A sewage treatment system and control method

Abstract

The present application relates to sewage treatment technical field, provide a kind of sewage treatment system and control method, the system includes equipment module, detection module and control module;Equipment module includes electrolytic dephosphorization device and the water inlet pool, anoxic tank, aerobic tank, sedimentation tank / filter tank and water outlet pool sequentially arranged;Detection module includes the first total phosphorus detector of being arranged in water inlet pool, and the second total phosphorus detector of being arranged in water outlet pool;Control module includes controller and database;Wherein, the water outlet of electrolytic dephosphorization device is connected to aerobic tank or between anoxic tank and aerobic tank, the water inlet of electrolytic dephosphorization device is connected with sedimentation tank or filter tank by pumping device;Controller is connected with the first total phosphorus detector, second total phosphorus detector, electrolytic dephosphorization device and pumping device;Several preset control parameters are pre-stored in database.The system can intelligent, automation adjust control parameter and adapt to different types of sewage treatment working condition, and phosphorus removal treatment efficiency is high, effect is good, and operating cost is low.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and specifically to a wastewater treatment system and control method. Background Technology

[0002] Electrolytic phosphorus removal for wastewater treatment involves applying an electric field between electrodes to electrolyze iron, producing ferrous ions that react with PO4 in the wastewater. 3+ The reaction produces stable ferric phosphate and ferric hydroxide precipitates, which are then removed through solid-liquid separation, thus achieving phosphorus removal. Generally, the higher the voltage and current, the more iron ions are released, resulting in better phosphorus removal. In existing wastewater treatment systems, to ensure phosphorus removal meets standards, high operating parameters are typically used during the treatment process. This approach suffers from high energy consumption; furthermore, existing wastewater treatment systems are applicable to relatively limited conditions, requiring repeated adjustments of operating parameters to meet treatment requirements for different types of wastewater. They also exhibit low levels of automation, inconvenience, low treatment efficiency, and high costs. Summary of the Invention

[0003] To address the aforementioned problems in the prior art, this invention provides a wastewater treatment system and control method. This system and method can match corresponding preset control parameters according to the total phosphorus concentration of the influent, achieving intelligent and automated adjustment of control parameters and adapting to different types of wastewater treatment conditions. It has high treatment efficiency, good treatment effect, and low operating cost. Furthermore, the electrolytic phosphorus removal device uses the supernatant from the sedimentation tank as the medium for electrolysis. The electrolysis reaction takes place in an independent space. Electrolyzed iron ions enter the aerobic tank with the water flow and fully mix with phosphate ions to generate iron phosphate and iron hydroxide precipitates. The electrolysis reaction is not affected by aeration and sludge, and the release of iron ions is stable and the utilization rate is high, resulting in a more complete and efficient phosphorus removal reaction.

[0004] The technical solution adopted in this invention is as follows:

[0005] A wastewater treatment system includes an equipment module, a detection module, and a control module;

[0006] The equipment module includes an electrolytic phosphorus removal device and an inlet pool, an anoxic pool, an aerobic pool, a sedimentation / filter pool, and an outlet pool arranged in sequence.

[0007] The detection module includes a first total phosphorus detector disposed in the inlet pool and a second total phosphorus detector disposed in the outlet pool;

[0008] The control module includes a controller and a database connected together;

[0009] in,

[0010] The outlet of the electrolytic phosphorus removal device is connected to the aerobic tank or between the anoxic tank and the aerobic tank. The inlet of the electrolytic phosphorus removal device is connected to the sedimentation tank or filter tank via a pumping device. The pumping device is used to extract the supernatant in the sedimentation tank or the filtrate in the filter tank and return it to the electrolytic phosphorus removal device.

[0011] The controller is electrically connected to the first total phosphorus detector, the second total phosphorus detector, the electrolytic phosphorus removal device, and the water pumping device.

[0012] The database contains several preset control parameters.

[0013] In one embodiment of this application, the electrolytic phosphorus removal device includes:

[0014] The electrolytic phosphorus dissolution tank has an inlet at the top and an outlet at the bottom.

[0015] The electrode assembly includes multiple electrode plates, which are inserted into the electrolytic phosphorus dissolution box from top to bottom, and the multiple electrode plates are arranged in parallel and spaced apart in sequence.

[0016] An ultrasonic transmitter is located inside the electrolytic phosphorus dissolution box, on one or both sides of the plurality of electrode plates;

[0017] in,

[0018] The emitting area of ​​the ultrasonic transmitter is greater than or equal to the lateral surface area of ​​the electrode plate;

[0019] The upper part of the electrolytic phosphate dissolving tank is provided with a uniform distribution mechanism, through which the water from the inlet flows and disperses to the area around each electrode plate in the electrolytic phosphate dissolving tank.

[0020] In one embodiment of this application, the uniform distribution mechanism includes a homogenization chamber disposed on one side of the upper part of the electrolytic phosphorus dissolution tank;

[0021] The water inlet is located on the homogenizing chamber;

[0022] The homogenization chamber is connected to the electrolytic phosphorus dissolution tank through multiple water distribution holes, and the multiple water distribution holes are spaced apart from multiple electrode plates.

[0023] In one embodiment of this application, a first power supply, a second power supply, and a third power supply are respectively connected to the electrode assembly, the ultrasonic transmitter, and the pumping device; the controller is connected to the first power supply, the second power supply, and the third power supply.

[0024] in,

[0025] The first power source is a DC power source, and the controller controls the operation of the electrode assembly by controlling the voltage, current, and positive / negative switching of the first power source.

[0026] and / or, the controller controls the emission frequency and time of the ultrasonic emitter by controlling the voltage and start-stop time of the second power supply;

[0027] and / or, the water pumping device is a water pump, and the controller controls the water pump flow rate by controlling the voltage of the third power supply.

[0028] In an embodiment of the present application, the preset control parameters include the total phosphorus content of the incoming water and at least one of the first power supply voltage, the ultrasonic emitter frequency, and the water pump flow rate.

[0029] The controller selects and runs the corresponding preset control parameter according to the matching result of the detection result of the first total phosphorus detector and the total phosphorus content of the several preset control parameters.

[0030] A control method of a sewage treatment system, applicable to any of the sewage treatment systems described above, comprising the following steps:

[0031] S1, the sewage to be treated sequentially passes through the water inlet pool, the anoxic pool, the aerobic pool, the sedimentation pool / filter pool, and the water outlet pool; the first total phosphorus detector detects the total phosphorus concentration of the sewage in the water inlet pool, obtains a first detection signal and sends it to the controller, and the controller converts the first detection signal into a first detection result;

[0032] S2, compare the first detection result with the preset control parameters in the database to obtain the matched preset control parameters;

[0033] S3, the controller controls the electrolytic phosphorus removal device and / or the water pumping device according to the preset general parameters and the matched preset control parameters.

[0034] In an embodiment of the present application, it further comprises:

[0035] S4, the second total phosphorus detector detects the total phosphorus concentration of the water body in the water outlet pool, obtains a second detection signal and sends it to the controller, the controller converts the second detection signal into a second detection result, and compares the second detection result with a preset threshold value; when the second detection result is less than or equal to the preset threshold value, the control parameters of the controller for the electrolytic phosphorus removal device and the water pumping device remain unchanged; when the second detection result is greater than the preset threshold value, the control parameters of the controller for the electrolytic phosphorus removal device and the water pumping device are corrected.

[0036] In an embodiment of the present application, the preset threshold value is 0.5 mg / L.

[0037] correcting control parameters of the controller to the electrolytic dephosphorization device and the water pumping device, specifically comprising:

[0038] When the second detection result is greater than the preset threshold value by 0.1 mg / L, the control voltage of the electrode assembly in the electrolytic dephosphorization device is increased by 1-5 V, and the corrected parameters are saved to the database.

[0039] In an embodiment of the present application, the general parameters include:

[0040] The ultrasonic emitter in the electrolytic dephosphorization device is started for 3-5 min and stopped for 30-60 min every time; the positive and negative poles of the direct current power supply of the electrode assembly in the electrolytic dephosphorization device are reversed for 20-30 s each time;

[0041] and / or,

[0042] The preset control parameters include:

[0043] When the total phosphorus content of the influent is 1-3 mg / L, the direct current power supply voltage of the electrode assembly is 60-70 V, the emission frequency of the ultrasonic emitter is 32 KHz, and the water intake of the water pumping device is 50%-60% of the maximum water intake;

[0044] When the total phosphorus content of the influent is 3-5 mg / L, the direct current power supply voltage of the electrode assembly is 70-90 V, the emission frequency of the ultrasonic emitter is 32 KHz, and the water intake of the water pumping device is 60%-80% of the maximum water intake;

[0045] When the total phosphorus content of the influent is 5-6 mg / L, the direct current power supply voltage of the electrode assembly is 90-150 V, the emission frequency of the ultrasonic emitter is 28 KHz, and the water intake of the water pumping device is 80%-90% of the maximum water intake;

[0046] When the total phosphorus content of the influent is 6-8 mg / L, the direct current power supply voltage of the electrode assembly is 150-200 V, the emission frequency of the ultrasonic emitter is 28 KHz, and the water intake of the water pumping device is 90%-100% of the maximum water intake.

[0047] In an embodiment of the present application, in step S2, the first detection result is compared with the preset control parameters in the database to obtain the matched preset control parameters, specifically comprising:

[0048] The first detection result is compared with the total phosphorus content of the preset control parameters in the database, the first detection result is matched to the preset total phosphorus content range, and the preset control parameters matched with the total phosphorus content range are obtained.

[0049] Compared with the prior art, the sewage treatment system and control method have the beneficial effects that:

[0050] The sewage treatment system and control method have the beneficial effects that: BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0052] Figure 1 Fig. 1 is a structural schematic diagram of the sewage treatment system in the present application.

[0053] Figure 2 Fig. 2 is a three-dimensional structural schematic diagram of the electrolytic phosphorus removal device in the present application.

[0054] Figure 3 Fig. 3 is a connection structural schematic diagram of the electrolytic treatment device and the control module in the present application.

[0055] Figure 4 Fig. 4 is a structural schematic diagram of the electrode plate in the present application.

[0056] Figure 5 Fig. 5 is a three-dimensional structural schematic diagram of the ultrasonic wave emitter in the present application.

[0057] Figure 6 Fig. 6 is a sectional structural schematic diagram of the ultrasonic wave emitter in the present application.

[0058] Figure 7 Fig. 7 is a control method flow of the sewage treatment system in the present application. Figure 1 .

[0059] Figure 8 Fig. 8 is a control method flow of the sewage treatment system in the present application. Figure 2

[0060] REFERENCE NUMERALS:

[0061] 1. Electrolytic dephosphorization tank; 11. Water inlet; 12. Electrode assembly; 13. Homogenizing cavity;

[0062] 2. Electrode assembly; 21. Polar plate; 22. Insulating handle; 23. Copper bar; 24. Waterproof plug; 25. Conductive wire;

[0063] 3. Ultrasonic transmitter; 31. Shell; 32. Ultrasonic vibrator; 33. Power supply outlet elbow. DETAILED DESCRIPTION

[0064] Hereinafter, only certain exemplary embodiments are simply described. As can be recognized by those skilled in the art, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0065] In the description of the present application, it needs to be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0066] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0067] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection, or communication; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0068] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0069] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. For the purpose of simplifying the present application, the components and settings of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the present application.

[0070] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0071] As Figure 1 shown, the embodiment of the present application provides a sewage treatment system, which comprises a device module, a detection module and a control module.

[0072] The device module comprises an electrolytic dephosphorization device and a water inlet pool, an anoxic pool, an aerobic pool, a sedimentation pool / filter pool and a water outlet pool arranged in sequence.

[0073] The detection module comprises a first total phosphorus detector and a second total phosphorus detector, etc., the first total phosphorus detector is arranged in the water inlet pool and is used for detecting the total phosphorus concentration of the sewage to be treated at the initial time; the second total phosphorus detector is arranged in the water outlet pool and is used for detecting the total phosphorus concentration of the water body after the treatment is completed.

[0074] The control module comprises a controller and a database connected with each other, the database pre-stores a plurality of preset control parameters, can provide a plurality of operating parameter options for the controller; and the controller can correct and adjust the preset control parameters. The controller can be a PLC or a single-chip microcomputer.

[0075] The water outlet of the electrolytic dephosphorization device is connected to the aerobic pool or between the anoxic pool and the aerobic pool. That is, the electrolytic dephosphorization device can be arranged in the aerobic pool, or arranged at the outlet of the anoxic pool or the inlet of the aerobic pool, so that the iron ions and water flow discharged from the water outlet of the electrolytic dephosphorization device enter the aerobic pool to react.

[0076] The water inlet of the electrolytic dephosphorization device is connected with the sedimentation tank or filter tank through the water pumping device, and the supernatant in the sedimentation tank or the filtered liquid in the filter tank is pumped back to the electrolytic dephosphorization device by the water pumping device. That is, the supernatant with low phosphorus content in the sedimentation tank or the filtered liquid after filtration in the filter tank is used as the electrolytic water flow to stabilize the electrolytic ferric ion and fully take out the electrolytic ferric ion, so that the ferric ion fully reacts with the phosphate in the aerobic tank to generate ferric phosphate and ferric hydroxide precipitate. The electrolytic dephosphorization reaction process is not affected by aeration and sludge, and the release amount, utilization rate and dephosphorization effect of the ferric ion are ensured.

[0077] The controller is electrically connected with the first total phosphorus detector, the second total phosphorus detector, the electrolytic dephosphorization device and the water pumping device. The controller can receive the total phosphorus concentrations of the inlet and outlet water detected by the first total phosphorus detector and the second total phosphorus detector in real time, and control the operation of the electrolytic dephosphorization device and / or the water pumping device according to the detection results. The sewage treatment system can adapt to the treatment of sewage with different total phosphorus concentrations, and ensure that the treated water flow meets the discharge standard. The operation process is automatic and intelligent, and the energy consumption is low.

[0078] The sewage treatment system is provided with a device module, a detection module and a control module, and can match the corresponding preset control parameters according to the total phosphorus concentration of the inlet water, so as to realize intelligent and automatic adjustment of the control parameters and adapt to different types of sewage treatment working conditions, with high treatment efficiency, good treatment effect and low operation cost. The electrolytic dephosphorization device uses the supernatant of the sedimentation tank or the filtered liquid of the filter tank as the medium for electrolytic dephosphorization, the electrolytic reaction is carried out in an independent space, the electrolytic ferric ion enters the aerobic tank with the water flow to fully mix with the phosphate ion to generate ferric phosphate and ferric hydroxide precipitate, the electrolytic reaction is not affected by aeration and sludge, the release of the ferric ion is stable, the utilization rate is high, and the dephosphorization reaction is more sufficient and efficient.

[0079] As shown in Figure 2 and Figure 3 , the electrolytic dephosphorization device comprises an electrolytic dephosphorization box 1, an electrode assembly 2 and an ultrasonic transmitter 3 installed on the electrolytic dephosphorization box 1.

[0080] The upper part of the electrolytic dephosphorization box 1 is provided with a water inlet 11, and the lower part is provided with a water outlet 12. The water inlet 11 is connected with the outlet of the water pumping device; and the water outlet 12 is connected between the anoxic tank and the aerobic tank, and is preferably connected at the inlet of the aerobic tank.

[0081] The electrode assembly 2 comprises a plurality of electrode plates 21, which are inserted into the electrolytic dephosphorization box 1 from top to bottom, and the plurality of electrode plates 21 are arranged in parallel and at intervals in sequence, and the lower part is suspended.

[0082] As shown in Figure 4 , the electrode assembly 2 further comprises an insulating handle 22, a copper bar 23 and a waterproof plug 24.

[0083] The number of the insulation handle 22 is equal to the number of the polar plate 21, and each polar plate 21 is provided with one insulation handle 22. Specifically, the insulation handle 22 can be injection molded by plastic, and the upper part has an anti-slip grip part, and the lower part is provided with a plug-in slot which is matched with the upper end of the polar plate 21 for plug-in installation of the polar plate 21. The copper bar 23 is arranged on the inner wall of the plug-in slot, and when the polar plate 21 is plug-in installed with the insulation handle 22, the copper bar 23 can be in contact with the polar plate 21 for conduction. The waterproof plug 24 is arranged on one end side of the insulation handle 22 and is connected with the copper bar 23 through the conductive wire 25. The waterproof plug 24 is used to connect with the first power source outside, and when connected, the power supply path is: first power source-waterproof plug 24-conductive wire 25-copper bar 23-polar plate 21.

[0084] The plug-in slot, copper bar 23 and other structures are arranged to facilitate the installation and replacement operation of the polar plate 21, and the conductive wire does not need to be frequently connected to the polar plate 21 every time the polar plate 21 is replaced, which greatly simplifies the installation operation and makes the use more safe.

[0085] The ultrasonic wave emitter 3 is arranged in the electrolytic dephosphorization tank 1 and is arranged in parallel with the polar plate 21 on one side or both sides of the plurality of polar plates 21 (corresponding to one or two ultrasonic wave emitters 3). The emitting area of the ultrasonic wave emitter 3 is greater than or equal to the side area of the polar plate 21, that is, the ultrasonic wave emitter 3 completely covers the area where all the polar plates 21 are located when emitting ultrasonic waves, so as to ensure that all the polar plates 21 have the passivation effect.

[0086] As shown in FIGS. 1, 2 and 3, the ultrasonic wave emitter 3 is arranged in the electrolytic dephosphorization tank 1 and is arranged in parallel with the polar plate 21 on one side or both sides of the plurality of polar plates 21 (corresponding to one or two ultrasonic wave emitters 3). The emitting area of the ultrasonic wave emitter 3 is greater than or equal to the side area of the polar plate 21, that is, the ultrasonic wave emitter 3 completely covers the area where all the polar plates 21 are located when emitting ultrasonic waves, so as to ensure that all the polar plates 21 have the passivation effect. Figure 5 Figure 6 As shown in FIGS. 1, 2 and 3, the ultrasonic wave emitter 3 is arranged in the electrolytic dephosphorization tank 1 and is arranged in parallel with the polar plate 21 on one side or both sides of the plurality of polar plates 21 (corresponding to one or two ultrasonic wave emitters 3). The emitting area of the ultrasonic wave emitter 3 is greater than or equal to the side area of the polar plate 21, that is, the ultrasonic wave emitter 3 completely covers the area where all the polar plates 21 are located when emitting ultrasonic waves, so as to ensure that all the polar plates 21 have the passivation effect.

[0087] The ultrasonic wave emitter 5 is further provided with a power lead bend pipe 33 which is arranged upward from the shell 31 and is sealingly connected with the lower part of the shell 31 and is downwardly bent with the upper part being in communication with the inside of the shell 31 for the power line to pass through the second power source outside and the ultrasonic vibrator 32 inside the shell 31. The arrangement of the power lead bend pipe 33 can effectively prevent rainwater from entering the shell 31, improve the safety performance, and make the installation and use of the ultrasonic wave emitter 3 adapt to the installation of the outdoor electrolytic dephosphorization device.

[0088] The electrolytic dephosphorization tank 1 is provided with a uniform distribution mechanism on the upper part, and the water flow of the water inlet 11 is dispersed into the electrolytic dephosphorization tank 1 after passing through the uniform distribution mechanism and is uniformly dispersed from top to bottom to flow through the area around each polar plate 21. ​

[0089] As Figure 2 shown, in an embodiment, the uniform distribution mechanism includes a homogenization cavity 13 arranged on one side of the upper part of the electrolytic phosphorus removal tank 1; the water inlet 11 is arranged on the homogenization cavity 13; the homogenization cavity 13 is communicated with the upper part of the electrolytic phosphorus removal tank 1 through a plurality of water distribution holes 131, and the plurality of water distribution holes 131 are arranged horizontally and spaced apart from the plurality of polar plates 21, that is, the water distribution holes 131 are located between adjacent polar plates 21.

[0090] The electrolytic phosphorus removal device is provided with an ultrasonic wave emitter 3 on the side of the plurality of polar plates 21, and the ultrasonic wave emitting area completely covers the polar plates 21, so that the adherents and passivation substances on the polar plates 21 can be effectively removed by the ultrasonic wave, and the passivation of the polar plates 21 is prevented. At the same time, the low-frequency vibration of the ultrasonic wave can effectively avoid the iron ions released by electrolysis from being captured by the passivation substances in the water, thereby improving the utilization rate of the iron ions and ensuring the continuous and stable phosphorus removal effect. The water flows into the water inlet 11 at the upper part and flows out of the water outlet 12 at the lower part in an up-and-down manner, and the water flow is uniformly distributed and dispersed around each polar plate 21, so that the iron ions released by electrolysis are uniformly dispersed into the water body, avoiding the accumulation of iron ions between the polar plates 21 and the formation of concentration difference polarization, which affects the stable progress of the phosphorus removal reaction. The device integrates each component through the electrolytic phosphorus removal tank 1, has a compact structure, a small volume, and is easy to install and maintain, and has strong practicality.

[0091] As Figure 1 and Figure 3 shown, it also includes a first power supply, a second power supply and a third power supply connected with the electrode assembly 2, the ultrasonic wave emitter 3 and the water pumping device respectively; the first power supply, the second power supply and the third power supply are connected with the controller and controlled by the controller to operate in specific conditions.

[0092] Among them, the first power supply is a direct current power supply, and the controller controls the operation of the electrode assembly 2 by controlling the voltage, current and positive and negative electrode switching of the first power supply. The voltage of the first power supply is adjustable and is set to 0-200V, and the current range is set to 0-20A. Preferably, the voltage operating range of the first power supply is controlled within 60-200V.

[0093] The controller controls the emission frequency and time of the ultrasonic wave emitter 3 by controlling the voltage and start-stop time (i.e. the interval time between opening and closing) of the second power supply. Preferably, the second power supply is turned off for 30-60min after being turned on for 3-5min, that is, the ultrasonic wave emitter 3 is operated for 3-5min and then stopped for 30-60min. Preferably, the working frequency of the ultrasonic wave emitter 3 is controlled within 28-36KHz.

[0094] The water pumping device is a water pump, and the controller adjusts and controls the flow of the water pump by controlling the voltage of the third motor. Preferably, the water inflow of the water pump is controlled to be 50%-100% of the maximum water inflow during operation.

[0095] Specifically, the preset control parameters in the database can include the total phosphorus content (range) of the incoming water, and one or more of the control parameters of the first power supply voltage, the ultrasonic transmitter frequency and the water pump flow rate. The preset control parameters include several groups, each group of preset control parameters sets a total phosphorus content (range) of the incoming water, and corresponding to the total phosphorus content of the incoming water, there are corresponding control parameters of the first power supply voltage, the ultrasonic transmitter frequency and the water pump flow rate.

[0096] When the system is running, the controller selects and runs the corresponding preset control parameters according to the matching result of the detection result of the first total phosphorus detector and the total phosphorus content of the several preset control parameters. That is, when the system is running, the first total phosphorus detector detects the total phosphorus concentration information of the sewage to be treated in the water inlet tank, and sends the detection information to the controller, and the controller compares the total phosphorus concentration of the sewage to be treated with the total phosphorus content of the preset control parameters to match the corresponding preset control parameters, and then the controller controls the operation of the electrode assembly 2, the ultrasonic transmitter 3 and the water pump according to the matched preset control parameters.

[0097] By setting several preset control parameters in the database (the preset control parameters can be obtained by integrating and summarizing the historical control parameters, or can be obtained according to the design and operation data of the sewage treatment system), the corresponding preset control parameters are matched and selected according to the total phosphorus content of the incoming water, and the intelligent and automatic control operation is carried out, which can effectively save energy consumption, make the system quickly adapt to different types of sewage treatment working conditions, save the time of regulation and control, and improve the efficiency of sewage treatment. In addition, the database can be set as a cloud database, which can serve different regions and multiple sewage treatment systems at the same time, and realize the sharing of historical data, experience data and the like in different regions and different water qualities.

[0098] As shown in Figure 7 Based on the same inventive purpose, the embodiments of the present application also provide a control method of a sewage treatment system. The control method is suitable for the above-mentioned sewage treatment system. The control method comprises the following steps:

[0099] S1, the sewage to be treated is discharged from the water inlet tank and treated in sequence through the anoxic tank, the aerobic tank, the sedimentation tank / filter tank and the water outlet tank; the first total phosphorus detector detects the total phosphorus concentration of the sewage to be treated in the water inlet tank in real time, obtains a first detection signal and sends it to the controller in real time, and the controller converts the first detection signal into a first detection result;

[0100] S2, comparing the first detection result with the preset control parameters stored in the database to obtain the matched preset control parameters;

[0101] S3, the controller controls the ultrasonic emitter 3 and the electrode assembly 2 in the electrolytic dephosphorization device and the water pumping device according to the general parameters and the preset control parameters matched in step S2.

[0102] As shown in Figure 8 S4, the second total phosphorus detector detects the total phosphorus concentration of the water body in the pool in real time, obtains a second detection signal and sends it to the controller in real time; the controller converts the second detection signal into a second detection result and compares it with a preset threshold; when the second detection result is less than or equal to the preset threshold, the current control parameters of the controller for the electrolytic dephosphorization device (ultrasonic emitter 3 and electrode assembly 2) and the water pumping device (water pump) are maintained unchanged; when the second detection result is greater than the preset threshold, the control parameters of the controller for the electrolytic dephosphorization device and the water pumping device are corrected.

[0103] Specifically, the preset threshold is 0.5 mg / L, and of course the preset threshold can also be set to 1 mg / L, 3 mg / L or 5 mg / L, etc. according to the discharge standard.

[0104] In step S4, when the second detection result is greater than the preset threshold, the control parameters of the controller for the electrolytic dephosphorization device and the water pumping device are corrected, specifically: for every 0.1 mg / L that the second detection result is greater than the preset threshold (0.5 mg / L), the control voltage of the electrode assembly in the electrolytic dephosphorization device is increased by 1-5 V (i.e. the first power voltage is increased by 1-5 V). The voltage parameter is detected and corrected in turn until the total phosphorus concentration detected by the second total phosphorus detector is less than the preset threshold. Finally, the corrected parameters are saved to the database and uploaded to the cloud database.

[0105] According to the correction of the control parameters according to the total phosphorus concentration of the treated water body, the problem of non-compliance of the treated water body can be effectively avoided. The corrected data is uploaded to the database, which can improve the matching degree of subsequent system parameters and make the sewage treatment effect more ideal.

[0106] The general parameters include: the ultrasonic emitter 3 in the electrolytic dephosphorization device is controlled to be turned on for 3-5 min and stopped for 30-60 min; and the positive and negative poles of the direct current power supply (i.e. the first power supply) of the electrode assembly 2 in the electrolytic dephosphorization device are controlled to be reversed at a frequency of 20-30 s / turn. Usually, the general parameters are set according to the specific sewage treatment system and the specific sewage quality.

[0107] In one embodiment, the preset control parameters include several groups, which are:

[0108] When the total phosphorus content of the inlet water is 1-3 mg / L, the voltage of the direct current power supply (i.e., the first power supply) of the electrode assembly 2 is 60-70 V, the emission frequency of the ultrasonic emitter 3 is 32 KHz, and the water intake of the water pumping device (i.e., the water pump) is 50%-60% of the maximum water intake;

[0109] When the total phosphorus content of the inlet water is 3-5 mg / L, the voltage of the direct current power supply (i.e., the first power supply) of the electrode assembly 2 is 70-90 V, the emission frequency of the ultrasonic emitter 3 is 32 KHz, and the water intake of the water pumping device (i.e., the water pump) is 60%-80% of the maximum water intake;

[0110] When the total phosphorus content of the inlet water is 5-6 mg / L, the voltage of the direct current power supply (i.e., the first power supply) of the electrode assembly 2 is 90-150 V, the emission frequency of the ultrasonic emitter 3 is 28 KHz, and the water intake of the water pumping device (i.e., the water pump) is 80%-90% of the maximum water intake;

[0111] When the total phosphorus content of the inlet water is 6-8 mg / L, the voltage of the direct current power supply (i.e., the first power supply) of the electrode assembly 2 is 150-200 V, the emission frequency of the ultrasonic emitter 3 is 28 KHz, and the water intake of the water pumping device (i.e., the water pump) is 90%-100% of the maximum water intake.

[0112] In step S2, the first detection result is compared with the preset control parameters in the database to obtain the matched preset control parameters, specifically:

[0113] The first detection result is compared with the total phosphorus content of the preset control parameters in the database, the first detection result is matched to the range of the preset total phosphorus content, and the preset control parameters matched with the preset total phosphorus content range are obtained.

[0114] In operation, the sewage to be treated flows through the water inlet pool, the anoxic pool, the aerobic pool, the sedimentation tank / filter tank and the water outlet pool in sequence for treatment; when the water flows through the water inlet pool, the first total phosphorus detector detects the total phosphorus concentration in real time, and transmits the detection result to the controller in real time; the controller compares and matches the detection result with the preset control parameters in the database, obtains the corresponding matched preset control parameters, and controls the electrolytic phosphorus removal device (such as the electrode assembly, the first power supply, the ultrasonic transmitter, the second power supply) and the water pumping device according to the matched preset control parameters. Specifically, according to the different total phosphorus concentrations of the inlet water, the matched preset control parameters are selected to control the start-stop time and the ultrasonic transmission frequency of the ultrasonic transmitter 3, the voltage of the first power supply and the positive and negative electrode reversing time / frequency, and the inlet flow of the water pumping device (water pump), so as to remove phosphorus from the water body. Then, the second total phosphorus detector detects the total phosphorus concentration of the water body in the water outlet pool in real time, compares the detection result with the preset threshold value, and the preset threshold value is usually the total phosphorus discharge standard of the water body (such as 0.5 mg / L). When the detection result is less than or equal to the preset threshold value, it indicates that the phosphorus removal treatment meets the requirements, and the sewage treatment system keeps the current operating parameters. When the detection result is greater than the preset threshold value, it indicates that the phosphorus removal treatment does not meet the requirements, and the current operating preset control parameters need to be corrected according to the difference between the detection result and the preset threshold value, the voltage of the first power supply is increased, and the correction is stopped until the detection result of the second total phosphorus detector is less than or equal to the preset threshold value. Finally, the corrected control parameters are uploaded to the database and the cloud database for saving and sharing.

[0115] In summary, the control method of the sewage treatment system of the present application can match the corresponding preset control parameters according to the total phosphorus concentration of the inlet water, realize intelligent and automatic adjustment of the control parameters, adapt to different types of sewage treatment conditions, has high treatment efficiency, good treatment effect and low operation cost.

Claims

1. A wastewater treatment system, characterized in that, It includes equipment modules, detection modules, and control modules; The equipment module includes an electrolytic phosphorus removal device and an inlet pool, an anoxic pool, an aerobic pool, a sedimentation / filter pool, and an outlet pool arranged in sequence. The detection module includes a first total phosphorus detector disposed in the inlet pool and a second total phosphorus detector disposed in the outlet pool; The control module includes a controller and a database connected together; in, The outlet of the electrolytic phosphorus removal device is connected to the aerobic tank or between the anoxic tank and the aerobic tank. The inlet of the electrolytic phosphorus removal device is connected to the sedimentation tank or filter tank via a pumping device. The pumping device is used to extract the supernatant in the sedimentation tank or the filtrate in the filter tank and return it to the electrolytic phosphorus removal device. The controller is electrically connected to the first total phosphorus detector, the second total phosphorus detector, the electrolytic phosphorus removal device, and the water pumping device. The database contains several preset control parameters, including a cloud database, which serves multiple wastewater treatment systems in different regions. Electrolytic phosphorus removal equipment includes: The electrolytic phosphorus dissolution tank has an inlet at the top and an outlet at the bottom. The electrode assembly includes multiple electrode plates, which are inserted into the electrolytic phosphorus dissolution box from top to bottom, and the multiple electrode plates are arranged in parallel and spaced apart in sequence. An ultrasonic transmitter is located inside the electrolytic phosphorus dissolution chamber, on one or both sides of multiple electrode plates. The emitting area of ​​the ultrasonic transmitter is greater than or equal to the side area of ​​the electrode plate; the upper part of the electrolytic phosphate dissolution tank is provided with a uniform distribution mechanism, and the water from the inlet flows through the uniform distribution mechanism and disperses through the area around each electrode plate in the electrolytic phosphate dissolution tank. The uniform distribution mechanism includes a homogenization chamber located on one side of the upper part of the electrolytic phosphate dissolving tank; a water inlet is located on the homogenization chamber; the homogenization chamber is connected to the electrolytic phosphate dissolving tank through multiple water distribution holes, and the multiple water distribution holes are spaced apart from multiple electrode plates; The controller selects and runs the corresponding preset control parameters based on the matching results of the detection results of the first total phosphorus detector and several preset control parameters; The controller compares the second detection result converted by the second total phosphorus detector with a preset threshold. When the second detection result is less than or equal to the preset threshold, the controller maintains the control parameters of the electrolytic phosphorus removal device and the water pumping device unchanged. When the second detection result is greater than the preset threshold, the controller corrects the control parameters of the electrolytic phosphorus removal device and the water pumping device according to the difference between the second detection result and the preset threshold, and saves the corrected parameters to the database and uploads them to the cloud database.

2. The wastewater treatment system according to claim 1, characterized in that, It also includes a first power supply, a second power supply, and a third power supply respectively connected to the electrode assembly, the ultrasonic transmitter, and the pumping device; the controller is connected to the first power supply, the second power supply, and the third power supply. in, The first power source is a DC power source, and the controller controls the operation of the electrode assembly by controlling the voltage, current, and positive / negative switching of the first power source. And / or, the controller controls the transmission frequency and time of the ultrasonic transmitter by controlling the voltage and start / stop time of the second power supply; And / or, the pumping device is a water pump, and the controller controls the flow rate of the water pump by controlling the voltage of the third power supply.

3. The wastewater treatment system according to claim 2, characterized in that, The preset control parameters include the total phosphorus content of the influent, and at least one of the following control parameters: the first power supply voltage, the ultrasonic transmitter frequency, and the water pump flow rate. The controller selects and runs the corresponding preset control parameters based on the matching result of the detection result of the first total phosphorus detector and the total phosphorus content of the influent among the preset control parameters.

4. A control method for a wastewater treatment system, characterized in that, The wastewater treatment system applicable to any one of claims 1-3 includes the following steps: S1, the wastewater to be treated passes sequentially through an inlet tank, an anoxic tank, an aerobic tank, a sedimentation tank / filter, and an outlet tank; a first total phosphorus detector detects the total phosphorus concentration of the wastewater in the inlet tank, obtains a first detection signal, and sends it to the controller, which converts the first detection signal into a first detection result; S2, compare the first detection result with the preset control parameters in the database to obtain the matching preset control parameters; S3, the controller controls the operation of the electrolytic phosphorus removal device and / or the pumping device according to preset general parameters and matching preset control parameters.

5. The control method for the wastewater treatment system according to claim 4, characterized in that, Also includes: S4, the second total phosphorus detector detects the total phosphorus concentration in the water in the effluent pool, obtains a second detection signal and sends it to the controller, the controller converts the second detection signal into a second detection result and compares the second detection result with a preset threshold; When the second detection result is less than or equal to the preset threshold, the control parameters of the controller for the electrolytic phosphorus removal device and the water pumping device remain unchanged. When the second detection result is greater than the preset threshold, the controller adjusts the control parameters of the electrolytic phosphorus removal device and the pumping device.

6. The control method for the wastewater treatment system according to claim 5, characterized in that, The preset threshold is 0.5 mg / L; When the second detection result is greater than the preset threshold, the control parameters of the controller for the electrolytic phosphorus removal device and the water pumping device are corrected, specifically including: If the second detection result is 0.1 mg / L higher than the preset threshold, the controller increases the control voltage of the electrode assembly in the electrolytic phosphorus removal device by 1-5V; and saves the correction parameters to the database.

7. The control method for the wastewater treatment system according to claim 4, characterized in that: The general parameters include: In the electrolytic phosphorus removal device, the ultrasonic transmitter is turned on for 3-5 minutes and stopped for 30-60 minutes; the DC power supply of the electrode assembly in the electrolytic phosphorus removal device reverses polarity every 20-30 seconds. And / or, The preset control parameters include: When the total phosphorus content in the influent is 1-3 mg / L, the DC power supply voltage of the electrode assembly is 60-70V, the transmission frequency of the ultrasonic transmitter is 32KHz, and the influent flow rate of the pumping device is 50%-60% of the maximum influent flow rate. When the total phosphorus content in the influent is 3-5 mg / L, the DC power supply voltage of the electrode assembly is 70-90V, the transmission frequency of the ultrasonic transmitter is 32KHz, and the influent flow rate of the pumping device is 60%-80% of the maximum influent flow rate. When the total phosphorus content in the influent is 5-6 mg / L, the DC power supply voltage of the electrode assembly is 90-150V, the transmission frequency of the ultrasonic transmitter is 28KHz, and the influent flow rate of the pumping device is 80%-90% of the maximum influent flow rate. When the total phosphorus content of the influent is 6-8 mg / L, the DC power supply voltage of the electrode assembly is 150-200V, the transmission frequency of the ultrasonic transmitter is 28KHz, and the influent flow rate of the pumping device is 90%-100% of the maximum influent flow rate.

8. The control method for the wastewater treatment system according to claim 7, characterized in that, In step S2, the first detection result is compared with preset control parameters in the database to obtain matching preset control parameters, specifically including: The first detection result is compared with the total phosphorus content of the influent in the database, and the first detection result is matched to the preset range of total phosphorus content of the influent to obtain the preset control parameters that match the range of total phosphorus content of the influent.

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