CN114324797B - Mine water quality safety evaluation method for underground coal mine reservoir - Google Patents
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 320
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/152—Water filtration
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Abstract
The invention discloses a water quality safety evaluation method for mine water of an underground coal mine reservoir, which comprises the following steps: determining pollution sources in a set area around the underground coal mine reservoir, wherein the pollution sources comprise natural sources and artificial sources which are all possible to influence the water quality of the underground coal mine reservoir underground; determining pollution factors contained in each pollution source according to the pollution sources; collecting mine water samples of the underground reservoir to be evaluated, and selecting different pollution factors as characteristic pollution factors according to the mine water application of the underground reservoir to be evaluated to perform water quality safety evaluation on the mine water samples. According to the scheme, different pollution factors are selected as characteristic pollution factors for evaluating the water quality safety according to the actual application of the mine water of the underground reservoir to be evaluated, so that the underground mine water with different applications has different evaluation factors, the pertinence is high, the reliability is high, and the real and accurate evaluation result of the water quality safety of the underground reservoir of the coal mine can be obtained.
Description
Technical Field
The invention relates to the technical field of water quality safety evaluation, in particular to a water quality safety evaluation method for mine water of an underground coal mine reservoir.
Background
Along with the implementation of a coal exploitation and western shift strategy in China, the mining area of the Ulmus pumila and Shenfu of Shanxi province is gradually developed into an oversized coal field development base in China, but the desert and loess plateau bordering zone at the mining area belongs to a typical semiarid and half-desert plateau Liu Xing climate, and water resources are extremely deficient. Therefore, aiming at the common conditions of large-scale and high-strength mining of mining area coal to generate large-area goafs and a large amount of mine water, the technical scheme for storing the mine water in the underground reservoir of the mine water coal mine is provided, namely, the mine water is stored by utilizing the gaps of the caving rock mass of the goafs, so that the recycling of the mine water is realized. Because the requirements for building the underground reservoir of the coal mine are more strict than those for building the underground reservoir, the engineering safety and the production safety are guaranteed, and the environmental safety is guaranteed, the water quality safety of the underground reservoir of the coal mine is required to be comprehensively evaluated.
The existing water quality safety evaluation scheme mainly aims at the surface or underground drinking water source area, and no special water quality safety evaluation method aims at the underground coal mine reservoir. If the existing index system and evaluation method are adopted to evaluate the mine water quality of the underground coal mine reservoir, the pollution degree of the mine water quality of the underground coal mine reservoir cannot be truly reflected, and the method has larger limitation.
Therefore, it is necessary to develop a water quality safety evaluation method for mine water of an underground coal mine reservoir to solve the above problems.
Disclosure of Invention
The invention aims to solve the technical problem that the pollution degree of the mine water quality of the underground water reservoir cannot be truly reflected by evaluating the water quality safety of the underground water reservoir in a coal mine in the conventional method for evaluating the safety quality of the surface or underground drinking water source, and further provides a water quality safety evaluation method of the mine water of the underground water reservoir in the coal mine.
Aiming at the technical problems, the embodiment of the invention provides the following technical scheme:
the embodiment of the invention provides a water quality safety evaluation method for mine water of an underground coal mine reservoir, which comprises the following steps:
determining pollution sources in a set area around the underground coal mine reservoir, wherein the pollution sources comprise natural sources and artificial sources which are all possible to influence the water quality of the underground coal mine reservoir underground;
determining pollution factors contained in each pollution source according to the pollution sources;
collecting mine water samples of the underground reservoir to be evaluated, and selecting different pollution factors as characteristic pollution factors according to the mine water application of the underground reservoir to be evaluated to perform water quality safety evaluation on the mine water samples.
In some embodiments of the present invention, in the method for safely evaluating the water quality of mine water in an underground coal mine reservoir, the step of collecting a mine water sample of the underground coal mine reservoir to be evaluated, and selecting different pollution factors as characteristic pollution factors according to the mine water application of the underground coal mine reservoir to be evaluated to perform water quality safety evaluation on the mine water sample comprises the following steps:
and carrying out water quality safety evaluation on the mine water sample according to the characteristic pollution factors from the aspects of water quality, acute toxicity risk of water quality and biological sensitivity of water quality.
In some embodiments of the present invention, in the method for safely evaluating the water quality of mine water in an underground coal mine reservoir, the step of collecting a mine water sample of the underground coal mine reservoir to be evaluated, and selecting different pollution factors as characteristic pollution factors according to the mine water application of the underground coal mine reservoir to be evaluated to perform water quality safety evaluation on the mine water sample comprises the following steps:
the mine water application comprises production application, ecological application and living application, and the mine water evaluation standards of different applications are determined according to the underground water quality standard (GB/T14848-2017).
In some embodiments of the present invention, the method for evaluating the safety of the water quality of the mine water of the underground coal mine reservoir, the step of determining the pollution sources in the set area around the underground coal mine reservoir, wherein the pollution sources include all natural sources and artificial sources which may affect the water quality of the underground coal mine reservoir underground in the well, and the steps include:
and determining the underground production life and natural pollution sources and the underground production life and natural pollution sources which affect the water quality of the underground coal mine reservoir according to the historical information record and the field information acquisition result of the underground coal mine reservoir.
In some embodiments of the present invention, the method for evaluating the water quality safety of mine water in an underground coal mine reservoir, wherein the step of determining the pollution factors included in each pollution source according to the pollution sources includes:
determining a plurality of pollution source sampling points in a set area around the underground coal mine reservoir;
collecting a pollution source sample of each pollution source sampling point, and analyzing pollution elements according to the pollution source sample, the conventional index, the characteristic pollutant index and the water quality biological indication species index; collecting a plurality of sampling water samples of the coal mine underground reservoir, and obtaining detection data of each sampling water sample;
acquiring the correlation degree of the pollution element and the detection data of the sampled water sample;
and selecting the pollution elements with the correlation degree larger than a set threshold value as pollution factors.
In some embodiments of the present invention, the method for evaluating the water quality safety of mine water in an underground coal mine reservoir, wherein the step of obtaining the correlation degree between the pollution element and the detection data of the sampled water sample includes:
analyzing the content of the pollution elements of all the pollution source sampling points in the set area and the detection data of the sampling water sample by adopting a singular value decomposition method to obtain the correlation coefficient of the content of the pollution elements in the set area and the detection data of the sampling water sample;
obtaining a pollution element content data matrix according to the pollution element content detected by each pollution source sampling point, and obtaining a detection data matrix of the sampling water sample according to the detection data of the sampling water sample; wherein:
the pollution element content data matrix is as follows:
the detection data matrix of the sampled water sample is as follows:
wherein p represents the number of sampling points of a pollution source, N represents the number of samples of a sampled water sample, t represents the sampling time, and x jn (t) represents the content of the pollution element in the nth sampling water sample corresponding to the jth pollution source sampling point at the sampling time t, y jn (t) representing the detection data of the nth sampled water sample corresponding to the jth pollution source sampling point at the sampling time t;
analyzing to obtain a covariance matrix linking the pollution element content data matrix and the detection data matrix of the sampled water sample;
decomposing the covariance matrix by adopting a singular value decomposition method to obtain a singular value vector of the covariance matrix, wherein each singular value in the singular value vector represents a correlation coefficient of pollution element content data and detection data of a corresponding sampling water sample;
and obtaining the correlation degree of the pollution element content data and the detection data of the corresponding sampling water sample according to the correlation coefficient of the pollution element content data and the detection data of the corresponding sampling water sample in each set area.
In some embodiments of the present invention, in the step of determining the pollution factors included in each pollution source according to the pollution sources, a pollution sharing rate method is used to analyze and obtain the pollution factors, and the pollution sharing rate method includes:
A i ＝C i /S i ；
P i ＝(A i /A m )×100％；
wherein A is i A pollution index indicating the ith pollution element, C i Represents the measured content of the ith pollution element, S i Standard limit value representing ith pollution element, A m Representing a comprehensive pollution index; p (P) i Represents the pollution sharing rate of the ith pollution element, expressed as P i The pollution element whose value exceeds the set threshold value is used as the pollution factor.
In some embodiments of the present invention, in the method for safely evaluating the water quality of mine water in an underground coal mine reservoir, the step of collecting a mine water sample of the underground coal mine reservoir to be evaluated, and selecting different pollution factors as characteristic pollution factors according to the mine water use of the underground coal mine reservoir to be evaluated to perform water quality safety evaluation on the mine water sample is performed:
determining characteristic pollution factors according to the requirements of the actual water supply application of the underground reservoir to be evaluated on water quality, wherein the characteristic pollution factors are P i The sum of the values is above the set point.
In some embodiments of the present invention, in the method for safely evaluating the water quality of mine water in an underground water reservoir of a coal mine, a mine water sample of the underground water reservoir to be evaluated is collected, and different pollution factors are selected as characteristic pollution factors according to the use of the mine water in the underground water reservoir to be evaluated, so as to perform the water quality safety evaluation on the mine water sample, wherein the method comprises the following steps:
and carrying out principal component analysis of the mine water sample according to the pollution factor obtained by the pollution sharing rate method and the water quality detection data of the mine water sample obtained by actual detection by combining a principal component analysis method, and determining the characteristic pollution factor in the mine water sample according to a principal component analysis result.
In some embodiments of the invention, the method for evaluating the water quality safety of mine water of the underground coal mine reservoir comprises the following steps: the method comprises the steps of determining pollution sources in a set area around the underground coal mine reservoir, wherein the pollution sources comprise natural sources and artificial sources which possibly affect the water quality of the underground coal mine reservoir underground in the well: selecting a plurality of coal mine underground reservoirs, and determining a pollution source of each coal mine underground reservoir; in the step of determining the pollution factor contained in each pollution source according to the pollution sources: and determining pollution factors contained in the pollution sources according to the influence of the pollution sources in each coal mine underground reservoir on the water quality safety.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
according to the water quality safety evaluation method for the mine water of the underground coal mine reservoir, provided by the invention, the pollution sources around the underground coal mine reservoir are analyzed, so that the pollution factors contained in the pollution sources are determined, wherein the pollution sources cover all natural sources and artificial sources which possibly affect the water quality of the underground coal mine reservoir underground. When the mine water sample of the underground reservoir to be evaluated is required to be evaluated, different pollution factors are respectively selected as characteristic pollution factors for evaluating the water quality safety according to the actual use of the mine water of the underground reservoir to be evaluated, so that the underground mine water with different uses is different in evaluation factors, the pertinence is high, the reliability is high, and the real and accurate evaluation result of the water quality safety of the underground reservoir of the coal mine can be obtained.
Drawings
The objects and advantages of the present invention will be better understood by describing in detail preferred embodiments thereof with reference to the accompanying drawings in which:
fig. 1 is a schematic diagram of steps of a method for evaluating the safety of mine water quality of an underground coal mine reservoir according to an embodiment of the invention.
FIG. 2 is a schematic diagram showing the correspondence between the usage of mine water and the evaluation index according to an embodiment of the present invention;
fig. 3 is a flowchart of a pollution factor determining method according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The embodiment provides a water quality safety evaluation method for mine water of an underground coal mine reservoir, which comprises the following steps as shown in fig. 1:
step one: and determining pollution sources in a set area around the underground coal mine reservoir, wherein the pollution sources comprise natural sources and artificial sources which are all possible to influence the water quality of the underground coal mine reservoir underground. In the step, the historical data is used as a basis to determine which pollution sources can influence the mine water quality of the underground reservoir around the coal mine underground reservoir, and the underground reservoir to be evaluated is guided to select the pollution sources according to the historical data and the results obtained by on-site investigation sampling analysis. Among them, natural sources existing on the well, which may have an influence on water quality, may include some of the pollution elements contained in the soil itself, and artificial sources may include pollution elements existing in wastewater or household garbage generated in the living process. Similarly, natural sources that may affect water quality in the well may include some of the contaminating elements contained in the rock and soil, in the coal mine, and artificial sources may include contaminating elements present in the waste or garbage produced by workers during their life downhole. The set area can be selected according to the area where the underground reservoir of the coal mine is located, the underground reservoir is required to be fully contained, and meanwhile, pollution influences such as living areas or pasture areas are truly caused.
Step two: and determining the pollution factors contained in each pollution source according to the pollution sources. The pollution elements, chemical components and biological components contained in each pollution source are various, and the chemical components and biological components which possibly affect the water quality safety contained in each pollution source can be determined by test means and the like to serve as pollution factors.
Step three: collecting mine water samples of the underground reservoir to be evaluated, and selecting different pollution factors as characteristic pollution factors according to the mine water application of the underground reservoir to be evaluated to perform water quality safety evaluation on the mine water samples. The underground reservoir to be evaluated can be an underground reservoir belonging to the same area as the coal mine underground reservoir in the first step (for example, the underground reservoir belongs to the mine area of the elm god of the north of shan), or can be evaluated by selecting the underground reservoirs in different areas, and the method obtained through the steps is an evaluation method with general application significance, so that the method can be applied to water quality safety evaluation of general underground reservoirs. The key in the scheme is that mine water of the underground reservoir to be evaluated can be used for different purposes, and the content requirements of the mine water for different purposes on chemical components and biological components are different.
As shown in fig. 2, the mine water uses include production use, ecological use and life use, and mine water evaluation standards for different uses are determined according to the underground water quality standards. If the mine water is mine water for production, the content of chemical components and biological components of the mine water of the underground reservoir is required to be medium, and if the mine water is mine water for ecological use, the content of the chemical components and the biological components of the mine water of the underground reservoir is required to be high, and the mine water is based on the quality of agriculture and liquid supply water and a certain level of human health risk; in the case of mine water for domestic use, the mine water in the underground reservoir is required to have a medium content of chemical components and biological components. As a preferred embodiment, the mine water evaluation standard for different purposes is determined according to the underground water quality standard (GB/T14848-2017) in the scheme. The evaluation index and the limit value of the groundwater quality are given, and the groundwater quality is classified into class I, class II, class III, class IV and class V according to the quality requirements of drinking water, industry, agriculture and the like according to the water quality conditions and the human health risks, and according to the content of each component (except the PH value, the content of chemical components and biological components is mainly analyzed), and the detailed contents specified in the standards can be referred to specifically. According to the scheme provided by the embodiment of the invention, aiming at the underground coal mine reservoir, different pollution factors are respectively selected to evaluate the water quality safety according to the actual use of the mine water of the reservoir to be evaluated, the pertinence is high, the reliability is high, and the real and accurate evaluation result of the water quality safety of the underground coal mine reservoir can be obtained.
Specifically, in the scheme, indexes of water quality, acute toxicity risk of water quality and biological sensitivity of water quality are selected to carry out safety evaluation on mine water with different purposes. After the coal mining is finished, after the abandoned mine is stopped, the underground pressure and ventilation conditions are changed, and the microbial environment structure and functions of the mine are also changed, so that the migration and transformation of pollutants are affected. Organic pollutants contained in engine oil and emulsifying agents left by coal exploitation devices have three causes, bioaccumulation and difficult degradation, and the organic pollutants can be left in mine water of an underground reservoir. Various household garbage can be produced in the life of the well, and the household garbage can possibly permeate into mine water along with rainfall through surface soil. These may have an effect on the quality of the mine water. The water quality detection, the water quality acute toxicity detection and the water quality biological sensitivity detection all have mature detection instruments at present, in the step, the detection of the mine water sample to be evaluated can be directly carried out by adopting the instruments, and the detection result is input into a computer system applied by the method.
In the above scheme, in the specific implementation, the step one is to determine the above-mentioned well life pollution source and the below-mentioned well production life pollution source which affect the water quality of the underground coal mine reservoir according to the history information record and the on-site information acquisition result of the underground coal mine reservoir. The historical information record can be obtained through network retrieval, yearbook inquiry and other modes, and the on-site information collection can directly sample soil in the surrounding area of the underground reservoir of the coal mine, underground reservoir mine water and the like as samples for detection so as to determine pollutants and the sources of the pollutants.
Preferably, as shown in fig. 3, the pollution sources in the set area around the underground coal mine reservoir are determined by the following steps:
s201, determining a plurality of pollution source sampling points in a set area around the underground coal mine reservoir. As previously described, the contamination source sampling points include both uphole sampling points and downhole sampling points. The pollution source sampling points can be randomly selected, and different pollution sampling points should be spaced a certain distance.
S202: collecting a pollution source sample of each pollution source sampling point, and analyzing pollution elements according to the pollution source sample, the conventional index, the characteristic pollutant index and the water quality biological indication species index; and collecting a plurality of sampling water samples of the underground coal mine reservoir, and obtaining detection data of each sampling water sample. Specifically, the relation between the pollution source sampling points and the coal mine underground reservoirs can be many-to-one or many-to-many, namely, a plurality of coal mine underground reservoirs can be selected, the pollution source of each coal mine underground reservoir is determined by selecting the plurality of pollution source sampling points according to each coal mine underground reservoir, and it can be understood that the more the reference samples are, the more accurate the final water quality safety detection result is. In this step, the conventional index may include PH, chloride, etc., the characteristic contaminant index may be selected, for example, benzene substances which are difficult to decompose in the emulsion, etc., and the water quality biological indicator species may be determined according to the contamination of the biological community on the well, etc.
S203: and acquiring the correlation degree of the pollution element and the detection data of the sampled water sample. Specifically, it may include:
s301: and analyzing the content of the pollution elements of all the pollution source sampling points in the set area and the detection data of the sampling water sample by adopting a singular value decomposition method to obtain the correlation coefficient of the content of the pollution elements in the set area and the detection data of the sampling water sample.
S302: obtaining a pollution element content data matrix according to the pollution element content detected by each pollution source sampling point, and obtaining a detection data matrix of the sampling water sample according to the detection data of the sampling water sample; wherein:
the pollution element content data matrix is as follows:
the detection data matrix of the sampled water sample is as follows:
wherein p represents the number of sampling points of a pollution source, N represents the number of samples of a sampled water sample, t represents the sampling time, and x jn (t) represents the content of the pollution element in the nth sampling water sample corresponding to the jth pollution source sampling point at the sampling time t, y jn (t) represents the detection data of the nth sampled water sample corresponding to the jth pollution source sampling point at the sampling time t.
S303: and analyzing to obtain a covariance matrix linking the pollution element content data matrix and the detection data matrix of the sampled water sample. Specifically, a pollution element content data matrix is taken as a left meteorological field, a detection data matrix of a sampled water sample is taken as a right meteorological field, a cross covariance matrix between left and right meteorological fields is obtained, the relation between the left and right meteorological fields is spatially matched, and the covariance matrix between the left and right meteorological fields is set as follows:wherein, E.]Representing mathematical expectations, a covariance matrix is used to scale the correlation between the contaminant elements and the sensed data of the sampled water sample.
S304: and decomposing the covariance matrix by adopting a singular value decomposition method to obtain singular value vectors of the covariance matrix, wherein each singular value in the singular value vectors represents a correlation coefficient of pollution element content data and detection data of a corresponding sampling water sample. Singular value decomposition is carried out on the covariance matrix, and the following steps are obtained:
in the above formula, m=min (p 1 ,p 2 )，L k Are left singular vectors of the covariance matrix, which are all orthogonal spatial functions (L 'l=i, R' r=i, I is the identity matrix). Lambda (lambda) k Is singular value vector of covariance matrix and is provided with lambda 1 ≥λ 2 ≥λ 3 ≥...≥λ M 0 or more, each of which has a singular value lambda 1 、λ 2 ……λ M To represent the correlation coefficient between a contaminant element and the sensed data of the sampled water sample.
S305: and obtaining the correlation degree of the pollution element content data and the detection data of the corresponding sampling water sample according to the correlation coefficient of the pollution element content data and the detection data of the corresponding sampling water sample in each set area. By the scheme of the embodiment, a simple method is provided for quantitatively measuring the association between the pollution elements of the sampling points and the detection data of the sampled water samples. Due to the characteristics of the singular value decomposition method, the data amount requirement can be properly reduced, and meanwhile, the operation steps are simplified.
S204: and selecting the pollution elements with the correlation degree larger than a set threshold value as pollution factors. For example, the correlation coefficient lambda between the contamination element k and the detected data k By a correlation coefficient between the contamination element and the detection data of more than forty percent, the contamination element k should be regarded as a contamination factor.
Preferably, in the above scheme, the pollution factor may be determined by using a pollution sharing rate method, where the pollution sharing rate method includes:
A i ＝C i /S i ；
P i ＝(A i /A m )×100％；
wherein A is i A pollution index indicating the ith pollution element, C i The measured content of the ith pollution element can be measured concentration value (the pollution factor can comprise compounds from domestic garbage, organic matters from remained emulsion, microorganisms from animal excreta in animal farm, etc.), S i The standard limit value of the ith pollution element is indicated (namely, the concentration value of each pollution element in mine water has an upper limit value for different purposes), and theoretically, the smaller the measured concentration value of all the pollution elements is, the better the water quality is. A is that m Indicating the comprehensive pollution index, it is obvious that A m The smaller the value of (2) is, the better the water quality of the mine water to be evaluated is; p (P) i Represents the pollution sharing rate of the ith pollution element, expressed as P i The pollution factor is a pollution factor whose value exceeds a set threshold, which can be determined based on calibration tests or historical empirical values. Clearly, a higher pollution sharing rate indicates that the pollution element has a greater impact on water quality, and should be selected as a pollution factor.
Further, in the fourth step, collecting the mine water sample of the underground reservoir to be evaluated, and selecting different pollution factors as characteristic pollution factors according to the mine water use of the underground reservoir to be evaluated, so as to perform water quality safety evaluation on the mine water sample specifically includes: determining characteristic pollution factors according to the requirements of the actual water supply application of the underground reservoir to be evaluated on water quality, wherein the characteristic pollution factors are P i The sum of the values is above the set point. That is, according to the water quality requirement of the water supply application of the underground reservoir to be evaluated, a representative pollution factor is determined as a characteristic pollution factor, wherein the representative pollution factor isP of pollution factor(s) i The sum of the values being above the set point, e.g. P, which is representative of the pollution factor i And taking the pollution factor with the sum of the values being more than 85% as the characteristic pollution factor, and then evaluating the water quality safety of the mine water to be evaluated by utilizing the characteristic pollution factor.
Further, in the above solution, the step four may further include: and carrying out principal component analysis of the mine water sample according to the pollution factor obtained by the pollution sharing rate method and the water quality detection data of the mine water sample obtained by actual detection by combining a principal component analysis method, and determining the characteristic pollution factor in the mine water sample according to a principal component analysis result. In the step, the pollution factor obtained according to the pollution sharing rate method and the water quality detection data of the mine water sample obtained through actual detection can be input into an application program capable of executing statistical operation, and the principal component analysis result can be directly obtained through calling the application program of the principal component analysis method, so that the characteristic pollution factor contained in the mine water sample is obtained.
The method is further described by taking the coal mine underground reservoir in the Shendong mining area as an example, and the water quality safety evaluation method for the coal mine underground reservoir in the Shendong mining area comprises the following steps:
step one: determining pollution sources in a set area around the underground coal mine reservoir, wherein the pollution sources comprise natural sources and artificial sources which possibly affect the water quality of the underground coal mine reservoir in the underground well: the method collects and develops field investigation on current state data of mine water quality of underground reservoirs (23 in-use underground reservoirs such as Harrow ditches, large Liu Da, jin-shaped kingdom and Boolean platforms) in coal mines in the Shendong mining areas through turning over statistical annual notices of the Shendong mining areas, chinese knowledge network databases and the like, and analyzes and evaluates influences of production life on the mine water quality of the underground reservoirs in the underground production life and underground production life. The on-site investigation comprises on-site sampling analysis of coal mine underground reservoirs, namely sampling and water quality analysis of mine water entering and exiting from 23 coal mine underground reservoirs in Shendong mining areas.
Step two: determining pollution factors contained in each pollution source according to the pollution sources: the method is characterized in that the environmental and pollution source investigation and the conventional index, the characteristic pollutant index and the water quality biological indication species monitoring result analysis of the underground coal mine reservoir are utilized, the singular value decomposition method, the pollution sharing rate method, the multivariate statistical method and the like are utilized to analyze the source of pollution elements, the pollution factors in the pollution sources are defined, and the main pollution or potential pollution causes and key monitoring indexes are determined. The pollution factor evaluation of mine water in the underground water reservoir of the coal mine in the Shendong mining area adopts III, IV and III water quality standards in the national underground water quality standard (GB/T14848-2017) according to different purposes such as production, ecology and life. The multi-element statistical method can adopt a singular value decomposition method and a principal component analysis method, and in the step, main pollution factors calculated based on a pollution sharing rate method can be analyzed by utilizing SPSS18.0 software based on water quality detection data of mine water obtained by field investigation.
Step three: safety evaluation of mine water quality of underground coal mine reservoirs: according to different uses of mine water for production, life, ecology and the like, a comprehensive evaluation system for mine water quality safety of the underground coal mine reservoir is constructed from two layers of physical and chemical index evaluation and biological index evaluation by a water quality index evaluation method, a water quality acute toxicity risk evaluation method and a water quality biological sensitivity evaluation method. And selecting characteristic pollution factors with the sum of pollution sharing rates of more than 85-90% as water quality indexes for comprehensive water quality evaluation according to different water quality purposes and corresponding water quality requirements.
The technical scheme provided by the embodiment of the invention can evaluate the water quality safety of the mine water of the underground coal mine reservoir, has pertinence compared with the conventional surface or underground water source evaluation method, and can truly and accurately reflect the safety detection results of the underground coal mine reservoir under different application requirements.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While obvious variations or modifications are contemplated as falling within the scope of the present invention.
Claims (8)
1. The water quality safety evaluation method for the mine water of the underground coal mine reservoir is characterized by comprising the following steps of:
determining pollution sources in a set area around the underground coal mine reservoir, wherein the pollution sources comprise natural sources and artificial sources which are all possible to influence the water quality of the underground coal mine reservoir underground;
determining pollution factors contained in each pollution source according to the pollution sources;
collecting mine water samples of the underground reservoir to be evaluated, and selecting different pollution factors as characteristic pollution factors according to the mine water application of the underground reservoir to be evaluated to perform water quality safety evaluation on the mine water samples;
the step of determining the pollution factors contained in each pollution source according to the pollution sources comprises the following steps:
determining a plurality of pollution source sampling points in a set area around the underground coal mine reservoir;
collecting a pollution source sample of each pollution source sampling point, and analyzing pollution elements according to the pollution source sample, the conventional index, the characteristic pollutant index and the water quality biological indication species index; collecting a plurality of sampling water samples of the coal mine underground reservoir, and obtaining detection data of each sampling water sample;
acquiring the correlation degree of the pollution element and the detection data of the sampled water sample;
selecting a pollution element with the correlation degree larger than a set threshold value as a pollution factor;
the step of obtaining the correlation degree of the pollution element and the detection data of the sampled water sample comprises the following steps:
analyzing the content of the pollution elements of all the pollution source sampling points in the set area and the detection data of the sampling water sample by adopting a singular value decomposition method to obtain the correlation coefficient of the content of the pollution elements in the set area and the detection data of the sampling water sample;
obtaining a pollution element content data matrix according to the pollution element content detected by each pollution source sampling point, and obtaining a detection data matrix of the sampling water sample according to the detection data of the sampling water sample; wherein:
the pollution element content data matrix is as follows:
the detection data matrix of the sampled water sample is as follows:
wherein p represents the number of sampling points of a pollution source, N represents the number of samples of a sampled water sample, t represents the sampling time, and x jn (t) represents the content of the pollution element in the nth sampling water sample corresponding to the jth pollution source sampling point at the sampling time t, y jn (t) representing the detection data of the nth sampled water sample corresponding to the jth pollution source sampling point at the sampling time t;
analyzing to obtain a covariance matrix linking the pollution element content data matrix and the detection data matrix of the sampled water sample;
decomposing the covariance matrix by adopting a singular value decomposition method to obtain a singular value vector of the covariance matrix, wherein each singular value in the singular value vector represents a correlation coefficient of pollution element content data and detection data of a corresponding sampling water sample;
and obtaining the correlation degree of the pollution element content data and the detection data of the corresponding sampling water sample according to the correlation coefficient of the pollution element content data and the detection data of the corresponding sampling water sample in each set area.
2. The method for evaluating the water quality safety of mine water of an underground water reservoir of a coal mine according to claim 1, wherein the step of collecting a mine water sample of the underground water reservoir to be evaluated, and selecting different pollution factors as characteristic pollution factors according to the mine water use of the underground water reservoir to be evaluated, and performing the water quality safety evaluation on the mine water sample is characterized in that:
and carrying out water quality safety evaluation on the mine water sample according to the characteristic pollution factors from the aspects of water quality, acute toxicity risk of water quality and biological sensitivity of water quality.
3. The method for evaluating the water quality safety of mine water of an underground water reservoir of a coal mine according to claim 2, wherein the step of collecting the mine water sample of the underground water reservoir to be evaluated, and selecting different pollution factors as characteristic pollution factors according to the mine water application of the underground water reservoir to be evaluated, and performing the water quality safety evaluation on the mine water sample is characterized in that:
the mine water application comprises production application, ecological application and living application, and the mine water evaluation standards of different applications are determined according to the underground water quality standard (GB/T14848-2017).
4. The method for evaluating the safety of mine water quality of an underground coal mine reservoir according to claim 1, wherein the step of determining pollution sources in a set area around the underground coal mine reservoir, wherein the pollution sources comprise all natural sources and artificial sources which can affect the water quality of the underground coal mine reservoir underground in a well, and the step of determining the pollution sources comprises the following steps:
and determining the underground production life and natural pollution sources and the underground production life and natural pollution sources which affect the water quality of the underground coal mine reservoir according to the historical information record and the field information acquisition result of the underground coal mine reservoir.
5. The method for evaluating the safety of mine water quality of an underground coal mine reservoir according to claim 1, wherein in the step of determining the pollution factors contained in each pollution source according to the pollution sources, a pollution sharing rate method is used for analyzing to obtain the pollution factors, and the pollution sharing rate method comprises:
A i ＝C i /S i ；
P i ＝(A i /A m )×100％；
wherein A is i A pollution index indicating the ith pollution element, C i Represents the measured content of the ith pollution element, S i Standard limit value representing ith pollution element, A m Representing a comprehensive pollution index; p (P) i Represents the pollution sharing rate of the ith pollution element, expressed as P i The pollution element whose value exceeds the set threshold value is used as the pollution factor.
6. The method for evaluating the water quality safety of mine water of an underground water reservoir of a coal mine according to claim 5, wherein in the step of collecting the mine water sample of the underground water reservoir to be evaluated, different pollution factors are selected as characteristic pollution factors according to the mine water use of the underground water reservoir to be evaluated, and the water quality safety of the mine water sample is evaluated:
determining characteristic pollution factors according to the requirements of the actual water supply application of the underground reservoir to be evaluated on water quality, wherein the characteristic pollution factors are P i The sum of the values is above the set point.
7. The method for evaluating the safety of water quality of mine water of an underground water reservoir of a coal mine according to claim 6, wherein the step of collecting a mine water sample of the underground water reservoir to be evaluated and selecting different pollution factors as characteristic pollution factors according to the mine water use of the underground water reservoir to be evaluated to evaluate the safety of water quality of the mine water sample comprises the steps of:
and carrying out principal component analysis of the mine water sample according to the pollution factor obtained by the pollution sharing rate method and the water quality detection data of the mine water sample obtained by actual detection by combining a principal component analysis method, and determining the characteristic pollution factor in the mine water sample according to a principal component analysis result.
8. The method for evaluating the water quality safety of mine water of an underground coal mine reservoir according to any one of claims 1 to 7, wherein:
the method comprises the steps of determining pollution sources in a set area around the underground coal mine reservoir, wherein the pollution sources comprise natural sources and artificial sources which possibly affect the water quality of the underground coal mine reservoir underground in the well: selecting a plurality of coal mine underground reservoirs, and determining a pollution source of each coal mine underground reservoir;
in the step of determining the pollution factor contained in each pollution source according to the pollution sources: and determining pollution factors contained in the pollution sources according to the influence of the pollution sources in each coal mine underground reservoir on the water quality safety.
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