Leakage water recycling system and leakage water recycling control method

Abstract

The application discloses a kind of seepage water recycling systems and seepage water circulation control methods, including water collection subsystem and control subsystem;The water collection subsystem is located in the box of underground facility, including drainage ditch and water collection pit;The bottom of the water collection pit is provided with a submerged sewage pump;The control subsystem includes power module, control module, liquid level detection module, pressure detection module, first electromagnetic valve and second electromagnetic valve;The control module is used to control submerged sewage pump, first electromagnetic valve and second electromagnetic valve according to the information collected by liquid level detection module and pressure detection module.Set the ground elevation where water collection pit is located>alarm water level>steady pressure water level>stop pump water level;The control method judges water level condition by liquid level detection module, to execute the operation of corresponding submerged sewage pump, first electromagnetic valve and second electromagnetic valve, to realize the conversion of steady pressure stage, ground flushing water stage and external discharge water stage.

Description

Technical Field

[0001] This invention relates to the field of drainage for underground municipal facilities, and specifically to a system for recycling seepage water from underground water treatment plants and other underground municipal facilities, as well as a method for controlling seepage water circulation. Background Technology

[0002] Underground municipal facilities have become an indispensable part of urban development, with facilities such as underground water treatment plants, integrated utility tunnels, and underground public parking becoming increasingly common.

[0003] Taking underground water treatment plants as an example, with the increasing prevalence of their construction and renovation, the widespread adoption of underground water treatment plants faces numerous challenges. These include the large area they occupy, numerous construction joints / expansion joints, and a large number of pipes, sleeves, and openings in and out of the plant's enclosure. The internal water tanks also have complex structures and varying construction quality. Consequently, there is significant structural leakage within the underground water treatment plant enclosure. This leakage primarily consists of groundwater leaking from outside the enclosure, which is of relatively good quality. Previously, the common practice neglected the comprehensive utilization of this leakage water, directly collecting it in sump pits and discharging it outdoors using pumps. In fact, the quality of this leakage water is essentially the same as the groundwater outside the enclosure and can be perfectly suitable for use for washing the floor inside the enclosure.

[0004] Taking a 100,000-ton / day underground wastewater treatment plant in a coastal area of ​​eastern my country as an example, the underground tank of this wastewater treatment plant is approximately rectangular in size, with external dimensions of about 250m × 150m × 15m. The total area of ​​the tank in contact with groundwater is approximately 50,000㎡, with a seepage rate of 0.1L / (㎡·d). The calculated structural seepage rate of this tank is approximately 5.0m³. 3 / d. The floor area inside the enclosure that needs washing is approximately 10,000 square meters. Based on a washing frequency of every two days, the structural leakage water from the enclosure is sufficient to meet the floor washing requirements. Therefore, this paper considers designing a leakage water recycling system and leakage water circulation control method to fully utilize the structural leakage water from the enclosure. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a seepage water recycling system and a seepage water circulation control method. The system and method are particularly suitable for underground water treatment plants or underground utility tunnels with high groundwater levels. The seepage water recycling system of this invention, taking into account the characteristics of the seepage water volume and quality, adopts a reinforced concrete structure, and the specific structural dimensions can be appropriately adjusted according to the scale of the underground space.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A leakage water recycling system includes a water collection subsystem and a control subsystem;

[0008] The water collection subsystem is located inside the underground facility's enclosure and includes a drainage ditch and a water collection pit. The drainage ditch is set on the ground around the inside of the underground facility's enclosure to collect water that leaks into the enclosure. The water collection pit is used to collect water from the drainage ditch. A liquid level detection module is installed on the inner wall of the water collection pit to detect the liquid level in the water collection pit. A submersible pump is installed at the bottom of the water collection pit.

[0009] The control subsystem includes a power module, a control module, a liquid level detection module, a pressure detection module, a first solenoid valve, and a second solenoid valve. The power module supplies power to the components in the system. The control module controls the submersible pump, the first solenoid valve, and the second solenoid valve based on information collected by the liquid level detection module and the pressure detection module. The liquid level detection module is located on the inner wall of the sump and is used to detect the liquid level in the sump and transmit it to the control module. The outlet of the submersible pump is connected to the pressure detection module, the first solenoid valve, and the second solenoid valve in sequence via a pipeline. The other end of the first solenoid valve is connected to a water recycling device, and the other end of the second solenoid valve is connected to an outdoor outlet.

[0010] The liquid level detection module, pressure detection module, submersible pump, first solenoid valve, and second solenoid valve are all electrically connected to the control module.

[0011] Furthermore, multiple segmented drainage ditches are installed below the expansion joints and through-wall sleeve areas of the enclosure. These segmented drainage ditches collect drainage in different areas, and each drainage ditch is connected to the others by a pipeline.

[0012] Furthermore, the drainage ditch is set horizontally along the inner wall of the box, with a width of 20-30cm and a depth of 15-30cm, and its interior is sloped at approximately 0.3% towards the water collection pit.

[0013] The leakage water circulation control method using the above-mentioned leakage water recycling system includes:

[0014] The alarm water level, pressure stabilizing water level, and pump stop water level are set based on the ground elevation of the sump; the relationship between the elevations of each water level is as follows: ground elevation of the sump > alarm water level > pressure stabilizing water level > pump stop water level;

[0015] The leaking water flows from left to right into the sedimentation pit along the drainage ditch, where it undergoes initial sedimentation. Then, the water flows into the sedimentation channel, where the sedimentation time is no less than 1 minute. After that, the water flows through the overflow weir and finally into the collection pit.

[0016] Pressure Stabilization Phase: The level detection module monitors the water level in the sump in real time. When the water level in the sump is greater than or equal to the stabilization level but less than the alarm level, the submersible pump is activated, allowing water from the sump to flow through the pipeline to the pressure detection module. When the control module detects that the pressure in the pipeline reaches 0.2MPa-0.3MPa, the submersible pump is shut off, maintaining a pressure of 0.2MPa-0.3MPa in the pipeline. During this phase, the first and second solenoid valves remain closed. If the water level in the sump does not reach the stabilization level, no operation is performed. If the water level exceeds the alarm level, the system enters the external drainage phase.

[0017] Ground flushing water stage: When a user needs to flush the ground, the control module determines whether the water level collected by the liquid level detection module is greater than or equal to the alarm water level. If so, the system enters the external drainage stage; otherwise, it continues to determine whether the water level is greater than or equal to the stabilizing water level but less than the alarm water level. If not, it means that the water level in the sump has not reached the stabilizing water level, and the system does not perform any operation. When the water level is greater than or equal to the stabilizing water level but less than the alarm water level, the submersible sewage pump is turned on, the first solenoid valve is opened, and the water in the sump enters the reuse water equipment through the pipeline for reuse. Until the water level reaches the pump stop water level, the submersible sewage pump and the first solenoid valve are turned off, and then the system returns to the stabilizing stage operation. During this stage, the second solenoid valve remains closed.

[0018] External drainage stage: When the control module determines that the liquid level detection module has detected that the water level in the sump has reached the alarm level, the submersible sewage pump is started and the second solenoid valve is opened. The water in the sump is discharged to the outdoor drainage network through the pipe until the water level reaches the pump stop level. At the same time, the submersible sewage pump and the second solenoid valve are closed. During this stage, the first solenoid valve remains closed.

[0019] Once the water level in the sump reaches the stabilizing level, the stabilizing phase operation is repeated.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The system described in this invention integrates seepage water reuse and discharge. When the water quantity and quality permit, it is suitable for reuse. This invention is suitable for the reuse and discharge of seepage water in underground facilities, which improves the utilization rate of seepage water and saves water resources.

[0022] The control method sets three water level values ​​based on the ground elevation of the sump, judges the water level using a level gauge, and then executes the corresponding operation of the submersible pump, the first solenoid valve, and the second solenoid valve to achieve the switching between the pressure stabilization stage, the ground flushing water stage, and the external drainage stage. The method is simple to operate and easy to implement, and has strong promotional value. Attached Figure Description

[0023] Figure 1This is a plan view of the circulating water process of the underground water plant seepage water recycling system described in the embodiment;

[0024] Figure 2 yes Figure 1 Section 1-1;

[0025] Figure 3 yes Figure 2 Schematic diagram of CIMC's water pit structure;

[0026] Figure 4 This is a flowchart of the leakage water circulation control method.

[0027] In the picture:

[0028] 1: First solenoid valve; 2: Second solenoid valve; 3: Remote pressure gauge

[0029] 4: Submersible sewage pump; 5: Reuse pipeline; 6: First pipeline

[0030] 7: First branch pipe; 8: Second branch pipe; 9: Alarm water level.

[0031] 10: Stabilizing water level; 11: Pump-stopped water level; 12: Guardrail. Detailed Implementation

[0032] To make the objectives, technical solutions, beneficial effects, and significant advancements of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings provided in the examples of the present invention. Obviously, all the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The working process of the invention will be further explained below with reference to the accompanying drawings.

[0034] A method for controlling the circulation of seepage water in an underground water treatment plant, the method utilizing an underground water treatment plant seepage water recycling system, including a water collection subsystem and a control subsystem, wherein the service coverage of the water collection subsystem is preferably one subsystem per fire compartment. Figure 1-2As shown, the water collection subsystem is located within the underground water treatment plant's enclosure, which is made of reinforced concrete. A circular drainage ditch is constructed around the perimeter of the enclosure to collect wastewater. This ditch is horizontal, 20-30cm wide and 15-30cm deep, with an internal slope of approximately 0.3% towards the collection pit. The end of the drainage ditch connects to a sedimentation pit, which in turn connects to a sedimentation channel. The other end of the sedimentation channel connects to the collection pit. The drainage ditch, sedimentation pit, sedimentation channel, and collection pit are sequentially connected and all located within the enclosure. Guardrails 12 are installed at the sedimentation pit, sedimentation channel, and collection pit to prevent construction workers from falling into the water. Depending on the actual situation, multiple segmented drainage ditches can also be installed below expansion joints and areas prone to seepage, such as through-wall sleeves. These segmented drainage ditches collect wastewater in designated areas, and the ditches are connected by pipelines.

[0035] The bottom elevation of the drainage ditch is H1-0.200, the bottom elevation of the sedimentation pit is H1-1.000, the bottom elevation of the sedimentation channel is H1-0.500, the elevation of the overflow weir is H1-0.200, and the bottom elevation of the sump is H1-1.500. H1 is the ground elevation where the sump is located. The silt in the sedimentation pit and sedimentation channel can be removed periodically according to the actual situation.

[0036] like Figure 3 As shown, two submersible sewage pumps 4 are installed side by side at the bottom of the sump, at an elevation of H1-1.500. The submersible sewage pumps 4 are used in one and standby, controlled by a frequency converter, and work in rotation according to a pre-set program.

[0037] The control subsystem includes a power module, a control module, an ultrasonic level gauge, a remote pressure gauge 3, a first solenoid valve 1, and a second solenoid valve 2. The power module is an electrical control cabinet (containing power distribution and control components) located outside the enclosure, supplying power to the submersible pumps 4, the level gauge, the first and second solenoid valves, and the remote pressure gauge 3. An ultrasonic level gauge (not shown in the figure) is fixed to the inner wall of the sump, used to detect the water level in the sump, and is connected to the control module via an electrical signal. The outlets of the two submersible pumps 4 are connected in series at one end of a first pipe 6, which is then sequentially connected to the remote pressure gauge 3, a second branch pipe 8, and a first branch pipe 7. The remote pressure gauge 3 is used to detect the pressure in the sump. The first branch pipe 7 is connected to one end of the first solenoid valve 1, and the other end of the first solenoid valve 1 is connected to a reuse pipe 5. The other end of the reuse pipe 5 is connected to a water recycling system, which is used to recover and treat greywater. The second branch pipe 8 is connected to one end of the second solenoid valve 2, and the other end of the second solenoid valve 2 is connected to an outdoor outlet via a pipeline. The remote pressure gauge 3, the first solenoid valve, and the second solenoid valve are all located above the sump, at elevation H1+3.000. The first and second solenoid valves are electrically connected to the control module; the remote pressure gauge 3 is connected to the control module via an electrical signal. The control module collects information from the level gauge and the remote pressure gauge 3 within the system, and controls the opening and closing of the submersible pump 4 and the first and second solenoid valves based on the collected information. The control module utilizes a programmable logic controller (PLC) to achieve fully automatic control. The electrical control cabinet is made of stainless steel with a protection level of not less than IP55 and is mounted using a stainless steel bracket.

[0038] like Figure 4 As shown, the groundwater plant seepage water circulation control method specifically includes:

[0039] Measure and obtain the ground elevation of the sump, which is designated as H1. Set the alarm water level 9 to H1-0.300 (i.e., the same height as the top edge of the sump), the pressure stabilizing water level 10 to H1-1.000 (i.e., the same height as the bottom elevation of the sedimentation pit), and the pump stop water level 11 to H1-1.200.

[0040] The leaking water flows from left to right into the sedimentation pit along the drainage ditch. In the sedimentation pit, the sand and soil in the water undergo preliminary sedimentation. Then the water flows into the sedimentation channel, where the sedimentation time is no less than 1 minute, to further settle the incoming water. After sedimentation, the water flows through the overflow weir and finally into the collection pit.

[0041] Pressure Stabilization Phase: During this phase, when no water is used, the level gauge monitors the water level in the sump in real time. If the water level in the sump does not reach the stabilization level, no operation is performed. As leakage increases, the water level in the sump gradually rises. When the water level in the sump is greater than or equal to the stabilization level 10 and less than the alarm level 9 (H1-1.000), the submersible pump 4 is activated. The submersible pump 4 pressurizes the water in the sump and flows it through the first pipe 6 into the remote pressure gauge 3. The remote pressure gauge 3 monitors the pressure in the first pipe 6 and uploads the data to the control module. When the control module detects that the pressure in the second pipe reaches 0.2MPa-0.3MPa, the submersible pump 4 is shut off, maintaining a pressure of 0.2MPa-0.3MPa in the second pipe. During this phase, the first solenoid valve 1 and the second solenoid valve 2 remain closed. If the water level exceeds the alarm level 9, the system enters the external drainage phase.

[0042] Ground flushing water usage stage: Based on the preset ground flushing water usage frequency and time, or when the user needs to flush the ground, the control module determines whether the water level collected by the level gauge is greater than or equal to the alarm water level. If so, the system enters the external drainage stage; otherwise, it continues to determine whether the water level is greater than or equal to the stabilizing water level 10 and less than the alarm water level 9. If not, it means that the water level in the sump has not reached the stabilizing water level 10, and the system does not perform any operation; directly determining that the monitored water level is greater than or equal to the stabilizing water level 10 and less than the alarm water level 9, the submersible sewage pump 4 is turned on, the first solenoid valve 1 is opened, and the water flows sequentially through the first pipe 6, the first branch pipe 7, and the first solenoid valve 1 into the reuse pipe 5, and then flows into the reuse water equipment for reuse; until the water level reaches the pump stop water level 11, the submersible sewage pump 4 and the first solenoid valve are turned off, and then the system returns to the pressure stabilization stage operation; during this stage, the second solenoid valve 2 remains closed;

[0043] External drainage stage: When the level gauge detects that the water level in the sump reaches the alarm level 9, i.e., H1-0.300m, some of the water in the sump needs to be drained. The submersible sewage pump 4 is started, and the second solenoid valve 2 is opened. The submersible sewage pump 4 drains the water in the sump through the first pipe 6, the second branch pipe 8, and the second solenoid valve 2 to the outdoor drainage network until the water level reaches the pump stop level 11, i.e., H1-1.200m. At the same time, the submersible sewage pump 4 and the second solenoid valve are closed. During this stage, the first solenoid valve 1 remains closed.

[0044] Once the water level in the sump reaches the stable pressure level of 10, the pressure stabilization phase operation is repeated.

[0045] In practice, if the water quality and quantity of underground facilities cannot meet the standards for reuse, sedimentation pits and sedimentation channels can be omitted, and the leaked water can be directly discharged into the collection pit through the drainage ditch.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A leakage water recycling system, comprising a water collection subsystem and a control subsystem; The water collection subsystem is located inside the underground facility box and includes a drainage ditch and a water collection pit. The drainage ditch is set on the ground around the inside of the underground facility box to collect water that leaks into the box. The water collection pit is used to collect water from the drainage ditch. The inner wall of the water collection pit is equipped with a liquid level detection module to detect the water level in the water collection pit. A submersible sewage pump (4) is installed at the bottom of the water collection pit. The control subsystem includes a power module, a control module, a liquid level detection module, a pressure detection module, a first solenoid valve (1), and a second solenoid valve (2). The power module is used to supply power to the components in the system. The control module is used to control the submersible pump (4), the first solenoid valve (1), and the second solenoid valve (2) based on the information collected by the liquid level detection module and the pressure detection module. The liquid level detection module is located on the inner wall of the sump and is used to detect the water level in the sump and transmit it to the control module. The outlet of the submersible pump (4) is connected to the pressure detection module, the first solenoid valve (1), and the second solenoid valve (2) in sequence through a pipeline. The other end of the first solenoid valve (1) is connected to the recycled water equipment, and the other end of the second solenoid valve (2) is connected to the outdoor outlet. The liquid level detection module, pressure detection module, submersible pump (4), first solenoid valve (1) and second solenoid valve (2) are all electrically connected to the control module. The leakage water recycling control method of the leakage water recycling system includes: The alarm water level, pressure stabilizing water level, and pump stop water level are set based on the ground elevation of the sump; the relationship between the elevations of each water level is as follows: ground elevation of the sump > alarm water level > pressure stabilizing water level > pump stop water level; The leaking water flows from left to right into the sedimentation pit along the drainage ditch, where it undergoes initial sedimentation. The water then flows into the sedimentation channel, where the sedimentation time is no less than 1 minute, to further settle the incoming water. After sedimentation, the water flows through the overflow weir and finally into the collection pit. Pressure Stabilization Stage: The liquid level detection module monitors the water level in the sump in real time. When the water level in the sump is greater than or equal to the stabilization water level (10) and less than the alarm water level (9), the submersible pump (4) is turned on to flow the water in the sump through the pipeline to the pressure detection module. When the control module detects that the pressure in the pipeline reaches 0.2MPa-0.3MPa, the submersible pump is turned off to keep the pressure in the pipeline at 0.2MPa-0.3MPa. During this stage, the first solenoid valve (1) and the second solenoid valve (2) remain closed. If the water level in the sump does not reach the stabilization water level (10), no operation is performed. If the water level exceeds the alarm water level (9), the system enters the external drainage stage. Ground flushing water stage: When the user needs to flush the ground, the control module judges whether the water level collected by the liquid level detection module is greater than or equal to the alarm water level (9). If so, the system enters the external drainage stage; otherwise, it continues to judge whether the water level is greater than or equal to the stabilizing water level and less than the alarm water level (9). If not, it means that the water level in the sump has not reached the stabilizing water level (10), and the system does not perform any operation. When the water level is greater than or equal to the stabilizing water level (10) and less than the alarm water level (9), the submersible sewage pump (4) is turned on and the first solenoid valve (1) is opened. The water in the sump enters the water reuse equipment through the pipeline for reuse. Until the water level reaches the pump stop water level (11), the submersible sewage pump (4) and the first solenoid valve (1) are turned off, and then the system returns to the stabilizing stage operation. In this stage, the second solenoid valve (2) remains closed. External drainage stage: When the control module determines that the liquid level detection module detects that the water level in the sump has reached the alarm level (9), the submersible sewage pump (4) is started and the second solenoid valve (2) is opened. The water in the sump is discharged to the outdoor drainage network through the pipe until the water level reaches the pump stop level (11). At the same time, the submersible sewage pump (4) and the second solenoid valve (2) are closed. During this stage, the first solenoid valve (1) remains closed. Once the water level in the sump reaches the pressure stabilization level (10), the pressure stabilization phase operation is repeated.

2. The leakage water recycling system according to claim 1, characterized in that, Multiple segmented drainage ditches are installed below the expansion joints and through-wall sleeve areas of the enclosure. The segmented drainage ditches collect drainage in different areas, and each drainage ditch is connected by a pipeline in sequence.

3. The leakage water recycling system according to claim 1, characterized in that, The drainage ditch is set horizontally along the inner wall of the box, with a width of 20-30cm and a depth of 15-30cm, and its interior is sloped at approximately 0.3% towards the water collection pit.

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