Intelligent wastewater management and control system based on short-range nitrification and anaerobic ammonium oxidation process

Abstract

The present application relates to an intelligent wastewater management and control system based on short-range nitrification and anaerobic ammonium oxidation processes, belonging to the field of wastewater treatment technology. The system includes: a first regulating tank, a second regulating tank, a short-range nitrification tank, an intermediate blending tank, an anaerobic ammonium oxidation tank, a first monitoring component located in the short-range nitrification tank, and a second monitoring component located in the intermediate blending tank, as well as a plurality of pump bodies and valve bodies; the system does not require manual detection and blending of the inlet water ratio, and can achieve automatic regulation of the ratio of ammonia nitrogen and nitrite nitrogen through the linkage of the control component and each liquid level controller. At the same time, risk identification can be automatically performed through a set algorithm, the concentration of free ammonia and free nitrite can be automatically calculated, and analysis and automatic regulation can be performed according to the set inhibition concentration threshold to avoid the inhibitory effect of free ammonia and free nitrite on microorganisms.

Description

Technical Field

[0001] The present application relates to an intelligent wastewater management and control system based on short-range nitrification and anaerobic ammonia oxidation processes, and belongs to the technical field of wastewater treatment. Background Art

[0002] In recent years, a large amount of sewage (wastewater) containing nutrients such as nitrogen and phosphorus has been discharged into receiving water bodies, causing eutrophication of surface water bodies and causing algal blooms or red tides. Among them, red tide refers to the phenomenon that nitrogen and phosphorus pollution in water bodies causes various algae and plankton to reproduce rapidly, covering the water surface in a colloid state, while the dissolved oxygen in the water body decreases rapidly, and a large number of fish die. This kind of phenomenon is called algal bloom when it occurs in fresh water. The main factors causing eutrophication of surface water are nitrogen and phosphorus, and the demand for phosphorus by algae is about 1 / 10 to 1 / 20 of the demand for nitrogen. Therefore, the phosphorus content in the water body becomes a limiting factor for the proliferation of algae. Therefore, controlling pollutants and reducing the nitrogen and phosphorus content in sewage (wastewater) are the main ways to prevent eutrophication of surface water bodies.

[0003] The main physical methods for removing nitrogen-containing pollutants from sewage include ammonia stripping, electrodialysis and reverse osmosis; the main chemical methods include breakpoint chlorination, selective ion conversion, etc.; the main biological methods include anaerobic ammonia oxidation, nitrification and denitrification, land treatment, etc. Physical and chemical denitrification methods can generally only remove specific forms of nitrogen in water, and the process is complex, the cost is high, it is easy to cause secondary environmental pollution, and the regeneration method is not perfect. Therefore, it is only suitable for treating small and medium-sized water pollutants and is difficult to promote and apply on a large scale. The biological denitrification method has a wide range of applications, the lowest investment and operating costs, simple operation, no secondary pollution, and strong reliability in meeting water discharge standards. Therefore, it has become the first choice for denitrification methods at home and abroad.

[0004] The biological method commonly used at present is to use a combination of short-cut nitrification and anaerobic ammonium oxidation to carry out denitrification. For example: The invention patent "Device and method for realizing deep denitrification of sewage treatment plant tailwater by short-range denitrification anaerobic ammonia oxidation coupled with anoxic MBBR process" with application number 202211059287.6 discloses the following technical scheme: the denitrification device includes a water storage tank for the outlet of the secondary sedimentation tank; the water storage tank for the outlet of the secondary sedimentation tank is connected to the first water inlet of the PDA-MBBR through the first water inlet pump; the sludge fermentation liquid storage tank is connected to the second water inlet of the PDA-MBBR through the second water inlet pump; the PDA-MBBR is connected to the water inlet of the clear water tank through the water outlet; an anoxic agitator (3.7), a pH probe (3.8), a dissolved oxygen (DO) probe (3.9), an ammonia nitrogen and nitrate nitrogen online monitoring device (3.10), and an MBBR filler (3.11) are provided in the PDA-MBBR; a control device is connected to the first water inlet pump, the second water inlet pump II, the anoxic agitator, the pH probe, the dissolved oxygen (DO) probe, and the nitrogen and nitrate nitrogen online monitoring device through a signal line. After completing the anaerobic ammonium oxidation acclimatization, the activated sludge is inoculated at a concentration of 2000-4000 mg / L, and the influent is NO3 - -N and NH4 + -N and artificial water with a mass concentration ratio of 1.4:1-1.6:1 and a total nitrogen (TN) concentration of 15-30 mg / L, sodium acetate is added as a short-cut denitrification carbon source, and when the TN removal rate exceeds 90% and is stably maintained for 20 days, the coupling of short-cut denitrification anaerobic ammonia oxidation and anoxic MBBR is completed; the domestic sewage plant tail water in the secondary sedimentation tank enters the PDA-MBBR system, the nitrate nitrogen mass concentration of the domestic sewage plant tail water is 10 mg / L~20 mg / L, and the volume ratio of the domestic sewage plant tail water to the fermentation liquid entering the PDA-MBBR is controlled to be 12:1~16: 1. Make the ratio of chemical oxygen demand to nitrate nitrogen mass concentration after influent to 2.5-3.5, and carry out sludge fermentation coupled with short-range denitrification / anaerobic ammonium oxidation reaction; turn on the stirring device in the PDA-MBBR system, record the changes of pH and dissolved oxygen (DO), maintain the pH value at 7.0-9.0, maintain DO at 0.3-0.8 mg / L, control the sludge concentration in PDA-MBBR to 2000-4000 mg / L, the hydraulic retention time of PDA-MBBR to 6-10h, and the sludge retention time to 20-30d; the treated effluent is discharged through the outlet pipe.

[0005] However, the above device requires manual water distribution for the incoming water in advance, and at this time, frequent manual testing and distribution are required, resulting in low wastewater treatment efficiency. Summary of the invention

[0006] This application provides an intelligent wastewater management and control system based on short-range nitrification and anaerobic ammonium oxidation processes, which can solve the problem of low wastewater treatment efficiency caused by artificial water distribution. This application provides the following technical solutions:

[0007] Provided is an intelligent wastewater management and control system based on short-range nitrification and anaerobic ammonium oxidation processes, the system comprising:

[0008] A first regulating tank and a second regulating tank suitable for accommodating high-ammonia nitrogen wastewater to be treated; the first regulating tank is provided with a first water inlet and a first water outlet for the high-ammonia nitrogen wastewater; the second regulating tank is provided with a second water inlet and a second water outlet for the high-ammonia nitrogen wastewater;

[0009] A short-distance nitrification tank connected to the first water outlet through a first pump body, the short-distance nitrification tank is connected to a fan through an oxygen supply port to input oxygen into the short-distance nitrification tank, and oxidize the liquid containing ammonia nitrogen pumped into the first pump body into nitrite; the short-distance nitrification tank is also provided with a third water outlet to output the liquid containing nitrite; the short-distance nitrification tank is also provided with a first monitoring component, the first monitoring component includes a first dissolved oxygen online meter, a first nitrite nitrogen online meter, a first pH online meter and a first temperature online meter;

[0010] An intermediate blending tank connected to the second water outlet through a second pump body, and the intermediate blending tank is also connected to the third water outlet; the intermediate blending tank is suitable for blending the ratio of nitrite nitrogen and ammonia nitrogen, the concentration of free nitrite and the concentration of free ammonia in the liquid; the intermediate blending tank is provided with a fourth water outlet to output the blended liquid through the fourth water outlet; the intermediate blending tank is also provided with a second monitoring component, and the second monitoring component includes a second dissolved oxygen online meter, a second nitrite nitrogen online meter, a second pH online meter, a second temperature online meter and an ammonia nitrogen online meter;

[0011] An anaerobic ammonium oxidation tank connected to the fourth water outlet through a third pump body, the anaerobic ammonium oxidation tank is suitable for removing nitrogen generated by the liquid containing ammonia nitrogen and nitrite nitrogen under the action of autotrophic anaerobic ammonium oxidation bacteria; the anaerobic ammonium oxidation tank includes a fifth water outlet and a sixth water outlet, the fifth water outlet is connected to the intermediate blending tank, and the sixth water outlet is used to output the treated liquid;

[0012] A control component connected to the first pump body, the second pump body, the third pump body, the first monitoring component and the second monitoring component, the control component is used to:

[0013] Acquire monitoring data collected by the first monitoring component and the second monitoring component;

[0014] Based on the monitoring data of the first dissolved oxygen online instrument, the oxygen supply of the fan is controlled so that the dissolved oxygen concentration of the short-range nitrification tank is [0.4, 0.7] mg / L;

[0015] Calculating a first concentration of free nitrite in the short-range nitrification tank based on monitoring data of the first nitrite nitrogen online instrument, the first pH online instrument, and the first temperature online instrument; and controlling the fifth water outlet to be turned on when the first concentration is higher than a first concentration threshold;

[0016] Based on the monitoring data of the second dissolved oxygen online instrument, the fifth water outlet is controlled to be turned on so that the dissolved oxygen concentration in the intermediate blending tank is [0.4, 0.7] mg / L;

[0017] Based on the monitoring data of the second nitrite nitrogen online instrument and the ammonia nitrogen online instrument, determine whether the ratio of nitrite nitrogen to ammonia nitrogen in the intermediate blending tank is greater than the set value; when the ratio of nitrite nitrogen to ammonia nitrogen is less than the set value, control the first pump body to start, and control the third water outlet to be connected; when the ratio of nitrite nitrogen to ammonia nitrogen is greater than the set value, control the second pump body to start;

[0018] Calculate the second concentration of free nitrous acid in the intermediate blending tank based on the monitoring data of the second nitrite nitrogen online instrument, the second pH online instrument and the second temperature online instrument; and control the fifth water outlet to be turned on when the second concentration is higher than the first concentration threshold;

[0019] Based on the monitoring data of the ammonia nitrogen online instrument, the second pH online instrument and the second temperature online instrument, a third concentration of free ammonia in the intermediate blending tank is calculated; when the third concentration is higher than the second concentration threshold, the fifth water outlet is controlled to be turned on;

[0020] When the ratio of the nitrite nitrogen to the ammonia nitrogen is the set value, and the first concentration, the second concentration, and the third concentration all meet the preset requirements, the third pump body is controlled to start.

[0021] Optionally, the system further comprises: a first valve body adapted to control the opening or closing of the first water inlet and a first liquid level controller connected to the first valve body;

[0022] When the liquid level in the first regulating tank is less than a first liquid level threshold, the first liquid level controller controls the first valve body to open to connect the first water inlet; when the liquid level in the first regulating tank is greater than a second liquid level threshold, the first liquid level controller controls the first valve body to close to shut off the first water inlet, and / or controls the first pump body to start to discharge the liquid in the first regulating tank from the first water outlet.

[0023] Optionally, the system further comprises: a second valve body adapted to control the opening or closing of the second water inlet and a second liquid level controller connected to the second valve body;

[0024] When the liquid level in the second regulating tank is less than the third liquid level threshold, the second liquid level controller controls the second valve body to open to connect the second water inlet; when the liquid level in the second regulating tank is greater than the fourth liquid level threshold, the second liquid level controller controls the second valve body to close to shut off the second water inlet, and / or controls the second pump body to start to discharge the liquid in the second regulating tank from the second water outlet.

[0025] Optionally, the system further comprises: a third valve body adapted to control the opening or closing of the third water outlet, wherein the third valve body is connected to the control assembly; accordingly, controlling the opening of the third water outlet comprises:

[0026] The third valve body is controlled to open to connect the third water outlet.

[0027] Optionally, the system further comprises: a fourth valve body adapted to control the opening or closing of the fifth water outlet, the fourth valve body being connected to the control assembly; accordingly, the controlling the opening of the fifth water outlet comprises:

[0028] The fourth valve body is controlled to open to connect the fifth water outlet.

[0029] Optionally, the system further comprises: a third liquid level controller connected to the second pump body and the third pump body respectively;

[0030] The third liquid level controller controls the second pump to start when the liquid level in the intermediate mixing tank is less than the fifth liquid level threshold; and controls the third pump to start when the liquid level in the intermediate mixing tank is greater than the sixth liquid level threshold.

[0031] Optionally, the first concentration of free nitrite in the short-range nitrification tank is calculated based on the monitoring data of the first nitrite nitrogen online instrument, the first pH online instrument and the first temperature online instrument, and the second concentration of free nitrite in the intermediate blending tank is calculated based on the monitoring data of the second nitrite nitrogen online instrument, the second pH online instrument and the second temperature online instrument, which are expressed by the following formula:

[0032]

[0033]

[0034] Among them, F NA represents the first concentration or the second concentration, SNO2- represents the concentration of nitrite nitrogen monitored by the first nitrite nitrogen online meter or the second nitrite nitrogen online meter, pH represents the pH value monitored by the first pH online meter or the second pH online meter, and T represents the temperature value monitored by the first temperature online meter or the second temperature online meter.

[0035] Optionally, the third concentration of free ammonia in the intermediate blending tank is calculated based on the monitoring data of the ammonia nitrogen online instrument, the second pH online instrument and the second temperature online instrument, and is expressed by the following formula:

[0036]

[0037] Among them, C FA represents the third concentration, C NH4-N It represents the concentration of ammonia nitrogen monitored by the ammonia nitrogen online instrument, pH represents the pH value monitored by the second pH online instrument, and T represents the temperature value monitored by the second temperature online instrument.

[0038] Optionally, the first concentration threshold is 200 mg / L, the second concentration threshold is 150 mg / L, and the set value is 1.3:1.

[0039] The beneficial effects of the present application include at least: the intelligent wastewater management and control system based on short-range nitrification and anaerobic ammonia oxidation process does not require manual detection and adjustment of the water ratio, and can realize automatic regulation of the ratio of ammonia nitrogen and nitrite nitrogen through the linkage of the control components and each liquid level controller. At the same time, the risk identification can be automatically performed through the set algorithm, the concentration of free ammonia and free nitrite can be automatically calculated, and the analysis and automatic regulation can be performed according to the set inhibition concentration threshold to avoid the inhibitory effect of free ammonia and free nitrite on microorganisms.

[0040] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of an intelligent wastewater management and control system based on short-range nitrification and anaerobic ammonia oxidation process provided by an embodiment of the present application;

[0042] Figure 2 It is a schematic diagram of the intelligent wastewater management and control logic based on short-range nitrification and anaerobic ammonia oxidation processes provided in one embodiment of the present application. DETAILED DESCRIPTION

[0043] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.

[0044] Figure 1 It is a structural schematic diagram of an intelligent wastewater management and control system based on short-range nitrification and anaerobic ammonia oxidation processes provided by an embodiment of the present application. The system mainly includes: a first regulating tank 10, a second regulating tank 20, a short-range nitrification tank 30, an intermediate blending tank 40 and an anaerobic ammonia oxidation tank 50.

[0045] The first regulating tank 10 and the second regulating tank 20 are suitable for containing high-ammonia nitrogen wastewater to be treated. The first regulating tank 10 and the second regulating tank 20 are mainly used to regulate the water quality and water quantity of high-ammonia nitrogen wastewater.

[0046] The first regulating tank 10 is provided with a first water inlet 101 and a first water outlet 102 for high ammonia nitrogen wastewater. The first water inlet 101 is used to introduce high ammonia nitrogen wastewater into the first regulating tank 10, and the first water outlet 102 is used to export high ammonia nitrogen wastewater from the first regulating tank 10.

[0047] In one example, the system further includes: a first valve body 103 adapted to control the on or off of the first water inlet 101 and a first liquid level controller 104 connected to the first valve body 103. The first valve body 103 is disposed on the first water inlet 101, and the first liquid level controller 104 is disposed in the first regulating tank 10 to detect the liquid level of the first regulating tank 10 and control the first valve body 103 based on the liquid level of the first regulating tank 10.

[0048] Specifically, when the liquid level in the first regulating tank 10 is less than the first liquid level threshold, the first liquid level controller 104 controls the first valve body 103 to open to connect the first water inlet 101; when the liquid level in the first regulating tank 10 is greater than the second liquid level threshold, the first valve body 103 is controlled to close to shut off the first water inlet 101, and / or controls the first pump body 105 to open to discharge the liquid in the first regulating tank 10 from the first water outlet 102.

[0049] The second regulating tank 20 is provided with a second water inlet 201 and a second water outlet 202 for high ammonia nitrogen wastewater. The second water inlet 201 is used to introduce high ammonia nitrogen wastewater into the second regulating tank 20, and the second water outlet 202 is used to export high ammonia nitrogen wastewater from the second regulating tank 20.

[0050] In one example, the system further includes: a second valve body 203 suitable for controlling the on or off of the second water inlet 201 and a second liquid level controller 204 connected to the second valve body 203. The second valve body 203 is arranged on the second water inlet 201, and the second liquid level controller 204 is arranged in the second regulating tank 20 to detect the liquid level of the second regulating tank 20 and control the second valve body 203 based on the liquid level of the second regulating tank 20.

[0051] Specifically, when the liquid level in the second regulating tank 20 is less than the third liquid level threshold, the second liquid level controller 204 controls the second valve body 203 to open to connect the second water inlet 201; when the liquid level in the second regulating tank 20 is greater than the fourth liquid level threshold, the second valve body 203 is controlled to close to shut off the second water inlet 201, and / or the second pump body 205 is controlled to open to discharge the liquid in the second regulating tank 20 from the second water outlet 202.

[0052] The short-range nitrification tank 30 utilizes the inherent differences in the kinetic characteristics of nitrate bacteria and nitrite bacteria to control the nitrification reaction to only proceed to the point where NO2 - -N stage, resulting in a large amount of NO2 - -N accumulation reaction pool. In the short-range nitrification pool 30, factors such as dissolved oxygen (DO), pH and temperature need to be strictly controlled. The reaction formula in the short-range nitrification pool 30 is as follows:

[0053] NH4 + +1.5O2→NO2 – +H2O+2H + .

[0054] According to the above reaction formula, the short-distance nitrification tank 30 mainly uses oxygen to convert ammonia into nitrite. Based on this, in this embodiment, the short-distance nitrification tank 30 is connected to the first water outlet 102 through the first pump body 105, and the short-distance nitrification tank 30 is connected to the fan 60 through the oxygen supply port 301 to input oxygen into the short-distance nitrification tank 30 and oxidize the liquid containing ammonia nitrogen pumped into the first pump body 105 into nitrite. The short-distance nitrification tank 30 is also provided with a third water outlet 302 to output the liquid containing nitrite.

[0055] Since the influencing factors such as dissolved oxygen (DO), pH and temperature need to be strictly controlled in the short-range nitrification tank 30, in the present application, a first monitoring component 303 is also provided in the short-range nitrification tank 30. The first monitoring component 303 includes a first dissolved oxygen online meter, a first nitrite nitrogen online meter, a first pH online meter, a first temperature online meter and an ammonia nitrogen online meter.

[0056] The dissolved oxygen online meter (including the first dissolved oxygen online meter mentioned above and the second dissolved oxygen online meter hereinafter) is used to monitor the dissolved oxygen concentration of the liquid in the short-range nitrification tank 30.

[0057] The nitrite nitrogen online meter (including the first nitrite nitrogen online meter mentioned above and the second nitrite nitrogen online meter hereinafter) is used to monitor the nitrite nitrogen concentration of the liquid in the short-cut nitrification tank 30.

[0058] The pH online meter (including the first pH online meter mentioned above and the second pH online meter hereinafter) is used to monitor the pH value of the liquid in the short-cut nitrification tank 30 .

[0059] The temperature online meter (including the first temperature online meter mentioned above and the second temperature online meter hereinafter) is used to monitor the temperature value of the liquid in the short-range nitrification tank 30.

[0060] The ammonia nitrogen online meter (including the ammonia nitrogen online meter mentioned above and the ammonia nitrogen online meter hereinafter) is used to monitor the ammonia nitrogen value of the liquid in the short-cut nitrification tank 30.

[0061] Figure 1 In the figure, the number of the first pump bodies 105 is two, and correspondingly, the number of the first water outlets 102 is two for illustration. In actual implementation, the number of the first pump bodies 105 and the first water outlets 102 can be one or at least two. This embodiment does not limit the number of the first pump bodies 105 and the first water outlets 102.

[0062] Illustratively, the first pump body 105 can be activated by a 4-20 mA signal.

[0063] Optionally, the system further includes a third valve body 304 suitable for controlling the third water outlet 302 to be turned on or off.

[0064] The main function of the intermediate blending tank 40 is to adjust the water quality and quantity of the incoming water, adjust the ratio of nitrite nitrogen / ammonia nitrogen, and automatically identify risks through a set algorithm, automatically calculate the concentrations of free ammonia and free nitrite, and perform analysis and automatic regulation to avoid the inhibition of free ammonia and free nitrite on microorganisms.

[0065] Specifically, the intermediate blending tank 40 is connected to the second water outlet 202 through the second pump body 205, and the intermediate blending tank 40 is also connected to the third water outlet 302. In this way, the intermediate blending tank 40 can receive the liquid with nitrite nitrogen output from the short-range nitrification tank 30, and can also receive the high ammonia nitrogen wastewater output from the second regulating tank 20. At this time, the intermediate blending tank 40 is suitable for blending the ratio of nitrite nitrogen and ammonia nitrogen in the liquid, the concentration of free nitrous acid and the concentration of free ammonia. The intermediate blending tank 40 is provided with a fourth water outlet 401 to output the blended liquid through the fourth water outlet 401.

[0066] Since the intermediate blending tank 40 needs to automatically adjust the ratio of nitrite nitrogen and ammonia nitrogen, the concentration of free nitrite and the concentration of free ammonia, the intermediate blending tank 40 is also provided with a second monitoring component 402, and the second monitoring component 402 includes a second dissolved oxygen online meter, a second nitrite nitrogen online meter, a second pH online meter, a second temperature online meter and an ammonia nitrogen online meter.

[0067] The main function of the anaerobic ammonium oxidation tank 50 is to remove nitrogen gas generated by ammonia nitrogen and nitrite nitrogen under the action of autotrophic anaerobic ammonium oxidizing bacteria. The reactants of anaerobic ammonium oxidation are ammonia and nitrite, and the main products are nitrogen gas and nitrate. The anaerobic ammonium oxidation reaction process including cell synthesis can be expressed as follows:

[0068] NH4 + +1.32NO2 - +0.066HCO3 - +0.13H + →1.02N2+0.26NO3 - +

[0069] 0.066CH2O 0.5 N 0.15 +2.03H2O

[0070] Among them, NH4 + -N consumption, NO2 – -N consumption and NO3 – The stoichiometric ratio of -N generation is 1:1.32:0.26.

[0071] The anaerobic ammonium oxidation tank 50 is connected to the fourth water outlet 401 through the third pump body 403. The anaerobic ammonium oxidation tank 50 is suitable for removing nitrogen generated by the liquid containing ammonia nitrogen and nitrite nitrogen under the action of autotrophic anaerobic ammonium oxidizing bacteria; the anaerobic ammonium oxidation tank 50 includes a fifth water outlet 501 and a sixth water outlet 502, wherein the fifth water outlet 501 is connected to the intermediate mixing tank 40, and the sixth water outlet 502 is used to output the treated liquid.

[0072] Illustratively, the system further comprises a fourth valve body 503 adapted to control the fifth water outlet 501 to be turned on or off.

[0073] Optionally, the system further includes: a third liquid level controller 404 respectively connected to the second pump body 205 and the third pump body 403. The third liquid level controller 404 is installed in the intermediate blending tank 40, and is suitable for detecting the liquid level of the intermediate blending tank 40, and controlling the start-up of the second pump body 205 and the third pump body 403 based on the liquid in the intermediate blending tank 40.

[0074] Specifically, the third liquid level controller 404 controls the second pump body 205 to start when the liquid level of the intermediate mixing tank 40 is less than the fifth liquid level threshold; and controls the third pump body 403 to start when the liquid level of the intermediate mixing tank 40 is greater than the sixth liquid level threshold.

[0075] The control component is connected to the first pump body 105, the second pump body 205, the third pump body 403, the first valve body 103, the second valve body 203, the third valve body 304, the fourth valve body 503, the first monitoring component 303 and the second monitoring component 402. The control component can be implemented as a programmable logic controller (PLC) or a device with processing capabilities such as a computer, and this embodiment does not limit the implementation method of the control component.

[0076] In this embodiment, the control component is used to:

[0077] Acquire monitoring data collected by the first monitoring component 303 and the second monitoring component 402;

[0078] Based on the monitoring data of the first dissolved oxygen online instrument, the oxygen supply of the fan 60 is controlled so that the dissolved oxygen concentration of the short-range nitrification tank 30 is [0.4, 0.7] mg / L;

[0079] Based on the monitoring data of the first nitrite nitrogen online instrument, the first pH online instrument and the first temperature online instrument, the first concentration of free nitrite in the short-range nitrification tank 30 is calculated; when the first concentration is higher than the first concentration threshold, the fifth water outlet 501 is controlled to be turned on;

[0080] Based on the monitoring data of the second dissolved oxygen online instrument, the fifth water outlet 501 is controlled to be turned on, so that the dissolved oxygen concentration in the intermediate blending tank 40 is [0.4, 0.7] mg / L;

[0081] Based on the monitoring data of the second nitrite nitrogen online instrument and the ammonia nitrogen online instrument, determine whether the ratio of nitrite nitrogen to ammonia nitrogen in the intermediate blending tank 40 is greater than the set value; when the ratio of nitrite nitrogen to ammonia nitrogen is less than the set value, control the first pump body 105 to start, and control the third water outlet 302 to be turned on; when the ratio of nitrite nitrogen to ammonia nitrogen is greater than the set value, control the second pump body 205 to start;

[0082] Based on the monitoring data of the second nitrite nitrogen online instrument, the second pH online instrument and the second temperature online instrument, the second concentration of free nitrous acid in the intermediate blending tank 40 is calculated; when the second concentration is higher than the first concentration threshold, the fifth water outlet 501 is controlled to be turned on; wherein, controlling the fifth water outlet 501 to be turned on includes: controlling the fourth valve body 503 to open, so as to turn on the fifth water outlet 501.

[0083] Based on the monitoring data of the ammonia nitrogen online meter, the second pH online meter and the second temperature online meter, the third concentration of free ammonia in the intermediate blending tank 40 is calculated; when the third concentration is higher than the second concentration threshold, the fifth water outlet 501 is controlled to be open.

[0084] When the ratio of nitrite nitrogen to ammonia nitrogen is a set value and the first concentration, the second concentration and the third concentration all meet the preset requirements, the third pump body 403 is controlled to start.

[0085] In one example, the first concentration threshold is 200 mg / L, the second concentration threshold is 150 mg / L, and the set value is 1.3:1.

[0086] The control logic of the control components for the first regulating tank 10, the second regulating tank 20, the short-cut nitrification tank 30, the intermediate blending tank 40 and the anaerobic ammonia oxidation tank 50 are introduced respectively below.

[0087] First, for the first regulating tank 10, the control component determines that the ratio of nitrite nitrogen to ammonia nitrogen in the intermediate adjustment tank 40 is less than the set value (1.3:1). At this time, it means that the amount of nitrite nitrogen is small, and it is necessary to control the short-range nitrification tank 30 to produce more nitrite nitrogen. Therefore, the first pump body 105 can be controlled to open by a 4-20mA current signal. Since the start of the first pump body 105 will cause the liquid level in the first regulating tank 10 to drop, at this time, when the liquid level of the first regulating tank 10 is less than the first liquid level threshold, the first valve body 103 is automatically controlled to open to conduct the first water inlet 101. Afterwards, when the liquid level of the first regulating tank 10 is greater than the second liquid level threshold, the first valve body 103 is controlled to close to shut off the first water inlet 101; the first pump body 105 is controlled to open so that high ammonia nitrogen wastewater flows out of the first regulating tank 10.

[0088] In other words, the first pump body 105 is controlled by two aspects, one is controlled by the nitrite nitrogen / ammonia nitrogen ratio, and the other is controlled by the liquid level in the first regulating tank 10. When the nitrate nitrogen / ammonia nitrogen ratio is less than the set value or the liquid level in the first regulating tank 10 is greater than the second liquid level threshold, the first pump body 105 is started.

[0089] The first liquid level threshold is smaller than the second liquid level threshold. The first liquid level threshold and the second liquid level threshold are stored in the first liquid level controller 104. This embodiment does not limit the values ​​of the first liquid level threshold and the second liquid level threshold.

[0090] Second, for the second regulating tank 20, the control component determines that the ratio of nitrite nitrogen to ammonia nitrogen in the intermediate adjustment tank 40 is greater than the set value (1.3:1). At this time, it means that the amount of nitrite nitrogen is large, and more ammonia nitrogen needs to be input into the intermediate adjustment tank 40. Therefore, the second pump body 205 can be controlled to open by a 4-20mA current signal to input a liquid containing ammonia nitrogen into the intermediate adjustment tank 40. Since the start of the second pump body 205 will cause the liquid level in the second regulating tank 20 to drop, at this time, when the liquid level of the second regulating tank 20 is less than the third liquid level threshold, the second valve body 203 is automatically controlled to open to conduct the second water inlet 201. Afterwards, when the liquid level of the second regulating tank 20 is greater than the fourth liquid level threshold, the second valve body 203 is controlled to close to shut off the second water inlet 201; the second pump body 205 is controlled to open to allow high ammonia nitrogen wastewater to flow out of the second regulating tank 20.

[0091] In other words, the second pump body 205 is controlled by two aspects, one is controlled by the nitrite nitrogen / ammonia nitrogen ratio, and the other is controlled by the liquid level in the second regulating tank 20. When the nitrate nitrogen / ammonia nitrogen ratio is greater than the set value or the liquid level in the second regulating tank 20 is greater than the fourth liquid level threshold, the second pump body 205 is started.

[0092] The third liquid level threshold is smaller than the fourth liquid level threshold. The third liquid level threshold and the fourth liquid level threshold are stored in the second liquid level controller 204. This embodiment does not limit the values ​​of the third liquid level threshold and the fourth liquid level threshold.

[0093] Third, for the short-range nitrification tank 30, the dissolved oxygen concentration of the liquid in the short-range nitrification tank 30 is determined by the DO concentration collected by the first dissolved oxygen online instrument. If it is lower than 0.4 mg / L, the oxygen supply of the fan 60 is controlled, for example: the control component is connected to the fan 60 to control the start of the fan 60 to realize oxygen supply; if it is higher than 0.7 mg / L, the fan 60 is controlled to stop to stop oxygen supply.

[0094] At the same time, the control component also calculates the first concentration of free nitrite in the short-range nitrification tank 30 based on the monitoring data of the first nitrite nitrogen online instrument, the first pH online instrument and the first temperature online instrument, which is expressed by the following formula:

[0095]

[0096]

[0097] Among them, F NA represents the first concentration, S NO2- It represents the concentration of nitrite nitrogen monitored by the first nitrite nitrogen online instrument, pH represents the pH value monitored by the first pH online instrument, and T represents the temperature value monitored by the first temperature online instrument.

[0098] After calculating the first concentration of free nitrous acid, the control component automatically identifies the risk of inhibiting concentration, that is, automatically controls the fourth valve body 503 to open after it is higher than 200 mg / L for dilution and preparation.

[0099] Fourth, for the intermediate blending tank 40, monitoring data is collected through the second nitrite nitrogen online instrument and the ammonia nitrogen online instrument, and the difference between the ratio of nitrite nitrogen / ammonia nitrogen and the set value of 1.3:1 is determined through the control component; when it is lower than the set value, the third valve body 304 is automatically opened to adjust the ratio of nitrite nitrogen / ammonia nitrogen through the intermediate blending tank 40, and then the first pump body 105 is controlled to open through the 4-20mA signal, the first liquid level controller 104 performs liquid level identification, and the low liquid level first valve body 103 opens; when the ratio of nitrite nitrogen / ammonia nitrogen is higher than the set value, the second pump body 205 is controlled to open through the 4-20mA signal, the second liquid level controller 204 performs liquid level identification, and the low liquid level second valve body 203 opens.

[0100] At the same time, the control component also needs to automatically calculate the concentration of free nitrite (FNA) and the concentration of free ammonia (CFA) by combining the temperature, pH, ammonia nitrogen and nitrite nitrogen concentrations through a set algorithm. Specifically, based on the monitoring data of the second nitrite nitrogen online instrument, the second pH online instrument and the second temperature online instrument, the second concentration of free nitrite in the intermediate blending tank 40 is calculated, which is expressed by the following formula:

[0101]

[0102]

[0103] Among them, F NA represents the second concentration, S NO2- It represents the concentration of nitrite nitrogen monitored by the second nitrite nitrogen online instrument, pH represents the pH value monitored by the second pH online instrument, and T represents the temperature value monitored by the second temperature online instrument.

[0104] Based on the monitoring data of the ammonia nitrogen online instrument, the second pH online instrument and the second temperature online instrument, the third concentration of free ammonia in the intermediate blending tank 40 is calculated and expressed by the following formula:

[0105]

[0106] Among them, C FA Indicates the third concentration, C NH4-N It represents the concentration of ammonia nitrogen monitored by the ammonia nitrogen online instrument, pH represents the pH value monitored by the second pH online instrument, and T represents the temperature value monitored by the second temperature online instrument.

[0107] After the nitrite nitrogen / ammonia nitrogen ratio, free nitrite (FNA) concentration and free ammonia (CFA) concentration of the system meet the conditions, the third pump body 403 is turned on and the system runs fully automatically.

[0108] Among them, the preset requirement corresponding to the free nitrite (FNA) concentration is less than the first concentration threshold, and the preset requirement corresponding to the free ammonia (CFA) concentration is less than the second concentration threshold.

[0109] In order to more clearly understand the overall automatic wastewater treatment process in the above-mentioned system of the present application, the control logic of the entire system is fully introduced below by taking an example.

[0110] refer to Figure 2 After the system is started, since there is no water in the first regulating tank and the second regulating tank, the first liquid level controller will open the first valve body based on the current liquid level of the first regulating tank, thereby connecting the first water inlet. As the liquid level in the first regulating tank rises, the first liquid level controller will trigger the first pump body to start, thereby delivering water to the short-range nitrification tank. When the liquid level of the first liquid level controller is lower than the second liquid level threshold, the first pump body will be triggered to shut down.

[0111] Similarly, the second liquid level controller will open the second valve body based on the current liquid level of the second regulating tank, thereby connecting the second water inlet. As the liquid level in the second regulating tank rises, the second liquid level controller will trigger the second pump body to start, thereby transferring water to the intermediate blending tank. When the liquid level of the second liquid level controller is lower than the fourth liquid level threshold, the second pump body will be triggered to shut down. At this stage, there is only high ammonia nitrogen wastewater in the intermediate blending tank. Therefore, the control component will determine that the nitrite nitrogen / ammonia nitrogen ratio in the intermediate blending tank is less than the set value (1.3:1), and therefore, it will control the third valve to open, thereby connecting the third water outlet.

[0112] In the short-distance nitrification tank, the control component obtains the dissolved oxygen concentration collected by the first dissolved oxygen online instrument, and controls the fan to be turned on or off based on the dissolved oxygen concentration collected by the first dissolved oxygen online instrument, so that the dissolved oxygen concentration of the short-distance nitrification tank is [0.4, 0.7] mg / L. After the wastewater enters the short-distance nitrification tank, the short-distance nitrification tank will produce nitrite nitrogen, and the third water outlet is connected. Therefore, as the amount of wastewater increases, the nitrite nitrogen will also increase. In the intermediate allocation tank, the nitrite nitrogen / ammonia nitrogen ratio will gradually increase. When it is greater than the set value (1.3:1), the control component will start the second pump body to increase the amount of ammonia nitrogen, and the cycle will continue, so that the nitrite nitrogen / ammonia nitrogen ratio is always maintained at the set value.

[0113] In the initial stage, the free nitrite concentration in the short-range nitrification tank is usually not too high, and the free nitrite concentration and free ammonia concentration in the intermediate blending tank are not too high either, that is, the free nitrite concentration and the free ammonia concentration will meet the preset requirements; or, there is more liquid in the intermediate blending tank, so the control component or the third liquid level controller will control the third pump body to start, so as to input the liquid in the intermediate blending tank into the anaerobic ammonia oxidation tank for nitrogen removal.

[0114] As time goes by, the control component continues to calculate the first concentration of free nitrite based on the monitoring data collected by the first nitrite nitrogen online meter, the first pH online meter and the first temperature online meter. If the first concentration is greater than 200 mg / L, the fourth valve body will be controlled to open to connect the fifth water outlet, thereby diluting the concentration of free nitrite; at the same time, the second concentration of free nitrite is calculated based on the monitoring data collected by the second nitrite nitrogen online meter, the second pH online meter and the second temperature online meter. If the second concentration is greater than 200 mg / L, the fourth valve body will also be controlled to open to connect the fifth water outlet, thereby diluting the concentration of free nitrite; and the third concentration of free ammonia is calculated based on the monitoring data collected by the ammonia nitrogen online meter, the second pH online meter and the second temperature online meter. If the third concentration is greater than 150 mg / L, the fourth valve body will be controlled to open to connect the fifth water outlet, thereby diluting the concentration of ammonia nitrogen.

[0115] At the same time, the dissolved oxygen concentration collected by the second dissolved oxygen collector in the intermediate blending tank will control the opening or closing of the fourth valve body, so that the dissolved oxygen concentration in the short-range nitrification tank is [0.4, 0.7] mg / L.

[0116] In addition, the intermediate mixing tank also uses the third liquid level controller to control the second pump body to start to supply water to the intermediate mixing tank when there is less liquid in the intermediate mixing tank. When there is more liquid in the intermediate mixing tank, the third liquid level controller controls the second pump body to shut down and controls the third pump body to start to supply water to the intermediate mixing tank.

[0117] According to the above process, the linkage between the control components and each liquid level controller can realize the fully automatic allocation and control of the entire wastewater treatment system.

[0118] In summary, the intelligent wastewater management and control system based on short-range nitrification and anaerobic ammonia oxidation process provided in this embodiment does not require manual detection and adjustment of the water inlet ratio, and can realize automatic regulation of the ratio of ammonia nitrogen and nitrite nitrogen through the linkage of the control component and each liquid level controller. At the same time, risk identification can be automatically performed through the set algorithm, the concentration of free ammonia and free nitrite can be automatically calculated, and analysis and automatic regulation can be performed according to the set inhibition concentration threshold to avoid the inhibitory effect of free ammonia and free nitrite on microorganisms.

[0119] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0120] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. An intelligent wastewater management and control system based on short-range nitrification and anaerobic ammonium oxidation process, characterized in that: The system comprises: A first regulating tank and a second regulating tank suitable for accommodating high-ammonia nitrogen wastewater to be treated; the first regulating tank is provided with a first water inlet and a first water outlet for the high-ammonia nitrogen wastewater; the second regulating tank is provided with a second water inlet and a second water outlet for the high-ammonia nitrogen wastewater; A short-distance nitrification tank connected to the first water outlet through a first pump body, the short-distance nitrification tank is connected to a fan through an oxygen supply port to input oxygen into the short-distance nitrification tank, and oxidize the liquid containing ammonia nitrogen pumped into the first pump body into nitrite; the short-distance nitrification tank is also provided with a third water outlet to output the liquid containing nitrite; the short-distance nitrification tank is also provided with a first monitoring component, the first monitoring component includes a first dissolved oxygen online meter, a first nitrite nitrogen online meter, a first pH online meter and a first temperature online meter; An intermediate blending tank connected to the second water outlet through a second pump body, and the intermediate blending tank is also connected to the third water outlet; the intermediate blending tank is suitable for blending the ratio of nitrite nitrogen and ammonia nitrogen, the concentration of free nitrite and the concentration of free ammonia in the liquid; the intermediate blending tank is provided with a fourth water outlet to output the blended liquid through the fourth water outlet; the intermediate blending tank is also provided with a second monitoring component, and the second monitoring component includes a second dissolved oxygen online meter, a second nitrite nitrogen online meter, a second pH online meter, a second temperature online meter and an ammonia nitrogen online meter; An anaerobic ammonium oxidation tank connected to the fourth water outlet through a third pump body, the anaerobic ammonium oxidation tank is suitable for removing nitrogen generated by the liquid containing ammonia nitrogen and nitrite nitrogen under the action of autotrophic anaerobic ammonium oxidation bacteria; the anaerobic ammonium oxidation tank includes a fifth water outlet and a sixth water outlet, the fifth water outlet is connected to the intermediate blending tank, and the sixth water outlet is used to output the treated liquid; A control component connected to the first pump body, the second pump body, the third pump body, the first monitoring component and the second monitoring component, the control component is used to: Acquire monitoring data collected by the first monitoring component and the second monitoring component; Based on the monitoring data of the first dissolved oxygen online instrument, the oxygen supply of the fan is controlled so that the dissolved oxygen concentration of the short-range nitrification tank is [0.4, 0.7] mg / L; Calculating a first concentration of free nitrite in the short-range nitrification tank based on monitoring data of the first nitrite nitrogen online instrument, the first pH online instrument, and the first temperature online instrument; and controlling the fifth water outlet to be turned on when the first concentration is higher than a first concentration threshold; Based on the monitoring data of the second dissolved oxygen online instrument, the fifth water outlet is controlled to be turned on so that the dissolved oxygen concentration in the intermediate blending tank is [0.4, 0.7] mg / L; Based on the monitoring data of the second nitrite nitrogen online instrument and the ammonia nitrogen online instrument, determine whether the ratio of nitrite nitrogen to ammonia nitrogen in the intermediate blending tank is greater than a set value; when the ratio of nitrite nitrogen to ammonia nitrogen is less than the set value, control the first pump body to start, and control the third water outlet to be connected; when the ratio of nitrite nitrogen to ammonia nitrogen is greater than the set value, control the second pump body to start; Calculate the second concentration of free nitrous acid in the intermediate blending tank based on the monitoring data of the second nitrite nitrogen online instrument, the second pH online instrument and the second temperature online instrument; and control the fifth water outlet to be turned on when the second concentration is higher than the first concentration threshold; Based on the monitoring data of the ammonia nitrogen online instrument, the second pH online instrument and the second temperature online instrument, a third concentration of free ammonia in the intermediate blending tank is calculated; when the third concentration is higher than the second concentration threshold, the fifth water outlet is controlled to be turned on; When the ratio of the nitrite nitrogen to the ammonia nitrogen is the set value, and the first concentration, the second concentration, and the third concentration all meet the preset requirements, the third pump body is controlled to start.

2. The system according to claim 1, characterized in that The system further comprises: a first valve body adapted to control the opening or closing of the first water inlet and a first liquid level controller connected to the first valve body; When the liquid level in the first regulating tank is less than a first liquid level threshold, the first liquid level controller controls the first valve body to open to connect the first water inlet; when the liquid level in the first regulating tank is greater than a second liquid level threshold, the first liquid level controller controls the first valve body to close to shut off the first water inlet, and / or controls the first pump body to start to discharge the liquid in the first regulating tank from the first water outlet.

3. The system according to claim 1, characterized in that The system further comprises: a second valve body adapted to control the opening or closing of the second water inlet and a second liquid level controller connected to the second valve body; When the liquid level in the second regulating tank is less than the third liquid level threshold, the second liquid level controller controls the second valve body to open to connect the second water inlet; when the liquid level in the second regulating tank is greater than the fourth liquid level threshold, the second liquid level controller controls the second valve body to close to shut off the second water inlet, and / or controls the second pump body to start to discharge the liquid in the second regulating tank from the second water outlet.

4. The system according to claim 1, characterized in that The system further includes: a third valve body adapted to control the opening or closing of the third water outlet, wherein the third valve body is connected to the control assembly; accordingly, the control of the opening of the third water outlet includes: The third valve body is controlled to open to connect the third water outlet.

5. The system according to claim 1, characterized in that The system further includes: a fourth valve body adapted to control the opening or closing of the fifth water outlet, wherein the fourth valve body is connected to the control assembly; accordingly, the control of the opening of the fifth water outlet includes: The fourth valve body is controlled to open to connect the fifth water outlet.

6. The system according to claim 1, characterized in that The system further comprises: a third liquid level controller connected to the second pump body and the third pump body respectively; The third liquid level controller controls the second pump to start when the liquid level in the intermediate mixing tank is less than the fifth liquid level threshold; and controls the third pump to start when the liquid level in the intermediate mixing tank is greater than the sixth liquid level threshold.

7. The system according to claim 1, characterized in that The first concentration of free nitrite in the short-range nitrification tank is calculated based on the monitoring data of the first nitrite nitrogen online instrument, the first pH online instrument and the first temperature online instrument, and the second concentration of free nitrite in the intermediate blending tank is calculated based on the monitoring data of the second nitrite nitrogen online instrument, the second pH online instrument and the second temperature online instrument, which are expressed by the following formula: Among them, F NA represents the first concentration or the second concentration, S NO2- represents the concentration of nitrite nitrogen monitored by the first nitrite nitrogen online meter or the second nitrite nitrogen online meter, pH represents the pH value monitored by the first pH online meter or the second pH online meter, and T represents the temperature value monitored by the first temperature online meter or the second temperature online meter.

8. The system according to claim 1, characterized in that The third concentration of free ammonia in the intermediate blending tank is calculated based on the monitoring data of the ammonia nitrogen online instrument, the second pH online instrument and the second temperature online instrument, which is expressed by the following formula: Among them, C FA represents the third concentration, C NH4-N It represents the concentration of ammonia nitrogen monitored by the ammonia nitrogen online instrument, pH represents the pH value monitored by the second pH online instrument, and T represents the temperature value monitored by the second temperature online instrument.

9. The system according to any one of claims 1 to 8, characterized in that: The first concentration threshold is 200 mg / L, the second concentration threshold is 150 mg / L, and the set value is 1.3:1.

Images