Urban water resource multi-scene coordinated utilization and flood control regulation system

Abstract

The utility model belongs to the technical field of water conservancy project and town water environment treatment, specifically relates to a town water resource multi -scene coordinated utilization and flood control system, system contains physical infrastructure unit, monitoring unit, control unit, execution unit and reuse unit, constructs the closed -loop system of " monitoring - control - execution - feedback", is based on the measured data of the monitoring unit of distributed setting, and control unit compares measured value and set value according to identifying rainfall intensity, rainwater quality, pipe network load, idle capacity of sewage treatment plant, river water level and reuse demand and so on multidimensional working condition, according to the comparison result, sends out control command and matches three big operation modes, realizes rainwater maximization reuse, pollution accurate reduction, waterlogging effective prevention and control, satisfies municipal, agricultural, ecological multiple water demand simultaneously, alleviates water resource supply and demand contradiction, promotes town water system toughness.

Description

Technical Field

[0001] This utility model belongs to the field of water conservancy engineering and urban water environment management technology, specifically involving a multi-scenario collaborative utilization and flood control system for urban water resources. This system integrates rainwater collection and storage, deep sewage treatment, diversified water resource reuse and flood control and drainage functions. It is applicable to towns in North China and similar climate zones, and can achieve synergistic optimization of efficient water resource utilization, precise pollution control and urban waterlogging risk management under different rainfall conditions. Background Technology

[0002] North my country has a semi-humid, semi-arid continental monsoon climate, with annual precipitation of 400–800 mm, 80% of which is concentrated in the flood season from June to September. Rainfall is unevenly distributed in time and space, leading to alternating floods and droughts. The region has a high demand for agricultural water, but most towns lack adequate rainwater harvesting systems, resulting in rainwater runoff during the flood season and water shortages during the non-flood season, highlighting a significant imbalance between water supply and demand.

[0003] Accelerated urbanization has increased the proportion of impervious surfaces, leading to a higher surface runoff coefficient, earlier flood peaks, and a rising risk of urban flooding. In the initial stages of rainfall, rainwater carrying pollutants such as COD and NH3-N is directly discharged, causing non-point source pollution. Traditional stormwater management relies on a "rapid end-of-pipe discharge" model, focusing solely on drainage while neglecting rainwater resource utilization and pollution control, making it ill-suited to address the challenges of high-intensity rainfall.

[0004] Existing urban wastewater treatment facilities generally suffer from a mismatch between their designed capacity and actual treatment volume, resulting in idle capacity. A typical wastewater treatment plant has an idle daily treatment capacity of up to 7000 m³. 3 Furthermore, this idle capacity was not effectively utilized in rainfall scenarios, resulting in the dual problems of resource waste and low rainwater resource utilization rate.

[0005] In addition, the existing rainwater and sewage separation system has three major defects: First, the sensing dimension is singular, relying only on a single point rain gauge, without considering the spatial heterogeneity of rainfall, and the monitoring data is not representative enough, which can easily lead to misjudgment of control; second, the control logic is rigid, switching modes only according to a fixed rainfall threshold, without integrating multi-source information for collaborative decision-making, resulting in poor adaptability; third, the treatment units are fragmented, with each facility operating independently, lacking dynamic matching and efficiency feedback mechanisms, and unable to be optimized globally.

[0006] In summary, existing technologies are insufficient to solve a series of problems related to urban water resources, pollution, flood control, and resource utilization. There is an urgent need to build a comprehensive system that enables multi-facility collaboration, multi-parameter sensing, and dynamic intelligent control. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a multi-scenario collaborative utilization and flood control system for urban water resources. By adopting infrastructure units, monitoring units, control units, execution units, and reuse units, a closed-loop system of "monitoring-control-execution-feedback" is constructed to maximize the utilization of rainwater resources, optimize the reduction of pollution load, and accurately prevent and control urban waterlogging risks under different rainfall scenarios. At the same time, it meets the diverse water needs of towns and cities and alleviates the contradiction between water supply and demand in towns and cities in North China and similar climate zones.

[0008] The overall technical concept of this utility model is:

[0009] The urban water resource multi-scenario collaborative utilization and flood control system includes an infrastructure unit, a monitoring unit, a control unit, an execution unit, and a reuse unit. Rainwater collected by the infrastructure unit is output through three channels via the rainwater pipe network. The first channel is treated at a sewage treatment plant and then connected to the municipal miscellaneous reuse pipe network of the reuse unit. The second channel is treated at a subsurface flow wetland and then connected to the farmland irrigation reuse pipe network of the reuse unit. The third channel is connected to the ecological water replenishment reuse pipe network of the reuse unit via the Shahe irrigation canal. The on / off status and output of the output branches are controlled by diversion valves, and the control unit controls the opening and closing of the diversion valves and their opening degree adjustment. The monitoring unit includes radar rainfall monitoring stations and online rain gauges installed at monitoring points for forecasting and / or monitoring rainfall, and detectors and / or sensors installed in the pipe networks of the infrastructure unit and / or reuse unit for monitoring water quality and / or flow and / or water pressure and / or water level. The signal output of the monitoring unit is connected to the signal input of the control unit.

[0010] The specific structure of this utility model includes:

[0011] To facilitate effective monitoring of water quality, water level, water pressure, and water quantity, and to enable the adoption of corresponding control and treatment measures, the preferred technical implementation is that the detector includes and / or the sensors include an online water quality monitor, a flow meter, and a water level / pressure sensor. The online water quality monitor is used to monitor water quality indicators, including key water quality indicators such as chemical oxygen demand, biochemical oxygen demand, total nitrogen, total phosphorus, and dissolved oxygen.

[0012] To facilitate the control of the opening and closing of the diversion valve and the adjustment of its opening degree, the preferred technical approach is that the control unit is connected to the diversion valve through an execution unit, and the execution unit is selected as a valve actuator. The valve actuator can be selected from, but is not limited to, a regulating electric actuator, a pneumatic actuator, a solenoid valve, etc., all without departing from the essence of this utility model.

[0013] To facilitate effective control of the stormwater pipe network output using diversion valves based on rainfall and stormwater pipe network monitoring indicators, the preferred technical implementation method is that the diversion valve includes a first diversion valve installed in the connection pipeline between the stormwater pipe network and the sewage treatment plant; a second diversion valve installed in the connection pipeline between the stormwater pipe network and the subsurface flow wetland; and a third diversion valve installed in the connection pipeline between the stormwater pipe network and the Shahe irrigation canal.

[0014] To facilitate the separation and interception of rainwater and sewage, initial rainwater retention, and regulation of pipe network flow, the preferred technical means is to install interception wells in the rainwater pipe network and / or its output branches.

[0015] When the gravity flow capacity of the Shahe irrigation canal is insufficient, in order to ensure smooth drainage, the preferred technical means is to include a drainage pumping station in the infrastructure unit, which can form a drainage channel together with the Shahe irrigation canal.

[0016] In the description of this utility model, "first", "second" and "third" are used only to describe the differences and should not be construed as implying importance.

[0017] This invention works as follows:

[0018] Surface rainwater runoff is collected through roof drains and road surface inlets before entering the stormwater drainage network. The core of the system operates on data from distributed monitoring units. The control unit compares measured values ​​with setpoints based on multiple factors, including rainfall intensity, rainwater quality, network load, wastewater treatment plant capacity, river water level, and reuse demand. Based on the comparison results, control commands are issued and three operating modes are selected:

[0019] 1. Light Rain Resource Utilization Mode: When rainfall intensity is ≤5 mm / hour, or the water level in the rainwater pipe network is <the set warning value, or the idle capacity of the sewage treatment plant is >2000 m³. 3 At this time, the first diversion valve is fully open, and more than 90% of the rainwater is introduced into the sewage treatment plant. The rainwater first enters the flow buffer tank of the sewage treatment plant to avoid instantaneous impact on the biological system, and then passes through pretreatment, biological treatment and advanced treatment in sequence before being stored in the reclaimed water storage area. The pump station starts and stops intelligently according to the municipal miscellaneous needs, and delivers the reclaimed water to the municipal miscellaneous reuse pipeline network of the reuse unit. The system monitors the load of the sewage treatment plant in real time. When the actual treatment volume reaches 90% of the design capacity, the opening of the first diversion valve is finely adjusted to 60° in advance, and the second diversion valve is opened to guide some rainwater to the subsurface flow wetland for temporary storage to prevent overflow in front of the plant.

[0020] 2. Moderate Rainfall Ecological Purification Mode: When the rainfall intensity is >5 mm / hour and the cumulative rainfall in the next hour is ≤25 mm, or when the rainwater has a moderate pollution load, the opening of the first diversion valve is adjusted to 15%, the second diversion valve is fully open, and the third diversion valve is closed. The rainwater flows mainly to the subsurface flow wetland for purification. The effluent from the subsurface flow wetland is evaluated in real time by an online water quality instrument. If COD≤50mg / L, NH3-N≤5mg / L, and TP≤0.5mg / L, the pumping station will pump the effluent to the farmland irrigation reuse network of the reuse unit for agricultural irrigation according to the water level of the catchment area and the needs of agricultural irrigation. If reuse is not required, it can be discharged into the landscape water body or used as ecological water replenishment for the wetland.

[0021] 3. Heavy rain drainage priority mode: When the rainfall intensity is greater than 25 mm / hour, or the cumulative rainfall in the next hour is greater than 25 mm, or the water level in the rainwater pipe network exceeds the set warning line, the first diversion valve is adjusted to the minimum opening or closed, the second diversion valve is quickly closed, and the third diversion valve is fully opened to open the drainage channel. If the gravity flow capacity of the Shahe irrigation canal is insufficient, the drainage pumping station will automatically start and complete the powerful pumping.

[0022] When the downstream river water level is below the warning level, the water is discharged directly through the drainage channel; if the river water level exceeds the warning level, a temporary storage mechanism is activated, that is, the idle capacity of the reclaimed water storage area and the reserved space in the wetland are used to discharge the water after the river water level recedes.

[0023] If the equipment malfunctions, the execution unit automatically switches to the emergency manual device to ensure that the drainage channels are unobstructed; after the rainstorm, the system automatically starts the flushing program of the subsurface flow wetland and rainwater pipe network to restore the purification capacity of the facilities.

[0024] The technological advancements achieved by this utility model are as follows:

[0025] 1. Significantly improved resource utilization efficiency: Through the coordinated treatment of rainwater and sewage and reuse in multiple scenarios in agriculture and municipality, the annual amount of rainwater collected and reused has increased by 25%. According to the applicant's test, the annual average amount of reused rainwater is 547,500 cubic meters. The replacement rate of municipal miscellaneous water with tap water has increased by 30%, and the amount of groundwater extracted for agricultural irrigation has decreased by 20%, effectively alleviating the water shortage pressure in North China.

[0026] 2. Outstanding pollution control effect: The horizontal subsurface flow wetland has a stable removal rate of COD, NH3-N and TP of slightly polluted rainwater of over 70%, 75% and 90%, respectively. After the effluent from the sewage treatment plant is deeply treated by the wetland, the pollutant indicators are further reduced, and the total amount of pollutants entering the river is reduced by more than 30 tons per year, including 15 tons of COD, 5 tons of NH3-N and 1 ton of TP. It effectively controls non-point source pollution in the watershed and improves the aquatic ecological environment.

[0027] 3. Enhanced flood control and drainage capacity: Through dynamic drainage strategies and coordinated facility operation, the peak water level of the city's main pipeline network during heavy rain is reduced by 15% to 20%, the area of ​​high-risk areas for urban flooding is reduced by 70%, and the drainage response time is shortened to within 20 minutes, significantly improving the resilience of urban flood control and drainage.

[0028] 4. Optimized operational efficiency: The entire system is precisely controlled on demand based on multi-source data, avoiding idling and ineffective energy consumption of sewage treatment plants, pumping stations, and aeration systems, and reducing overall operational energy consumption by more than 40%; the ring-city ecological ditch adopts an ecological design, which reduces maintenance costs by 60% and extends equipment service life by 5 to 8 years compared with traditional hardened ditches.

[0029] 5. Strong system adaptability and resilience: The distributed sensing network can accurately capture the spatial heterogeneity of rainfall, avoiding misjudgments in control caused by single-point monitoring; the multi-objective optimization decision module realizes dynamic adaptation under different rainfall conditions; the sewage treatment plant and wetland treatment methods are flexibly interconnected and can serve as backups for each other, improving the ability to cope with shock loads (such as rainstorms and sudden changes in water quality) and equipment failures, and the system's operational stability reaches over 98%. Attached Figure Description

[0030] The accompanying drawings of this utility model are as follows:

[0031] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0032] The reference numerals in the attached figures are as follows:

[0033] 1. Infrastructure Units: 1A. Stormwater Pipeline; 1B. Diversion Valve; 1B1. First Diversion Valve; 1B2. Second Diversion Valve; 1B3. Third Diversion Valve; 1C. Interception Well; 1D. Wastewater Treatment Plant; 1E. Subsurface Flow Wetland; 1F. Shahe Irrigation Canal; 1G. Reuse Pipeline; 2. Monitoring Units: 2A. Radar Rainfall Monitoring Station; 2B. Online Rain Gauge; 2C. Online Water Quality Monitor; 2D. Flow Meter; 2E. Water Level / Pressure Sensor; 3. Control Unit; 4. Execution Unit; 5. Reuse Units: 5A. Municipal Miscellaneous Reuse Pipeline; 5B. Farmland Irrigation Reuse Pipeline; 5C. Ecological Water Replenishment Reuse Pipeline. Detailed Implementation

[0034] The present invention will be further described below with reference to the embodiments, but this is not intended to limit the present invention. The scope of protection of the present invention shall be determined by the contents of the claims. Any equivalent technical means substitution made in accordance with the specification shall not depart from the scope of protection of the present invention.

[0035] 1. Project Background

[0036] The following is a specific application case of a county-level town in North China. The town has a total area of ​​120 square kilometers, a built-up area of ​​30 square kilometers, a resident population of 150,000, an average annual rainfall of 550 mm, and 80% of the rainfall occurs from June to September. The existing sewage treatment plant has a designed capacity of 30,000 cubic meters per day, a daily treatment capacity of 23,000 cubic meters per day, and an idle capacity of 7,000 cubic meters per day. There are 5 square kilometers of areas prone to waterlogging, 80 square kilometers of agricultural land, and an average annual irrigation water demand of 15 million cubic meters.

[0037] 2. System Structure

[0038] The urban water resource multi-scenario collaborative utilization and flood control system includes infrastructure unit 1, monitoring unit 2, control unit 3, execution unit 4, and reuse unit 5. Rainwater collected by the infrastructure unit is discharged through three outlets via rainwater pipe network 1A. The first outlet is treated by sewage treatment plant 1D and then connected to the municipal miscellaneous reuse pipe network 5A of reuse unit 5. The second outlet is treated by subsurface flow wetland 1E and then connected to the farmland irrigation reuse pipe network 5B of reuse unit 5. The third outlet is connected to the ecological replenishment water system of reuse unit 5 via Shahe irrigation canal 1F. Pipeline 5C is used; the on / off status and output of the output branch are controlled by the diversion valve 1B, and the control unit 3 controls the opening and closing of the diversion valve 1B and the opening degree adjustment; the monitoring unit includes a radar rainfall monitoring station 2A and an online rain gauge 2B set at the monitoring point for forecasting and / or monitoring rainfall, and detectors and / or sensors set in the pipeline of the basic setting unit 1 and / or reuse unit for monitoring water quality and / or flow and / or water pressure and / or water level, and the signal output of the monitoring unit 2 is connected to the signal input terminal of the control unit 3.

[0039] The detector includes and / or sensors including an online water quality monitor 2C, a flow meter 2D, and a water level / pressure sensor 2E. The online water quality monitor 2C is used to monitor water quality indicators, including key water quality indicators such as chemical oxygen demand, biochemical oxygen demand, total nitrogen, total phosphorus, and dissolved oxygen.

[0040] The control unit 3 is connected to the diversion valve 1B via the execution unit 4, which is a valve actuator. The valve actuator can be, but is not limited to, a regulating electric actuator, a pneumatic actuator, a solenoid valve, etc., all of which do not depart from the essence of this utility model.

[0041] Diversion valve 1B includes a first diversion valve 1B1 installed in the connecting pipeline between rainwater pipe network 1A and sewage treatment plant 1D; a second diversion valve 1B2 installed in the connecting pipeline between rainwater pipe network 1A and subsurface flow wetland 1E; and a third diversion valve 1B3 installed in the connecting pipeline between rainwater pipe network 1A and Shahe irrigation canal 1F.

[0042] Interception wells 1C are provided in rainwater pipe network 1A and / or its output branches.

[0043] Infrastructure Unit 1 also includes a drainage pumping station that can form a drainage channel together with Shahe Irrigation Canal 1F.

[0044] 3. Structural parameters

[0045] Infrastructure Unit 1: The main pipe of the stormwater pipe network 1A uses PE pipes with a diameter of 1000 mm, and the branch pipes use PE pipes with a diameter of 400 mm. The inspection wells are spaced 60 meters apart. The sewage treatment plant 1D has an A2 / O biological treatment tank with a volume of 10,000 cubic meters, a flow buffer tank with a volume of 5,000 cubic meters, and a reclaimed water storage area with two compartments, each with a capacity of 5,000 cubic meters. The subsurface flow wetland 1E covers an area of ​​8,000 square meters, with three sections of substrate thickness of 800 mm, 700 mm, and 600 mm. The vegetation is configured as follows: 15 reeds / square meter, 12 cattails / square meter, and 20 irises / square meter. The drainage pumping station has a flow rate of 5,000 cubic meters / hour, and the drainage channel is the Shahe Irrigation Canal 1F with a cross-sectional size of 6 meters × 4 meters. The reuse unit 5 is equipped with 3 agricultural water inlets and 20 kilometers of municipal miscellaneous reuse pipe network 5A.

[0046] Monitoring Unit 2 includes: 1) Meteorological and hydrological monitoring: Three radar rainfall monitoring stations are deployed in the east, west, and north of the urban area, and 10 online rain gauges (2B) are evenly distributed throughout the built-up area; 2) Water quality and quantity monitoring: Seven sets of online water quality monitoring instruments (2C) and seven sets of flow meters (2D) are installed before the intercepting well (1C), at the inlet and outlet of the subsurface flow wetland (1E), at the river outlet, at the inlet of the sewage treatment plant (1D), at the outlet of the biochemical pool, at the outlet of the deep treatment plant, and at the reclaimed water storage area; the flow meters (2D) are ultrasonic flow meters; 3) Water level and pressure monitoring: Seventeen sets of water level / pressure sensors (2E) are deployed at 10 key nodes of the pipeline network, at 2 collection wells of the sewage treatment plant (1D), at 3 collection areas of the subsurface flow wetland (1E), and at 2 river channels.

[0047] Control Unit 3: Configured with 2 sets of industrial-grade servers (1 main and 1 backup), equipped with WinCC configuration software; the data fusion module is based on Python Kalman filtering, with an update frequency of 1 minute / time; the SWMM rainfall prediction model error is ≤10%; the genetic algorithm decision module has a solution time of ≤30 seconds; and the safety linkage module has a response time of ≤5 seconds.

[0048] Execution Unit 4: The valve actuator uses a Schneider frequency converter and an Omron relay.

[0049] The remaining structure is as described above.

[0050] Running effect

[0051] 1. Light rain conditions, i.e., rainfall of 3 mm / hour and COD = 85 mg / L: the average daily reuse of rainwater is 1500 cubic meters, and the municipal miscellaneous tap water replacement rate is increased by 30%.

[0052] 2. Under moderate rain conditions, i.e., rainfall of 15 mm / hour and COD = 150 mg / L: the removal rates of COD, NH3-N and TP by the subsurface flow wetland 1E reached 75%, 80% and 92% respectively, with an average daily farmland irrigation water supply of 5000 cubic meters and a 20% reduction in groundwater extraction.

[0053] 3. Heavy rain conditions, i.e., rainfall of 30 mm / hour, with the pipeline network exceeding the warning level: the peak water level of the pipeline network drops by 18% within 30 minutes, the high-risk area for urban flooding shrinks to 1.5 square kilometers, and the drainage response time is 18 minutes.

[0054] Comprehensive benefits: After the wastewater effluent is treated by the subsurface flow wetland 1E, the indicators meet the standards. The average annual water supply for farmland irrigation is 1.2 million cubic meters, the ecological water replenishment is 800,000 cubic meters, and the water resource reuse rate is increased by 25%. The average annual reduction of pollutants entering the river is more than 30 tons, the overall energy consumption of the system is reduced by 40%, and the facility maintenance cost is reduced by 60%.

Claims

1. A multi-scenario collaborative utilization and flood control system for urban water resources, characterized in that... The system includes an infrastructure unit (1), a monitoring unit (2), a control unit (3), an execution unit (4), and a reuse unit (5). The rainwater collected by the infrastructure unit is discharged through three outlets via a rainwater pipe network (1A). The first outlet is treated at a wastewater treatment plant (1D) and then connected to the municipal miscellaneous reuse pipe network (5A) of the reuse unit (5). The second outlet is treated at a subsurface flow wetland (1E) and then connected to the farmland irrigation reuse pipe network (5B) of the reuse unit (5). The third outlet is connected to the ecological water replenishment reuse pipe network (5A) of the reuse unit (5) via the Shahe irrigation canal (1F). C); The on / off state and output of the output branch are controlled by the diversion valve (1B), and the control unit (3) controls the opening and closing of the diversion valve (1B) and the opening degree adjustment; The monitoring unit includes a radar rainfall monitoring station (2A) and an online rain gauge (2B) set at the monitoring point for forecasting and / or monitoring rainfall, and a detector and / or sensor set in the pipeline network of the basic setting unit (1) and / or reuse unit for monitoring water quality and / or flow and / or water pressure and / or water level. The signal output of the monitoring unit (2) is connected to the signal input terminal of the control unit (3).

2. The urban water resources multi-scenario collaborative utilization and flood control regulation system according to claim 1, characterized in that... The detection instruments include and / or sensors including online water quality monitors (2C), flow meters (2D), and water level / pressure sensors (2E).

3. The urban water resources multi-scenario collaborative utilization and flood control regulation system according to claim 1, characterized in that... The control unit (3) is connected to the diversion valve (1B) through the execution unit (4), and the execution unit (4) is a valve actuator.

4. The urban water resources multi-scenario collaborative utilization and flood control regulation system according to claim 1, characterized in that... The diversion valve (1B) includes a first diversion valve (1B1) installed in the connection pipeline between the stormwater pipe network (1A) and the sewage treatment plant (1D); a second diversion valve (1B2) installed in the connection pipeline between the stormwater pipe network (1A) and the subsurface flow wetland (1E); and a third diversion valve (1B3) installed in the connection pipeline between the stormwater pipe network (1A) and the Shahe irrigation canal (1F).

5. The urban water resources multi-scenario collaborative utilization and flood control regulation system according to claim 1, characterized in that... Interception wells (1C) are provided in the stormwater pipe network (1A) and / or its outgoing branches.

6. The urban water resources multi-scenario collaborative utilization and flood control regulation system according to claim 1, characterized in that... The infrastructure unit also includes a drainage pumping station that can form a drainage channel together with the Shahe Irrigation Canal (1F).

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