JP6828082B2 - Vacuum drainage collection system and drainage collection method - Google Patents

Description

The present invention relates to a vacuum drainage collection system and a drainage collection method.

Conventionally, experimental wastewater from research institutes, universities, factories, etc. has been collected by natural flow or pumping, but if the transported liquid leaks, it will lead to groundwater pollution. Moreover, in the unlikely event that a leak occurs, it is difficult to identify the location of the leak and repair it. In recent years, the Water Pollution Control Law has been amended and issued, and prevention of groundwater pollution is becoming more and more important.

In general, it is not permissible to directly drain experimental wastewater and experimental wastewater containing harmful substances used in experiments in experimental facilities into public sewers. Experimental effluent is a liquid discharged from an experimental facility, which may be organic or inorganic, and refers to concentrated experimental effluent including the first and second washing water of laboratory equipment and containers, and is separated and collected according to strict collection rules. , Need to be disposed of by a professional processor. On the other hand, the experimental wastewater refers to the wastewater discharged from the experimental facility after the third washing water of the experimental container, the wastewater that is not the experimental wastewater, and the cooling water of the equipment, and is collected in the wastewater treatment facility on the premises and meets the water quality standard. It is necessary to process as such. The experimental wastewater treated by the wastewater treatment facility is liquefied and reused, or discharged to the public sewer.

In such experimental facilities, piping bodies, joints, flanges, valves, drainage ditches, drainage and pump equipment are used to collect experimental wastewater that requires wastewater treatment from each experimental wastewater source to the treatment equipment. Ancillary equipment for draining water containing harmful substances is provided. In these conventional ancillary facilities, experimental wastewater has been collected by natural flow or pump pumping. In order to prevent groundwater pollution in the conventional ancillary equipment of such a method, for example, the structure shown in FIG. 11 is required. When the pipe 1 is installed on the ground, it is required to be installed away from the floor surface so that leakage can be easily visually confirmed. At this time, the pipe 1 may be installed in the saucer 2 in case of leakage. Further, when it is installed underground, it is required to install the pipe 1 in the trench 3 and use a protective pipe (sheath pipe) so that the drainage does not flow directly to the underground at the time of leakage. It is also conceivable to coat the inside of the pipe or pass the pipe through the existing pipe to form a double structure. It is relatively easy to consider the above structure in advance when constructing ancillary facilities, but it is not easy to remodel the above structure in the drainage ditch that was installed underground in the past, and it is required. You may not be satisfied. In such a case, as the next best measure, visually inspect the presence or absence of abnormalities, and inspect the penetration into the underground by checking the fluctuation of the water level inside the drainage ditch, etc. at an appropriate number of times. Is required.

However, in the conventional method, among the installed pipes and the like, many cases of leakage have been seen in the past at joints such as joints and equipment such as valves. With methods such as natural flow and pump pumping, it is impossible to completely prevent leakage itself, no matter how much structural measures are taken. Therefore, it is necessary to take safety measures on the premise that there is a possibility of leakage and carry out inspections at a sufficient frequency. In addition, regarding trenches, it may not be possible to install a dedicated trench due to space restrictions on the installation location. For drainage ditches installed underground in the past that cannot be changed to a structure that can handle leaks, it is necessary to improve groundwater pollution by enhancing inspection equipment and strict inspection contents.

One embodiment of the present invention aims to provide an economical vacuum drainage collection system capable of collecting liquid without leakage. Another object of the present invention is to provide an economical drainage collection method capable of collecting a liquid without leakage. Further, in one embodiment of the present invention, even if there is a defect in the vacuum piping, the defective portion can be immediately identified, thereby minimizing the trouble of inspection for preventing groundwater pollution. It is an object of the present invention to provide a vacuum type drainage collection system capable of providing a vacuum type drainage collection system. The present invention can achieve at least one of the above objects.

According to one embodiment of the present invention, the vacuum type drainage collection system includes a plurality of liquid storage tanks for storing drainage, a water collection tank for collecting drainage in the plurality of liquid storage tanks, and the like. A vacuum station equipped with a vacuum generator that introduces negative pressure into the water collection tank, a communication passage that connects each of the plurality of liquid storage tanks to the water collection tank, and a plurality of liquid storage tanks that open and close the communication passage. A plurality of remote control valves provided corresponding to each of the above, a measuring means provided corresponding to each of the plurality of liquid storage tanks, and a plurality of remote control valves so as to measure the state of each of the plurality of liquid storage tanks. A vacuum type effluent collection system including a remote control valve control means for remotely controlling the operation of the water is provided. The remote-controlled valve control means can determine the priority of the operation order of the plurality of remote-controlled valves based on the output signal from the measuring means, and can remotely control the plurality of remote-controlled valves according to the priority. According to this configuration, the drainage passes through the continuous passage under negative pressure and is collected in the water collection tank. Therefore, unlike the above-mentioned conventional technique, the drainage can be collected without fear of leakage. Further, since all of the plurality of remote control valves are not opened at the same time, it is possible to effectively prevent the liquid from staying in the communication pipe. In addition, the entire piping of the system can be designed with the minimum diameter, and the vacuum station equipment can be designed with a small capacity to realize an economical system.

According to one embodiment of the present invention, the measuring means includes a water level gauge for continuously measuring the water level of the liquid storage tanks, which is provided corresponding to each of the plurality of liquid storage tanks, and is a remote control valve control means. Can compare the measured values of the water level gauges with each other and remotely control only the remote control valve corresponding to the liquid storage tank having the highest water level. According to this configuration, a plurality of remote control valves can be operated at appropriate timings so that the liquid storage tank, which has the highest need for drainage, is drained to the water collection tank in order.

According to one embodiment of the present invention, the remote-controlled valve control means can remotely control at least one of the plurality of remote-controlled valves without performing mutual comparison of the measured values of the water level gauges. .. According to this configuration, it is possible to quickly respond to an event that is considered to be a trouble in the system.

According to one embodiment of the present invention, the vacuum station includes a power control panel that controls the operation of the vacuum generator, and the remote control valve control means is provided on the power control panel. With this configuration, it is possible to open and close a plurality of remote control valves at an appropriate timing linked to the operation of the vacuum generator.

According to one embodiment of the present invention, there is provided a method of collecting drainage under negative pressure in a water collecting tank that communicates with each of a plurality of liquid storage tanks in which drainage is stored via a communication passage. This method corresponds to each of a plurality of liquid storage tanks based on an output signal from a measuring means provided corresponding to each of the plurality of liquid storage tanks so as to measure the state of each of the plurality of liquid storage tanks. The process includes a step of determining the priority of the operation order of the plurality of remote-controlled valves provided in the continuous passage, and a step of remotely controlling the plurality of remote-controlled valves according to the priority.

According to one embodiment of the present invention, the measuring means is a water level gauge provided in each of the plurality of liquid storage tanks, and the step of determining the priority is a step of determining the priority of the plurality of liquids based on the measured values of the water level gauges. It comprises a step of reciprocally comparing the water levels of the storage tanks, and the step of reciprocally comparing includes a step of determining the first liquid storage tank having the highest water level.

According to one embodiment of the present invention, the step of determining the first-ranked liquid storage tank is a step of determining whether or not the water level of the first-ranked liquid storage tank is equal to or lower than a predetermined valve operating minimum water level. The step of opening the remote control valve corresponding to the first-ranked liquid storage tank when the water level of the first-ranked liquid storage tank is not equal to or lower than the predetermined valve operating minimum water level is included.

According to one embodiment of the present invention, each of the plurality of liquid storage tanks is provided with a pressure gauge for measuring the pressure in the communication passage, and the method is a remote operation corresponding to the first-ranked liquid storage tank. After the step of opening the valve, the water level of the first-ranked liquid storage tank is below the predetermined value, and the measured value of the pressure gauge of the first-ranked liquid storage tank and the pressure of the gas phase part of the water collection tank A step of closing the remote control valve corresponding to the first-ranked liquid storage tank when they are close to each other over a predetermined time is provided.

According to one embodiment of the present invention, in the method, after the step of opening the remote control valve corresponding to the first-ranked liquid storage tank, the water level of the first-ranked liquid storage tank is equal to or lower than a predetermined value, and A step of closing the remote control valve corresponding to the first-ranked liquid storage tank is provided when the amount of rise in the water level of the water collecting tank reaches a predetermined value.

According to one embodiment of the present invention, in the method, after the step of opening the remote control valve corresponding to the first-ranked liquid storage tank, the water level of the first-ranked liquid storage tank is equal to or lower than a predetermined value, and A step of closing the remote control valve corresponding to the first-ranked liquid storage tank is provided after a lapse of a predetermined time.

According to one embodiment of the present invention, the method is a step of starting the operation of the vacuum generator so as to introduce a negative pressure into the water collecting tank, and when the gas phase portion of the water collecting tank reaches a predetermined pressure. In addition, there is a process of stopping the operation of the vacuum generator, a process of maintaining the stopped state of the vacuum generator when all of the plurality of remote control valves are closed, and at least one of the plurality of remote control valves. It includes a step of restarting the operation of the vacuum generator when it is in the open state.

According to one embodiment of the invention, the method comprises opening at least one of the plurality of remote controlled valves without performing a step of mutual comparison.

According to one embodiment of the present invention, the step of opening at least one remote control valve is performed when the water level of at least one of the plurality of liquid storage tanks exceeds a predetermined maximum allowable water level. Includes opening only the remote control valve corresponding to the liquid reservoir.

According to one embodiment of the present invention, in the step of opening at least one remote controlled valve, at least one of the plurality of manually operated means provided corresponding to each of the plurality of remote controlled valves was operated. It includes opening only the remote controlled valve corresponding to at least one manually operated means.

According to one embodiment of the present invention, in the step of opening at least one remote control valve, the amount of water level rise per unit time of at least one liquid storage tank among the plurality of liquid storage tanks is a predetermined maximum allowable water level rise amount. When the above is exceeded, only the remote control valve corresponding to at least one liquid storage tank is opened.

It is a figure which shows schematic the whole structure of the vacuum type drainage collection system which concerns on one Embodiment of this invention. It is a figure which shows the plane arrangement of the vacuum pipe (communication passage) in one Embodiment of this invention. It is a figure which shows the detail of the liquid storage tank in one Embodiment of this invention. It is a figure which shows the vertical cross-sectional shape of the vacuum pipe (communication passage) in one Embodiment of this invention. It is a functional block diagram of the vacuum type drainage collection system which concerns on one Embodiment of this invention. It is a flowchart which shows an example of the drainage collection method which concerns on one Embodiment of this invention. It is a flowchart which shows an example of the drainage collection method which concerns on one Embodiment of this invention. It is a flowchart which shows an example of the drainage collection method which concerns on one Embodiment of this invention. It is a flowchart which shows an example of the drainage collection method which concerns on one Embodiment of this invention. It is a flowchart which shows an example of the drainage collection method which concerns on one Embodiment of this invention. It is a flowchart which shows an example of the drainage collection method which concerns on one Embodiment of this invention. It is a flowchart which shows an example of the drainage collection method which concerns on one Embodiment of this invention. It is a figure which shows the example of the ancillary equipment piping structure for preventing leakage by the prior art.

Hereinafter, the vacuum drainage collection system according to the embodiment of the present invention will be described with reference to the accompanying drawings. In the following embodiments, a system for experimental wastewater discharged from experimental facilities installed on the premises of laboratories, universities, factories, etc. will be described in particular, but the system of the present invention is experimental wastewater. It can be widely applied to collect liquids discharged from various facilities. The target facilities (drainage sources) are not particularly limited.

[Overview of vacuum drainage collection system]
FIG. 1 shows an overall outline of the vacuum drainage collection system (hereinafter, simply system) 400 according to the embodiment of the present invention. As an example, the system 400 includes a liquid storage tank 200 installed in an opening formed on the ground surface of the site of the experimental facility 100, and a water collection tank 306 and a water collection tank in which the wastewater of the liquid storage tank 200 is collected. The vacuum station 300 is provided with a vacuum generator (for example, a vacuum pump 303) that introduces a negative pressure into the 306. The water collection tank 306 of the vacuum station 300 is connected to the wastewater treatment facility 600 via a pressure pump 304. The liquid storage tank 200 and the water collection tank 306 can communicate with each other by the communication passage 500. As shown in FIG. 1, the communication passage 500 is provided with a remote control valve 501 that opens and closes the communication passage 500. In this embodiment, the remote control valve 501 may be electrically connected to the field panel 502 (control panel).

The system 400 includes a plurality of liquid storage tanks 200, and the communication passages 500 may be arranged in a tree-like plane arrangement as shown in FIG. 2, for example. In the example of FIG. 2, the communication passage 500 includes a main pipe and a plurality of branch pipes branching from the main pipe and opening to each of the plurality of liquid storage tanks 200. Each branch pipe typically has the same diameter as the remote control valve 501 located in the corresponding liquid reservoir 200. When remote control valves 501 with different diameters are used among a plurality of liquid storage tanks 200, the diameters should be compared at the confluence and the pipe diameter downstream from the confluence should be determined according to the larger diameter. Can be done. The site board 502 can be installed for each liquid storage tank 200.

The communication passage 500 can be configured as an aerial pipe having a vertical cross-sectional shape as shown in FIG. 4 outdoors or indoors, and when piping indoors, it may be lifted to, for example, a ceiling portion in the facility. In the present embodiment, the communication pipe 500 can be provided with a ventilation pipe, which will be described later. In this case, a sufficient amount of air can be sucked into the communication pipe 500 to obtain a high flow velocity immediately after liquid suction and an air lift effect. .. Further, even when piping is performed in the above-ground portion or in the trench instead of the overhead piping, it is possible to perform piping having a vertical cross-sectional shape having a higher degree of freedom than the natural flow method. In FIG. 4, reference numeral 506 is a check valve for preventing backflow from the overhead pipe to the liquid storage tank.

As described above, in the present embodiment, for each of the plurality of liquid storage tanks 200, a field board 502 for operating ancillary equipment of the liquid storage tank 200 is installed, and each field board 502 corresponds to the liquid. It is electrically connected to the remote control valve 501 of the storage tank 200. The site board 502 is installed in the vicinity of the corresponding liquid storage tank 200. Further, the site board 502 is electrically connected to the water level gauge 206 and the pressure gauge 507, which will be described later, and the measured values of the water level gauge 206 and the pressure gauge 507 are output to the field board 502. The vacuum station 300 includes a power control panel 305, and the operation control of the vacuum pump 303 and the pressure pump 304 is performed by the power control panel 305. Further, each site board 502 is electrically connected to the power control board 305.

[About the liquid storage tank]
FIG. 3 shows the details of the liquid storage tank 200. In the illustrated example, a box-shaped culvert (in other words, an underdrain) 700 is buried in the ground, and a liquid storage tank 200 is installed inside the box-shaped culvert (in other words, an underdrain) 700. The culvert 700 is installed in case a leak occurs in the liquid storage tank 200 itself, but the culvert 700 does not necessarily have to be provided in the system 400 of the present embodiment.

A drainage pipe 102 due to natural flow from the drainage source 101 opens on the side wall of the liquid storage tank 200, and drainage flows into the liquid storage tank 200 through this opening. In the liquid storage tank 200, a suction pipe 503 having a liquid suction port that opens at a desired height from the bottom surface of the liquid storage tank 200 is arranged, and the suction pipe 503 is provided with a remote control valve 501. The suction pipe 503 is a part of the communication pipe 500. The remote-controlled valve 501 may be any valve that is electrically opened and closed by a control signal, and various valves such as an electric valve, a solenoid valve, and a diaphragm-operated valve can be used as the remote-controlled valve 501. Further, a vacuum valve may be used as the remote control valve, and the vacuum valve may be remotely controlled by controlling the opening and closing of the vacuum valve with an electric three-way valve or the like instead of the controller without power supply. The remote-controlled valve 501 is equipped with a valve sensor (not shown) capable of detecting the open / closed state of the remote-controlled valve 501. The valve sensor can output a valve open signal indicating that the remote control valve 501 is in the open state or a valve close signal indicating that the remote control valve 501 is in the closed state to the field panel 502. The diameter of the remote control valve 501 and the number of installed units for each liquid storage tank 200 are not particularly limited, and should be determined according to the target liquid quality of the drainage liquid (presence or absence of solid matter, etc.) and drainage conditions. Can be done. For example, when the drainage liquid does not contain solid matter, it is not necessary to consider the passing particle size of the solid matter, so that the diameter can be set to a relatively small size.

In the present embodiment, the communication pipe 500 further includes a ventilation pipe that can be opened and closed with respect to the atmosphere, and the ventilation pipe has an air suction port that is separate from the liquid suction port. The ventilation pipe is provided with an adjusting valve 505 for adjusting the amount of air suction from the air suction port. The adjusting valve 505 may have a structure capable of adjusting the opening degree or adjusting the opening degree and the opening time. In the present embodiment, the regulating valve 505 is an electric valve and is electrically connected to the field board 502. In another embodiment of the present invention, the regulating valve 505 does not necessarily have to be an electric valve, but may be a solenoid valve. Further, a ventilation pipe provided with a manual adjusting valve 505 capable of only adjusting the opening degree may be provided on the upstream side (liquid suction port side) of the remote control valve 501. When the amount of liquid to be sucked at one time is small, the liquid suction from the liquid storage tank 200 is completed (that is, the water level of the liquid storage tank 200 is liquid suction) without providing an air suction port separate from the liquid suction port. The remote control valve 501 may be kept open for a certain period of time (after it becomes lower than the mouth) so that air is sucked only from the liquid suction port.

In the liquid storage tank 200, a measuring means for measuring the state of the liquid storage tank 200 can be provided. In addition to the valve sensor described above, for example, a water level gauge 206 and a pressure gauge 507 can be provided as such measuring means. The water level gauge 206 can be provided to continuously measure the water level of the liquid in the liquid storage tank 200. The measured value (continuous value) of the water level gauge 206 is output to the site board 502. Further, the pressure gauge 507 is provided in the communication pipe (branch pipe) 500 in each liquid storage tank 200, and the measured value of the pressure gauge 507 is output to the site board 502.

[About the vacuum station]
The vacuum station 300 will be described again with reference to FIG. The vacuum station 300 can be installed in the vicinity of the wastewater treatment facility 600. Hereinafter, embodiments will be described with an example of using a vacuum pump 303 as the vacuum generator. The vacuum station 300 in the present embodiment includes a water collecting tank 306, a vacuum pump 303 for introducing a negative pressure into the water collecting tank 306, and a power control panel 305 for controlling the operation of the vacuum pump 303. The negative pressure from the vacuum pump 303 is introduced into the communication passage 500 via the water collecting tank 306. By opening the remote control valve 501, the liquid in the liquid storage tank 200 is sucked into the communication passage 500 through the suction pipe 503 by the difference pressure between the negative pressure in the communication passage 500 and the atmospheric pressure, and the water collection tank Can be collected at 306.

Although not shown, the water collecting tank 306 is provided with a pressure gauge for measuring the pressure of the gas phase portion of the water collecting tank 306 and a water level gauge for measuring the water level of the liquid in the water collecting tank 306. These measured values are output to the power control panel 305.

In the example of FIG. 1, a single water collecting tank 306 is shown, but in another embodiment of the present invention, two water collecting tanks 306 may be provided with one as a reserve. Further, for example, when it is necessary to separately collect the drainage for each type, two water collection tanks 306 may be provided and a switching valve may be provided at the inflow port. Further, the vacuum station may be an ejector type vacuum station that uses an ejector as a vacuum generator.

[About drainage collection method]
In the vacuum type drainage collection system 400 of the present embodiment configured as described above, the field board 502 arranged in the vicinity of each liquid storage tank 200 and the power control board 305 arranged in the vacuum station 300 are provided. They can communicate electrically with each other. FIG. 5 shows an example of a functional block diagram of the vacuum drainage collection system 400 of the present embodiment. For convenience of explanation, in FIG. 5, four liquid storage tanks 200 are shown for one vacuum station 300, but the number of liquid storage tanks 200 is not particularly limited. For example, dozens of liquid storage tanks 200 may be managed by one vacuum station 300.

Referring to FIG. 5, as described above, each liquid storage tank 200 is provided with a remote control valve 501 and a measuring means 201 for measuring the state of each liquid storage tank 200. In the present embodiment, the measuring means 201 is, for example, a valve sensor that detects the open / closed state of the remote control valve 501, a water level gauge 206 that continuously measures the water level of the liquid in the liquid storage tank 200, and a liquid storage tank 200. Includes a pressure gauge 507 provided in or near the communication pipe (branch pipe) 500. The on-site panel 502 includes a communication unit 508 capable of communicating with the power control panel 305, and the measured value by the measuring means 201 is output to the remote control valve control unit of the power control panel 305 via the communication unit 508. In particular, the continuous value of the water level gauge 206 is constantly monitored by the remote control valve control unit of the power control panel 305. Based on the measured value of the measuring means 201, the remote control valve control unit can transmit a control signal for controlling the operation of the remote control valve 501 to the communication unit 508 of the field board 502. The remote control valve 501 is electrically opened and closed by a control signal from the communication unit 508. Further, the field board 502 includes a manual operation unit 509 that can electrically open and close the remote control valve 501 without going through the power control board 305. The manual operation unit 509 may be any one that can be manually operated by a worker in the field, and may be, for example, a push button or a touch panel. When the manual operation unit 509 is operated, a control signal can be transmitted to the remote control valve 501 via the communication unit 508. Further, when the manual operation unit 509 is operated, a signal indicating that the manual operation unit 509 has been operated can be output to the power control panel 305 via the communication unit 508.

The power control panel 305 provided in the vacuum station 300 is composed of a CPU, a memory, and the like, and controls the operation of the remote control valve control unit capable of remotely controlling the operation of the remote control valve 501 and the operation of the vacuum pump 303. Includes a vacuum pump control unit that can. Although not shown, the power control panel 305 also includes a pressure feed pump control unit that controls the operation of the pressure feed pump 304 according to the water level of the water collection tank 306. As will be described later, the measured values of the pressure gauge 307 and the water level gauge 308 of the water collecting tank 306 output to the power control panel 305 can be used for the operation control of the remote control valve 501 by the remote control valve control unit.

In the vacuum drainage collection system 400 of the present embodiment, information about the states of the plurality of liquid storage tanks 200 measured by the measuring means 201 is transmitted to the remote control valve control unit of the power control panel 305 provided in the vacuum station 300. Can be collected in. As an example, in the present embodiment, the continuous value of the water level gauge 206 provided in each liquid storage tank 200 is monitored by the remote control valve control unit, and the remote control valve control unit measures the water level gauge 206 at predetermined time intervals. The values are compared with each other to determine the priority for the operation order of the plurality of remote control valves 501. By operating the plurality of remote control valves 501 according to this priority, the liquid storage tank 200 having a high priority (in other words, a high water level) does not open all of the plurality of remote control valves 501 at the same time. Liquids can be collected in order from. Further, by associating the operation of the remote control valve 501 with the operation of the vacuum pump 303, more efficient operation of the vacuum pump 303 becomes possible. In this way, the remote control valve 501 can be opened and closed at an appropriate timing in conjunction with the operation of the vacuum pump 303, so that flexible control can be performed according to the drainage conditions of various facilities such as experimental facilities. become. As an example, the vacuum drainage collection system 400 of the present embodiment can be operated as follows.

[First Embodiment (Regular Repeated Collection Mode)]
The first embodiment of the drainage collection method using the vacuum type drainage collection system 400 will be described with reference to FIG. In the first embodiment, the power control panel 305 is configured to have a timer function such as a 24-hour timer, and when the set time comes, processing by the remote control valve control unit (remote control valve control flow) and a vacuum pump. Processing by the control unit (vacuum pump control flow) is executed in parallel. For convenience of explanation, this control method is referred to as a scheduled repetitive collection mode. Hereinafter, the remote control valve control flow and the vacuum pump control flow in the scheduled repetitive collection mode will be described.

(About remote control valve control flow)
At the set time, the remote control valve control unit of the power control panel 305 mutually compares the measured values of the water level gauge 206 for all of the plurality of liquid storage tanks 200 monitored by the remote control valve control unit, and in descending order of water level. Add permutations (step 801). Next, the remote control valve control unit determines (selects) the first liquid storage tank 200 having the highest water level (step 802). After that, the remote control valve control unit sets the water level of the first-ranked liquid storage tank 200 to a predetermined water level (“the lowest water level for valve operation”) based on the measured value of the water level gauge 206 of the first-ranked liquid storage tank 200. It is determined whether or not it is (referred to as) or less (step 803). When the water level of the first-ranked liquid storage tank 200 is not lower than the minimum valve operating water level (NO), it is provided in the first-ranked liquid storage tank 200 from the remote control valve control unit via the communication unit 508 of the site board 502. A control signal is sent to the remote control valve 501. As a result, the remote control valve 501 is opened (step 804). When the water level of the first-ranked liquid storage tank 200 is equal to or lower than the valve operating minimum water level (YES), the water levels of all the plurality of liquid storage tanks 200 monitored by the remote control valve control unit are below the valve operating minimum water level. .. Therefore, the opening / closing operation of the remote control valve 501 is skipped, and the remote control valve control unit is in the standby state until the next set time.

When the remote control valve 501 of the first-ranked liquid storage tank 200 is opened in step 804, the liquid in the first-ranked liquid storage tank 200 is charged by the differential pressure between the negative pressure and the atmospheric pressure in the communication pipe 500. It is sucked from the suction pipe 503. After that, the remote control valve control unit determines whether or not the water level of the first-ranked liquid storage tank 200 is equal to or lower than the predetermined water level (LWL) based on the water level gauge 206 of the liquid storage tank 200 (step 805). ). The predetermined water level (LWL) is set to a water level lower than the minimum valve operating water level. When the water level of the liquid storage tank 200 is equal to or lower than the predetermined water level (LWL) (YES), the remote control valve control unit can close the remote control valve 501. However, in the present embodiment, following step 805, the remote control valve control unit compares the measured value of the pressure gauge 507 of the first-ranked liquid storage tank 200 with the pressure of the water collecting tank 306 (step 806). .. When the pressures of the first-ranked liquid storage tank 200 and the water collection tank 306 are close to each other for a certain period of time or longer, the remote control valve control unit closes the remote control valve 501 (step 807).

By setting the closing condition of the remote control valve 501 in this way, even after the liquid suction from the liquid storage tank 200 is completed (that is, after the water level of the liquid storage tank 200 becomes lower than the liquid suction port), The remote control valve 501 can be maintained in the open state for a certain period of time, and air can be sucked from the liquid suction port. At that time, the sucked air rapidly expands under the negative pressure in the communication pipe 500, so that the liquid is surely conveyed to the water collecting tank 306. In the present embodiment, the adjusting valve (electric valve in the present embodiment) 505 is opened and closed at the same time as the remote control valve 501 is opened and closed so as to obtain a sufficient flow velocity in the communication pipe 500.

Air may be sucked from the liquid suction port in a short time (for example, several tens of seconds) after the remote control valve 501 is opened.

As described above, in the present embodiment, regarding the condition for closing the remote control valve 501, the water level of the first-ranked liquid storage tank 200 is equal to or lower than the predetermined water level (LWL), and the first-ranked liquid storage tank 200 The remote control valve 501 can be set to close when the pressure of the water collection tank 306 is close to that of the water collection tank 306 for a certain period of time or longer. When air is sucked from the liquid suction port, the degree of vacuum in the communication pipe 500 changes every moment according to the air volume of the vacuum pump and the amount of suction air, but it gradually balances and converges to a constant degree of vacuum. I will go. Based on the signals of the pressure gauges installed in the first-ranked liquid storage tank 200 and the water collection tank 306, the vacuum degrees of the liquid storage tank 200 and the water collection tank 306 are compared, and the pressures of both are constant. The remote control valve 501 can be closed when the pressure in the system 400 is almost equalized after approximately time. By equalizing the pressures of the liquid storage tank 200 and the water collection tank 306, all the sucked liquid has reached the water collection tank 306, that is, there is substantially no liquid in the communication pipe 500. It is confirmed.

By this series of operations, the liquid sucked from the remote control valve 501 into the communication pipe 500 is surely conveyed to the water collecting tank 306 at once by the air sucked thereafter, and then the remote control valve 501 is closed. Become. Therefore, the remote control valve 501 can be closed in the absence of liquid in the communication pipe 500. Thereby, when the vacuum pump 303 is started, the water collecting tank 306 and the communication passage 500 can be easily maintained at a high degree of vacuum over the entire volume.

Not limited to the above example, for example, it can be remotely determined that the water level of the first-ranked liquid storage tank 200 is equal to or lower than the predetermined water level (LWL) and a predetermined time has elapsed since the remote control valve 501 was opened. It may be a closing condition of the operation valve 501. Alternatively, the water level of the first-ranked liquid storage tank 200 is below the predetermined water level (LWL), and the amount of increase in the water level gauge 308 of the water collection tank 306 after the remote control valve 501 is opened is equal to or higher than a certain value. It is also possible to set the closing condition of the remote control valve 501. Even in these cases, the remote control valve 501 can be maintained in the open state for a certain period of time after the liquid suction is completed, and air can be sucked from the liquid suction port.

At the same time as closing the remote control valve 501, the adjustment valve 505 of the ventilation pipe (the electric valve in this embodiment) is closed.

When step 807 is completed, the remote control valve control unit returns to step 801. At this time, since the water level of the liquid storage tank 200 selected as the first place is equal to or lower than the predetermined water level (LWL), in step 802, the remote control valve control unit is the liquid storage tank having the second highest water level. 200 is selected as the first liquid storage tank 200. Then, the remote control valve 501 of the liquid storage tank 200 is opened and closed in the same manner. By repeating this opening / closing operation, all of the liquid storage tanks 200, from the liquid storage tank 200 having the highest water level to the liquid storage tank 200 having the lowest water level, are sequentially selected one by one according to the permutation of the water level. As a result, drainage is collected in the vacuum station 300 for each liquid storage tank 200.

Even if the water level rises due to a sudden inflow in the liquid storage tank 200 that has been drained once during this repetition, it is always sucked again if the permutation is raised when the water level is compared.

Further, as described above, when the water level of the first-ranked liquid storage tank 200 does not reach the minimum valve operating water level, the remote-controlled valve control unit skips the opening / closing operation of the remote-controlled valve 501 and sets the following. It will be in a standby state until the time.

The liquid collected in the water collection tank 306 can be pumped to the adjacent wastewater treatment facility 600 in the shortest distance by the pressure pump 304 controlled based on the measured value of the water level gauge of the water collection tank 306.

The capacity of the liquid storage tank 200 can be determined in relation to the operation interval (standby time) of the system 400. For example, when the operation interval is set to 1 hour, the capacity of the liquid storage tank 200 can be determined based on the maximum displacement of the drainage source per hour and the safety factor. Therefore, when the operation interval of the system 400 is set long, the capacity of the liquid storage tank 200 can be increased, and when the operation interval of the system 400 is set short, the capacity of the liquid storage tank 200 can be decreased. As an example, the capacity of the liquid storage tank 200 can be designed to be about 50 liters. Further, when a plurality of liquid storage tanks 200 are connected to the system 400, the capacities of all the liquid storage tanks 200 are not necessarily the same, and the capacities are adjusted according to the scale of the drainage source connected to each liquid storage tank 200. You may design.

(Vacuum pump control flow)
When the set time arrives, the vacuum pump control unit determines whether the start condition of the vacuum pump 303 is satisfied (presence or absence of failure, etc.) (step 901). When the vacuum pump 303 satisfies the start condition, the vacuum pump control unit proceeds to step 902 and starts the operation of the vacuum pump 303 so as to bring the inside of the water collecting tank 306 and the communication passage 500 into a desired vacuum state. Then, the vacuum pump control unit determines whether or not the water collecting tank 306 is in the vacuum pump stop vacuum degree (step 903). Specifically, in step 903, it is determined whether or not the measured value of the pressure gauge 307 is lower than the predetermined pressure required to collect the drainage (step 903). When the water collection tank 306 is in the vacuum pump stop vacuum degree (YES), the operation of the vacuum pump 303 is stopped in step 904. At this time, since there is no liquid in the connecting passage 500, the water collecting tank 306 and the connecting passage 500 can be easily maintained at a high degree of vacuum over the entire volume. The degree of vacuum at which the vacuum pump is stopped can be appropriately set according to the diameter of the communication pipe 500, the pipe length, and the vertical cross-sectional shape. For example, when the diameter of the communication pipe 500 is small and the pipe length is short, the pipe capacity of the system 400 is small, or when the lift in the vertical cross-sectional shape is small, the operation may be performed at a low degree of vacuum. Therefore, in this case, the vacuum pump stop vacuum degree can be set low.

When the vacuum pump 303 is stopped in the state where the desired vacuum state is formed in this way, the vacuum pump control unit determines whether or not the remote control valve control flow is at the end (in other words, the remote control valve control unit is in the standby state). Whether or not there is) is determined (step 905). This determination can be made, for example, based on the determination result in step 803 of the remote control valve control flow. Alternatively, based on the valve open signal or valve close signal of the valve sensor, it is determined that the remote control valve control flow is the end by holding the state in which all the remote control valves 501 are closed for a certain period of time or longer. You may. When the remote control valve control flow is at the end (YES), the vacuum pump control unit is in the standby state. When the remote control valve control flow is not at the end (NO), the vacuum pump control unit determines whether or not the water collection tank 306 is at the vacuum pump starting vacuum degree (step 906). Specifically, in step 906, it is determined whether or not the measured value of the pressure gauge 307 is a pressure higher than a predetermined pressure that requires the operation of the vacuum pump 303. When the water collecting tank 306 is at the vacuum pump starting vacuum degree (YES), the operation of the vacuum pump 303 is restarted. When the water collecting tank 306 is not in the vacuum pump starting vacuum degree (in other words, when the vacuum degree of the water collecting tank 306 is sufficiently high) (NO), the vacuum pump control unit maintains the stopped state of the vacuum pump 303. .. Then, again, in step 905, it is determined whether or not the remote control valve control flow is the end.

According to another embodiment of the present invention, the series of operations does not necessarily have to be started at predetermined time intervals. For example, a predetermined threshold value may be set for the water level of the liquid storage tank 200, and when the water level of any of the liquid storage tanks 200 reaches the threshold value, a series of operations may be automatically started. ..

In the first embodiment, the remote control valve control unit determines the priority of the operation order of the plurality of remote control valves 501 by comparing the measured values of the water level gauge 206 at predetermined time intervals, and a plurality of remote control valves according to the priority. Remotely control the remote control valve 501 of. However, in another embodiment of the present invention, an abnormal value that can be determined to cause an operation trouble is set for the water level and pressure in the liquid storage tank 200, and when the abnormal value is detected, the liquid indicating the abnormal value is set. It is also possible to operate only the remote control valve 501 corresponding to the storage tank 200. In this case, the remote control valve control unit does not perform mutual comparison of the measured values of the water level gauge 206. In the second embodiment described below, for example, when the water level of any of the plurality of liquid storage tanks 200 reaches the overflow dangerous water level for some reason, the drainage collection can be performed only for the liquid storage tank 200. it can. For convenience of explanation, this control method is referred to as a high water level collection mode.

[Second embodiment (collection mode at high water level)]
In the second embodiment, the maximum allowable water level for each liquid storage tank 200 is set as an abnormal value. The measured value of the water level gauge 206 of each liquid storage tank 200 is transmitted to the power control panel 305 via each site panel 502, and when this measured value reaches an abnormal value, the remote control valve control unit raises the high water level. When drainage collection in the collection mode is started. Hereinafter, the high water level collection mode will be described with reference to FIG. 7.

(About remote control valve control flow)
When the remote control valve control unit detects that the measured value of the water level gauge 206 of any of the liquid storage tanks 200 has reached an abnormal value, that is, a predetermined maximum allowable water level, the remote control valve 501 of the liquid storage tank 200 Open (step 804). After that, it is determined whether or not the water level of the liquid storage tank 200 is equal to or lower than the predetermined water level (LWL) (step 805). When the water level of the liquid storage tank 200 becomes LWL or lower, the remote control valve control unit may close the remote control valve 501. However, as in the first embodiment, the measured value of the pressure gauge 507 of the liquid storage tank 200 and the pressure of the water collecting tank 306 may be compared (step 806). In this case, when the pressures of the liquid storage tank 200 and the water collection tank 306 are close to each other for a certain period of time or longer, the remote control valve control unit closes the remote control valve 501 (step 807). As in the first embodiment, the closing condition of the remote control valve 501 is not limited to the above example. For example, the closing condition of the remote controlled valve 501 may be that the water level of the liquid storage tank 200 is equal to or lower than the predetermined water level (LWL) and a predetermined time has elapsed since the remote controlled valve 501 was opened. Alternatively, it is remotely controlled that the water level of the liquid storage tank 200 is equal to or lower than the predetermined water level (LWL) and the amount of increase in the water level of the water collecting tank 306 after the remote control valve 501 is opened is equal to or higher than a certain value. It is also possible to set the closing condition of the valve 501.

(Vacuum pump control flow)
When the vacuum pump control unit detects that the measured value of the water level gauge 206 of any of the liquid storage tanks 200 has reached an abnormal value, that is, a predetermined maximum allowable water level, is the start condition of the vacuum pump 303 satisfied? (Presence or absence of failure, etc.) is determined (step 901). When the vacuum pump 303 satisfies the start condition, the vacuum pump control unit proceeds to step 902 and starts the operation of the vacuum pump 303 so as to bring the inside of the water collecting tank 306 and the communication passage 500 into a desired vacuum state. Then, it is determined whether or not the water collecting tank 306 is in the vacuum pump stop vacuum degree (step 903). When the water collection tank 306 is in the vacuum pump stop vacuum degree (YES), the vacuum pump 303 is stopped in step 904.

When the vacuum pump 303 is stopped in the state where the desired vacuum state is formed in this way, the vacuum pump control unit determines whether or not the remote control valve control flow is at the end (in other words, the remote control valve control unit is in the standby state). Whether or not there is) is determined (step 905). This determination can be made based on, for example, a valve open signal or a valve close signal of the valve sensor. In this case, the remote control valve 501 is kept in a closed state for a certain period of time or longer, so that the remote control can be performed remotely. It may be determined that the valve control flow is at the end. When the remote control valve control flow is at the end (YES), the vacuum pump control unit is in the standby state. When the remote control valve control flow is not at the end (NO), the vacuum pump control unit determines whether or not the water collection tank 306 is at the vacuum pump starting vacuum degree (step 906). When the water collecting tank 306 is at the vacuum pump starting vacuum degree, the operation of the vacuum pump 303 is restarted. When the water collecting tank 306 is not in the vacuum pump starting vacuum degree (in other words, when the vacuum degree of the water collecting tank 306 is sufficient) (NO), the vacuum pump control unit maintains the stopped state of the vacuum pump 303. Then, again, it is determined whether or not the remote control valve control flow is the end.

[Third embodiment (collection mode during manual operation)]
Further, in the third embodiment, even if the remote control valve control flow and the vacuum pump control flow are started when the manual operation unit is operated so as to open the remote control valve 501 of any of the liquid storage tanks 200. Good. The control method in this case is referred to as a manual operation collection mode and is shown in FIG. In the third embodiment, the remote control valve control flow and the vacuum pump control flow are substantially the same as those described in the second embodiment, except that the start condition is that the manual operation unit 509 is operated. Is. When the manual operation unit 509 is operated, a signal indicating that the manual operation unit 509 has been operated is output to the power control panel 305, and is detected by the vacuum pump control unit and the remote control valve control unit. Similar to the second embodiment, the remote control valve control unit does not compare the measured values of the water level gauge 206 with each other. Further, unlike the first and second embodiments, the remote control valve 501 is opened by the manual operation unit 509, so that the remote control valve control unit detects a signal indicating that the manual operation unit 509 has been operated. , It is determined whether or not the water level of the liquid storage tank 200 is equal to or lower than the predetermined water level (LWL) (step 805). When the water level of the liquid storage tank 200 becomes LWL or lower, the remote control valve control unit may close the remote control valve 501, but compares the measured value of the pressure gauge 507 of the liquid storage tank 200 with the pressure of the water collection tank 306. May be (step 806). In this case, when the pressures of the liquid storage tank 200 and the water collection tank 306 are close to each other for a certain period of time or longer, the remote control valve control unit closes the remote control valve 501 (step 807). As in the first and second embodiments, the closing condition of the remote control valve 501 is not limited to the above example. For example, the closing condition of the remote controlled valve 501 may be that the water level of the liquid storage tank 200 is equal to or lower than the predetermined water level (LWL) and a predetermined time has elapsed since the remote controlled valve 501 was opened. Alternatively, the water level of the liquid storage tank 200 is equal to or lower than the predetermined water level (LWL), and the amount of increase of the water level gauge 308 of the water collecting tank 306 after the remote control valve 501 is opened is equal to or higher than a certain value. It is also possible to set the condition for closing the remote control valve 501.

When the remote control valve 501 is operated by the manual operation unit 509, it is preferable that the remote control valve 501 cannot be manually operated by a plurality of field boards 502 at the same time. Specifically, it is preferable that an interlock state in which the manual operation unit 509 of the priority site board 502 is not operated when the manual operation unit 509 of the priority site board 502 is operated can be set. For example, there is a case where it is desired to permit the outflow of harmful wastewater for each wastewater source 101 due to the circumstances of the wastewater treatment facility 600, and in such a case, by controlling the priority site board 502 in the operation of the manager side. , It is possible to control the outflow situation of harmful substances more strictly.

[Fourth Embodiment (collection mode at the time of excessive inflow)]
In the fourth embodiment, the remote control valve control unit has a function of calculating the amount of water level rise per unit time of each liquid storage tank 200 based on the measured value of the water level gauge 206 of the liquid storage tank 200. .. The amount of water level rise per unit time of the liquid storage tank 200 is (WL2-WL1) / (WL2-WL1) using the water level WL1 at time T1 and the water level WL2 at time T2 after a predetermined time interval from time T1.
It is calculated by T2-T1). In the remote control valve control unit, this calculation is performed for each liquid storage tank 200 at predetermined time intervals, and when the calculation result becomes a large value, it indicates that the water level has increased significantly in a short time. In the liquid storage tank 200 designed to have a minimum capacity, if more than the maximum amount of drainage that is the basis of the design continuously flows in from the experimental facility, etc., the drainage collection by the vacuum station cannot be completed in time and the liquid from the liquid storage tank. May overflow. Therefore, in the fourth embodiment, the allowable water level rise amount for each liquid storage tank 200 is set as an abnormal value. The measured value of the water level gauge 206 of each liquid storage tank 200 is transmitted to the power control panel 305 via each site panel 502, and the water level rise amount calculated by the remote control valve control unit based on this measured value. When the value reaches an abnormal value, the remote control valve control flow and the vacuum pump control flow are started. For convenience of explanation, this control method is referred to as an excessive inflow collection mode. Hereinafter, the collection mode at the time of excessive inflow will be described with reference to FIG.

In the fourth embodiment, the remote control valve control flow and the vacuum pump control flow are set on the condition that the water level rise amount calculated for each unit time for each liquid storage tank 200 reaches an abnormal value, that is, an excessive inflow. It is substantially the same as that described in the second embodiment, except that it does. Similar to the second embodiment, the remote control valve control unit does not compare the measured values of the water level gauge 206 with each other. For example, when the water level rise amount of any of the plurality of liquid storage tanks 200 reaches an abnormal value for some reason, the remote control valve control unit opens the remote control valve 501 of the liquid storage tank 200 (step 804). .. After that, when the water level of the liquid storage tank 200 becomes LWL or less, the remote control valve control unit may close the remote control valve 501, but the measured value of the pressure gauge 507 of the liquid storage tank 200 and the pressure of the water collection tank 306 are measured. Comparisons may be made (step 806). In this case, when the pressures of the liquid storage tank 200 and the water collection tank 306 are close to each other for a certain period of time or longer, the remote control valve control unit closes the remote control valve 501 (step 807). As in the first, second and third embodiments, the closing condition of the remote control valve 501 is not limited to the above example. For example, the closing condition of the remote controlled valve 501 may be that the water level of the liquid storage tank 200 is equal to or lower than the predetermined water level (LWL) and a predetermined time has elapsed since the remote controlled valve 501 was opened. Alternatively, the water level of the liquid storage tank 200 is equal to or lower than the predetermined water level (LWL), and the amount of increase of the water level gauge 308 of the water collecting tank 306 after the remote control valve 501 is opened is equal to or higher than a certain value. It is also possible to set the condition for closing the remote control valve 501.

As described above, according to the embodiment of the present invention, it is possible to avoid sucking the liquid from all of the plurality of remote control valves 501 at the same time. For example, the drainage is sucked into each liquid storage tank 200 according to the order of the water level and transported to the water collection tank 306, so that the liquid is effectively prevented from staying in the middle of the vacuum tube (communication passage 500). be able to. Further, the diameter of the vacuum tube does not need to be determined in consideration of the maximum amount of drainage per hour in the entire collection area, and all the lines can be designed with the minimum diameter. Further, the capacity of the vacuum pump 303 installed in the vacuum station 300 does not need to be determined in consideration of the maximum displacement per hour of the entire collection area, and the maximum capacity and gas-liquid ratio (intake air amount) of each liquid storage tank 200 are not required. It can be designed with the minimum volume in consideration of the volume ratio of the inhaled liquid to. When it is necessary to open a plurality of remote control valves 501 at the same time due to the convenience of the experimental facility 100, etc., the minimum number of simultaneous openings is taken into consideration in the design conditions, and the vacuum piping and vacuum station 300 are on a scale that allows for that amount. Specifications can be determined. In addition, by comparing the water level of the liquid storage tank with the highest priority with a predetermined threshold value (minimum water level for valve operation), the remote control valve is opened only for the liquid storage tank in which the liquid needs to be collected to drain the liquid. collect. Therefore, the drainage collection step can be performed more efficiently.

If it is necessary to collect different types of drainage and it is desired to separate and collect them, the remote control valve 501 that operates for each liquid type when setting the time schedule for the opening time of the remote control valve 501 Separate collection is possible by opening and closing the groups. In this case, it is also effective to combine it with a method of using two pipes according to the grouping and a method of installing two water collecting tanks 306 in the vacuum station 300 and installing a switching valve at the inflow port.

Further, according to the embodiment of the present invention, a defect in the vacuum pipe (communication pipe 500) can be easily found. Since the pressure inside the vacuum pipe is negative, even if there is a problem (damage, etc.) in the pipe, the drainage will not leak to the outside, but air will be sucked in from the damaged part. In this case, even if the vacuum pump 303 is operated, a desired degree of vacuum cannot be obtained, or the vacuum pump 303 operates for an excessively long time. Alternatively, there is a problem that the degree of vacuum of the communication passage 500 gradually decreases during the standby time when the remote control valve 501 does not open. By issuing an alarm when such an operating condition is detected, it is possible to immediately grasp the damage of the communication passage 500.

Further, according to the embodiment of the present invention, since the remote control valve 501 is opened and closed at different timings for each liquid storage tank 200, it is possible to promptly identify the drainage source when an abnormality in the water quality of the drainage is detected. It is possible. For example, the liquid storage tank 200 or the vacuum station 300 is equipped with a sensor for water quality or harmful gas (for example, a pH meter or a harmful gas detector), and when the sensor measures an abnormal value, the system 400 is stopped and the problem location is determined. You can take a monitoring method to report. As a result, even if a high-concentration wastewater is accidentally flowed into the system 400 from the experimental facility 100 or the like, the wastewater source may be quickly identified and the wastewater of the specified value or more may flow out of the system from the wastewater treatment facility 600. Can be eliminated. Further, even when a harmful gas is erroneously generated due to a mixture of a plurality of discharged liquids, the source can be quickly identified.

The drainage collection method according to the above embodiment can be carried out in combination. FIG. 10
Is an example in which the scheduled repetitive collection mode of the first embodiment is set as a normal operation method and can be switched to the high water level collection mode of the second embodiment. FIG. 11 is an example in which the scheduled repetitive collection mode of the first embodiment is set as a normal operation method and can be switched to the manual operation collection mode of the third embodiment. In FIG. 12, the scheduled repetitive collection mode of the first embodiment is set as a normal operation method, and the high water level collection mode of the second embodiment and the excessive inflow collection mode of the fourth embodiment can be switched. This is an example. In this case, in the case of excessive inflow, the inflow tendency can be grasped before reaching the high water level and the collection can be started in advance, so that the drainage can be collected without the risk of overflow of the liquid storage tank.

In addition, the above four embodiments can be switched between each other.

The present invention can be widely applied as a vacuum drainage collection system and a drainage collection method for collecting liquids discharged from various facilities.

1 Piping 2 Reservoir 3 Trench 100 Experimental facility 101 Drainage source 102 Drainage pipe 200 Liquid storage tank 201 Measuring means 206 Water level gauge 300 Vacuum station 303 Vacuum pump 304 Pumping pump 305 Power control panel 306 Water collecting tank 307 Pressure gauge 308 Water level gauge 400 Vacuum Type drainage collection system 500 Continuous passage 501 Remote operation valve 502 Site board 503 Suction pipe 505 Adjustment valve 506 Check valve 507 Pressure gauge 508 Communication unit 509 Manual operation unit 600 Wastewater treatment equipment 700 Calvert

Claims (11)

A water collecting tank that communicates with each of a plurality of liquid storage tanks in which drainage is stored via a communication passage is provided via a plurality of remote control valves provided in the communication passage corresponding to the plurality of liquid storage tanks. This is a method of collecting the drainage under negative pressure.
The remote control valve to be opened out of the front Symbol plural remote control valve, and specifying, based on the plurality of water level in the storage tank,
A step of electrically opening the specified remote control valve by a control signal from the remote control valve control means, and
Method based on the water level of the storage tank, by the control signal, and a step of electrically closing the opened remotely operated valve corresponding to open the remotely operated valve. The method according to claim 1 .
In the specifying step, the water levels of the plurality of liquid storage tanks are compared with each other, and the remote control valve corresponding to the first liquid storage tank having the highest water level is specified as the remote control valve to be opened. Including, method. The method according to claim 2 .
In the opening step, it is determined whether or not the water level of the first-ranked liquid storage tank is equal to or lower than the predetermined valve operating minimum water level, and the water level of the first-ranked liquid storage tank is equal to or lower than the predetermined valve operating minimum water level. A method comprising the step of opening the remote control valve corresponding to the first-ranked liquid storage tank when not. The method according to claim 1 .
The specifying step includes a step of specifying a remote-controlled valve corresponding to a liquid storage tank whose water level exceeds a predetermined maximum allowable water level as the remote-controlled valve to be opened. The method according to claim 1 .
In the specific step, the amount of water level rise per unit time is calculated for each of the plurality of liquid storage tanks, and the liquid storage tank in which the amount of water level rise per unit time exceeds a predetermined maximum allowable water level rise amount. A method comprising identifying the corresponding remote controlled valve as the remote controlled valve to be opened. The method according to any one of claims 1 to 5.
The closing step is opened when the water level of the liquid storage tank corresponding to the opened remote control valve is equal to or lower than a predetermined value and the amount of increase in the water level of the water collecting tank reaches a predetermined value. A method comprising the step of closing a remote controlled valve. The method according to any one of claims 1 to 5.
The closing step comprises a step of closing the opened remote controlled valve when the water level of the liquid storage tank corresponding to the opened remote controlled valve is equal to or lower than a predetermined value and a predetermined time elapses. A water collecting tank that communicates with each of a plurality of liquid storage tanks in which drainage is stored via a communication passage is provided via a plurality of remote control valves provided in the communication passage corresponding to the plurality of liquid storage tanks. This is a method of collecting the drainage under negative pressure.
When at least one of the plurality of manual operation means provided corresponding to the plurality of remote control valves is operated, the remote control valve corresponding to the at least one manual operation means is opened. The process of identifying as a remote control valve to be
A step of electrically opening the specified remote control valve by a control signal from the remote control valve control means, and
Method based on the water level of the liquid storage tank which corresponds to the opened said remote control valve, the open remotely operated valve, and a step of electrically closed by a control signal from the remote control valve control means .. The method according to claim 8.
The closing step is opened when the water level of the liquid storage tank corresponding to the opened remote control valve is equal to or lower than a predetermined value and the amount of increase in the water level of the water collecting tank reaches a predetermined value. A method comprising the step of closing a remote controlled valve. The method according to claim 8.
The closing step comprises a step of closing the opened remote controlled valve when the water level of the liquid storage tank corresponding to the opened remote controlled valve is equal to or lower than a predetermined value and a predetermined time elapses. The method according to any one of claims 1 to 10 .
The process of starting the operation of the vacuum generator so as to introduce a negative pressure into the water collecting tank, and
A step of stopping the operation of the vacuum generator when the gas phase portion of the water collecting tank reaches a predetermined pressure, and
A step of maintaining the stopped state of the vacuum generator when all of the plurality of remote control valves are in the closed state, and
A method comprising a step of resuming operation of the vacuum generator when at least one of the plurality of remote controlled valves is in the open state.

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