Organic sewage biological denitrification treatment device and method

Abstract

The invention discloses an organic sewage biological denitrification treatment device and method, and relates to the technical field of sewage treatment.The organic sewage biological denitrification treatment device comprises an outer shell, an inner shell, a top plate, a heating temperature control device, a stirring device, an aeration device, a monitoring device, a gas pressure balancing device, a pH monitoring and adjusting device and a controller; the heating temperature control device is used for heating and controlling the temperature of a water body between the outer shell and the inner shell, and the inner shell is provided with a device water inlet and a device water outlet; the pH monitoring and adjusting device comprises a pH monitoring part and an acid-base adding device, the stirring device, the aeration device, the monitoring device and the pH monitoring part are arranged on the top plate and extend into the inner shell, the monitoring device is used for monitoring the dissolved oxygen concentration of a water body in the inner shell, and the gas pressure balancing device and the acid-base adding device are arranged on the top plate and communicate with the inner shell. According to the device and the method, a plurality of water quality parameters can be accurately controlled, and the microbial denitrification efficiency and the system stability are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly to an organic sewage biological denitrification treatment device and method. Background Art

[0002] In modern economic and social development, sewage treatment has become an important link in environmental protection and sustainable utilization of resources. With the rapid advancement of industrialization and urbanization, the problem of nitrogen pollution in organic sewage has become increasingly severe. Excessive emissions of nitrogen pollutants (such as ammonia nitrogen and nitrate nitrogen) can cause water eutrophication, leading to a series of environmental problems such as excessive growth of algae in water bodies, a decrease in dissolved oxygen concentration, and the collapse of aquatic ecosystems.

[0003] Currently, sewage nitrogen treatment technologies mainly include physical, chemical, and biological denitrification technologies. Physical methods include reverse osmosis, adsorption, membrane separation, etc. These technologies have a high removal efficiency for nitrogen, but usually have problems such as high energy consumption and expensive operating costs. Chemical methods mainly involve chemical precipitation and redox reactions. Although these methods are simple to operate and quick to take effect, they may introduce secondary pollution and have limited comprehensive treatment capabilities for sewage. In contrast, biological denitrification technology has become the most widely used means for removing nitrogen from sewage due to its high efficiency, economy, and environmental friendliness. The main principle of biological denitrification technology is to convert nitrogen into nitrogen gas so that it escapes from the system.

[0004] In recent years, intelligent water quality parameter control technology has gradually become a research hotspot in the field of sewage biological denitrification treatment. However, there is still room for improvement in existing precise control technologies. On the one hand, the functional integration degree of intelligent devices is insufficient, making it difficult to meet the requirements of complex sewage treatment scenarios; on the other hand, most of the current sewage treatment devices on the market only regulate single parameters, lacking technical means based on multi-parameter collaborative optimization, and failing to fully exploit the potential of microorganisms to cope with complex pollutant types and high-concentration loads, resulting in the need to improve the treatment efficiency and stability. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides an organic sewage biological denitrification treatment device and method, which can achieve precise control of multiple water quality parameters, significantly improving the microbial denitrification efficiency and system stability.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides an organic sewage biological denitrification treatment device, which includes an outer casing, an inner casing, a top plate, a heating and temperature control device, a stirring device, an aeration device, a monitoring device, a gas pressure balance device, a pH monitoring and adjusting device, and a controller. The bottoms of the outer casing and the inner casing are both closed structures. The top plate is detachably installed on the top of the outer casing. The inner casing is arranged in the outer casing and its top is detachably installed on the top plate. A circulating water bath water inlet and a circulating water bath water outlet are arranged on the outer casing. The heating and temperature control device is used to heat and control the temperature of the water body between the outer casing and the inner casing. A device water inlet and a device water outlet are arranged on the inner casing. A first water inlet component is connected to the device water inlet, and the first water inlet component passes through the outer casing and extends to the outside. A first water outlet component is connected to the device water outlet, and the first water outlet component passes through the outer casing and extends to the outside. The pH monitoring and adjusting device includes a pH monitoring component and an acid-base adding device. The stirring device, the aeration device, the monitoring device, and the pH monitoring component are all arranged on the top plate and extend into the inner casing. The monitoring device is used to monitor the dissolved oxygen concentration of the water body in the inner casing. The gas pressure balance device and the acid-base adding device are both arranged on the top plate and are both communicated with the inner casing. The stirring device, the aeration device, the monitoring device, the pH monitoring component, and the acid-base adding device are all connected to the controller.

[0008] Preferably, the heating and temperature control device includes a heating rod, a temperature sensor, and a temperature controller. The heating rod and the temperature sensor are both arranged on the top plate and extend into the space between the outer casing and the inner casing. The heating rod and the temperature sensor are both connected to the temperature controller.

[0009] Preferably, the circulating water bath water inlet is connected to a second water inlet component, and the circulating water bath water outlet is connected to a second water outlet component.

[0010] Preferably, the circulating water bath water inlet is arranged at the lower part of one side of the outer casing, and the circulating water bath water outlet is arranged at the upper part of the other side of the outer casing. The device water inlet is arranged at the lower part of one side of the inner casing, and the device water outlet is arranged at the upper part of the other side of the inner casing.

[0011] Preferably, the stirring device includes a motor, a stirring shaft, and a plurality of stirring blades. The motor is arranged on the top plate. The power output shaft of the motor extends into the inner casing and is connected to the upper end of the stirring shaft. A plurality of the stirring blades are all arranged on the stirring shaft. The motor is connected to the controller.

[0012] Preferably, the aeration device includes a first gas cylinder, a first inlet pipe, a first inlet regulating valve, a second gas cylinder, a second inlet pipe, a second inlet regulating valve, and an aeration pipe. The aeration pipe is arranged on the top plate and extends into the inner housing. The upper end of the aeration pipe is connected to the first inlet pipe and the second inlet pipe. One end of the first inlet pipe away from the aeration pipe is connected to the first gas cylinder. The first gas cylinder contains a first gas, which is nitrogen or a mixture of nitrogen and carbon dioxide. The first inlet regulating valve is arranged on the first inlet pipe. One end of the second inlet pipe away from the aeration pipe is connected to the second gas cylinder. The second gas cylinder contains a second gas, which is air or oxygen. The second inlet regulating valve is arranged on the second inlet pipe. Both the first inlet regulating valve and the second inlet regulating valve are connected to the controller.

[0013] Preferably, the monitoring device includes a dissolved oxygen concentration sensor, which is arranged on the top plate and extends into the inner housing, and is connected to the controller.

[0014] Preferably, the monitoring device further includes a conductivity sensor and a redox potential sensor. Both the conductivity sensor and the redox potential sensor are arranged on the top plate and extend into the inner housing, and are both connected to the controller.

[0015] The present invention also provides an organic sewage biological denitrification treatment method based on the organic sewage biological denitrification treatment device, including the following steps:

[0016] Step 1: Put activated sludge into the inner housing, fix the top plate on the top of the inner housing, place the inner housing into the outer housing, and fix the top plate on the top of the outer housing. Pass circulating water between the outer housing and the inner housing through the circulating water bath water inlet, and keep the water body between the outer housing and the inner housing at a certain temperature through the heating and temperature control device.

[0017] Step 2: Introduce sewage into the inner housing through the first water inlet component and the device water inlet. Start the stirring device and the aeration device through the controller. The monitoring device transmits the measured value of the dissolved oxygen concentration of the water body in the inner housing to the controller. The controller adjusts the aeration device according to the set value of the dissolved oxygen concentration. The pH monitoring component transmits the measured value of the pH of the water body in the inner housing to the controller. The controller controls the acid-base adding device to add a phosphate buffer solution or a carbonate buffer solution to the water body in the inner housing according to the pH set value.

[0018] Step 3: Discharge the treated water body through the water outlet of the device and the first water outlet component, and collect samples from the treated water body for analysis of nitrogen conversion efficiency.

[0019] Preferably, in Step 1, the temperature of the water body between the outer housing and the inner housing is 20°C to 40°C; in Step 2, the dissolved oxygen concentration of the water body in the inner housing is 0.2 mg / L to 1.5 mg / L, and the set pH value of the water body in the inner housing is 6.5 - 8.5.

[0020] The present invention has achieved the following technical effects compared with the prior art:

[0021] The organic sewage biological denitrification treatment device of the present invention includes an outer housing, an inner housing, a top plate, a heating and temperature control device, a stirring device, an aeration device, a monitoring device, a gas pressure balance device, a pH monitoring and adjustment device, and a controller. The heating and temperature control device can precisely control the temperature of the water body between the outer housing and the inner housing. The cooperation of the monitoring device and the aeration device can precisely control the dissolved oxygen concentration, and the aeration device can adjust the gas composition. The cooperation of the pH monitoring component and the acid-base adding device can precisely control the pH value. That is, in the present invention, precise control of temperature, dissolved oxygen concentration, pH value, and gas composition can be achieved, and combined with the real-time monitoring and feedback adjustment mechanism, the microbial denitrification efficiency and system stability are significantly improved. The device and method of the present invention can not only solve the bottleneck problems of traditional biological methods in parameter regulation and system stability, but also provide a new way for the efficient treatment of complex sewage while meeting the requirements of green and low consumption. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of the organic sewage biological denitrification treatment device provided by the present invention;

[0024] Figure 2 It is a graph showing the change in the total inorganic nitrogen content in the artificially prepared sewage during the 100-day repair cycle of Example 1 and Comparative Examples 1 - 3 using the organic sewage biological denitrification treatment device provided by the present invention;

[0025] Figure 3 It is a graph showing the change in the total inorganic nitrogen content in the actual domestic sewage during the 100-day repair cycle of Example 1 and Comparative Examples 1 - 3 using the organic sewage biological denitrification treatment device provided by the present invention.

[0026] Description of reference numerals: 1. Outer housing; 2. Inner housing; 3. Top plate; 4. First water inlet pipe; 5. First water outlet pipe; 6. Second water inlet pipe; 7. Second water outlet pipe; 8. Stirring shaft; 9. Stirring blade; 10. Monitoring device; 11. Aeration pipe; 12. Gas pressure balancing device; 13. pH monitoring component; 14. Acid-base adding device; 15. Heating rod. Specific embodiments

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] The object of the present invention is to provide an organic sewage biological denitrification treatment device and method, which can achieve precise control of multiple water quality parameters, and significantly improve the microbial denitrification efficiency and system stability.

[0029] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] As Figure 1As shown in the figure, this embodiment provides an organic sewage biological denitrification treatment device, including an outer casing 1, an inner casing 2, a top plate 3, a heating and temperature control device, a stirring device, an aeration device, a monitoring device 10, a gas pressure balance device 12, a pH monitoring and adjustment device, and a controller. The bottoms of both the outer casing 1 and the inner casing 2 are closed structures, and the tops of both the outer casing 1 and the inner casing 2 are open structures. The top plate 3 is detachably installed on the top of the outer casing 1. The inner casing 2 is arranged in the outer casing 1 and its top is detachably installed on the top plate 3. A circulating water bath water inlet and a circulating water bath water outlet are provided on the outer casing 1. The heating and temperature control device is used to heat and control the temperature of the water body between the outer casing 1 and the inner casing 2. A device water inlet and a device water outlet are provided on the inner casing 2. A first water inlet component is connected to the device water inlet, and the first water inlet component passes through the outer casing 1 and extends to the outside. A first water outlet component is connected to the device water outlet, and the first water outlet component passes through the outer casing 1 and extends to the outside. The pH monitoring and adjustment device includes a pH monitoring component 13 and an acid-base adder 14. The stirring device, the aeration device, the monitoring device 10, and the pH monitoring component 13 are all arranged on the top plate 3 and extend into the inner casing 2. The monitoring device 10 is used to monitor the dissolved oxygen concentration of the water body in the inner casing 2. The gas pressure balance device 12 and the acid-base adder 14 are both arranged on the top plate 3 and are both communicated with the inner casing 2. The stirring device, the aeration device, the monitoring device 10, the pH monitoring component 13, and the acid-base adder 14 are all connected to the controller.

[0031] In this embodiment, the heating and temperature control device is used to precisely control the temperature of the water body between the outer casing 1 and the inner casing 2, providing an optimal metabolic environment for the biological denitrification bacteria group. The precise control of the dissolved oxygen concentration can be achieved through the cooperation of the monitoring device 10 and the aeration device, ensuring the efficient connection of the denitrification and aerobic denitrification processes. Moreover, the aeration device can adjust the gas composition, and the gas pressure balance device 12 can control the gas pressure balance of the water body. By intelligently adjusting the gas composition and pressure balance in the water body, the efficient interaction between the gas phase and the liquid phase is realized, maximizing the nitrogen cycle efficiency. The precise control of the pH value can be achieved through the cooperation of the pH monitoring component 13 and the acid-base adder 14 to promote the synergistic effect of ammonia nitrogen oxidation and denitrifying bacteria. The water body environment is evenly regulated through the stirring device to avoid local differences and optimize the reaction conditions. That is, in this embodiment, the precise control of temperature, dissolved oxygen concentration, pH value, and gas composition can be achieved, and combined with the real-time monitoring and feedback adjustment mechanism, the microbial denitrification efficiency and system stability are significantly improved. The device and method of this embodiment can not only solve the bottleneck problems of traditional biological methods in parameter regulation and system stability, but also provide a new way for the efficient treatment of complex sewage while meeting the requirements of green and low consumption.

[0032] Specifically, the heating and temperature control device includes a heating rod 15, a temperature sensor and a temperature controller. The heating rod 15 and the temperature sensor are both arranged on the top plate 3 and extend between the outer housing 1 and the inner housing 2. The heating rod 15 and the temperature sensor are both connected to the temperature controller. The heating rod 15 in this embodiment has a stainless steel housing. The heating and temperature control device has a temperature control accuracy within ±0.1 °C and can be applied to different processing requirements.

[0033] In this embodiment, the circulating water bath water inlet is connected to the outlet of the water tank through the first pipeline, and a circulating pump is arranged on the first pipeline. The circulating water bath water outlet is connected to the inlet of the water tank through the second pipeline.

[0034] During operation, the circulating pump transports the water in the water tank through the first pipeline and the circulating water bath water inlet to the outer housing 1, and the circulating water can flow back to the water tank through the circulating water bath water outlet and the second pipeline. The temperature is set in the temperature controller. The temperature sensor transmits the measured temperature of the water body between the outer housing 1 and the inner housing 2 to the temperature controller, and the temperature controller controls and adjusts the heating rod 15 according to the temperature set value.

[0035] In this embodiment, the circulating water bath water inlet is connected with a second water inlet component, and the circulating water bath water outlet is connected with a second water outlet component.

[0036] In this specific embodiment, the first water inlet component is the first water inlet pipe 4, the first water outlet component is the first water outlet pipe 5, the second water inlet component is the second water inlet pipe 6, and the second water outlet component is the second water outlet pipe 7. Specifically, both the first water inlet pipe 4 and the first water outlet pipe 5 are flexible hoses.

[0037] In order to make the circulating water stay in the outer housing 1 sufficiently, the circulating water bath water inlet is arranged at the lower part of one side of the outer housing 1, and the circulating water bath water outlet is arranged at the upper part of the other side of the outer housing 1.

[0038] In order to make the sewage stay in the inner housing 2 sufficiently to achieve the denitrification reaction, the device water inlet is arranged at the lower part of one side of the inner housing 2, and the device water outlet is arranged at the upper part of the other side of the inner housing 2.

[0039] The pH monitoring component 13 in this embodiment is a pH monitor. The controller can control the acid-base adder 14 to add phosphate buffer solution or carbonate buffer solution into the inner housing 2. The amount of acid-base added is automatically calculated according to the pH value deviation, and the addition accuracy is ±0.1%. The response time of the pH monitoring and adjusting device is less than 30 seconds.

[0040] The stirring device includes a motor, a stirring shaft 8 and a plurality of stirring blades 9. The motor is arranged on the top plate 3. The power output shaft of the motor extends into the inner housing 2 and is connected to the upper end of the stirring shaft 8. A plurality of stirring blades 9 are all arranged on the stirring shaft 8. The motor is connected to the controller.

[0041] During operation, the controller activates the motor, causing the stirring shaft 8 and the stirring blades 9 on the stirring shaft 8 to rotate, thereby fully stirring the sewage.

[0042] The motor in this embodiment is a DC servo motor. To adapt to different sewage treatment requirements, the rotational speed is dynamically adjusted according to the nature of the sewage to avoid excessive disturbance or parameter stratification. The adjustable speed range is 50 rpm to 150 rpm, and more preferably 75 rpm.

[0043] The aeration device includes a first gas cylinder, a first air inlet pipe, a first air inlet regulating valve, a second gas cylinder, a second air inlet pipe, a second air inlet regulating valve, and an aeration pipe 11. The aeration pipe 11 is disposed on the top plate 3 and extends into the inner housing 2. The upper end of the aeration pipe 11 is connected to the first air inlet pipe and the second air inlet pipe. One end of the first air inlet pipe remote from the aeration pipe 11 is connected to the first gas cylinder, and the first gas cylinder contains a first gas, which is nitrogen or a mixture of nitrogen and carbon dioxide. A first air inlet regulating valve is provided on the first air inlet pipe; one end of the second air inlet pipe remote from the aeration pipe 11 is connected to the second gas cylinder, and the second gas cylinder contains a second gas, which is air or oxygen. A second air inlet regulating valve is provided on the second air inlet pipe. Both the first air inlet regulating valve and the second air inlet regulating valve are connected to the controller.

[0044] The monitoring device 10 includes a dissolved oxygen concentration sensor. The dissolved oxygen concentration sensor is disposed on the top plate 3 and extends into the inner housing 2, and is connected to the controller.

[0045] During operation, both the first gas cylinder and the second gas cylinder are in the open state, and both the first air inlet regulating valve and the second air inlet regulating valve are in the closed state. The dissolved oxygen concentration sensor transmits the measured dissolved oxygen concentration of the water body in the inner housing 2 to the controller. The controller compares this measured value with the set value of the dissolved oxygen concentration. If the measured value is higher than the set value, the controller controls the first air inlet regulating valve to open and controls the opening degree of the first air inlet regulating valve to adjust the aeration volume, so that the first gas enters the aeration pipe 11 through the first air inlet pipe to reduce the dissolved oxygen concentration of the water body in the inner housing 2; if the measured value is lower than the set value, the controller controls the second air inlet regulating valve to open and controls the opening degree of the second air inlet regulating valve to adjust the aeration volume, so that the second gas enters the aeration pipe 11 through the second air inlet pipe to increase the dissolved oxygen concentration of the water body in the inner housing 2. The aeration volume in this embodiment is 0.2 m 3 / h to 0.5 m 3 / h, and more preferably 0.3 m 3 / h.

[0046] In this specific embodiment, two aeration pipes 11 are provided, and the upper ends of each aeration pipe 11 are connected to the first air inlet pipe and the second air inlet pipe. The aeration pipe 11 is a microporous aeration pipe, which can achieve a bubble diameter of 0.5 mm to 2 mm, with a large gas-liquid contact area and high gas transfer efficiency.

[0047] The monitoring device 10 further includes a conductivity sensor and a redox potential sensor. The conductivity sensor and the redox potential sensor are both arranged on the top plate 3 and extend into the inner housing 2, and both the conductivity sensor and the redox potential sensor are connected to the controller.

[0048] The monitoring device 10 integrates the functions of monitoring dissolved oxygen concentration, conductivity, and redox potential, and transmits the data to the controller in real time, with a data error of less than ±0.5%.

[0049] The gas pressure balance device 12 in this embodiment is made of corrosion-resistant materials and has an automatic pressure relief function to ensure the safe and stable operation of the system.

[0050] In this specific embodiment, the top of the outer housing 1 can be connected to the top plate 3 through a plurality of first bolts, and the top of the inner housing 2 can be connected to the top plate 3 through a plurality of second bolts, which is convenient for disassembly, cleaning, and maintenance.

[0051] In this specific embodiment, both the outer housing 1 and the inner housing 2 are cylinders with a closed bottom and an open top. The materials of the outer housing 1, the inner housing 2, and the top plate 3 are polymethyl methacrylate, which has the characteristics of strong toughness, low price, and easy machining.

[0052] This embodiment also provides an organic sewage biological denitrification treatment method based on the organic sewage biological denitrification treatment device, including the following steps:

[0053] Step 1: Put activated sludge into the inner housing 2, fix the top plate 3 on the top of the inner housing 2, put the inner housing 2 into the outer housing 1, and fix the top plate 3 on the top of the outer housing 1. Pass circulating water between the outer housing 1 and the inner housing 2 through the circulating water bath water inlet, and keep the water body between the outer housing 1 and the inner housing 2 at a certain temperature through the heating and temperature control device.

[0054] Step 2: Introduce the sewage into the inner housing 2 through the first water inlet component and the device water inlet. Start the stirring device and the aeration device through the controller. The monitoring device 10 transmits the measured value of the dissolved oxygen concentration of the water body in the inner housing 2 to the controller, and the controller adjusts the aeration device according to the set value of the dissolved oxygen concentration. The pH monitoring component 13 transmits the measured value of the pH of the water body in the inner housing 2 to the controller, and the controller controls the acid-base adder 14 to add phosphate buffer solution or carbonate buffer solution to the water body in the inner housing 2 according to the pH set value.

[0055] Specifically, at the initial stage of the device operation, artificially prepared water is introduced into the inner housing 2. After the device operates stably, sewage is introduced into the inner housing 2.

[0056] Step 3: Drain the treated water body through the device water outlet and the first water outlet component, and collect samples from the treated water body for nitrogen conversion efficiency analysis.

[0057] Specifically, in Step 1, the temperature of the water body between the outer housing 1 and the inner housing 2 is 20°C to 40°C; in Step 2, the dissolved oxygen concentration of the water body in the inner housing 2 is 0.2 mg / L to 1.5 mg / L, and the set pH value of the water body in the inner housing 2 is 6.5 - 8.5.

[0058] More preferably, the temperature of the water body between the outer housing 1 and the inner housing 2 is 25°C; in Step 2, the dissolved oxygen concentration of the water body in the inner housing 2 is 0.3 mg / L, and the set pH value of the water body in the inner housing 2 is 7.5.

[0059] The present invention integrates functional modules such as a heating and temperature control device, a pH monitoring and adjustment device, an aeration device, a monitoring device 10, and a gas pressure balance device 12, etc., comprehensively optimizes water quality parameters, ensures that microorganisms can efficiently carry out denitrification reactions in the most suitable environment, avoids fluctuations in treatment effects caused by inaccurate parameter control in traditional sewage treatment devices, and reduces chemical reagent and energy consumption. Secondly, through the modular design, each component of the device can be flexibly combined, disassembled, and maintained, facilitating on-site installation and long-term use, and improving the operability and sustainability of the device. In addition, through the coordinated regulation of multiple water quality parameters, the biological denitrification process is optimized, the dependence on single parameter control is reduced, the limitations of single parameter regulation in traditional technologies are solved, the comprehensive effect of sewage treatment is improved, and the system can also provide real-time feedback to adjust key parameters in the sewage treatment process, minimizing the need for human intervention to the greatest extent, and ensuring that the system can always maintain a stable treatment effect under different sewage treatment conditions.

[0060] The advantages of the device and method in this embodiment are as follows: low-carbon and safe, green and efficient. By precisely controlling key parameters such as temperature, pH value, and dissolved oxygen concentration, the metabolic environment of microorganisms is optimized, and the denitrification efficiency is improved. At the same time, through the real-time monitoring and feedback regulation mechanism, the system can dynamically respond to changes in sewage water quality, effectively cope with sudden load fluctuations, significantly reduce the energy consumption and the use of chemical additives in traditional biological denitrification processes, ensure the long-term stable operation of the system, provide a new solution for the intelligent, precise, and green and efficient sewage treatment technology, and have a broad application prospect.

[0061] Place the constructed and debugged organic sewage biological denitrification treatment device in this embodiment in the environment of a simulated sewage treatment plant, and inoculate 5000 mg / L of activated sludge into the device. This sludge is taken from a municipal sewage treatment plant. The influent water during the start-up period of the organic sewage biological denitrification treatment device is artificial water distribution, with the nitrate and ammonia nitrogen concentrations being 30 mgN / L respectively, and the total inorganic nitrogen concentration being 60 mgN / L. After successful start-up, the influent water is treated respectively as actual domestic sewage with a total inorganic nitrogen concentration of 58 mg / L and artificial water distribution with a total inorganic nitrogen concentration of 60 mg / L. The hydraulic retention time is set to 6 hours. The treatment device operates for a total of 100 days, and the effluent samples are regularly tested during the operation period.

[0062] During the operation of the device, the total inorganic nitrogen content in the effluent water at different times in the device is measured. The total inorganic nitrogen content is the sum of the nitrate content, ammonia nitrogen content, and nitrite content. The nitrate concentration is measured by ultraviolet spectrophotometry. The specific measurement method is as follows: Take 0.5 mL of the filtered sample into a 100 mL volumetric flask (adjusted according to the actual concentration of the sample), and sequentially add 1 mL of hydrochloric acid solution (1 mM) and 5 mL of ammonium sulfamate solution (50 g / L), mix well and make up the volume. Use an ultraviolet spectrophotometer to measure the absorbance of the sample at wavelengths of 210 nm and 275 nm respectively. The ammonia nitrogen concentration is measured by Nessler's reagent photometry. The specific measurement method is as follows: Take 1 mL of the filtered sample into a 50 mL colorimetric tube (adjusted according to the actual concentration of the sample), make up the volume, add 1 mL of potassium sodium tartrate solution (500 g / L, the ultrapure water needs to be boiled to remove ammonia before preparation) and 1 mL of Nessler's reagent, mix well and let it stand for color development for 10 min. Take 200 μL of the developed solution and add it to a 96-well plate, and use a multifunctional microplate reader to measure the absorbance at a wavelength of 420 nm. The nitrite concentration is measured by Griess reagent spectrophotometry. The specific measurement method is as follows: Take 50 μL of the filtered sample into a 96-well plate (adjusted according to the actual concentration of the sample), sequentially add 50 μL of Griess Reagent I and 50 μL of Griess Reagent II, and measure the absorbance at a wavelength of 540 nm using a multifunctional microplate reader after color development.

[0063] Comparative Examples 1 to 3 are compared with Example 1, and the process parameters of Comparative Examples 1 to 3 are shown in the following table.

[0064] Table 1 Process parameters of Comparative Examples 1 to 3

[0065] Condition parameter Comparative example 1 Comparative example 2 Comparative example 3 Heating temperature control device Close Open Open pH monitoring and adjustment device Open Close Open Aeration device Open Open Close

[0066] In Example 1, the heating and temperature control device, pH monitoring and adjustment device, aeration device, and stirring device are all turned on, and this treatment group is marked as TPO.

[0067] Referring to the process of Example 1, the only difference in Comparative Example 1 is that the heating temperature control device is turned off, and this treatment group is labeled as PO.

[0068] Referring to the process of Example 1, the only difference in Comparative Example 2 is that the pH monitoring and adjustment device is turned off, and this treatment group is labeled as TO.

[0069] Referring to the process of Example 1, the only difference in Comparative Example 3 is that the aeration device is turned off, and this treatment group is labeled as TP.

[0070] After the successful start-up of Example 1 and Comparative Examples 1-3, samples of the effluent were taken and tested for the total inorganic nitrogen content within 100 days of the operation of the artificially configured sewage treatment, to test and compare the operating performance and improvement of the device for enhancing biological nitrogen removal from organic sewage by precise water quality parameter regulation, as Figure 2 shown, the change in the total inorganic nitrogen content in the artificially configured wastewater during the 100-day repair cycle of Example 1 and Comparative Examples 1-3 was obtained. The total inorganic nitrogen concentration in the TPO group always remained at the lowest level. When running to 100 days, the total inorganic nitrogen concentration was stable below 5 mg / L, indicating that the complete regulation of water quality parameters can significantly improve the biological nitrogen removal efficiency of the system. From the initial stage to the end of the operation, the concentration of NO 3 --N in the TPO group continued to decline steadily, showing good stability of the system. Through the coordinated regulation of multiple parameters such as temperature, pH value, and dissolved oxygen concentration, the TPO group maintained the lowest total inorganic nitrogen concentration throughout the operation cycle, proving the importance of precise water quality parameter regulation. The total inorganic nitrogen concentration in the PO group was slightly higher than that in the TPO group, especially showing a slight increase in the later stage of operation (after 80 days), between about 10 mg / L and 15 mg / L, indicating that the heating temperature control device is crucial for maintaining the reaction temperature and supporting nitrification and denitrification reactions. The total inorganic nitrogen concentration in the TP group also remained between 10 mg / L and 15 mg / L throughout the operation cycle, indicating that the aeration device is crucial for maintaining the dissolved oxygen concentration and supporting nitrification and denitrification reactions. The total inorganic nitrogen concentration in the TO group was about 10 mg / L at the initial stage of operation, but gradually increased with time and reached above 30 mg / L at 100 days, indicating that the precise control of pH value plays a key role in the efficiency and stability of the biological nitrogen removal reaction.

[0071] After the successful start-up of Example 1 and Comparative Examples 1-3, samples of the effluent were taken and tested for the total inorganic nitrogen content within 100 days of the operation of the actual domestic sewage treatment, to test and compare the operating performance and improvement of the device for enhancing biological nitrogen removal from organic sewage by precise water quality parameter regulation, as Figure 3As shown, the variation of the total inorganic nitrogen content in actual domestic sewage during the 100-day repair cycle of Example 1 and Comparative Examples 1-3 was obtained. The total inorganic nitrogen concentration in the TPO group remained at a relatively low level throughout the operation, with an average concentration of about 7 mg / L, slightly higher than the total inorganic nitrogen concentration in the artificially configured sewage, which may be due to the more complex water quality composition in actual domestic wastewater. It was significantly lower than that of other groups, indicating that precise water quality parameter regulation (including temperature control, pH control, aeration, and uniform stirring, etc.) could significantly improve the denitrification efficiency. Within the first 20 days of operation, the total inorganic nitrogen concentration decreased rapidly and tended to be stable, indicating that the device quickly entered a stable operation state during the start-up period. The TO group did not use a pH monitoring and regulating device, and its total inorganic nitrogen concentration remained between 30 mg / L and 50 mg / L during the operation, and the removal effect was significantly lower than that of the TPO group, indicating that real-time regulation of pH value was an important parameter for achieving efficient total inorganic nitrogen removal. The TP group did not use an aeration device, and its total inorganic nitrogen concentration fluctuated greatly during the operation, with an average concentration of about 20 mg / L, indicating that insufficient oxygen supply severely restricted the denitrification ability and stability of aerobic microorganisms. The PO group did not use a heating and temperature control device, and its average total inorganic nitrogen concentration was about 20 mg / L, indicating that temperature had a significant impact on the activity of denitrifying microorganisms and the removal of total inorganic nitrogen. The test results show that precise water quality parameter regulation plays an important role in enhancing the efficiency of biological denitrification treatment of organic sewage. Especially under the comprehensive optimization of temperature, pH value, and dissolved oxygen concentration, it can effectively reduce the total inorganic nitrogen concentration in the system and improve the denitrification effect. Compared with the comparative example group without comprehensive regulation, Example 1 showed significant superiority, providing reliable technical support for efficient and green sewage treatment.

[0072] In this specification, specific examples are used to elaborate on the principles and implementation methods of the present invention. The descriptions of the above examples are only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A biological denitrification treatment device for organic sewage, characterized in that: The invention comprises an outer shell, an inner shell, a top plate, a heating and temperature control device, a stirring device, an aeration device, a monitoring device, a gas pressure balancing device, a pH monitoring and regulating device and a controller. The bottoms of the outer shell and the inner shell are both closed structures. The top plate can be detachably mounted on the top of the outer shell. The inner shell is arranged in the outer shell and the top can be detachably mounted on the top plate. A circulating water bath inlet and a circulating water bath outlet are arranged on the outer shell. The heating and temperature control device is used to heat and control the temperature of the water between the outer shell and the inner shell. A device water inlet and a device water outlet are arranged on the inner shell. A first water inlet component is connected to the device water inlet. The first water inlet The component extends to the outside through the outer shell, and the first water outlet component is connected to the water outlet of the device, and the first water outlet component extends to the outside through the outer shell; the pH monitoring and adjusting device includes a pH monitoring component and an acid-base additive, the stirring device, the aeration device, the monitoring device and the pH monitoring component are all arranged on the top plate and extend into the inner shell, the monitoring device is used to monitor the dissolved oxygen concentration of the water in the inner shell, the gas pressure balancing device and the acid-base additive are both arranged on the top plate and are communicated with the inner shell, and the stirring device, the aeration device, the monitoring device, the pH monitoring component and the acid-base additive are all connected to the controller.

2. The biological denitrification treatment device for organic wastewater according to claim 1, characterized in that: The heating and temperature control device comprises a heating rod, a temperature sensor and a temperature controller. The heating rod and the temperature sensor are both arranged on the top plate and extend between the outer shell and the inner shell. The heating rod and the temperature sensor are both connected to the temperature controller.

3. The biological denitrification treatment device for organic wastewater according to claim 1, characterized in that: The circulating water bath water inlet is connected to a second water inlet component, and the circulating water bath water outlet is connected to a second water outlet component.

4. The biological denitrification treatment device for organic wastewater according to claim 1, characterized in that: The circulating water bath water inlet is arranged at the lower part of one side of the outer shell, and the circulating water bath water outlet is arranged at the upper part of the other side of the outer shell; the device water inlet is arranged at the lower part of one side of the inner shell, and the device water outlet is arranged at the upper part of the other side of the inner shell.

5. The biological denitrification treatment device for organic wastewater according to claim 1, characterized in that: The stirring device includes a motor, a stirring shaft and a plurality of stirring blades. The motor is arranged on the top plate. The power output shaft of the motor extends into the inner shell and is connected to the upper end of the stirring shaft. The plurality of stirring blades are arranged on the stirring shaft. The motor is connected to the controller.

6. The biological denitrification treatment device for organic wastewater according to claim 1, characterized in that: The aeration device includes a first gas cylinder, a first air inlet pipe, a first air inlet regulating valve, a second gas cylinder, a second air inlet pipe, a second air inlet regulating valve and an aeration pipe. The aeration pipe is arranged on the top plate and extends into the inner shell. The upper end of the aeration pipe is connected to the first air inlet pipe and the second air inlet pipe. The end of the first air inlet pipe away from the aeration pipe is connected to the first gas cylinder. The first gas is contained in the first gas cylinder, and the first gas is nitrogen or a mixture of nitrogen and carbon dioxide. The first air inlet regulating valve is arranged on the first air inlet pipe. The end of the second air inlet pipe away from the aeration pipe is connected to the second gas cylinder, and the second gas is contained in the second gas cylinder, and the second gas is air or oxygen. The second air inlet regulating valve is arranged on the second air inlet pipe. The first air inlet regulating valve and the second air inlet regulating valve are both connected to the controller.

7. The biological denitrification treatment device for organic wastewater according to claim 1, characterized in that: The monitoring device comprises a dissolved oxygen concentration sensor, which is arranged on the top plate and extends into the inner shell, and is connected to the controller.

8. The biological denitrification treatment device for organic wastewater according to claim 7, characterized in that: The monitoring device further comprises a conductivity sensor and an oxidation-reduction potential sensor, wherein the conductivity sensor and the oxidation-reduction potential sensor are both arranged on the top plate and extend into the inner shell, and the conductivity sensor and the oxidation-reduction potential sensor are both connected to the controller.

9. A method for biological denitrification of organic sewage based on the biological denitrification treatment device for organic sewage according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Put activated sludge in the inner shell, fix the top plate to the top of the inner shell, put the inner shell into the outer shell, and fix the top plate to the top of the outer shell, introduce circulating water between the outer shell and the inner shell through the circulating water bath inlet, and keep the water between the outer shell and the inner shell at a certain temperature through the heating and temperature control device; Step 2: introducing sewage into the inner shell through the first water inlet component and the water inlet of the device, starting the stirring device and the aeration device through the controller, the monitoring device transmitting the measured value of the dissolved oxygen concentration of the water body in the inner shell to the controller, the controller adjusting the aeration device according to the set value of the dissolved oxygen concentration, the pH monitoring component transmitting the measured pH value of the water body in the inner shell to the controller, and the controller controlling the acid-base adder to add phosphate buffer solution or carbonate buffer solution to the water body in the inner shell according to the pH set value; Step three: discharging the treated water through the water outlet of the device and the first water outlet component, and collecting samples from the treated water for nitrogen conversion efficiency analysis.

10. The method for biological denitrification of organic wastewater according to claim 9, characterized in that: In step one, the temperature of the water between the outer shell and the inner shell is 20°C to 40°C; in step two, the dissolved oxygen concentration of the water in the inner shell is 0.2mg / L to 1.5mg / L, and the pH setting value of the water in the inner shell is 6.5-8.5.

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