CN109711736B - Method and device for screening watershed water environment risk substances - Google Patents
Method and device for screening watershed water environment risk substances Download PDFInfo
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Abstract
The embodiment of the invention discloses a method and a device for screening watershed water environment risk substances. The method comprises the following steps: obtaining the exposure concentration of each pollutant in the water environment of the target watershed, and comparing the exposure concentration with an environmental safety threshold; acquiring the exposure concentration of a target pollutant greater than an environmental safety threshold, constructing a cumulative probability distribution curve based on the exposure concentration of the target pollutant, and calculating the probability that the exposure concentration of the target pollutant exceeds the environmental safety threshold based on the cumulative probability distribution curve; if the probability is greater than the probability threshold, quantifying the environmental risk of the target pollutant according to preset software based on the aquatic organism toxicity data of the target pollutant and the exposure concentration of the target pollutant, and obtaining the expected environmental risk of the target pollutant based on the quantified environmental risk; and if the expected environmental risk is greater than a preset first expected environmental risk threshold value, the target pollutant is confirmed to be a potential environmental risk substance. By applying the method and the device, the screening efficiency of the environmental risk pollutants can be improved.
Description
Technical Field
The invention relates to an environmental risk assessment technology, in particular to a method and a device for screening watershed water environment risk substances.
Background
With the rapid development of modern industry, discharged industrial waste causes irreversible pollution to the environment. Therefore, how to evaluate the harm of toxic and harmful pollutants in the environment, develop the risk evaluation of the toxic and harmful pollutants, determine the environmental risk substances becomes an important research field of pollutant environmental risk management. Due to the variety of pollutants in the watershed environment, the corresponding water quality standard cannot be established for each pollutant, effective control and treatment measures are implemented, and only some key pollutants, namely environment risk substances, can be screened out from various pollutants in a targeted manner to be preferentially controlled.
In recent years, researchers at home and abroad have started studying toxicity and environmental effects of pollutants, and ranking and score calculation are performed according to the detection frequency, toxicity, accumulation and the like of each pollutant. However, such methods require collecting a large amount of data for grading and scoring, including toxicity data, exposure data, emission amount, degradability data, etc. of the pollutants, and perform risk assessment according to detailed detection data of the pollutants for each pollutant, which is difficult to operate and cannot be quickly applied to environmental risk management.
Disclosure of Invention
In view of this, the embodiment of the invention provides a method and a device for screening watershed water environment risk substances, so as to improve the pollutant environment risk management efficiency.
The embodiment of the invention provides a method for screening watershed water environment risk substances, which comprises the following steps:
obtaining the exposure concentration of each pollutant in the water environment of the target watershed, and comparing the exposure concentration with a preset environmental safety threshold;
acquiring the exposure concentration of a target pollutant which is greater than the environmental safety threshold, constructing a cumulative probability distribution curve of the target pollutant based on the exposure concentration of the target pollutant, and calculating the probability that the exposure concentration of the target pollutant exceeds the environmental safety threshold based on the cumulative probability distribution curve;
if the probability is larger than a preset probability threshold value, quantifying the environmental risk of the target pollutant according to preset software based on the aquatic organism toxicity data of the target pollutant and the exposure concentration of the target pollutant, and obtaining the expected environmental risk of the target pollutant based on the quantified environmental risk;
and if the expected environmental risk is greater than a preset first expected environmental risk threshold value, confirming that the target pollutant is a potential environmental risk substance.
Optionally, after identifying the target pollutant as a potentially environmentally hazardous substance, the method further comprises:
risk ranking the target pollutant based on the expected environmental risk.
Optionally, said risk ranking said target pollutant based on said expected environmental risk comprises:
if the expected environmental risk is larger than a preset first expected environmental risk threshold and is smaller than or equal to a second expected environmental risk threshold, determining that the target pollutant is a low environmental risk substance;
if the expected environmental risk is larger than a preset second expected environmental risk threshold and is smaller than or equal to a third expected environmental risk threshold, determining that the target pollutant is a medium environmental risk substance;
and if the expected environmental risk is greater than a preset third expected environmental risk threshold value, determining that the target pollutant is a high environmental risk substance.
Optionally, the first expected environmental risk threshold is set to 1%, the second expected environmental risk threshold is set to 10%, and the third expected environmental risk threshold is set to 30%.
Optionally, the environmental safety threshold comprises a predicted no-effect concentration.
Optionally, the method further comprises:
and if the exposure concentration of the pollutant is less than the environmental safety threshold value, confirming that the pollutant is a non-environmental risk substance.
Optionally, the method further comprises:
and if the expected environmental risk is not greater than a preset first expected environmental risk threshold value, determining that the target pollutant is a non-environmental risk substance.
The embodiment of the invention provides a device for screening watershed water environment risk substances, which comprises:
the exposure concentration processing module is used for acquiring the exposure concentration of each pollutant in the water environment of the target watershed and comparing the exposure concentration with a preset environment safety threshold;
the probability calculation module is used for acquiring the exposure concentration of the target pollutant which is greater than the environmental safety threshold, constructing a cumulative probability distribution curve of the target pollutant based on the exposure concentration of the target pollutant, and calculating the probability that the exposure concentration of the target pollutant exceeds the environmental safety threshold based on the cumulative probability distribution curve;
an expected environmental risk obtaining module, which quantifies the environmental risk of the target pollutant according to preset software based on aquatic organism toxicity data of the target pollutant and the exposure concentration of the target pollutant obtained in advance if the probability is greater than a preset probability threshold, and obtains the expected environmental risk of the target pollutant based on the quantified environmental risk;
and the risk evaluation module confirms that the target pollutant is a potential environmental risk substance if the expected environmental risk is greater than a preset first expected environmental risk threshold value.
Optionally, the apparatus further comprises:
a risk ranking module to rank the risk of the target pollutant based on the expected environmental risk.
Optionally, the risk ranking module is specifically configured to:
if the expected environmental risk is larger than a preset first expected environmental risk threshold and is smaller than or equal to a second expected environmental risk threshold, determining that the target pollutant is a low environmental risk substance;
if the expected environmental risk is larger than a preset second expected environmental risk threshold and is smaller than or equal to a third expected environmental risk threshold, determining that the target pollutant is a medium environmental risk substance;
and if the expected environmental risk is greater than a preset third expected environmental risk threshold value, determining that the target pollutant is a high environmental risk substance.
The embodiment of the invention provides a method and a device for screening watershed water environment risk substances, which comprises the following steps: obtaining the exposure concentration of each pollutant in the water environment of the target watershed, and comparing the exposure concentration with a preset environmental safety threshold; acquiring the exposure concentration of a target pollutant which is greater than the environmental safety threshold, constructing a cumulative probability distribution curve of the target pollutant based on the exposure concentration of the target pollutant, and calculating the probability that the target pollutant exceeds the environmental safety threshold based on the cumulative probability distribution curve; if the probability is larger than a preset probability threshold value, quantifying the environmental risk of the target pollutant according to preset software based on the aquatic organism toxicity data of the target pollutant and the exposure concentration of the target pollutant, and obtaining the expected environmental risk of the target pollutant based on the quantified environmental risk; if the expected environmental risk is greater than a preset first expected environmental risk threshold, the target pollutant is determined to be a potential environmental risk substance, and the environmental risk management efficiency of the pollutant can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for screening watershed water environment risk substances according to an embodiment of the invention;
FIG. 2 is another schematic flow chart of the method for screening watershed water environment risk substances according to the embodiment of the invention;
fig. 3 is a schematic structural diagram of a device for screening watershed water environment risk substances according to an embodiment of the invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the application, a screening method of the target watershed water environment risk substances is constructed, and from the perspective of environmental risk evaluation, a step-by-step risk screening and evaluation method is adopted to carry out hierarchical environmental risk evaluation on pollutants in the watershed water environment, so that the economy of a screening process is considered, complex high-level evaluation is not required to be carried out on each pollutant, a large amount of toxicity data is prevented from being collected for each pollutant, and manpower and material resources are saved; the accuracy of screening is also considered, the pollutants with risks can be quantitatively evaluated and sequenced accurately, and scientific basis is provided for watershed water environment management.
Fig. 1 is a schematic flow chart of a method for screening watershed water environment risk substances according to an embodiment of the invention. As shown in fig. 1, the process includes:
in the embodiment of the application, pollutants contained in the water environment of the target watershed are firstly obtained, the exposure concentration of each pollutant is obtained aiming at each pollutant of the water environment of the target watershed, and the exposure concentrations of the pollutants in the water environment of the target watershed are respectively compared with the environmental safety threshold value so as to determine whether the corresponding pollutants need to be further processed.
In the embodiment of the present application, as an optional embodiment, the environmental safety threshold includes, but is not limited to, Predicted No Effect Concentration (PNEC).
In the embodiment of the present application, as an optional embodiment, the exposure concentration of each pollutant may be obtained from publicly published documents by querying network data, or may be actually measured by sampling a water sample from a target watershed water environment, and thereby, the exposure concentration of each pollutant, for example, a metal pollutant of interest, a benzene series, and the like, at each sampling point is actually measured. In the embodiment of the present application, as another optional embodiment, different pollutants and methods for determining the exposure concentration may also be different, and specifically, according to the published relevant standard sampling method and testing method, in the water environment of the target watershed, a water sample is collected according to a preset sampling point principle, and then the exposure concentration of each pollutant contained in the water sample is measured.
102, acquiring the exposure concentration of a target pollutant greater than the environmental safety threshold, constructing a cumulative probability distribution curve of the target pollutant based on the exposure concentration of the target pollutant, and calculating the probability that the target pollutant exceeds the environmental safety threshold based on the cumulative probability distribution curve;
in the embodiment of the present application, the target pollutant whose exposure concentration is greater than the environmental safety threshold may be an environmental risk substance or may not be an environmental risk substance, and therefore, the next-stage screening evaluation is required. The target contaminant is broadly defined herein and may include one or more contaminants. For example, if there are two contaminants with exposure concentrations greater than the environmental safety threshold, the number of target contaminants is 2, and each contaminant greater than the environmental safety threshold corresponds to an exposure concentration profile.
In the embodiment of the present application, as an optional embodiment, each pollutant corresponds to a environmental safety threshold (PNEC), and the environmental safety thresholds corresponding to different pollutants may be the same or different. Reference may be made specifically to and taken from relevant standards or benchmark values for such contaminants.
In this embodiment, as an optional embodiment, a pollutant corresponds to a cumulative probability distribution curve, and the cumulative probability distribution curve of the target pollutant is constructed by using a lognormal distribution function as follows:
in the formula (I), the compound is shown in the specification,
y is the cumulative probability of the target contaminant, i.e., the cumulative probability of the exposure concentration of the target contaminant,%;
x is the exposure concentration of the target pollutant, mu g/L;
u is the average value of the exposure concentration of the target pollutant, and is microgram/L;
σ is the standard deviation of the target contaminant exposure concentration, μ g/L.
In the embodiment of the application, a cumulative probability distribution curve of the exposure concentration of the target pollutant can be fitted by Matlab software by using the lognormal distribution function as described above, and the probability that the pollutant exceeds the environmental safety threshold is calculated based on the cumulative probability distribution curve.
In this embodiment, as another optional embodiment, the method further includes:
and if the exposure concentration of the pollutant is less than the environmental safety threshold value, confirming that the pollutant is a non-environmental risk substance.
In the embodiment of the application, for the pollutant with the exposure concentration less than the environmental safety threshold, the environmental risk is negligible, and the pollutant can be determined to be a non-environmental risk substance without further evaluation. Therefore, through preliminary analysis of the exposure concentration of the pollutants, a large part of pollutants which do not have risks to the environment can be removed, so that all data of each pollutant do not need to be acquired, and the screening efficiency of the pollutants can be effectively improved.
103, if the probability is greater than a preset probability threshold, quantifying the environmental risk of the target pollutant according to preset software based on the aquatic organism toxicity data of the target pollutant and the exposure concentration of the target pollutant, and obtaining the expected environmental risk of the target pollutant based on the quantified environmental risk;
in the embodiment of the application, the probability that the target pollutant exceeding the environmental safety threshold exceeds the environmental safety threshold is calculated, the next-level evaluation is needed for the pollutant of which the probability exceeds the probability threshold, and the environmental risk of the pollutant of which the probability does not exceed the probability threshold is negligible without further evaluation. As an alternative embodiment, the environmental safety threshold may be set to a baseline value (PNEC) or standard value for the contaminant, and the probability threshold may be set to 0.01 (1%).
In the embodiment of the present application, as an optional embodiment, the environmental Risk of the target pollutant is quantified by a combined plot of the cumulative probability of toxicity data of the aquatic organisms of the pollutant and the cumulative probability of exposure concentration of the pollutant, and the area under the curve obtained by quantification represents the Expected Environmental Risk (EER) which is used for indicating the environmental Risk that the target pollutant can be expected under the exposure concentration and the toxicity effect concentration distribution.
In the embodiment of the present application, as an optional embodiment, the environmental risk of the pollutant can be quantified through ETX2.0 software, and by inputting the exposure concentration of the target pollutant and the toxicity data of the aquatic organism into the software, the EER can be directly calculated, and the risk level of the pollutant can be judged through the EER.
In the embodiment of the present application, taking a contaminant a in a target water flow as an example, the exposure concentration of the contaminant a in the target water flow is shown in table 1. Aquatic toxicity data for contaminant a, for example, reproductive toxicity data, are shown in table 2.
TABLE 1 Exposure concentration of a target basin A contaminant
Table 2A chronic toxicity data for aquatic organisms for contaminants
The exposure concentrations of table 1 and the reproductive toxicity data of table 2 were entered into ETX2.0 software, respectively;
running ETX2.0 software, quantifying the environmental risk of the pollutant A, obtaining a curve, calculating the area under the curve, and obtaining the EER based on the calculated area, wherein the EER of the pollutant A in the target water flow field is 30.35% in the embodiment of the application.
And 104, if the expected environmental risk is greater than a preset first expected environmental risk threshold, confirming that the target pollutant is a potential environmental risk substance.
In the embodiment of the present application, an Expected Environmental Risk (EER) is taken as a criterion, and if the expected environmental risk is greater than a preset first expected environmental risk threshold, the target pollutant is determined to be a potential environmental risk substance.
In the embodiment of the present application, as an optional embodiment, the first expected environmental risk threshold is set to 1%, and for the pollutants with the expected environmental risk greater than 1%, the pollutants are identified as potential environmental risk substances, while for the pollutants with the expected environmental risk not greater than 1%, the environmental risk is negligible, and no further evaluation is needed, and the pollutants are identified as non-environmental risk substances.
In this embodiment, as an optional embodiment, after confirming that the target pollutant is a potential environmental risk substance, the method further includes:
risk ranking the target pollutant based on the expected environmental risk.
In the embodiment of the application, for a pollutant with an expected environmental risk greater than 1%, the pollutant is determined as a potential environmental risk substance, and the pollutant is subjected to risk classification.
In this embodiment, as an optional embodiment, based on the expected environmental risk, the risk classification of the target pollutant includes:
if the expected environmental risk is larger than a preset first expected environmental risk threshold and is smaller than or equal to a second expected environmental risk threshold, determining that the target pollutant is a low environmental risk substance;
if the expected environmental risk is larger than a preset second expected environmental risk threshold and is smaller than or equal to a third expected environmental risk threshold, determining that the target pollutant is a medium environmental risk substance;
and if the expected environmental risk is greater than a preset third expected environmental risk threshold value, determining that the target pollutant is a high environmental risk substance.
In the embodiment of the present application, as an optional embodiment, the second expected environmental risk threshold is set to 10%, and the third expected environmental risk threshold is set to 30%, that is:
if EER is more than 30%, confirming that the target pollutant is a high-environmental risk substance;
if the EER is more than 10% and less than or equal to 30%, determining that the target pollutant is a medium environmental risk substance;
if the EER is more than 1% and less than or equal to 10%, determining that the target pollutant is a low-environmental-risk substance;
if EER is less than or equal to 1%, the risk of the target pollutant is determined to be negligible, and the target pollutant is a non-environmental risk substance.
In the embodiment of the application, the method is used for rapidly screening the pollutants with the environmental risks in the watershed water environment by establishing the hierarchical screening method of the watershed water environment risk pollutants. Specifically, a step-by-step risk screening and evaluating method is adopted to carry out level environmental risk evaluation on pollutants in the watershed water environment. And starting from the evaluation of the low level, and carrying out the evaluation of the next level after the evaluation result exceeds the preset screening standard. In the embodiment of the application, the evaluation is divided into 3 levels, the pollutant risk level is divided according to the evaluation results of the 1 st to 3 rd levels, and substances with environmental risks are identified. And when the exposure concentration of the pollutants is greater than the environmental safety threshold, performing level 2 evaluation, and when the probability that the exposure concentration distribution of the pollutants subjected to the level 2 evaluation exceeds the environmental safety threshold is greater than 1%, performing level 3 evaluation, and dividing the risk level of each pollutant according to the evaluation result of the level 3. Because not every pollutant needs to be subjected to complicated 3 rd-level evaluation, the method can improve the screening efficiency of the environmental risk substances, save manpower and material resources and effectively improve the environmental risk management level of the pollutants under the condition of multi-pollutant risk screening in a drainage basin. Further, by using a simple low-level assessment, if a contaminant shows a risk, a high-level assessment is performed again, and a quantitative assessment result (expected environmental risk) can be given for the substance at risk.
Fig. 2 is another schematic flow chart of the method for screening watershed water environment risk substances according to the embodiment of the invention.
As shown in fig. 2, the process includes:
in the embodiment of the present application, different contaminants may correspond to different PNECs.
step 209 confirms that the risk of the contamination is negligible.
Fig. 3 is a schematic structural diagram of a device for screening watershed water environment risk substances according to an embodiment of the invention. As shown in fig. 3, the apparatus includes:
the exposure concentration processing module 301 is configured to obtain exposure concentrations of pollutants in a water environment of a target watershed, and compare the exposure concentrations with a preset environmental safety threshold;
in the embodiment of the present application, as an optional embodiment, the exposure concentration of each pollutant may be obtained from publicly published documents by querying network data, or the exposure concentration of each pollutant at each sampling point may be actually determined by sampling a water sample from a target process water environment. In the embodiment of the present application, as another optional embodiment, different pollutants and methods for determining the exposure concentration may also be different, and specifically, according to the published relevant standard sampling method and testing method, in the water environment of the target watershed, a water sample is collected according to a preset sampling point principle, and then the exposure concentration of each pollutant contained in the water sample is measured.
A probability calculation module 302, configured to obtain an exposure concentration of a target pollutant greater than the environmental safety threshold, construct a cumulative probability distribution curve of the target pollutant based on the exposure concentration of the target pollutant, and calculate a probability that the target pollutant exceeds the environmental safety threshold based on the cumulative probability distribution curve;
in the embodiment of the present application, as an optional embodiment, each pollutant corresponds to an environmental safety threshold, and the environmental safety thresholds corresponding to different pollutants may be the same or different.
An expected environmental risk obtaining module 303, configured to quantify an environmental risk of the target pollutant according to preset software based on pre-obtained aquatic toxicity data of the target pollutant and an exposure concentration of the target pollutant if the probability is greater than a preset probability threshold, and obtain an expected environmental risk of the target pollutant based on the quantified environmental risk;
in the embodiment of the application, as an optional embodiment, the environmental risk of the target pollutant is quantified by combining and plotting the cumulative probability of toxicity data of the pollutant aquatic organisms and the cumulative probability of the pollutant exposure concentration, and the area under a quantified curve represents the expected environmental risk.
The risk assessment module 304 identifies the target pollutant as a potentially environmentally risky substance if the expected environmental risk is greater than a first preset expected environmental risk threshold.
In the embodiment of the application, the expected environmental risk is taken as a criterion, and if the expected environmental risk is greater than a preset first expected environmental risk threshold, the target pollutant is determined to be a potential environmental risk substance.
In this embodiment, as an optional embodiment, the apparatus further includes:
a risk ranking module (not shown) for risk ranking the target pollutant based on the expected environmental risk.
In this embodiment, as an optional embodiment, the risk classification module is specifically configured to:
if the expected environmental risk is larger than a preset first expected environmental risk threshold and is smaller than or equal to a second expected environmental risk threshold, determining that the target pollutant is a low environmental risk substance;
if the expected environmental risk is larger than a preset second expected environmental risk threshold and is smaller than or equal to a third expected environmental risk threshold, determining that the target pollutant is a medium environmental risk substance;
and if the expected environmental risk is greater than a preset third expected environmental risk threshold value, determining that the target pollutant is a high environmental risk substance.
In the embodiment of the present application, as an optional embodiment, the first expected environmental risk threshold is set to 1%, the second expected environmental risk threshold is set to 10%, the third expected environmental risk threshold is set to 30%, and the probability threshold is set to 1%.
In this embodiment, as an alternative, the environmental safety threshold includes a predicted no-effect concentration.
In this embodiment of the present application, as an optional embodiment, the expected environmental risk obtaining module 303 is further configured to:
and if the exposure concentration of the pollutant is less than the environmental safety threshold value, confirming that the pollutant is a non-environmental risk substance.
In this embodiment of the application, as an optional embodiment, the risk assessment module 304 is further configured to:
and if the expected environmental risk is not greater than a preset first expected environmental risk threshold value, determining that the target pollutant is a non-environmental risk substance.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for screening watershed water environment risk substances is characterized by comprising the following steps:
obtaining the exposure concentration of each pollutant in the water environment of the target watershed, and comparing the exposure concentration with a preset environmental safety threshold;
acquiring the exposure concentration of a target pollutant which is greater than the environmental safety threshold, constructing a cumulative probability distribution curve of the target pollutant based on the exposure concentration of the target pollutant, calculating the probability that the exposure concentration of the target pollutant exceeds the environmental safety threshold based on the cumulative probability distribution curve, corresponding a pollutant to the cumulative probability distribution curve, and constructing the cumulative probability distribution curve of the target pollutant by using the following lognormal distribution function:
in the formula (I), the compound is shown in the specification,
y is the cumulative probability of the target pollutant,%;
x is the exposure concentration of the target pollutant, mu g/L;
u is the average value of the exposure concentration of the target pollutant, and is microgram/L;
σ is the standard deviation of the exposure concentration of the target pollutant, μ g/L;
if the probability is larger than a preset probability threshold value, quantifying the environmental risk of the target pollutant according to preset software based on the aquatic organism toxicity data of the target pollutant and the exposure concentration of the target pollutant, and obtaining the expected environmental risk of the target pollutant based on the quantified environmental risk;
and if the expected environmental risk is greater than a preset first expected environmental risk threshold value, confirming that the target pollutant is a potential environmental risk substance.
2. The method of claim 1, wherein after identifying the target contaminant as a potentially environmentally hazardous substance, the method further comprises:
risk ranking the target pollutant based on the expected environmental risk.
3. The method of claim 2, wherein said risk-ranking the target pollutant based on the expected environmental risk comprises:
if the expected environmental risk is larger than a preset first expected environmental risk threshold and is smaller than or equal to a second expected environmental risk threshold, determining that the target pollutant is a low environmental risk substance;
if the expected environmental risk is larger than a preset second expected environmental risk threshold and is smaller than or equal to a third expected environmental risk threshold, determining that the target pollutant is a medium environmental risk substance;
and if the expected environmental risk is greater than a preset third expected environmental risk threshold value, determining that the target pollutant is a high environmental risk substance.
4. The method of claim 3, wherein the first expected environmental risk threshold is set at 1%, the second expected environmental risk threshold is set at 10%, and the third expected environmental risk threshold is set at 30%.
5. The method of any of claims 1 to 4, wherein the environmental safety threshold comprises a predicted no-effect concentration.
6. The method according to any one of claims 1 to 4, further comprising:
and if the exposure concentration of the pollutant is less than the environmental safety threshold value, confirming that the pollutant is a non-environmental risk substance.
7. The method according to any one of claims 1 to 4, further comprising:
and if the expected environmental risk is not greater than a preset first expected environmental risk threshold value, determining that the target pollutant is a non-environmental risk substance.
8. An apparatus for screening watershed water environment risk substances, comprising:
the exposure concentration processing module is used for acquiring the exposure concentration of each pollutant in the water environment of the target watershed and comparing the exposure concentration with a preset environment safety threshold;
a probability calculation module for obtaining the exposure concentration of the target pollutant greater than the environmental safety threshold, constructing a cumulative probability distribution curve based on the exposure concentration of the target pollutant, calculating the probability that the exposure concentration of the target pollutant exceeds the environmental safety threshold based on the cumulative probability distribution curve,
a pollutant corresponds to a cumulative probability distribution curve, and the cumulative probability distribution curve of the target pollutant is constructed by using a lognormal distribution function as follows:
in the formula (I), the compound is shown in the specification,
y is the cumulative probability of the target pollutant,%;
x is the exposure concentration of the target pollutant, mu g/L;
u is the average value of the exposure concentration of the target pollutant, and is microgram/L;
σ is the standard deviation of the exposure concentration of the target pollutant, μ g/L;
an expected environmental risk obtaining module, which quantifies the environmental risk of the target pollutant according to preset software based on aquatic organism toxicity data of the target pollutant and the exposure concentration of the target pollutant obtained in advance if the probability is greater than a preset probability threshold, and obtains the expected environmental risk of the target pollutant based on the quantified environmental risk;
and the risk evaluation module confirms that the target pollutant is a potential environmental risk substance if the expected environmental risk is greater than a preset first expected environmental risk threshold value.
9. The apparatus of claim 8, further comprising:
a risk ranking module to rank the risk of the target pollutant based on the expected environmental risk.
10. The apparatus according to claim 9, wherein the risk ranking module is specifically configured to:
if the expected environmental risk is larger than a preset first expected environmental risk threshold and is smaller than or equal to a second expected environmental risk threshold, determining that the target pollutant is a low environmental risk substance;
if the expected environmental risk is larger than a preset second expected environmental risk threshold and is smaller than or equal to a third expected environmental risk threshold, determining that the target pollutant is a medium environmental risk substance;
and if the expected environmental risk is greater than a preset third expected environmental risk threshold value, determining that the target pollutant is a high environmental risk substance.
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| CN105279356A (en) * | 2014-07-04 | 2016-01-27 | 中国环境科学研究院 | Method and device for obtaining criteria priority research pollutant of water environment |
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