CN117516814B - Soil pollution hidden trouble investigation method for identifying leakage of underground storage tank - Google Patents
Soil pollution hidden trouble investigation method for identifying leakage of underground storage tank Download PDFInfo
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- 238000003860 storage Methods 0.000 title claims abstract description 144
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000003900 soil pollution Methods 0.000 title claims abstract description 22
- 238000011835 investigation Methods 0.000 title claims abstract description 17
- 238000012544 monitoring process Methods 0.000 claims abstract description 202
- 239000002680 soil gas Substances 0.000 claims abstract description 67
- 239000002689 soil Substances 0.000 claims abstract description 47
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 43
- 231100000719 pollutant Toxicity 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005070 sampling Methods 0.000 claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 11
- 239000003673 groundwater Substances 0.000 claims description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 238000000692 Student's t-test Methods 0.000 claims description 7
- 238000012353 t test Methods 0.000 claims description 7
- 239000012855 volatile organic compound Substances 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 5
- 238000001179 sorption measurement Methods 0.000 claims description 5
- 238000006065 biodegradation reaction Methods 0.000 claims description 3
- 238000003795 desorption Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 125000001997 phenyl group Chemical class [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 2
- 238000000638 solvent extraction Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002360 explosive Substances 0.000 abstract description 2
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 21
- 239000011148 porous material Substances 0.000 description 4
- 238000005527 soil sampling Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 239000003570 air Substances 0.000 description 2
- 230000010485 coping Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
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- 102100034578 Desmoglein-2 Human genes 0.000 description 1
- 101000924314 Homo sapiens Desmoglein-2 Proteins 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001555 benzenes Chemical class 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 150000008280 chlorinated hydrocarbons Chemical group 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
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- 239000002352 surface water Substances 0.000 description 1
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Abstract
The invention discloses a method for checking hidden danger of soil pollution for identifying leakage of an underground storage tank, which comprises the following steps: s1, acquiring storage tank information, S2, arranging monitoring points, S3, determining the content of target pollutants, S4 and judging leakage, wherein the underground soil gas can be passively monitored at any time through the monitoring points so as to judge and detect whether the underground storage tank leaks or not in time, and the normal production activity of enterprises is not influenced; through the determination, primary judgment and secondary judgment of the content of the target pollutants, the daily monitoring of the underground storage tank can be controlled, the obtained leakage check result is accurate, frequent operation of soil and underground water sampling check is avoided, and therefore the operation pressure of personnel is reduced while accurate monitoring judgment is realized. The daily monitoring of the monitoring hole can realize the potential safety hazard investigation of the underground inflammable and explosive gas.
Description
Technical Field
The invention relates to the technical field of prevention and control of soil pollution sources, in particular to a method for checking hidden danger of soil pollution for identifying leakage of an underground storage tank.
Background
The law and regulation of soil pollution control method, action plan for soil pollution control and soil environment management method for construction sites are issued in China, and the daily environment management of pollution sources is definitely enhanced, so that the soil pollution prevention work is well done. Therefore, a series of technical guidelines are issued for the aspects of hidden trouble investigation of important supervision units of soil environment, self-monitoring of soil and underground water of industrial enterprises, self-monitoring of pollution discharge units and the like in China, and how the enterprises develop hidden trouble investigation and self-monitoring work is standardized.
Leakage of underground storage tanks in the production process of petrochemical enterprises can cause great environmental hidden trouble to soil and underground water, and potential pollutants leaked by the underground storage tanks are volatile organic matters. The investigation guide (trial) of hidden danger of soil pollution of key supervision units prescribes the range of hidden danger investigation, but the method for hidden danger investigation is mainly based on data auditing and on-site inspection. However, in view of the concealment of leakage from underground storage tanks, monitoring of the medium in the underground environment (soil, groundwater, etc.) can better determine whether leakage has occurred.
The technical guidelines for self-monitoring which are currently released in China and are suitable for petrochemical enterprises comprise industrial enterprise soil and underground water self-monitoring technical guidelines (trial run) (HJ 1209-2021), pollution discharge unit self-monitoring technical guideline oil storage warehouse, gas station (HJ 1249-2022), pollution discharge unit self-monitoring technical guideline petrochemical industry (HJ 947-2018), pollution discharge unit self-monitoring technical guideline petroleum refining industry (HJ 880-2017) and the like, and the technical guidelines prescribe the monitoring of environmental media such as soil, underground water, waste gas, ambient air, surface water, noise and the like.
Leakage of underground storage tanks from petrochemical enterprises can lead to soil and groundwater pollution, but the following difficulties exist in developing soil monitoring during enterprise production: (1) Because of the space difference of the soil properties, the migration path of the pollutants in the horizontal direction in the soil has larger randomness, and the feasibility of knowing the pollution condition in the factory of the enterprise only through soil sampling is not large under the condition that the grid distribution and the precursors of mass sampling are not carried out; (2) The surface of most areas in the factory area of the enterprise is hardened by cement, and soil samples are collected by drilling, so that the monitoring cost is high, the hardened pavement is required to be destroyed every time, and the production activity of the enterprise is influenced; (3) Whereas potential contaminants of petrochemical enterprise soil and groundwater are Volatile Organics (VOCs), they form a gas-liquid-solid three-phase equilibrium between soil pores, pore water and soil particles by phase partition; therefore, the soil gas monitoring can judge whether the soil and the underground water in the factory area of the enterprise are polluted by leakage or not. Compared with active soil gas monitoring, the emerging passive sampling technology at home and abroad has the advantages of simple operation, low cost, small volume and the like, and has more application potential for monitoring and evaluating the leakage of the underground storage tank of a production enterprise.
Disclosure of Invention
In order to solve the problems, the invention provides a soil pollution hidden trouble investigation method for identifying leakage of an underground storage tank.
The technical scheme of the invention is as follows: a method for identifying hidden danger of soil pollution caused by leakage of an underground storage tank comprises the following steps:
S1, acquiring storage tank information:
Acquiring storage tank information of a factory to be inspected, wherein the storage tank information comprises positions of an underground storage tank region and a non-underground storage tank region, landfill depth of the underground storage tank and chemical substances in the underground storage tank; the non-underground storage tank region refers to a non-underground storage tank region and a non-overground storage tank region in a factory; the chemical substance is a volatile organic compound;
when the chemical substances in the underground storage tank only contain benzene series in volatile organic compounds, a passive sampler of a solvent extraction type adsorption material is adopted; when the chemical substances in the underground storage tank contain other substances in the volatile organic compounds, a passive sampler of a thermal desorption type adsorption material is adopted;
S2, arranging monitoring points:
Taking chemical substances in an underground storage tank as target pollutants, respectively arranging a plurality of soil gas monitoring points in the non-underground storage tank area and the underground storage tank area in the step S1, and sampling and monitoring; each soil gas monitoring point comprises one or more shallow permanent monitoring holes and one or more deep permanent monitoring holes;
S3, determining the content of target pollutants:
During primary monitoring, collecting soil gas samples of monitoring points of all non-underground storage tank areas in the step S3, respectively taking the soil gas samples obtained from the shallow permanent monitoring holes and the deep permanent monitoring holes as shallow samples and deep samples for statistics, and determining the shallow soil gas target pollutant content and the deep soil gas target pollutant content of the non-underground storage tank areas through statistics;
The statistical determination method comprises the following steps: when the number of samples of the shallow layer samples or the deep layer samples is less than or equal to 10, taking the average value or 50% quantile of sample data as the target pollutant content of the shallow layer/deep layer soil gas;
When the number of the samples of the shallow layer samples or the deep layer samples is more than 10, the corresponding soil gas target pollutant content adopts 95% confidence level of the average value of the pollutant content of each soil gas monitoring point or carries out weighted average value calculation according to the area represented by the soil gas monitoring point to obtain the shallow layer/deep layer soil gas target pollutant content;
S4, judging leakage:
carrying out soil gas monitoring on an underground storage tank area once a month to obtain the content of a soil gas sample, and primarily judging whether the underground storage tank has hidden danger and a leakage position under the 95% confidence level, if the hidden danger exists, carrying out secondary judgment to confirm whether the underground storage tank leaks, and if the hidden danger does not exist, not needing secondary judgment;
The method for preliminarily judging whether the underground storage tank has hidden leakage trouble or not and the leakage position comprises the following steps:
Collecting soil gas samples of monitoring points of all underground storage tank areas in the step S2, and when the shallow sample content of the monitoring points in the underground storage tank areas is obviously different from the shallow soil gas target pollutant content of the non-underground storage tank areas determined in the step S3 and the deep sample content is not obviously different from the deep soil target pollutant content determined in the step S3, primarily recognizing the monitoring points to judge that the underground storage tank has hidden danger of leakage, wherein the leakage position of the underground storage tank is at the upper part of the underground storage tank;
When the shallow layer sample with the monitoring point in the underground storage tank area has obvious difference with the shallow layer soil gas target pollutant content, and the deep layer sample content of the monitoring point has obvious difference with the deep layer soil target pollutant content; preliminarily determining that the underground storage tank at the monitoring point has hidden leakage trouble, and the leakage position of the underground storage tank is at the bottom of the underground storage tank;
Otherwise, the underground storage tank is indicated to have no hidden trouble;
The secondary judging and confirming method for whether the underground storage tank leaks or not comprises the following steps:
Taking the soil gas sample content as a vertical axis and the time as a horizontal axis, and making a monitoring data trend line;
If the slope of the trend line of the monitoring data is larger than 0 for at least 3 times continuously on the same monitoring point, indicating that the leakage of the underground storage tank exists at the point, starting soil investigation and/or underground water monitoring according to the leakage position, and confirming whether the leakage occurs or not;
if the slope of the trend line of the monitoring data is 0 at least 3 times continuously on the same monitoring point, indicating that no underground storage tank leakage exists at the point;
If the slope of the trend line of at least 3 times in succession is smaller than 0 on the same monitoring point, the point is indicated that no underground storage tank leakage exists and biodegradation exists.
Description: according to the method, the underground soil can be passively monitored at any time through the arrangement of the monitoring points, so that whether the underground storage tank leaks or not can be judged and detected in time, and normal production activities of enterprises are not affected; the soil gas passive monitoring operation is simple and convenient, the cost is low, and continuous repeated monitoring can be carried out under the condition of the same cost, so that the leakage of the underground storage tank can be found in time; the daily monitoring of the underground storage tank can be controlled through the determination and the primary and secondary judgment of the content of the target pollutants, the obtained leakage check result is accurate, and frequent operation of soil sampling and underground water check is avoided, so that the personnel operation pressure is reduced while the accurate monitoring and judgment are realized, and meanwhile, the phase distribution effect of soil and underground water in petrochemical enterprises, which is volatile pollution organic matters, can be solved, and the gas-liquid-solid three-phase balance is formed among soil pores, pore water and soil particles; the problem that the leakage position is difficult to accurately monitor and check is caused. By the method for primarily judging hidden danger, the difference of the contents of the underground storage tank area and the non-underground storage tank area can be used as the basis of the hidden danger of whether leakage of chemical pollutants possibly exists, so that the phenomenon that the pollutants in the factory have a certain background concentration and influence on the result of judging whether leakage exists is avoided.
Further, in step S4, the method for starting soil investigation and/or groundwater monitoring to confirm whether leakage occurs according to the leakage position includes:
when the leakage position is at the upper part of the underground storage tank, carrying out soil investigation to carry out final judgment; the soil investigation is as follows: sampling and detecting the soil of the monitoring point, wherein leakage occurs when the detection value of the chemical substances in the soil exceeds the standard, and leakage does not occur when the detection value of the chemical substances does not exceed the standard;
When the leakage position is at the bottom of the underground storage tank, monitoring underground water to finally judge; the groundwater monitoring is as follows: and detecting chemical substances in the underground water of the monitoring point, and when the chemical substances are detected to exceed the standard, leaking the bottom of the storage tank.
Description: by setting the leakage position and the corresponding coping method thereof in the above manner, the accuracy of hidden danger processing coping can be improved.
Further, in step S4, according to the paired data t-test method, it is determined whether there is a significant difference between the paired data t-test method and the paired data t-test method, if the obtained t-value is smaller than the critical value α, there is no significant difference between the average values of the data, and if the obtained t-value is greater than the critical value α, there is a significant difference between the paired data t-test method and the paired data t-test method; where α=0.05.
Description: according to the method, the paired data t-test method is utilized to calculate the quantization indexes of the significant differences, and the obtained result is more accurate.
Further, the shallow permanent monitoring holes are arranged at a position 0.5m away from the ground surface, the deep permanent monitoring holes are arranged within a range of 1.0m by taking the shallow permanent monitoring holes as the center, the bottom surface of the deep permanent monitoring holes is 0.5-1.5 m away from the bottom of the underground storage tank, and the bottom of the underground storage tank is higher than the groundwater aquifer.
Description: above-mentioned setting can lay to the underground storage tank, makes comparatively accurate layout coverage according to the flowable volatility of chemical pollutant.
The structure for the soil pollution hidden trouble investigation method for identifying the leakage of the underground storage tank comprises a shallow permanent monitoring hole and a deep permanent monitoring hole, wherein the diameters of the shallow permanent monitoring hole and the deep permanent monitoring hole are 5-7 cm, a sleeve is arranged on the inner wall of the monitoring hole, and a slit with the width of 1-5 mm is arranged on the side wall of the sleeve.
The sleeve is made of stainless steel pipes or water supply grade PVC pipes.
Description: the sleeve can play a role in supporting and fixing the monitoring hole, and volatile organic compounds in the soil gas enter the monitoring hole through the slit.
Further, the top of the shallow permanent monitoring hole and the top of the deep permanent monitoring hole are gas sampling ports which are arranged in a sealing way and are provided with gas tightness valves, and the bottoms of the shallow permanent monitoring hole and the deep permanent monitoring hole are provided with pipe caps which are used for preventing peripheral soil from entering the monitoring hole from the bottom.
Description: the pipe cap can prevent the surrounding soil from collapsing and entering the monitoring hole from the bottom.
When the underground storage tank leakage is not sampled, PID, FID and methane monitoring are carried out in the shallow permanent monitoring holes and the deep permanent monitoring holes every week, and when the monitoring result continuously rises for two weeks, soil gas monitoring point sampling is started to judge; during sampling, the upper part in the deep permanent monitoring hole is provided with a plurality of layers of sealing expansion materials.
Description: the daily monitoring can monitor whether the underground has potential safety hazards in real time, and the multilayer sealing expansion materials can ensure that the collected soil gas sample is at the target depth.
The beneficial effects of the invention are as follows:
According to the invention, the underground soil gas can be passively monitored at any time through the arrangement of the monitoring points, so that whether the underground storage tank leaks or not can be timely judged and detected, and the normal production activity of an enterprise is not influenced; because the soil gas passive monitoring operation is simple and convenient and the cost is low, continuous repeated monitoring can be carried out under the condition of the same cost, so that leakage of the underground storage tank can be found in time; through the determination, preliminary judgment and secondary judgment of the content of the target pollutant, the daily monitoring of the underground storage tank can be controlled, the obtained leakage check result is accurate, frequent operation of soil sampling and underground water check is avoided, and therefore the safety hidden danger check of flammable and explosive gas such as underground methane and the like can be realized, the operating pressure of personnel is relieved while the accurate monitoring and judgment are realized.
Drawings
FIG. 1 is a plan view of a factory floor area of an embodiment 1 of the invention; in the figure, SSG represents shallow soil gas, DSG represents deep soil gas, and BSG represents soil gas in a non-underground storage tank region;
FIG. 2 is a schematic diagram of the working principle of the present invention;
FIG. 3 is a data diagram of example 1 of the present invention.
Detailed Description
The invention will be described in further detail with reference to the following embodiments to better embody the advantages of the invention.
Example 1:
As shown in fig. 1, in the case of a petrochemical enterprise in north China, the monitoring index is volatile organic benzene, and the units are in micrograms; a method for identifying hidden danger of soil pollution caused by leakage of an underground storage tank comprises the following steps:
S1, acquiring storage tank information:
Acquiring storage tank information of a factory to be inspected, wherein the storage tank information comprises positions of an underground storage tank region and a non-underground storage tank region, landfill depth of the underground storage tank and chemical substances in the underground storage tank; the chemical substance is benzene series; a Radiello passive sampler using a solvent-extracted adsorbent material;
S2, arranging monitoring points:
Taking chemical substances in an underground storage tank as target pollutants, respectively arranging a plurality of soil gas monitoring points in the non-underground storage tank area and the underground storage tank area in the step S1, and collecting and monitoring soil gas samples in 14 days; the soil gas monitoring points comprise a plurality of shallow permanent monitoring holes and deep permanent monitoring holes;
The shallow permanent monitoring holes are distributed at a position 0.5m away from the ground surface, the deep permanent monitoring holes are distributed within a range of 1.0m by taking the shallow permanent monitoring holes as the center, the bottom surface of the deep permanent monitoring holes is 1m away from the bottom of the underground storage tank, and the bottom of the underground storage tank is positioned above the groundwater aquifer;
The diameters of the shallow permanent monitoring holes and the deep permanent monitoring holes are 6cm, the inner walls of the monitoring holes are provided with sleeves, and the side walls of the sleeves are provided with slots with the width of 3 mm; the sleeve is made of stainless steel tubes; the top parts of the shallow permanent monitoring holes and the deep permanent monitoring holes are gas sampling ports which are arranged in a sealing way and are provided with airtight valves; the bottoms of the shallow permanent monitoring holes and the deep permanent monitoring holes are provided with pipe caps for preventing peripheral soil from entering the monitoring holes from the bottom;
13 soil gas monitoring points are distributed in a non-underground storage tank area, each monitoring point comprises 1 shallow permanent monitoring hole and 1 deep permanent monitoring hole, and 12 deep soil gas monitoring points and 9 shallow soil gas monitoring points are distributed in the underground storage tank area;
S3, determining the content of target pollutants:
During primary monitoring, collecting soil gas samples of monitoring points of all non-underground storage tank areas in the step S3, respectively taking the soil gas samples obtained from the shallow permanent monitoring holes and the deep permanent monitoring holes as shallow samples and deep samples for statistics, and determining the shallow soil gas target pollutant content and the deep soil gas target pollutant content of the non-underground storage tank areas through statistics; the statistical determination method comprises the following steps: the number of the shallow/deep samples is 8, so that the average value of the sample data is used as the gas target pollutant content of the shallow/deep soil; obtaining shallow and deep soil gas target benzene contents of 2.3 micrograms and 4.0 micrograms respectively;
S4, judging leakage:
as shown in table 1, two shallow soil air monitoring holes and one deep soil air monitoring hole were selected,
As shown in fig. 3 and table 1, wherein DSG2 corresponds to case 1 in fig. 3, dgs6 corresponds to case 2 in fig. 2, ssg2 corresponds to case 3 in fig. 3;
obtaining monitoring data of case 2 and case 3 by using shallow soil gas monitoring holes, and obtaining monitoring data of case 1 by using deep soil gas monitoring holes; then, a judgment is made that,
Under the 95% confidence level, the hidden danger of leakage of the underground storage tank of the deep monitoring hole is primarily judged,
The content of the deep sample in the case 1 is obviously different from the content of the target pollutant in the deep soil, the t value is larger than the critical value alpha, secondary judgment is carried out, as shown in figure 3, the slope of a trend line of monitoring data is larger than 0 at least 3 times continuously, the situation that the underground storage tank leaks at the monitoring point, the leakage position is at the bottom of the underground storage tank is indicated, final judgment is carried out by monitoring the underground water, and the bottom of the storage tank is found to be truly leaked;
the case 2 shows that the soil gas and benzene content in the 6 monitoring results fluctuates around 1.2 micrograms, and has no obvious difference with the target pollutant content of the shallow soil; primarily judging that the monitoring point position has no hidden trouble of leakage of the underground storage tank, secondarily judging that the slope of a trend line of continuous 3 times of monitoring data is 0, and indicating that the monitoring point has no hidden trouble of leakage of the underground storage tank;
as shown in case 3, the content of the soil gas and benzene in the 6 monitoring results is continuously reduced from 4 micrograms to 1.9 micrograms, and the soil gas and benzene is obviously different from the content of the target pollutants in the shallow soil, so that the hidden danger of leakage of the underground storage tank in the monitoring point position is primarily judged; and carrying out secondary judgment, wherein the slope of a continuous 3-time data trend line is smaller than 0, which indicates that no underground storage tank leakage exists at the point, the biodegradation is relatively more in contact with the surface convection, and benzene is easy to biodegrade under the aerobic condition.
Table 1 case site monitoring data (Unit: μg)
| Case numbering | 1 St time | 2 Nd time | 3 Rd time | Fourth time | 5 Th time | Last time (6) |
| Case 1 | 2.1 | 4.1 | 10.2 | 15.1 | 28.9 | 38.1 |
| Case 2 | 1.5 | 1.2 | 1.0 | 0.9 | 1.1 | 1.0 |
| Case 3 | 4.0 | 3.5 | 2.3 | 1.8 | 2.0 | 1.9 |
Example 2
The embodiment is different from embodiment 1 in that the shallow permanent monitoring holes are arranged at a position 0.5m away from the ground surface, the deep permanent monitoring holes are arranged within a range of 1.0m by taking the shallow permanent monitoring holes as the center, the bottom surface of the deep permanent monitoring holes is 1.5m away from the bottom of the underground storage tank, and the bottom of the underground storage tank is higher than the underground water-bearing layer; the diameters of the shallow permanent monitoring holes and the deep permanent monitoring holes are 7cm, the inner walls of the monitoring holes are provided with sleeves, and the side walls of the sleeves are provided with slots with the width of 1 mm; the sleeve adopts a water supply grade PVC pipe;
Taking 12 samples of deep samples, adopting 95% confidence level of the average value of the pollutant content of each soil gas monitoring point, and adopting US EPA software ProUCL 5.3.3 to respectively calculate UCL values as the target benzene content of the soil gas to obtain shallow and deep soil gas target pollutant contents of 2.5 micrograms and 4.5 micrograms respectively;
example 3
The difference between this example and example 1 is that the chemical substance is chlorinated hydrocarbon, and a passive sampler of thermal desorption type adsorption material is used and commercially available is selected; the shallow permanent monitoring holes are distributed at a position 0.5m away from the ground surface, the deep permanent monitoring holes are distributed within a range of 1.0m by taking the shallow permanent monitoring holes as the center, the bottom surface of the deep permanent monitoring holes is 0.5m away from the bottom of an underground storage tank, and the bottom of the underground storage tank is higher than a water-bearing layer of underground water; the diameters of the shallow permanent monitoring holes and the deep permanent monitoring holes are 5cm, the inner walls of the monitoring holes are provided with sleeves, and the side walls of the sleeves are provided with slots with the width of 5 mm; the sleeve is made of stainless steel tubes.
Example 4
When the underground storage tank leakage is not sampled, PID, FID and methane monitoring are carried out in the shallow permanent monitoring holes and the deep permanent monitoring holes every week, and when the monitoring result continuously rises for two weeks, soil gas monitoring point sampling is started to judge; during sampling, the upper part in the deep permanent monitoring hole is provided with a plurality of layers of sealing expansion materials, and the sealing expansion materials are commercially available expansion rubber.
Claims (8)
1. The method for identifying the hidden trouble of soil pollution caused by leakage of the underground storage tank is characterized by comprising the following steps of:
S1, acquiring storage tank information:
Acquiring storage tank information of a factory to be inspected, wherein the storage tank information comprises positions of an underground storage tank region and a non-underground storage tank region, landfill depth of the underground storage tank and chemical substances in the underground storage tank; the chemical substance is a volatile organic compound;
S2, arranging monitoring points:
Taking chemical substances in an underground storage tank as target pollutants, respectively arranging a plurality of soil gas monitoring points in the non-underground storage tank area and the underground storage tank area in the step S1, and sampling and monitoring; each soil gas monitoring point comprises one or more shallow permanent monitoring holes and one or more deep permanent monitoring holes;
S3, determining the content of target pollutants:
During primary monitoring, collecting soil gas samples of monitoring points of all non-underground storage tank areas in the step S3, respectively taking the soil gas samples obtained from the shallow permanent monitoring holes and the deep permanent monitoring holes as shallow samples and deep samples for statistics, and determining the shallow soil gas target pollutant content and the deep soil gas target pollutant content of the non-underground storage tank areas through statistics;
S4, judging leakage:
Carrying out soil gas monitoring on an underground storage tank area once a month to obtain the content of a soil gas sample, and primarily judging whether the underground storage tank has hidden danger of leakage and the leakage position under the 95% confidence level, if the hidden danger exists, carrying out secondary judgment to confirm whether the underground storage tank leaks, and if the hidden danger does not exist, not needing secondary judgment;
in step S4, the method for preliminarily judging whether the underground storage tank has hidden leakage trouble or not and the leakage position is as follows:
Collecting soil gas samples of monitoring points of all underground storage tank areas in the step S2, and when the shallow sample content of the monitoring points in the underground storage tank areas is obviously different from the shallow soil gas target pollutant content of the non-underground storage tank areas determined in the step S3 and the deep sample content is not obviously different from the deep soil target pollutant content determined in the step S3, primarily recognizing the monitoring points to judge that the underground storage tank has hidden danger of leakage, wherein the leakage position of the underground storage tank is at the upper part of the underground storage tank;
When the shallow layer sample with the monitoring point in the underground storage tank area has obvious difference with the shallow layer soil gas target pollutant content, and the deep layer sample content of the monitoring point has obvious difference with the deep layer soil target pollutant content; preliminarily determining that the underground storage tank at the monitoring point has hidden leakage trouble, and the leakage position of the underground storage tank is at the bottom of the underground storage tank;
Otherwise, the underground storage tank is indicated to have no hidden trouble;
in step S4, the method for secondarily judging and confirming whether the underground storage tank leaks or not includes:
Taking the soil gas sample content as a vertical axis and the time as a horizontal axis, and making a monitoring data trend line;
If the slope of the trend line of the monitoring data is larger than 0 for at least 3 times continuously on the same monitoring point, indicating that the leakage of the underground storage tank exists at the point, starting soil investigation and/or underground water monitoring according to the leakage position, and confirming whether the leakage occurs or not;
if the slope of the trend line of the monitoring data is 0 at least 3 times continuously on the same monitoring point, indicating that no underground storage tank leakage exists at the point;
If the slope of the trend line of at least 3 times in succession is smaller than 0 on the same monitoring point, the point is indicated that no underground storage tank leakage exists and biodegradation exists.
2. The method for checking hidden danger of soil pollution for identifying leakage of an underground storage tank according to claim 1, wherein in step S2, a passive sampler is used in the sampling process, and the method for selecting the passive sampler is as follows: when the chemical substances in the underground storage tank only contain benzene series in volatile organic compounds, a passive sampler of a solvent extraction type adsorption material is adopted;
When the chemical substances in the underground storage tank contain other substances in the volatile organic compounds, a passive sampler of thermal desorption type adsorption materials is adopted.
3. The method for inspecting hidden danger of soil pollution for identifying leakage of an underground storage tank according to claim 1, wherein in step S3, the statistical determination method is as follows: when the number of samples of the shallow layer samples or the deep layer samples is less than or equal to 10, taking the average value or 50% quantile of sample data as the target pollutant content of the shallow layer/deep layer soil gas;
when the number of the samples of the shallow layer samples or the deep layer samples is more than 10, the corresponding soil gas target pollutant content adopts the 95% confidence level of the average value of the pollutant content of each soil gas monitoring point or carries out weighted average value calculation according to the area represented by the soil gas monitoring point, so as to obtain the shallow layer/deep layer soil gas target pollutant content.
4. The method for detecting hidden danger of soil pollution for recognizing leakage of underground storage tank according to claim 1, wherein in step S4, the method for starting soil detection and/or groundwater monitoring to confirm whether leakage occurs according to the leakage position comprises:
when the leakage position is at the upper part of the underground storage tank, carrying out soil investigation to carry out final judgment; the soil investigation is as follows: sampling and detecting the soil of the monitoring point, wherein leakage occurs when the detection value of the chemical substances in the soil exceeds the standard, and leakage does not occur when the detection value of the chemical substances does not exceed the standard;
When the leakage position is at the bottom of the underground storage tank, monitoring underground water to finally judge; the groundwater monitoring is as follows: and detecting chemical substances in the underground water of the monitoring point, and when the chemical substances are detected to exceed the standard, leaking the bottom of the storage tank.
5. The method for checking hidden danger of soil pollution for identifying leakage of an underground storage tank according to claim 1, wherein in step S4, according to a paired data t-test method, it is judged whether there is a significant difference between the two, if t-value is smaller than a critical value α, there is no significant difference in the mean value of the data, and if t-value is greater than a critical value α, there is a significant difference; where α=0.05.
6. The method for checking hidden danger of soil pollution for identifying leakage of an underground storage tank according to claim 1, wherein the shallow permanent monitoring holes are arranged at a position 0.5m away from the ground surface, the deep permanent monitoring holes are arranged within a range of 1.0m with the shallow permanent monitoring holes as the center, the bottom surface of the deep permanent monitoring holes is 0.5-1.5 m away from the bottom of the underground storage tank, and the bottom of the underground storage tank is higher than an underground water-containing layer; the diameters of the shallow permanent monitoring holes and the deep permanent monitoring holes are 5-7 cm, the inner walls of the monitoring holes are provided with sleeves, and the side walls of the sleeves are provided with slots with the width of 1-5 mm.
7. The method for inspecting hidden danger of soil pollution for recognizing leakage of underground storage tank according to claim 6, wherein the top parts of the shallow permanent monitoring holes and the deep permanent monitoring holes are gas sampling ports which are arranged in a sealing way and are provided with airtight valves, and the bottoms of the shallow permanent monitoring holes and the deep permanent monitoring holes are provided with pipe caps for preventing peripheral soil from entering the monitoring holes from the bottom.
8. The method for detecting hidden danger of soil pollution for identifying leakage of an underground storage tank according to any one of claims 1 to 7, wherein the method is characterized in that the monitoring of PID, FID and methane is carried out in a shallow permanent monitoring hole and a deep permanent monitoring hole every week when the method is not used for sampling, and when the monitoring result is continuously increased for two weeks, a soil gas monitoring point is required to be started for passive sampling for judgment; during sampling, the upper part in the deep permanent monitoring hole is provided with a plurality of layers of sealing expansion materials.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170099491A (en) * | 2016-02-24 | 2017-09-01 | (주)엔지오스 | Groundwater level monitoring of soil and oil leakage detection system |
| CN108050396A (en) * | 2016-12-28 | 2018-05-18 | 吉林省百瑞生科技发展有限公司 | A kind of fluid line source of leaks monitoring and positioning system and method |
| KR20200102134A (en) * | 2019-02-21 | 2020-08-31 | (주)동명엔터프라이즈 | Soil pollution monitoring method by fuel leakage of underground facility |
| CN113498478A (en) * | 2019-03-21 | 2021-10-12 | 株式会社晓林 | Real-time underground volatile organic compound leakage detection system |
| CN116929674A (en) * | 2023-07-24 | 2023-10-24 | 广州珠江天然气发电有限公司 | Leakage point investigation method and device for vacuum tightness test |
-
2023
- 2023-11-03 CN CN202311454399.6A patent/CN117516814B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170099491A (en) * | 2016-02-24 | 2017-09-01 | (주)엔지오스 | Groundwater level monitoring of soil and oil leakage detection system |
| CN108050396A (en) * | 2016-12-28 | 2018-05-18 | 吉林省百瑞生科技发展有限公司 | A kind of fluid line source of leaks monitoring and positioning system and method |
| KR20200102134A (en) * | 2019-02-21 | 2020-08-31 | (주)동명엔터프라이즈 | Soil pollution monitoring method by fuel leakage of underground facility |
| CN113498478A (en) * | 2019-03-21 | 2021-10-12 | 株式会社晓林 | Real-time underground volatile organic compound leakage detection system |
| CN116929674A (en) * | 2023-07-24 | 2023-10-24 | 广州珠江天然气发电有限公司 | Leakage point investigation method and device for vacuum tightness test |
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