Water changing system and water changing method for controlling density of blue-green algae in urban river
By using dynamic water quality monitoring and cyanobacteria growth model to predict cyanobacteria density, combined with the design of water delivery system and overflow weir, the problems of water resource waste and insufficient algae control effect in the control of cyanobacteria density in urban rivers were solved, and efficient and low-cost cyanobacteria management was achieved.
Patent Information
- Application Number
- CN202511168020.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-20
- Publication Date
- 2025-10-17
AI Technical Summary
Existing water exchange methods have problems of wasting water resources and insufficient algae control when controlling the density of cyanobacteria in urban rivers. In addition, manual removal is inefficient and costly, and easily causes secondary pollution.
Dynamic water quality monitoring devices are used to monitor river water quality parameters and meteorological data in real time. The density is predicted based on the growth characteristics of cyanobacteria. Clean water is delivered to the river through water delivery mechanisms. The cyanobacteria growth dynamics model is used to control the cyanobacteria density. Overflow weirs are set up to achieve water circulation and flood discharge. Water lifting devices and sewage nets are used to improve water quality.
It achieves precise control of water resources, reduces the density of blue algae, avoids water waste, ensures river safety, improves algae control effects, and reduces labor costs and secondary pollution.
Smart Images
Figure CN120797589A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of water body ecological management, and particularly relates to a water replacement system and a water replacement method for controlling cyanobacteria density of urban river. BACKGROUND
[0002] With the development of industry and agriculture and the acceleration of urbanization, water pollution is becoming increasingly serious, and cyanobacterial blooms have become a problem in water ecological environment management. Cyanobacterial blooms can reduce water transparency, destroy biodiversity, and cause problems such as blockage of water supply systems and pollution of drinking water sources, which seriously threaten the ecological system and life safety.
[0003] The water area of urban river is small, the water depth is shallow, and the flowability is poor. The pollution of combined sewer overflow and green belt pesticides directly enters the river, which can cause the cyanobacteria density to increase significantly. In many urban rivers, cyanobacteria can be removed by physical salvage technology, such as using algae separation devices and enclosure fences for manual removal. The algae separation device removes the cyanobacteria by filtering or air flotation. The enclosure fence removes the cyanobacteria by setting a net at a key location in the river to facilitate manual or mechanical salvage. However, manual removal is low in efficiency, high in labor cost, and easy to cause secondary pollution.
[0004] In recent years, water replacement dilution methods have also been used to control the cyanobacteria density of urban rivers. However, the current water replacement method does not consider the growth characteristics of cyanobacteria and the slow recovery of the ecological system after water replacement, lacks scientific basis, and causes waste of water resources or insufficient cyanobacteria control effect. SUMMARY
[0005] Therefore, the present application provides a water replacement system and a water replacement method for controlling cyanobacteria density of urban rivers to solve the problem of waste of water resources or insufficient cyanobacteria control effect caused by water replacement dilution of cyanobacteria density.
[0006] In a first aspect, the present application provides a water replacement system for controlling cyanobacteria density of urban rivers, comprising:
[0007] a water delivery mechanism, the water delivery mechanism comprising a driving device, a water lifting device, and a water delivery pipeline, the driving device being connected to the water lifting device, the water lifting device being arranged in a water body, and one end of the water delivery pipeline being connected to the water lifting device and the other end being located in the river;
[0008] a dynamic water quality monitoring device, the dynamic water quality monitoring device being arranged in the river and being electrically connected to the driving device.
[0009] Advantages
[0010] The dynamic water quality monitoring device monitors the water quality parameters of the river channel in real time, such as pH value, turbidity, dissolved oxygen, and meteorological data such as illumination and wind speed, and predicts the cyanobacteria density in combination with the growth characteristics of cyanobacteria. When the cyanobacteria density is predicted to exceed the threshold value, the dynamic water quality monitoring device outputs a signal to the water delivery mechanism, so that the cleaner water in the water intake body is delivered to the river channel, thereby reducing the cyanobacteria density. When the cyanobacteria density is reduced to below the threshold value, the dynamic water quality monitoring device outputs a signal to the water delivery mechanism to stop water delivery. By setting the dynamic water quality monitoring device, precise control of water resources can be achieved, and large-scale waste of water resources can be avoided. Moreover, the dynamic water quality monitoring device can dynamically predict the cyanobacteria density, and the effect of controlling cyanobacteria is good.
[0011] In an optional embodiment, the water replacement system for controlling the cyanobacteria density of the urban river channel further comprises an overflow weir arranged between the water intake body and the river channel, and one end of the water delivery pipeline penetrates through the overflow weir and extends into the river channel.
[0012] Advantages
[0013] When water is delivered from the water intake body to the river channel, the water level in the river channel gradually rises, at which time the overflow weir is opened, and overflow is used to the water intake body by utilizing the water level difference, so as to realize water circulation and prevent the water level of the river channel from being too high to affect flood discharge. Moreover, when the water level of the river channel rises rapidly due to short-time heavy rain, the overflow weir can be used for overflow and flood discharge, thereby ensuring the safety of the river channel for flood discharge.
[0014] In an optional embodiment, the water lifting device is a water pump, and the water pump is arranged at the middle part of the water intake body.
[0015] Advantages
[0016] The water pump is arranged at the middle part of the water intake body, so that the water body with low cyanobacteria density and less pollution can be extracted and delivered to the river channel, thereby effectively reducing the cyanobacteria density in the river channel.
[0017] In an optional embodiment, the water inlet of the water lifting device is provided with a trash screen.
[0018] Advantages
[0019] The trash screen can intercept pollutants in the water, thereby improving the water quality and preventing water pollution after the water is delivered to the river channel.
[0020] In an optional embodiment, the water inlet of the water lifting device is provided with a water quality sensor.
[0021] Advantages
[0022] The water quality sensor can monitor the water quality of the water flow entering the water lifting device in real time, thereby avoiding that the high-density cyanobacteria is delivered to the river channel with the water flow and affecting the control effect of the cyanobacteria density in the river channel.
[0023] In an alternative embodiment, the driving device is an electric motor, which is located above the water surface of the water body, and the electric motor is connected to the water lifting device through a transmission shaft.
[0024] Advantages
[0025] The electric motor is arranged above the water surface, which does not need to add additional waterproof facilities, saves cost, and is also convenient for maintenance of the electric motor.
[0026] In a second aspect, the present application also provides a water exchange method for controlling the density of blue-green algae in urban river channels, which is applied to a water exchange system and comprises:
[0027] The dynamic water quality monitoring device detects environmental parameters, and predicts the density of blue-green algae by using the environmental parameters through a blue-green algae growth kinetics model;
[0028] When the predicted density of blue-green algae exceeds a threshold value, the water delivery mechanism delivers clean water in the water body to the river channel;
[0029] When the density of blue-green algae in the river channel is lower than the threshold value, the water delivery mechanism stops water delivery.
[0030] Advantages
[0031] The dynamic water quality monitoring device can monitor key parameters of water quality and meteorological environmental parameters in the river channel in real time, and can accurately predict the density trend of blue-green algae by using these parameters through a blue-green algae growth kinetics model. When the predicted density of blue-green algae exceeds a threshold value, the dynamic water quality monitoring device outputs a signal to control the water delivery mechanism to deliver clean water with low blue-green algae density and less pollution in the water body to the river channel to reduce the density of blue-green algae in the river channel. When the predicted density of blue-green algae in the river channel is lower than the threshold value, the water delivery mechanism stops water delivery. In this way, the water can be delivered quantitatively, avoiding waste of water resources, and the control effect of the density of blue-green algae in the river channel is good.
[0032] In an alternative embodiment, the step of delivering clean water in the water body to the river channel when the predicted density of blue-green algae exceeds a threshold value further comprises:
[0033] Adjusting the water flow velocity in the river channel to 0.1-0.3 m / s through the water lifting device to destroy the static water gathering conditions of blue-green algae.
[0034] Advantages
[0035] The water flow environment in the river channel during water delivery can be adjusted through the water lifting device, so as to destroy the static water gathering of blue-green algae, which is conducive to reducing the density of blue-green algae, and also avoids suspension of river channel sediment.
[0036] In an alternative embodiment, the method for controlling cyanobacteria density in urban river further comprises:
[0037] After the river level is raised, the overflow weir is opened to cause the river water to overflow into the water intake body.
[0038] In an alternative embodiment, the method for controlling cyanobacteria density in urban river further comprises: when the river level is rapidly raised due to short-time heavy rainfall, the overflow weir is opened to cause the river water to overflow into the water intake body to discharge floodwater.
[0039] Advantages
[0040] When heavy rainfall occurs, the river level is raised, and the overflow weir can be used to discharge floodwater to ensure the safety of the river. BRIEF DESCRIPTION OF DRAWINGS
[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0042] Fig. 1 Fig. 1 is a schematic diagram of the water exchange system for controlling cyanobacteria density in urban river according to the present application.
[0043] Fig. 2 Fig. 2 is a top view of the water exchange system for controlling cyanobacteria density in urban river according to the present application.
[0044] Legend of the drawings:
[0045] 1. water delivery mechanism
[0046] 11. driving device
[0047] 12. water lifting device
[0048] 13. water delivery pipeline
[0049] 14. transmission shaft
[0050] 2. water intake body
[0051] 3. river
[0052] 4. dynamic water quality monitoring device
[0053] 5. overflow weir DETAILED DESCRIPTION
[0054] The technical solutions of the present application will be described clearly and completely in connection with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0055] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0056] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0057] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.
[0058] The embodiments of the present application will be described below in connection with Figs. 1-2 .
[0059] According to the embodiments of the present application, on the one hand, a water exchange system for controlling the density of blue-green algae in urban river is provided. The water exchange system comprises a water conveying mechanism 1 and a dynamic water quality monitoring device 4. The water conveying mechanism 1 comprises a driving device 11, a water lifting device 12 and a water conveying pipeline 13, the driving device 11 is connected with the water lifting device 12, the water lifting device 12 is arranged in a water body 2, one end of the water conveying pipeline 13 is connected with the water lifting device 12, and the other end is located in a river 3. The dynamic water quality monitoring device 4 is arranged in the river 3 and electrically connected with the driving device 11.
[0060] The density of blue-green algae in the river 3 will increase after the growth and accumulation of blue-green algae, thereby causing the problem of blue-green algae bloom. By setting the dynamic water quality monitoring device 4 in the river 3 to monitor various data, the growth of blue-green algae and the trend of density change can be predicted. The dynamic water quality monitoring device 4 collects multiple sensors, thereby monitoring water temperature, dissolved oxygen (DO), pH value, chlorophyll a concentration (Chl-a), total phosphorus (TP), total nitrogen (TN) and other parameters in the river 3, and obtaining meteorological data such as light intensity and wind speed. These parameters directly or indirectly affect the growth of blue-green algae. Then, according to the above parameters monitored by the dynamic water quality monitoring device 4, the blue-green algae growth kinetics model is used to predict the blue-green algae growth rate / density change. In turn, it is determined when the blue-green algae density in the river 3 needs to be controlled by the method of water exchange dilution.
[0061] The water delivery mechanism 1 is used to perform water exchange dilution, in which the driving device 11 provides power for the water pumping device 12 to work. The water pumping device 12 can extract water from the water body 2, which has lower blue-green algae density and less pollution. After being transported to the river 3 through the water delivery pipeline 13, it can be diluted to reduce the density of blue-green algae in the river 3. The dynamic water quality monitoring device 4 is electrically connected with the driving device 11, so that when the dynamic water quality monitoring device 4 predicts that the blue-green algae density in the river 3 exceeds the threshold value, the driving device 11 is started to drive the water pumping device 12 to use the water delivery pipeline 13 to deliver water, realizing the linkage of the dynamic water quality monitoring device 4 and the water delivery mechanism 1.
[0062] And the water body 2 can choose an existing water body, such as a nearby lake, so that the water exchange dilution can be realized by using natural water resources, realizing the utilization of natural water resources, and the cost of water exchange system arrangement is low.
[0063] The dynamic water quality monitoring device 4 can realize the monitoring of various environmental factors, accurately predict the change of blue-green algae density in the river 3, and then timely control the water delivery mechanism 1 to work or stop. It can realize the quantitative and accurate delivery and utilization of water resources, avoid the waste of water resources, and also can realize the accurate control of blue-green algae concentration in the river 3, and the control effect is good.
[0064] In one embodiment, the water exchange system for controlling the blue-green algae density of the urban river 3 further comprises an overflow weir 5, which is arranged between the water body 2 and the river 3, and one end of the water delivery pipeline 13 penetrates the overflow weir 5 and extends into the river 3.
[0065] The overflow weir 5 is located between the water body 2 and the river 3, and prevents the natural flow of water between the water body 2 and the river 3. In order to realize the smooth delivery of water flow in the water exchange dilution work, one end of the water delivery pipeline 13 needs to penetrate the overflow weir 5, so that the two ends can be located in the water body 2 and the river 3 respectively.
[0066] When water is transported from the water body 2 to the river channel 3, the water level of the river channel 3 gradually rises, at which time the overflow weir 5 valve can be opened to allow the water in the river channel 3 to overflow into the water body 2. The circulation of water flow is achieved, and the water level of the river channel 3 is prevented from being too high to affect the safety of flood discharge.
[0067] In an embodiment, the driving device 11 is an electric motor, which is located above the water surface of the water body 2 and is connected to the water lifting device 12 through a transmission shaft 14.
[0068] The driving device 11 is preferably an electric motor, which is arranged on a structure above the water surface of the water body 2 to prevent the motor from being damaged by water. The motor is connected to the water lifting device 12 through a transmission shaft 14 to achieve power transmission and drive the water lifting device 12 to work.
[0069] In an embodiment, the water lifting device 12 is a water pump, which is arranged in the middle of the water body 2.
[0070] The water lifting device 12 is preferably a water pump, which can extract water from the water body 2 and transport it away through the water pipeline 13 under the drive of the motor.
[0071] Further, the water pump is arranged in the middle of the water body 2 to extract water flow with low cyanobacteria density and less pollution, which is more conducive to the control of cyanobacteria density in the river channel 3 and can reduce water pollution in the river channel 3. If the water pump is arranged in the upper part of the water body 2, it may extract water flow with high cyanobacteria density, which is not conducive to the control of cyanobacteria density in the river channel 3. If the water pump is arranged in the lower part of the water body 2, the bottom mud and silt deposited in the water body 2 may block the water lifting device 12, causing failure.
[0072] In an embodiment, the water inlet of the water lifting device 12 is provided with a pollution blocking net.
[0073] The pollution blocking net in the form of a grid can be arranged at the water inlet of the water lifting device 12 to achieve preliminary filtration of pollutants, and the smaller the mesh size, the higher the filtration precision.
[0074] The pollution blocking net can prevent pollution from blocking the water lifting device 12 and improve the water quality transported to the river channel 3 to reduce water pollution in the river channel 3.
[0075] In an embodiment, the water inlet of the water lifting device 12 is provided with a water quality sensor.
[0076] The water quality sensor can detect the water quality of the water flow entering the water lifting device 12 to avoid the delivery of high-density cyanobacteria or pollutants to the river channel 3.
[0077] In another aspect, the embodiment also provides a water exchange method for controlling cyanobacteria density in urban river 3, which is applied to a water exchange system. The structure of the water exchange system is the same as that described in the above embodiment, and will not be repeated here.
[0078] The water exchange method comprises:
[0079] The dynamic water quality monitoring device 4 detects environmental parameters and predicts cyanobacteria density according to the environmental parameters;
[0080] The dynamic water quality monitoring device 4 can monitor various parameters of the water body in the river 3 in real time, including water temperature, dissolved oxygen (DO), pH value, chlorophyll a concentration (Chl-a), total phosphorus (TP), and total nitrogen (TN). It can also detect meteorological parameters, including light intensity and wind speed. These parameters directly or indirectly affect the growth of cyanobacteria. According to these parameters, the growth of cyanobacteria can be predicted by a cyanobacteria growth kinetics model, and the trend of cyanobacteria density change can be accurately predicted.
[0081] When the predicted cyanobacteria density exceeds the threshold value, the water delivery mechanism 1 delivers clean water in the water intake body 2 to the river 3;
[0082] The threshold value can be preset, for example, it can be set to 2 million / L. When the predicted cyanobacteria density exceeds the threshold value, the dynamic water quality monitoring device 4 outputs a signal to control the driving device 11 to work, thereby driving the water lifting device 12 to start, and the water in the water intake body 2 is delivered to the river 3 through the water delivery pipeline 13. Since the water in the water intake body 2 has low cyanobacteria concentration and less pollutants, it can play a good dilution effect after being delivered to the river 3, thereby reducing the cyanobacteria density in the river 3.
[0083] When the cyanobacteria density in the river 3 is lower than the threshold value, the water delivery mechanism 1 stops delivering water.
[0084] The dynamic water quality monitoring device 4 monitors in real time, and when the predicted cyanobacteria density is lower than the threshold value, the water delivery mechanism 1 stops delivering water. This completes the water exchange and dilution work.
[0085] In one embodiment, when the predicted cyanobacteria density exceeds the threshold value, the water delivery mechanism 1 delivers clean water in the water intake body 2 to the river 3, which further comprises:
[0086] The water lifting device 12 adjusts the water flow velocity in the river 3 to 0.1-0.3 m / s to destroy the static water gathering conditions of cyanobacteria.
[0087] The water flow in the river channel 3 is originally in a natural state, and the flow rate is gentle. When the water delivery mechanism 1 delivers water to the river channel 3, the water flow state of the river channel 3 can be changed by using the water lifting device 12. The water flow rate in the river channel 3 is 0.1-0.3 m / s, which destroys the static water gathering condition of blue-green algae and effectively inhibits the formation of blue-green algae bloom. However, the disturbance at this flow rate does not destroy the living environment of benthic organisms and submerged plants, and the algae control effect and ecological stability of the river channel 3 are considered.
[0088] In one embodiment, when the predicted blue-green algae density exceeds the threshold value, the water delivery mechanism 1 delivers clean water in the water intake body 2 to the river channel 3, and when the blue-green algae density in the river channel 3 is lower than the threshold value, the water delivery mechanism 1 stops the water delivery step. Between the above steps, the water delivery mechanism 1 further includes:
[0089] After the water level of the river channel 3 rises, the overflow weir 5 is opened to overflow the water in the river channel 3 to the water intake body 2.
[0090] As the water delivery mechanism 1 delivers water to the river channel 3, the water level of the river channel 3 gradually rises, at which time the overflow weir 5 can be opened to overflow the water flow in the river channel 3 to the water intake body 2, realizing the circulation of the water flow. At the same time, it can also prevent the water level of the river channel 3 from being too high, affecting the flood discharge.
[0091] In one embodiment, the water replacement method for controlling the blue-green algae density of the urban river channel 3 further includes: when the water level of the river channel 3 rises rapidly due to short-term heavy rain, the overflow weir 5 is opened to overflow the water flow in the river channel 3 to the water intake body 2 to discharge flood.
[0092] In severe weather conditions, when encountering heavy rain, the water level of the river channel 3 will rise rapidly. At this time, the overflow weir 5 can be used to discharge the water flow in the river channel 3 to the water intake body 2, which can also improve the flood discharge safety and flood control capacity of the river channel 3.
[0093] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.
Claims
1. A water exchange system for controlling the density of cyanobacteria in urban rivers, characterized in that: include: A water delivery mechanism (1), the water delivery mechanism (1) comprising: a driving device (11), a water lifting device (12) and a water delivery pipeline (13); the driving device (11) is connected to the water lifting device (12); the water lifting device (12) is arranged in a water intake body (2); one end of the water delivery pipeline (13) is connected to the water lifting device (12), and the other end is located in a river channel (3); A dynamic water quality monitoring device (4) is provided in the river channel (3) and is electrically connected to the driving device (11).
2. The water exchange system for controlling the density of blue algae in urban rivers according to claim 1, characterized in that: It also includes an overflow weir (5), which is arranged between the water intake body (2) and the river channel (3), and one end of the water delivery pipeline (13) passes through the overflow weir (5) and extends into the river channel (3).
3. The water exchange system for controlling the density of blue algae in urban rivers according to claim 1 or 2, characterized in that: The water-lifting device (12) is a water pump, and the water pump is arranged in the middle of the water intake body (2).
4. The water exchange system for controlling the density of blue algae in urban rivers according to claim 3, characterized in that: The water inlet of the water lifting device (12) is provided with a trash net.
5. The water exchange system for controlling the density of blue algae in urban rivers according to claim 4, characterized in that: The water inlet of the water pumping device (12) is provided with a water quality sensor.
6. The water exchange system for controlling the density of blue algae in urban rivers according to claim 1 or 2, characterized in that: The driving device (11) is a motor, which is located above the water surface of the water intake body (2) and is connected to the water lifting device (12) via a transmission shaft (14).
7. A water exchange method for controlling the density of cyanobacteria in urban rivers, applied to the water exchange system according to any one of claims 1 to 6, characterized in that: include: A dynamic water quality monitoring device (4) detects environmental parameters and uses the environmental parameters to predict the density of cyanobacteria through a cyanobacteria growth dynamics model; When the predicted cyanobacteria density exceeds a threshold, the water delivery mechanism (1) delivers clean water from the intake water body (2) to the river (3); When the density of blue algae in the river channel (3) is lower than a threshold value, the water delivery mechanism (1) stops delivering water.
8. The water exchange method for controlling the density of blue algae in urban rivers according to claim 7, characterized in that: The step of the water delivery mechanism (1) delivering the clean water from the intake water body (2) to the river (3) when the predicted blue algae density exceeds a threshold value further includes: The water flow velocity in the river channel (3) is adjusted to 0.1-0.3 m / s by a water lifting device (12), thereby destroying the static water aggregation conditions of blue algae.
9. The water exchange method for controlling the density of blue algae in urban rivers according to claim 7, characterized in that: The steps of the water delivery mechanism (1) delivering the clean water in the intake water body (2) to the river channel (3) when the predicted blue algae density exceeds the threshold value and the water delivery mechanism (1) stopping the water delivery when the blue algae density in the river channel (3) is lower than the threshold value further include: After the water level of the river channel (3) rises, the overflow weir (5) is opened to allow the water in the river channel (3) to overflow into the water intake body (2).
10. The water exchange method for controlling the density of blue algae in urban rivers according to claim 7, characterized in that: Also includes: When a short-term heavy rainfall occurs, the water level of the river channel (3) rises rapidly, and the overflow weir (5) is opened to allow the water in the river channel (3) to overflow into the water intake body (2) to discharge the flood.