A method and system for controlling water inlet gate of biological pool in recycled water plant

Abstract

The present invention discloses a method and system for controlling the inlet gate of a biological pond in a reclaimed water plant. The method comprises: obtaining the current sludge concentration of the biological pond; comparing the current sludge concentration with a corresponding sludge concentration threshold range for the biological pond; and determining and executing a control strategy for the biological pond's inlet gate based on the comparison result. The present invention automatically controls the biological pond's inlet gate by adjusting the inlet gate opening based on three parameters: sludge concentration, dissolved oxygen content, and inlet regulating valve opening. This system combines the precise aeration system of the biological pond with the biological pond's inlet gate control system, maximizing microbial activity while reducing dependence on manual labor, ensuring stable effluent quality, improving sewage treatment efficiency, and reducing energy and chemical waste.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and more specifically, relates to a method and system for controlling a water inlet gate of a biological pool in a reclaimed water plant. Background Art

[0002] To ensure the proper operation of reclaimed water plants, they are often designed with multiple biological tanks, or multiple series of tanks operating in parallel. In actual operation, uneven water flow into each tank group is common, requiring operators to adjust the opening of each tank's inlet valve based on experience. This is highly labor-intensive, and untimely water distribution can lead to unstable effluent quality, compromise wastewater treatment efficiency, and waste energy and chemicals.

[0003] Patent document (CN114249415B) discloses a precision aeration device and method, which specifically discloses: a first electric regulating valve is provided at the water inlet end of each biological pool, and the average dissolved oxygen concentration of the aeration pool in each biological pool is obtained. The opening of the first electric regulating valve is adjusted according to the average dissolved oxygen concentration and the set value of the average dissolved oxygen concentration of the aeration pool, thereby adjusting the water distribution of the biological pool. However, it does not take into account the sludge concentration of the biological pool. The size of the sludge concentration is closely related to the water volume of the inlet, which will cause unstable water quality of the effluent.

[0004] Patent document (CN117486430A) discloses a load-balancing water distribution system and method for sewage treatment, which specifically discloses adjusting the water distribution volume of each aeration tank according to the gas-water ratio. However, it does not consider the sludge concentration in the aeration tank, which may cause unstable effluent water quality.

[0005] Patent document (CN117486430A) discloses a load-balancing water distribution system and method for sewage treatment. It specifically discloses adjusting the water distribution volume of each aeration tank according to the sludge concentration. However, it does not take into account the dissolved oxygen concentration in the aeration tank and the opening of the aeration tank air inlet regulating valve, which will cause unstable water quality in the effluent.

[0006] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Summary of the Invention

[0007] The purpose of the present invention is to propose a method and system for controlling the water inlet gate of a biological pool in a reclaimed water plant, so as to realize automatic control of the water inlet gate of the biological pool, and realize joint control of the biological pool precision aeration system and the biological pool water inlet gate control system, so as to maximize the activity of microorganisms while reducing dependence on manual labor, ensuring stable effluent water quality, and improving sewage treatment efficiency.

[0008] To achieve the above-mentioned purpose, the present invention proposes a method and system for controlling the water inlet gate of a biological pool in a reclaimed water plant.

[0009] According to a first aspect of the present invention, a method for controlling a water inlet gate of a biological pool in a reclaimed water plant is proposed, comprising:

[0010] Get the current sludge concentration of the biological pool;

[0011] Comparing the current sludge concentration with a sludge concentration threshold range corresponding to the biological pool;

[0012] Based on the comparison results, a water inlet gate control strategy for the biological pond is determined and executed.

[0013] Optionally, before obtaining the current sludge concentration of the biological pond, the method includes:

[0014] Setting a sludge concentration threshold range corresponding to each of the biological pools;

[0015] Setting a dissolved oxygen content threshold range corresponding to each of the biological ponds;

[0016] Setting the opening threshold range of the air intake regulating valve corresponding to each of the biological pools;

[0017] Set the opening range of the water inlet gate corresponding to each biological pool.

[0018] Set the biological pool inlet gate control period.

[0019] Optionally, if the current sludge concentration is within the sludge concentration threshold range corresponding to the biological pool, obtaining the current dissolved oxygen content and the current opening of the air intake regulating valve of the biological pool;

[0020] Comparing the current dissolved oxygen content with the dissolved oxygen content threshold range corresponding to the biological pool, and comparing the current air intake regulating valve opening with the air intake regulating valve opening threshold range corresponding to the biological pool;

[0021] Based on the comparison results, a water inlet gate control strategy for the biological pond is determined and executed.

[0022] Optionally, if the current dissolved oxygen content is less than the minimum value of the dissolved oxygen content threshold range corresponding to the biological pool, and the current air intake regulating valve opening is greater than the maximum value of the air intake regulating valve opening threshold range corresponding to the biological pool, the water intake gate opening corresponding to the biological pool is reduced based on the set first water intake gate opening value.

[0023] Optionally, if the current dissolved oxygen content is greater than the maximum value of the dissolved oxygen content threshold range corresponding to the biological pool, and the current air intake regulating valve opening is less than the minimum value of the air intake regulating valve opening threshold range corresponding to the biological pool, the water intake gate opening corresponding to the biological pool is increased based on the set second water intake gate opening value.

[0024] Optionally, except for the above two comparison results, the opening of the water inlet gate corresponding to the biological pool is not adjusted.

[0025] Optionally, if the current sludge concentration is greater than the maximum value of the sludge concentration threshold range corresponding to the biological pool, the opening of the water inlet gate corresponding to the biological pool is increased based on the set third water inlet gate opening value.

[0026] Optionally, if the current sludge concentration is less than the minimum value of the sludge concentration threshold range corresponding to the biological pool, the opening of the water inlet gate corresponding to the biological pool is reduced based on the set fourth water inlet gate opening value.

[0027] Optionally, during the execution of the water inlet gate control strategy of the biological pond, the opening of the water inlet gate of the biological pond satisfies the water inlet gate opening range corresponding to the biological pond.

[0028] According to a second aspect of the present invention, a water inlet gate control system for a biological pool in a reclaimed water plant is provided, comprising:

[0029] An acquisition module is used to obtain the current sludge concentration of the biological pool;

[0030] A comparison module, configured to compare the current sludge concentration with a sludge concentration threshold range corresponding to the biological pool;

[0031] The determination and execution module is used to determine and execute the water inlet gate control strategy of the biological pond based on the comparison result.

[0032] The beneficial effects of the present invention are as follows: the present invention compares the current sludge concentration of the biological pool with the sludge concentration threshold range corresponding to the biological pool, determines and executes the water inlet gate control strategy of the biological pool based on the comparison result, realizes automatic control of the water inlet gate of the biological pool, realizes the joint control of the biological pool precision aeration system and the biological pool water inlet gate control system, maximizes the activity of microorganisms, reduces dependence on manual labor, ensures stable effluent water quality, and improves sewage treatment efficiency.

[0033] The system of the present invention has other features and advantages that will be apparent from or will be described in detail in the accompanying drawings and subsequent detailed description incorporated herein, which together serve to explain the specific principles of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings, in which like reference numerals generally represent like components.

[0035] Figure 1 A flow chart showing the steps of a method for controlling a water inlet gate of a biological pool in a reclaimed water plant according to the present invention is shown.

[0036] Figure 2 A flowchart showing the steps of a method for controlling a water inlet gate of a biological pond in a reclaimed water plant according to embodiment 1 of the present invention is shown.

[0037] Figure 3 A schematic diagram of a biological pond equipped with a precise aeration system according to Example 2 of the present invention is shown.

[0038] Figure 4 A schematic diagram of a water inlet gate control system for a biological pond in a reclaimed water plant according to embodiment 3 of the present invention is shown. DETAILED DESCRIPTION

[0039] The present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention may be implemented in various forms and is not limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0040] like Figure 1 As shown, a method for controlling a water inlet gate of a biological pool in a reclaimed water plant according to the present invention includes:

[0041] Get the current sludge concentration of the biological pool;

[0042] Compare the current sludge concentration with the sludge concentration threshold range corresponding to the biological pool;

[0043] Based on the comparison results, the water inlet gate control strategy of the biological pond is determined and implemented.

[0044] Specifically, first, the sludge concentration threshold range, dissolved oxygen content threshold range, air intake regulating valve opening threshold range, water inlet gate opening range and water inlet gate control cycle corresponding to each biological pool are set; every time a control cycle, the current sludge concentration of the biological pool is obtained, and the current sludge concentration is compared with the sludge concentration threshold range corresponding to the biological pool, and the water inlet gate control strategy of the biological pool is determined and executed based on the comparison result; when the comparison result shows that the current sludge concentration is greater than the maximum value of the sludge concentration threshold range corresponding to the biological pool, the biological pool is increased based on the set third water inlet gate opening value. The corresponding water inlet gate opening; when the comparison result is that the current sludge concentration is less than the minimum value of the sludge concentration threshold range corresponding to the biological pool, the water inlet gate opening corresponding to the biological pool is reduced based on the set fourth water inlet gate opening value; when the comparison result is that the current sludge concentration is within the sludge concentration threshold range corresponding to the biological pool, the current dissolved oxygen content and the current air inlet regulating valve opening of the biological pool are obtained, and the current dissolved oxygen content is compared with the dissolved oxygen content threshold range corresponding to the biological pool, and the current air inlet regulating valve opening is compared with the air inlet regulating valve opening threshold range corresponding to the biological pool. The comparison result determines the control strategy of the water inlet gate of the biological pool and executes it. When the comparison result is that the current dissolved oxygen content is less than the minimum value of the dissolved oxygen content threshold range corresponding to the biological pool, and the current air inlet regulating valve opening is greater than the maximum value of the air inlet regulating valve opening threshold range corresponding to the biological pool, then the opening of the water inlet gate corresponding to the biological pool is reduced based on the set first water inlet gate opening value. When the comparison result is that the current dissolved oxygen content is greater than the maximum value of the dissolved oxygen content threshold range corresponding to the biological pool, and the current air inlet regulating valve opening is less than the minimum value of the air inlet regulating valve opening threshold range corresponding to the biological pool, then based on the set The second water inlet gate opening value is set to increase the water inlet gate opening corresponding to the biological pool. Except for the above two comparison results, the water inlet gate opening corresponding to the biological pool is not adjusted. The present invention adjusts the water inlet gate opening based on three parameters: sludge concentration, dissolved oxygen content and air inlet regulating valve opening, thereby realizing automatic control of the water inlet gate of the biological pool, and realizing joint control of the biological pool precision aeration system and the biological pool water inlet gate control system, maximizing the activity of microorganisms while reducing dependence on manual labor, ensuring stable effluent water quality, improving sewage treatment efficiency, and reducing waste of energy and chemicals.

[0045] In one example, before obtaining the current sludge concentration of the biological pond, the following steps are included:

[0046] Set the sludge concentration threshold range corresponding to each biological pool;

[0047] Set the dissolved oxygen content threshold range corresponding to each biological pool;

[0048] Set the opening threshold range of the air inlet regulating valve corresponding to each biological pool;

[0049] Set the opening range of the water inlet gate corresponding to each biological pool.

[0050] Set the biological pool inlet gate control period.

[0051] In one example, if the current sludge concentration is within the sludge concentration threshold range corresponding to the biological pool, the current dissolved oxygen content and the current opening of the air inlet regulating valve of the biological pool are obtained;

[0052] Compare the current dissolved oxygen content with the dissolved oxygen content threshold range corresponding to the biological pool, and compare the current air intake regulating valve opening with the air intake regulating valve opening threshold range corresponding to the biological pool;

[0053] Based on the comparison results, the water inlet gate control strategy of the biological pond is determined and implemented.

[0054] In one example, if the current dissolved oxygen content is less than the minimum value of the dissolved oxygen content threshold range corresponding to the biological pool, and the current air intake regulating valve opening is greater than the maximum value of the air intake regulating valve opening threshold range corresponding to the biological pool, the water intake gate opening corresponding to the biological pool is reduced based on the set first water intake gate opening value.

[0055] In one example, if the current dissolved oxygen content is greater than the maximum value of the dissolved oxygen content threshold range corresponding to the biological pool, and the current air intake regulating valve opening is less than the minimum value of the air intake regulating valve opening threshold range corresponding to the biological pool, the water intake gate opening corresponding to the biological pool is increased based on the set second water intake gate opening value.

[0056] In one example, in addition to the two comparison results mentioned above, the opening of the water inlet gate corresponding to the biological pool is not adjusted.

[0057] In one example, if the current sludge concentration is greater than the maximum value of the sludge concentration threshold range corresponding to the biological pool, the opening of the water inlet gate corresponding to the biological pool is increased based on the set third water inlet gate opening value.

[0058] In one example, if the current sludge concentration is less than the minimum value of the sludge concentration threshold range corresponding to the biological pool, the opening of the water inlet gate corresponding to the biological pool is reduced based on the set fourth water inlet gate opening value.

[0059] In one example, during the execution of the biological pool water inlet gate control strategy, the biological pool water inlet gate opening degree satisfies the biological pool corresponding water inlet gate opening degree range.

[0060] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present invention may be combined with each other.

[0061] Example 1

[0062] like Figure 2 As shown, this embodiment provides a method for controlling a water inlet gate of a biological pool in a reclaimed water plant, comprising:

[0063] 1. A precise aeration system is installed in each biological pool of the reclaimed water plant. The equipment mainly includes an online DO meter and a gas electric control valve, etc., to achieve real-time data transmission. An adjustable electric inlet gate is installed at the water inlet of each biological pool of the reclaimed water plant, and the opening of the gate can be remotely controlled within a range of 0-100%. An online sludge concentration meter is installed in the middle of the aeration tank of each biological pool to achieve real-time data transmission.

[0064] 2. Set the time interval for the water inlet gate to operate, that is, the control cycle is N hours, and the gate operates once every N hours. Set the maximum value E and minimum value F of the water inlet gate opening; set the low value A1 and high value A2 of the online DO value of each group of biological pools, set the low value D1 and high value D2 of the online sludge concentration value, set the low value B1 and high value B2 of the gas electric regulating valve opening. All set values ​​are external and can be set manually.

[0065] 3. Every N hours, obtain the online DO value A, the gas electric regulating valve opening value B, the water inlet gate opening value C and the online sludge concentration value D of each group of biological pools;

[0066] 4. When the online sludge concentration value D of the biological pool is between D1 and D2, the following judgment is made:

[0067] When the online DO value A of the corresponding biological pool is lower than A1, and the corresponding biological pool valve opening value B is greater than B2, the water inlet gate is reduced to C1 on the original basis;

[0068] When the online DO value A of the corresponding biological pool is higher than A2, and the valve opening value B of the corresponding biological pool is less than B1, the water inlet gate will increase its opening by C2 on the original basis;

[0069] Except for the above two cases, the opening of the water inlet gate will not be adjusted;

[0070] 5. When the online sludge concentration value D of the biological pool is greater than D2, the corresponding biological pool inlet gate will be increased by C3 on the original basis;

[0071] 6. When the online sludge concentration value D of the biological pool is less than D1, the corresponding biological pool inlet gate is reduced by C4 on the original basis;

[0072] When the above judgment shows that the biological pool water inlet gate setting opening is greater than the E value, the biological pool water inlet gate setting value remains at the E value; when the biological pool water inlet gate setting opening is less than the F value, the biological pool water inlet gate setting value remains at the F value.

[0073] Example 2

[0074] This embodiment provides a method for controlling a water inlet gate of a biological pool in a reclaimed water plant, comprising:

[0075] 1. If Figure 3 As shown, a precise aeration system is configured in two biological pools of the reclaimed water plant, including an inlet pipe 1, an inlet channel 2, and an air inlet pipe 7. The equipment mainly includes an online sludge concentration meter 4, an online DO meter 5, and a gas electric regulating valve 6 to achieve real-time data transmission; an adjustable electric inlet gate 3 is configured at the water inlet end of the two biological pools of the reclaimed water plant, and the opening of the gate can be remotely controlled, with an opening range of 0-100%; an online sludge concentration meter 4 is installed in the middle section of the aeration tank of the two biological pools to achieve real-time data transmission;

[0076] 2. Set the action time interval of the adjustable electric water inlet gate 3, that is, the control cycle is 2 hours, and the gate is actuated once every 2 hours. Set the maximum opening of the water inlet gate to 95% and the minimum opening to 20%. Set the low value of the online DO value of the two groups of biological pools to 1 mg / L and the high value of the online DO to 3 mg / L. Set the low value of the online sludge concentration to 3000 mg / L and the high value to 6000 mg / L. Set the low value of the opening of the gas electric regulating valve to 30% and the high value to 95%.

[0077] 3. Every 2 hours, obtain two sets of biological pool online DO values ​​A, gas electric regulating valve opening value B, water inlet gate opening value C and online sludge concentration value D;

[0078] 4. When the online sludge concentration value of the biological pool is between 3000mg / L and 6000mg / L, the following judgment is made:

[0079] When the online DO value A of the corresponding biological pool is lower than 1 mg / L, and the opening value B of the corresponding biological pool gas electric regulating valve is greater than 95%, the adjustable electric water inlet gate 3 is reduced by 5% on the original basis;

[0080] When the online DO value A of the corresponding biological pool is higher than 3 mg / L, and the opening value B of the corresponding biological pool gas electric regulating valve is less than 30%, the adjustable electric water inlet gate 3 increases its opening by 10% on the original basis;

[0081] 5. When the online sludge concentration value D of the biological pool is greater than 6000 mg / L, the adjustable electric water inlet gate 3 of the corresponding biological pool will be increased by 15% on the original basis;

[0082] 6. When the online sludge concentration value D of the biological pool is less than 3000 mg / L, the adjustable electric water inlet gate 3 of the corresponding biological pool is reduced by 20% on the original basis;

[0083] When the above judgment shows that the biological pool water inlet gate is set to open more than 95%, the biological pool water inlet gate setting value remains at 95%; when the biological pool water inlet gate is set to open less than 20%, the biological pool water inlet gate setting value remains at 20%.

[0084] Example 3

[0085] like Figure 4 As shown, this embodiment provides a water inlet gate control system for a biological pool in a reclaimed water plant, comprising:

[0086] An acquisition module is used to obtain the current sludge concentration of the biological pool;

[0087] A comparison module is used to compare the current sludge concentration with the sludge concentration threshold range corresponding to the biological pool;

[0088] The determination and execution module is used to determine and execute the water inlet gate control strategy of the biological pool based on the comparison results.

[0089] While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not 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 the water inlet gate of a biological pool in a reclaimed water plant, characterized in that: include: Get the current sludge concentration of the biological pool; Comparing the current sludge concentration with a sludge concentration threshold range corresponding to the biological pool; Determine and execute a water inlet gate control strategy for the biological pond based on the comparison results; If the current sludge concentration is within the sludge concentration threshold range corresponding to the biological pool, obtaining the current dissolved oxygen content and the current opening of the air intake regulating valve of the biological pool; Comparing the current dissolved oxygen content with the dissolved oxygen content threshold range corresponding to the biological pool, and comparing the current air intake regulating valve opening with the air intake regulating valve opening threshold range corresponding to the biological pool; Based on the comparison results, a water inlet gate control strategy for the biological pond is determined and executed.

2. The method for controlling the water inlet gate of the biological pool of a reclaimed water plant according to claim 1, characterized in that: Before obtaining the current sludge concentration of the biological pond, the method includes: Setting a sludge concentration threshold range corresponding to each of the biological pools; Setting a dissolved oxygen content threshold range corresponding to each of the biological ponds; Setting the opening threshold range of the air intake regulating valve corresponding to each of the biological pools; Setting the opening range of the water inlet gate corresponding to each biological pool; Set the biological pool inlet gate control period.

3. The method for controlling the water inlet gate of the biological pool of a reclaimed water plant according to claim 1, characterized in that: If the current dissolved oxygen content is less than the minimum value of the dissolved oxygen content threshold range corresponding to the biological pool, and the current air intake regulating valve opening is greater than the maximum value of the air intake regulating valve opening threshold range corresponding to the biological pool, the water intake gate opening corresponding to the biological pool is reduced based on the set first water intake gate opening value.

4. The method for controlling the water inlet gate of the biological pool of a reclaimed water plant according to claim 3, characterized in that: If the current dissolved oxygen content is greater than the maximum value of the dissolved oxygen content threshold range corresponding to the biological pool, and the current air intake regulating valve opening is less than the minimum value of the air intake regulating valve opening threshold range corresponding to the biological pool, the water intake gate opening corresponding to the biological pool is increased based on the set second water intake gate opening value.

5. The method for controlling the water inlet gate of the biological pool of a reclaimed water plant according to claim 4, characterized in that: Except for the above two comparison results, the opening of the water inlet gate corresponding to the biological pool is not adjusted.

6. The method for controlling the water inlet gate of the biological pool of a reclaimed water plant according to claim 1, characterized in that: If the current sludge concentration is greater than the maximum value of the sludge concentration threshold range corresponding to the biological pool, the opening of the water inlet gate corresponding to the biological pool is increased based on the set third water inlet gate opening value.

7. The method for controlling the water inlet gate of a biological pool in a reclaimed water plant according to claim 1, characterized in that: If the current sludge concentration is less than the minimum value of the sludge concentration threshold range corresponding to the biological pool, the opening of the water inlet gate corresponding to the biological pool is reduced based on the set fourth water inlet gate opening value.

8. The method for controlling the water inlet gate of a biological pool in a reclaimed water plant according to claim 1, characterized in that: During the execution of the water inlet gate control strategy of the biological pool, the opening of the water inlet gate of the biological pool satisfies the water inlet gate opening range corresponding to the biological pool.

9. A water inlet gate control system for a biological pool in a reclaimed water plant, characterized in that: include: An acquisition module is used to obtain the current sludge concentration of the biological pool; A comparison module, configured to compare the current sludge concentration with a sludge concentration threshold range corresponding to the biological pool; A determination and execution module, configured to determine and execute a water inlet gate control strategy for the biological pond based on the comparison result; If the current sludge concentration is within the sludge concentration threshold range corresponding to the biological pool, obtaining the current dissolved oxygen content and the current opening of the air intake regulating valve of the biological pool; Comparing the current dissolved oxygen content with the dissolved oxygen content threshold range corresponding to the biological pool, and comparing the current air intake regulating valve opening with the air intake regulating valve opening threshold range corresponding to the biological pool; Based on the comparison results, a water inlet gate control strategy for the biological pond is determined and executed.

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