Biological tank aeration control method and system

Abstract

The invention discloses a biological tank aeration control method and system. The method comprises the following steps: acquiring current ammonia nitrogen concentration and current dissolved oxygen content collected by each biological tank and parameters set by a user; comparing the current ammonia nitrogen concentration with the ammonia nitrogen upper limit set value and the ammonia nitrogen lower limit set value; if yes, the air blower is controlled to be started, the working time length of the air blower is controlled according to the shortest aeration time, and when the air blower runs, whether the ammonia nitrogen concentration decreasing rates of all the biological tanks are consistent or not or whether the concentrations of all the biological tanks are consistent or not is judged; if yes, adopting a control strategy to control an air inlet valve to control the air inlet amount to adjust the ammonia nitrogen concentration of each biological tank; if yes, the air blower is controlled to stop, and the shutdown duration of the air blower is controlled according to the longest shutdown time. The method can timely, accurately and automatically control the aeration of the biological tank, and reduces the manual workload. And double protection of shortest aeration time and longest shutdown time is set, so that the effluent quality is continuously and stably discharged in a standard reaching manner.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly to a biological pond aeration control method and system. Background Art

[0002] A biological pond is a container for cultivating and maintaining the growth of organisms, and is commonly used in fields such as aquaculture, wastewater treatment, and bioreactors. In these applications, accurately controlling the dissolved oxygen concentration in the biological pond is crucial for maintaining the health and production efficiency of organisms. The aeration system regulation of traditional sewage treatment plant biological ponds overly relies on the experience of technicians and manual operation. There are problems such as low operation and management levels and a lack of professional personnel in many areas, resulting in the inability to adjust the aeration volume of the biological pond in a timely and effective manner, making it difficult to ensure the effluent quality of the sewage treatment plant and achieve benefits. Currently, most sewage treatment plants adjust the aeration volume manually. Due to the implementation of the first-class A discharge standard, in order to ensure that the water quality meets the standard, operators often adopt the method of excessive aeration, which not only leads to a significant increase in power consumption and waste of electric energy. Summary of the Invention

[0003] The purpose of the present invention is to provide a biological pond aeration control method and system, which can accurately and timely control the aeration of the biological pond according to the ammonia nitrogen concentration data and dissolved oxygen data of the biological pond, making the production operation more stable and the effluent quality continuously meet the discharge standard.

[0004] The present invention is achieved through the following technical solutions:

[0005] In a first aspect, a biological pond aeration control method provided by an embodiment of the present invention includes:

[0006] Obtain the current ammonia nitrogen concentration, current dissolved oxygen content collected from each biological pond, and parameters preset by the user, where the parameters include an ammonia nitrogen upper limit set value, an ammonia nitrogen lower limit set value, the shortest aeration time, and the longest shutdown time;

[0007] Compare the current ammonia nitrogen concentration with the set ammonia nitrogen upper limit set value and ammonia nitrogen lower limit;

[0008] If the current ammonia nitrogen concentration is greater than or equal to the ammonia nitrogen upper limit set value, control the blower to start, and control the working duration of the blower according to the shortest aeration time. When the blower is running, determine whether the ammonia nitrogen concentration decline rates of each biological pond are consistent or the concentration levels are consistent. If they are not consistent, adopt a control strategy to control the intake valve to adjust the intake air volume to regulate the ammonia nitrogen concentration of each biological pond;

[0009] If the current ammonia nitrogen concentration is less than the ammonia nitrogen lower limit set value, control the blower to stop, and control the shutdown duration of the blower according to the longest shutdown time.

[0010] Further, the specific method of controlling the intake air volume of the intake valve by using a control strategy to adjust the ammonia nitrogen concentration in each biological pool includes:

[0011] Obtain the current ammonia nitrogen concentration, the target ammonia nitrogen concentration, and the starting ammonia nitrogen concentration, where the starting ammonia nitrogen concentration is the ammonia nitrogen concentration in the biological pool when the blower is turned on;

[0012] Calculate the ammonia nitrogen remaining percentage in each biological pool based on the current ammonia nitrogen concentration, the target ammonia nitrogen concentration, and the starting ammonia nitrogen concentration;

[0013] Calculate the average value of the ammonia nitrogen remaining percentages based on the ammonia nitrogen remaining percentages in each biological pool;

[0014] Obtain the air flow data in each biological pool, calculate the proportion of the air flow in a single biological pool to the total air flow in all biological pools to obtain the actual gas volume proportion of a single biological pool;

[0015] Compare the ammonia nitrogen remaining percentage in each biological pool with the average value of the ammonia nitrogen remaining percentages;

[0016] If the ammonia nitrogen remaining percentage in a biological pool is greater than the average value of the ammonia nitrogen remaining percentages, it indicates that the ammonia nitrogen decline rate in this biological pool is slow. Increase the actual gas volume proportion of this biological pool by a set value to obtain the target gas volume proportion;

[0017] Within the set interval time, compare the actual gas volume proportion of this biological pool with the target gas volume proportion to obtain a comparison result, and control the opening degree of the intake valve according to the comparison result to achieve ammonia nitrogen balance in each biological pool.

[0018] Further, the comparison results include less than and greater than or equal to. If the comparison result is less than, increase the opening degree of the intake valve. If the comparison result is greater than or equal to, decrease the opening degree of the intake valve.

[0019] Further, the calculation formula for calculating the ammonia nitrogen remaining percentage in each biological pool based on the current ammonia nitrogen concentration, the target ammonia nitrogen concentration, and the starting ammonia nitrogen concentration is:

[0020] Ammonia nitrogen remaining percentage = (current ammonia nitrogen concentration - target ammonia nitrogen concentration) × 100 / (starting ammonia nitrogen concentration - target ammonia nitrogen concentration).

[0021] Further, the parameters also include the blower differential pressure protection value. During the process of controlling the opening degree of the intake valve according to the comparison result to achieve ammonia nitrogen balance in each biological pool, obtain the inlet pressure and outlet pressure of the blower, calculate the differential pressure between the inlet and outlet, and compare the differential pressure between the inlet and outlet with the blower differential pressure protection value. When the differential pressure between the inlet and outlet is greater than or equal to the blower differential pressure protection value, automatically increase the valve opening degree until the differential pressure between the inlet and outlet is lower than the blower differential pressure protection value or the valve reaches the maximum opening degree.

[0022] Further, it further includes: during the process of the ammonia nitrogen concentration in a certain biological pond decreasing, when the current dissolved oxygen content is greater than the preset dissolved oxygen content preset value of the biological pond, controlling the intake valve to reduce the opening degree.

[0023] Further, the intake valve includes a main pipe intake valve and a branch pipe intake valve.

[0024] In a second aspect, a biological pond aeration control system provided by an embodiment of the present invention includes: a data acquisition module, a comparison module, and a fan control module;

[0025] The data acquisition module acquires the current ammonia nitrogen concentration, the current dissolved oxygen content collected from each biological pond, and the parameters preset by the user. The parameters include an ammonia nitrogen upper limit set value, an ammonia nitrogen lower limit set value, a shortest aeration time, and a longest shutdown time;

[0026] The comparison module is used to compare the current ammonia nitrogen concentration with the set ammonia nitrogen upper limit set value and ammonia nitrogen lower limit;

[0027] The fan control module is used to control the blower to start when the current ammonia nitrogen concentration is greater than or equal to the ammonia nitrogen upper limit set value, and control the working duration of the blower according to the shortest aeration time. When the blower is running, it judges whether the ammonia nitrogen concentration decrease rates of each biological pond are consistent or the concentration levels are consistent. If not, it controls the intake valve to control the intake air volume to adjust the ammonia nitrogen concentration of each biological pond by using a control strategy; when the current ammonia nitrogen concentration is less than the ammonia nitrogen lower limit set value, it controls the blower to stop and controls the shutdown duration of the blower according to the longest shutdown time.

[0028] Further, the fan control module includes a control unit. The control unit acquires the current ammonia nitrogen concentration, the target ammonia nitrogen concentration, and the starting ammonia nitrogen concentration. The starting ammonia nitrogen concentration is the ammonia nitrogen concentration of the biological pond when the blower is turned on;

[0029] Calculate the ammonia nitrogen remaining percentage of each biological pond according to the current ammonia nitrogen concentration, the target ammonia nitrogen concentration, and the starting ammonia nitrogen concentration;

[0030] Calculate the average value of the ammonia nitrogen remaining percentages according to the ammonia nitrogen remaining percentages of each biological pond;

[0031] Acquire the air flow data in each biological pond, calculate the proportion of the air flow of a single biological pond in the air flow of all biological ponds, and obtain the actual gas volume proportion of a single biological pond;

[0032] Compare the ammonia nitrogen remaining percentages of each biological pond with the average value of the ammonia nitrogen remaining percentages;

[0033] If the ammonia nitrogen remaining percentage in the biological tank is greater than the average value of the ammonia nitrogen remaining percentage, it indicates that the ammonia nitrogen decline rate in this biological tank is slow. Increase the actual gas volume ratio of this biological tank by a set value to obtain the target gas volume ratio.

[0034] Within the set interval time, compare the actual gas volume ratio of this biological tank with the target gas volume ratio to obtain a comparison result, and control the opening degree of the intake valve according to the comparison result so that each biological tank reaches ammonia nitrogen balance.

[0035] Furthermore, the comparison results include less than and greater than or equal to. If the comparison result is less than, increase the opening degree of the intake valve; if the comparison result is greater than or equal to, decrease the opening degree of the intake valve.

[0036] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0037] A biological tank aeration control method and system provided by an embodiment of the present invention. The automatic start and stop of the blower adopt the main control of the ammonia nitrogen concentration in the biological tank and the auxiliary control of the dissolved oxygen content. Automatically control the start and stop of the blower according to the upper and lower limits of the ammonia nitrogen concentration in the biological tank. When the blower is running, if the current ammonia nitrogen decline rates of each biological tank are inconsistent or the current ammonia nitrogen concentrations of each biological tank are inconsistent, the intake valve will be automatically adjusted to control the intake air volume, so that the current ammonia nitrogen decline rates of each biological tank are consistent. In this way, the aeration of the biological tank can be controlled timely, accurately and automatically, making the production operation more stable and reducing the manual workload. By setting double protection of the shortest aeration time and the longest shutdown time, the effluent water quality can be continuously and stably discharged up to the standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts. In the drawings:

[0039] Figure 1 It is a flowchart of a biological tank aeration control method provided by the first embodiment of the present invention;

[0040] Figure 2 It is a structural block diagram of a biological tank aeration control system provided by another embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] To make the purpose, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the embodiments and the drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0042] Example 1

[0043] As Figure 1 shown, a biological pond aeration control method provided by the first embodiment of the present invention is applicable to a biological pond aeration control system provided by the embodiments of the present invention, and includes:

[0044] Obtain the current ammonia nitrogen concentration, current dissolved oxygen content collected from each biological pond, and parameters preset by the user, where the parameters include the ammonia nitrogen upper limit setting value, ammonia nitrogen lower limit setting value, target ammonia nitrogen concentration, shortest aeration time, longest shutdown time, and fan differential pressure protection value;

[0045] Compare the current ammonia nitrogen concentration with the ammonia nitrogen upper limit setting value and the ammonia nitrogen lower limit setting;

[0046] If the current ammonia nitrogen concentration is greater than or equal to the ammonia nitrogen upper limit setting value, control the blower to start, and control the working duration of the blower according to the shortest aeration time. When the blower is running, judge whether the ammonia nitrogen concentration decline rates of each biological pond are consistent or the concentration levels are consistent. If not, adopt a control strategy to control the intake valve to adjust the intake air volume to regulate the ammonia nitrogen concentration of each biological pond;

[0047] If the current ammonia nitrogen concentration is less than the ammonia nitrogen lower limit setting value, control the blower to stop, and control the shutdown duration of the blower according to the longest shutdown time.

[0048] In the biological pond, ammonia nitrogen sensors are used to collect ammonia nitrogen concentrations. The number of ammonia nitrogen sensors can be set to one or more according to actual conditions. When only one sensor is installed, the current ammonia nitrogen concentration, the upper limit set value of ammonia nitrogen, and the lower limit set value of ammonia nitrogen are the ammonia nitrogen concentration data collected by the ammonia nitrogen sensor. When multiple sensors are installed, the current ammonia nitrogen concentration, the upper limit set value of ammonia nitrogen, and the lower limit set value of ammonia nitrogen are the average values obtained by averaging the multiple ammonia nitrogen data collected. In this embodiment, the start and stop of the blower are controlled according to the upper and lower limits of ammonia nitrogen in the biological pond. When the current ammonia nitrogen concentration is greater than or equal to the upper limit set value of ammonia nitrogen, the blower is controlled to start, and the working duration of the blower is controlled according to the shortest aeration time. When the current ammonia nitrogen concentration is less than the lower limit set value of ammonia nitrogen, the blower is controlled to stop, and the shutdown duration of the blower is controlled according to the longest shutdown time. When the blower is running, whether the ammonia nitrogen concentration in the biological pond decreases at a consistent rate or whether the concentration levels are consistent. When they are inconsistent, a control strategy is adopted to control the intake valve to control the intake air volume, so that the ammonia nitrogen concentrations in each biological pond reach equilibrium. The shortest aeration time and the longest shutdown time are set according to the actual production requirements. By setting these two parameters, double protection is provided for the effluent quality, so that the effluent quality continuously and stably meets the discharge standards. The intake valve includes a main pipe intake valve and branch pipe intake valves. The control methods are divided into a main pipe control mode and a branch pipe control mode, and the control method can be selected according to actual needs. When the user selects the main pipe control mode, when the ammonia nitrogen concentration in the biological pond decreases at an inconsistent rate or the concentration levels are inconsistent, the main pipe control mode will automatically adjust the total intake valve of each biological pond, so as to achieve a consistent rate of decrease in the ammonia nitrogen concentration of each biological pond. When the branch pipe control mode is selected, the branch pipe intake valves on each biological pond are automatically adjusted in combination with the auxiliary adjustment of the main pipe intake valve, so as to achieve a consistent rate of decrease in the ammonia nitrogen concentration of each biological pond. In comparison, selecting the branch pipe control mode makes the control more detailed.

[0049] Specifically, the specific method for using a control strategy to control the intake valve to control the intake air volume and adjust the ammonia nitrogen concentration in each biological pond includes:

[0050] Obtain the current ammonia nitrogen concentration, the target ammonia nitrogen concentration, and the initial ammonia nitrogen concentration, where the initial ammonia nitrogen concentration is the ammonia nitrogen concentration in the biological pond when the blower is turned on;

[0051] Calculate the remaining percentage of ammonia nitrogen in each biological pond based on the current ammonia nitrogen concentration, the target ammonia nitrogen concentration, and the initial ammonia nitrogen concentration;

[0052] Calculate the average value of the remaining percentages of ammonia nitrogen based on the remaining percentages of ammonia nitrogen in each biological pond;

[0053] Obtain the air flow data in each biological pond, calculate the proportion of the air flow of a single biological pond in the total air flow of all biological ponds, and obtain the actual gas volume proportion of a single biological pond;

[0054] Compare the ammonia nitrogen remaining percentage of each biological pool with the average value of the ammonia nitrogen remaining percentages.

[0055] If the ammonia nitrogen remaining percentage of a biological pool is greater than the average value of the ammonia nitrogen remaining percentages, it indicates that the ammonia nitrogen decline rate of this biological pool is slow. Increase the actual gas volume ratio of this biological pool by a set value to obtain the target gas volume ratio.

[0056] Within the set interval time, compare the actual gas volume ratio of this biological pool with the target gas volume ratio to obtain a comparison result, and control the opening degree of the intake valve according to the comparison result to achieve ammonia nitrogen balance in each biological pool.

[0057] Among them, the calculation formula for calculating the ammonia nitrogen remaining percentage of each biological pool based on the current ammonia nitrogen concentration, target ammonia nitrogen concentration, and initial ammonia nitrogen concentration is:

[0058] Ammonia nitrogen remaining percentage = (Current ammonia nitrogen concentration - Target ammonia nitrogen concentration) × 100 / (Initial ammonia nitrogen concentration - Target ammonia nitrogen concentration).

[0059] Specifically, when the blower is turned on, record the ammonia nitrogen concentration values of each series in each biological pool at the time of startup as the initial ammonia nitrogen concentration. During a waiting period (temporarily 20 minutes) after the blower is turned on, the system does not make adjustments. After the waiting time, estimate the ammonia nitrogen remaining percentage (PCT) every 15 minutes. The ammonia nitrogen remaining percentage refers to the ratio of the current ammonia nitrogen concentration to the target ammonia nitrogen concentration. For example: When the initial ammonia nitrogen concentration of series 2 at the time of turning on the blower is 7 and the target ammonia nitrogen concentration is 3, and the current ammonia nitrogen concentration of series 2 is 6 at a certain moment, then:

[0060] Ammonia nitrogen remaining percentage = (6 - 3) × 100 / (7 - 3) = 75,

[0061] If its current ammonia nitrogen concentration rises to 8,

[0062] Ammonia nitrogen remaining percentage = (8 - 3) × 100 / (7 - 3) = 125.

[0063] According to the set gas flowmeter, the gas volume in each biological pool can be obtained, and the gas volumes in each biological pool are added to get the total gas volume. The specific calculation method is:

[0064] Total gas volume = Gas volume of #1 + Gas volume of #2 + Gas volume of #3;

[0065] Actual gas volume ratio of #2 = Gas volume of #2 × 100 / Total gas volume.

[0066] Calculate the average value of the ammonia nitrogen remaining percentages of all biological ponds to obtain the average ammonia nitrogen remaining percentage. Compare the ammonia nitrogen remaining percentage of each biological pond with the average ammonia nitrogen remaining percentage. If the ammonia nitrogen remaining percentage of a biological pond is greater than the average ammonia nitrogen remaining percentage, it indicates that the ammonia nitrogen decline rate of this biological pond is relatively slow. Increase the set value of the actual gas volume ratio of this biological pond to obtain the target gas volume ratio; otherwise, decrease the actual gas volume ratio of the biological pond.

[0067] After that, within 15 minutes, compare the actual gas volume ratio of this biological pond with the target gas volume ratio every 2 minutes. If the actual gas volume ratio is less than the target gas volume ratio, increase the opening degree of the intake valve. If the actual gas volume ratio is greater than or equal to the target gas volume ratio, decrease the opening degree of the intake valve, and ensure that the valve opening degree is within the limit values (the lower limit is tentatively set at 25, and the upper limit is 98). In this way, continuously make the ammonia nitrogen remaining removal percentages of each biological pond tend to be average, and make the ammonia nitrogen in each biological pond reach equilibrium.

[0068] During the process of controlling the opening degree of the intake valve according to the comparison result to make each biological pond reach ammonia nitrogen equilibrium, obtain the inlet pressure and outlet pressure of the blower, and calculate the pressure difference between the inlet and outlet. Compare the pressure difference between the inlet and outlet with the blower pressure difference protection value. When the pressure difference between the inlet and outlet is greater than or equal to the blower pressure difference protection value, automatically increase the valve opening degree until the pressure difference between the inlet and outlet is lower than the blower pressure difference protection value or the valve reaches the maximum opening degree. By setting the blower pressure difference protection value, the normal operation of the blower can be protected.

[0069] During the process of the ammonia nitrogen concentration in a certain biological pond decreasing, when it drops to a relatively low level, the current dissolved oxygen content may increase. When the current dissolved oxygen content is greater than the preset dissolved oxygen content preset value of the biological pond, the system will automatically control the intake valve to decrease the opening degree and reduce the actual gas volume ratio of this biological pond, so that the current dissolved oxygen content will not increase too much. In this embodiment, the judgment is made once every 15 minutes.

[0070] A biological pond aeration control method provided by an embodiment of the present invention. The automatic start and stop of the blower adopt the main control of the ammonia nitrogen concentration in the biological pond and the auxiliary control of the dissolved oxygen content. Automatically control the start and stop of the blower according to the upper and lower limits of the ammonia nitrogen concentration in the biological pond. When the blower is running, if the current ammonia nitrogen decline rates of each biological pond are inconsistent or the current ammonia nitrogen concentrations of each biological pond are inconsistent, the intake valve will be automatically adjusted to control the intake air volume, so that the current ammonia nitrogen decline rates of each biological pond are consistent. In this way, the aeration of the biological pond can be controlled timely, accurately, and automatically, making the production operation more stable and reducing the manual workload. By setting the double protection of the shortest aeration time and the longest shutdown time, the effluent water quality can be continuously and stably discharged up to the standard.

[0071] Embodiment 2

[0072] As Figure 2As shown in the figure, a biological pond aeration control system provided by another embodiment of the present invention includes: a data acquisition module, a comparison module, and a blower control module. The data acquisition module acquires the current ammonia nitrogen concentration, the current dissolved oxygen content collected from each biological pond, and the parameters preset by the user. The parameters include the ammonia nitrogen upper limit setting value, the ammonia nitrogen lower limit setting value, the shortest aeration time, and the longest shutdown time. The comparison module is used to compare the current ammonia nitrogen concentration with the set ammonia nitrogen upper limit setting value and ammonia nitrogen lower limit setting. The blower control module is used to control the blower to start when the current ammonia nitrogen concentration is greater than or equal to the ammonia nitrogen upper limit setting value, and control the working duration of the blower according to the shortest aeration time. When the blower is running, it is judged whether the ammonia nitrogen concentration decline rates of each biological pond are consistent or the concentration levels are consistent. If not, a control strategy is adopted to control the intake valve to adjust the intake air volume to regulate the ammonia nitrogen concentration of each biological pond. When the collected ammonia nitrogen concentration is less than the ammonia nitrogen lower limit setting value, the blower is controlled to stop, and the shutdown duration of the blower is controlled according to the longest shutdown time.

[0073] The blower control module includes a control unit, and the control unit acquires the current ammonia nitrogen concentration, the target ammonia nitrogen concentration, and the initial ammonia nitrogen concentration. The initial ammonia nitrogen concentration is the ammonia nitrogen concentration of the biological pond when the blower is turned on.

[0074] Calculate the ammonia nitrogen remaining percentage of each biological pond according to the current ammonia nitrogen concentration, the target ammonia nitrogen concentration, and the initial ammonia nitrogen concentration.

[0075] Calculate the average value of the ammonia nitrogen remaining percentages according to the ammonia nitrogen remaining percentages of each biological pond.

[0076] Acquire the air flow data in each biological pond, calculate the proportion of the air flow of a single biological pond in the total air flow of all biological ponds, and obtain the actual gas volume proportion of a single biological pond.

[0077] Compare the ammonia nitrogen remaining percentage of each biological pond with the average value of the ammonia nitrogen remaining percentages.

[0078] If the ammonia nitrogen remaining percentage of a biological pond is greater than the average value of the ammonia nitrogen remaining percentages, it means that the ammonia nitrogen decline rate of this biological pond is slow. Increase the actual gas volume proportion of this biological pond by a set value to obtain the target gas volume proportion.

[0079] Within the set interval time, compare the actual gas volume proportion of this biological pond with the target gas volume proportion to obtain a comparison result, and control the opening degree of the intake valve according to the comparison result to achieve ammonia nitrogen balance in each biological pond.

[0080] Among them, the comparison results include less than and greater than or equal to. If the comparison result is less than, increase the opening degree of the intake valve. If the comparison result is greater than or equal to, decrease the opening degree of the intake valve.

[0081] A biological pond aeration control system provided by an embodiment of the present invention. The automatic start and stop of the blower adopts the main control of the ammonia nitrogen concentration in the biological pond and the auxiliary control of the dissolved oxygen content. The start and stop of the blower are automatically controlled according to the upper and lower limits of the ammonia nitrogen concentration in the biological pond. When the blower is running, if the current ammonia nitrogen concentration decline rates in each biological pond are inconsistent or the current ammonia nitrogen concentrations in each biological pond are inconsistent, the intake valve will be automatically adjusted to control the intake air volume, so that the current ammonia nitrogen concentration decline rates in each biological pond are consistent. In this way, the aeration of the biological pond can be controlled timely, accurately and automatically, making the production operation more stable and reducing the manual workload. By setting double protections of the shortest aeration time and the longest shutdown time, the effluent water quality can be continuously and stably up to the standard for discharge.

[0082] The specific embodiments described above have further elaborated on the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A biological pond aeration control method, characterized in that: include: Obtain the current ammonia nitrogen concentration, current dissolved oxygen content and parameters preset by the user collected from each biological pool, including the ammonia nitrogen upper limit setting value, the ammonia nitrogen lower limit setting value, the minimum aeration time and the maximum shutdown time; Compare the current ammonia nitrogen concentration with the set ammonia nitrogen upper limit setting value and ammonia nitrogen lower limit setting; If the current ammonia nitrogen concentration is greater than or equal to the ammonia nitrogen upper limit setting value, the blower is controlled to start, and the blower working time is controlled according to the shortest aeration time. When the blower is running, it is determined whether the ammonia nitrogen concentration drop rate of each biological pool is consistent or whether the concentration is consistent. If not, the control strategy is used to control the air intake valve to control the air intake volume to adjust the ammonia nitrogen concentration of each biological pool; If the current ammonia nitrogen concentration is less than the lower limit setting value of ammonia nitrogen, the blower is controlled to stop, and the blower shutdown time is controlled according to the maximum shutdown time.

2. The biological pond aeration control method according to claim 1, characterized in that: The specific method of using the control strategy to control the air intake valve to control the air intake amount and adjust the ammonia nitrogen concentration of each biological pool includes: Obtaining the current ammonia nitrogen concentration, the target ammonia nitrogen concentration and the initial ammonia nitrogen concentration, wherein the initial ammonia nitrogen concentration is the ammonia nitrogen concentration of the biological pool when the blower is turned on; Calculate the remaining percentage of ammonia nitrogen in each biological pool according to the current ammonia nitrogen concentration, the target ammonia nitrogen concentration and the initial ammonia nitrogen concentration; Calculate the mean of the remaining percentage of ammonia nitrogen according to the remaining percentage of ammonia nitrogen in each biological pool; Obtain the air flow data in each biological pool, calculate the proportion of the air flow of a single biological pool to the air flow of all biological pools, and obtain the actual air volume proportion of a single biological pool; Compare the remaining percentage of ammonia nitrogen in each biological pool with the mean remaining percentage of ammonia nitrogen; If the residual percentage of ammonia nitrogen in the biological pool is greater than the average residual percentage of ammonia nitrogen, it means that the ammonia nitrogen in the biological pool decreases slowly. The actual gas volume percentage of the biological pool is increased by the set value to obtain the target gas volume percentage. Within the set interval time, the actual gas volume proportion of the biological pool is compared with the target gas volume proportion to obtain a comparison result, and the opening of the air inlet valve is controlled according to the comparison result to make each biological pool reach ammonia nitrogen balance.

3. The biological pond aeration control method according to claim 2, characterized in that: The comparison result includes less than and greater than or equal to. If the comparison result is less than, the opening of the intake valve is increased; if the comparison result is greater than or equal to, the opening of the intake valve is reduced.

4. The biological pond aeration control method according to claim 2, characterized in that: The calculation formula for calculating the remaining percentage of ammonia nitrogen in each biological pool according to the current ammonia nitrogen concentration, the target ammonia nitrogen concentration and the initial ammonia nitrogen concentration is: The remaining percentage of ammonia nitrogen = (current ammonia nitrogen concentration - target ammonia nitrogen concentration) × 100 / (initial ammonia nitrogen concentration - target ammonia nitrogen concentration).

5. The biological pond aeration control method according to claim 2, characterized in that: The parameters also include a fan pressure difference protection value. In the process of controlling the opening of the air intake valve according to the comparison result to make each biological pool reach ammonia nitrogen balance, the inlet pressure and outlet pressure of the blower are obtained, and the inlet and outlet pressure difference is calculated. The inlet and outlet pressure difference is compared with the fan pressure difference protection value. When the inlet and outlet pressure difference is greater than or equal to the fan pressure difference protection value, the valve opening is automatically increased until the inlet and outlet pressure difference is lower than the fan pressure difference protection value or the valve reaches the maximum opening.

6. The biological pond aeration control method according to claim 2, characterized in that: Also includes: During the process of decreasing ammonia nitrogen concentration in a biological pool, when the current dissolved oxygen content is greater than a preset biological pool dissolved oxygen content preset value, the air inlet valve is controlled to reduce its opening.

7. The biological pond aeration control method according to any one of claims 1 to 6, characterized in that: The air intake valve comprises a main pipe air intake valve and a branch pipe air intake valve.

8. A biological pond aeration control system, characterized in that: include: Data acquisition module, comparison module and fan control module; The data acquisition module acquires the current ammonia nitrogen concentration, the current dissolved oxygen content and the parameters preset by the user collected from each biological pool, wherein the parameters include the upper limit setting value of ammonia nitrogen, the lower limit setting value of ammonia nitrogen, the shortest aeration time and the longest shutdown time; The comparison module is used to compare the current ammonia nitrogen concentration with the set ammonia nitrogen upper limit setting value and the ammonia nitrogen lower limit setting; The fan control module is used to control the blower to start when the current ammonia nitrogen concentration is greater than or equal to the ammonia nitrogen upper limit setting value, and control the blower working time according to the shortest aeration time. When the blower is running, it is determined whether the ammonia nitrogen concentration decrease rate of each biological pool is consistent or whether the concentration is consistent. If not, a control strategy is used to control the air intake valve to control the air intake volume to adjust the ammonia nitrogen concentration of each biological pool; when the current ammonia nitrogen concentration is less than the ammonia nitrogen lower limit setting value, the blower is controlled to stop, and the blower shutdown time is controlled according to the maximum shutdown time.

9. The biological pond aeration control system according to claim 8, characterized in that: The fan control module includes a control unit, which obtains the current ammonia nitrogen concentration, the target ammonia nitrogen concentration and the initial ammonia nitrogen concentration, and the initial ammonia nitrogen concentration is the ammonia nitrogen concentration of the biological pool when the blower is turned on; Calculate the remaining percentage of ammonia nitrogen in each biological pool according to the current ammonia nitrogen concentration, the target ammonia nitrogen concentration and the initial ammonia nitrogen concentration; Calculate the mean of the remaining percentage of ammonia nitrogen according to the remaining percentage of ammonia nitrogen in each biological pool; Obtain the air flow data in each biological pool, calculate the proportion of the air flow of a single biological pool to the air flow of all biological pools, and obtain the actual air volume proportion of a single biological pool; Compare the remaining percentage of ammonia nitrogen in each biological pool with the mean remaining percentage of ammonia nitrogen; If the residual percentage of ammonia nitrogen in the biological pool is greater than the average residual percentage of ammonia nitrogen, it means that the ammonia nitrogen in the biological pool decreases slowly. The actual gas volume percentage of the biological pool is increased by the set value to obtain the target gas volume percentage. Within the set interval time, the actual gas volume proportion of the biological pool is compared with the target gas volume proportion to obtain a comparison result, and the opening of the air inlet valve is controlled according to the comparison result to make each biological pool reach ammonia nitrogen balance.

10. The biological pond aeration control system according to claim 9, characterized in that: The comparison result includes less than and greater than or equal to. If the comparison result is less than, the opening of the intake valve is increased. If the comparison result is greater than or equal to, the opening of the intake valve is reduced.

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