Precise oxygen control system

Abstract

The utility model relates to the technical field of sewage treatment, and provides an oxygen precision control system, which comprises a biochemical subsystem, a plurality of monitors, a first flow meter and an air blower assembly, the plurality of monitors are used for monitoring the amount of first oxygen required to be consumed for degrading carbon-containing organic matters in the biochemical subsystem, the amount of ammonia nitrogen generated in a nitrification process in the biochemical subsystem and the nitrogen removal amount in a denitrification process of the biochemical subsystem; the first flow meter is arranged on a sewage discharge pipeline of the biochemical subsystem and is used for monitoring the residual sludge discharge amount; the air blower assembly is arranged outside the biochemical subsystem, and the aeration rate of the biochemical subsystem can be adjusted by adjusting the rotating speed of the air blower assembly. According to the oxygen precise control system, the quality of sewage in the biochemical subsystem can be monitored in real time, the actual total oxygen demand is calculated, the aeration rate can be precisely controlled by precisely controlling the rotating speed of the air blower assembly, and oxygen precise control is achieved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a precision oxygen control system. Background Technology

[0002] The energy consumption of aeration in the biological treatment tank accounts for approximately 51% of the total energy consumption of a wastewater treatment plant. Therefore, achieving energy-efficient operation of the aeration system is crucial for energy conservation in wastewater treatment plants. Excessive aeration directly wastes electricity, and dissolved oxygen is carried to the anoxic zone through internal recirculation, affecting denitrification. Dissolved oxygen is also carried to the anaerobic zone through external recirculation, affecting the anaerobic phosphorus release process. Insufficient aeration will affect the degradation of pollutants by microorganisms in the biological treatment tank and may also cause denitrification in the secondary sedimentation tank, leading to sludge floating and affecting effluent quality.

[0003] The goal of aeration flow control is to create stable dissolved oxygen conditions, establishing a dynamic balance and reliable living environment for microbial growth and pollutant degradation. The essence of this dynamic balance process is to make the total oxygen transfer rate approximately equal to the total oxygen consumption rate. Since the influent water quality and quantity of wastewater treatment plants vary, their oxygen consumption also varies over specific time periods. Only by balancing the oxygen supply and consumption during these periods can the stability of the treatment environment and the quality of the effluent be guaranteed. Therefore, providing a precise oxygen control system to achieve accurate aeration by blowers and thus energy saving has become an urgent problem to be solved in the industry. Utility Model Content

[0004] This invention provides a precision oxygen control system to achieve accurate aeration by a blower.

[0005] This utility model provides an oxygen precision control system, comprising: a biochemical subsystem, multiple monitoring instruments, a first flow meter, and a blower assembly. The biochemical subsystem is connected to an inlet pipe. The multiple monitoring instruments are installed at the inlet pipe and the outlet of the biochemical subsystem, and are used to monitor the amount of first oxygen consumed for the degradation of carbonaceous organic matter in the biochemical subsystem, the amount of ammonia nitrogen produced during nitrification in the biochemical subsystem, and the amount of nitrogen removed during denitrification in the biochemical subsystem. The first flow meter is installed on the sewage discharge pipe of the biochemical subsystem and is used to monitor the amount of residual sludge discharged. The blower assembly is installed outside the biochemical subsystem, and adjusting the speed of the blower assembly can adjust the aeration rate of the biochemical subsystem.

[0006] According to the present invention, an oxygen precision control system includes a plurality of monitoring instruments, including a first chemical oxygen demand (COD) monitoring instrument. The first COD monitoring instrument is installed in the water inlet pipeline and is used to monitor the amount of first oxygen consumed for the degradation of carbon-containing organic matter in the biochemical subsystem.

[0007] According to the present invention, an oxygen precision control system includes multiple ammonia nitrogen monitors, which are respectively installed in the inlet pipe and the outlet. The ammonia nitrogen monitors are used to monitor the amount of ammonia nitrogen generated during the nitrification process in the biochemical subsystem.

[0008] According to the oxygen precision control system provided by this utility model, the plurality of monitoring instruments further include: a plurality of total nitrogen monitoring instruments and a nitrate monitoring instrument, wherein the plurality of total nitrogen monitoring instruments are respectively installed in the inlet pipe and the outlet, and the nitrate monitoring instrument is installed in the outlet; the total nitrogen monitoring instrument and the nitrate monitoring instrument are used to monitor the amount of nitrogen removed during the denitrification process of the biochemical subsystem.

[0009] According to the present invention, an oxygen precision control system further includes a controller, which is used to calculate the second amount of oxygen consumed in the nitrification process based on the ammonia nitrogen content, calculate the third amount of oxygen released during the denitrification process based on the nitrogen removal content, and calculate the fourth amount of oxygen carried away when discharging the residual sludge based on the residual sludge discharge content; the controller is also used to calculate the total oxygen demand based on the first amount of oxygen, the second amount of oxygen, the third amount of oxygen, and the fourth amount of oxygen, and adjust the speed of the blower assembly based on the total oxygen demand.

[0010] The oxygen precision control system provided by this utility model further includes a second flow meter, which is installed in the water inlet pipeline and is used to monitor the amount of wastewater being treated.

[0011] According to the present invention, an oxygen precision control system includes a blower assembly comprising a blower and a frequency converter, wherein the frequency converter is electrically connected to the blower, the blower is used to blow air into the biochemical subsystem, and the speed of the blower can be adjusted by adjusting the frequency of the frequency converter.

[0012] According to the present invention, an oxygen precision control system further includes a third flow meter. The blower has an air outlet pipe that extends into the biochemical subsystem, and the third flow meter is disposed in the air outlet pipe.

[0013] According to the present invention, an oxygen precision control system includes a biochemical subsystem comprising a biochemical tank and a secondary sedimentation tank, wherein the inlet pipeline is connected to the biochemical tank and the secondary sedimentation tank.

[0014] According to the present invention, a precision oxygen control system further includes a second chemical oxygen demand (COD) monitor and a dissolved oxygen (DO) monitor; the secondary sedimentation tank is connected to an outlet pipe, the outlet pipe is equipped with the second COD monitor, and the outlet of the biochemical tank is equipped with the dissolved oxygen monitor.

[0015] The oxygen precision control system provided by this utility model, by setting up multiple monitoring instruments, a first flow meter, and a blower assembly, can monitor the wastewater quality in the biochemical subsystem in real time and calculate the actual total oxygen demand. Based on the total oxygen demand, the aeration rate of the blower assembly is calculated. By precisely controlling the speed of the blower assembly, the aeration rate can be accurately controlled, thus achieving precise oxygen control. At the same time, based on the changes in oxygen consumption caused by changes in the influent water quality and quantity, the aeration rate of the blower assembly can be adjusted in real time, reducing the energy consumption of wastewater treatment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the oxygen precision control system provided by this utility model.

[0018] Figure label:

[0019] 10. Biological treatment tank; 11. Secondary sedimentation tank; 12. Aeration head; 20. Inlet pipe; 21. Outlet pipe; 31. First chemical oxygen demand (COD) monitor; 32. Total nitrogen monitor; 33. Ammonia nitrogen monitor; 34. Nitrate monitor; 35. Dissolved oxygen monitor; 36. Second COD monitor; 41. First flow meter; 42. Second flow meter; 43. Third flow meter; 51. Blower; 52. Frequency converter; 60. Controller. Detailed Implementation

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

[0021] The following is combined Figure 1 This invention describes a precision oxygen control system.

[0022] like Figure 1 As shown in the embodiment of this utility model, the oxygen precision control system includes: a biochemical subsystem, multiple monitoring instruments, a first flow meter 41, and a blower assembly. The biochemical subsystem is connected to an inlet pipe 20. Multiple monitoring instruments are installed at the inlet pipe 20 and the outlet of the biochemical subsystem. These instruments monitor the amount of first oxygen consumed for the degradation of carbonaceous organic matter within the biochemical subsystem, the amount of ammonia nitrogen produced during nitrification, and the amount of nitrogen removed during denitrification. The first flow meter 41 is installed on the sewage discharge pipe of the biochemical subsystem and is used to monitor the amount of residual sludge discharged.

[0023] Specifically, based on the ammonia nitrogen level monitored by the monitoring instrument, the amount of second oxygen required for the nitrification process in the biochemical subsystem can be calculated; based on the amount of denitrification monitored by the monitoring instrument, the amount of third oxygen released during the denitrification process in the biochemical subsystem can be calculated; and based on the amount of residual sludge discharged, the amount of fourth oxygen carried away when discharging residual sludge can be calculated.

[0024] Therefore, the total oxygen demand of the biochemical subsystem = first oxygen demand + second oxygen demand - third oxygen demand - fourth oxygen demand. Based on this formula, the total oxygen demand of the biochemical subsystem can be accurately calculated. The blower assembly is located outside the biochemical subsystem and is used to provide air to the subsystem for aeration. The aeration rate of the biochemical subsystem can be adjusted by regulating the speed of the blower assembly. Specifically, the total oxygen demand is converted into the aeration rate of the blower assembly. By adjusting the speed of the blower assembly, the aeration rate can be adjusted to achieve on-demand aeration and reduce power consumption.

[0025] The oxygen precision control system provided in this embodiment of the invention, by setting up multiple monitoring instruments, a first flow meter, and a blower assembly, can monitor the wastewater quality in the biochemical subsystem in real time and calculate the actual total oxygen demand. Based on the total oxygen demand, the aeration rate of the blower assembly is calculated. By precisely controlling the speed of the blower assembly, the aeration rate can be accurately controlled, thus achieving precise oxygen control. At the same time, based on the changes in oxygen consumption caused by changes in the influent water quality and quantity, the aeration rate of the blower assembly can be adjusted in real time, reducing the energy consumption of wastewater treatment.

[0026] like Figure 1 As shown in the embodiment of this utility model, the biochemical subsystem includes a biochemical tank 10 and a secondary sedimentation tank 11. The biochemical tank 10 is equipped with multiple aeration heads 12, and a blower assembly is used to provide air to the biochemical tank 10. An inlet pipe 20 connects to the biochemical tank 10 and the secondary sedimentation tank 11. Wastewater enters the biochemical tank 10 through the inlet pipe 20 to undergo a biochemical reaction to remove pollutants from the wastewater. The secondary sedimentation tank 11 is used to separate sludge from water in the wastewater.

[0027] like Figure 1 As shown in the embodiment of this utility model, the multiple monitoring instruments include: a first chemical oxygen demand (COD) monitor 31, multiple total nitrogen (TN) monitors 32, multiple ammonia nitrogen (AM) monitors 33, and a nitrate monitor 34. The COD monitor 31, AM monitor 32, and AM monitor 33 are installed on the inlet pipe 20, and the AM monitor 32, AM monitor 33, and nitrate monitor 34 are installed at the outlet of the biological treatment tank 10. The first COD monitor 31 is used to monitor the first amount of oxygen consumed for the degradation of carbonaceous organic matter in the biological treatment tank 10; the multiple AM ​​monitors 33 are used to monitor the amount of ammonia nitrogen generated during nitrification in the biological treatment tank 10, and calculate the second amount of oxygen consumed during nitrification based on the ammonia nitrogen amount; the multiple AM ​​monitors 32 and nitrate monitor 34 are used to monitor the amount of nitrogen released during denitrification in the biological treatment tank 10, and calculate the third amount of oxygen released during denitrification based on this nitrogen amount.

[0028] The first flow meter 41 is installed on the sewage discharge pipe of the secondary sedimentation tank 11. It calculates the nitrogen content and carbonaceous organic matter content in the biochemical sludge discharged with the excess sludge to obtain the oxygen consumption carried away by the discharged excess sludge, i.e., the fourth oxygen consumption. It should be noted that the nitrogen and carbonaceous organic matter in the sludge do not consume oxygen when discharging the excess sludge.

[0029] like Figure 1 In an embodiment of this invention, the oxygen precision control system further includes a controller 60. The controller 60 is used to calculate the second amount of oxygen consumed during nitrification based on the ammonia nitrogen content, the third amount of oxygen released during denitrification based on the nitrogen removal rate, and the fourth amount of oxygen carried away during the discharge of excess sludge based on the sludge discharge rate. The controller 60 is also used to calculate the total oxygen demand based on the first, second, third, and fourth oxygen contents, and to adjust the speed of the blower assembly based on the total oxygen demand.

[0030] Specifically, the formula for calculating the total oxygen demand can be set in the controller 60. At the same time, a database of the correspondence between the total oxygen demand and the speed of the blower assembly can be established in the controller 60. The controller 60 calculates the second oxygen demand based on the received ammonia nitrogen amount; calculates the third oxygen demand based on the received denitrification amount; calculates the fourth oxygen demand based on the amount of residual sludge discharged; then calculates the total oxygen demand according to the formula for the total oxygen demand, and retrieves the speed of the blower assembly corresponding to the total oxygen demand from the database, and controls the rotation of the blower assembly based on the speed.

[0031] It should be noted that the calculation of the second, third, and fourth oxygen quantities can also be performed by the operator, and the speed of the blower assembly can also be manually adjusted by the operator. The operator calculates the total oxygen demand according to the formula, and based on the correspondence between this total oxygen demand and the speed of the blower assembly, adjusts the speed of the blower assembly to achieve on-demand aeration and precise oxygen control.

[0032] like Figure 1 As shown in the embodiment of this utility model, the oxygen precision control system further includes a second flow meter 42, which is installed on the inlet pipe 20 of the biochemical tank 10 and is used to monitor the amount of wastewater being treated.

[0033] like Figure 1 As shown, in an embodiment of this utility model, the blower assembly includes a blower 51 and a frequency converter 52. The frequency converter 52 is electrically connected to the blower 51. The blower 51 is used to blow air into the biological treatment tank 10 to achieve aeration. The speed of the blower 51 can be adjusted by adjusting the frequency converter 52.

[0034] Furthermore, the blower 51 has an air outlet duct 21 that extends into the biological treatment tank 10. The oxygen precision control system also includes a third flow meter 43, which is installed in the air outlet duct 21. The third flow meter 43 is used to monitor the aeration rate.

[0035] like Figure 1 As shown in the embodiment of this utility model, the oxygen precision control system further includes: a dissolved oxygen monitor 35 and a second chemical oxygen demand (COD) monitor 36. A dissolved oxygen monitor 35 is installed at the effluent outlet of the biological treatment tank 10 to monitor the dissolved oxygen content during the biological treatment process. The secondary sedimentation tank 11 is connected to an effluent pipeline, and a second COD monitor 36 is installed on the effluent pipeline to monitor the oxygen required for the degradation of carbonaceous organic matter during the biological treatment process, thereby assessing the degradation effect.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A precision oxygen control system, characterized in that, include: The system includes a biochemical subsystem, multiple monitoring instruments, a first flow meter, and a blower assembly, wherein the biochemical subsystem is connected to an inlet pipe. Multiple monitoring instruments are installed in the inlet pipe and at the outlet of the biochemical subsystem. The multiple monitoring instruments are used to monitor the amount of first oxygen consumed for the degradation of carbon-containing organic matter in the biochemical subsystem, the amount of ammonia nitrogen produced during the nitrification process in the biochemical subsystem, and the amount of nitrogen removed during the denitrification process in the biochemical subsystem. The first flow meter is installed on the sewage discharge pipeline of the biochemical subsystem, and the first flow meter is used to monitor the amount of residual sludge discharged; The blower assembly is located outside the biochemical subsystem, and adjusting the speed of the blower assembly can regulate the aeration rate of the biochemical subsystem.

2. The oxygen precision control system according to claim 1, characterized in that, The plurality of monitoring instruments include a first chemical oxygen demand (COD) monitor, which is installed in the water inlet pipeline and is used to monitor the amount of oxygen consumed for the degradation of carbon-containing organic matter in the biochemical subsystem.

3. The oxygen precision control system according to claim 1, characterized in that, The plurality of monitoring instruments also include a plurality of ammonia nitrogen monitoring instruments, which are respectively installed in the inlet pipe and the outlet. The ammonia nitrogen monitoring instruments are used to monitor the amount of ammonia nitrogen generated during the nitrification process in the biochemical subsystem.

4. The oxygen precision control system according to claim 1, characterized in that, The plurality of monitoring instruments further include: a plurality of total nitrogen monitoring instruments and a nitrate monitoring instrument, wherein the plurality of total nitrogen monitoring instruments are respectively installed in the inlet pipe and the outlet, and the nitrate monitoring instrument is installed in the outlet; The total nitrogen monitor and the nitrate monitor are used to monitor the amount of nitrogen removed during the denitrification process of the biochemical subsystem.

5. The oxygen precision control system according to any one of claims 1-4, characterized in that, It also includes a controller, which is used to calculate the second amount of oxygen consumed in the nitrification process based on the ammonia nitrogen content, to calculate the third amount of oxygen released during the denitrification process based on the nitrogen removal content, and to calculate the fourth amount of oxygen carried away when discharging the excess sludge based on the excess sludge discharge content. The controller is also used to calculate the total oxygen demand based on the first oxygen quantity, the second oxygen quantity, the third oxygen quantity, and the fourth oxygen quantity, and to adjust the speed of the blower assembly based on the total oxygen demand.

6. The oxygen precision control system according to claim 1, characterized in that, It also includes a second flow meter, which is installed in the inlet pipe and is used to monitor the amount of wastewater being treated.

7. The oxygen precision control system according to claim 1, characterized in that, The blower assembly includes a blower and a frequency converter. The frequency converter is electrically connected to the blower. The blower is used to blow air into the biochemical subsystem. Adjusting the frequency of the frequency converter can adjust the speed of the blower.

8. The oxygen precision control system according to claim 7, characterized in that, It also includes a third flow meter, the blower has an air outlet duct that extends into the biochemical subsystem, and the third flow meter is installed in the air outlet duct.

9. The oxygen precision control system according to claim 1, characterized in that, The biochemical subsystem includes a biochemical tank and a secondary sedimentation tank, and the inlet pipeline is connected to the biochemical tank and the secondary sedimentation tank.

10. The oxygen precision control system according to claim 9, characterized in that, It also includes a second chemical oxygen demand (COD) monitor and a dissolved oxygen (DO) monitor; The secondary sedimentation tank is connected to an outlet pipeline, and a second chemical oxygen demand (COD) monitor is installed on the outlet pipeline. The dissolved oxygen (DO) monitor is installed at the outlet of the biological treatment tank.

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