Automatic carbon source adding system for sewage treatment plant

Abstract

The utility model discloses an automatic carbon source feeding system for a sewage treatment plant, which comprises a carbon source feeding device and a control device, and an input end group of the control device is connected with a water inlet flowmeter, a water inlet total nitrogen detector and a water outlet total nitrogen detector. The sensing end of the water inlet flow meter and the sensing end of the water inlet total nitrogen detector are both arranged in the sewage inlet header pipe, the sensing end of the water outlet total nitrogen detector is arranged in the sewage outlet header pipe, and the control end of the carbon source adding device is electrically connected with the control signal output end set of the control device. And the carbon source output end of the carbon source adding device is communicated with the anoxic tank. Whether the external carbon source needs to be added or not to enable the total nitrogen of the effluent to reach the standard is judged according to the water inlet amount and the total nitrogen content of sewage treatment, the carbon source is accurately added according to requirements, accurate adding of the carbon source agent is achieved, and the carbon source agent consumption needed for removing unit TN is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, and specifically designs an automatic carbon source dosing system for a sewage treatment plant. Background Art

[0002] In the field of sewage treatment, for sewage with high ammonia nitrogen and low C / N, in order to achieve the standards for nitrogen pollutants such as ammonia nitrogen and total nitrogen in the effluent, the conventional biochemical denitrification process is the nitrification and denitrification process. The low C / N ratio of sewage leads to incomplete denitrification reaction, and an external carbon source is required to ensure that the total nitrogen in the effluent meets the standards.

[0003] Among the existing carbon source addition methods, sewage treatment plants currently mainly use quantitative addition, empirical addition, or simple automatic addition equipment for addition. The C / N ratio of the influent water from sewage treatment plants fluctuates greatly. In order to ensure that the effluent quality meets the standards, the dosage is usually adjusted manually according to the treatment effect. Due to the untimely adjustment of water quality and water quantity fluctuations, TN exceeds the standard or the dosage is too large, which on the one hand causes waste of reagents and increased operating costs, and on the other hand, excessive carbon sources cause the effluent to be at risk of not meeting the standards. Utility Model Content

[0004] The utility model provides an automatic carbon source dosing system for a sewage treatment plant, which can solve the problem in the prior art that the carbon source dosing amount control accuracy is poor and the efficient and stable operation of the sewage treatment plant cannot be guaranteed.

[0005] A carbon source automatic dosing system for a sewage treatment plant, comprising a carbon source dosing device and a control device, wherein an inlet flow meter, an inlet total nitrogen detector, and an outlet total nitrogen detector are connected to the input end group of the control device, the inlet flow meter and the inlet total nitrogen detector are both arranged in a sewage inlet main pipe, the inlet total nitrogen detector is arranged in a sewage outlet main pipe, the control end of the carbon source dosing device is electrically connected to a control signal output end group of the control device, and the carbon source output end of the carbon source dosing device is connected to an anoxic tank;

[0006] The carbon source dosing device includes a first mixing tank and a second mixing tank of the same structure, wherein the first mixing tank includes a tank body, a mixing motor, a mixing shaft and a mixing paddle, a feed port is provided at the top of the tank body, the mixing motor is fixed to the center of the top of the tank body through a mounting assembly, the mixing shaft is arranged in the tank body and connected to the output shaft of the mixing motor, limited bearings are arranged between the upper and lower ends of the mixing shaft and the tank body, the mixing paddle is arranged on the mixing shaft, and a filter assembly is also arranged on the mixing shaft below the mixing paddle, the edge of the filter assembly is fixedly connected to the inner wall of the tank body, a liquid outlet pipe is passed through and fixed at the lower part of the tank body, and the inlet of the liquid outlet pipe extends into a liquid collecting tank opened at the bottom of the tank body.

[0007] Furthermore, the top of the tank body is connected to a water inlet pipe for connecting to a tap water supply system.

[0008] Furthermore, the carbon source dosing device also includes a first solenoid valve, a first metering pump, a second solenoid valve, a second metering pump, an electric three-way valve, and a carbon source flowmeter. The liquid outlet pipeline of the first mixing tank is connected via the first solenoid valve, the first metering pump, and an inlet of the electric three-way valve. The liquid outlet pipeline of the second mixing tank is connected via the second solenoid valve, the second metering pump, and another inlet of the electric three-way valve. The outlet of the electric three-way valve is connected to the anoxic tank via the carbon source flowmeter.

[0009] Furthermore, the filter assembly includes a bearing sleeve rotatably matched with the mixing shaft, and a first filter screen and a second filter screen are installed on the bearing sleeve. The second filter screen is connected to the bottom of the first filter screen through a supporting frame, and the aperture of the second filter screen is smaller than that of the first filter screen.

[0010] Furthermore, a sealing cover is provided on the feed port, the sealing cover is hinged to the tank body, and a handle is arranged on the top of the sealing cover.

[0011] Furthermore, the system also includes a pre-anoxic tank, an anaerobic tank and an aerobic tank, the pre-anoxic tank, the anaerobic tank, the anoxic tank and the aerobic tank are connected in sequence, the water inlet of the pre-anoxic tank is connected to the sewage inlet main pipe, a first stop valve is arranged between the anoxic tank and the aerobic tank, and the water outlet of the aerobic tank is connected to the sewage outlet main pipe.

[0012] Furthermore, the aerobic pool is also connected to the anoxic pool through a reflux pipe, and a second stop valve and a reflux pump are provided on the reflux pipe.

[0013] Furthermore, the control device includes a controller and a display module and a communication module connected to the controller. The signal input terminal group of the controller is electrically connected to the water inlet flow meter, the water inlet total nitrogen detector, and the water outlet total nitrogen detector. The output terminal of the controller is electrically connected to the control terminal of the carbon source dosing device through a frequency converter. The controller is interconnected with the remote control terminal through the communication module.

[0014] Beneficial effects:

[0015] 1. Feedforward detection is formed through the inlet flow meter and the inlet total nitrogen detector, and feedback detection is formed through the effluent total nitrogen detector, so as to judge whether it is necessary to add an external carbon source to make the effluent total nitrogen (TN) meet the standard according to the sewage treatment inlet water volume and total nitrogen content, and accurately add the carbon source according to the demand, so as to achieve accurate addition of carbon source reagents, reduce the consumption of carbon source reagents required to remove unit TN, avoid the occurrence of TN exceeding the standard or excessive dosage caused by untimely adjustment of water quality and water volume fluctuations, reduce the operating cost of the sewage plant, and avoid the risk of effluent not meeting the standard;

[0016] 2. The mixing tank of the carbon source dosing device can stir the carbon source to fully dissolve it in the water, so that the carbon source can be evenly distributed after addition, thereby improving the utilization rate of the carbon source.

[0017] 3. By setting a liquid collecting tank at the bottom of the tank and extending the inlet of the liquid outlet pipe into the liquid collecting tank, not only can all the carbon sources inside the tank be better extracted, but the carbon sources at the bottom of the tank can also be effectively stirred and mixed, so that the carbon sources are dispersed more fully.

[0018] 4. The condensed carbon source can be filtered out through the first filter and the second filter to prevent the undissolved carbon source from clogging the pipeline and the metering pump after condensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a pipeline structure diagram of the utility model;

[0020] Figure 2 This is the piping structure diagram of the carbon source dosing device;

[0021] Figure 3 It is a schematic structural diagram of the first mixing tank. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with embodiments and drawings.

[0023] like Figure 1As shown, a carbon source automatic dosing system for a sewage treatment plant comprises a pre-anoxic tank 2, an anaerobic tank 3, an aerobic tank 5, a carbon source dosing device 7 and a control device 8, wherein the pre-anoxic tank 2, the anaerobic tank 3, the anoxic tank 4 and the aerobic tank 5 are arranged in sequence from high to low and are connected in sequence through pipelines, the sewage inlet main pipe 1 is connected to the water inlet of the pre-anoxic tank 2, a first stop valve 14 is arranged on the pipeline between the anoxic tank 4 and the aerobic tank 5, the sewage outlet main pipe 6 is connected to the water outlet of the aerobic tank 5, an inlet flowmeter 9, an inlet total nitrogen detector 10 and an outlet total nitrogen detector 13 are connected to the input end group of the control device 8, and the The sensing ends of the inlet flowmeter 9 and the inlet total nitrogen detector 10 are both arranged in the sewage inlet main pipe 1, the sensing end of the outlet total nitrogen detector 13 is arranged in the sewage outlet main pipe 6, the control end of the carbon source dosing device 7 is electrically connected to the control signal output end group of the control device 8, and the carbon source output end of the carbon source dosing device 7 is connected to the anoxic tank 4; the aerobic tank 5 is also connected to the anoxic tank 4 through a reflux pipe 15, and a second stop valve 17 and a reflux pump 16 are arranged on the reflux pipe 15, and the first stop valve 14, the second stop valve 17 and the reflux pump 16 are also connected to the control signal output end group of the control device 8.

[0024] When in use, feedforward detection is formed by the inlet flowmeter 9 and the inlet total nitrogen detector 10, and feedback detection is formed by the outlet total nitrogen detector 13, so as to judge whether it is necessary to add an external carbon source to make the outlet total nitrogen (TN) meet the standard according to the inlet water volume of the sewage treatment and the total nitrogen content of the inlet and outlet water, and control the carbon source dosing device 7 to accurately add the carbon source according to the demand, so as to achieve accurate addition of the carbon source agent and reduce the carbon source agent consumption required to remove the unit TN. When the outlet total nitrogen detector 13 detects that the outlet total nitrogen does not meet the standard, the control device 8 controls the first stop valve 14 to cut off the anoxic tank 4 and the aerobic tank 5, and opens the second stop valve 17 and the reflux pump 16, so that the sewage in the aerobic tank 5 is refluxed to the anoxic tank 4 through the reflux pipe 15 for secondary treatment, so as to ensure that the outlet water quality meets the standard.

[0025] from Figure 1It can also be seen that the control device 8 includes a controller 81 and a display module 82 and a communication module 83 connected to the controller 81. The signal input terminal group of the controller 81 is electrically connected to the water inlet flowmeter 9, the water inlet total nitrogen detector 10, and the water outlet total nitrogen detector 13. The output end of the controller 81 is electrically connected to the control end of the carbon source dosing device 7 through the frequency converter 11 to realize the frequency conversion control of the carbon source dosing device 7. The display module is used to display various parameters in the operation of the system. The controller 81 communicates and interconnects with the remote control terminal 12 through the communication module 83. The remote control terminal 12 can be a handheld mobile terminal and / or an industrial computer, so that it can not only realize remote control and remote reminder, but also remote backup of data, which is helpful for later maintenance.

[0026] like Figure 2 As shown, the carbon source dosing device 7 includes a first mixing tank 71 and a second mixing tank 72 with the same structure, and also includes a first solenoid valve 73, a first metering pump 74, a second solenoid valve 76, a second metering pump 77, an electric three-way valve 78, and a carbon source flow meter 75. The liquid outlet pipe 717 of the first mixing tank 71 is connected through the first solenoid valve 73, the first metering pump 74 and an inlet of the electric three-way valve 78, and the liquid outlet pipe 717 of the second mixing tank 72 is connected through the second solenoid valve 76, the second metering pump 77 and another inlet of the electric three-way valve 78. The outlet of the electric three-way valve 78 is connected to the anoxic tank 4 through the carbon source flow meter 75, and a liquid level meter 79 is also provided on the first mixing tank 71 and the second mixing tank 72.

[0027] When in use, the carbon source flow meter 75 and the liquid level meter 79 are connected to the signal input terminal group of the control device 8, and the first solenoid valve 73, the first metering pump 74, the second solenoid valve 76, the second metering pump 77, and the electric three-way valve 78 are connected to the control signal output terminal group of the control device 8. Through the above-mentioned carbon source dosing device 7, not only can the carbon source be accurately added according to the control signal of the control device 8, but also the electric three-way valve 78 can be controlled according to the detected liquid level signal of the carbon source in the first mixing tank 71 and the second mixing tank 72, so as to realize the alternating mixing of the first mixing tank 71 and the second mixing tank 72 and then the addition of the carbon source, thereby ensuring the continuous carbon source addition of the system and ensuring the efficient and continuous operation of the sewage treatment plant.

[0028] In this embodiment, the structure of the first mixing tank 71 is as follows: Figure 3As shown, it includes a tank body 711, a mixing motor 712, a mixing shaft 713 and a mixing paddle 714. A feed inlet 715 is opened at the top of the tank body 711. The mixing motor 712 is fixed to the center of the top of the tank body 711 through a mounting assembly 718. The mixing shaft 713 is arranged in the tank body 711 and connected to the output shaft of the mixing motor 712. Limit bearings 719 are arranged between the upper and lower ends of the mixing shaft 713 and the tank body 711. The mixing paddle 714 is arranged on the mixing shaft 713. A filtering assembly is also arranged on the mixing shaft 713 below the mixing paddle 714. The edge of the filtering assembly is fixedly connected to the inner wall of the tank body 711. A liquid outlet pipe 717 is passed through and fixed at the lower part of the tank body 711. The inlet of the liquid outlet pipe 717 extends into a liquid collecting tank 716 opened at the bottom of the tank body 711.

[0029] Based on the above structure, the first mixing tank 71 and the second mixing tank 72 of the carbon source dosing device 7 can stir the carbon source to fully dissolve it in the water, so that the carbon source can be evenly distributed after being added, thereby improving the utilization rate of the carbon source. In addition, by setting a collecting tank 716 at the bottom of the tank body and extending the inlet of the liquid outlet pipe 717 into the collecting tank 716, not only can all the carbon sources inside the tank body be better extracted, but also the carbon source at the bottom of the tank body can be effectively stirred and mixed, so that the carbon source is more fully dispersed.

[0030] In this example, the top of the tank body 711 is connected to a water inlet pipe 720 for connecting to a tap water supply system, and a tap water flow meter can be set on the water inlet pipe 720 to achieve dilution and mixing of a carbon source of known concentration by adding an appropriate amount of tap water to a carbon source of desired concentration.

[0031] Preferably, the filter assembly includes a bearing sleeve rotatably matched with the mixing shaft 713, and a first filter screen 7110 and a second filter screen 7112 are mounted on the bearing sleeve, the second filter screen 7112 is connected to the lower part of the first filter screen 7110 through a support frame 7111, and the aperture of the second filter screen 7112 is smaller than that of the first filter screen 7110. The condensed carbon source can be filtered out through the first filter screen and the second filter screen to prevent the undissolved carbon source from clogging the pipeline and the metering pump after condensation.

[0032] In this example, the mixing paddle 714 includes multiple cross bars vertically connected to the mixing shaft 713, and the multiple cross bars are connected by vertical bars at the far ends. Such a structure enables the mixing paddle 714 to fully stir and mix the carbon source in the tank body, and also ensure the structural strength of the mixing paddle 714, thereby extending the service life of the device.

[0033] In order to prevent garbage and debris from contaminating the carbon source, a sealing cover 721 is covered on the feed port 715 . The sealing cover 721 is hinged to the tank body 711 , and a handle 722 is disposed on the top of the sealing cover 721 .

[0034] Working principle:

[0035] In this embodiment, feedforward detection is formed by the inlet flow meter 9 and the inlet total nitrogen detector 10, and feedback detection is formed by the effluent total nitrogen detector 13, so as to judge whether it is necessary to add an external carbon source to make the effluent total nitrogen (TN) meet the standard according to the inlet water volume and the total nitrogen content of the sewage treatment, and accurately add the carbon source according to the demand, so as to achieve accurate addition of the carbon source agent, reduce the carbon source agent consumption required to remove unit TN, avoid the occurrence of TN exceeding the standard or excessive dosage due to untimely adjustment of water quality and water quantity fluctuations, reduce the operating cost of the sewage treatment plant, and avoid the risk of effluent not meeting the standard.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make a variety of similar expressions without violating the purpose and claims of the present invention, and such changes fall within the scope of protection of the present invention.

Claims

1. A carbon source automatic dosing system for a sewage treatment plant, comprising a carbon source dosing device (7) and a control device (8), characterized in that: An inlet flow meter (9), an inlet total nitrogen detector (10), and an outlet total nitrogen detector (13) are connected to the input end group of the control device (8); the sensing ends of the inlet flow meter (9) and the inlet total nitrogen detector (10) are both arranged in the sewage inlet main pipe (1); the sensing end of the outlet total nitrogen detector (13) is arranged in the sewage outlet main pipe (6); the control end of the carbon source dosing device (7) is electrically connected to the control signal output end group of the control device (8); and the carbon source output end of the carbon source dosing device (7) is connected to the anoxic tank (4); The carbon source dosing device (7) comprises a first mixing tank (71) and a second mixing tank (72) of the same structure, wherein the first mixing tank (71) comprises a tank body (711), a mixing motor (712), a mixing shaft (713) and a mixing paddle (714), a feed inlet (715) is provided at the top of the tank body (711), the mixing motor (712) is fixed to the center of the top of the tank body (711) through a mounting assembly (718), and the mixing shaft (713) is arranged in the tank body (711) and is connected to the output shaft of the mixing motor (712). The mixing shaft (713) is connected to the tank body (711), and limit bearings (719) are arranged between the upper and lower ends of the mixing shaft (713) and the tank body (711). The mixing paddle (714) is arranged on the mixing shaft (713). A filter assembly is also arranged on the mixing shaft (713) below the mixing paddle (714), and the edge of the filter assembly is fixedly connected to the inner wall of the tank body (711). A liquid outlet pipe (717) is fixedly arranged at the lower part of the tank body (711), and the inlet of the liquid outlet pipe (717) extends into a liquid collecting tank (716) opened at the bottom of the tank body (711).

2. The automatic carbon source dosing system for a sewage treatment plant according to claim 1, characterized in that: The top of the tank body (711) is connected to a water inlet pipe (720) for connecting to a tap water supply system.

3. The automatic carbon source dosing system for a sewage treatment plant according to claim 1, characterized in that: The carbon source dosing device (7) further comprises a first electromagnetic valve (73), a first metering pump (74), a second electromagnetic valve (76), a second metering pump (77), an electric three-way valve (78), and a carbon source flow meter (75); the liquid outlet pipeline (717) of the first mixing tank (71) is connected via the first electromagnetic valve (73), the first metering pump (74) and an inlet of the electric three-way valve (78); the liquid outlet pipeline (717) of the second mixing tank (72) is connected via the second electromagnetic valve (76), the second metering pump (77) and another inlet of the electric three-way valve (78); and the outlet of the electric three-way valve (78) is connected via the carbon source flow meter (75) and the anoxic tank (4).

4. The automatic carbon source dosing system for a sewage treatment plant according to claim 1, characterized in that: The filtering assembly includes a bearing sleeve rotatably matched with the mixing shaft (713), and a first filter screen (7110) and a second filter screen (7112) are installed on the bearing sleeve. The second filter screen (7112) is connected to the bottom of the first filter screen (7110) through a supporting frame (7111), and the aperture of the second filter screen (7112) is smaller than that of the first filter screen (7110).

5. The automatic carbon source dosing system for a sewage treatment plant according to claim 1, characterized in that: The feed port (715) is covered with a sealing cover (721), which is hinged to the tank body (711), and a handle (722) is arranged on the top of the sealing cover (721).

6. The automatic carbon source dosing system for a sewage treatment plant according to any one of claims 1 to 5, characterized in that: The system further comprises a pre-anoxic tank (2), an anaerobic tank (3) and an aerobic tank (5); the pre-anoxic tank (2), the anaerobic tank (3), the anoxic tank (4) and the aerobic tank (5) are connected in sequence; the water inlet of the pre-anoxic tank (2) is connected to the sewage inlet main pipe (1); a first stop valve (14) is provided between the anoxic tank (4) and the aerobic tank (5); and the water outlet of the aerobic tank (5) is connected to the sewage outlet main pipe (6).

7. The automatic carbon source dosing system for a sewage treatment plant according to claim 6, characterized in that: The aerobic pool (5) is also connected to the anoxic pool (4) via a reflux pipe (15), and a second stop valve (17) and a reflux pump (16) are provided on the reflux pipe (15).

8. The automatic carbon source dosing system for a sewage treatment plant according to any one of claims 1 to 5, characterized in that: The control device (8) comprises a controller (81), a display module (82) and a communication module (83) connected to the controller (81); a signal input terminal group of the controller (81) is electrically connected to the water inlet flow meter (9), the water inlet total nitrogen detector (10), and the water outlet total nitrogen detector (13); an output terminal of the controller (81) is electrically connected to a control terminal of the carbon source dosing device (7) via a frequency converter (11); and the controller (81) is interconnected and communicated with a remote control terminal (12) via the communication module (83).

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