidation under different influent water quality conditions. Finally, it proposes one or more pH control strategies for wastewater denitrification processes based on real-time monitoring and intelligent control, effectively saving on the infrastructure costs and processing capacity of wastewater denitrification equipment.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A laboratory apparatus for verifying the effect of pH on a wastewater denitrification process, characterized by, It includes at least a wastewater denitrification process reactor, a pH adjustment mechanism, and an influent / effluent mechanism; The wastewater denitrification process reactor includes a reactor body suitable for holding nitrogen-containing experimental wastewater; The reactor body of the wastewater denitrification process reactor contains a microbial carrier. The pH adjustment mechanism includes a pH sensor and a metering pump; The pH sensor is configured at the reactor body of the wastewater denitrification process reactor to detect the pH value of the nitrogen-containing experimental wastewater in the reactor body and transmit it to the host computer. The output end of the metering pump is connected to the reactor body of the wastewater denitrification process reactor; The metering pump is used to pump pH adjuster into the reactor body of the wastewater denitrification process reactor under the control of the host computer, so as to maintain the pH value of the nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor. The inlet / outlet mechanism is used to pump nitrogen-containing experimental wastewater quantitatively into the reactor body of the wastewater denitrification process reactor under the control of the host computer, and to extract nitrogen-containing experimental wastewater quantitatively from the reactor body of the wastewater denitrification process reactor.

2. The laboratory apparatus for verifying the effect of pH on wastewater denitrification processes according to claim 1, characterized in that, The water inlet / outlet mechanism includes an inlet peristaltic pump and an outlet peristaltic pump; The output end of the inlet peristaltic pump is connected to the reactor body of the wastewater denitrification process reactor; The input end of the effluent peristaltic pump is connected to the reactor body of the wastewater denitrification process reactor; The water inlet / outlet mechanism's peristaltic pump is used to quantitatively pump nitrogen-containing experimental wastewater into the reactor body of the wastewater denitrification process reactor under the control of the host computer. The peristaltic pump of the inlet / outlet mechanism is used to quantitatively extract nitrogen-containing experimental wastewater from the reactor body of the wastewater denitrification process reactor under the control of the host computer.

3. The laboratory apparatus for verifying the effect of pH on wastewater denitrification processes according to claim 1, characterized in that, It also includes a temperature control mechanism; The temperature control mechanism is used to maintain the temperature of the nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor at a constant value.

4. The laboratory apparatus for verifying the effect of pH on wastewater denitrification processes according to claim 3, characterized in that, The temperature control mechanism includes an electric heater and a temperature sensor; The temperature sensor is configured at the reactor body of the wastewater denitrification process reactor to detect the temperature of the nitrogen-containing experimental wastewater in the reactor body and transmit it to the host computer. The electric heater is configured at the reactor body of the wastewater denitrification process reactor to heat the nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor under the control of the host computer, so as to maintain the temperature of the nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor at a constant value.

5. The laboratory apparatus for verifying the effect of pH on wastewater denitrification processes according to claim 1, characterized in that, It also includes aeration mechanisms; The aeration mechanism is used to inject air into the nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor.

6. The laboratory apparatus for verifying the effect of pH on wastewater denitrification processes according to claim 5, characterized in that, The aeration mechanism includes an air pump and aeration pipes; The output end of the air pump is connected to the aeration pipe; The aeration pipes are installed inside the reactor body of the wastewater denitrification process reactor. The air pump is used to inject air into the aeration pipe under the control of the host computer, thereby injecting air into the nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor through the aeration pipe.

7. The laboratory apparatus for verifying the effect of pH on wastewater denitrification processes according to claim 1, characterized in that, The reactor body of the wastewater denitrification process reactor is equipped with a conical bottom.

8. The laboratory device for verifying the influence of pH on the process of denitrification of wastewater according to claim 1 or 7, characterized in that, The wastewater denitrification process reactor also includes a stirrer assembly; The agitator assembly is used to agitate the nitrogen-containing experimental wastewater within the reactor body of the wastewater denitrification process reactor.

9. The laboratory apparatus for verifying the effect of pH on wastewater denitrification processes according to claim 8, characterized in that, The agitator assembly includes a motor and an agitator shaft; The motor shaft is coaxially connected with the stirring shaft; The stirring shaft extends into the reactor body of the wastewater denitrification process reactor. When the motor is running, it can drive the stirring shaft to rotate, thereby stirring the nitrogen-containing experimental wastewater in the reactor body of the wastewater denitrification process reactor.

10. The laboratory apparatus for verifying the effect of pH on wastewater denitrification processes according to claim 1, characterized in that, The microbial carrier is activated sludge or a membrane bioreactor.

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