A method and system for controlling the equalization of water distribution in an open channel

Abstract

The present application relates to a kind of open channel water distribution equalization control method and system, method includes: according to the maximum water inflow, the total water inflow of total water inflow range is pre-set;All biological treatment units are divided into the fixed water amount group of control water inflow and the free water amount group of not control water inflow;When the water inflow of free water amount group and the water inflow of fixed water amount group reach preset condition, judge the total water inflow range of current needs adjustment and adjust the total water inflow range of current, then adjust the water inflow of fixed water amount group.The setting of group, make part of filter's water inflow be controlled according to total water inflow, then by adjusting the total water inflow range, get the most suitable water distribution mode, when not set total water inflow flow metering equipment in the biological treatment unit in sewage treatment facility, can be realized by the control logic through open channel water distribution mode to each biological treatment unit for more balanced water distribution purpose, finally guarantee the load balance of each biological treatment unit when running.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of open channel water distribution, in particular to an open channel water distribution balance control method and system. BACKGROUND

[0002] The biological filter process section is composed of 14 groups of biological filter units. The total influent is lifted by a lifting pump into a central influent channel, and then distributed to each biological filter unit from the central influent channel. An adjusting valve and an influent flow meter are installed on the influent pipe of each group of biological filter units, but no water metering device is installed in the total influent channel. Therefore, the total influent information cannot be accurately obtained, and the influent of each biological filter unit cannot be effectively controlled in actual control, and there is a great possibility of overflow accident of the water level in the central influent channel

[0003] When there is no condition to install a total influent flow meter, the total influent of the sewage treatment process section is distributed through a public open channel, and the distribution needs to be evenly distributed to each biological treatment unit in the process section. Since there is no measurement of the total influent, the distribution amount cannot be instructed to the influent adjusting valve of each biological treatment unit, that is, the influent amount of each biological treatment unit loses the control means. This not only causes the treatment load of each biological treatment unit in the sewage treatment process section to be uneven, but also causes the liquid level in the public open channel to be uncontrollable, which is prone to cause overflow accident of the distribution channel. SUMMARY

[0004] The present application provides an open channel water distribution balance control method and system to solve the above problems in the prior art.

[0005] An open channel water distribution balance control method, comprising the following steps:

[0006] Pre-set a total influent amount range of the total influent amount according to the maximum influent amount;

[0007] Divide all biological treatment units into a fixed water amount group for controlling the influent amount and a free water amount group for not controlling the influent amount;

[0008] When the influent amount of the free water amount group and the influent amount of the fixed water amount group reach a preset condition, it is judged that the current total influent amount range needs to be adjusted, the current total influent amount range is adjusted, and then the influent amount of the fixed water amount group is adjusted;

[0009] The total influent amount range controls the influent amount of each biological treatment unit in the fixed water amount group.

[0010] By adopting the technical scheme, the fixed water amount group is adjusted according to the total water inflow grade, the water inflow of the fixed water amount group is limited, and thus the whole water inflow is controlled; when the situation changes, the total water inflow grade is adjusted according to the water inflow of the free water amount group and the fixed water amount group, and the fixed water inflow group is adjusted according to the judgment result, so as to achieve the purpose of adjusting the water inflow in the whole device.

[0011] Optionally, the total water inflow grade comprises:

[0012] a low water inflow grade, which is set to be less than or equal to 40% of the maximum water inflow;

[0013] a medium water inflow grade, which is set to be greater than 40% of the maximum water inflow and less than or equal to 60% of the maximum water inflow;

[0014] a high water inflow grade, which is set to be greater than 60% of the maximum water inflow and less than or equal to 80% of the maximum water inflow;

[0015] a full water inflow grade, which is set to be greater than 80% of the maximum water inflow and less than or equal to 100% of the maximum water inflow;

[0016] an extreme water inflow grade, which is set to be greater than 120% of the maximum water inflow.

[0017] By adopting the technical scheme, the water inflow is divided according to the drainage situation that may be encountered in actual application, and then different operation processes are performed; when an emergency period is encountered, such as rainfall or flood drainage demand, the water inflow is very large at this time, and the extreme water inflow grade is set for special processing.

[0018] Optionally, the fixed water amount group comprises: a group of biological treatment units, and the free water amount group comprises: a group of biological treatment units, wherein X represents the number of biological treatment units in the sewage treatment facility.

[0019] By adopting the technical scheme, the fixed water amount group is set with two more groups than the free water amount group, so that the control and adjustment of the water inflow by the fixed water amount group are more effective, and the effect of the free water amount group is not affected.

[0020] Optionally, the control of the water inflow of each biological treatment unit in the fixed water amount group according to the total water inflow grade comprises:

[0021] when the low water inflow grade, the water inflow of each biological treatment unit in the fixed water amount group is controlled to be 0.4×Q / Xm 3 / h;

[0022] when the medium water inflow grade, the water inflow of each biological treatment unit in the fixed water amount group is controlled to be 0.6×Q / Xm 3 / h;

[0023] In the high flow range, the water inflow of each biological treatment unit in the fixed water amount group is controlled at 0.8*Q / Xm 3 / h;

[0024] In the full water amount range, the water inflow of each biological treatment unit in the fixed water amount group is controlled at Q / Xm 3 / h;

[0025] In the extreme water amount range, the opening degree of the regulating valve of each biological treatment unit in the fixed water amount group is kept at 100%.

[0026] Q represents the maximum water inflow of the sewage treatment facility, and X represents the number of biological treatment units in the sewage treatment facility.

[0027] Optionally, the preset condition includes a first preset condition and a second preset condition,

[0028] The first preset condition is that the maximum water inflow in the free water amount group is greater than 1.2 times the water amount set value of the fixed water amount group at the same time, and the duration exceeds a preset time, at which time the total water inflow range is reduced.

[0029] The second preset condition is that the maximum water inflow in the free water amount group is less than 0.8 times the water amount set value of the fixed water amount group at the same time, and the duration exceeds a preset time, at which time the total water inflow range is increased.

[0030] By adopting the above technical solution, it can be judged that the water inflow is greater than the current bearing condition or the water inflow is less than the current bearing condition, and the fixed water amount group needs to be adjusted to change the water inflow limit of the entire device, so that the device matches the current real water inflow.

[0031] Optionally, the deviation range of the water inflow of the free water amount group is controlled by changing the preset condition value for adjusting the water inflow, and the corresponding control range interval is:

[0032]

[0033] Among them, SH represents the preset condition value, and X represents the number of biological treatment units in the sewage treatment facility.

[0034] By adopting the above technical solution, the range of acceptable water amount fluctuations is retained, and the condition of being judged as adjustment due to slight water amount fluctuations is avoided.

[0035] Optionally, after each standard backwashing is completed, the fixed water amount group and the free water amount group are switched with each other.

[0036] By adopting the technical scheme, part of the filter tank is avoided from being in a low load or high load state for a long time, and stable overall system operation is ensured.

[0037] An open channel water distribution balance control system comprises:

[0038] A total water inflow amount range setting module sets a total water inflow amount range of the total water inflow amount according to the maximum water inflow amount;

[0039] A filter tank control module divides all biological treatment units into a fixed water amount group for which water inflow amount is controlled and a free water amount group for which water inflow amount is not controlled;

[0040] A water inflow amount adjustment module, when the water inflow amount of the free water amount group and the water inflow amount of the fixed water amount group reach a preset condition, judges that the current total water inflow amount range needs to be adjusted and adjusts the current total water inflow amount range, and then adjusts the water inflow amount of the fixed water amount group;

[0041] The total water inflow amount range controls the water inflow amount of each biological treatment unit in the fixed water amount group.

[0042] Optionally, the total water inflow amount range comprises:

[0043] A low flow range is set to be less than or equal to 40% of the maximum water inflow amount;

[0044] A medium flow range is set to be greater than 40% of the maximum water inflow amount and less than or equal to 60% of the maximum water inflow amount;

[0045] A high flow range is set to be greater than 60% of the maximum water inflow amount and less than or equal to 80% of the maximum water inflow amount;

[0046] A full water amount range is set to be greater than 80% of the maximum water inflow amount and less than or equal to 100% of the maximum water inflow amount;

[0047] An extreme water amount range is set to be greater than 120% of the maximum water inflow amount.

[0048] Optionally, the control of the water inflow amount of each biological treatment unit in the fixed water amount group according to the total water inflow amount range comprises:

[0049] When the low flow range, the water inflow amount of each biological treatment unit in the fixed water amount group is controlled to be 0.4×Q / X m 3 / h;

[0050] When the medium flow range, the water inflow amount of each biological treatment unit in the fixed water amount group is controlled to be 0.6×Q / X m 3 / h;

[0051] When the high flow range, the water inflow amount of each biological treatment unit in the fixed water amount group is controlled to be 0.8×Q / X m 3 / h;

[0052] At the full water amount stage, the water amount control of each biological treatment unit in the fixed water amount group is controlled at Q / X m 3 / h;

[0053] At the extreme water amount stage, the opening degree of the water amount regulating valve of each biological treatment unit in the fixed water amount group is kept at 100%.

[0054] Q represents the maximum water inflow amount of the sewage treatment facility, and X represents the number of biological treatment units of the sewage treatment facility.

[0055] In summary, by setting the fixed water amount group and the free water amount group, the water inflow amount of part of the filter tank is controlled according to the total water inflow amount, and then by adjusting the total water inflow amount stage, the most suitable water distribution mode is obtained. When the total water inflow amount metering device is not set in the biological treatment unit of the sewage treatment facility, the control logic can realize the purpose of balanced water distribution of each biological treatment unit through the open channel water distribution mode, and finally ensure the load balance of each biological treatment unit during operation. BRIEF DESCRIPTION OF DRAWINGS

[0056] Figure 1 It is a structural diagram of the open channel water distribution device in the prior art;

[0057] Figure 2 It is a flow chart of the control method of the open channel water distribution balance in the application;

[0058] Figure 3 It is a specific flow chart of the control method of the open channel water distribution balance in the application; Figure 2

[0059] Figure 4 It is a structural diagram of the control system of the open channel water distribution balance in the application. DETAILED DESCRIPTION

[0060] In order to make the purposes, technical solutions and advantages of the application clearer, the application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0061] The terms used in the embodiments of the application are only for the purpose of describing the specific embodiments, and are not intended to limit the application. The singular forms "a", "said" and "the" used in the embodiments of the application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Multiple" generally includes at least two.

[0062] ​It should be understood that the term "and / or" as used herein merely describes an associated relationship, that is, there can be three cases, for example, A and / or B, which can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0063] It should be understood that although the terms first, second, third, etc. can be used in embodiments of the present application to describe various elements, these descriptions should not be limited to these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of embodiments of the present application, first can also be referred to as second, and similarly, second can also be referred to as first.

[0064] Depending on the context, the word "if" as used herein can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if it is determined" or "if (a stated condition or event) is detected" can be interpreted as "when it is determined" or "in response to determining" or "when (a stated condition or event) is detected" or "in response to detecting (a stated condition or event)".

[0065] It should also be noted that the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusions, so that a product or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such product or device. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of another identical element in the product or device comprising the element.

[0066] It should be particularly noted that the symbols and / or numbers present in the specification, if not marked in the description, are not the figure marks.

[0067] The optional embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0068] The embodiments provided by the present application are an embodiment of a method for controlling open channel water distribution balance.

[0069] The embodiments of the present application will be described in detail below with reference to the accompanying drawings. Figures 1-3 The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0070] Reference will be made to Figure 1The prior art open channel device includes a cuboid channel-shaped water channel, two corresponding biological treatment units arranged on the water channel, a unit adjusting valve and a flow meter arranged at the biological treatment unit, and a water inlet arranged in the water channel in a direction perpendicular to the water outlet direction. In application, water is introduced through the water inlet, and then the water is discharged after being treated by the biological treatment unit. The current unit adjusting valve and flow meter can only adjust the water quantity at the current biological treatment unit. No water quantity measuring device is installed in the water channel, and the total water inlet quantity information cannot be accurately obtained.

[0071] Referring to Figure 2 and Figure 3 An open channel water distribution balancing control method, comprising the following steps:

[0072] Step S100, a total water inlet quantity range of total water inlet quantity is preset according to the maximum water inlet quantity; the total water inlet quantity range is set according to the possible situations in actual application.

[0073] The total water inlet quantity range includes:

[0074] A low flow range (L) is set to be less than or equal to 40% of the maximum water inlet quantity;

[0075] A medium flow range (M) is set to be greater than 40% of the maximum water inlet quantity and less than or equal to 60% of the maximum water inlet quantity;

[0076] A high flow range (H) is set to be greater than 60% of the maximum water inlet quantity and less than or equal to 80% of the maximum water inlet quantity;

[0077] A full water range (F) is set to be greater than 80% of the maximum water inlet quantity and less than or equal to 100% of the maximum water inlet quantity; in actual application, when the water inlet quantity exceeds 100% of the maximum water inlet quantity but has not reached the extreme water range, it is treated as the full water range.

[0078] An extreme water range (S) is set to be greater than 120% of the maximum water inlet quantity, for example, when there is rainfall or flood discharge demand during the emergency period, the situation is separately divided into a range, which is convenient for emergency treatment and avoids damage to the water channel caused by delayed detection of water quantity by the biological treatment unit.

[0079] Step S200, all biological treatment units are divided into a fixed water quantity group (GF) for controlling water inlet quantity and a free water quantity group (GA) without controlling water inlet quantity; wherein the total water inlet quantity range controls the water inlet quantity of each biological treatment unit in the fixed water quantity group, which includes:

[0080] When the low flow range, the water inlet quantity of each filter in the fixed water quantity group (GF) is controlled to be 0.4×Q / Xm 3 / h;

[0081] When the medium flow rate is reached, the water inflow of each filter in the fixed water inflow group (GF) is controlled at 0.6*Q / X m 3 / h;

[0082] When the high flow rate is reached, the water inflow of each filter in the fixed water inflow group (GF) is controlled at 0.8*Q / X m 3 / h;

[0083] When the full water inflow is reached, the water inflow of each filter in the fixed water inflow group (GF) is controlled at Q / X m 3 / h;

[0084] When the extreme water inflow is reached, the opening of the water inflow regulating valve of each filter in the fixed water inflow group (GF) is kept at 100%.

[0085] Q represents the maximum water inflow of the sewage treatment facility, and X represents the number of biological treatment units of the sewage treatment facility.

[0086] Referring to Figure 1 The biological treatment units are arranged in pairs, so when the division is made, the fixed water inflow group (GF) is composed of a group of biological treatment units, and the water inflow of each biological treatment unit in the group is controlled at a fixed water inflow according to the total water inflow grade, that is, the water inflow is controlled by the flow meter and the regulating valve:

[0087] The free water inflow group (GA) is composed of a group of biological treatment units, and the water inflow (Q a ) of each biological treatment unit in the group is not controlled, that is, the opening of the filter water inflow valve in the group is kept at 100%; wherein X represents the number of biological treatment units of the sewage treatment facility.

[0088] This is based on the results obtained in actual experiments. Such arrangement can better adjust the fixed water inflow group and play a greater role, and the free water inflow group can also ensure a certain basic drainage. In the embodiment, the biological filter process section is composed of 14 groups of biological filter units, so there are 15 filters. When the water inflow of the free water inflow group and the water inflow of the fixed water inflow group reach the preset condition, it is judged that the current total water inflow grade needs to be adjusted, and the current total water inflow grade is adjusted, and then the water inflow of the fixed water inflow group is adjusted. Because there may be sudden extreme weather or sudden need for a large amount of drainage when a small amount of drainage is generated, at this time, the total water inflow grade is adjusted by manual or system according to the judgment, so that the water inflow can be more conveniently and quickly discharged.

[0089] The preset condition includes a first preset condition and a second preset condition,

[0090] The first preset condition is that the maximum water inflow in the free water amount group (GA) is greater than 1.2 times the water amount set value of the fixed water amount group (GF) at the same period, and the duration exceeds the preset time, at which time the total water inflow grade is downgraded;

[0091] The second preset condition is that the maximum water inflow in the free water amount group (GA) is less than 0.8 times the water amount set value of the fixed water amount group (GF) at the same period, and the duration exceeds the preset time, at which time the total water inflow grade is upgraded;

[0092] The above-mentioned preset time is set to 60 seconds in the present application. The adjustment of the total water inflow grade in the present embodiment can also be manually set, or can be automatically judged according to the program to increase or decrease the grade. Therefore, the system can automatically adjust the water amount distribution, and can feedback the total water inflow, but the feedback water inflow cannot be used as the basic data for water amount distribution, because that will cause a cycle error. The upgrade or downgrade here can be set to directly adjust to the corresponding total water inflow grade according to the multiple; or can be set to first perform a one-level upgrade or downgrade, and then judge the upgrade or downgrade, and finally adjust to the appropriate total water inflow grade.

[0093] In actual operation, the operator controls the deviation range of the free water amount group (GA) water inflow by changing the preset condition value for adjusting the water inflow, and the corresponding control range interval is:

[0094]

[0095] Among them, SH represents the preset condition value, and X represents the number of biological treatment units in the sewage treatment facility. For example, the SH parameter executed in the biological filter process section in the background technology is set to 1.2 (0.8), and the corresponding water amount control interval is ±8%. This is an acceptable water amount fluctuation range.

[0096] The biological treatment units are periodically switched between the fixed water amount group (GF) and the free water amount group (GA). The purpose of this is to avoid some filters being in a low load or high load state for a long time, which is not conducive to the overall stable operation of the system. After each standard backwashing is completed, the fixed water amount group (GF) and the free water amount group (GA) are switched with each other, that is, no matter which group the biological treatment unit is in, it is changed to the other group after completing a standard backwashing (or 48 hours). Since the number of the fixed water amount group (GF) and the free water amount group (GA) in the present embodiment is not equal, one group can be set to remain unchanged when switching, and the unchanged group is different each time to ensure that each biological treatment unit can be switched. Or all can be directly switched without reservation to ensure the use of the function.

[0097] In practical application, when a small amount of drainage is carried out, the corresponding gear is determined, the fixed water amount group (GF) carries out corresponding control according to the current state, when a large amount of drainage is suddenly required or a sudden rainstorm weather occurs, etc., the gear can be manually changed by the operator, or the gear can be automatically changed by judging the fixed water amount group (GF) and the free water amount group (GA), after the gear is changed, the fixed water amount group (GF) also carries out corresponding adjustment control. After one standard backwashing is completed, the system controls the fixed water amount group (GF) and the free water amount group (GA) to switch, and then continues to carry out water amount control. Finally, the load balance of each biological treatment unit in operation is ensured.

[0098] The application also provides a device embodiment connected with the above-mentioned embodiment, for realizing the method steps of the above-mentioned embodiment, based on the same name meaning explanation and the same as the above-mentioned embodiment, having the same technical effect as the above-mentioned embodiment, which will not be repeated here.

[0099] As shown in Figure 4 The application provides a control system for open channel water distribution balance, comprising:

[0100] A total water inflow gear setting module sets a total water inflow gear of total water inflow according to the maximum water inflow;

[0101] A filter control module divides all biological treatment units into a fixed water amount group of controlled water inflow and a free water amount group of uncontrolled water inflow;

[0102] A water inflow adjustment module adjusts the current total water inflow gear when the water inflow of the free water amount group and the water inflow of the fixed water amount group reach a preset condition, and then adjusts the water inflow of the fixed water amount group;

[0103] The total water inflow gear controls the water inflow of each biological treatment unit in the fixed water amount group.

[0104] The preset condition includes a first preset condition and a second preset condition,

[0105] The first preset condition is that the maximum water inflow in the free water amount group is greater than 1.2 times of the water amount setting value of the fixed water amount group at the same period, and the duration exceeds 60 seconds, at this time, the total water inflow gear is downgraded;

[0106] The second preset condition is that the maximum water inflow in the free water amount group is less than 0.8 times the water amount set value of the fixed water amount group at the same period, and the duration is more than 60 seconds, at which time the total water inflow range is upgraded. In this embodiment, the adjustment of the total water inflow range can also be manually set, or can be automatically judged according to the program to upgrade or downgrade. Therefore, the system can automatically adjust the water amount distribution, and can feedback the total water inflow, but the feedback water inflow cannot be used as the basic data for water amount distribution, because that will cause a circulation error.

[0107] In actual operation, the operator controls the deviation range of the free water amount group (GA) water inflow by changing the preset condition value for adjusting the water inflow, and the corresponding control range interval is:

[0108]

[0109] Wherein, SH represents the preset condition value, and X represents the number of biological treatment units of the sewage treatment facility. For example, the SH parameter executed in the biological filter process section in the background art is set to 1.2 (0.8), and the corresponding water amount control interval is ±8%. This is an acceptable water amount fluctuation range.

[0110] The total water inflow range includes:

[0111] The low flow range is set to be less than or equal to 40% of the maximum water inflow;

[0112] The medium flow range is set to be greater than 40% of the maximum water inflow, and less than or equal to 60% of the maximum water inflow;

[0113] The high flow range is set to be greater than 60% of the maximum water inflow, and less than or equal to 80% of the maximum water inflow;

[0114] The full water inflow range is set to be greater than 80% of the maximum water inflow, and less than or equal to 100% of the maximum water inflow;

[0115] The extreme water inflow range is set to be greater than 120% of the maximum water inflow.

[0116] Controlling the water inflow of each biological treatment unit in the fixed water amount group according to the total water inflow range includes:

[0117] When the low flow range, the water inflow of each filter in the fixed water amount group is controlled to be 0.4×Q / X m 3 / h;

[0118] When the medium flow range, the water inflow of each filter in the fixed water amount group is controlled to be 0.6×Q / X m 3 / h;

[0119] When the high flow rate is selected, the water inflow rate of each filter tank in the fixed water inflow group is controlled at 0.8×Q / X m 3 / h;

[0120] When the full water inflow rate is selected, the water inflow rate of each filter tank in the fixed water inflow group is controlled at Q / X m 3 / h;

[0121] When the extreme water inflow rate is selected, the water inflow rate of each filter tank in the fixed water inflow group is controlled at 100% of the opening degree of the regulating valve.

[0122] Q represents the maximum water inflow rate of the sewage treatment facility, and X represents the number of biological treatment units of the sewage treatment facility.

[0123] When no total water inflow metering device is arranged in the biological treatment unit of the sewage treatment facility, the control logic can be used to achieve the purpose of balanced water distribution of each biological treatment unit by the open channel water distribution method, and finally ensure the load balance of each biological treatment unit during operation, greatly reducing the possibility of open channel overflow accidents caused by the uncertainty of the total water inflow.

[0124] The above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for controlling the water distribution uniformity in open channels, characterized in that, Includes the following steps: The total inflow rate is preset according to the maximum inflow rate. All biological treatment units are divided into a fixed water volume group with controlled influent flow and a free water volume group with uncontrolled influent flow. When the inflow of the free water volume group and the inflow of the fixed water volume group reach the preset conditions, it is determined that the current total inflow level needs to be adjusted and the current total inflow level is adjusted, and then the inflow of the fixed water volume group is adjusted. The total water inflow rate controls the water inflow of each biological treatment unit within the fixed water inflow group. The preset conditions include a first preset condition and a second preset condition. The first preset condition is: the maximum inflow rate in the free water volume group is greater than 1.2 times the water volume setting value of the fixed water volume group at the same time, and the duration exceeds the preset time. At this time, the total inflow rate is downgraded. The second preset condition is: the maximum inflow rate in the free water volume group is less than 0.8 times the water volume setting value of the fixed water volume group at the same time, and the duration exceeds the preset time. At this time, the total inflow rate is upgraded.

2. The method of claim 1, wherein, The total water inflow range includes: Low flow rate setting: set to less than or equal to 40% of the maximum inflow rate; Medium flow rate setting: greater than 40% of the maximum inflow rate, and less than or equal to 60% of the maximum inflow rate; The high flow rate setting should be set to 60% or less than or equal to the maximum inflow rate. Full water volume setting: set to 80% or less than or equal to 100% of the maximum water inlet volume. The extreme water volume setting is set to 120% greater than the maximum inflow volume.

3. The method according to claim 1, characterized in that, The fixed water amount group consists of consists of biological treatment units, and the free water amount group consists of consists of biological treatment units, wherein X represents the number of biological treatment units in the wastewater treatment plant.

4. The method of claim 2, wherein, The control of the influent volume of each biological treatment unit within the fixed-volume group based on the total influent volume includes: In the low flow range, the water flow rate into each biological treatment unit in the fixed water amount group is controlled to be / h; In the medium flow range, the water inflow of each biological treatment unit in the fixed water amount group is controlled at / h; In the high flow rate range, the water flow rate of each biological treatment unit in the fixed water amount group is controlled to be / h; When the water volume is full, the influent volume of each biological treatment unit within the fixed water volume group is controlled at... / h; During extreme water volume settings, the opening of the inlet flow regulating valve of each biological treatment unit within the fixed water volume group remains at 100%. Q represents the maximum designed influent volume of the wastewater treatment facility, and X represents the number of biological treatment units in the wastewater treatment facility.

5. The method according to claim 1, characterized in that, The deviation range of the free water flow group's inflow is controlled by changing the preset condition values ​​used to adjust the inflow rate. The corresponding control range is as follows: Where SH represents the preset condition value, and X represents the number of biological treatment units in the wastewater treatment facility.

6. The method according to claim 1, characterized in that, After each standard backwash is completed, the fixed water volume group and the free water volume group are switched to each other.

7. A control system for balanced water distribution in an open channel, characterized in that, include: The total water inlet volume setting module allows you to preset the total water inlet volume based on the maximum water inlet volume. The filter control module divides all biological treatment units into a fixed water volume group with controlled influent flow and a free water volume group without controlled influent flow. The water inlet adjustment module determines that the current total water inlet level needs to be adjusted when the water inlet levels of the free water inlet group and the fixed water inlet group reach the preset conditions, and then adjusts the water inlet level of the fixed water inlet group. The total water inflow rate controls the water inflow of each biological treatment unit within the fixed water inflow group. The preset conditions include a first preset condition and a second preset condition. The first preset condition is: the maximum inflow rate in the free water volume group is greater than 1.2 times the water volume setting value of the fixed water volume group at the same time, and the duration exceeds the preset time. At this time, the total inflow rate is downgraded. The second preset condition is: the maximum inflow rate in the free water volume group is less than 0.8 times the water volume setting value of the fixed water volume group at the same time, and the duration exceeds the preset time. At this time, the total inflow rate is upgraded.

8. The system according to claim 7, characterized in that, The total water inflow range includes: Low flow rate setting: set to less than or equal to 40% of the maximum inflow rate; Medium flow rate setting: greater than 40% of the maximum inflow rate, and less than or equal to 60% of the maximum inflow rate; The high flow rate setting should be set to 60% or less than or equal to the maximum inflow rate. Full water volume setting: set to 80% or less than or equal to 100% of the maximum water inlet volume. The extreme water volume setting is set to 120% greater than the maximum inflow volume.

9. The system according to claim 8, characterized in that, The control of the influent volume of each biological treatment unit within the fixed-volume group based on the total influent volume includes: At low flow rates, the influent flow rate of each biological treatment unit within the fixed flow rate group is controlled at 0.4 × Q / X. / h; At medium flow rate, the influent flow rate of each biological treatment unit within the fixed flow rate group is controlled at 0.6 × Q / X. / h; At high flow rates, the influent flow rate of each biological treatment unit within the fixed flow rate group is controlled at 0.8 × Q / X. / h; When the water volume is full, the influent flow rate of each biological treatment unit within the fixed water volume group is controlled at Q / X. / h; During extreme water volume settings, the opening of the inlet flow regulating valve of each biological treatment unit within the fixed water volume group remains at 100%. Q represents the maximum designed influent volume of the wastewater treatment facility, and X represents the number of biological treatment units in the wastewater treatment facility.

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