Separation test device for similar soluble substances and separation test method for similar soluble substances

Abstract

The application discloses a similar soluble substance separation test device, which comprises an original water storage module, a first purification module, a second purification module and pipelines connecting the modules and components in the modules. The first purification module is used for taking water in the original water storage module and purifying the water to form a first concentrated liquid and a first treated liquid. The first concentrated liquid returns to the first purification module, and the first treated liquid returns to the original water storage module. The second purification module is used for taking water in the first purification module and purifying the water to form a second concentrated liquid and a second treated liquid. The second concentrated liquid returns to the second purification module, and the second treated liquid returns to the first purification module. The similar soluble substance separation test device can effectively separate at least two substances with similar properties and soluble in water.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of substance separation, in particular to a separation test device for similar soluble substances and a separation test method for similar soluble substances based on the separation test device. BACKGROUND

[0002] In industrial production, there are many similar substances in aqueous solution systems. For example, in the primary circuit and related systems in the field of nuclear power, there are silicates of similar substances dissolved in the weak acid boric acid system. Both of these substances are extremely weak acids, with complex acid radical ions, similar molecular formulas and ion sizes, and are difficult to separate in aqueous solution systems. Because the presence of silicic acid will affect safe production, therefore, an effective technology for separating the two is urgently needed. SUMMARY

[0003] In view of this, in order to achieve the above-mentioned purposes, one of the purposes of the present application is to provide a separation test device for similar soluble substances, which can effectively separate two similar soluble substances.

[0004] In order to achieve the above-mentioned purposes, the present application adopts the following technical solutions:

[0005] A separation test device for similar soluble substances, comprising a raw water storage module, a first purification module, a second purification module, and pipelines connecting each module and each component in each module, the first purification module is used to draw water from the raw water storage module and purify it to form a first concentrated liquid and a first treated liquid, the first concentrated liquid returns to the first purification module, and the first treated liquid returns to the raw water storage module; the second purification module is used to draw water from the first purification module and purify it to form a second concentrated liquid and a second treated liquid, the second concentrated liquid returns to the second purification module, and the second treated liquid returns to the first purification module.

[0006] According to some preferred embodiments of the present application, the first purification module comprises a first delivery pump, a first water tank, a first booster pump, and a first separation membrane, the first delivery pump is arranged between the bottom of the raw water storage module and the top of the first water tank, the first booster pump is arranged between the first water tank and the first separation membrane, a first backflow pipeline is arranged between the first separation membrane and the first water tank, and a second backflow pipeline is arranged between the first separation membrane and the raw water storage module.

[0007] According to some preferred embodiments of the present application, the first purification module comprises a first pressure control pipeline, one end of the first pressure control pipeline is communicated between the first booster pump and the first separation membrane, and the other end of the first pressure control pipeline is communicated on the first water tank.

[0008] According to some preferred embodiments of the present application, the first water tank is provided with a first heater; and the first return pipeline is provided with a first cooler.

[0009] According to some preferred embodiments of the present application, the second purification module comprises, in sequence, a second delivery pump, a second water tank, a second booster pump, and a second separation membrane, the second delivery pump is arranged between the bottom of the first water tank and the top of the second water tank, the second booster pump is arranged between the second water tank and the second separation membrane, a third return pipeline is arranged between the second separation membrane and the second water tank, and a fourth return pipeline is arranged between the second separation membrane and the raw water storage module.

[0010] According to some preferred embodiments of the present application, the second purification module comprises a second pressure control pipeline, one end of the second pressure control pipeline is communicated between the second booster pump and the second separation membrane, and the other end of the second pressure control pipeline is communicated on the second water tank.

[0011] According to some preferred embodiments of the present application, the second water tank is provided with a second heater; and the third return pipeline is provided with a second cooler.

[0012] According to some preferred embodiments of the present application, the similar soluble substances at least comprise a first component and a second component (such as boric acid and silicic acid, both of which have similar molecular formula and ion size, similar solubility in water, and are difficult to separate), the first separation membrane is used to separate the water in the first water tank into the first concentrated liquid and the first treated liquid, and the second separation membrane is used to separate the water in the second water tank into the second concentrated liquid and the second treated liquid.

[0013] According to some preferred embodiments of the present application, the first component is boric acid, and the second component is silicic acid.

[0014] According to some preferred embodiments of the present application, the first separation membrane and / or the second separation membrane is a reverse osmosis membrane, and the pore size of the reverse osmosis membrane is 0.6 nm-2 nm.

[0015] According to some preferred embodiments of the present application, the raw water storage module comprises a raw water tank, and the raw water tank is provided with a first liquid level sensor and / or a first temperature sensor.

[0016] According to some preferred embodiments of the present application, the first water tank is provided with a second liquid level sensor and / or a second temperature sensor; and / or, the second water tank is provided with a third liquid level sensor and / or a third temperature sensor.

[0017] According to some preferred embodiments of the present application, a first connecting pipe is arranged between the bottom of the raw water tank and the top of the first water tank, and the first delivery pump is arranged on the first connecting pipe, and a first pressure gauge and a first flow meter are arranged on the first connecting pipe.

[0018] According to some preferred embodiments of the present application, a second connecting pipe is arranged between the bottom of the first water tank and the top of the second water tank, and the second delivery pump is arranged on the second connecting pipe, and a second pressure gauge and a second flow meter are arranged on the second connecting pipe.

[0019] Another object of the present application is to provide a similar soluble substance separation test method using the similar soluble substance separation test device as described above, comprising the following steps:

[0020] 1) Setting initial parameters

[0021] The initial parameters include the flow rate of the first delivery pump, the flow rate of the first booster pump, the flow rate of the second delivery pump, the flow rate of the second booster pump, and the minimum and maximum liquid levels of the first and second water tanks;

[0022] 2) Purification test

[0023] 2.1) Start the first delivery pump to fill the first water tank, and when the liquid level in the first water tank reaches at least 50% of the maximum liquid level, start the first booster pump to purify the water in the first water tank, and the separated first concentrate returns to the first water tank, and the first treated liquid returns to the raw water tank;

[0024] Analyze and process the content of the target substance in the first concentrate and the first treated liquid to calculate the separation efficiency and recovery rate of the first purification module;

[0025] Adjust the parameters according to the results of the separation efficiency and recovery rate, and perform separation and analysis again to calculate the separation efficiency and recovery rate of the first purification module to achieve the best separation effect;

[0026] And / or,

[0027] 2.2) Start the second delivery pump to fill the second water tank, and when the liquid level in the second water tank reaches at least 50% of the maximum liquid level, start the second booster pump to purify the water in the second water tank, and the second concentrate returns to the second water tank, and the second treated liquid returns to the first water tank;

[0028] Analyze and process the content of the target substance in the first concentrate and the first treated liquid to calculate the separation efficiency and recovery rate of the first purification module;

[0029] According to the results of separation efficiency and recovery rate, the parameters are adjusted, and the separation and analysis are performed again to calculate the second purification module and the overall separation efficiency and recovery rate to achieve the best separation effect.

[0030] For some environments, the first purification module can meet the requirements, in which case the raw water storage module and the first purification module are enabled; and for other environments, the second purification module needs to be enabled to meet the separation requirements. For example, the removal rate of silicic acid, if the silicon content is originally 3ppm and the treatment is required to be below 0.5ppm, and the boron recovery rate is required to be above 85%, the silicon removal rate of the first purification module is 70%, which cannot meet the requirements, at which time the second purification module needs to be enabled; but if the silicon content is originally 1.1ppm, then only the first purification module can meet the requirements, and the second purification module does not need to be enabled.

[0031] Due to the above technical solutions, compared with the prior art, the similar soluble substance separation test device of the present application can effectively separate at least two substances with similar properties and both soluble in water; and can continuously perform experiments to adjust the material selection and parameters to achieve the ideal separation effect. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0033] Figure 1 a schematic diagram of the similar soluble substance separation test device in the preferred embodiment of the present application;

[0034] Figure 2 a flowchart of the method for separating similar soluble substances by using the similar soluble substance separation test device in the preferred embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to make the person skilled in the art better understand the technical solutions of the present application, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0036] Embodiment 1: similar soluble substance separation test device

[0037] like Figure 1 As shown, the separation test device for similar soluble substances in this embodiment includes a raw water storage module, a first purification module, a second purification module, and pipes connecting each module and its components. The first purification module draws water from the raw water storage module and purifies it to form a first concentrated solution and a first treated solution. The first concentrated solution returns to the first purification module, and the first treated solution returns to the raw water storage module. The second purification module draws water from the first purification module and purifies it to form a second concentrated solution and a second treated solution. The second concentrated solution returns to the second purification module, and the second treated solution returns to the first purification module. The mass percentage of the first component in the first concentrated solution is greater than that of the second component, and the mass percentage of the first component in the second concentrated solution is less than that of the second component. That is, the first and second separation membranes function in opposite ways to continuously separate the two substances, achieving the effect of separating similar soluble substances. The similar soluble substances include at least a first component and a second component. In this embodiment, the first component is boric acid, and the second component is silicic acid.

[0038] The raw water storage module includes a raw water tank. The first and second purification modules have essentially the same structure: the first purification module includes, in sequence, a first transfer pump, a first water tank, a first booster pump, and a first separation membrane; the second purification module includes, in sequence, a second transfer pump, a second water tank, a second booster pump, and a second separation membrane. The first transfer pump, the first booster pump, the second transfer pump, and the second booster pump are all centrifugal. Flexible hoses can be connected to the outlets of the permeate and concentrate, allowing connection to various water tanks to accommodate different water qualities and requirements.

[0039] The first transfer pump is used to transfer water from the raw water tank to the first water tank, and the second transfer pump is used to transfer water from the first water tank to the second water tank. The first and second booster pumps are used to pressurize the first and second separation membranes, respectively, maintaining the operating pressure at 2.5-3 MPa to enhance the separation effect. The first separation membrane separates the water in the first water tank into a first concentrate and a first treated liquid, and the second separation membrane separates the water in the second water tank into a second concentrate and a second treated liquid. Both the first and second separation membranes are reverse osmosis membranes with a pore size between 0.6 nm and 2 nm, preferably NFp high-pressure nanofiltration modules.

[0040] The first delivery pump is arranged between the bottom of the raw water storage module and the top of the first water tank, the first booster pump is arranged between the first water tank and the first separation membrane, the first return pipeline is arranged between the first separation membrane and the first water tank, and the second return pipeline is arranged between the first separation membrane and the raw water storage module. The second delivery pump is arranged between the bottom of the first water tank and the top of the second water tank, the second booster pump is arranged between the second water tank and the second separation membrane, the third return pipeline is arranged between the second separation membrane and the second water tank, and the fourth return pipeline is arranged between the second separation membrane and the raw water storage module.

[0041] The first purification module comprises a first pressure control pipeline, one end of the first pressure control pipeline is communicated between the first booster pump and the first separation membrane, and the other end of the first pressure control pipeline is communicated on the first water tank. The second purification module comprises a second pressure control pipeline, one end of the second pressure control pipeline is communicated between the second booster pump and the second separation membrane, and the other end of the second pressure control pipeline is communicated on the second water tank.

[0042] The raw water tank, the first water tank and the second water tank in the embodiment are provided with liquid level sensors and temperature sensors, so that the liquid level and temperature information of the water tanks can be fed back in real time. When the liquid level in the raw water tank is lower than the preset minimum liquid level, the first delivery pump stops running; when the liquid level in the raw water tank is higher than the preset maximum liquid level, the first booster pump stops running and alarms. When the liquid level in the first water tank is lower than the preset minimum liquid level, the first delivery pump starts running; when the liquid level in the first water tank is higher than the preset maximum liquid level, the first delivery pump stops running.

[0043] In order to further control the temperature of the liquid in the system, first and second heaters are arranged on the first and second water tanks respectively in the embodiment, for heating the water in the water tanks; first and second coolers are arranged on the first and third return pipelines respectively, for cooling, and the water temperature is maintained at the optimum temperature (28-34℃) through the cooperation of the heaters and the coolers.

[0044] The first connection pipeline is arranged between the bottom of the raw water tank and the top of the first water tank, the second connection pipeline is arranged between the bottom of the first water tank and the top of the second water tank, the first delivery pump is arranged on the first connection pipeline, the second delivery pump is arranged on the second connection pipeline, and the first and second connection pipelines are both provided with pressure gauges and flow meters.

[0045] In order to more accurately monitor the pressure and flow of the pipeline, in the embodiment, flow meters and pressure sensors are arranged on the first and third return pipelines, and flow meters are arranged on the second and fourth return pipelines. The connecting pipelines between the bottom of the first water tank and the first separation membrane and between the bottom of the second water tank and the second separation membrane are each provided with a pressure sensor and a flow meter.

[0046] At the same time, in order to facilitate sampling, in the embodiment, sampling ports are arranged on the first connecting pipeline, the second connecting pipeline, the first return pipeline, the second return pipeline, the third return pipeline, the fourth return pipeline and the like.

[0047] The entire electric control module of the similar soluble substance separation test device is used to supply power to rotating equipment (pumps) and instruments, accept signals of instruments, sensors and the like, display and record information such as flow, liquid level, temperature and the like, and control pumps, valves, heaters, coolers and the like.

[0048] Example 2: Similar soluble substance separation test

[0049] The embodiment provides a similar soluble substance separation test method using the similar soluble substance separation test device as above, comprising the following steps:

[0050] 1) Setting initial parameters

[0051] The initial parameters include the flow of the first delivery pump, the flow of the first booster pump, the flow of the second delivery pump, the flow of the second booster pump, and the minimum and maximum liquid levels of the first and second water tanks;

[0052] Specifically, according to the properties of the test separation substance, the type of the membrane and the separation efficiency, the flow of the first booster pump and the flow of the second booster pump are set; according to the flow of the two booster pumps, the flow of the first delivery pump and the flow of the second delivery pump are set. According to the flow of the first delivery pump and the first booster pump, the high and low liquid levels of the first water tank are set, and according to the flow of the second delivery pump and the second booster pump, the high and low liquid levels of the second water tank are set.

[0053] 2) Purification test

[0054] 2.1) Start the first delivery pump to fill the first water tank with water, and when the liquid level in the first water tank reaches at least 50% of the maximum liquid level, start the first booster pump to purify the water in the first water tank, and the separated first concentrated liquid returns to the first water tank, and the first treated liquid returns to the original water tank;

[0055] The separation efficiency and recovery rate of the first purification module are calculated by analyzing and processing the content of the target substance in the first concentrated liquid and the first treated liquid;

[0056] According to the results of separation efficiency and recovery rate, the parameters are adjusted, and the separation and analysis are performed again to calculate the separation efficiency and recovery rate of the first purification module to obtain the best separation effect.

[0057] and / or,

[0058] 2.2) Start the second delivery pump to fill the second water tank, and when the liquid level in the second water tank reaches at least 50% of the highest liquid level, start the second booster pump to purify the water in the second water tank, and the second concentrated liquid returns to the second water tank, and the second treatment liquid returns to the first water tank.

[0059] The content of the target substance in the third concentrated liquid and the second treatment liquid is analyzed and processed to calculate the separation efficiency and recovery rate of the second purification module and the whole.

[0060] According to the results of separation efficiency and recovery rate, the parameters are adjusted, and the separation and analysis are performed again to calculate the separation efficiency and recovery rate of the second purification module and the whole.

[0061] Specifically, the separation test method in the embodiment is divided into the following three cases during purification:

[0062] The first case: the first purification module operates alone

[0063] In this case, the second delivery pump is closed, the first delivery pump and the first booster pump are opened, and the raw water storage module and the first purification module are connected and operated.

[0064] The second case: after the first purification module operates alone, the first purification module is closed and the second purification module is opened alone.

[0065] In this case, the first purification module operates alone according to the first case, and after the separation efficiency reaches the preset target, the first purification module is closed and stopped, and the first delivery pump and the first booster pump are closed. The second delivery pump is opened, and the second booster pump is opened.

[0066] The third case: the first purification module and the second purification module are jointly operated for purification

[0067] In this case, the first delivery pump is opened, the first booster pump is opened, the second delivery pump is opened, and the second booster pump is opened.

[0068] The first purification module and the second purification module are started at the same time. The content of the target substance in the raw water tank at the beginning and after the first time is analyzed, and the separation efficiency is calculated. According to the water quantity in the raw water tank at the beginning and after the first time, the recovery rate is calculated. The flow rate and pressure of the first purification module and the second purification module are adjusted to obtain a more suitable separation efficiency and recovery rate.

[0069] The present application aims to provide a similar soluble substance separation test device and separation test method, which can be used to evaluate the separation effect of similar soluble substances in a water system and to separate similar soluble substances in the water system after the separation effect is stable. The similar soluble substance separation test device and separation test method can be used to test the separation effect of similar soluble substances, the first and second purification modules can be used independently or in combination, the separation membrane materials in the first and second purification modules can be selected flexibly, and the effluent of the first and second purification modules can be arranged flexibly according to the separation requirements.

[0070] Example 2-1 separation of similar soluble substances 1

[0071] Two similar soluble substances, boric acid with a content of 2400 mg / L (calculated based on boron) and silicon with a content of 3 mg / L (calculated based on SiO2) in raw water, are separated, and the content of silicon in the purified water is required to be less than 0.5 mg / L, and the recovery rate of boron is required to be not less than 75%.

[0072] A nanofiltration membrane with a specification of 150 Dal is selected and loaded into the first purification module. According to the first case of Example 2, the first purification module is operated independently.

[0073] The operation temperature is set to 45℃, and the operation pressure is set to 0.8 MPa. The operation results are as follows: the content of silicon in the first treated liquid is about 0.3 mg / L, the content of boric acid is about 1800-1900 mg / L, and the recovery rate of boron is 75-80%.

[0074] Example 2-2 separation of similar soluble substances 2

[0075] Two similar soluble substances, boric acid with a content of 2400 mg / L and silicon with a content of 3 mg / L in raw water, are separated, and the content of silicon in the purified water is required to be less than 0.5 mg / L, and the recovery rate of boron is required to be not less than 90%.

[0076] A nanofiltration membrane with a specification of 150 Dal is selected and loaded into the first purification module, and a nanofiltration membrane with a specification of 200 Dal is selected and loaded into the second purification module. According to the second case of Example 2, the operation is performed.

[0077] The operation temperature of the first purification module is set to 25℃, and the operation pressure is set to 0.6 MPa. The first purification module is started to operate. After a certain time, the first purification module is stopped.

[0078] The operation results are as follows: the content of silicon in the first treated liquid is about 0.5 mg / L, the content of boric acid is about 2180-2230 mg / L, and the recovery rate of boron is 90-92%.

[0079] Example 2-3 separation of similar soluble substances 3

[0080] Separate two similar soluble substances, the content of boric acid in raw water is 2400mg / L, the content of silicon is 3mg / L, the content of silicon after purification treatment is required to be less than 0.5mg / L, and the recovery rate of boron is not less than 90%.

[0081] A nanofiltration membrane with a specification of 150Dal is selected to be installed in the first purification module, and a nanofiltration membrane with a specification of 200Dal is selected to be installed in the second purification module. The operation is according to the third case of example 2.

[0082] The operation temperature of the first purification module is set to be 25℃, and the operation pressure is set to be 0.6MPa. The operation temperature of the second purification module is set to be 45℃, and the operation pressure is set to be 0.6-0.8MPa. The first purification module and the second purification module are started to operate, and then stopped after a certain time.

[0083] The operation results are as follows: the content of silicon in the first treated liquid is about 0.45-0.5mg / L, the content of boric acid is about 2180-2250mg / L, and the recovery rate of boron is 90-93%.

[0084] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable the person skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A method for separating similar soluble substances using a similar soluble substance separation test apparatus, characterized in that, Includes the following steps: 1) Set initial parameters The initial parameters include the flow rate of the first delivery pump, the flow rate and pressure of the first booster pump, the flow rate of the second delivery pump and the flow rate and pressure of the second booster pump, as well as the minimum and maximum liquid levels of the first and second water tanks. 2) Cleanup test 2.1) Start the first transfer pump to fill the first water tank. When the liquid level in the first water tank reaches at least 50% of the maximum liquid level, start the first booster pump to purify the water in the first water tank. The first concentrated liquid after separation is returned to the first water tank, and the first treated liquid is returned to the original water tank. The separation efficiency and recovery rate of the first purification module are calculated by analyzing the content of the target substance in the first concentrate and the first treatment liquid. Based on the results of separation efficiency and recovery rate, the parameters are adjusted, separation and analysis are performed again, and the separation efficiency and recovery rate of the first purification module are calculated again to achieve the best separation effect. and, 2.2) Start the second transfer pump to fill the second water tank. When the liquid level in the second water tank reaches at least 50% of the maximum liquid level, start the second booster pump to purify the water in the second water tank. The second concentrate is returned to the second water tank, and the second treated liquid is returned to the first water tank. By analyzing the content of the target substance in the second concentrate and the second treatment liquid, the separation efficiency and recovery rate of the second purification module and the whole are calculated. Based on the results of separation efficiency and recovery rate, the parameters are adjusted, separation and analysis are performed again, and the separation efficiency and recovery rate of the second purification module and the overall separation are calculated again to achieve the best separation effect. The separation test device for similar soluble substances includes a raw water storage module, a first purification module, a second purification module, and pipes connecting each module and each component within each module. The first purification module is used to draw water from the raw water storage module and purify it to form a first concentrated solution and a first treated solution. The first concentrated solution is returned to the first purification module, and the first treated solution is returned to the raw water storage module. The second purification module is used to draw water from the first purification module and purify it to form a second concentrated solution and a second treated solution. The second concentrated solution is returned to the second purification module, and the second treated solution is returned to the first purification module. The first purification module includes, in sequence, a first delivery pump, a first water tank, a first booster pump, and a first separation membrane; the second purification module includes, in sequence, a second delivery pump, a second water tank, a second booster pump, and a second separation membrane.

2. The separation test method according to claim 1, characterized in that, The first delivery pump is located between the bottom of the raw water storage module and the top of the first water tank. The first booster pump is located between the first water tank and the first separation membrane. A first return pipe is provided between the first separation membrane and the first water tank. A second return pipe is provided between the first separation membrane and the raw water storage module.

3. The separation test method according to claim 2, characterized in that, The first purification module includes a first pressure control pipe, one end of which is connected between the first booster pump and the first separation membrane, and the other end of which is connected to the first water tank.

4. The separation test method according to claim 2, characterized in that, The second delivery pump is located between the bottom of the first water tank and the top of the second water tank, the second booster pump is located between the second water tank and the second separation membrane, a third return pipe is located between the second separation membrane and the second water tank, and a fourth return pipe is located between the second separation membrane and the raw water storage module.

5. The separation test method according to claim 4, characterized in that, The second purification module includes a second pressure control pipe, one end of which is connected between the second booster pump and the second separation membrane, and the other end of which is connected to the second water tank.

6. The separation test method according to claim 4, characterized in that, The first water tank is equipped with a first heater; the first return pipe is equipped with a first cooler; the second water tank is equipped with a second heater; and the third return pipe is equipped with a second cooler.

7. The separation test method according to claim 4, characterized in that, The first separation membrane is used to separate the solution in the first water tank into the first concentrate and the first treatment solution, and the second separation membrane is used to separate the solution in the second water tank into the second concentrate and the second treatment solution.

8. The separation test method according to claim 4, characterized in that, The first separation membrane and / or the second separation membrane are reverse osmosis membranes, and the pore size of the reverse osmosis membrane is 0.6nm-2nm.

9. The separation test method according to claim 4, characterized in that, The raw water storage module includes a raw water tank, on which a first liquid level sensor and / or a first temperature sensor are installed; the first water tank is equipped with a second liquid level sensor and / or a second temperature sensor; and / or, the second water tank is equipped with a third liquid level sensor and / or a third temperature sensor.

10. The separation test method according to claim 9, characterized in that, A first connecting pipe is provided between the bottom of the raw water tank and the top of the first water tank, and the first delivery pump is provided on the first connecting pipe. A first pressure gauge and a first flow meter are provided on the first connecting pipe. A second connecting pipe is provided between the bottom of the first water tank and the top of the second water tank, and the second delivery pump is provided on the second connecting pipe. A second pressure gauge and a second flow meter are provided on the second connecting pipe.

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