Rainwater recovery system for intelligent construction site

Abstract

The rainwater recovery system comprises a rainwater collection pipeline, a sedimentation tank, a water pump, a primary filter, a rainwater diversion pipeline, a first storage tank, a second storage tank and an intelligent monitoring module, and is characterized in that rainwater is collected by the collection pipeline and uniformly flows into the sedimentation tank, and after the rainwater is treated by the sedimentation tank, the water pump is pressurized to work; the rainwater subjected to primary filtration is connected to a first flow dividing branch and a second flow dividing branch through an outlet pipeline through the primary filter, and the first flow dividing branch is connected with a first storage tank. By achieving classified utilization of the rainwater, the high cost caused by a single high-standard purification process can be reduced, and the rainwater can be recycled; and water resources can be reasonably distributed according to different purposes, and the flexibility and economy of rainwater utilization are improved.

Description

Technical Field

[0001] The invention relates to a rainwater recycling system for a smart construction site and belongs to the field of rainwater recycling and reuse. Background Art

[0002] Rainwater recycling technology at construction sites is gaining more and more attention in current construction. Its main purpose is to save water resources and protect the environment. At the construction site, by collecting rainwater and treating it to meet the design standards, the system can be used for various purposes such as structural maintenance water and foundation pit support water, thus accumulating experience for green construction.

[0003] In the prior art, the filtration and purification of rainwater is already very advanced. For example, patent CN216808440U discloses a rainwater infiltration and storage system with good purification and filtration effect for sponge city construction, including a rainwater collection pool and a second water pipe. The rainwater collection pool includes a gravel layer, a partition and a water-permeable hole. A water pipe is arranged at the upper end of the inner cavity of the rainwater collection pool, and the water pipe is connected to the external city sewer and the external building rainwater collection pipe. The middle end of the bottom of the rainwater collection pool is connected to the first water pipe, and the other end of the first water pipe is connected to the rainwater filtration pool. The rainwater filtration pool includes an equalizing plate, a coarse sand layer, a fine sand layer, an activated carbon granule layer and a barrier cover. Through the action of the gravel layer, the equalizing plate, the coarse sand layer, the fine sand layer, the activated carbon granule layer, the microporous filtration membrane layer, the ultraviolet sterilization lamp, the quartz glass cover, the ozone generator and the ventilation plate.

[0004] However, most of the filter layers are consumables and need to be replaced frequently. In many cases, the demand for rainwater purification is not too high. For example, water used to wash construction site vehicles and roads does not require very good water quality. However, for waterscape greening, toilet flushing, air conditioning cooling water replenishment, etc., recycled rainwater with better water quality is required. Summary of the invention

[0005] The purpose of the present invention is to provide a rainwater recycling system for a smart construction site, which has automatic intelligent control of the entire process, ensures the water quality of the rainwater after purification, realizes the graded utilization of rainwater, solves the problem that the existing rainwater recycling system cannot be intelligently controlled, and saves the number of times the filter is replaced.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a rainwater recycling system for a smart construction site, comprising a rainwater collection pipeline, a sedimentation tank, a primary filter, a rainwater diversion device, a first storage tank, a second storage tank and an intelligent monitoring module, characterized in that: rainwater is collected through a collection pipeline and uniformly flows into the sedimentation tank, after being processed in the sedimentation tank, the rainwater passes through the primary filter, and the rainwater after primary filtration is connected to a first diversion branch and a second diversion branch through an outlet pipeline, and the first diversion branch is connected to the first storage tank; it also includes a secondary filter, the second diversion branch is connected to the secondary filter, and the outlet of the secondary filter is connected to the second storage tank; a first valve is provided at the inlet of the first diversion branch, a second valve is provided at the inlet of the second diversion branch, a bypass pipeline is provided at the outlet position of the first diversion branch and the secondary filter, and a third valve is provided on the bypass pipeline; the intelligent monitoring module is connected with the first valve, the second valve and the third valve, and the intelligent monitoring module controls the opening and closing of the first valve, the second valve and the third valve according to the control mode, so as to control the circulation of rainwater in the first diversion branch and the second diversion branch; the control mode includes automatic control mode, primary purification mode and deep purification mode.

[0007] Preferably, a first water level detection device and a first water quality sensor are provided in the first storage tank, and a second water level detection device and a second water quality sensor are provided in the second storage tank; water quality data is obtained through the first water quality sensor and the second water quality sensor, and the water quality data is provided with a first water quality grade value and a second water quality grade value, wherein the second water quality grade value is higher than the first water quality grade value; wherein water whose water quality data is the first water quality grade value has not passed through the secondary filter.

[0008] Preferably, the specific working steps of the automatic control mode are: S1: keep the third valve closed, open the first valve, close the second valve, the water pump starts working, and the purified rainwater flows into the first storage tank; S2: when the water level of the first storage tank reaches the set critical value, close the first valve, open the second valve, and the purified rainwater flows into the second storage tank; S3: when the water levels of the first storage tank and the second storage tank both reach their respective set critical values, stop the water pump and close the first valve, the second valve and the third valve.

[0009] Preferably, the specific working steps of the primary purification mode are: S1: keep the third valve open, open the first valve, close the second valve, the water pump starts working, and the purified rainwater flows into the first storage tank; S2: when the water level of the first storage tank reaches the set critical value, stop the water pump.

[0010] Preferably, the specific working steps of the deep purification mode are: S1: keep the third valve open, open the second valve, close the first valve, the water pump starts working, and the purified rainwater flows into the first storage tank; S2: when the water level of the second storage tank reaches the set critical value, stop the water pump.

[0011] Preferably, the primary filter comprises an equalizing plate, a pebble layer, a sand layer, and a fine sand layer, and the secondary filter comprises an activated carbon layer, a microporous membrane layer, and an ultraviolet sterilization lamp.

[0012] Preferably, a discarded flow filter is also provided at the inlet position of the sedimentation tank, and the discarded flow filter has a built-in discarded flow filter screen, and the mesh size of the discarded flow filter screen is 60-70 meshes.

[0013] Preferably, the information collected by the intelligent monitoring module is transmitted to the central control system via the wireless communication module. The central control system includes a user interaction interface, and the user can monitor the water quality information through the display; the user can select the automatic control mode, the primary purification mode and the deep purification mode according to the water use situation.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] The classification and purification of rainwater is an efficient and economical water resource management strategy. The core of this strategy is to implement different levels of purification according to the purpose and water quality requirements of rainwater. According to the specific purpose of rainwater, such as green irrigation, industrial water or domestic miscellaneous water, corresponding secondary or multi-stage purification technologies, such as activated carbon adsorption, membrane filtration or disinfection, are used to further improve the water quality. For rainwater that does not require deep purification, it is stored and used after primary purification.

[0016] By realizing the hierarchical utilization of rainwater, we can not only reduce the high cost of a single high-standard purification process, but also reasonably allocate water resources according to different purposes, and improve the flexibility and economy of rainwater utilization. For example, rainwater after primary purification can be used for non-drinking areas such as flushing and cooling, while rainwater after deep treatment can be used to irrigate sensitive crops or as a supplement to domestic water. This hierarchical treatment and utilization method not only optimizes the allocation of rainwater resources, but also promotes sustainable water resources management, providing an effective solution to the problem of water shortage in the process of urbanization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 The system diagram of the present invention is

[0018] Attached Figure 2 This is a water flow diagram of the automatic control mode of the present invention.

[0019] Attached Figure 3 This is a water flow diagram for the primary purification mode of the present invention.

[0020] Attached Figure 4 This is a water flow diagram for the deep purification mode of the present invention.

[0021] In the figure: sedimentation tank 1, primary filter 2, secondary filter 3, first storage tank 4, second storage tank 5, first valve 6, second valve 7, third valve 8, discard filter 9, water pump 10 Specific embodiments

[0022] As attached Figure 1 As shown, a rainwater recycling system for a smart construction site comprises a rainwater collection pipeline, a sedimentation tank (1), a primary filter (2), a rainwater diversion device, a first storage tank (4), a second storage tank (5) and an intelligent monitoring module, characterized in that: rainwater is collected through a collection pipeline and uniformly flows into the sedimentation tank (1); after being processed in the sedimentation tank (1), the rainwater passes through the primary filter (2); the rainwater after primary filtration is connected to a first diversion branch and a second diversion branch through an outlet pipeline, and the first diversion branch is connected to the first storage tank (4); it also comprises a secondary filter (3), the second diversion branch is connected to the secondary filter (3), and the outlet of the secondary filter (3) is connected to the second storage tank (5); A first valve (6) is provided at the inlet of the first shunt branch, a second valve (7) is provided at the inlet of the second shunt branch, a bypass pipeline is provided at the outlet of the first shunt branch and the secondary filter (3), and a third valve (8) is provided on the bypass pipeline; the intelligent monitoring module is connected to the first valve (6), the second valve (7) and the third valve (8), and the intelligent monitoring module controls the opening and closing of the first valve (6), the second valve (7) and the third valve (8) according to a control mode, thereby controlling the flow of rainwater in the first shunt branch and the second shunt branch; the control mode includes an automatic control mode, a primary purification mode and a deep purification mode.

[0023] Preferably, a discard filter (9) may be provided at the entrance of the sedimentation tank (1), and the discard filter (9) removes the surface garbage brought by the rainwater collection pipe. It is mainly used for rainwater collection and treatment in places such as roofs and hardened ground, and pollutants such as dust, oil, bird droppings, etc. contained in the initial rain need to be discarded. There are many types of initial rain discard equipment, including siphon-type roof rainwater collection systems and ground rainwater collection systems, which can adopt time control or water volume control methods, such as flow control and rainfall control; the working principle of the discard filter (9) is that during the initial rainfall, due to the effect of gravity, the first 2-5mm of heavily polluted rainwater will be discharged first through the low-level open sewage pipe. As the rainfall increases, the flow rate of the rainwater collection pipe increases, and the rainwater enters the sedimentation tank (1) through a filter screen with an aperture of 60-70 mesh.

[0024] After being exposed to the sun and precipitated for a long time in the sedimentation tank (1), the rainwater enters the primary filter (2). Furthermore, a precipitant is added to the sedimentation tank (1), and the time for the rainwater to stay in the sedimentation tank (1) should not be less than 20 hours, preferably 25-70 hours, so that the precipitant can play a better role.

[0025] The first storage tank (4) is provided with a first water level detection device and a first water quality sensor, and the second storage tank (5) is provided with a second water level detection device and a second water quality sensor; water quality data is obtained through the first water quality sensor and the second water quality sensor, and the water quality data is provided with a first water quality grade value and a second water quality grade value, wherein the second water quality grade value is higher than the first water quality grade value. Specific water quality data include at least two of pH value, dissolved oxygen (DO), turbidity, chemical oxygen demand (COD), total organic carbon (TOC), ammonia nitrogen, nitrate, and heavy metal content. A simple visual water quality grade evaluation standard is obtained based on the water quality data, for example, the water quality is divided into 5 grades, and the higher the grade, the better the water quality.

[0026] The information collected by the intelligent monitoring module is transmitted to the central control system through the wireless communication module. The central control system includes a user interaction interface, and the user can monitor the water quality information through the display; the user can select the automatic control mode, the primary purification mode and the deep purification mode according to the water use situation.

[0027] In the present invention, water with water quality data of the first water quality grade value has not passed through the secondary filter (3), while water with water quality data of the second water quality grade value is rainwater filtered through the secondary filter (3). Therefore, in the automatic control mode, the water quality of the purified rainwater in the first storage tank (4) is at the first water quality grade value, and the water quality of the purified rainwater in the second storage tank (5) is at the second water quality grade value. Users can use the water in the first storage tank (4) to wash construction site vehicles and roads, and use the water in the first storage tank (4) for waterscape greening, toilet flushing, air conditioning cooling water replenishment, etc.

[0028] In the present invention, the primary filter (2) comprises an equalizing plate, a pebble layer, a sand layer, and a fine sand layer, and the secondary filter (3) comprises an activated carbon layer, a microporous membrane layer, and an ultraviolet sterilization lamp.

[0029] In the primary filter (2), the equalizing plate serves as the first layer of the primary filter (2). The main function of the equalizing plate is to evenly distribute the incoming rainwater, prevent the water flow from directly impacting the filter layer below, reduce the scouring of the lower filter material by the water flow, and ensure the uniformity and sustainability of the filtering effect. The pebble layer is located below the equalizing plate. The pebble layer uses the larger gaps between the pebbles to initially filter out larger particle impurities in the rainwater, such as leaves, branches, mud, etc., to reduce the load on the subsequent filter layer. The sand and gravel layer follows the pebble layer. The sand and gravel layer uses medium-sized sand and gravel to further intercept smaller particulate matter, while increasing the filtering surface area and improving the filtering efficiency. The fine sand layer serves as the last layer of the primary filter (2). The fine sand layer is composed of fine sand and can intercept finer particles, ensuring that the water quality flowing out of the primary filter (2) reaches a certain cleanliness level, providing pretreatment for the secondary filter (3).

[0030] In the secondary filter (3), the activated carbon layer uses the high adsorption performance of activated carbon to remove organic matter, chlorine, odor and some heavy metal ions in the water, further improving the taste and safety of the water. The microporous membrane layer effectively removes bacteria, algae and smaller suspended particles in the water through physical interception, ensuring the microbial safety of the effluent and bringing the water quality to a higher standard. As the last line of defense of the secondary filter (3), the ultraviolet sterilization lamp uses the bactericidal effect of ultraviolet rays to destroy the DNA structure of bacteria, viruses and other microorganisms in the water, achieving a thorough disinfection effect and ensuring the hygienic safety of the water.

[0031] The secondary filter (3) is a key component in the rainwater recycling system, and its design and maintenance are crucial to the performance of the entire system. In the present invention, the secondary filter (3) adopts a detachable and replaceable structure, which significantly improves the convenience and maintenance efficiency of the filter.

[0032] The detachable and replaceable structure provides users with greater flexibility. In different usage scenarios and water quality conditions, users can choose filters of different types or specifications according to actual needs to meet specific filtration requirements. For example, for rainwater containing more suspended particles, a high-density filter medium can be selected; and for occasions where microorganisms need to be removed, a filter with antibacterial function can be selected.

[0033] In addition, this design also helps to extend the service life of the filter and improve the stability of the system. By regularly removing and replacing the filter, the filter material can be prevented from being blocked or failing due to long-term use, thus ensuring the durability of the filtering effect and the continuous operation of the system.

[0034] In order to further optimize the user experience, the disassembly and replacement structure of the secondary filter (3) can also be combined with an intelligent monitoring system. The system can monitor the working status and service life of the filter in real time. When the filter needs to be replaced or cleaned, it will automatically send a reminder message to the user to guide the user to perform corresponding maintenance operations. A flow sensor is also provided at the outlet of the secondary filter (3). The intelligent monitoring module is connected to the flow sensor. By recording the total water flow passing through the secondary filter (3), it is determined whether the secondary filter (3) has reached the upper limit of use. If the secondary filter (3) has reached the upper limit of use, the intelligent monitoring module will send a warning signal that the secondary filter (3) needs to be replaced. The user can see the warning signal that the secondary filter (3) needs to be replaced through the user interface of the central control system.

[0035] As attached Figure 2 As shown, the specific working steps of the automatic control mode are as follows: S1: keep the third valve (8) closed, open the first valve (6), close the second valve (7), the water pump (10) starts to work, and the purified rainwater flows into the first storage tank (4); S2: when the water level of the first storage tank (4) reaches a set critical value, close the first valve (6), open the second valve (7), and the purified rainwater flows into the second storage tank (5);

[0036] S3: When the water levels of the first storage tank (4) and the second storage tank (5) reach their respective set critical values, the water pump (10) is stopped, and the first valve (6), the second valve (7) and the third valve (8) are closed.

[0037] Therefore, in this automatic control mode, the system first ensures that the water demand for road and vehicle washing is met. Road washing is essential to maintaining the cleanliness and beauty of the urban environment, while vehicle washing helps reduce the spread of pollutants, keep vehicles clean and roads tidy.

[0038] Only after the road and vehicle washing needs are fully met, the system will further consider other water needs, such as waterscape greening, toilet flushing and air conditioning cooling water replenishment. Waterscape greening can not only improve the beauty of the environment, but also increase air humidity and improve air quality. Toilet flushing is a basic need for public health facilities, while air conditioning cooling water replenishment is a necessary condition to ensure the normal operation of the air conditioning system.

[0039] Through this priority sorting and intelligent allocation, the automatic control mode of the present invention can maximize the utilization efficiency of water resources and reduce waste.

[0040] As attached Figure 3 As shown, the specific working steps of the primary purification mode are: S1: keep the third valve (8) open, the first storage tank (4) is connected to the second storage tank (5), open the first valve (6), close the second valve (7), the water pump (10) starts to work, and the purified rainwater flows into the first storage tank (4); S2: when the water level of the first storage tank (4) reaches the set critical value, stop the water pump (10).

[0041] As attached Figure 4 As shown, the specific working steps of the deep purification mode are: S1: keep the third valve (8) open, the first storage tank (4) is connected to the second storage tank (5), open the second valve (7), close the first valve (6), the water pump (10) starts working, and the purified rainwater flows into the second storage tank (5); S2: when the water level of the second storage tank (5) reaches the set critical value, stop the water pump (10).

[0042] Primary purification mode and deep purification mode are two different treatment processes in the rainwater recycling system. They are designed for different application scenarios and water quality requirements to meet diverse water use purposes.

[0043] The primary purification mode is mainly aimed at the preliminary treatment of rainwater, and its purpose is to remove suspended particles, silt and other larger particles of pollutants in rainwater. This process usually includes steps such as screening, sedimentation and primary filtration. Although the water quality of rainwater after primary purification is improved to a certain extent, it only reaches the first water quality grade value, which is suitable for occasions with low water quality requirements. For example, on a construction site, rainwater after primary purification can be used for washing construction vehicles and roads, which not only effectively utilizes rainwater resources, but also reduces construction costs, while also reducing dependence on traditional water sources.

[0044] Relatively speaking, the deep purification mode is a more complex and comprehensive water treatment process. On the basis of primary purification, it adds more purification steps, such as biological treatment, activated carbon adsorption, reverse osmosis, ultrafiltration or ultraviolet disinfection, to ensure that the water quality of rainwater reaches a higher standard and reaches the second water quality grade value. The deep purification mode can remove more soluble pollutants, pathogens and harmful chemicals, so that the rainwater quality meets or even exceeds the standards for drinking water or sensitive uses. This high-quality rainwater can be used to irrigate precious plants, supplement waterscapes, and even as a supplement to domestic water.

[0045] However, although the deep purification mode provides higher quality water, its treatment process is also more complicated, involving more equipment, energy and maintenance costs. Therefore, when choosing the rainwater purification mode, users need to make comprehensive considerations based on their actual water demand, cost budget and environmental benefits. For example, if the project has high requirements for water quality, or needs to use rainwater as an important water resource supplement, then investing in the deep purification mode may be reasonable. On the contrary, if the water demand is mainly for non-drinking purposes and the budget is limited, the primary purification mode may be more economical and practical.

[0046] In summary, primary purification and deep purification modes each have their own advantages and limitations, and they provide users with flexible options to adapt to different water use scenarios and water quality requirements. Through intelligent monitoring and automatic control systems, users can manage rainwater resources more accurately, optimize the water quality treatment process, and maximize cost-effectiveness and environmental benefits.

[0047] Due to different degrees of purification, when performing deep purification, it is possible to first empty the rainwater in the first storage tank (4) and then select the deep purification mode.

[0048] Since the first storage tank (4) is connected to the second storage tank (5) in the primary purification mode and the deep purification mode, if in the primary purification mode or the deep purification mode, there is a large difference between the water levels displayed by the first water quality sensor of the first storage tank (4) and the second water quality sensor of the second storage tank (5), specifically, the difference between the water level parameter obtained by the first water quality sensor and the water level parameter obtained by the second water quality sensor is greater than 15-20 cm, it can be determined that the connecting pipe arranged between the bottom of the first storage tank (4) and the second storage tank (5) is blocked. The intelligent monitoring module will send a warning signal of the blocking of the connecting pipe, and the user can see the warning signal of the blocking of the connecting pipe through the user interface of the central control system.

[0049] In addition to the first, second and third valves (8) mentioned above, the present invention also has various detailed valves and components to achieve normal operation of the system, which will not be described in detail here.

[0050] The intelligent monitoring module plays a vital role in the rainwater recycling system of the smart construction site of the present invention. It realizes real-time monitoring of the status of key equipment through integrated sensors and communication technology. Specifically, the module can accurately monitor the water level information of the first storage tank (4) and the second storage tank (5), ensuring that the system automatically adjusts the water inlet and outlet according to the water level changes to avoid overflow or drying up. At the same time, it can also collect and analyze water quality data in real time, such as key parameters such as pH value, dissolved oxygen, turbidity, etc., which are crucial for evaluating water quality and guiding purification processes.

[0051] In addition to water level and water quality monitoring, the intelligent monitoring module also has the ability to monitor the opening and closing status of each valve in the system, thereby ensuring that the water flows according to the established process flow and preventing any possible system failure or operational errors. All of this monitored information is transmitted to the central control system via wireless or wired networks to achieve centralized data management and control.

[0052] Users can intuitively view all monitoring data and system status through a friendly user interface, and perform remote operation and control. This intelligent monitoring and management method not only improves the operating efficiency and reliability of the system, but also brings users a convenient operating experience, making water resource management more intelligent and automated.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rainwater recycling system for a smart construction site, comprising a rainwater collection pipe, a sedimentation tank (1), a water pump (10), a primary filter (2), a rainwater diversion pipeline, a first storage tank (4), a second storage tank (5) and an intelligent monitoring module, characterized in that: Rainwater is collected through a collection pipeline and uniformly flows into a sedimentation tank (1). After the rainwater is processed in the sedimentation tank (1), a water pump (10) works under pressure and passes through the primary filter (2). The rainwater after primary filtration is connected to a first shunt branch and a second shunt branch through an outlet pipeline, wherein the first shunt branch is connected to a first storage tank (4). The secondary filter (3) is also included, wherein the second shunt branch is connected to the secondary filter (3), and the outlet of the secondary filter (3) is connected to a second storage tank (5). A first valve (6) is provided at the inlet of the first shunt branch, and a second valve (7) is provided at the inlet of the second shunt branch. A connecting pipe is provided between the bottoms of the first storage tank (4) and the second storage tank (5), and a third valve (8) is provided on the connecting pipe; the intelligent monitoring module is connected to the first valve (6), the second valve (7) and the third valve (8), and the intelligent monitoring module controls the opening and closing of the first valve (6), the second valve (7) and the third valve (8) according to a control mode, thereby controlling the flow of rainwater in the first branch path and the second branch path; the control mode includes an automatic control mode, a primary purification mode and a deep purification mode, thereby controlling the purified rainwater to reach different water quality levels.

2. According to the rainwater recycling system for a smart construction site of claim 1, a first water level detection device and a first water quality sensor are provided in the first storage tank (4), and a second water level detection device and a second water quality sensor are provided in the second storage tank (5); water quality data is obtained by the first water quality sensor and the second water quality sensor, and the water quality data is provided with a first water quality grade value and a second water quality grade value, wherein: The second water quality grade value is higher than the first water quality grade value; wherein, water having the water quality data of the first water quality grade value has not passed through the secondary filter (3).

3. According to the rainwater recycling system for a smart construction site as described in claim 2, the specific working steps of the automatic control mode are: S1: keep the third valve (8) closed, open the first valve (6), close the second valve (7), the water pump (10) starts working, and the purified rainwater flows into the first storage tank (4); S2: when the water level of the first storage tank (4) reaches the set critical value, close the first valve (6), open the second valve (7), and the purified rainwater flows into the second storage tank (5); S3: when the water levels of the first storage tank (4) and the second storage tank (5) both reach their respective set critical values, stop the water pump (10) and close the first valve (6), the second valve (7) and the third valve (8).

4. According to the rainwater recycling system for a smart construction site as described in claim 2, the specific working steps of the primary purification mode are: S1: keep the third valve (8) open, the first storage tank (4) is connected to the second storage tank (5), open the first valve (6), close the second valve (7), the water pump (10) starts working, and the purified rainwater flows into the first storage tank (4); S2: when the water level of the first storage tank (4) reaches the set critical value, stop the water pump (10).

5. According to the rainwater recycling system for a smart construction site as described in claim 2, the specific working steps of the deep purification mode are: S1: keep the third valve (8) open, the first storage tank (4) is connected to the second storage tank (5), open the second valve (7), close the first valve (6), the water pump (10) starts working, and the purified rainwater flows into the first storage tank (4); S2: when the water level of the second storage tank (5) reaches the set critical value, stop the water pump (10).

6. According to the rainwater recycling system for a smart construction site as described in claim 1, the primary filter (2) comprises an equalizing plate, a pebble layer, a sand layer, and a fine sand layer, and the secondary filter (3) comprises an activated carbon layer, a microporous membrane layer, and an ultraviolet sterilization lamp.

7. According to the rainwater recycling system for a smart construction site as described in claim 1, a discarded flow filter (9) is also provided at the inlet position of the sedimentation tank (1), and the discarded flow filter (9) has a built-in discarded flow filter net, and the mesh size of the discarded flow filter net is 60-70 mesh.

8. According to the rainwater recycling system for a smart construction site as described in claim 1, the information collected by the intelligent monitoring module is transmitted to the central control system through the wireless communication module. The central control system includes a user interaction interface, and the user can monitor the water quality information through the display; the user can select the automatic control mode, the primary purification mode and the deep purification mode according to the water use situation.

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