CN110057396B - Continuous monitoring system and early warning method for volatile organic compounds in soil and underground water - Google Patents
Continuous monitoring system and early warning method for volatile organic compounds in soil and underground water Download PDFInfo
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Abstract
The invention provides a continuous monitoring system and an early warning method for volatile organic compounds in soil and underground water. The system comprises a sensor integrated unit (1), a data transmission unit (2) and a data processing unit (3), wherein the sensor integrated unit (1) is electrically connected with the data processing unit (3) through the data transmission unit (2), and the sensor integrated unit (1) comprises a buoy (5), a volatile gas detection sensor (6) arranged at the top of the buoy and a water quality parameter sensor (7) arranged at the bottom of the buoy. The monitoring system can perform long-time online monitoring, and improves the sampling monitoring efficiency.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to a continuous monitoring system and an early warning method for volatile organic compounds in soil and underground water, and more particularly to a continuous monitoring system and an early warning method for volatile organic compounds in soil and underground water of refining enterprises.
Background
The petroleum production industry has complex process, long product chain, multiple intermediate products and product types, complex pollutant components, high toxicity and poor biodegradability, and is considered to be a high-risk industry easily causing soil and underground water. In the face of increasingly severe prevention and control situations of the pollution risks of the soil and the underground water, the development of environment monitoring of the soil and the underground water of the enterprise is the primary link of prevention and control of the pollution risks of the soil and the underground water.
At present, the monitoring research of soil and underground water becomes a hotspot of the research of the pollution prevention and control technology in the current petroleum refining industry. Among them, volatile organic compounds, which are characteristic pollutants in the petroleum refining industry, are a difficult point and key point for monitoring soil and underground water due to various types, great harmfulness and wide influence range. After investigation on 24 refining enterprises of Chinese petroleum, the following problems are mainly found in the monitoring of pollutants in the soil and underground water of the enterprises:
(1) the monitoring of the soil and underground water of the enterprise mainly depends on manual sampling monitoring. It often takes a worship or even longer to complete a full monitoring of a water section. Therefore, the existing manual sampling monitoring method cannot meet the requirement of the capability of monitoring and early warning numerous pollutants in all weather.
(2) The original data acquisition frequency has certain hysteresis when being used for groundwater leakage early warning. Once monitoring is carried out once a month or a quarter, the manager has difficulty in making a timely judgment on the emergency through the original data.
(3) Traditional volatile organic compounds's gas chromatography instrument that detects is expensive, and is required for experimental environment higher, is used for laboratory quantitative analysis more, can't carry the field usage to, and can't monitor the organic pollutant in soil and the groundwater simultaneously.
Disclosure of Invention
It is an object of the present invention to provide a continuous monitoring system for soil and groundwater volatile organic compounds.
Another object of the present invention is to provide a method for continuously monitoring volatile organic compounds in soil and groundwater.
Still another object of the present invention is to provide a method for early warning of volatile organic compounds in soil and groundwater.
In order to achieve the above objects, in one aspect, the present invention provides a continuous monitoring system for volatile organic compounds in soil and underground water, wherein the system comprises a sensor integrated unit 1, a data transmission unit 2, and a data processing unit 3, the sensor integrated unit 1 is electrically connected to the data processing unit 3 through the data transmission unit 2, and the sensor integrated unit 1 comprises a buoy 5, a volatile gas detection sensor 6 arranged on the top of the buoy, and a water quality parameter sensor 7 arranged on the bottom of the buoy.
According to some embodiments of the present invention, the buoy has a through hole 8 and a slide rail on which the volatile gas sensor 6 can move up and down.
The slide rail may be a slide rail conventional in the art, for example, the slide rail includes a first rail 51 and a second rail 52, the first rail 51 is fixedly disposed on the top of the buoy 5, the second rail 52 is fixedly disposed on the gas sensor 6, and the first and second slide rails 51 and 52 are slidably connected to each other.
Through setting up the through-hole on the buoy, volatile organic compounds in the monitoring well enters into the buoy through the through-hole, and gas sensor is used for monitoring soil gas and the volatile organic compounds that aquatic is volatile.
Through set up the arc top cap on the buoy, set up the slot according to the aerodynamic principle, make the volatile organic compounds in the monitoring well in the in-process that rises, form the vortex, the gathering is at the buoy center. The advantage lies in the use of natural diffusion of volatile organic compounds without the use of pumps.
Through simulation test in a laboratory, the arc-shaped top cover can enable the detection limit of volatile organic compounds to reach 0.5 ppm.
According to some embodiments of the present invention, one or more of a dissolved oxygen electrode 711, a conductive electrode 712, a pH electrode 713, an ORP electrode 714, a turbidity electrode 715, and a temperature sensor 716 is further disposed within the float; one or more of the dissolved oxygen electrode 711, the conductive electrode 712, the pH electrode 713, the ORP electrode 714, the turbidity electrode 715, and the temperature sensor 716 are disposed at a bottom end within the float such that the one or more electrodes and sensors are submerged within 1m of the water surface when the float is in an operational state.
According to the monitoring standard of the groundwater environment and the pollution characteristics of refining and chemical enterprises, low-density non-aqueous phase liquid (LNAPL) in the groundwater mainly exists at the position of 0-1 meter below the groundwater surface. According to the buoyancy calculation formula FFloating body＝ρLiquid for treating urinary tract infectionVRow boardg…………………………①
In order to control the water quality, the sensor is positioned at the position (0-1) meter below the water surface, namely
VRow board＝πr2h in h<1…………………………②
According to FFloating body＝GArticle (A)＝mg…………………………③
To obtain: rhoLiquid for treating urinary tract infectionVRow boardg＝mg…………………………④
Further: rhoLiquid for treating urinary tract infectionπr2hg＝mg…………………⑤
Further: h is m/rhoLiquid for treating urinary tract infectionπr2…………………⑥
Namely:
namely: m < rhoLiquid for treating urinary tract infectionπr2……………………………⑧
Wherein: rhoLiquid for treating urinary tract infectionDensity of water intake: 1X 103kg/m3According to well drilling standards, r is 0.045 m; the mass m of the entire sensor integrated system<6kg；
Further, in order to control the center of gravity of the buoy and reduce the weight of the system, the preferable weight m of the whole system is less than 1.5 kg; enabling the sensor to be close to the LNAPL as much as possible, and taking the buoy material as PVC, preferably a PVC pipe;
preferably, the diameter of the float is 90 mm; the height of the buoy is 380 mm; the buoyancy of the buoy just meets the condition that the water quality sensor is located 0-1 meter below the water surface.
According to some specific embodiments of the present invention, the system further comprises a solar power supply system 4, wherein the solar power supply system 4 is electrically connected to the sensor integration unit 1, the data transmission unit 2 and the data processing unit 3.
According to some embodiments of the present invention, an electric cleaning brush 72 is disposed on the probe 71 of the water quality parameter sensor 7.
The invention can start the electric cleaning brush to clean the sensor probe before each measurement.
In another aspect, the present invention further provides a method for continuously monitoring volatile organic compounds in soil and underground water by using the monitoring system of any one of the present invention, wherein the method comprises:
(1) drilling an underground water monitoring well in an area to be monitored, placing a buoy (5) in the underground water monitoring well, and ensuring that a water quality parameter sensor 7 is submerged within 1m of the water surface; the volatile gas detection sensor 6 is positioned within 2m above the water surface;
(2) detecting the water temperature, dissolved oxygen, electric conductivity, pH, ORP and turbidity of water in the underground water monitoring well through a water quality parameter sensor 7; volatile organic compounds in the soil and the underground water are simultaneously detected by utilizing a volatile gas detection sensor 6;
(3) modeling and fitting the data by the data processing unit 3 according to the data obtained in the step (2), and calculating the thickness of the light non-aqueous phase liquid; calculating the content of volatile organic compounds in the water according to the gas-liquid balance coefficient;
(4) and (4) substituting the volatile organic compound content in the water measured in the step (3) into a model through a calculation model calibrated by the system, and calculating the concentration of the total volatile organic compounds in the monitoring well.
According to some embodiments of the invention, the volatile organic compound is selected from the group consisting of light non-aqueous liquids, benzene series, halogenated hydrocarbons, and mixtures of one or more of petroleum hydrocarbon compounds.
According to some embodiments of the present invention, the calculation model of step (3) is:
CBTEX2＝δCBTEX1wherein: delta is a gas-liquid equilibrium coefficient; cBTEX2Monitoring the total content of gaseous volatile organic compounds in the well for underground water; cBTEX1And monitoring the content of volatile organic compounds in water in the well for underground water.
According to some embodiments of the invention, δ is calculated according to the following equation:
According to some embodiments of the present invention, in step (3), the thickness H of the light non-aqueous phase liquid is calculated by using the following formulaLNAPL：
Wherein: t is water temperature in Kelvin; hLNAPLIs light non-aqueous liquid (LNAPL) thickness in mm; gMeasuringConducting in a monitoring well to be detected; gBack of bodyThe conductance in the well is monitored for background.
According to some specific embodiments of the invention, the step (1) comprises sampling water and gas in the background monitoring well and the groundwater monitoring well according to the characteristic pollution factor of the refinery enterprise, and analyzing the samples to detect the initial CBTEX1And CBTEX2And then calculating to obtain a gas-liquid equilibrium coefficient delta.
According to some specific embodiments of the invention, the step (1) comprises sampling water and gas in the background monitoring well and the groundwater monitoring well according to the characteristic pollution factor of the refinery enterprise, and analyzing the samples to detect the initial CBTEX1And CBTEX2Then according to formula CBTEX2＝δCBTEX1And calculating to obtain a gas-liquid balance coefficient delta.
According to some embodiments of the invention, the method of the invention may specifically comprise:
(1) according to the characteristic pollution factor of the refining and chemical enterprises, water and gas in a background monitoring well and a monitoring well to be detected are sampled, the samples are sent to a laboratory for analysis, and the detection items are as follows: concentration of benzene series in groundwater and soil (C)BTEX1) And total content (C) of gaseous volatile organic compounds in underground water monitoring wellBTEX2)。
(2) Placing the buoy 5 in water in a background monitoring well and a monitoring well to be detected, and ensuring that the water quality parameter sensor 7 is submerged within 0-1 m of the water surface, preferably within 0-0.25 m of the water surface; the volatile gas detection sensor 6 moves up and down along the guide rail and is positioned at the highest concentration position of volatile organic compounds in the soil gas;
(3) reading the concentration value (C) of the volatile gas detection sensor 6BTEX2) (ii) a The water temperature (T), dissolved oxygen (d), conductance (G), ph (p), orp (o), and turbidity (T) of the water quality parameter sensor 7 are read.
(4) Establishing a model: cBTEX2＝δCBTEX1Wherein: delta is a gas-liquid equilibrium coefficient;
(5)
wherein: t is water temperature in Kelvin; hLNAPLIs light non-aqueous liquid (LNAPL) thickness in mm; gMeasuringConducting in a monitoring well to be detected; gBack of bodyMonitoring the conductance in the well for background;
(6) further, in the above-mentioned case,
(7) through the steps (1) to (4), the concentration (C) of the underground water and the soil gas benzene series of each monitoring well can be calculatedBTEX1)；
(8) And (3) obtaining the thickness of the light non-aqueous phase liquid (LNAPL) in each monitoring well through the steps (1) to (6).
According to some embodiments of the invention, the volatile organic is selected from the group consisting of light non-aqueous liquid (LNAPL), benzene series, halogenated hydrocarbons, and petroleum hydrocarbon compounds.
And drilling a well at a key monitoring position, wherein the drilling must comply with DZ/T0270-2014 underground water monitoring well construction specifications, and monitoring wells capable of monitoring soil gas and underground water simultaneously are constructed.
In another aspect, the present invention further provides a method for performing early warning on volatile organic compounds in soil and underground water by using the monitoring system of any one of the present invention, wherein the method comprises the following steps:
(1) drilling an underground water monitoring well in an area to be monitored, placing the buoy 5 in the underground water monitoring well, and ensuring that the water quality parameter sensor 7 is submerged within 1m of the water surface; the volatile gas detection sensor 6 is positioned within 2m above the water surface;
(2) detecting the water temperature, dissolved oxygen, electric conductivity, pH, ORP and turbidity of water in the underground water monitoring well through a water quality parameter sensor 7; volatile organic compounds in the soil and the underground water are simultaneously detected by utilizing a volatile gas detection sensor 6;
(3) modeling and fitting the data by the data processing unit (3) according to the data obtained in the step (2), and calculating the thickness of the light non-aqueous phase liquid; calculating the content of volatile organic compounds in the water according to the gas-liquid balance coefficient;
(4) substituting the volatile organic compound content in the water measured in the step (3) into a model through a calculation model calibrated by the system, and calculating the concentration of the total volatile organic compounds in the monitoring well;
(5) and (4) sending out early warning information to realize an early warning function when the value exceeds an alarm threshold value according to the thickness of the light non-aqueous phase liquid obtained in the step (3) and the concentration of the total volatile organic compounds in the monitoring well obtained in the step (4).
According to some embodiments of the present invention, the calculation model of step (3) is:
CBTEX2＝δCBTEX1wherein: delta is a gas-liquid equilibrium coefficient; cBTEX2Monitoring the total content of gaseous volatile organic compounds in the well for underground water; cBTEX1And monitoring the content of volatile organic compounds in water in the well for underground water.
According to some embodiments of the invention, δ is calculated according to the following equation:
According to some embodiments of the present invention, in step (3), the thickness H of the light non-aqueous phase liquid is calculated by using the following formulaLNAPL：
Wherein: t is water temperature in Kelvin; hLNAPLIs light non-aqueous liquid (LNAPL) thickness in mm; gMeasuringConducting in a monitoring well to be detected; gBack of bodyThe conductance in the well is monitored for background.
According to some specific embodiments of the invention, the step (1) comprises sampling water and gas in the background monitoring well and the groundwater monitoring well according to the characteristic pollution factor of the refinery enterprise, and analyzing the samples to detect the initial CBTEX1And CBTEX2And then calculating to obtain a gas-liquid equilibrium coefficient delta.
According to some embodiments of the invention, step (1) comprises determining the contamination factor based on the characteristics of the refinerySampling water and gas in the background monitoring well and the underground water monitoring well, and analyzing the samples to detect and obtain initial CBTEX1And CBTEX2Then according to formula CBTEX2＝δCBTEX1And calculating to obtain a gas-liquid balance coefficient delta.
According to some embodiments of the invention, the method of the invention may specifically comprise:
(1) according to the characteristic pollution factor of the refining and chemical enterprises, water and gas in a background monitoring well and a monitoring well to be detected are sampled, the samples are sent to a laboratory for analysis, and the detection items are as follows: concentration of benzene series in groundwater and soil (C)BTEX1) And total content (C) of gaseous volatile organic compounds in underground water monitoring wellBTEX2)；
(2) Placing the buoy 5 in water in a background monitoring well and a monitoring well to be detected, and ensuring that the water quality parameter sensor 7 is submerged within 0-1 m of the water surface, preferably within 0-0.25 m of the water surface; the volatile gas detection sensor 6 moves up and down along the guide rail and is positioned at the highest concentration position of volatile organic compounds in the soil gas;
(3) reading the concentration value (C) of the volatile gas detection sensor 6BTEX2) (ii) a The water temperature (T), dissolved oxygen (d), conductance (G), ph (p), orp (o), and turbidity (T) of the water quality parameter sensor 7 are read.
(4) Establishing a model: cBTEX2＝δCBTEX1Wherein: delta is a gas-liquid equilibrium coefficient;
(5)
wherein: t is water temperature in Kelvin; hLNAPLIs light non-aqueous liquid (LNAPL) thickness in mm; gMeasuringConducting in a monitoring well to be detected; gBack of bodyMonitoring the conductance in the well for background;
(6) further, in the above-mentioned case,
(7) through the steps (1) to (4), underground water and soil of each monitoring well can be calculatedConcentration of benzene series in the soil gas (C)BTEX1)；
(8) Obtaining the thickness of light non-aqueous phase liquid (LNAPL) in each monitoring well through the steps (1) - (6);
(9) and (4) sending out early warning information when the numerical value obtained in the steps (1) to (6) exceeds an alarm threshold value, so as to realize an early warning function.
According to some embodiments of the invention, the volatile organic is selected from the group consisting of light non-aqueous liquid (LNAPL), benzene series, halogenated hydrocarbons, and petroleum hydrocarbon compounds.
According to some embodiments of the invention, step (1) further comprises drilling a background monitor well.
Background monitoring wells of the present invention are well known in the art and, in general, are located in uncontaminated areas upstream of the monitoring well.
The invention can draw the data curves of six parameters of water quality and soil gas parameters by monitoring the soil and underground water of a certain monitoring well on line for a long time, such as half a month, and takes the median as the background value; 2 times of the background value is an early warning value (adjustable); when the monitored data is abnormal and is higher than the early warning value, the data center issues early warning information through the platform, and online early warning is achieved.
According to the invention, through laboratory simulation, the correlation parameter between the six parameters of the water quality and the concentration of the volatile organic compounds can be established, so that the monitoring and early warning of the volatile organic compounds in the water can be indirectly realized by only measuring the six parameters of the water quality.
In conclusion, the invention provides a continuous monitoring system and method for volatile organic compounds in soil and underground water. The method of the invention has the following advantages:
1. simultaneously monitoring volatile organic compounds in underground water and volatile organic compounds in soil gas in the monitoring well of the refining enterprise;
2. the online monitoring can be carried out for a long time, and the sampling monitoring efficiency is improved;
3. if the threshold value is exceeded, early warning can be timely carried out, and pollution is prevented;
4. the real-time tracking and wireless transmission of monitoring data are realized, and the manual workload is reduced.
Drawings
FIG. 1 is a schematic view of a monitoring system according to embodiment 1;
fig. 2 is a schematic view of a sensor integrated unit according to embodiment 1.
FIG. 3 is a schematic diagram showing an arrangement of water quality sensor units according to example 1;
fig. 4 is a schematic view of the volatile gas detection sensor arrangement of example 1.
Detailed Description
The following detailed description is provided for the purpose of illustrating the embodiments and the advantageous effects thereof, and is not intended to limit the scope of the present disclosure.
Example 1
The invention relates to a continuous online monitoring and early warning method for volatile organic compounds in soil and underground water of an refining enterprise, which is shown in figures 1 and 2.
The method comprises the following steps: the system comprises a sensor integration unit 1, namely a water quality parameter sensor 7 and a volatile gas detection sensor 6 (set), a solar power supply system 4 (set), a data acquisition and transmission unit (set) (2 in figure 1), and a data processing unit 3. The buoy 5 comprises a dissolved oxygen electrode (711 in fig. 3), a conductive electrode (712 in fig. 3), a pH electrode (713 in fig. 3), a 0RP electrode (714 in fig. 3), a turbidity electrode (715 in fig. 3), a temperature sensor (716 in fig. 3), and a gas sensor (6 in fig. 2), and the volatile gas detection sensor 6 can move up and down through sliding rails (51, 52) (as shown in fig. 4, wherein a first rail 51 of the sliding rails is fixedly arranged on the top of the buoy 5, a second rail 52 is fixedly arranged on the gas sensor 6, and the first sliding rail 51 and the second sliding rail 52 can be connected in a relatively sliding manner). The buoy (5 in figure 2) realizes dynamic balance of the buoy by the buoyancy of water, and dynamically changes along with the change of the water level of underground water, so that the water quality sensor is ensured to be always immersed in the water.
The dissolved oxygen electrode, the conductive electrode, the pH electrode, the ORP electrode, the turbidity electrode, the temperature sensor and the gas sensor realize data acquisition through a data acquisition circuit board of the system, and the acquisition unit transmits data to a transmission unit of the system through a lead. And the transmission unit uploads the data to the monitoring platform through a wireless network.
And (3) monitoring process:
1. and selecting point locations in background points and key monitoring areas, and drilling a monitoring well according to the standard DZ/T0270-2014 underground water monitoring well construction standard. Sampling water and gas in the background monitoring well and the underground water monitoring well, and analyzing the samples to detect and obtain initial CBTEX1And CBTEX2Then according to formula CBTEX2＝δCBTEX1And calculating to obtain a gas-liquid balance coefficient delta.
2. The buoy is placed in a background point monitoring well, and the systems are communicated according to a wiring diagram according to the description, so that data uploading is realized.
3. Recording monitoring data of 1 week on a monitoring platform, drawing trend lines of pollution factors such as dissolved oxygen, conductivity, pH, ORP, turbidity, volatile organic compounds and the like, fitting, and taking a median as a background value; the 3 times background value is the alarm threshold. The concentration of the volatile organic compounds in the monitoring well is calculated according to the following calculation model:
CBTEX2＝δCBTEX1wherein: delta is a gas-liquid equilibrium coefficient;
4. and repeating the steps 1-3 in the monitoring wells of the key monitoring areas.
5. And when the monitoring data in the monitoring well of the key monitoring area reaches an alarm threshold value, the monitoring platform issues alarm information.
The invention monitors the measuring range and precision:
temperature: (-5- +50) deg.c, + -0.1 deg.c;
conductivity: (0 to 350000) mu S/cm; the value is shown by +/-1%;
pH：(0～14)pH；±0.1pH；
ORP：±1400mV；±5mV；
DO：(0～50)mg/L；±0.2mg/L；
turbidity: (0-4000) NTU; +/-2 NTU;
volatile organic compounds: (0 to 1000) ppm.
Claims (6)
1. A continuous monitoring system for volatile organic compounds in soil and underground water comprises a sensor integrated unit (1), a data transmission unit (2) and a data processing unit (3), wherein the sensor integrated unit (1) is electrically connected with the data processing unit (3) through the data transmission unit (2), and the sensor integrated unit (1) comprises a buoy (5), a volatile gas detection sensor (6) arranged at the top of the buoy and a water quality parameter sensor (7) arranged at the bottom of the buoy; the buoy is also internally provided with an oxygen dissolving electrode (711), a conductive electrode (712), a pH electrode (713), an ORP electrode (714), a turbidity electrode (715) and a temperature sensor (716); the dissolved oxygen electrode (711), the conductive electrode (712), the pH electrode (713), the ORP electrode (714), the turbidity electrode (715) and the temperature sensor (716) are arranged at the bottom end in the buoy, so that one or more of the electrodes and the sensors are submerged in 1m of the water surface when the buoy is in a working state; the upper part of the buoy is provided with a through hole (8) and slide rails (51 and 52), and the volatile gas detection sensor (6) can move up and down on the slide rails; the slide rail comprises a first rail (51) and a second rail (52), the first rail (51) is fixedly arranged at the top of the buoy (5), the second rail (52) is fixedly arranged on the volatile gas sensor (6), and the first rail (51) and the second rail (52) are mutually connected in a relatively sliding manner; the mass m of the whole sensor integrated unit is less than 6 kg.
2. The system according to claim 1, wherein the system further comprises a solar power supply system (4), the solar power supply system (4) being electrically connected with the sensor integration unit (1), the data transmission unit (2) and the data processing unit (3).
3. The system according to claim 1, wherein an electric cleaning brush (72) is arranged on the probe (71) of the water quality parameter sensor (7).
4. A method for continuously monitoring soil and underground water volatile organic compounds by using the monitoring system of any one of claims 1 to 3, wherein the method comprises the following steps:
(1) drilling an underground water monitoring well in an area to be monitored, placing the buoy (5) in the underground water monitoring well, and ensuring that the water quality parameter sensor (7) is submerged within 1m of the water surface; the volatile gas detection sensor (6) is positioned within 2m above the water surface; according to characteristic pollution factors of refining and chemical enterprises, water and gas in a background monitoring well and a groundwater monitoring well are sampled, and the samples are analyzed to obtain initial C through detectionBTEX1And CBTEX2Then according to formula CBTEX2＝δCBTEX1Calculating to obtain a gas-liquid balance coefficient delta;
(2) detecting the water temperature, dissolved oxygen, electric conductivity, pH, ORP and turbidity of water in the underground water monitoring well through a water quality parameter sensor (7); volatile organic compounds in the soil and the underground water are simultaneously detected by utilizing a volatile gas detection sensor (6);
(3) modeling and fitting the data by the data processing unit (3) according to the data obtained in the step (2), and calculating the thickness of the light non-aqueous phase liquid; calculating the content of volatile organic compounds in the water according to the gas-liquid balance coefficient;
the calculation model of the step (3) is as follows:
CBTEX2＝δCBTEX1wherein: delta is a gas-liquid equilibrium coefficient; cBTEX2Monitoring the total content of gaseous volatile organic compounds in the well for underground water; cBTEX1Monitoring the content of volatile organic compounds in water in the well for underground water;
and calculating the thickness H of the light non-aqueous phase liquid by using the following formulaLNAPL：
Wherein: t is water temperature in Kelvin; hLNAPLIs light non-aqueous liquid (LNAPL) thickness in mm; gMeasuringConducting in a monitoring well to be detected; gBack of bodyMonitoring the conductance in the well for background;
(4) and (4) substituting the volatile organic compound content in the water measured in the step (3) into a model through a calculation model calibrated by the system, and calculating the concentration of the total volatile organic compounds in the monitoring well.
5. A method for early warning of soil and underground water volatile organic compounds by using the monitoring system of any one of claims 1 to 3, the method comprising the following steps:
(1) drilling an underground water monitoring well in an area to be monitored, placing the buoy (5) in the underground water monitoring well, and ensuring that the water quality parameter sensor (7) is submerged within 1m of the water surface; the volatile gas detection sensor (6) is positioned within 2m above the water surface; according to characteristic pollution factors of refining and chemical enterprises, water and gas in a background monitoring well and a groundwater monitoring well are sampled, and the samples are analyzed to obtain initial C through detectionBTEX1And CBTEX2Then according to formula CBTEX2＝δCBTEX1Calculating to obtain a gas-liquid balance coefficient delta;
(2) detecting the water temperature, dissolved oxygen, electric conductivity, pH, ORP and turbidity of water in the underground water monitoring well through a water quality parameter sensor (7); volatile organic compounds in the soil and the underground water are simultaneously detected by utilizing a volatile gas detection sensor (6);
(3) modeling and fitting the data by the data processing unit (3) according to the data obtained in the step (2), and calculating the thickness of the light non-aqueous phase liquid; calculating the content of volatile organic compounds in the water according to the gas-liquid balance coefficient;
the calculation model of the step (3) is as follows:
CBTEX2＝δCBTEX1wherein: delta is a gas-liquid equilibrium coefficient; cBTEX2Monitoring the total content of gaseous volatile organic compounds in the well for underground water; cBTEX1Monitoring the content of volatile organic compounds in water in the well for underground water;
and calculating the thickness H of the light non-aqueous phase liquid by using the following formulaLNAPL：
Wherein: t is water temperature in Kelvin; hLNAPLIs light non-aqueous liquid (LNAPL) thickness in mm; gMeasuringConducting in a monitoring well to be detected; gBack of bodyMonitoring the conductance in the well for background;
(4) substituting the volatile organic compound content in the water measured in the step (3) into a model through a calculation model calibrated by the system, and calculating the concentration of the total volatile organic compounds in the monitoring well;
(5) and (4) sending out early warning information to realize an early warning function when the value exceeds an alarm threshold value according to the thickness of the light non-aqueous phase liquid obtained in the step (3) and the concentration of the total volatile organic compounds in the monitoring well obtained in the step (4).
6. The method of claim 4 or 5, wherein the volatile organic is selected from the group consisting of a mixture of one or more of light non-aqueous liquids, benzene series, halogenated hydrocarbons, and petroleum hydrocarbon compounds.
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| CN114441719A (en) * | 2020-10-20 | 2022-05-06 | 中国石油化工股份有限公司 | Volatile organic compound online monitoring method and system |
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