Intelligent self-cleaning rainwater recovery and flood control integrated system

Abstract

The invention discloses an intelligent self-cleaning rainwater recovery and flood control integrated system, which is characterized in that an intelligent monitoring module of the system acquires rainfall, liquid levels of a rainwater collection well and a water storage tank, sludge thickness of a filter screen, turbidity of filtered rainwater and suspended matter content data in real time through various sensors, and transmits the data to a central control module; the self-cleaning filtering module is arranged in the rainwater collecting well and performs self-cleaning and silt discharging on a filter screen; the intelligent shunting module is connected with a rainwater recycling pipeline and an emergency drainage pipeline through a three-way flow regulating valve; the water storage and purification module is used for purifying rainwater entering a water storage tank through a multi-stage purification unit and discharging the rainwater into a rainwater recycling bin; the flood control emergency module starts an emergency pressure pump through a pipe network pressure sensor to increase drainage pressure; the central control module receives monitoring data of the intelligent monitoring module and controls operation of each module based on a preset algorithm. The system realizes the functions of rainwater collection, filtration, diversion, flood prevention, purification and reuse, and gives consideration to both water resource recovery and urban inland inundation prevention and control.

Description

Technical Field

[0001] This invention relates to the field of municipal engineering construction technology, and in particular to an intelligent self-cleaning rainwater harvesting and flood control integrated system. Background Technology

[0002] With the acceleration of urbanization, urban flooding, water shortages, and stormwater drainage network blockages are becoming increasingly prominent problems. Traditional stormwater drainage networks only have a drainage function, with rainwater directly discharged into natural water bodies, resulting in water waste. Furthermore, during heavy rains, the network's insufficient capacity can easily lead to flooding. Existing rainwater harvesting systems mostly use fixed filters, which are easily clogged by leaves, silt, and other impurities, requiring frequent manual cleaning, resulting in high maintenance costs and low efficiency. At the same time, rainwater harvesting and flood control systems are independent of each other, unable to intelligently switch operating modes based on rainfall, making it difficult to balance flood control and harvesting efficiency during heavy rains. Moreover, the purification process for harvested rainwater is complex, lacks real-time water quality monitoring, and the safety of reclaimed water reuse is questionable.

[0003] Therefore, the municipal engineering field urgently needs an integrated solution that can combine flood control, recycling, and self-cleaning functions, and is efficient in operation and convenient in maintenance, in order to solve the above-mentioned technical pain points. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide an intelligent self-cleaning rainwater harvesting and flood control integrated system. This system overcomes the defects of traditional rainwater harvesting, realizes the functions of rainwater collection, filtration, diversion, flood control, purification and reuse, takes into account water resource recovery and urban waterlogging prevention, reduces the frequency of manual maintenance, lowers operation and maintenance costs, ensures that the quality of reused water meets the standards, and expands the scenarios for rainwater reuse.

[0005] To solve the above-mentioned technical problems, the present invention provides an intelligent self-cleaning rainwater harvesting and flood control integrated system, which includes an intelligent monitoring module, a self-cleaning filtration module, an intelligent diversion module, a water storage and purification module, a flood control emergency module, and a central control module. The intelligent monitoring module includes a rain sensor installed in the green belt of municipal roads or on the top of street light poles, a liquid level sensor deployed in rainwater collection wells and water storage tanks, a sludge thickness sensor installed on the filter screen surface of the self-cleaning filter module, and a water quality sensor deployed at the outlet of the water storage tank. It collects data on rainfall, liquid level in rainwater collection wells and water storage tanks, sludge thickness on the filter screen surface, turbidity and suspended solids content of filtered rainwater in real time, and transmits the data to the central control module. The self-cleaning filter module is located inside the rainwater collection well and includes a rotating stainless steel filter screen driven by a motor, a high-pressure spray assembly arranged in a ring along the inner side of the filter screen, and a spiral sludge discharge pipe located at the bottom of the filter screen. The intelligent diversion module includes a three-way flow regulating valve installed at the outlet of the self-cleaning filter module, a rainwater harvesting pipeline connected to the water storage and purification module, and an emergency drainage pipeline connected to the municipal main drainage network. In light rain mode, the three-way flow regulating valve switches to the rainwater harvesting pipeline, and all filtered rainwater is introduced into the water storage and purification module. In moderate rain mode, the three-way flow regulating valve switches to both the rainwater harvesting pipeline and the emergency drainage pipeline, with 70% of the rainwater entering the rainwater harvesting pipeline and 30% being diverted through the emergency drainage pipeline. In heavy rain mode, the three-way flow regulating valve switches to the emergency drainage pipeline, stopping rainwater harvesting. In water tank level mode, when the water tank level is ≥90%, the three-way flow regulating valve switches to the emergency drainage pipeline to prevent the water tank from overflowing. The water storage and purification module includes an underground water storage tank with built-in multi-stage purification units and a rainwater reuse chamber. The multi-stage purification units are, in sequence, a quartz sand filter layer, an activated carbon adsorption layer, and a UV disinfection device. The input end of the underground water storage tank is connected to a rainwater recycling pipeline, and the output end is connected to the rainwater reuse chamber. The rainwater at the output end of the underground water storage tank is monitored in real time by a water quality sensor for turbidity and suspended solids content. If the rainwater meets the standards, it is stored in the reuse chamber. If it does not meet the standards, it is reintroduced into the water storage tank for purification through a circulation pipeline until it meets the standards. The flood control emergency module includes an emergency booster pump installed in the emergency drainage pipeline and a pipeline pressure sensor deployed at the interface of the municipal main drainage pipeline. If the pipeline pressure sensor detects that the municipal main drainage pipeline is blocked, the emergency booster pump will start to increase the drainage pressure, accelerate rainwater discharge, and prevent rainwater from accumulating in the rainwater collection well and flowing back into the pipeline. The central control module includes a PLC controller, a wireless communication module, and a human-machine interface terminal. It receives monitoring data from the intelligent monitoring module, controls the operation of each module based on a preset algorithm, and supports remote monitoring, parameter adjustment, and fault alarms.

[0006] Furthermore, the rotary stainless steel filter screen has a pore size of 5-10 mm and a conical structure, and the spiral drainage pipe has an inclination angle of 30°.

[0007] Furthermore, the light rain mode is defined as rainfall < 5 mm / h, the moderate rain mode as 5 mm / h ≤ rainfall ≤ 20 mm / h, and the heavy rain mode as rainfall > 20 mm / h.

[0008] Furthermore, the preset algorithms of the central control module include a rainfall algorithm, a rainwater diversion ratio mapping algorithm, a filter bottom sludge thickness algorithm, and a filter self-cleaning trigger algorithm. The intelligent self-cleaning rainwater harvesting and flood control integrated system of this invention adopts the above-mentioned technical solution. Specifically, the system includes an intelligent monitoring module, a self-cleaning filtration module, an intelligent diversion module, a water storage and purification module, a flood control emergency module, and a central control module. The intelligent monitoring module collects real-time data on rainfall, rainwater collection well and storage tank levels, sludge thickness on the filter surface, turbidity of filtered rainwater, and suspended solids content through various sensors, and transmits the data to the central control module. The self-cleaning filtration module is located in the rainwater collection well and performs self-cleaning and sludge removal on the filter. The intelligent diversion module connects the rainwater harvesting pipeline and the emergency drainage pipeline through a three-way flow regulating valve. The water storage and purification module purifies the rainwater entering the storage tank through multi-stage purification units and discharges it into the rainwater reuse bin. The flood control emergency module activates an emergency booster pump to increase drainage pressure through a pipeline pressure sensor. The central control module receives monitoring data from the intelligent monitoring module, controls the operation of each module based on a preset algorithm, and supports remote monitoring, parameter adjustment, and fault alarms. This system overcomes the shortcomings of traditional rainwater harvesting, realizing the functions of rainwater collection, filtration, diversion, flood control, purification and reuse. It takes into account both water resource recovery and urban waterlogging prevention, reduces the frequency of manual maintenance, lowers operation and maintenance costs, ensures that the quality of reused water meets standards, and expands the scenarios for rainwater reuse. Attached Figure Description

[0009] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the intelligent self-cleaning rainwater harvesting and flood control integrated system of the present invention. Detailed Implementation

[0010] Implementation, for example Figure 1 As shown, the intelligent self-cleaning rainwater harvesting and flood control integrated system of the present invention includes an intelligent monitoring module, a self-cleaning filtration module, an intelligent diversion module, a water storage and purification module, a flood control emergency module, and a central control module; The intelligent monitoring module includes a rain sensor installed in the green belt of municipal roads or on the top of street light poles, a liquid level sensor deployed in rainwater collection wells and water storage tanks, a sludge thickness sensor installed on the filter screen surface of the self-cleaning filter module, and a water quality sensor deployed at the outlet of the water storage tank. It collects data on rainfall, liquid level in rainwater collection wells and water storage tanks, sludge thickness on the filter screen surface, turbidity and suspended solids content of filtered rainwater in real time, and transmits the data to the central control module. The self-cleaning filter module is located inside the rainwater collection well and includes a rotating stainless steel filter screen driven by a motor, a high-pressure spray assembly arranged in a ring along the inner side of the filter screen, and a spiral sludge discharge pipe located at the bottom of the filter screen. When the sludge thickness sensor detects that the sludge thickness on the filter screen surface exceeds the preset threshold (5-8mm), the central control module triggers the self-cleaning program: ① The motor drives the rotary stainless steel filter screen to rotate at a speed of 10-15r / min; ② The high-pressure spray assembly connected to the municipal low-pressure water pipe is activated, spraying water with a pressure of 0.3-0.5MPa to rinse the filter screen surface; ③ The sludge that has been rinsed off is automatically discharged into the municipal sewage network through the spiral sludge discharge pipe to avoid secondary pollution. The intelligent diversion module includes a three-way flow regulating valve installed at the outlet of the self-cleaning filter module, a rainwater recovery pipeline connected to the water storage and purification module, and an emergency drainage pipeline connected to the municipal main drainage network. In light rain mode, the three-way flow regulating valve switches to the rainwater recovery pipeline, and all filtered rainwater is introduced into the water storage and purification module. In moderate rain mode, the three-way flow regulating valve switches to both the rainwater recovery pipeline and the emergency drainage pipeline, with 70% of the rainwater entering the rainwater recovery pipeline and 30% being diverted through the emergency drainage pipeline to balance recovery efficiency and network pressure. In heavy rain mode, the three-way flow regulating valve switches to the emergency drainage pipeline, stopping rainwater recovery and focusing on drainage to prevent flooding. In water tank level mode, when the water tank level is ≥90%, the three-way flow regulating valve switches to the emergency drainage pipeline to prevent the water tank from overflowing. The water storage and purification module includes an underground water storage tank with built-in multi-stage purification units and a rainwater reuse chamber. The multi-stage purification units are, in sequence, a quartz sand filter layer, an activated carbon adsorption layer, and a UV disinfection device. The input end of the underground water storage tank is connected to a rainwater recycling pipeline, and the output end is connected to the rainwater reuse chamber. The rainwater at the output end of the underground water storage tank is monitored in real time by a water quality sensor for turbidity and suspended solids content. If the rainwater meets the standards, it is stored in the reuse chamber. If it does not meet the standards, it is reintroduced into the water storage tank for purification through a circulation pipeline until it meets the standards. The flood control emergency module includes an emergency booster pump installed in the emergency drainage pipeline and a pipeline pressure sensor deployed at the interface of the municipal main drainage pipeline. If the pipeline pressure sensor detects that the municipal main drainage pipeline is blocked, the emergency booster pump will start to increase the drainage pressure, accelerate rainwater discharge, and prevent rainwater from accumulating in the rainwater collection well and flowing back into the pipeline. The central control module includes a PLC controller, a wireless communication module, and a human-machine interface terminal. It receives monitoring data from the intelligent monitoring module, controls the operation of each module based on a preset algorithm, and supports remote monitoring, parameter adjustment, and fault alarms.

[0011] Preferably, the rotary stainless steel filter screen has a pore size of 5-10 mm and a conical structure, and the spiral drainage pipe has an inclination angle of 30°.

[0012] Preferably, the light rain mode is characterized by rainfall of <5mm / h, the moderate rain mode is characterized by rainfall of 5mm / h ≤ rainfall of ≤20mm / h, and the heavy rain mode is characterized by rainfall of >20mm / h.

[0013] Preferably, the preset algorithms of the central control module include a rainfall algorithm, a rainwater diversion ratio mapping algorithm, a filter bottom sludge thickness algorithm, and a filter self-cleaning trigger algorithm.

[0014] Installation and deployment of this system: Rainwater collection wells: One well is installed every 50-80m on both sides of municipal roads. The top of the rainwater collection well is equipped with a grating cover (20mm aperture to intercept large debris), and a self-cleaning filter module and a liquid level sensor are embedded inside. Water storage and purification module: buried under the road green belt, with a maintenance port reserved on the top of the water storage tank, and multi-stage purification units integrated inside the water storage tank, saving space; Pipeline connections: Rainwater harvesting pipelines are made of PE material with a diameter of DN150-200, and emergency drainage pipelines have a diameter of DN300-400, which can be seamlessly connected to the municipal main drainage network; Monitoring module installation: Rainfall sensors are fixed to the top of street light poles (height ≥ 5m), and water quality sensors are installed at the outlet of the purification unit and the end of the reuse pipeline.

[0015] Example of operation process Light rain scenario (rainfall 3mm / h): The rain sensor transmits data to the central control module, triggering the light rain mode. Rainwater enters the rainwater collection well through the grating cover, and the self-cleaning filter module is activated (the filter screen is stationary, filtering only). The three-way flow regulating valve switches to the rainwater recycling pipeline. After being filtered by quartz sand and activated carbon and disinfected by UV, the rainwater is stored in the reuse bin for subsequent greening irrigation. Heavy rain scenario (rainfall 25mm / h): The rain sensor triggered the rainstorm mode, and the three-way flow regulating valve switched to the emergency drainage pipeline. When the pipeline pressure sensor detects an increase in pressure in the main pipeline, the central control module starts the emergency booster pump to accelerate drainage. The self-cleaning filter module pauses rainwater filtration to keep the filter screen clean, and automatically starts a full cleaning after the rainstorm ends. Self-cleaning trigger scenarios: When the sludge thickness sensor detects that the sludge thickness on the filter screen surface reaches 6mm, the central control module starts the self-cleaning program: filter screen rotation (12r / min) + high-pressure spray (0.4MPa), the sludge is discharged into the sewage network through the spiral sludge discharge pipe, the cleaning time lasts for 3 minutes, and normal rainwater filtration is restored after cleaning.

[0016] Parameter adjustability The core parameters of this system (such as rainfall threshold, sludge thickness threshold, diversion ratio, purification time, etc.) can be flexibly adjusted through the human-machine interaction terminal of the central control module located in the municipal operation and maintenance center to adapt to the municipal needs of different cities and different road sections.

[0017] Compared with existing technologies, this system has the following significant advantages: Integrated Functions: It integrates flood control and drainage, rainwater harvesting, and purification and reuse functions, solving the drawbacks of multiple systems operating independently in municipal engineering, improving the utilization rate of urban water resources (according to actual measurements, the rainwater harvesting and reuse rate of a single road section can reach more than 60%), while reducing the risk of urban flooding; Self-cleaning and maintenance-free: The self-cleaning design of the rotary filter and high-pressure spray can automatically remove sludge, extending the manual maintenance cycle to more than 6 months and reducing operation and maintenance costs by 70%; Intelligent Adaptive: Based on real-time data such as rainfall, water quality, and pipeline pressure, the system dynamically switches operating modes to adapt to different weather scenarios, avoiding resource waste and the risk of urban flooding; Water quality is controllable: With the dual guarantee of multi-stage purification and real-time monitoring, the quality of reclaimed water meets the standard of "Water Quality for Urban Miscellaneous Water Use of Reclaimed Urban Wastewater" (GB / T 18920-2020) and can be safely used in various municipal scenarios (such as greening irrigation, road washing, fire water replenishment, etc.). Highly adaptable to installation: It adopts an underground water storage tank design, which occupies a small area and can be adapted to the renovation and upgrading of existing municipal roads and green belts. The construction period is short (installation period for a single road section ≤ 15 days) and it has high compatibility.

Claims

1. An intelligent self-cleaning rainwater harvesting and flood control integrated system, characterized in that: It includes an intelligent monitoring module, a self-cleaning filtration module, an intelligent diversion module, a water storage and purification module, a flood control emergency module, and a central control module; The intelligent monitoring module includes a rain sensor installed in the green belt of municipal roads or on the top of street light poles, a liquid level sensor deployed in rainwater collection wells and water storage tanks, a sludge thickness sensor installed on the filter screen surface of the self-cleaning filter module, and a water quality sensor deployed at the outlet of the water storage tank. It collects data on rainfall, liquid level in rainwater collection wells and water storage tanks, sludge thickness on the filter screen surface, turbidity and suspended solids content of filtered rainwater in real time, and transmits the data to the central control module. The self-cleaning filter module is located inside the rainwater collection well and includes a rotating stainless steel filter screen driven by a motor, a high-pressure spray assembly arranged in a ring along the inner side of the filter screen, and a spiral sludge discharge pipe located at the bottom of the filter screen. The intelligent diversion module includes a three-way flow regulating valve installed at the outlet of the self-cleaning filter module, a rainwater harvesting pipeline connected to the water storage and purification module, and an emergency drainage pipeline connected to the municipal main drainage network. In light rain mode, the three-way flow regulating valve switches to the rainwater harvesting pipeline, and all filtered rainwater is introduced into the water storage and purification module. In moderate rain mode, the three-way flow regulating valve switches to both the rainwater harvesting pipeline and the emergency drainage pipeline, with 70% of the rainwater entering the rainwater harvesting pipeline and 30% being diverted through the emergency drainage pipeline. In heavy rain mode, the three-way flow regulating valve switches to the emergency drainage pipeline, stopping rainwater harvesting. In water tank level mode, when the water tank level is ≥90%, the three-way flow regulating valve switches to the emergency drainage pipeline to prevent the water tank from overflowing. The water storage and purification module includes an underground water storage tank with built-in multi-stage purification units and a rainwater reuse chamber. The multi-stage purification units are, in sequence, a quartz sand filter layer, an activated carbon adsorption layer, and a UV disinfection device. The input end of the underground water storage tank is connected to a rainwater recycling pipeline, and the output end is connected to the rainwater reuse chamber. The rainwater output from the underground water storage tank is monitored in real time by a water quality sensor for turbidity and suspended solids content. If the rainwater meets the standards, it is stored in the reuse chamber. If it does not meet the standards, it is reintroduced into the water storage tank for purification through a circulation pipeline until it meets the standards. The flood control emergency module includes an emergency booster pump installed in the emergency drainage pipeline and a pipeline pressure sensor deployed at the interface of the municipal main drainage pipeline. If the pipeline pressure sensor detects that the municipal main drainage pipeline is blocked, the emergency booster pump will start to increase the drainage pressure, accelerate rainwater discharge, and prevent rainwater from accumulating in the rainwater collection well and flowing back into the pipeline. The central control module includes a PLC controller, a wireless communication module, and a human-machine interface terminal. It receives monitoring data from the intelligent monitoring module, controls the operation of each module based on a preset algorithm, and supports remote monitoring, parameter adjustment, and fault alarms.

2. The intelligent self-cleaning rainwater harvesting and flood control integrated system according to claim 1, characterized in that: The rotary stainless steel filter screen has a pore size of 5-10 mm and a conical structure, and the spiral drainage pipe has an inclination angle of 30°.

3. The intelligent self-cleaning rainwater harvesting and flood control integrated system according to claim 1, characterized in that: The light rain mode is defined as rainfall < 5 mm / h, the moderate rain mode as 5 mm / h ≤ rainfall ≤ 20 mm / h, and the heavy rain mode as rainfall > 20 mm / h.

4. The intelligent self-cleaning rainwater harvesting and flood control integrated system according to claim 1, characterized in that: The preset algorithms of the central control module include a rainfall algorithm, a rainwater diversion ratio mapping algorithm, a filter bottom sludge thickness algorithm, and a filter self-cleaning trigger algorithm.

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