Method and system for determining circulating water flow of denitrification target in shallow water area

Abstract

The invention provides a method and a system for determining circulating water flow of a denitrification target in a shallow water area, and relates to the technical field of environmental protection. The technical problems of nitrogen pollution and eutrophication in shallow water areas in the prior art are solved. The method comprises the following steps: acquiring hydrological characteristic data of a target shallow water area, inlet and outlet water quality characteristic data of hydrodynamic circulation equipment and equipment characteristic data; based on the hydrological characteristic data and the inlet and outlet water quality characteristic data of the hydrodynamic circulation equipment, the initial nitrogen removal amount of the hydrodynamic circulation equipment is determined, and the nitrogen retention time under the initial circulation flow of the hydrodynamic circulation equipment is determined; based on the nitrogen retention time, the equipment characteristic data and the hydrological characteristic data under the initial circulation flow, determining the denitrification reaction characteristic length of the target shallow water area; and based on the denitrification reaction characteristic length and the target nitrogen removal amount of the target shallow water region, determining the target circulation flow of the hydrodynamic circulation equipment, thereby reducing nitrogen pollution and improving the ecological health level of the water body in the shallow water region.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection technology, and in particular to a method and system for determining a circulating water flow rate for a denitrification target in a shallow water area. Background Art

[0003] The current mainstream eutrophication prevention and control technology system mainly includes physical method, chemical method, biological method and hydraulic control. The physical method directly removes pollutants through mechanical algae removal, sediment dredging and other methods, but its engineering cost is high and the treatment efficiency is limited by the scale of equipment; the chemical method mainly uses algaecides (such as copper sulfate, hydrogen peroxide, etc.) for emergency treatment. Although it can quickly inhibit the proliferation of algae, long-term use is prone to accumulation of chemical residues and there is a significant risk of ecotoxicity; biological methods represented by fish control and microbial restoration are environmentally friendly, but there is a risk of biological invasion, and when the algae biomass exceeds 10 7 Hydraulic regulation dilutes the nutrient concentration by introducing clean water, but it consumes a lot of water resources (the replacement water volume usually needs to reach more than 30% of the water volume), and frequent hydraulic disturbances may destroy the balance of the original water ecosystem.

[0004] At present, existing prevention and control technologies generally have limitations in time and space applicability: physical methods are only applicable to small-scale closed water bodies (<1km 2 ), chemical methods are mostly used for emergency treatment (duration < 72h), biological methods require the construction of a stable ecosystem in advance (construction period > 3 years), and hydraulic regulation is limited by regional water resource allocation conditions. Therefore, how to develop an efficient, low-cost, and sustainable eutrophication prevention and control technology system is still a difficult problem that needs to be solved in the current field of water environment engineering. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a method and system for determining the circulating water flow rate for denitrification targets in shallow water areas, thereby reducing nitrogen pollution and improving the ecological health level of water bodies in shallow water areas.

[0006] In a first aspect, the present invention provides a method for determining a circulating water flow rate for a denitrification target in a shallow water area, comprising:

[0007] Obtain hydrological characteristic data of the target shallow water area, inlet and outlet water quality characteristic data of the hydrodynamic circulation equipment, and equipment characteristic data;

[0008] Based on the hydrological characteristic data and the inlet and outlet water quality characteristic data of the hydrodynamic circulation equipment, determine the initial nitrogen removal amount of the hydrodynamic circulation equipment, and determine the nitrogen residence time under the initial circulation flow of the hydrodynamic circulation equipment;

[0009] Determine the denitrification reaction characteristic length of the target shallow water area based on the nitrogen residence time at the initial circulation flow rate, equipment characteristic data, and hydrological characteristic data;

[0010] Determine the target circulation flow rate of the hydrodynamic circulation equipment based on the denitrification reaction characteristic length of the target shallow water area and the target nitrogen removal amount.

[0011] Optionally, the hydrological characteristic data includes the area and water depth of the target shallow water area; the water quality characteristics include water temperature, suspended solid concentration, total nitrogen, and biochemical oxygen demand; the equipment characteristic data includes the pipeline length and the initial circulation flow rate of the circulation pump.

[0012] Optionally, obtain the inlet and outlet water quality characteristic data of the hydrodynamic circulation equipment, including:

[0013] Obtain the water temperature, suspended solid concentration, total nitrogen, and biochemical oxygen demand collected by sensors at the sampling positions set in the shallow water area as the inlet and outlet water quality characteristic data; among them, the sampling positions include the inlet and outlet of the hydrodynamic circulation equipment.

[0014] Optionally, based on the hydrological characteristic data and the inlet and outlet water quality characteristic data of the hydrodynamic circulation equipment, determine the initial nitrogen removal amount of the hydrodynamic circulation equipment and the nitrogen residence time at the initial circulation flow rate of the hydrodynamic circulation equipment, including:

[0015] Determine the nitrogen residence time at the initial circulation flow rate of the target shallow water area through the following formula:

[0016]

[0017] In the formula, t is the nitrogen residence time at the initial circulation flow rate, with the unit of d; V n is the volume of the denitrification reactor, with the unit of m 3 ; Q 初 is the initial circulation flow rate of the circulation pump, with the unit of m 3 / d; L1 is the denitrification reaction characteristic length of the shallow water area, with the unit of m; V is the circulation water flow velocity, m / s; N k is the total nitrogen concentration at the inlet of the hydrodynamic equipment, with the unit of mg / L, N te is the total nitrogen concentration at the outlet of the hydrodynamic circulation equipment, with the unit of mg / L; y is the proportion of the mass of mixed liquor suspended solids in the total mass of mixed liquor suspended solids, g / g; Y t is the sludge yield coefficient, kg / kg; S o is the biochemical oxygen demand at the inlet of the hydrodynamic circulation equipment, mg / L; S e is the biochemical oxygen demand at the outlet of the hydrodynamic circulation equipment, mg / L; K de(T) is the microbial denitrification rate at temperature t, kg / (kg·d); X is the suspended solid concentration, g / L.

[0018] Optionally, based on the nitrogen residence time, equipment characteristic data, and hydrological characteristic data under the initial circulation flow rate, determine the denitrification reaction characteristic length of the target shallow water area, including:

[0019] Determine the denitrification reaction characteristic length of the target shallow water area through the following formula:

[0020]

[0021] In the formula, L1 is the denitrification reaction characteristic length of the shallow water area, with the unit of m; L is the total length of the cross-section at the pipeline burial location in the shallow water area, with the unit of m; t is the nitrogen residence time under the initial circulation flow rate of the circulation pump in the target shallow water area, with the unit of d; Q 初 is the initial circulation flow rate of the circulation pump, with the unit of m 3 / d; S is the water surface area of the shallow water area, with the unit of m 2 ; H is the effective water depth of the shallow water area, with the unit of m.

[0022] Optionally, based on the denitrification reaction characteristic length of the target shallow water area and the target nitrogen removal amount, determine the target circulation flow rate of the hydrodynamic circulation equipment, including:

[0023] Determine the target circulation flow rate of the hydrodynamic circulation equipment through the following formula:

[0024]

[0025] In the formula, Q is the optimal circulation flow rate, with the unit of m 3 / d; K de(T) is the microbial denitrification rate at temperature t; X is the suspended solid concentration, with the unit of g / L; N k is the total nitrogen concentration of the influent of the hydrodynamic equipment, with the unit of mg / L; N te is the total nitrogen concentration of the effluent of the hydrodynamic circulation equipment, with the unit of mg / L; y is the proportion of the mass of the mixed liquor suspended solids in the total mass of the mixed liquor suspended solids, with the unit of g / g; Y t is the sludge yield coefficient, with the unit of kg / kg; S o is the biochemical oxygen demand of the influent of the hydrodynamic circulation equipment, with the unit of mg / L; S e is the biochemical oxygen demand of the effluent of the hydrodynamic circulation equipment, with the unit of mg / L.

[0026] Optionally, based on the denitrification reaction characteristic length of the target shallow water area and the desired nitrogen removal amount, determine the target circulation flow rate of the hydrodynamic circulation equipment, including:

[0027] Based on the denitrification reaction characteristic length of the target shallow water area and the desired nitrogen removal amount, obtain the current circulation flow rate of the hydrodynamic circulation equipment;

[0028] Based on a preset time and the current circulation flow rate, determine the current water quality of the target shallow water area. When the current water quality of the target shallow water area reaches the target water quality, the current circulation flow rate of the hydrodynamic circulation device is the target circulation flow rate.

[0029] Optionally, determining the current water quality of the target shallow water area based on a preset time and the current circulation flow rate further includes:

[0030] If the current water quality of the target shallow water area does not reach the target water quality, update the pipeline length and / or the number of circulation pumps until the current water quality of the target shallow water area reaches the target water quality.

[0031] In a second aspect, the present invention provides a system for determining the circulation water flow rate for denitrification targets in a shallow water area, including: a hydrodynamic circulation device and an electronic device; the hydrodynamic circulation device is connected to the electronic device;

[0032] The electronic device is configured to: obtain the hydrological characteristic data of the target shallow water area, the inlet and outlet water quality characteristic data of the hydrodynamic circulation device, and the device characteristic data; determine the initial nitrogen removal amount of the hydrodynamic circulation device based on the hydrological characteristic data and the inlet and outlet water quality characteristic data of the hydrodynamic circulation device, and determine the nitrogen residence time at the initial circulation flow rate of the hydrodynamic circulation device; determine the denitrification reaction characteristic length of the target shallow water area based on the nitrogen residence time at the initial circulation flow rate, the device characteristic data, and the hydrological characteristic data; determine the target circulation flow rate of the hydrodynamic circulation device based on the denitrification reaction characteristic length of the target shallow water area and the target nitrogen removal amount.

[0033] Optionally, the hydrodynamic circulation device includes a plurality of circulation pumps, and the plurality of circulation pumps are connected at equal intervals through pipelines.

[0034] A method and a system for determining the circulation water flow rate for denitrification targets in a shallow water area provided by an embodiment of the present invention, by obtaining the hydrological characteristic data of the target shallow water area, the inlet and outlet water quality characteristic data of the hydrodynamic circulation device, and the device characteristic data; determining the initial nitrogen removal amount of the hydrodynamic circulation device based on the hydrological characteristic data and the inlet and outlet water quality characteristic data of the hydrodynamic circulation device, and determining the nitrogen residence time at the initial circulation flow rate of the hydrodynamic circulation device; determining the denitrification reaction characteristic length of the target shallow water area based on the nitrogen residence time at the initial circulation flow rate, the device characteristic data, and the hydrological characteristic data; determining the target circulation flow rate of the hydrodynamic circulation device based on the denitrification reaction characteristic length of the target shallow water area and the target nitrogen removal amount, to maximize the nitrogen removal efficiency, thereby reducing nitrogen pollution and improving the ecological health level of the water body in the shallow water area.

[0035] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes the following detailed description. Brief Description of the Drawings

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and 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.

[0037] Figure 1 Shows a flowchart of a method for determining the circulating water flow rate for denitrification targets in a shallow water area provided by an embodiment of the present invention;

[0038] Figure 2 Shows a schematic structural diagram of a denitrification reactor in which a shallow water area is generalized provided by an embodiment of the present invention;

[0039] Figure 3 Shows a schematic structural diagram of a hydrodynamic circulation device located in a shallow water area provided by an embodiment of the present invention;

[0040] Figure 4 Shows a schematic structural diagram of an electronic device provided by an embodiment of the present invention. Detailed Embodiments

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention to be protected, but only represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0042] To facilitate better understanding of the present application by those of ordinary skill in the art, the technical terms involved in the present application will be briefly introduced below.

[0043] A shallow water area is a water source with no flow or extremely low fluidity. In the present application, the shallow water area can be a shallow pond or a shallow lake.

[0044] Hydrological characteristic data are data used to reflect the hydrological characteristics of a shallow water area. In the present application, the hydrological characteristic data include various physical parameters such as the area and effective water depth of the shallow water area. This physical parameter can provide basic data support for the design and installation of subsequent hydrodynamic circulation devices.

[0045] The inlet and outlet water quality characteristic data are data used to reflect the water quality characteristics of the hydrodynamic circulation equipment. In this application, the inlet and outlet water quality characteristic data include the water temperature, suspended solid concentration, total nitrogen (TN), biochemical oxygen demand (BOD), etc. at the inlet and outlet.

[0046] The equipment characteristic data are data used to reflect the equipment characteristics of the hydrodynamic circulation equipment. In this application, the equipment characteristic data include the pipeline length, initial circulation flow rate of the circulation pump, etc.

[0047] After introducing the technical terms involved in this application, next, the technical solutions provided by this application will be described in detail.

[0048] An embodiment of this application provides a method for determining the circulation water flow rate for the denitrification target in the shallow water area. Refer to Figure 1 As shown, the general process of the method for determining the circulation water flow rate for the denitrification target in the shallow water area provided by the embodiment of this application is as follows:

[0049] Step S110: Obtain the hydrological characteristic data of the target shallow water area, the inlet and outlet water quality characteristic data, and the equipment characteristic data of the hydrodynamic circulation equipment.

[0050] Among them, on-site measurement or remote sensing technology can be used for on-site measurement to obtain the area and effective water depth of the target shallow water area.

[0051] Furthermore, the effective water depth can be taken as 1 / 2 of the average water depth, that is, measure the water depth at multiple points and take the average value to ensure that the entire pond area is covered.

[0052] In order to ensure that the water quality in the shallow water area is optimal, a hydrodynamic circulation equipment is set in the shallow water area, which can transport the surface water in the shallow water area to the bottom through the drainage pipeline to increase the vertical mixing effect of the water body in the shallow water area. By adjusting the circulation water flow rate using the hydrodynamic circulation equipment, the water body mixing is strengthened, making it easier for dissolved oxygen to enter the water body, reducing sludge deposition; and dispersing pollutants to a wider area, reducing the impact on specific areas and promoting the natural purification of the water body, maintaining a good ecological environment.

[0053] In an alternative embodiment, obtain the water temperature, suspended solid concentration, total nitrogen, and biochemical oxygen demand collected by sensors at the sampling positions set in the shallow water area as the inlet and outlet water quality characteristic data; among them, the sampling positions include the inlet and outlet of the hydrodynamic circulation equipment.

[0054] Among them, multiple stratified sampling points are set in the shallow water area to ensure that sampling and monitoring can be carried out at the inlet and outlet of the hydrodynamic circulation equipment to monitor the internal flow situation and nitrogen distribution of the water body in the shallow water area in real time.

[0055] Furthermore, key water quality indicators such as the water temperature, suspended solid concentration, total nitrogen (TN), and biochemical oxygen demand (BOD5) at the inlet and outlet of the hydrodynamic circulation equipment are regularly obtained.

[0056] Step S120: Based on the hydrological characteristic data and the water quality characteristic data at the inlet and outlet of the hydrodynamic circulation equipment, determine the initial nitrogen removal amount of the hydrodynamic circulation equipment, and determine the nitrogen residence time at the initial circulation flow rate of the hydrodynamic circulation equipment.

[0057] Among them, in this application, with nitrogen removal as the goal, as Figure 2 shown, the shallow water area is generalized as a denitrification reactor, and the volume of the denitrification reactor can be calculated according to the following formula:

[0058]

[0059] K de(T) = K de(20) 1.08 (T-20)

[0060]

[0061] V n = AL1

[0062] Q 初 = AV

[0063] In the formula, V n is the volume of the denitrification reactor, with the unit of m 3 ; Q 初 is the initial circulation flow rate of the circulation pump, with the unit of m 3 / d; N k is the total nitrogen concentration of the influent of the hydrodynamic equipment, with the unit of mg / L; N te is the total nitrogen concentration of the effluent of the hydrodynamic circulation equipment, with the unit of mg / L; ΔX v is the reduced biomass, with the unit of kg / d; K de(T) is the microbial denitrification rate at temperature T; X is the suspended solid concentration, with the unit of g / L; T is the ambient temperature, in °C; y is the proportion of the mass of the mixed liquor suspended solids to the total mass of the mixed liquor suspended solids, with the unit of g / g; Y t is the sludge yield coefficient, with the unit of kg / kg; S o is the biochemical oxygen demand of the influent of the hydrodynamic circulation equipment, with the unit of mg / L; S e is the biochemical oxygen demand of the effluent of the hydrodynamic circulation equipment, with the unit of mg / L; A is the cross-sectional area of the denitrification reactor, with the unit of m 2 ; L1 is the characteristic length of the denitrification reaction in the shallow water area, with the unit of m.

[0064] According to the above formula, it can be seen that Among them, since the length L1 of the target reactor is less than L, which is the pipeline length, there exists a critical flow velocity t1 is the time for water flow to pass through the denitrification reactor with length L1, and the unit is s. When the water flow velocity is greater than the critical flow velocity, the length of the denitrification reactor is compressed and the denitrification efficiency decreases; when the water flow velocity is less than the critical flow velocity, the residence time is too long and the denitrification efficiency increases.

[0065] Among them, during the biochemical reaction of nitrogen balance and microbial denitrification, the total nitrogen removal amount N of the water can be obtained according to the total inlet nitrogen N k and the total outlet nitrogen N te of the hydrodynamic circulation equipment. The difference between them is the nitrogen removal amount N e . The calculation of the nitrogen residence time t is based on the nitrogen balance and the biochemical reaction of microbial denitrification, and it is a functional relationship of the nitrogen removal amount N e (the difference between the total inlet nitrogen N k and the total outlet nitrogen N te ).

[0066] Furthermore, the nitrogen residence time under the initial circulation flow rate can be determined by the following formula:

[0067]

[0068] In the formula, t is the nitrogen residence time under the initial circulation flow rate, and the unit is d; V n is the volume of the denitrification reactor, and the unit is m 3 ; Q 初 is the initial circulation flow rate of the circulation pump, and the unit is m 3 / d; L1 is the characteristic length of the denitrification reaction in the shallow water area, and the unit is m; V is the circulation water flow velocity, m / s; N k is the total inlet nitrogen concentration of the hydrodynamic equipment, and the unit is mg / L, N te is the total outlet nitrogen concentration of the hydrodynamic circulation equipment, and the unit is mg / L; y is the proportion of the mass of mixed liquid suspended solids in the total mass of mixed liquid total suspended solids, g / g; Y t is the sludge yield coefficient, kg / kg; S o is the biochemical oxygen demand of the inlet water of the hydrodynamic circulation equipment, mg / L; S e is the biochemical oxygen demand of the outlet water of the hydrodynamic circulation equipment, mg / L; K de(T) is the microbial denitrification rate at temperature t, kg / (kg·d); X is the suspended solid concentration, g / L.

[0069] Furthermore, the proportion y of the mass of mixed liquid suspended solids in the total mass of mixed liquid total suspended solids, the sludge yield coefficient Y t and the suspended solid concentration X can be obtained through on-site measurement.

[0070] Further, the microbial denitrification rate K at temperature t de(T) The reference value of the microbial denitrification rate at 20°C is 0.05 kg / (kg·d).

[0071] Step S130: Determine the denitrification reaction characteristic length of the target shallow water area based on the nitrogen residence time under the initial circulation flow rate, equipment characteristic data, and hydrological characteristic data.

[0072] Among them, the denitrification reaction characteristic length of the target shallow water area can be obtained according to the nitrogen residence time under the initial circulation flow rate, equipment characteristic data (i.e., pipeline length and initial circulation flow rate), and hydrological characteristic data of the shallow water area (i.e., area and effective water depth).

[0073] Further, when the circulating water flow velocity V is constant, the length of the water flow passing through per unit time is consistent, and the following formula can be obtained:

[0074]

[0075] In the formula: t1 is the time for the water flow to pass through the length L1 of the denitrification reactor, that is, the nitrogen residence time under the initial circulation flow rate, with the unit of s; T s is the hydraulic residence time of the entire shallow water area, with the unit of s.

[0076] Further, the denitrification reaction characteristic length of the target shallow water area can be determined by the following formula:

[0077]

[0078] In the formula, L1 is the denitrification reaction characteristic length of the shallow water area, with the unit of m; L is the total length of the cross-section where the pipeline is buried in the shallow water area, with the unit of m; t is the nitrogen residence time under the initial circulation flow rate, with the unit of d; Q 初 is the initial circulation flow rate of the circulation pump, with the unit of m 3 / d; S is the water surface area of the shallow water area, with the unit of m 2 ; H is the effective water depth of the shallow water area, with the unit of m.

[0079] Step S140: Determine the target circulation flow rate of the hydrodynamic circulation equipment based on the denitrification reaction characteristic length of the target shallow water area and the target nitrogen removal amount.

[0080] In order to effectively address the problem of eutrophication in shallow water areas, it is necessary to determine an appropriate hydrodynamic circulation water flow rate. If the hydrodynamic circulation water flow rate is too large, the water body will be in a strong mixing state and cannot achieve an effective denitrification effect; if there is no hydrodynamic force, the pond will maintain its original state and the eutrophication problem will further deteriorate. Therefore, it is necessary to determine the optimal circulation water flow rate and the length of the denitrification reactor to maximize the nitrogen removal efficiency, thereby reducing nitrogen pollution and improving the ecological health level of the water body.

[0081] Further, according to the above steps S120 to S130, the denitrification reaction characteristic length and the expected nitrogen removal amount can be obtained, and the target circulation flow rate of the hydrodynamic circulation equipment can be calculated:

[0082]

[0083] In the formula, Q is the optimal circulation flow rate, with the unit of m 3 / d; L1 is the denitrification reaction characteristic length in the shallow water area, with the unit of m; L is the total length of the cross-section at the pipeline burial location in the shallow water area, with the unit of m; S is the water surface area of the shallow water area, with the unit of m 2 ; H is the effective water depth of the shallow water area, with the unit of m; K de(T) is the microbial denitrification rate at temperature T; X is the suspended solid concentration, with the unit of g / L; N k is the total nitrogen concentration of the influent water of the hydrodynamic equipment, with the unit of mg / L; N te is the total nitrogen concentration of the effluent water of the hydrodynamic circulation equipment, with the unit of mg / L; y is the proportion of the mass of the mixed liquid suspended solids in the total mass of the mixed liquid total suspended solids, with the unit of g / g; Y t is the sludge yield coefficient, with the unit of kg / kg; S o is the biochemical oxygen demand of the influent water of the hydrodynamic circulation equipment, with the unit of mg / L; S e is the biochemical oxygen demand of the effluent water of the hydrodynamic circulation equipment, with the unit of mg / L.

[0084] Based on the determined circulation flow rate value of the hydrodynamic circulation equipment, at different flow rates, according to the inlet and outlet water quality characteristic data such as the operating flow rate, the target effective water depth, area, and water body length of the shallow water area, and the TN concentration, as well as the expected denitrification efficiency, the optimal circulation flow rate of the hydrodynamic circulation equipment can be estimated to provide a reference for actual engineering applications.

[0085] In an alternative embodiment, in step S140, based on the denitrification reaction characteristic length and the expected nitrogen removal amount of the target shallow water area, determining the target circulation flow rate of the hydrodynamic circulation equipment includes:

[0086] Based on the denitrification reaction characteristic length and the nitrogen removal amount of the target shallow water area, obtain the current circulation flow rate of the hydrodynamic circulation equipment;

[0087] Based on the preset time and the current circulation flow rate, determine the current water quality of the target shallow water area. When the current water quality of the target shallow water area reaches the target water quality, the current circulation flow rate of the hydrodynamic circulation equipment is the target circulation flow rate.

[0088] In an alternative embodiment, in step S140, determining the current water quality of the target shallow water area based on a preset time and the current circulating flow rate further includes:

[0089] If the current water quality of the target shallow water area does not meet the target water quality, update the pipeline length and / or the number of circulating pumps until the current water quality of the target shallow water area meets the target water quality.

[0090] Specifically, calculate the current circulating flow rate of the hydrodynamic circulation equipment according to the denitrification reaction characteristic length of the target shallow water area and the required nitrogen removal amount; then calculate the water quality change of the target shallow water area according to the preset time and the current circulating flow rate. If the water quality of the target shallow water area meets the target water quality, it is determined that the current circulating flow rate is appropriate, that is, the optimal circulating flow rate; if the water quality of the target shallow water area does not meet the target water quality, adjust the pipeline length and / or the number of circulating pumps. That is, increasing the pipeline length can extend the water flow time, thereby improving the water quality purification efficiency, and / or increasing the number of circulating pumps can increase the circulating flow rate, thereby accelerating the water quality purification process. Through an iterative loop method, gradually optimize the circulating flow rate to ensure that the target shallow water area meets the expected water quality standard.

[0091] Through the method for determining the circulating water flow rate for denitrification targets in shallow water areas provided in the present invention, the optimal circulating flow rate and pipeline configuration are finally determined, enabling the hydrodynamic circulation equipment to complete the nitrogen removal function with the best efficiency and accurately control water quality parameters, achieving efficient nitrogen removal.

[0092] The embodiment of the present application provides a system for determining the circulating water flow rate for denitrification targets in shallow water areas. The system includes: a hydrodynamic circulation equipment and an electronic device 700; the hydrodynamic circulation equipment is connected to a processing module; the electronic device 700 is configured to: obtain the hydrological characteristic data of the target shallow water area, the inlet and outlet water quality characteristic data of the hydrodynamic circulation equipment, and the equipment characteristic data; determine the initial nitrogen removal amount of the hydrodynamic circulation equipment based on the hydrological characteristic data and the inlet and outlet water quality characteristic data of the hydrodynamic circulation equipment, and determine the nitrogen residence time under the initial circulating flow rate of the hydrodynamic circulation equipment; determine the denitrification reaction characteristic length of the target shallow water area based on the nitrogen residence time under the initial circulating flow rate, the equipment characteristic data, and the hydrological characteristic data; determine the target circulating flow rate of the hydrodynamic circulation equipment based on the denitrification reaction characteristic length of the target shallow water area and the target nitrogen removal amount.

[0093] As Figure 3 shown, in an alternative embodiment, the hydrodynamic circulation equipment includes a plurality of circulating pumps, and the plurality of circulating pumps are connected at equal intervals through pipelines.

[0094] It should be noted that the principle of the electronic device 700 provided in the embodiments of the present application to solve technical problems is similar to the method for determining the circulating water flow rate for denitrification targets in shallow water areas provided in the embodiments of the present application. Therefore, for the implementation of the electronic device 700 provided in the embodiments of the present application, reference can be made to the implementation of the method for determining the circulating water flow rate for denitrification targets in shallow water areas provided in the embodiments of the present application, and repeated parts will not be elaborated.

[0095] After introducing the method and system for determining the circulating water flow rate for denitrification targets in shallow water areas provided in the embodiments of the present application, next, a brief introduction to the electronic device provided in the embodiments of the present application will be given.

[0096] Referring to Figure 4 As shown, an electronic device provided in the embodiments of the present application at least includes: a processor 701, a memory 702, and a computer program stored on the memory 702 and executable on the processor 701. When the processor 701 executes the computer program, it implements the method for determining the circulating water flow rate for denitrification targets in shallow water areas provided in the embodiments of the present application.

[0097] The electronic device 700 provided in the embodiments of the present application may further include a bus 703 connecting different components (including the processor 701 and the memory 702). Among them, the bus 703 represents one or more of several types of bus structures, including a memory bus, a peripheral bus, a local bus, etc.

[0098] The memory 702 may include a readable medium in the form of a volatile memory, such as a random access memory (RAM) 7021 and / or a cache memory 7022, and may further include a read-only memory (ROM) 7023.

[0099] The memory 702 may further include a program tool 7027 having a set (at least one) of program modules 7024. The program modules 7024 include, but are not limited to: an operating subsystem, one or more application programs, other program modules, and program data. The implementation of a network environment may be included in each or some combination of these examples.

[0100] The electronic device 700 can also communicate with one or more external devices 704, and can also communicate with one or more devices that enable a user to interact with the electronic device 700 (such as a mobile phone, a computer, etc.), and / or communicate with any device that enables the electronic device 700 to communicate with one or more other electronic devices 700 (such as a router, a modem, etc.). Such communication can be carried out through an input / output (I / O) interface 705. Moreover, the electronic device 700 can also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through a network adapter 706. As Figure 4 shown, the network adapter 707 communicates with other modules of the electronic device 700 through a bus 703. It should be understood that, although Figure 4 not shown in the figure, the electronic device 700 can use other hardware and / or software modules, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, redundant arrays of independent disks (RAID) subsystems, tape drives, and data backup storage subsystems, etc.

[0101] In the embodiments of the present application, data such as water temperature, suspended solid concentration, total nitrogen, and biochemical oxygen demand collected by sensors at multiple sampling positions in the shallow water area are used as input data of the electronic device 700. After the electronic device 700 analyzes and processes multiple inputs, multiple external devices 704 are controlled based on the results of the analysis and processing. Among them, the multiple external devices 704 include but are not limited to parameters such as the number and flow rate of circulation pumps.

[0102] It should be noted that Figure 4 the electronic device 700 shown is only an example, and should not impose any limitation on the functions and usage scope of the embodiments of the present application.

[0103] In addition, the embodiments of the present application also provide a computer-readable storage medium. The computer-readable storage medium stores computer instructions. When the computer instructions are executed by a processor of the electronic device 700, the method for determining the circulating water flow rate for denitrification targets in the shallow water area provided by the embodiments of the present application is implemented. Specifically, the executable program can be built into the electronic device 700. In this way, the electronic device 700 can implement the method for determining the circulating water flow rate for denitrification targets in the shallow water area provided by the embodiments of the present application by the processor executing the built-in executable program.

[0104] Moreover, the method for determining the recirculating water flow rate for denitrification targets in a shallow water area provided by the embodiments of the present application can also be implemented as a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, it implements the method for determining the recirculating water flow rate for denitrification targets in a shallow water area provided by the embodiments of the present application.

[0105] The computer program product provided by the embodiments of the present application can adopt any combination of one or more readable media. Among them, the readable media can be a readable signal medium or a readable storage medium, and the readable storage medium can be, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or component, or any combination of the above. Specifically, more specific examples (non-exhaustive list) of the readable storage medium include: an electrical connection with one or more wires, a portable disk, a hard disk, RAM, ROM, an erasable programmable read-only memory (EPROM), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0106] The computer program product provided by the embodiments of the present application can adopt a CD-ROM and include a computer program, and can also run on electronic devices such as computers and user terminals 700. However, the computer program product provided by the embodiments of the present application is not limited to this. In the embodiments of the present application, the readable storage medium can be any tangible medium that contains or stores a program, and this program can be used by or in combination with an instruction execution system, device, or component.

[0107] It should be noted that although several units or subunits of the device are mentioned in the above detailed description, this division is merely exemplary and not mandatory. In fact, according to the embodiments of the present application, the features and functions of the two or more units described above can be embodied in one unit. Conversely, the features and functions of one unit described above can be further divided and embodied by multiple units.

[0108] In addition, although the operations of the method of the present application are described in a specific order in the drawings, this does not require or imply that these operations must be performed in that specific order, or that all the operations shown must be performed to achieve the desired result. Additionally or alternatively, some steps can be omitted, multiple steps can be combined into one step for execution, and / or one step can be decomposed into multiple steps for execution.

[0109] Although the preferred embodiments of the present application have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once they learn the basic creative concept. Therefore, the appended claims are intended to be interpreted to include the preferred embodiments as well as all changes and modifications that fall within the scope of the present application.

[0110] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. A method for determining the circulating water flow rate for denitrification targets in shallow water areas, characterized in that, Including: Obtain the hydrological characteristic data of the target shallow water area, the inlet and outlet water quality characteristic data of the hydrodynamic circulation equipment, and the equipment characteristic data; Based on the hydrological characteristic data and the inlet and outlet water quality characteristic data of the hydrodynamic circulation equipment, determine the initial nitrogen removal amount of the hydrodynamic circulation equipment, and determine the nitrogen residence time at the initial circulation flow rate of the hydrodynamic circulation equipment; Based on the nitrogen residence time at the initial circulation flow rate, the equipment characteristic data, and the hydrological characteristic data, determine the denitrification reaction characteristic length of the target shallow water area; Based on the denitrification reaction characteristic length of the target shallow water area and the target nitrogen removal amount, determine the target circulation flow rate of the hydrodynamic circulation equipment.

2. The method for determining the circulating water flow rate for denitrification target in a shallow water area according to claim 1, wherein The hydrological characteristic data includes the area and water depth of the target shallow water area; the water quality characteristics include water temperature, suspended solid concentration, total nitrogen, and biochemical oxygen demand; the equipment characteristic data includes the pipeline length and the initial circulation flow rate of the circulation pump.

3. The method for determining the circulating water flow rate for denitrification target in the shallow water area according to claim 2, wherein Obtain the inlet and outlet water quality characteristic data of the hydrodynamic circulation equipment, including: Obtain the water temperature, suspended solid concentration, total nitrogen, and biochemical oxygen demand collected by sensors at the sampling positions set in the shallow water area as the inlet and outlet water quality characteristic data; wherein, the sampling positions include the inlet and outlet of the hydrodynamic circulation equipment.

4. The method for determining the circulating water flow rate for denitrification target in the shallow water area according to claim 3, wherein Based on the hydrological characteristic data and the inlet and outlet water quality characteristic data of the hydrodynamic circulation equipment, determine the initial nitrogen removal amount of the hydrodynamic circulation equipment, and determine the nitrogen residence time at the initial circulation flow rate of the hydrodynamic circulation equipment, including: Determine the nitrogen residence time at the initial circulation flow rate of the target shallow water area through the following formula: Wherein, t is the nitrogen residence time under the initial circulation flow rate, with the unit of d; V n is the volume of the denitrification reactor, with the unit of m 3 ; Q 初 is the initial circulation flow rate of the circulation pump, with the unit of m 3 / d; L1 is the characteristic length of the denitrification reaction in the shallow water area, with the unit of m; V is the flow velocity of the circulating water, m / s; N k is the total nitrogen concentration of the influent water of the hydrodynamic equipment, with the unit of mg / L, N te is the total nitrogen concentration of the effluent water of the hydrodynamic circulation equipment, with the unit of mg / L; y is the proportion of the mass of the mixed liquid suspended solids in the total suspended solids of the mixed liquid, g / g; Y t is the sludge yield coefficient, kg / kg; S o is the biochemical oxygen demand of the influent water of the hydrodynamic circulation equipment, mg / L; S e is the biochemical oxygen demand of the effluent water of the hydrodynamic circulation equipment, mg / L; K de(T) is the microbial denitrification rate at temperature t, kg / (kg·d); X is the suspended solid concentration, g / L.

5. The method for determining the circulating water flow rate for denitrification target in the shallow water area according to claim 4, wherein Based on the nitrogen residence time at the initial circulation flow rate, the equipment characteristic data, and the hydrological characteristic data, determine the denitrification reaction characteristic length of the target shallow water area, including: Determine the denitrification reaction characteristic length of the target shallow water area through the following formula: Wherein, L1 is the characteristic length of the denitrification reaction in the shallow water area, with the unit of m; L is the total length of the cross-section at the pipeline buried in the shallow water area, with the unit of m; t is the nitrogen residence time at the initial circulation flow rate of the circulation pump in the target shallow water area, with the unit of d; Q 初 is the initial circulation flow rate of the circulation pump, with the unit of m 3 / d; S is the water surface area of the shallow water area, with the unit of m 2 ; H is the effective water depth of the shallow water area, with the unit of m.

6. The method for determining the circulating water flow rate for denitrification target in the shallow water area according to claim 5, characterized in that, Based on the denitrification reaction characteristic length of the target shallow water area and the target nitrogen removal amount, determine the target circulation flow rate of the hydrodynamic circulation equipment, including: Determine the target circulation flow rate of the hydrodynamic circulation equipment through the following formula: Wherein, Q is the optimal circulation flow rate, with the unit of m 3 / d; K de(T) is the microbial denitrification rate at temperature t; X is the suspended solid concentration, with the unit of g / L; N k is the total nitrogen concentration of the influent water of the hydrodynamic equipment, with the unit of mg / L; N te is the total nitrogen concentration of the effluent water of the hydrodynamic circulation equipment, with the unit of mg / L; y is the proportion of the mass of the mixed liquid suspended solids in the total mass of the mixed liquid suspended solids, with the unit of g / g; Y t is the sludge yield coefficient, with the unit of kg / kg; S o is the biochemical oxygen demand of the influent water of the hydrodynamic circulation equipment, with the unit of mg / L; S e is the biochemical oxygen demand of the effluent water of the hydrodynamic circulation equipment, with the unit of mg / L.

7. The method for determining the circulating water flow rate for denitrification target in shallow water areas according to any one of claims 1-6, characterized in that Based on the denitrification reaction characteristic length of the target shallow water area and the desired nitrogen removal amount, determine the target circulation flow rate of the hydrodynamic circulation equipment, including: Based on the denitrification reaction characteristic length of the target shallow water area and the desired nitrogen removal amount, obtain the current circulation flow rate of the hydrodynamic circulation equipment; Based on the preset time and the current circulation flow rate, determine the current water quality of the target shallow water area. When the current water quality of the target shallow water area reaches the target water quality, the current circulation flow rate of the hydrodynamic circulation equipment is the target circulation flow rate.

8. The method for determining the circulating water flow rate for denitrification target in a shallow water area according to claim 7, wherein Based on the preset time and the current circulation flow rate, determine the current water quality of the target shallow water area, further including: If the current water quality of the target shallow water area does not reach the target water quality, update the pipeline length and / or the number of circulation pumps until the current water quality of the target shallow water area reaches the target water quality.

9. A system for determining the circulating water flow rate for denitrification targets in shallow water areas, characterized in that, Including: A hydrodynamic circulation equipment and an electronic device; the hydrodynamic circulation equipment is connected to the electronic device; The electronic device is used for: obtaining the hydrological characteristic data of the target shallow water area, the inlet and outlet water quality characteristic data of the hydrodynamic circulation device, and the device characteristic data; determining the initial nitrogen removal amount of the hydrodynamic circulation device based on the hydrological characteristic data and the inlet and outlet water quality characteristic data of the hydrodynamic circulation device, and determining the nitrogen residence time at the initial circulation flow rate of the hydrodynamic circulation device; determining the denitrification reaction characteristic length of the target shallow water area based on the nitrogen residence time at the initial circulation flow rate, the device characteristic data, and the hydrological characteristic data; and determining the target circulation flow rate of the hydrodynamic circulation device based on the denitrification reaction characteristic length of the target shallow water area and the target nitrogen removal amount.

10. The system for determining the circulating water flow rate for denitrification target in a shallow water area according to claim 9, wherein, It includes: The hydrodynamic circulation device includes a plurality of circulation pumps, and the plurality of circulation pumps are connected at equal intervals through pipelines.

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