Process control method for short-cut nitrification-anammox treatment of high-ammonia-nitrogen wastewater, electronic device, and medium

Abstract

The application discloses a short-range nitrification-anaerobic ammonia oxidation treatment high ammonia-nitrogen wastewater process control method, an electronic device and a medium. The method can comprise: classifying anaerobic ammonia oxidation reaction process control parameters, determining calculation parameters and control parameters, wherein the control parameter is an ammonia-nitrogen conversion rate; performing slice analysis on a biological pool to obtain node data; calculating the ammonia-nitrogen conversion rate and total nitrogen removal rate through the node data; determining an ammonia-nitrogen conversion rate optimal control point according to the relationship between the ammonia-nitrogen conversion rate and the total nitrogen removal rate, and then determining an ammonia-nitrogen control range. The application can clearly determine the parameter control interval in the actual engineering of short-range nitrification-anaerobic ammonia oxidation treatment high ammonia-nitrogen wastewater, so that the process realizes automatic control, and energy saving and consumption reduction are realized on the basis of ensuring stable operation of the process.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to a process control method, electronic equipment, and medium for short-cut nitrification-anaerobic ammonia oxidation treatment of high ammonia nitrogen wastewater. Background Technology

[0002] High-ammonia nitrogen wastewater, if discharged directly without effective treatment, will cause serious harm to the environment, such as leading to eutrophication of water bodies, affecting the survival of aquatic organisms, and disrupting the ecological balance. Traditional biological nitrogen removal processes (full nitrification-denitrification) have many problems in treating high-ammonia nitrogen wastewater, such as requiring large amounts of aeration that consume high energy, requiring the addition of organic carbon sources that increase costs, and having complex reaction processes and large sludge production.

[0003] Anaerobic ammonia oxidation (ANA) has attracted attention due to its unique advantages. Anaerobic ammonia oxidizing bacteria can directly oxidize ammonia nitrogen to nitrogen gas using nitrite as an electron acceptor under anaerobic conditions, achieving highly efficient nitrogen removal without the need for an external carbon source, resulting in low sludge production, reduced energy consumption, and reduced greenhouse gas emissions. Short-cut nitrification can control ammonia nitrogen oxidation at the nitrite stage, providing the necessary substrate for ANA. This has led to the development of the short-cut nitrification coupled with anaerobic ammonia oxidation (PN / A) process. This process breaks through the theoretical concept of traditional biological nitrogen removal processes, enabling autotrophic nitrogen removal without the need for a carbon source, providing a highly efficient, energy-saving, economical, and environmentally friendly new approach for treating high-ammonia nitrogen wastewater.

[0004] While the short-cut nitrification coupled with anaerobic ammonium oxidation (PN / A) process offers numerous advantages, its operation and control are complex. This process involves two steps: short-cut nitrification and anaerobic ammonium oxidation, requiring stringent control of operating conditions such as temperature, pH, dissolved oxygen (DO), and sludge age. In practice, DO control is particularly challenging. Short-cut nitrification requires a certain amount of dissolved oxygen for ammonia nitrogen oxidation, but excessively high dissolved oxygen levels can inhibit anaerobic ammonium oxidation. Therefore, achieving precise dissolved oxygen control—producing an appropriate amount of nitrite during short-cut nitrification to provide sufficient substrate for anaerobic ammonium oxidation while simultaneously avoiding its inhibition—is a significant challenge.

[0005] Currently, there is a need to develop a process control method for short-cut nitrification-anaerobic ammonia oxidation to treat high ammonia nitrogen wastewater.

[0006] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] This invention proposes a process control method, electronic equipment, and medium for short-cut nitrification-anaerobic ammonia oxidation treatment of high ammonia nitrogen wastewater. It can clearly define the parameter control range in actual engineering of short-cut nitrification-anaerobic ammonia oxidation treatment of high ammonia nitrogen wastewater, enabling automated process control and achieving energy saving and consumption reduction while ensuring stable operation of the process.

[0008] In a first aspect, embodiments of this disclosure provide a method for controlling a short-cut nitrification-anaerobic ammonia oxidation process for treating high-ammonia nitrogen wastewater, including: The process control parameters for anaerobic ammonia oxidation are classified, and the calculated parameters and control parameters are determined. Among them, the control parameter is the ammonia nitrogen conversion rate. The biological pool was sliced ​​and analyzed to obtain data for each node; Ammonia nitrogen conversion rate and total nitrogen removal rate were calculated using node data. The optimal control point for ammonia nitrogen conversion rate is determined based on the relationship between ammonia nitrogen conversion rate and total nitrogen removal rate, thereby determining the ammonia nitrogen control range.

[0009] Preferably, the process control parameters for anaerobic ammonia oxidation include internal reflux, external reflux, dilution water, temperature, nitrite, nitrate nitrogen, ammonia nitrogen, dissolved oxygen (DO), alkalinity, and sludge concentration in the biological tank.

[0010] Preferably, the calculation parameters include nitrite, nitrate nitrogen, and ammonia nitrogen.

[0011] Preferably, the biological pool is sliced ​​for analysis to obtain data for each node, including: If the biological tank is divided into m sections according to its corridor or length, then the detection points are set at the initial section m0, the section points, and the effluent section m. m+1 ; Obtain the levels of nitrite, nitrate nitrogen, and ammonia nitrogen at each testing point.

[0012] Preferably, the ammonia nitrogen conversion rate is:

[0013] in, This represents the total nitrogen at the nth detection point. Represents the total nitrogen at n+1 detection points. Represents nitrite at n+1 detection points. This represents the nitrite at the nth detection point. This represents the ammonia nitrogen at the nth detection point. , This represents the nitrogen nitrate at the nth detection point.

[0014] Preferably, the total nitrogen removal rate is:

[0015] in, This represents the total nitrogen at the nth detection point. This represents the total nitrogen at n+1 detection points.

[0016] Preferably, the optimal control point for ammonia nitrogen conversion rate is determined based on the relationship between ammonia nitrogen conversion rate and total nitrogen removal rate, and the ammonia nitrogen control range is then determined, including: Calculate the ammonia nitrogen conversion rate between two adjacent detection points. When the ammonia nitrogen at point n is above 100 mg / L, it is graded according to the gradient. The control range of ammonia nitrogen conversion rate from n to n+1 at different ammonia nitrogen concentrations at point n is determined by the relationship between the ammonia nitrogen conversion rate and the total nitrogen removal rate in this range.

[0017] Secondly, embodiments of this disclosure also provide an electronic device, the electronic device comprising: Memory, which stores executable instructions; A processor that executes the executable instructions in the memory to implement the short-range nitrification-anaerobic ammonia oxidation process control method for treating high ammonia nitrogen wastewater.

[0018] Thirdly, embodiments of this disclosure also provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the aforementioned short-range nitrification-anaerobic ammonia oxidation process control method for treating high-ammonia nitrogen wastewater.

[0019] Its beneficial effects are as follows: (1) Using the key control parameter ammonia nitrogen conversion rate to analyze the total nitrogen removal efficiency of anaerobic ammonia oxidation can clarify the range of ammonia nitrogen that each control node should control under different influent ammonia nitrogen loads. It is highly practical and has a wide range of applications. (2) Combined with the ammonia nitrogen precision aeration system, the process of short-cut nitrification-anaerobic ammonia oxidation to treat high ammonia nitrogen wastewater can be automated, which solves the problem of high operation difficulty and complex control parameters of the short-cut nitrification-anaerobic ammonia oxidation to treat high ammonia nitrogen wastewater.

[0020] The methods and apparatus of the present invention have other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and following detailed description, which together serve to explain the particular principles of the invention. Attached Figure Description

[0021] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same parts.

[0022] Figure 1A flowchart illustrating the steps of a short-cut nitrification-anaerobic ammonia oxidation process control method for treating high ammonia nitrogen wastewater according to an embodiment of the present invention is shown.

[0023] Figure 2 A schematic diagram of an anaerobic ammonia oxidation biological tank according to an embodiment of the present invention is shown.

[0024] Figure 3 A schematic diagram showing the ammonia nitrogen conversion rates corresponding to different influent ammonia nitrogen levels according to an embodiment of the present invention is provided. Detailed Implementation

[0025] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0026] Figure 1 A flowchart illustrating the steps of a short-cut nitrification-anaerobic ammonia oxidation process control method for treating high ammonia nitrogen wastewater according to an embodiment of the present invention is shown.

[0027] like Figure 1 As shown, the process control method for short-cut nitrification-anaerobic ammonia oxidation to treat high ammonia nitrogen wastewater includes: Step 101: Classify the control parameters of the anaerobic ammonia oxidation reaction process, and determine the calculation parameters and control parameters, wherein the control parameter is the ammonia nitrogen conversion rate; Step 102: Perform slice analysis on the biological pool to obtain data for each node; Step 103: Calculate the ammonia nitrogen conversion rate and total nitrogen removal rate using node data; Step 104: Determine the optimal control point for ammonia nitrogen conversion rate based on the relationship between ammonia nitrogen conversion rate and total nitrogen removal rate, and then determine the ammonia nitrogen control range.

[0028] In one example, the process control parameters for anaerobic ammonia oxidation include internal reflux, external reflux, dilution water, temperature, nitrite, nitrate nitrogen, ammonia nitrogen, dissolved oxygen (DO), alkalinity, and sludge concentration in the biological tank.

[0029] In one example, the calculated parameters include nitrite, nitrate nitrogen, and ammonia nitrogen.

[0030] In one example, a slice analysis of the biological pool yields data for each node, including: If the biological tank is divided into m sections according to its corridor or length, then the detection points are set at the initial section m0, the section points, and the effluent section m. m+1 ; Obtain the levels of nitrite, nitrate nitrogen, and ammonia nitrogen at each testing point.

[0031] In one example, the ammonia nitrogen conversion rate is:

[0032] in, This represents the total nitrogen at the nth detection point. Represents the total nitrogen at n+1 detection points. Represents nitrite at n+1 detection points. This represents the nitrite at the nth detection point. This represents the ammonia nitrogen at the nth detection point. , This represents the nitrogen nitrate at the nth detection point.

[0033] In one example, the total nitrogen removal rate is:

[0034] in, This represents the total nitrogen at the nth detection point. This represents the total nitrogen at n+1 detection points.

[0035] In one example, the optimal control point for ammonia nitrogen conversion rate is determined based on the relationship between ammonia nitrogen conversion rate and total nitrogen removal rate, and thus the control range for ammonia nitrogen is determined as follows: Calculate the ammonia nitrogen conversion rate between two adjacent detection points. When the ammonia nitrogen at point n is above 100 mg / L, it is graded according to the gradient. The control range of ammonia nitrogen conversion rate from n to n+1 at different ammonia nitrogen concentrations at point n is determined by the relationship between the ammonia nitrogen conversion rate and the total nitrogen removal rate in this range.

[0036] Specifically, the process control parameters for anaerobic ammonia oxidation are categorized, and the ammonia-nitrogen conversion rate is identified as the key control parameter.

[0037] The process control parameters for short-cut nitrification-anaerobic ammonia oxidation (ATO) treatment of high ammonia nitrogen wastewater include: internal reflux, external reflux, dilution water, temperature, nitrite, nitrate nitrogen, ammonia nitrogen, dissolved oxygen (DO), alkalinity, and sludge concentration in the biological tank. Internal reflux, external reflux, and dilution water are primarily used to control the ammonia nitrogen concentration at the inlet of the biological tank. Ammonia nitrogen, DO, alkalinity, and sludge concentration in the biological tank primarily control the nitrite concentration, which is crucial for short-cut nitrification. Temperature, nitrite concentration, and nitrate nitrogen concentration primarily control the anaerobic ammonia oxidation reaction. Therefore, the above analysis shows that the occurrence of the short-cut nitrification-anaerobic ammonia oxidation reaction mainly depends on temperature, ammonia nitrogen, and nitrite concentration. In actual process control, temperature is relatively easy to control within a reasonable range; therefore, the focus of actual engineering control is on controlling ammonia nitrogen and nitrite concentrations.

[0038] Ideally, ammonia nitrogen and nitrite react in a 1:1.32 ratio to remove ammonia nitrogen. This means that when only ammonia nitrogen is present in the influent, 1.32 / 2.32 of the ammonia nitrogen needs to be converted to nitrite to remove all ammonia nitrogen. However, in actual reactions, nitrite concentration inhibits the anaerobic ammonia oxidation reaction, and the inhibitory concentration is not uniformly determined in the literature. Therefore, a control range cannot be obtained through theoretical calculations. Assuming normal bacterial populations in the biological tank, the total nitrogen removal rate will initially increase and then decrease as the proportion of ammonia nitrogen converted to nitrite (ammonia nitrogen conversion rate) increases. If the inhibitory effect of nitrite and biological activity are not considered, the highest point should be 0.57 (1.32 / 2.32). Therefore, the optimal control range for ammonia nitrogen and nitrite can be determined by analyzing the ammonia nitrogen conversion rate and the total nitrogen removal rate.

[0039] Slice analysis was performed on the biological treatment pond to obtain data for each node. The biological treatment pond was divided into m slices (denoted as m1, m2, etc.) according to corridors or lengths for the short-cut nitrification-anaerobic ammonia oxidation process control of high ammonia nitrogen wastewater. m If m+2 detection points are set, they will be set at the initial section m0 of the biological tank, the slicing point, and the effluent section m. m+1 The detection indicators are ammonia nitrogen, nitrite, and nitrate nitrogen. The total nitrogen at the nth detection point is calculated as follows:

[0040] The formula for calculating the ammonia nitrogen conversion rate from the nth monitoring point to the (n+1)th monitoring point is:

[0041] The formula for calculating the total nitrogen removal rate from the nth monitoring point to the (n+1)th monitoring point is:

[0042] in, This represents the total nitrogen at the nth detection point. Represents the total nitrogen at n+1 detection points. Represents nitrite at n+1 detection points. This represents the nitrite at the nth detection point. This represents the ammonia nitrogen at the nth detection point. This represents the nitrogen content at the nth detection point. This represents the nitrogen content at n+1 detection points. This represents the ammonia nitrogen at n+1 detection points.

[0043] The ammonia nitrogen conversion rate between two adjacent detection points can be calculated using the above formula. The relationship between the ammonia nitrogen conversion rate and the total nitrogen removal rate within this interval determines the control range of the ammonia nitrogen conversion rate from n to n+1 at different ammonia nitrogen concentrations at point n (gradient grading is not required when ammonia nitrogen at point n is below 100 mg / L). When ammonia nitrogen at point n is above 100 mg / L, gradient grading is required, with the gradient range set between 50-100 mg / L. After grading, the relationship between the ammonia nitrogen conversion rate and the total nitrogen removal rate within the range of n to n+1 is analyzed separately. The results are then merged and categorized. If the ammonia nitrogen concentrations within the range of 100-250 mg / L show a consistent pattern, they are grouped into the same range.

[0044] The present invention also provides an electronic device, comprising: a memory storing executable instructions; and a processor that executes the executable instructions in the memory to implement the above-described short-range nitrification-anaerobic ammonia oxidation process control method for treating high ammonia nitrogen wastewater.

[0045] The present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described short-range nitrification-anaerobic ammonia oxidation process control method for treating high ammonia nitrogen wastewater.

[0046] To facilitate understanding of the solutions and effects of the embodiments of the present invention, three specific application examples are given below. Those skilled in the art should understand that these examples are merely for the purpose of understanding the present invention, and any specific details therein are not intended to limit the present invention in any way.

[0047] Example 1

[0048] Figure 2 A schematic diagram of an anaerobic ammonia oxidation biological tank according to an embodiment of the present invention is shown.

[0049] Figure 2 The anaerobic ammonia oxidation biological reactor is divided into five channels (1, 2, 3, 4, and 5) from top to bottom, indicated by blue arrows representing water flow direction. The ammonia nitrogen conversion rate, a key control parameter defined in this disclosure, is used to perform a segmental analysis of the anaerobic ammonia oxidation biological reactor.

[0050] Sampling points were set up at the ends of corridors 1, 3, and 5 to test ammonia nitrogen, nitrite, and nitrate nitrogen. The original biological treatment tank was divided into two categories based on the total nitrogen removal efficiency: corridors 1-3 and corridors 3-5.

[0051] Taking corridors 1-3 as an example, the formula for calculating the ammonia nitrogen conversion rate is:

[0052] in, Represents the total nitrogen in corridor 1. Represents the total nitrogen in the three corridors. Represents nitrite from corridor 3. Represents nitrite in corridor 1. Represents ammonia nitrogen in corridor 1. Represents nitrate nitrogen in corridor 1. Represents nitrate and nitrogen in corridor 3. Represents ammonia nitrogen in corridor 3.

[0053] When ammonia nitrogen is <250 mg / L, the ammonia nitrogen conversion rate exceeds 33%, the TN removal rate decreases, and the ammonia nitrogen substrate is insufficient.

[0054] like Figure 3 As shown, when the influent ammonia nitrogen in Channel 1 is ≥600 mg / L, total nitrogen increases with the increase of ammonia nitrogen conversion rate, but the ammonia nitrogen conversion rate is basically <20%, which is due to the inhibition of short-cut nitrification by free ammonia nitrogen. When the influent ammonia nitrogen in Channel 1 is 400-600 mg / L, the ammonia nitrogen conversion rate exceeds 30%, and the TN removal rate decreases, possibly due to the inhibition of anaerobic ammonia oxidation by nitrite. When the influent ammonia nitrogen in Channel 1 is 250-400 mg / L, the higher the ammonia nitrogen conversion rate, the higher the total nitrogen removal rate. When ammonia nitrogen is <250 mg / L, the ammonia nitrogen conversion rate exceeds 33%, the TN removal rate decreases, and the ammonia nitrogen substrate is insufficient. The control strategies are summarized in Table 1.

[0055] Table 1

[0056] Example 2

[0057] This disclosure provides an electronic device, comprising: a memory storing executable instructions; and a processor executing the executable instructions in the memory to implement the above-described short-range nitrification-anaerobic ammonia oxidation process control method for treating high ammonia nitrogen wastewater.

[0058] An electronic device according to an embodiment of the present disclosure includes a memory and a processor.

[0059] This memory is used to store non-transitory computer-readable instructions. Specifically, the memory may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may, for example, include random access memory (RAM) and / or cache memory. The non-volatile memory may, for example, include read-only memory (ROM), hard disk, flash memory, etc.

[0060] The processor may be a central processing unit (CPU) or other form of processing unit with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions. In one embodiment of this disclosure, the processor is used to execute computer-readable instructions stored in the memory.

[0061] Those skilled in the art will understand that, in order to solve the technical problem of how to achieve a good user experience, this embodiment may also include well-known structures such as communication buses and interfaces, and these well-known structures should also be included within the protection scope of this disclosure.

[0062] For a detailed description of this embodiment, please refer to the corresponding descriptions in the foregoing embodiments, which will not be repeated here.

[0063] Example 3

[0064] This disclosure provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the aforementioned short-range nitrification-anaerobic ammonia oxidation process control method for treating high-ammonia nitrogen wastewater.

[0065] A computer-readable storage medium according to embodiments of the present disclosure stores non-transitory computer-readable instructions. When these non-transitory computer-readable instructions are executed by a processor, all or part of the steps of the methods described in the foregoing embodiments of the present disclosure are performed.

[0066] The aforementioned computer-readable storage media include, but are not limited to: optical storage media (e.g., CD-ROM and DVD), magneto-optical storage media (e.g., MO), magnetic storage media (e.g., magnetic tape or portable hard drive), media with built-in rewritable non-volatile memory (e.g., memory card), and media with built-in ROM (e.g., ROM cartridge).

[0067] Those skilled in the art should understand that the above description of the embodiments of the present invention is only intended to illustrate the beneficial effects of the embodiments of the present invention, and is not intended to limit the embodiments of the present invention to any of the examples given.

[0068] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for controlling a short-cut nitrification-anaerobic ammonia oxidation process for treating high-ammonia nitrogen wastewater, characterized in that, include: The control parameters of the anaerobic ammonia oxidation reaction process are classified and the calculated parameters and control parameters are determined. The control parameter is the ammonia nitrogen conversion rate, and the calculated parameters include nitrite, nitrate nitrogen and ammonia nitrogen. The biological treatment pond is sliced ​​for analysis to obtain data at each node. This includes establishing m slices of the biological treatment pond according to corridors or lengths, with monitoring points set at the initial segment m0, the slice points, and the effluent segment m. m+1 ; Obtain the levels of nitrite, nitrate nitrogen, and ammonia nitrogen at each testing point; The ammonia nitrogen conversion rate and total nitrogen removal rate were calculated using node data. The ammonia nitrogen conversion rate was: Total nitrogen removal rate: in, This represents the total nitrogen at the nth detection point. Represents the total nitrogen at n+1 detection points. Represents nitrite at n+1 detection points. This represents the nitrite at the nth detection point. This represents the ammonia nitrogen at the nth detection point. , This represents the nitrogen content at the nth detection point; The optimal control point for ammonia nitrogen conversion rate is determined based on the relationship between ammonia nitrogen conversion rate and total nitrogen removal rate, and then the control range for ammonia nitrogen is determined. This includes: calculating the ammonia nitrogen conversion rate between two adjacent detection points; when the ammonia nitrogen at point n is above 100 mg / L, it is graded according to a gradient; and determining the control range for ammonia nitrogen conversion rate from n to n+1 at different ammonia nitrogen concentrations at point n by using the relationship between ammonia nitrogen conversion rate and total nitrogen removal rate within this range.

2. The process control method for short-cut nitrification-anaerobic ammonia oxidation treatment of high ammonia nitrogen wastewater according to claim 1, wherein, The process control parameters for anaerobic ammonia oxidation include internal reflux, external reflux, dilution water, temperature, nitrite, nitrate nitrogen, ammonia nitrogen, dissolved oxygen (DO), alkalinity, and sludge concentration in the biological tank.

3. An electronic device, characterized in that, The electronic device includes: Memory, which stores executable instructions; A processor that executes the executable instructions in the memory to implement the short-range nitrification-anaerobic ammonia oxidation process control method for treating high ammonia nitrogen wastewater as described in claim 1 or 2.

4. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the process control method for short-range nitrification-anaerobic ammonia oxidation treatment of high ammonia nitrogen wastewater as described in claim 1 or 2.

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