JPH07185518A - Waste water monitoring system with emergency shutoff valve - Google Patents

Abstract

PURPOSE:To provide with allowance time to close a shutoff valve and to reduce the necessity of the immediate stop of a production process by performing the monitoring of water quality in one place and also increasing the allowance stored quantity of abnormal water flowing in after the detection of abnormality. CONSTITUTION:A waste water main pipe 15 is connected to a water quality monitoring tank 35 at its end, and the water quality monitoring tank 35 is connected to a waste water main pipe 27. The water quality monitoring tank 35 is provided with an emergency shutoff valve 41 for shutting off a waterway 39 for communicating the water quality monitoring tank 35 and the waste water main pipe 27 with each other. When the emergency shutoff valve 41 is closed, a storage tank 53 into which waste water flowing in the water quality monitoring tank 35 overflows from the water quality monitoring tank 35 is connected to the water quality monitoring tank 35. After the waste water flowing in the storage tank 53 is subjected to water quality adjustment, it is transferred to the water quality monitoring tank 35 through a returning pipe 63 by a waste water pump 61, which is installed in the storage tank 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage facility of a production facility, and more particularly to a storage tank provided with an emergency shutoff valve for preventing the outflow of abnormal water into a main drainage pipe. Concerning the provided drainage water quality monitoring system.

[0002]

2. Description of the Related Art The water quality standards for wastewater in production facilities are regulated by the Water Pollution Control Law, and the regulations are becoming more strict as environmental problems increase. On the other hand, under these circumstances, the quality of drainage water from production facilities, research facilities, etc. is also quite peculiar, and the amount of drainage water tends to increase. On the other hand, in the conventional drainage monitoring equipment,
Generally, a drainage monitoring system is used that closes the shutoff valve when the water quality is abnormal to prevent the outflow of abnormal water to the drainage main. In this type of wastewater monitoring system, a conventional wastewater monitoring system in which a water quality monitoring tank is provided for each of a plurality of factory buildings and the water quality is monitored by this water quality monitoring tank will be described with reference to FIGS. FIG. 5 is a system diagram of a conventional drainage monitoring system, and FIG. 6 is a plan view of a water quality monitoring tank used in the conventional drainage monitoring system.

Drainage branch pipes 3a, 3b, 3c, 3d, and 3e are provided in the respective factory buildings 1a, 1b, 1c, 1d, and 1e, and the drainage branch pipes 3a to 3e are drainage pipes in the individual factory buildings. It has been integrated. Drain branch pipes 3a-3
A cutoff valve 5 is attached to e, and the cutoff valve 5 is the drain branch pipe 3
The flow paths a to 3e are shut off. As the shutoff valve 5, a hydraulic cylinder type gate valve or an electric type gate valve is generally used. A monitoring tank 7 is connected to the downstream side of the shutoff valve 5, and the drainage water from the drain branch pipes 3a (or 3b to 3e) flows into the monitoring tank 7. As shown in FIG. 6, a water quality monitoring tank 11 and a water quality adjusting tank 13 are sectioned by a partition wall 9 in the monitoring tank 7, and the water quality monitoring tank 11 is connected to the downstream side of the shutoff valve 5. A drainage main pipe 15 is connected to the water quality monitoring tank 11, and an opening of the drainage main pipe 15 can be opened and closed by a solenoid valve 17. The water quality monitoring tank 11 and the water quality adjusting tank 13 are connected by a communication pipe 19, and the communication pipe 19 can be opened and closed by a solenoid valve 21. A drainage main pipe 15 is connected to the water quality adjusting tank 13, and an opening of the drainage main pipe 15 can be opened and closed by a solenoid valve 23. The end of the drainage main pipe 15 to which the plurality of monitoring tanks 7 are connected is a public container 25.
It is connected to the drain main 27 via (see FIG. 5).

In the conventional drainage monitoring system thus constructed, the shutoff valve 5 and the solenoid valve 17 are normally opened and the solenoid valve 21 is normally closed. When the water quality sensor 29 provided in the water quality monitoring tank 11 detects an abnormality in the water quality, the shutoff valve 5 and the solenoid valve 17 are closed to prevent the abnormal water from flowing into the drainage main pipe 15, and the shutoff valve 5 is completely closed. The wastewater until it is closed is stored in the water quality monitoring tank 11. When the shut-off valve 5 is completely closed and the drainage inflow from the drain branch pipes 3a to 3e is stopped, the electromagnetic valve 21 is opened and the abnormal water in the water quality monitoring tank 11 flows into the water quality adjusting tank 13. After the water quality of the abnormal water flowing into the water quality adjusting tank 13 is adjusted to a specified value, the electromagnetic valve 23 is opened, so that the main drain 15
It is released to.

[0005]

However, in the conventional drainage monitoring system, since the monitoring tank 7 is provided for each factory building, it is necessary to monitor each building and there is a problem that the labor is great. Further, when a hydraulic cylinder type is used as the shutoff valve 5, there is a problem that the control circuit of the hydraulic system becomes complicated and oil leakage and deterioration of oil quality easily occur and maintenance is not easy. On the other hand, shutoff valve 5
When an electric type is used as, the ascending / descending speed of the gate is slow, for example, about 300 mm / min, and it is difficult to shut off in an emergency, and the descent speed becomes slower because it is manually closed during a power failure, There is a possibility that the water storage amount in the water quality monitoring tank 11 may be insufficient. Further, since the abnormal water until the shutoff valve 5 is completely closed is stored only in the water quality monitoring tank 11, the abnormal water is stored only in the water quality monitoring tank 11 together with the above-mentioned delay of the shutoff valve ascending / descending speed. There was a problem that the water became full soon. Therefore, it is necessary to suppress the inflow amount of abnormal water together with the abnormality detection, and for that purpose, the production process must be stopped immediately to stop the outflow of the process waste water.
The present invention has been made in view of the above situation, and it is possible to monitor at one place, and by increasing the allowable storage amount of abnormal water that flows in after abnormality detection, there is a margin in the time until the shutoff valve is closed. (EN) A drainage monitoring system with an emergency shutoff valve that can be provided and does not need to stop the production process immediately, with the aim of saving labor in monitoring work and preventing production efficiency from decreasing.

[0006]

The construction of the drainage monitoring system with an emergency shutoff valve according to the present invention for achieving the above object is obtained by integrating drainage branch pipes from each factory building into one drainage main pipe. Is connected to the water quality monitoring tank, this water quality monitoring tank is connected to the drainage main, and an emergency shutoff valve for shutting off the water channel from the water quality monitoring tank to the drainage main is installed in the water quality monitoring tank, and the emergency shutoff valve is closed. The overflow pipe that overflows the drainage water from the main drainage pipe that flows into the water quality monitoring tank when connected to the water quality monitoring tank is connected to the water quality monitoring tank, and the end of the overflow pipe is connected to the water quality adjustable storage tank. It is characterized in that the storage tank is provided with a drainage pump which is connected by a return pipe and which adjusts the water quality of the wastewater flowing into the storage tank and transfers it to the water quality monitoring tank through the return pipe. In addition, the emergency shutoff valve used in the drainage monitoring system with an emergency shutoff valve has a gate plate that opens and closes the water channel to the drainage main by moving up and down, and when shutting off the water channel, the gate plate descends due to its own weight and shuts off the water channel. It is preferable that

[0007]

If the process wastewater flowing from the main drainage water into the water quality monitoring tank has an abnormal water quality, the emergency shutoff valve is closed to prevent the abnormal water from flowing into the main drainage water. By closing the emergency shutoff valve, abnormal water is transferred to the storage tank through the overflow pipe. As a result, it is possible to monitor abnormalities in process wastewater with one water quality monitoring tank, and there is a margin in time until abnormal wastewater can be stored in the storage tank before the process wastewater is stopped, and the production process is stopped. Urgency is eased. Then, when the abnormal water flowing into the storage tank via the overflow pipe is stopped, the abnormal water in the storage tank is water quality adjusted, and when the completion of the water quality adjustment is confirmed, the drainage pump adjusts the process wastewater. Is transferred to the water quality monitoring tank, at the same time, the emergency shutoff valve is opened, and the adjusted wastewater transferred to the water quality monitoring tank via the water channel is discharged to the drain main. In addition, if the gate plate is lowered by its own weight and the water channel is blocked by the structure of the emergency shutoff valve, the complicated hydraulic control circuit as in the case of the hydraulic system is not required, and the gate is compared to the electric type. The descent speed of the water will be increased, and the large diameter waterway can be closed instantly.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the drainage monitoring system with an emergency shutoff valve according to the present invention will be described in detail below with reference to the drawings. 1 is a schematic system diagram of the drainage monitoring system with an emergency shutoff valve of the present invention, FIG. 2 is a detailed view of the monitoring tank shown in FIG. 1, and FIG. 3 is a detailed view of the storage tank shown in FIG. As shown in Figure 1,
Drain branch pipe 3 in each factory building 1a, 1b, 1c, 1d, 1e
a, 3b, 3c, 3d, and 3e are provided, and the drainage branch pipes 3a to 3e are connected to the drainage main pipe 15. A monitoring tank 31 is connected to the end of the drainage main pipe 15, and the drainage water from each of the factory buildings 1a to 1e flows into the monitoring tank 31 through the drainage main pipe 15. Monitoring tank 3
The drainage main pipe 15 connected to 1 has a diameter of 800 mm, for example.
It has a large diameter of about 1000 mm. As shown in FIG. 2, the monitoring tank 31 has a water quality monitoring tank 35 provided by a partition wall 33.
And a connection tank 37 are sectioned and formed, and the connection tank 37 is a public container 25.
(See FIG. 1) via the drainage main 27.

The partition 33 has a water quality monitoring tank 35 and a connection tank 37.
A water channel 39 that communicates with the water channel 39 is provided, and the water channel 39 can be blocked by an emergency shutoff valve 41. The emergency shutoff valve 41 can open and close the water channel 39 by moving the gate plate 45 up and down by an electric motor (M) 43. In addition, the emergency shutoff valve 41 is
In an emergency, due to its own weight, the gate plate 45 descends at a speed several times faster than usual, and a large amount of running water can be blocked in a short time. The emergency shutoff valve 41 is provided with a guide rail (not shown) that slides the gate plate 45 up and down, and the guide rail can smoothly move the heavy gate plate 45 up and down. Further, wedge means (not shown) is provided between the gate plate 45 and the guide rail, and the wedge means regulates the descent of the gate plate 45 at an excessive speed when the sliding surface is abraded over time. Has an effect. Further, a clutch (not shown) is provided in the electric motor 43, and the clutch has an action of reducing the descending speed so that the large weight of the gate plate 45 does not directly act when the gate plate 45 descends. .

A control board 47 is connected to the electric motor 43 via control wiring, and the control board 47 gives an alarm according to a detection value from a water quality sensor (for example, a PH sensor) 49 installed vertically in the water quality monitoring tank 35. The alarm is issued and the electric motor 43
Drive control. An overflow pipe 51 is connected to the water quality monitoring tank 35, and the overflow pipe 51 is connected to a storage tank 53. In this embodiment, the storage tank 53 has a capacity of about 400 m ³ . As shown in FIG. 3, a water gradient portion 55 is formed on the bottom of the storage tank 53, and the water in the storage tank 53 is collected at a low position of the water gradient portion 55. In the storage tank 53, a plurality of partition walls 57 are arranged in parallel in the gradient direction of the water gradient section 55,
The partition wall 57 includes a storage tank 53 and five tanks 53a, 53b, and 53.
It is divided into c, 53d, and 53e. The respective divided tanks are communicated with each other through a communication port 59 opened at the bottom of the partition wall 57. In addition, the above-mentioned overflow pipe 5
1 is connected to the tank 53a on the high position side.

A drainage pump 61 is provided in a tank 53e on the lower side of the water gradient portion 55, and the drainage pump 61 is a storage tank 53.
The water inside can be transferred to the water quality monitoring tank 35 through the return pipe 63. A control panel 65 is connected to the drainage pump 61, and the control panel 65 can be operated to start and stop the drainage pump 61 manually. An air supply device 67 is provided in the storage tank 53, and the air supply device 67 supplies air into the tank by a blower 69 controlled by a control panel 65. Control panel 6
A water level sensor 71 vertically installed in the storage tank 53 is connected to the water tank 5, and the control panel 65 issues a high water level alarm when the water level sensor 71 detects a predetermined water level. In addition, a water quality sensor (for example, PH sensor) 7 is provided in the tank 53e.
3 is provided, and the water quality sensor 73 detects the water quality when adjusting the water quality. Monitoring tank 31, emergency shutoff valve 4
1, a drainage monitoring system with an emergency shutoff valve is configured with the overflow pipe 51, the storage tank 53, the drainage pump 61, and the return pipe 63 as main members.

The operation of the thus constructed drainage monitoring system with an emergency shutoff valve when the water quality is abnormal will be described with reference to FIG. FIG. 4 is a flowchart showing an operation procedure when the water quality is abnormal. When the process wastewater that has flowed into the water quality monitoring tank 35 from the main drainage pipe 15 is detected by the water quality sensor 49 as having an abnormal water quality, the control panel 47 issues an alarm (st. 1).
At the same time, the emergency shutoff valve 41 is rapidly closed by its own weight through the clutch (st. 3). As a result, the drain main 27
The abnormal water is blocked from flowing into the storage tank 53 through the overflow pipe 51 (st.
5). It should be noted that, in the closure other than the emergency, the electric motor 43 is driven (st. 7) and the gate plate 45 is closed via the speed reducer (st. 9).

The production process is stopped at an appropriate timing,
When the abnormal water flowing into the storage tank 53 via the overflow pipe 51 is stopped, the water quality of the abnormal water flowing into the storage tank 53 is adjusted (st. 11). For example, PH
In the case of abnormality, PH neutralization will be performed. Therefore, there is a margin in time until the process drainage is stopped by the time for storing the abnormal water in the storage tank 53. In other words, the urgency of stopping the production process will be alleviated. When the completion of the water quality adjustment is confirmed by the water quality sensor 73, the drainage pump 61 is driven, and the process wastewater after the water quality adjustment is transferred into the water quality monitoring tank 35 (s
t. 13). At the same time, the gate plate 45 of the emergency shutoff valve 41 is opened by the electric motor 43 (st. 15), and the adjusted wastewater transferred into the water quality monitoring tank 35 via the water passage 39 is connected to the connection tank 3.
7 and is discharged to the drain main 27 (st. 17)
It will be.

[0014]

As described in detail above, according to the drainage monitoring system with an emergency shutoff valve according to the present invention, an emergency shutoff is provided in which a water quality monitoring tank is provided at the end of the drainage main pipe to shut off the water channel to the drainage main. Since the valve is installed in the water quality monitoring tank, the drainage flowing into the water quality monitoring tank when the emergency shutoff valve is closed can be stored in the storage tank via the overflow pipe.
It becomes possible to monitor the water quality with one water quality monitoring tank,
It is possible to allow time to stop the process drainage, and it is not necessary to stop the production process urgently. As a result, it is possible to save the monitoring work and prevent the production efficiency from decreasing. Further, if the emergency shutoff valve can shut off the water channel by lowering the gate plate due to its own weight, it becomes possible to instantly close the large-diameter water channel with easy maintenance.

[Brief description of drawings]

FIG. 1 is a schematic system diagram of a drainage monitoring system with an emergency shutoff valve according to the present invention.

FIG. 2 is a detailed view of the monitoring tank shown in FIG.

3 is a detailed view of the storage tank shown in FIG.

FIG. 4 is a flowchart showing an operation procedure when water quality is abnormal.

FIG. 5 is a system diagram of a conventional drainage monitoring system.

FIG. 6 is a plan view of a water quality monitoring tank used in a conventional drainage monitoring system.

[Explanation of symbols]

 1a to 1e Factory building 3a to 3e Drainage branch pipe 15 Drainage main pipe 27 Drainage main pipe 35 Water quality monitoring tank 39 Water channel 41 Emergency shutoff valve 45 Gate plate 51 Overflow pipe 53 Storage tank 61 Drainage pump 63 Return pipe

Claims (2)

[Claims] 1. A drainage branch pipe from each factory building is integrated into one drainage main pipe, and the end of the drainage main pipe is connected to a water quality monitoring tank,
The water quality monitoring tank is connected to the drainage main, and an emergency shutoff valve for shutting off the water channel from the water quality monitoring tank to the drainage main is provided in the water quality monitoring tank, and when the emergency shutoff valve is closed, to the water quality monitoring tank An overflow pipe for overflowing the drainage water from the inflowing main drain pipe is connected to the water quality monitoring tank, and the end of the overflow pipe is connected to a water quality adjustable storage tank,
The storage tank is connected to the water quality monitoring tank with a return pipe, and a drainage pump is provided in the storage tank to transfer the wastewater flowing into the storage tank to the water quality monitoring tank through the return pipe after adjusting the water quality. A drainage monitoring system with an emergency shutoff valve. 2. The emergency shutoff valve has a gate plate that opens and closes a water channel to the drain main by moving up and down, and when shutting off the water channel, the gate plate descends by its own weight to shut off the water channel. The drainage monitoring system with an emergency shutoff valve according to claim 1.