Anaerobic ammonia oxidation treatment system and method with shear flow intensity responding to influent concentration

Abstract

The invention relates to the technical field of biological sewage treatment, in particular to an anaerobic ammonia oxidation treatment system and method with shear flow intensity responding to inflow concentration. The invention relates to an anaerobic ammonia oxidation treatment system with shear flow intensity responding to inlet water concentration. The anaerobic ammonia oxidation treatment system comprises an inlet water and outlet water nitrogen concentration online monitoring device, a sequencing batch anaerobic ammonia oxidation reactor, a rotating speed adjustable stirring device and a control system. According to the anaerobic ammonia oxidation treatment system with the shear flow intensity responding to the inlet water concentration, the shear flow of the reactor can be adjusted in real time according to the nitrogen concentration of the inlet water and the outlet water, mass transfer is converted into an adjustable optimization factor from a limiting factor, and therefore stable and efficient operation of the anaerobic ammonia oxidation reactor is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage biological treatment systems, and in particular to an anaerobic ammonia oxidation treatment system and method in which shear flow intensity responds to influent concentration. Background Art

[0002] The annual increase in sewage discharge has posed a challenge to the existing activated sludge sewage treatment process, because the activated sludge process not only has high operating costs, but also produces a large amount of sludge solid waste. In contrast, anaerobic ammonium oxidation technology is the most economical and energy-saving sewage denitrification and sludge reduction technology to date. It is reported that its operating costs can be reduced by 20-40% and sludge discharge can be reduced by 70%. However, because anaerobic ammonium oxidizing bacteria grow slowly and are sensitive to environmental changes, the stable operation of anaerobic ammonium oxidation is still difficult. The results based on machine learning, fluid mechanics simulation and experimental verification reveal that in the anaerobic ammonium oxidation process, mass transfer is an important limiting factor that can be used to regulate the efficiency of anaerobic ammonium oxidation, which helps to stabilize and efficiently operate anaerobic ammonium oxidation. Mass transfer can be enhanced in stirred reactors by increasing shear flow and can be quantitatively described by stirring input energy. Therefore, selecting the appropriate shear flow intensity in the anaerobic ammonium oxidation process is a key step in the treatment effect of the anaerobic ammonium oxidation reactor.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] The object of the present invention is to provide an anaerobic ammonium oxidation treatment system and method in which the shear flow intensity responds to the influent concentration, which can realize the anaerobic ammonium oxidation treatment system and method of adjusting the reactor shear flow according to the inlet and outlet nitrogen concentrations in real time, and transform mass transfer from a limiting factor to a controllable optimization factor, thereby realizing stable and efficient operation of the anaerobic ammonium oxidation reactor.

[0005] The present invention provides an anaerobic ammonium oxidation treatment system with shear flow intensity responsive to influent concentration, comprising: an online monitoring device for influent and effluent nitrogen concentrations, a sequencing batch anaerobic ammonium oxidation reactor, an adjustable speed stirring device and a control system, wherein the control system is signal-connected to the online monitoring device for influent and effluent nitrogen concentrations and the adjustable speed stirring device; the online monitoring device for influent and effluent nitrogen concentrations comprises an online monitoring device for influent nitrogen concentrations and an online monitoring device for effluent nitrogen concentrations, which are respectively located at the influent side and the effluent side of the sequencing batch anaerobic ammonium oxidation reactor; and a stirring mechanism of the adjustable speed stirring device is located in the sequencing batch anaerobic ammonium oxidation reactor.

[0006] In some preferred embodiments, the sequencing batch anaerobic ammonium oxidation reactor is connected to a water inlet pipe and a water outlet pipe, the water inlet pipe is provided with a first electric valve and a first water pump, and the water outlet pipe is provided with a second electric valve and a second water pump.

[0007] In some preferred embodiments, the anaerobic ammonium oxidation treatment system is further provided with an inlet liquid storage tank and an outlet liquid storage tank. The inlet liquid storage tank is connected to the sequencing batch anaerobic ammonium oxidation reactor through an inlet pipe, and the outlet liquid storage tank is connected to the sequencing batch anaerobic ammonium oxidation reactor through an outlet pipe.

[0008] In some preferred embodiments, the online monitoring device for inlet and outlet water nitrogen concentration includes an ammonia nitrogen ion electrode and an ammonia nitrogen ion electrode sensor, the ammonia nitrogen ion electrode and the ammonia nitrogen ion electrode sensor are signal-connected, the first ammonia nitrogen ion electrode is located on the inlet side of the sequencing batch anaerobic ammonium oxidation reactor, and the second ammonia nitrogen ion electrode is located on the outlet side of the sequencing batch anaerobic ammonium oxidation reactor.

[0009] In some preferred embodiments, the adjustable speed mixer device includes a stirring mechanism, a mixer controller and a power meter. The power meter is coupled to the stirring mechanism, the power meter is connected to the control system signal, the mixer controller is connected to the control system signal, and the mixer controller regulates the speed of the stirring mechanism.

[0010] In some preferred embodiments, the stirring mechanism includes a stirrer rotor and a stirring paddle, the power meter is coupled to the stirring paddle, and the stirrer controller is connected to the stirrer rotor via a motor.

[0011] In some preferred embodiments, the control system includes a central controller and an electronic computer for controlling the central controller to perform model training and model deployment, and the central controller is signal-connected to an online monitoring device for inlet and outlet water nitrogen concentration and an adjustable speed stirring device.

[0012] The present invention also provides an anaerobic ammonia oxidation treatment method with shear flow intensity responsive to influent concentration, comprising the following steps: sending sewage into a sequencing batch anaerobic ammonia oxidation reactor, controlling the ratio of nitrite to ammonia nitrogen in the influent to be a fixed value, uploading the influent and effluent ammonia nitrogen concentration values ​​to the control system through an influent and effluent nitrogen concentration online detection device, and the control system calculating the effluent total nitrogen concentration; when the effluent total nitrogen concentration meets the discharge requirements, the input power of the adjustable speed stirring device remains unchanged; when the effluent total nitrogen concentration does not meet the discharge requirements, adjusting the input power of the adjustable speed stirring device according to model training, performing the reaction again to detect whether the discharge requirements are met, and the treated sewage that meets the discharge requirements is discharged from the outlet pipe.

[0013] In some preferred embodiments, the ratio of nitrite to ammonia nitrogen in the influent is 1.32:1.

[0014] In some preferred embodiments, the speed of the adjustable speed agitator is always lower than 210 rpm.

[0015] The present invention has the following beneficial effects: the control system can monitor the inlet and outlet nitrogen concentrations in real time according to the inlet and outlet nitrogen concentration online monitoring device, and the control system affects the shear flow of the anaerobic ammonium oxidation reactor by regulating the speed of the adjustable speed stirring device, thereby converting mass transfer from a limiting factor for the stable operation of anaerobic ammonium oxidation to an adjustable optimization factor, thereby achieving stable and efficient operation of the anaerobic ammonium oxidation reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 Schematic diagram of anaerobic ammonium oxidation treatment system.

[0018] Figure 2 To control the model training of the algorithm.

[0019] Figure 3 For; model application of control algorithm.

[0020] Icons: 1-ammonia nitrogen ion electrode sensor; 2-water inlet; 3-ammonia nitrogen ion electrode; 4-water inlet storage tank; 5-electric gate; 6-water pump; 7-mixer rotor; 8-mixing paddle; 9-sequencing batch anaerobic ammonium oxidation reactor; 10-mixer controller; 11-central controller; 12-electronic computer; 13-water outlet storage tank. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0022] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0023] Example

[0024] like Figure 1 As shown, an embodiment of the present application provides an anaerobic ammonium oxidation treatment system in which shear flow intensity responds to influent concentration, including an online monitoring device for inlet and outlet nitrogen concentration, a sequencing batch anaerobic ammonium oxidation reactor, an adjustable speed stirring device and a control system.

[0025] The anaerobic ammonium oxidation treatment system is provided with an inlet liquid storage tank 4 for storing part of the sewage treated by the nitrification reaction tank. The inlet liquid storage tank 4 is connected to the sequencing batch anaerobic ammonium oxidation reactor 9 through an inlet pipe. The inlet pipe is provided with a first electric gate 5 and a first water pump 6 for lifting the sewage at the bottom of the inlet liquid storage tank 4 to the sequencing batch anaerobic ammonium oxidation reactor.

[0026] An online monitoring device for inlet nitrogen concentration is placed in the inlet liquid storage tank 4. The online monitoring device for inlet nitrogen concentration includes a first ammonia nitrogen ion electrode 3 and a first ammonia nitrogen ion electrode sensor 1. The first ammonia nitrogen ion electrode 3 and the first ammonia nitrogen ion electrode sensor 1 are signal-connected. The first ammonia nitrogen ion electrode 3 is placed in the inlet liquid storage tank 4 to store sewage. The detected ammonia nitrogen ion concentration is transmitted to the first ammonia nitrogen ion electrode sensor 1 through a signal. The first ammonia nitrogen ion electrode sensor 1 transmits the received numerical signal to the control system.

[0027] The adjustable speed stirring mechanism device includes a stirring mechanism, a stirrer controller 10 and a power meter, the stirring mechanism includes a stirrer rotor 7 and a stirring paddle 8; the power meter is connected to the control system signal, and the power meter is coupled to the stirring paddle 8 to obtain the stirring paddle input power at different speeds and upload the detected value to the control system; the stirrer controller 10 is connected to the control system signal, and after receiving the control system signal, the stirrer controller 10 controls the motor speed through the electronic speed regulator to adjust the speed of the stirrer rotor 7.

[0028] A stirring mechanism is placed in the sequencing batch anaerobic ammonium oxidation reactor 9, and the anaerobic ammonium oxidation reaction of the sewage is carried out in the sequencing batch anaerobic ammonium oxidation reactor 9 through the stirring mechanism. The sequencing batch anaerobic ammonium oxidation reactor is a closed reactor, which can control the reaction conditions to ensure the efficiency and stability of the anaerobic ammonium oxidation process, and also help to reduce environmental pollution and resource waste and improve energy utilization.

[0029] The sequencing batch anaerobic ammonium oxidation treatment system is also provided with an effluent storage tank 13 for storing sewage treated by the sequencing batch anaerobic ammonium oxidation reactor 9. The effluent storage tank 13 is connected to the sequencing batch anaerobic ammonium oxidation reactor 9 through an outlet pipe. A second electric gate 5 and a second water pump 6 are provided on the outlet pipe to lift the sewage treated by the sequencing batch anaerobic ammonium oxidation reactor from the bottom sewage of the sequencing batch anaerobic ammonium oxidation reactor to the effluent storage tank.

[0030] An online monitoring device for effluent nitrogen concentration is placed in the effluent liquid storage tank 13, and the online monitoring device for effluent nitrogen concentration includes a second ammonia nitrogen ion electrode 3 and a second ammonia nitrogen ion electrode sensor 1. The second ammonia nitrogen ion electrode 3 is placed in the sewage stored in the effluent liquid storage tank 13, and the detected effluent ammonia nitrogen ion concentration is transmitted to the second ammonia nitrogen ion electrode sensor 1 through a signal, and the second ammonia nitrogen ion electrode sensor 1 transmits the received numerical signal to the control system.

[0031] The outlet liquid storage tank is also provided with an outlet, on which a third electric gate 5 is provided. When the nitrogen concentration of the treated sewage finally meets the discharge requirements, the sewage is discharged from the outlet under the control of the third electric gate 5 .

[0032] The control system includes a central controller 11 and an electronic computer 12. The central controller 11 is connected to the inlet and outlet water ammonia nitrogen ion electrode sensor 1 and the mixer controller 10 by signal. The central controller 11 receives the numerical value uploaded by the inlet and outlet water nitrogen concentration online monitoring device, and performs model training and model deployment under the control of the electronic computer 12, and transmits the signal to the mixer controller 10 to adjust the speed of the mixer rotor 7.

[0033] A shear flow intensity responsive influent concentration anaerobic ammonium oxidation treatment method comprises the following steps: firstly, sewage treated in a part of a nitrification reaction tank is connected, and the ratio of nitrite nitrogen to ammonia nitrogen in the influent is a fixed value, and the sewage is sent into an influent liquid storage tank 4 through an inlet 2, and the influent ammonia nitrogen concentration is monitored by a first ammonia nitrogen ion electrode 3 and a first ammonia nitrogen ion electrode sensor 1, and the value is transmitted to a central controller 11, and the central controller 11 is controlled by an electronic computer 12. After simulation training, the central controller 11 transmits the speed signal of the required stirring device to the mixer controller 10, and the mixer controller 10 controls the speed of the mixer rotor 7 during the reaction process through an adjustable speed motor. Then the first electric gate 5 is opened, and the sewage is lifted by the first water pump 6 to a sequencing batch anaerobic ammonium oxidation reactor 9. The operation characteristics of the sequencing batch anaerobic ammonium oxidation reactor 9 are set: the influent process is 5 minutes, the reaction process is 11.5 hours, the sedimentation process is 20 minutes, the water discharge is 5 minutes, the reactor sewage exchange ratio is 50%, and the sewage entering the sequencing batch anaerobic ammonium oxidation reactor 9 is subjected to reaction treatment. Then the treated sewage passes through the second electric gate 5, and is lifted by the second water pump 6 to the effluent liquid storage tank 13. The effluent ammonia nitrogen concentration is monitored by the second ammonia nitrogen ion electrode 3 and the second ammonia nitrogen ion electrode sensor 1, and the value is transmitted to the central controller 11. The central controller 11 can calculate the effluent total nitrogen concentration based on the proportional relationship of the reaction stoichiometric formula of the anaerobic ammonia oxidation process and the ammonia nitrogen concentration of the effluent. If the total nitrogen concentration of the treated sewage finally meets the discharge requirements, it is discharged through the third electric gate 5.

[0034] Preferably, the ratio of nitrite to ammonia nitrogen in the sewage entering the storage tank is 1.32:1.

[0035] Preferably, the speed of the mixer rotor should be always lower than 210 rpm.

[0036] like Figure 2As shown, it is a model training of the control algorithm in an anaerobic ammonia oxidation treatment system in which the shear flow intensity responds to the influent concentration in the present application. The online monitoring device for the inlet and outlet nitrogen concentration transmits the ammonia nitrogen concentration of the inlet and outlet water to the control system, and the power meter transmits the detected stirring input power value to the control system. The control system calculates the ammonia nitrogen removal rate, thereby calculating the ammonia nitrogen removal rate-stirring input power relationship, and then the anaerobic ammonia oxidation reaction dose ratio is converted to obtain the total nitrogen removal rate-stirring input power relationship.

[0037] like Figure 3 As shown, a model application of a control algorithm in an anaerobic ammonia oxidation treatment system in which the shear flow intensity responds to the influent concentration in the present application, the inlet and outlet nitrogen concentration online monitoring device transmits the ammonia nitrogen concentration of the inlet and outlet water to the control system, and the control system calculates the total nitrogen concentration of the outlet water. When the total nitrogen concentration of the outlet water meets the discharge requirements, the input power of the adjustable speed stirring device remains unchanged; when the total nitrogen concentration of the outlet water does not meet the discharge requirements, the input power of the adjustable speed stirring device is adjusted according to the model training, and the reaction is carried out again to detect whether the discharge requirements are met, and the treated sewage that meets the discharge requirements is discharged from the outlet pipe.

[0038] In summary, the present invention realizes a treatment system based on using an online detection device for influent nitrogen concentration to detect the influent nitrogen concentration so as to control the shear flow of the anaerobic ammonium oxidation reactor in real time, and changes the speed of the stirring rotor by adjusting the adjustable speed stirring device, thereby optimizing the mass transfer effect inside the reactor, and realizing stable and efficient operation of the reactor. And according to the measured data, when the rotor speed of the stirrer is 200rpm / minute, the denitrification effect of the anaerobic ammonium oxidation reactor can reach the maximum denitrification value of the anaerobic ammonium oxidation theory (i.e. 80%).

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anaerobic ammonium oxidation treatment system in which the shear flow intensity responds to the influent concentration, characterized in that: The treatment system includes: an online monitoring device for inlet and outlet water nitrogen concentration, a sequencing batch anaerobic ammonium oxidation reactor, an adjustable speed stirring device and a control system. The control system is signal-connected to the online monitoring device for inlet and outlet water nitrogen concentration and the adjustable speed stirring device. The online monitoring device for inlet and outlet water nitrogen concentration includes an online monitoring device for inlet water nitrogen concentration and an online monitoring device for outlet water nitrogen concentration, which are respectively located at the inlet side and the outlet side of the sequencing batch anaerobic ammonium oxidation reactor. The stirring mechanism of the adjustable speed stirring device is located in the sequencing batch anaerobic ammonium oxidation reactor.

2. The anaerobic ammonium oxidation treatment system with shear flow intensity responsive to influent concentration according to claim 1, characterized in that: The sequencing batch anaerobic ammonium oxidation reactor is connected to a water inlet pipe and a water outlet pipe, the water inlet pipe is provided with a first electric valve and a first water pump, and the water outlet pipe is provided with a second electric valve and a second water pump.

3. The anaerobic ammonium oxidation treatment system with shear flow intensity responsive to influent concentration according to claim 2, characterized in that: The anaerobic ammonium oxidation treatment system is also provided with an inlet liquid storage tank and an outlet liquid storage tank. The inlet liquid storage tank is connected to the sequencing batch type anaerobic ammonium oxidation reactor through the inlet pipe, and the outlet liquid storage tank is connected to the sequencing batch type anaerobic ammonium oxidation reactor through the outlet pipe.

4. The anaerobic ammonium oxidation treatment system with shear flow intensity responsive to influent concentration according to claim 1, characterized in that: The online monitoring device for inlet and outlet water nitrogen concentration includes an ammonia nitrogen ion electrode and an ammonia nitrogen ion electrode sensor. The ammonia nitrogen ion electrode and the ammonia nitrogen ion electrode sensor are signal-connected. The first ammonia nitrogen ion electrode is located on the inlet side of the sequencing batch anaerobic ammonium oxidation reactor, and the second ammonia nitrogen ion electrode is located on the outlet side of the sequencing batch anaerobic ammonium oxidation reactor.

5. The anaerobic ammonium oxidation treatment system with shear flow intensity responsive to influent concentration according to claim 1, characterized in that: The adjustable speed mixer device includes a stirring mechanism, a mixer controller and a power meter. The power meter is coupled to the stirring mechanism, the power meter is connected to the control system signal, the mixer controller is connected to the control system signal, and the mixer controller regulates the speed of the stirring mechanism.

6. The anaerobic ammonium oxidation treatment system with shear flow intensity responsive to influent concentration according to claim 5, characterized in that: The stirring mechanism comprises a stirring machine rotor and a stirring paddle, the power measuring device is coupled to the stirring paddle, and the stirring machine controller is connected to the stirring machine rotor via a motor.

7. The anaerobic ammonium oxidation treatment system with shear flow intensity responsive to influent concentration according to claim 1, characterized in that: The control system includes a central controller and an electronic computer for controlling the central controller to perform model training and model deployment. The central controller is signal-connected to the inlet and outlet water nitrogen concentration online monitoring device and the adjustable speed stirring device.

8. An anaerobic ammonium oxidation treatment method in which the shear flow intensity responds to the influent concentration, used in the anaerobic ammonium oxidation treatment system in which the shear flow intensity responds to the influent concentration according to any one of claims 1 to 7, characterized in that: The sewage is sent into the sequencing batch anaerobic ammonium oxidation reactor, and the ratio of nitrite to ammonia nitrogen in the inlet water is controlled to be a fixed value. After uploading the ammonia nitrogen concentration values ​​of the inlet and outlet water to the control system through the inlet and outlet water nitrogen concentration online monitoring device, the control system calculates the total nitrogen concentration of the outlet water. When the total nitrogen concentration of the outlet water meets the discharge requirements, the input power of the adjustable speed stirring device remains unchanged; When the total nitrogen concentration of the effluent does not meet the discharge requirements, the input power of the adjustable speed stirring device is adjusted according to the model training, and the reaction is performed again to detect whether the discharge requirements are met. The treated sewage that meets the discharge requirements is discharged from the outlet pipe.

9. The anaerobic ammonium oxidation treatment method with shear flow intensity responsive to influent concentration according to claim 8, characterized in that: The ratio of nitrite to ammonia nitrogen in the influent is 1.32:

1.

10. The anaerobic ammonium oxidation treatment method with shear flow intensity responsive to influent concentration according to claim 8, characterized in that: The speed of the adjustable speed stirring device is always lower than 210 rpm.

Images