JP2000180434A - Chemical substance outflow monitoring apparatus and chemical substance outflow prevention system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chemical substance outflow monitoring apparatus for monitoring the mixing a chemical substance from an area handling the chemical substance and a chemical substance outflow prevention system for preventing the outflow of the chemical substance which achieves excellent safety with easier execution of work. SOLUTION: A chemical substance outflow monitoring apparatus 5 collects drain from an area A handling a chemical substance to be received once from an inlet part 11a and performs a monitoring to determine whether a certain kind of chemical substance is contained or not in a drain flowing into a drain pit 1 to be discharged from an outlet part 11b. The monitoring apparatus comprises a sensor part 6 which is arranged at the drain pit 1 to detect the nature of the drain, a judging part of a control part 8 to judge the mixing of the chemical substance into water by comparing the results of the measurement with the sensor part 6 and preset detection conditions and a mixing notify part 72 to notify the mixing of the chemical substance based on the judgment of the judgment part. The sensor part 6 is provided with respective sensors 61 and 62 to measure at least the electrical conductivity and refractive index of the drain.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical substance spill monitoring device and a chemical substance spill prevention system, and more particularly, collects waste water from an area where chemical substances are handled, temporarily receives the waste water from an inlet, and discharges the waste water from an outlet. The present invention relates to a chemical substance outflow monitoring device and a chemical substance outflow prevention system for monitoring whether or not a certain kind of chemical substance relating to environmental pollution is contained in wastewater flowing into a drainage pit and preventing the outflow.

[0002]

2. Description of the Related Art In areas handling a variety of chemical substances such as poisonous substances, for example, chemical plants, chemical distribution centers, storage facilities, etc., the transport of chemical substances by lorries and the like. There is a danger that chemical substances may leak inside the area and flow out of the area due to accidents at the time of outgoing, damage or deterioration of piping, troubles during work such as construction, and the like. In the unlikely event of spillage outside the area, the surrounding area could be seriously affected by environmental pollution.

[0003] The present invention has been made in view of the above problems, and an object of the present invention is to monitor mixing of a chemical substance from an area where chemical substances are handled, which is easy to carry out and has excellent safety. An object of the present invention is to provide a chemical substance outflow monitoring device and a chemical substance outflow prevention system for preventing chemical substance outflow.

[0004]

SUMMARY OF THE INVENTION According to the present invention, wastewater from an area handling chemical substances is collected, temporarily received from an inlet part, and contains certain chemical substances in wastewater flowing into a drainage pit discharged from an outlet part. A device that monitors whether or not water is drained.The sensor is installed in a drainage pit and detects the properties of drainage.During drainage, the measurement result of the sensor is compared with a preset set detection condition. A determination unit for determining the mixing of the chemical substance into the mixture, and a mixing notification unit for notifying the mixing of the chemical substance based on the determination of the determination unit, and the sensor unit measures at least the conductivity and the refractive index of the wastewater. Provided is a chemical effluent monitoring device comprising the respective sensors.

That is, according to the present invention, since a drain pit for collecting waste water from an area where chemical substances are handled is provided with respective sensors for measuring the conductivity and the refractive index of the waste water, a simple device configuration is required. A type of chemical substance can be detected, and a chemical substance can be specified or estimated by combining the measurement results of the sensor units. Therefore, it is possible to more reliably prevent the wastewater containing the chemical substance from accidentally flowing out of the area from the area where the chemical substance is handled.

The chemical substance in the present invention refers to a substance which may cause environmental pollution such as water pollution, soil pollution or air pollution. The setting detection conditions of the chemical substance in the present invention include those that comply with the environmental standards set for the wastewater by local governments and the like, and voluntary regulation values that are uniquely set by the person who handles the chemical substance.

[0007] It is preferable from a safety standpoint that the judging unit judges, when the measurement result of at least one of the conductivity sensor and the refractive index sensor meets the set detection condition, the mixing of the chemical substance into the wastewater. In the present invention, the conductivity sensor is a sensor for detecting a chemical substance dissolved in water by measuring the amount of ions dissolved in wastewater. In the present invention, the refractive index sensor is a sensor for detecting the presence of a chemical substance dissolved in wastewater by measuring the refractive index of the wastewater.

If the sensor section further includes a pH sensor for measuring the pH of the wastewater, the types of detectable chemical substances increase, and the identification or estimation of the chemical substances becomes easy. In the present invention, the pH sensor is a sensor that detects contamination of a chemical substance by measuring the hydrogen ion concentration of a liquid. The conductivity sensor and the refractive index sensor or the pH sensor are arranged so as to be able to measure a chemical substance mixed in rainwater or cooling water, that is, a chemical substance diluted with rainwater or cooling water flowing into a drain pit. It is preferable to be able to measure even when a chemical substance flows into a drain pit where rainwater or cooling water is not stored in a state of a stock solution. The determination unit is configured to compare the measurement result in the sensor unit with each set detection condition from a stock solution of a certain chemical substance to a state diluted with water to a predetermined magnification to determine the mixing of the chemical substance, Not affected by dilution by rainwater.

[0009] When the determination section determines that the chemical substance has been mixed, it is preferable that the mixed chemical substance can be estimated by using the measurement results of the sensor section complementarily. If the sensor unit is provided with a sampling tank for arranging each sensor in a measurable manner, and a drainage pump for supplying drainage from a drainage pit to the sampling tank, protection of the sensor and selection of a drainage collection position can be performed. A drainage collection pump is arranged in the flow path of the drainage pit, and is disposed near the opening on the upstream side of the baffle body that closes the upper part of the flow path and opens the lower part as an opening so as to temporarily settle the flow of drainage. Thus, the wastewater mixed with the chemical substance can be properly collected without being affected by the specific gravity of the chemical substance contained in the wastewater.

According to another aspect of the present invention, there is provided a drainage pit having an inlet and an outlet for wastewater, for collecting and receiving wastewater from an area handling chemical substances, and having at least conductivity and refractive index of the wastewater. A sensor unit provided with each sensor for measuring the temperature, a judgment unit for comparing the measurement result of the sensor unit with a preset detection condition, and judging the mixing of a chemical substance into the wastewater, and a judgment by the judgment unit. A mixing notification unit for notifying the mixing of chemical substances based on the information, a flow path closing means that is openably and closably disposed on the exit side, and that prevents drainage flowing into the drainage pit from flowing out of the exit, and drainage recovery. Tank and
A drainage collection means for collecting the wastewater in the drainage pit into a wastewater collection tank; and a control unit. The control unit instructs the mixing notification unit to notify the mixing of the chemical substance based on the determination of the determination unit, and Provided is a chemical substance outflow prevention system that instructs a road closing means to close a flow path and instructs a wastewater collecting means to collect wastewater in a wastewater collecting tank.

When the measurement result does not reach the set detection condition, the control unit instructs the flow path closing means to open. By providing drainage introduction grooves pierced or buried in the area to collect wastewater including rainwater from the area handling chemical substances and guide it to the drainage pit through the entrance, wastewater containing chemical substances from other than the drainage pit can be provided. It can be prevented from flowing out.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. Note that the present invention is not limited to this. FIG. 1 shows a chemical spill prevention system and a chemical spill monitoring device incorporated in the system according to one embodiment of the present invention. The chemical substance spill prevention system 10 includes a drain pit 1 that collects and receives waste water from an area A that handles chemical substances, a sluice gate 2 provided in the drain pit 1 as a channel closing means,
Wastewater recovery tank 3 and recovery pump 4 as wastewater recovery means
And a chemical substance outflow monitoring device 5.

The drainage pit 1 further includes an inflow tank 11 and a discharge tank 12 for drainage discharge disposed adjacent to and downstream of the inflow tank 11, and each of the tanks 11 has a baffle plate. 13 and 14 are provided. Baffle plate 1
Numerals 3 and 14 are arranged in the flow paths of the tanks 11 and 12, and the upper part of the flow path is closed and the lower part is opened so as to temporarily settle the flow of drainage. An inlet 11a of the inflow tank 11 is provided in an area A for handling a chemical substance.
A drain gutter 15 is connected to the drain pit 1 for collecting drain water from the drainage pit. Outlet 11b of inflow tank 11
Is formed as a weir in which drainage overflows in the discharge tank 12. The outlet part 12b of the discharge tank 12 is formed as a weir in which drainage overflows into the river B that can be discharged.
The water gate 2 is provided at the outlet 11b of the inflow tank 11.

The sluice 2 includes a partition plate 21, a partition plate support 22 for supporting the partition plate 21 so as to be movable in the vertical direction, and a motor 23 for moving the partition plate 21 in the vertical direction along the partition plate support 22. When the motor 23 is driven to lower the partition plate 21 at the upper standby position, the partition plate 21
The lower end 21a is in close contact with the outlet 11b to close the flow path.

The inlet 11a of the inflow tank 11 and the baffle plate 1
The collection pump 4 and the drainage collection pump 51 are arranged at the bottom of the tank between the three. The collection pump 4 is connected to the drainage collection tank 3 via the collection channel 31, and the drainage collection pump 51 is connected to the sample collection tank 53 via the collection channel 52. In the sample collection tank 53, each probe of the sensor section 6, which is a main component of the chemical substance outflow monitoring device 5, is disposed. Further, the sampling tank 53 is connected to the inflow tank 11 via an overflow channel 54 that opens at a liquid level slightly higher than each probe. The drainage collection pump 51 is disposed near the opening on the upstream side of the baffle plate 13 to properly collect wastewater mixed with chemical substances without being affected by the specific gravity of the chemical substances contained in the wastewater. Can be.

The sensor unit 6 includes a conductivity sensor 61,
A probe 61a is provided with a refractive index sensor 62 and a pH sensor 63, and each probe 61a
62a and 63a. As a specific example of the sensor section 6, the conductivity sensor 61 is manufactured by Yokogawa Electric Corporation / model name: SC210G-A-100-L015-03 * A / measurement range: 0 to 500 μS /
cm, refractive index sensor 62 manufactured by Tokai Yagami Co., Ltd./ Model name: PRO-85 type / Measurement range: 0 to 85%, pH sensor 63 manufactured by HORIBA, Ltd./ Model name: K-8 type industrial pH meter / Measurement Range: pH0
To 14 respectively. The sensor unit 6 includes a monitor 7
1 is connected to a personal computer 7. The monitor 71 displays the measurement result of the sensor unit 6 on a monitor screen, and issues a warning on the monitor screen or by sound as a mixing notification unit 72 that notifies the mixing of the chemical substance based on the determination of the determination unit described later. be able to.

FIG. 2 is a control block diagram of the chemical substance outflow prevention system 10 including the chemical substance outflow monitoring device 5. The chemical substance spill prevention system 10 includes a CPU, RO
The control unit 8 includes a personal computer 7 having an M, a RAM, a timer, and the like. The control unit 8 includes a determination unit that compares the measurement result of the sensor unit 6 with a preset set detection condition to determine mixing of a chemical substance into wastewater, and includes a sensor unit 6 and a mixing notification unit 72. Monitor 71,
The motor 23, the recovery pump 4, the drainage pump 51, and other input / output units are appropriately connected.

An example of the operation of the control unit 8 in the chemical substance outflow prevention system 10 will be described below with reference to the control flowchart of FIG. In this example, the chemical substance spill prevention system 10 is an area A that handles chemical substances used in pharmaceuticals, that is, a loading / unloading path for lorries, a tank yard for chemical substances such as raw materials, a warehouse, a synthesis building, a waste liquid treatment tank, and a waste liquid tank yard. Applies to facilities equipped with etc. In this area A, a side groove 15 for collecting rainwater and cooling water drainage and leading to the drainage pit 1 is bored or buried vertically and horizontally. In addition, the cooling water drainage is flown to the side groove 15 as needed, and is supplied to the drainage pit 1 from the inlet 11 a of the inflow tank 11.

First, after cleaning and calibrating each probe of the sensor section 6 disposed in the sample collection tank 53, initial setting such as resetting of a flag is performed in step S1 in FIG. The partition plate 21 of the sluice 2 is located at a standby position above the partition plate support 22 to open the flow path. Step S2
, The drainage collection pump 51 is driven, and the wastewater stored in the inflow tank 11 is supplied to the sample collection tank 5 through the collection flow path 52.
3 through the overflow channel 54 to the inflow tank 1
Return to 1. The sensor unit 6 continuously measures the sample in the sampling tank 53 based on the signal from each probe, and displays the measurement result on the monitor 71.

The judging section of the control section 8 compares the detection result of the sensor section 6 with the preset detection condition of each sensor as a criterion for judging the mixing of the chemical substance, and judges whether or not the chemical substance has mixed into the wastewater. Judge. Table 1 shows an example of a chemical substance mixing determination table. The chemical substance mixing determination table includes setting detection conditions for each measurement item of conductivity, refractive index, and pH, and setting values assuming that the chemical substance is supplied to the sampling tank 53 as undiluted solution without being diluted. (Upper limit) and 10 assuming that the chemical substance is diluted by rainwater etc.
Specify the set value (lower limit value) at the time of double dilution.

[0021]

[Table 1]

For example, the set detection condition is that the conductivity is 5 μS
(Siemens) / cm or less, 320 μS (Siemens) / cm or more, refractive index of 3.0% or more, and pH of 5.0 or less, 9.5 or more. The set value or set range (between the upper limit value and the lower limit value) of the chemical substance can be arbitrarily set in consideration of the capacity of the drain pit 1, the inflow of rainwater or cooling water, and the like. Further, the chemical substance assumed to be mixed can be arbitrarily set, and can be appropriately set based on the raw materials, the solvent, the waste liquid, etc. handled in the area A. These set detection conditions and set values or set ranges of chemical substances are registered and recorded in the control unit 8 in advance.

If any one of the measurement results of the sensor unit 6 matches the set detection condition, it is determined that "the presence of a chemical substance is present" (steps S3 to S5). When it is determined that "there is a chemical substance mixed in", an alarm is generated in the mixed notifying unit 72 in step S6, the motor 23 is driven to close the water gate 2, and the recovery pump 4 is driven at the same time.
As a result, the outflow of the wastewater determined to be “mixed with a chemical substance” to the discharge tank 12 is prevented. The wastewater that has flowed into the inflow tank 11 is transferred to the wastewater recovery tank 3 via the recovery flow path 31 and is temporarily stored therein.

The operation of each unit is continued until all the measurement results of the sensor unit 6 deviate from the set detection conditions described above. During this time, the determination unit searches for a substance to be detected (step S7). The search for the substance to be detected is performed by the sensor unit 6
A chemical substance determined to be from area A is specified based on the measurement result of (1). Specifically, the types and combinations of the measurement items determined to be mixed with the chemical substance, the position of the measurement result in the above set range, the presence or absence of cooling water drainage and rainwater, or the conditions of rainfall are superimposed on the chemical conditions. Narrow down substances.

When the determination section of the control section 8 determines that "no chemical substance is mixed", that is, when it is determined that all the measurement results of the sensor section 6 are out of the set detection conditions, the alarm is stopped. , The floodgate 2 is opened, and the drive of the recovery pump 4 is stopped (steps S8 and S9).
From this point, the drainage can be drained to the river B via the discharge tank 12. The search for the detected substance can be continued, but can be stopped. The wastewater from the wastewater recovery tank 3 is sent to a wastewater treatment tank 32 (not shown) in the area A to perform appropriate wastewater treatment. If the operation of the chemical substance outflow prevention system 10 is to be continued, the process proceeds to step S3.

In the above embodiment, the judgment unit judges whether or not a chemical substance is mixed based on three different measurement items of the sensor unit 6, that is, three measurement results of conductivity, refractive index, and pH. The contamination of various types of chemical substances can be detected more accurately. It should be noted that it is possible to detect a mixture of various types of chemical substances in substantially the same manner by focusing only on the measurement results of the two measurement items of the conductivity and the refractive index. In addition, by overlapping a plurality of conditions with one measurement item as one condition, it is possible to narrow down the chemical substances determined to be mixed with higher accuracy.

Further, in the above embodiment, the chemical substance to be detected is assumed in advance together with the set values (the upper limit value and the lower limit value) as described in the chemical substance mixing determination table in Table 1. However, in the present invention, it is clear that the target chemical substance for which the determination unit determines the presence or absence of the contamination is not limited to the chemical substance described in the table or the like and assumed in advance together with the set value.

That is, in the present invention, the condition for detecting the setting of the conductivity and the refractive index or the pH is regarded as a normal state in which water such as rainwater or cooling water flows into the drain pit 1, and an abnormal state, that is, water is detected. It is set to detect the state of inflow of a chemical substance having a property different from the conductivity and refractive index or pH, so that in some cases, it is possible to react even with chemical substances judged to be harmless from the viewpoint of environmental conservation. It can also be operated as a chemical substance spill prevention system 10 for a wide range of chemical substances.

[0029]

According to the chemical substance spill monitoring device and the chemical substance spill prevention system of the present invention, respective sensors for measuring the conductivity and the refractive index of the waste water are provided in a drain pit for collecting the waste water from an area handling the chemical substance. Since it is only provided, it is possible to detect various kinds of chemical substances with a simple device configuration, and it is also possible to specify or estimate a chemical substance by combining the measurement results of the respective sensor units. Therefore, it is possible to more reliably prevent the wastewater containing the chemical substance from accidentally flowing out of the area from the area where the chemical substance is handled.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a chemical spill prevention system having a chemical spill monitoring device according to one embodiment of the present invention.

FIG. 2 is a control block configuration diagram of the chemical substance outflow prevention system of FIG. 1;

FIG. 3 is a control flowchart of the chemical substance outflow prevention system of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drain pit 5 Chemical substance outflow monitoring device 6 Sensor part 8 Control part 10 Chemical substance outflow prevention system 11a Inlet part 11b Outlet part 61 Conductivity sensor 62 Refractive index sensor 72 Mixing notification part

Claims (9)

[Claims] 1. Collecting wastewater from an area handling chemical substances, temporarily receiving the wastewater from an inlet, and monitoring whether or not a certain kind of chemical is contained in the wastewater flowing into a drainage pit discharged from an outlet. A device that is installed in a drainage pit and detects the properties of drainage, and compares the measurement results of the sensor with preset detection conditions to determine whether chemical substances have been mixed into the wastewater. And a mixing reporting unit that reports mixing of a chemical substance based on the determination by the determining unit.The sensor unit includes at least sensors for measuring at least the conductivity and the refractive index of the wastewater. Chemical substance spill monitoring device. 2. The chemical substance according to claim 1, wherein the judging section judges the mixing of the chemical substance into the wastewater when at least one of the measurement results of the conductivity sensor and the refractive index sensor matches the set detection condition. Outflow monitoring device. 3. The chemical substance outflow monitoring device according to claim 1, wherein the sensor unit further includes a pH sensor for measuring a pH of the wastewater. 4. A determination unit compares the measurement result of the sensor unit with each set detection condition from a stock solution of a certain chemical substance to a state of being diluted with water at a predetermined magnification to determine the contamination of the chemical substance. The chemical substance outflow monitoring device according to any one of claims 1 to 3. 5. The chemical according to claim 1, wherein the judging section, when judging the mixing of the chemical substance, estimates the mixed chemical substance by using the measurement result of the sensor section complementarily. Material spill monitoring device. 6. The sensor according to claim 1, wherein the sensor unit includes a sampling tank for arranging the sensors so as to be measured, and a drainage pump for supplying drainage from a drainage pit to the sampling tank. Chemical spill monitoring device as described. 7. A drain collection pump, which is disposed in a flow path of a drain pit, has an upper opening of a flow path closed so as to temporarily settle the flow of drain water, and an opening on a lower side of the baffle body. 7. The chemical substance outflow monitoring device according to claim 6, which is disposed in the vicinity. 8. A sensor having a drainage pit having an inlet and an outlet for wastewater and collecting and receiving wastewater from an area handling chemical substances, and a sensor comprising at least sensors for measuring at least conductivity and refractive index of the wastewater. Unit, a determination unit that compares the measurement result of the sensor unit with a preset detection condition to determine mixing of the chemical substance in the wastewater, and notifies the mixing of the chemical substance based on the determination of the determination unit. Drainage in the drainage pit, drainage pit, and drainage pit, which is provided on the exit side to be openable and closable to prevent drainage that has flowed into the drainage pit from flowing out of the outlet A drainage collection unit that collects the wastewater in the collection tank, and a control unit.The control unit instructs the mixing notification unit to notify the mixing of the chemical substance based on the determination of the determination unit. Order closure and wastewater collection means Chemical spill prevention system that instructs wastewater to be collected in a wastewater collection tank. 9. The control section instructs the flow path closing means to open when the measurement result does not reach the set detection condition.
Chemical spill prevention system according to 1.