Intelligent regulation and control reaction device for simulating greenhouse gas emission of sewage pipeline

Abstract

The invention discloses an intelligent regulation and control reaction device for simulating sewage pipeline greenhouse gas emission, and belongs to the technical field of pipe flow type reactors, the intelligent regulation and control reaction device comprises a water inlet tank, a first water pumping mechanism is arranged on the water inlet tank, the first water pumping mechanism is connected with a first pipeline, the first pipeline is connected with a first inspection well, and the first inspection well is connected with a second pipeline; the second pipeline is connected with a second inspection well, the second inspection well is connected with a third pipeline, the third pipeline is connected with a return tank, and a second water pumping mechanism is arranged on the return tank. The invention aims to reproduce complex flow and thermal states caused by factors such as flow velocity, pipe diameter, pipeline layout, hydraulic condition change of an inspection well and external temperature change in an actual sewage pipeline system; meanwhile, different sewage characteristics and pipe wall biological membrane effects are simulated through adjustable inlet water quality parameters and a controllable biological membrane growth environment, so that the generation and dissipation process of the greenhouse gas in the sewage pipeline under multiple influence conditions is accurately simulated.

Description

Technical Field

[0001] This invention relates to the field of tubular flow reactor technology, and in particular to a smart control reaction device for simulating greenhouse gas emissions from sewage pipes. Background Technology

[0002] Wastewater pipe networks are a long-neglected carbon funnel in wastewater systems, accounting for approximately 11.9% of the total carbon emissions, equivalent to 2% of global carbon emissions. The system involves multiphase coupling and dynamic interaction of physical, chemical, and biological processes, significantly influencing wastewater flow and material transformation, and thus profoundly impacting greenhouse gas formation. However, how multiple factors synergistically regulate greenhouse gas production and release under complex pipe network conditions remains largely unresolved.

[0003] To investigate the impact of different environmental conditions on the formation of gaseous pollutants in sewage pipelines, especially the yield and release characteristics of key greenhouse gases such as methane, carbon dioxide, and nitrous oxide, and to systematically analyze their migration and transformation patterns in the gas, liquid, and solid phases, this invention employs a laboratory-scale, airtight reaction device to simulate the operating conditions of a real sewer system. The research results can provide a basis for strategies to control and reduce the formation of gaseous pollutants in pipelines, thereby supporting the achievement of relevant environmental protection goals. Summary of the Invention

[0004] The purpose of this invention is to provide a smart control reaction device for simulating greenhouse gas emissions from sewage pipelines. This device aims to reproduce the complex flow and thermodynamic states caused by factors such as flow velocity, pipe diameter, pipeline layout, changes in manhole hydraulic conditions, and external temperature variations in actual sewage pipeline systems. Simultaneously, the device simulates different sewage characteristics and the effects of biofilm on the pipe wall through adjustable influent water quality parameters and a controllable biofilm growth environment. This allows for accurate simulation of the generation and dissipation of greenhouse gases from sewage pipelines under conditions of multiple physical fields, multiple water qualities, and biofilm influences.

[0005] To achieve the above objectives, the present invention provides a smart control reaction device for simulating greenhouse gas emissions from sewage pipes, comprising an inlet tank, a first pumping mechanism on the inlet tank, a first pipe connected to the other end of the first pumping mechanism, a first inspection well connected to the other end of the first pipe, a second pipe connected to the other end of the first inspection well, a third pipe connected to the other end of the second inspection well, a return tank connected to the other end of the third pipe, a second pumping mechanism on the return tank, and the other end of the second pumping mechanism connected to the first pumping mechanism.

[0006] Preferably, the first pumping mechanism includes a first peristaltic pump and a three-way valve. One end of the first peristaltic pump is connected to a first pipeline, and the other end of the first pipeline is connected to a water inlet tank. The other end of the first peristaltic pump is connected to the three-way valve, and the other end of the three-way valve is connected to a second pipeline. The other end of the second pipeline is connected to the first pipeline, the first inspection well, and the second inspection well, respectively. The second pumping mechanism is connected to the three-way valve.

[0007] Preferably, the second pumping mechanism includes a second peristaltic pump, one end of which is connected to a third pipeline, the other end of which is connected to a return tank, and the other end of which is connected to a fourth pipeline, the other end of which is connected to a three-way valve.

[0008] Preferably, a first regulating valve is installed on the first pipeline, the first inspection well, and the second inspection well, with the other end of the first regulating valve connected to the second pipeline, and a second regulating valve is installed on the third pipeline, with the other end of the second regulating valve connected to the return tank.

[0009] Preferably, both the first and third pipes are equipped with height adjustment brackets for adjusting the overall slope of the device.

[0010] Preferably, the first pipeline, the first inspection well, the second pipeline, the second inspection well, and the third pipeline are all equipped with gas sampling ports for collecting gas.

[0011] Preferably, the water inlet tank, the first pipe, the second pipe, and the third pipe are all equipped with liquid sampling ports for collecting liquid.

[0012] Preferably, heating sleeves for temperature control are provided on the first, second, and third pipes.

[0013] Preferably, both the inlet tank and the return tank are equipped with a stirrer for stirring the liquid.

[0014] Preferably, the side wall of the reflux tank is provided with a drain outlet for discharging liquid.

[0015] Therefore, the present invention employs the aforementioned intelligent control reaction device for simulating greenhouse gas emissions from sewage pipelines, aiming to reproduce the complex flow and thermodynamic states caused by factors such as flow velocity, pipe diameter, pipeline layout, changes in manhole hydraulic conditions, and external temperature changes in actual sewage pipeline systems. Simultaneously, the device simulates different sewage characteristics and the role of pipe wall biofilm through adjustable influent water quality parameters and a controllable biofilm growth environment, thereby accurately simulating the generation and dissipation process of greenhouse gases in sewage pipelines under such conditions of multiple physical fields, multiple water qualities, and biofilm influence.

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the intelligent control reaction device for simulating greenhouse gas emissions from sewage pipes in this invention.

[0018] Figure 2 This is a flowchart of the intelligent control reaction device for simulating greenhouse gas emissions from sewage pipes in this invention.

[0019] Figure Labels

[0020] 1. Inlet tank; 2. First pipeline; 3. First inspection well; 4. Second pipeline; 5. Second inspection well; 6. Third pipeline; 7. Return tank; 8. First peristaltic pump; 9. Three-way valve; 10. First pipeline; 11. Second pipeline; 12. Second peristaltic pump; 13. Third pipeline; 14. Fourth pipeline; 15. First regulating valve; 16. Second regulating valve; 17. Height adjustment bracket; 18. Gas sampling port; 19. Liquid sampling port; 20. Heating sleeve; 21. Stirrer; 22. Drain outlet. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] like Figure 1 and Figure 2As shown, a smart control reaction device for simulating greenhouse gas emissions from sewage pipes includes an inlet tank 1 equipped with a first pumping mechanism. The other end of the first pumping mechanism is connected to a first pipe 2. The other end of the first pipe 2 is detachably sealed to a first inspection well 3 via a flange, gasket, and bolts. The other end of the first inspection well 3 is detachably sealed to a second pipe 4 via a flange, gasket, and bolts. The other end of the second pipe 4 is detachably sealed to a second inspection well 5 via a flange, gasket, and bolts. The other end of the second inspection well 5 is detachably sealed to a third pipe 6 via a flange, gasket, and bolts. The other end of the third pipe 6 is connected to a return tank 7, on which a second pumping mechanism is installed. The other end of the second pumping mechanism is connected to the first pumping mechanism. The entire device is equipped with a controller (not shown in the figure), which is used to control the overall experimental conditions of the device.

[0024] The inlet tank 1 can dispense water and adjust parameters such as pH, COD, and C / N ratio. The inner diameters of the first pipe 2, the second pipe 4, and the third pipe 6 increase sequentially, and the highest points of the first pipe 2, the second pipe 4, and the third pipe 6 are kept at the same horizontal line. This simulates the complex hydraulic state caused by the change in flow velocity of sewage in a real sewer with the pipe diameter, and provides a physical basis for studying biofilm growth and material transport under different shear forces.

[0025] One end of the first peristaltic pump 8 is connected to the first pipeline 10 via a flange, and the other end of the first pipeline 10 is inserted into the interior of the water inlet tank 1. The other end of the first peristaltic pump 8 is connected to a three-way valve 9, and the other end of the three-way valve 9 is connected to a second pipeline 11 via a flange. The other end of the second pipeline 11 is connected to the first pipeline 2, the first inspection well 3, and the second inspection well 5, respectively. Preferably, the first peristaltic pump 8 can adjust the flow rate, and the first peristaltic pump 8 is connected to an external power source.

[0026] One end of the second peristaltic pump 12 is connected to a third pipe 13 via a flange, and the other end of the third pipe 13 is inserted into the interior of the reflux tank 7. The other end of the second peristaltic pump 12 is connected to a fourth pipe 14 via a flange, and the other end of the fourth pipe 14 is connected to a three-way valve 9 via a flange. Preferably, the second peristaltic pump 12 can adjust the flow rate, and the second peristaltic pump 12 is connected to an external power supply.

[0027] A first regulating valve 15 is installed at the front end of the first pipe 2, and the other end of the first regulating valve 15 is connected to the second pipe 11. A first regulating valve 15 is installed at the center of the manhole cover of the first inspection well 3, and the other end of the first regulating valve 15 is connected to the second pipe 11. A first regulating valve 15 is installed at the center of the manhole cover of the second inspection well 5, and the other end of the first regulating valve 15 is connected to the second pipe 11. A second regulating valve 16 is installed at the rear end of the third pipe 6, and the other end of the second regulating valve 16 is connected to the return tank 7.

[0028] The first regulating valve 15 at the front end of the first pipe 2 serves as the "master switch" for the entire water inlet mechanism, allowing for preliminary and wide-range adjustment of the total water volume entering the reactor. The first regulating valve 15 at the center of the covers of the first inspection well 3 and the second inspection well 5 serves as the water inlet, playing a role in "local adjustment." By adjusting the regulating valves on the corresponding inspection well covers, the water flow in each area can be independently controlled, allowing the water flow to be rationally distributed to various parts of the reactor according to actual needs. This ensures that the reaction conditions in each area of ​​the reactor reach the optimal state and can simulate secondary water intake in a real sewer environment. The second regulating valve 16 at the rear end of the third pipe 6 serves as the water outlet and is the "controller" for reactor drainage. It can precisely control the outflow of water according to the conditions inside the reactor and experimental requirements, extending the residence time of water in the reactor.

[0029] Furthermore, the hydraulic jump phenomenon generated at the inspection well will significantly change the local hydraulic conditions, such as the velocity distribution and turbulence intensity, thereby causing more gas to escape from the sewage. By simulating this complex working condition, the aim is to more realistically reflect the gas-liquid interaction in the actual sewer system and provide more valuable experimental data and simulation environment for related fields.

[0030] To further simulate the long-term residence of sewage in the pipeline, the water effluent from the rear end of the third pipeline 6 is first precisely controlled by the second regulating valve 16, and then flows into the sealed return tank 7. The wastewater stored in the return tank 7 can be pumped back into the system by the second peristaltic pump 12 to participate in the circulation.

[0031] This design allows the device to operate in both a one-time fresh water mode and a circulation mode to simulate long-term retention scenarios, making it irreplaceable for studying the long-term evolution of water quality and the stable state of biofilms.

[0032] Height adjustment brackets 17 are installed at the front end of the bottom surface of the first pipe 2 and the rear end of the bottom surface of the third pipe 6. The height adjustment brackets 17 are used to adjust the overall slope of the device, so that the slope of the pipe can be precisely controlled, thereby simulating the gravity flow state, which is a key factor affecting the flow state and gas accumulation in the pipe.

[0033] Gas sampling ports 18 are installed at the center of the top surface of the first pipe 2, above the manhole cover of the first inspection well 3, at the center of the top surface of the second pipe 4, above the manhole cover of the second inspection well 5, and at the center of the top surface of the third pipe 6. The gas sampling ports 18 can not only collect the gas produced by the reaction inside the device, but also capture the changes in gas caused by gas-liquid agitation when a hydraulic jump occurs in the inspection well.

[0034] The structure of the gas sampling port 18 consists of a female threaded connector, a two-way ball valve, and a diaphragm sealing cap connected in sequence, forming a double sealing guarantee. During non-sampling periods, it can effectively prevent gas leakage and ensure the stability of the internal environment of the system. During sampling, the operation can be completed simply by piercing the diaphragm, which is convenient and quick, and can minimize gas escape and ensure the accuracy of sampling data.

[0035] Liquid sampling ports 19 are installed on the middle of the side wall of the water inlet tank 1, the rear end of the side wall of the first pipe 2, the rear end of the side wall of the second pipe 4, and the rear end of the side wall of the third pipe 6. The setting of the liquid sampling ports 19 ensures that the collected liquid samples are representative and can more accurately reflect the actual condition of the liquid in the device.

[0036] The liquid sampling port 19 adopts a two-way ball valve with a silicone hose with a clamp. The two-way ball valve can precisely control the flow of liquid, while the silicone hose with a clamp further enhances the sealing during the sampling process, preventing liquid leakage from interfering with the experiment and ensuring the reliability and accuracy of the sampling operation.

[0037] Since the first inspection well 3 and the second inspection well 5 adopt a sealed cover design, the cover can be opened at any time during the experiment to conduct biological sampling as needed, which greatly facilitates microbial research. There are two ways to conduct biological sampling. One way is to directly extract the activated sludge at the bottom of the inspection well. This method can obtain the naturally settled microbial community in the pipeline and reflect the microbial ecology at the bottom of the pipeline. The other way is to collect biofilm by placing a biofilm carrier.

[0038] The specific operation is as follows: Inside the first inspection well 3 and the second inspection well 5, an appropriate number of cast iron sheets are placed as biofilm carriers. The edges of the sheets are drilled, and then corrosion-resistant sterile nylon ropes or steel wires are used to firmly fix the sheets to the well cover. This ensures that the sheets will not detach with the flow of wastewater during the experiment and will remain stably in the inspection well, providing a stable attachment environment for biofilm growth. This design allows researchers to obtain highly representative biofilm samples without interrupting the experiment or damaging the biofilm community in the main pipeline.

[0039] The first pipe 2, the second pipe 4, and the third pipe 6 are all equipped with heating sleeves 20. The heating sleeves 20 are connected to an external power source and have high-precision temperature control capabilities. They can maintain the wastewater temperature within the preset range based on the simulated sewer environment temperature value, eliminating the interference of environmental temperature fluctuations on the biochemical reaction, ensuring the uniformity of the influent water quality, preventing sedimentation, and ensuring the accuracy and comparability of experimental data.

[0040] A stirrer 21 is installed at the top of both the inlet tank 1 and the return tank 7. The stirrer 21 is connected to an external power source and can continuously and evenly stir the wastewater, so that the various components in the wastewater are fully mixed, ensuring the uniformity of the inlet water quality, preventing the formation of sediment, and further ensuring the accuracy and comparability of the experimental data, providing a strong guarantee for subsequent data analysis and the conclusion of research.

[0041] A drain port 22 is installed at the lower end of the side wall of the reflux tank 7. After the experiment is completed, the drain port 22 is used to drain the liquid inside the device to prepare for subsequent experiments.

[0042] To ensure convenient connection and reliable sealing of the device, male quick-connect fittings were welded at each interface, and Teflon tubing was used in conjunction with female quick-connect fittings for connection. This enabled quick and sealed connection and disassembly of each module, greatly improving the experimental efficiency of the device.

[0043] To achieve the objectives of this invention, several alternative solutions exist for the above technical solutions. The cast iron pipes in this device can be replaced with materials with good corrosion resistance, such as stainless steel, UPVC, or HDPE. The heating jacket 20 can be replaced with a temperature control method consisting of a tubular heat exchanger and a circulating water bath. The sealing form of the gas sampling port 18 and the liquid sampling port 19 can be replaced by an integrated diaphragm valve instead of a separate ball valve and sealing cap combination. The quick-connect coupling can also be replaced with other quick-sealing connection types such as clamp type or Luer coupling as needed.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A smart control reaction device for simulating greenhouse gas emissions from sewage pipes, characterized in that: The system includes an inlet tank, on which a first pumping mechanism is installed. The other end of the first pumping mechanism is connected to a first pipe, the other end of the first pipe is connected to a first inspection well, the other end of the first inspection well is connected to a second pipe, the other end of the second pipe is connected to a second inspection well, the other end of the second inspection well is connected to a third pipe, the other end of the third pipe is connected to a return tank, and the return tank is equipped with a second pumping mechanism, the other end of which is connected to the first pumping mechanism.

2. The intelligent control reaction device for simulating greenhouse gas emissions from sewage pipes according to claim 1, characterized in that: The first pumping mechanism includes a first peristaltic pump and a three-way valve. One end of the first peristaltic pump is connected to a first pipeline, and the other end of the first pipeline is connected to the water inlet tank. The other end of the first peristaltic pump is connected to the three-way valve, and the other end of the three-way valve is connected to a second pipeline. The other end of the second pipeline is connected to the first pipeline, the first inspection well, and the second inspection well, respectively. The second pumping mechanism is connected to the three-way valve.

3. The intelligent control reaction device for simulating greenhouse gas emissions from sewage pipes according to claim 2, characterized in that: The second pumping mechanism includes a second peristaltic pump, one end of which is connected to a third pipeline, the other end of which is connected to the return tank, and the other end of which is connected to a fourth pipeline, the other end of which is connected to the three-way valve.

4. The intelligent control reaction device for simulating greenhouse gas emissions from sewage pipes according to claim 2, characterized in that: A first regulating valve is installed on the first pipeline, the first inspection well, and the second inspection well. The other end of the first regulating valve is connected to the second pipeline. A second regulating valve is installed on the third pipeline. The other end of the second regulating valve is connected to the return tank.

5. The intelligent control reaction device for simulating greenhouse gas emissions from sewage pipes according to claim 1, characterized in that: Both the first and third pipes are equipped with height adjustment brackets for adjusting the overall slope of the device.

6. The intelligent control reaction device for simulating greenhouse gas emissions from sewage pipes according to claim 1, characterized in that: The first pipeline, the first inspection well, the second pipeline, the second inspection well, and the third pipeline are all equipped with gas sampling ports for collecting gas.

7. The intelligent control reaction device for simulating greenhouse gas emissions from sewage pipes according to claim 6, characterized in that: The water inlet tank, the first pipe, the second pipe, and the third pipe are all equipped with liquid sampling ports for collecting liquid.

8. The intelligent control reaction device for simulating greenhouse gas emissions from sewage pipes according to claim 7, characterized in that: Heating sleeves for temperature control are installed on the first, second, and third pipes.

9. A smart control reaction device for simulating greenhouse gas emissions from sewage pipes according to claim 8, characterized in that: Both the inlet tank and the return tank are equipped with agitators for stirring the liquid.

10. A smart control reaction device for simulating greenhouse gas emissions from sewage pipes according to claim 9, characterized in that: The side wall of the reflux tank is provided with a drain outlet for discharging liquid.

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