CN115933003A - Method for acquiring underground water pollution condition of flat terrain refuse landfill - Google Patents
Method for acquiring underground water pollution condition of flat terrain refuse landfill Download PDFInfo
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Abstract
The invention relates to a method for acquiring a groundwater pollution condition of a plain terrain refuse landfill, which comprises the following steps: acquiring possible leakage areas around the refuse landfill, and acquiring the pollutant concentration of the leakage areas at a plurality of set positions through drilling; geophysical detection is adopted for geophysical detection, a suspected polluted area is identified according to geophysical detection parameters obtained by geophysical detection, and a quantitative relation between the geophysical detection parameters and the pollutant concentrations is established according to the pollutant concentrations at a plurality of set positions and corresponding geophysical detection parameters; determining a geophysical prospecting parameter threshold value according to the critical pollutant concentration and the quantitative relation; and identifying the suspected polluted area according to the geophysical prospecting parameter threshold value, and determining the range of the polluted area. And performing stationing drilling in the determined polluted area to obtain the pollutant information.
Description
Technical Field
The invention relates to the technical field of pollution site investigation, in particular to a method for acquiring a sewage pollution condition of a plain terrain refuse landfill site.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Groundwater is an important component of water resource systems, and in recent years, with the continuous development of society, more and more people begin to pay attention to ecological safety problems and environmental health risks caused by groundwater pollution.
The treatment mode of domestic waste mainly takes landfill as the main, and landfill site has landfill body landslide, landfill gas loss and leachate seepage scheduling problem, can cause pollution of different degrees to landfill site and peripheral groundwater soil, because groundwater pollution has characteristics such as being difficult to perceive, difficult to restore, and polluted groundwater can endanger human health when being used as drinking water source, consequently need investigate the landfill site urgently, aassessment its pollution risk to groundwater environment.
At present, the initial survey of the refuse landfill is mainly based on the traditional drilling method, the method needs to carry out the point distribution drilling of a plurality of point positions, and the leakage area is easy to miss due to the discontinuity of the space, so that the pollution situation of the refuse landfill to the underground water cannot be integrally known.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a method for acquiring the underground water pollution condition of the plain terrain refuse landfill, and solves the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme
The embodiment of the invention provides a method for acquiring a sewage pollution condition of a plain terrain refuse landfill site, which comprises the following steps:
acquiring a possible leakage area around the refuse landfill, and acquiring the pollutant concentration of the leakage area at a plurality of set positions through drilling;
geophysical detection is adopted for geophysical detection, a suspected polluted area is identified according to geophysical detection parameters obtained by geophysical detection, and a quantitative relation between the geophysical detection parameters and the pollutant concentrations is established according to the pollutant concentrations at a plurality of set positions and corresponding geophysical detection parameters;
determining a geophysical prospecting parameter threshold value according to the critical pollutant concentration and the quantitative relation;
and identifying the suspected polluted area according to the geophysical prospecting parameter threshold value, and determining the range of the polluted area.
And performing point placement drilling in the determined polluted area to acquire pollutant information.
Optionally, the method for identifying suspected contaminated areas includes the following steps:
performing geophysical detection according to the determined geophysical detection method to obtain original geophysical parameter data;
carrying out data processing and inversion interpretation on the original geophysical prospecting parameter data;
and determining a suspected pollution area according to the inversion result.
Optionally, the processed original data is inverted to obtain a geophysical prospecting parameter profile, and a pollution leakage position and a pollution plume diffusion range are determined according to the numerical value and the trend of the resistivity and polarizability abnormal region on the geophysical prospecting parameter profile, so as to identify a suspected pollution region.
Optionally, the geophysical detection method combines a high-density resistivity method with an induced polarization method.
Optionally, a plurality of drilling points are arranged in an area around the landfill where leakage may exist, and pollutant concentration information is obtained after drilling.
Optionally, the drill holes at the same drill hole point acquire the pollutant concentration information at different depths.
Optionally, during geophysical exploration, survey lines are arranged around the landfill along a direction perpendicular to the flow direction of the groundwater and a direction parallel to the flow direction of the groundwater.
Alternatively, the groundwater flow is obtained by drilling through the borehole site in an area where there may be a leak.
Optionally, in the suspected contaminated area, the determined contaminated area is determined according to a comparison result between a geophysical exploration parameter obtained by geophysical exploration and a geophysical exploration parameter threshold.
Optionally, a stationing position is determined in the determined pollution area range according to the geophysical inversion profile detected by the geophysical method, drilling is performed at the stationing position to obtain the pollutant concentration, and the pollution area identification result is verified.
The invention has the beneficial effects that:
according to the method, a suspected pollution area is identified by using a geophysical detection method, then initial drilling is combined for drilling, a quantitative relation between a geophysical detection method geophysical parameter and pollutant concentration is established, a geophysical parameter threshold value is obtained according to the obtained quantitative relation and the critical pollutant concentration set by the refuse landfill, the suspected pollution area can be defined through the geophysical parameter of the suspected pollution area, the pollution area is identified, the pollution condition judged through the pollutant concentration can be converted into the pollution condition judged through the geophysical parameter, the position of point distribution drilling is more targeted, the defect that a leakage area is easy to miss is overcome, the underground water pollution condition of the suspected refuse landfill can be conveniently recognized from the whole due to the fact that the point distribution drilling is carried out on the whole area, pollutant information is obtained only through the determined position of the pollution area, the precision of preliminary pollution survey is improved, and the underground water environment condition of the refuse landfill can be comprehensively and quickly obtained.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic flow chart of a method according to example 1 of the present invention;
FIG. 2 is a schematic view of a line profile in example 1 of the present invention;
Detailed Description
Example 1
The embodiment provides a method for acquiring a water pollution condition of a flat terrain refuse landfill site, as shown in fig. 1, the method includes the following steps:
step 1: acquiring possible leakage areas around the landfill site, and acquiring the pollutant concentration of the leakage areas at a plurality of set positions through drilling.
Specifically, the possible existence of the seepage areas is determined according to a first stage site environment survey recorded by the HJ25.1-2014 site environment survey technical guide, and relevant data is obtained through the site survey, wherein the site survey comprises data collection, site survey and personnel interview.
Specifically, when collecting data of a landfill, it is required to ensure the collection of basic data and collect auxiliary data as much as possible. And then, the collected data are sorted and analyzed, and the basic geology, hydrogeology, underground water environment supervision conditions and the like of the refuse landfill are determined. The accuracy of collected data is verified in site reconnaissance, the landfill leachate treatment area and the environment sensitive area are mainly reconnaissance, and whether geophysical exploration can be carried out or not is determined according to the landform and the landform.
In this embodiment, the collected basic data includes the quality status of groundwater (such as turbidity, pH, total coliform group, nitrate), the type of landfill, the treatment method of leachate, the designed storage capacity of the landfill, the seepage prevention condition, and the like. The auxiliary data comprises pollutant types, environmental protection facility construction conditions and main mining positions of the water source well.
The site reconnaissance method is to distinguish the overproof conditions of various ionic components in the underground water environment of the site by observing and identifying abnormal odor or using site rapid detection equipment.
The method for determining the area where the leakage may exist may be an existing method, and will not be described in detail.
And arranging and setting drill holes in the possible leakage areas around the refuse landfill obtained in the step, wherein the positions and the number of the drill holes can be set according to actual conditions.
And drilling through the drill hole to obtain the groundwater flow direction and pollutant concentration information of the refuse landfill.
Step 2: geophysical detection is adopted for geophysical detection, a suspected polluted area is identified according to geophysical detection parameters obtained by geophysical detection, and a quantitative relation between the geophysical detection parameters and the pollutant concentrations is established according to the pollutant concentrations at a plurality of set positions and the corresponding geophysical detection parameters.
The plain area has no large topographic relief, the change of the stratum deposition environment is relatively simple, and the flow velocity and the flow direction of the underground water have no mutation, so that the land physical method is suitable for carrying out preliminary survey and mastering the basic information of the underground water environment.
Specifically, the geophysical detection method in this embodiment adopts a method in which a high-density resistivity method and an induced polarization method are combined.
For the adopted geophysical detection method, a wiring method is uniformly adopted: during wiring, the hardened road surface is avoided as much as possible, and the detection electrode is in direct contact with soil.
The specific principle of wiring is as follows:
the short axis direction of the refuse landfill is set as the width direction, the maximum distance is x, the long axis direction is the length direction, and the maximum distance is y. If x or y is less than or equal to 60m, taking x is less than or equal to 60m as an example, the layout of the measuring line is determined according to the following formula:
in the formula: l is a radical of an alcohol i -a survey line; x is the number of i -the distance of the survey line from the landfill site. And if x and y are smaller than 60m at the same time, performing layout arrangement of the measuring lines on the basis of the smaller value of the x and y.
Under the allowable conditions of site space and terrain, 3 measuring lines L are arranged perpendicular to the flow direction of underground water at the downstream of the flow direction of underground water in the landfill site 1 、L 2 And L 3 Monitoring the distribution and diffusion conditions of pollution plumes; 1 measuring line L is respectively arranged on two sides of the refuse landfill in parallel to the flow direction of the underground water 4 And L 5 Monitoring the leakage condition of the pollutants; 1 measuring line L is arranged on the lower water flow direction upstream of the landfill site and is vertical to the flow direction of the underground water 6 And as an upstream comparison test line, acquiring a background value of the geophysical prospecting parameter.
If x, y >60m, the layout position of the measuring line is determined by the following formula:
wherein the direction of flow of the groundwater is determined from the drilling information in step 1.
In this embodiment, the maximum distance in the width direction is 50m, and the maximum distance in the length direction is 80m, which meet the first wiring situation, as shown in fig. 2, that is, 1 measuring line is respectively arranged at the positions close to the refuse landfill, 25m and 25 to 42m downstream of the groundwater flow, and perpendicular to the groundwater flow direction, and each measuring line is L 1 、L 2 And L 3 Monitoring the distribution and diffusion conditions of pollution plumes; at the positions of both sides of the refuse landfill 25-42 m away from the landfill, 1 measuring line is respectively arranged in the direction parallel to the underground water flow direction, and the measuring lines are L respectively 4 And L 5 Monitoring the leakage condition of the pollutants; 1 horizontal measuring line L is arranged at the position 25-42 m of the lower water flow direction upstream of the landfill site and is vertical to the flow direction of the underground water 6 And as an upstream comparison test line, obtaining a background value of the geophysical prospecting parameter, namely a background value corresponding to the resistivity parameter or a background value corresponding to the polarizability parameter.
In this embodiment, it is necessary to determine whether the arranged measurement lines are located within a range of 5 to 10m around the drill hole in step 1, and if not, the measurement lines need to be arranged within a range of 5 to 10m around the drill hole in step 1 to collect a data relationship, so that the subsequent establishment of a quantitative relationship between the geophysical prospecting parameters and the pollutant concentration is facilitated.
For the two wiring conditions, if the pollution plume is obviously diffused in four directions and a geophysical signal abnormality occurs, if the resistivity is obviously lower than the corresponding background value or the polarizability is obviously higher than the corresponding background value, the geophysical survey line is properly increased and encrypted.
When geophysical exploration is carried out, the existing instrument equipment is adopted, generally, high-density resistivity and induced polarization data are measured synchronously, the resistivity and the polarization rate are used as parameters to explain pollutant distribution, and the main working steps are as follows: arranging electrodes along a measuring line at a fixed polar distance, keeping the position fixed, connecting the electrodes to a measuring instrument through an electrode change-over switch, and arranging non-polarized electrodes in a parallel position which deviates from the electrodes by 0.5m to collect induced polarization signals. And the electrodes are converted by the electrode conversion switch to complete the geophysical exploration work of the refuse landfill. And after the measurement of one measuring line is finished, moving the whole electrode array, and carrying out the measurement of the next measuring line until all the measuring lines are completely measured.
The present embodiment is described by taking a quantitative relationship between the resistivity and the contaminant concentration as an example, that is, the physical parameters are resistivity:
specifically, the resistivity of different drill holes in the step 1 corresponding to different depths is obtained, and a quantitative relation between the resistivity and the pollutant concentration is established.
A fitting equation may be used to construct a quantitative relationship between the resistivity parameter and the contaminant concentration. And using a linear fitting formula y = ax + b, wherein a is a slope, b is an intercept, the dependent variable is the resistivity rho, and the independent variable is the pollutant concentration c, so that the relation between the resistivity parameter and the pollutant concentration is rho = ac + b. And determining a fitting formula according to the obtained relationship between the resistivity of different depths of the drill hole and the pollutant concentration and the relationship between the resistivity of different drill holes and the pollutant concentration.
According to the result of geophysical detection, a suspected polluted area is determined, and the method specifically comprises the following steps:
firstly, inputting original data in an instrument into computing software, arranging and converting the data into a file format which can be processed by a computer, carrying out a series of data processing operations such as checking, manually eliminating dead spots, terrain correction and the like during data arrangement, storing the processed data, and carrying out inversion interpretation by using electrical inversion software to obtain a geophysical prospecting parameter profile. And taking all areas with large resistivity and polarizability changes on the section as pollution leakage positions, and preliminarily identifying suspected pollution areas.
The method for determining the position of the contamination leakage comprises the steps of comparing the resistivity or the polarizability with a background value of the resistivity or the polarizability, and when the resistivity of a position is obviously lower than the background value corresponding to the resistivity (or the polarizability is higher than the background value corresponding to the polarizability), determining that the position is the position of the contamination leakage, and the position is a suspected contamination area within a range of 50m around the position.
And step 3: and (3) determining a resistivity value corresponding to the critical pollutant concentration, namely a resistivity threshold value according to the pollutant concentration and the field repair target value and the quantitative relation between the pollutant concentration and the resistivity value determined in the step (2).
And 4, step 4: and comparing the resistivity in the suspected polluted area with a resistivity threshold, and determining that the set area is the polluted area when the resistivity of the set area in the suspected polluted area is lower than the resistivity threshold, and determining the polluted area in the inner circle of the suspected polluted area by the analogy.
And 5: and (3) performing point distribution drilling in the polluted area to obtain pollutant information, completing preliminary investigation on the sewage pollution condition of the refuse landfill site, and verifying the identified polluted area.
The stationing drilling is as follows: the distribution position is determined by a geophysical inversion section of the defined pollution area and is mainly distributed in an electric signal abnormal area with obviously fluctuated resistivity or polarizability section so as to verify the geophysical result and acquire more pollutant information.
In this embodiment, the drilling depth is determined by geophysical inversion of the profile, typically with the aim of revealing the shallow underground aquifer without penetrating its water-barrier bottom plate. For different groundwater types, different numbers of monitoring points should be deployed: pore water is provided with 5-7 monitoring points, karst water is provided with at least 4 monitoring points, and fracture water is provided with at least 5-6 monitoring points.
By adopting the method of the embodiment, a set of complete method for acquiring the underground water pollution condition of the plain terrain refuse landfill site is designed, so that data and reference bases are provided for subsequent detailed investigation, and the efficiency of carrying out preliminary investigation on the underground water environment condition of the refuse landfill site is improved. The suspected contamination areas are identified in combination with geophysical prospecting methods to guide the determination of subsequent stationing locations, quantities and drilling depths. The accuracy of preliminary pollution survey is improved, the distribution quantity is effectively reduced, and the groundwater environment condition of the refuse landfill can be comprehensively and quickly acquired.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. A method for acquiring the underground pollution condition of a plain terrain refuse landfill site is characterized by comprising the following steps:
acquiring possible leakage areas around the refuse landfill, and acquiring the pollutant concentration of the leakage areas at a plurality of set positions through drilling;
geophysical detection is adopted for geophysical detection, a suspected polluted area is identified according to geophysical detection parameters obtained by geophysical detection, and a quantitative relation between the geophysical detection parameters and the pollutant concentrations is established according to the pollutant concentrations at a plurality of set positions and corresponding geophysical detection parameters;
determining a geophysical prospecting parameter threshold value according to the critical pollutant concentration and the quantitative relation;
and identifying the suspected polluted area according to the geophysical prospecting parameter threshold value, and determining the range of the polluted area.
And performing point placement drilling in the determined polluted area to acquire pollutant information.
2. The method for acquiring the water pollution condition of the flat terrain refuse landfill site as claimed in claim 1, wherein the method for identifying the suspected pollution area comprises the following steps:
performing geophysical detection according to the determined geophysical detection method to obtain original geophysical parameter data;
carrying out data processing and inversion interpretation on the original geophysical prospecting parameter data;
and determining a suspected pollution area according to the inversion result.
3. The method for acquiring the underground pollution condition of the plain terrain refuse landfill site as claimed in claim 2, wherein the processed raw data is inverted to obtain a geophysical parameter profile, and the position of the pollution leakage and the diffusion range of the pollution plume are determined according to the numerical values and trends of the areas with abnormal resistivity and polarization rate on the geophysical parameter profile, so as to identify the suspected pollution area.
4. The method for acquiring the underground pollution condition of the plain terrain refuse landfill site as claimed in claim 1, wherein the geophysical exploration method adopts a combination of a high-density resistivity method and an induced polarization method.
5. The method for acquiring a water pollution condition of a flat terrain landfill site as claimed in claim 1, wherein a plurality of drilling points are arranged in an area where there is a possibility of leakage around the landfill site, and pollutant concentration information is acquired after drilling.
6. The method for acquiring the underground pollution condition of the plain terrain refuse landfill site as set forth in claim 5, wherein the drill holes at the same drilling point acquire the pollutant concentration information at different depths.
7. The method for acquiring the groundwater pollution condition of the flat terrain landfill site as claimed in claim 1, wherein in the geophysical exploration, survey lines are arranged around the landfill site in a direction perpendicular to the flow direction of the groundwater and in a direction parallel to the flow direction of the groundwater.
8. The method for acquiring a contaminated condition of groundwater in a landfill site of flat terrain as claimed in claim 7, wherein the flow of groundwater is obtained by drilling through a drilling site of an area where there is a possibility of leakage.
9. The method according to claim 1, wherein the suspected contaminated area is determined as a result of comparing a geophysical prospecting physical prospecting parameters with a geophysical prospecting parameter threshold.
10. The method for acquiring the underground pollution condition of the plain terrain refuse landfill site as claimed in claim 1, wherein a distribution point position is determined according to a geophysical inversion profile detected in the determined pollution area range, drilling is performed at the distribution point position to acquire the pollutant concentration, and the pollution area identification result is verified.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116773606B (en) * | 2023-07-27 | 2024-03-08 | 北京建工环境修复股份有限公司 | Method for acquiring pollution condition of underwater sediments in river and lake |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116773606B (en) * | 2023-07-27 | 2024-03-08 | 北京建工环境修复股份有限公司 | Method for acquiring pollution condition of underwater sediments in river and lake |
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