A method for determining a target value for remediation of soil and groundwater contaminated by petroleum hydrocarbons

Abstract

The application provides a method for determining a soil and groundwater petroleum hydrocarbon pollution remediation target value, and belongs to the technical field of pollution prevention and control. The method divides aliphatic hydrocarbons and aromatic hydrocarbons into five carbon chain intervals of C6-C9, C10-C12, C13-C16, C17-C21 and C22-C40, and determines a soil sample petroleum hydrocarbon pollution remediation target value and a groundwater sample petroleum hydrocarbon pollution remediation target value based on the five carbon chain intervals. The petroleum hydrocarbon pollution remediation target value can reflect the environmental risks of different carbon chain intervals in total petroleum hydrocarbons and is unique, and a more reliable evaluation standard for the petroleum hydrocarbon pollution remediation effect is given, so that problems such as insufficient remediation or excessive remediation caused by unreasonable remediation target setting can be prevented.

Description

Technical Field

[0001] This invention relates to the field of pollution prevention and control technology, and in particular to a method for determining target values ​​for the remediation of petroleum hydrocarbon pollution in soil and groundwater. Background Technology

[0002] Total petroleum hydrocarbons (TPH) pollution sources include processes such as oil extraction, storage, transportation, refining, and industrial emissions. Petroleum hydrocarbons have a complex composition, and components with different carbon chain lengths exhibit significant differences in mobility, toxicity, and degradability in the environment.

[0003] Currently, both domestically and internationally, remediation goals for petroleum hydrocarbon pollution are mainly determined using either a single limit method based on total petroleum hydrocarbons (TPH) or a risk-based segmented assessment method. However, neither of these methods can provide a single, universally applicable remediation goal that reflects the environmental risk of different carbon chain ranges (C10-C40) within total petroleum hydrocarbons (such as C6-C9, C10-C12, C13-C16, C17-C21, and C22-C40). Consequently, a reliable evaluation standard for the effectiveness of petroleum hydrocarbon pollution remediation cannot be established, leading to unreasonable remediation target setting and problems such as insufficient or excessive remediation. Summary of the Invention

[0004] This invention proposes a method for determining remediation target values ​​for petroleum hydrocarbon pollution in soil and groundwater. Aliphatic hydrocarbons and aromatic hydrocarbons are divided into five carbon chain intervals: C6-C9, C10-C12, C13-C16, C17-C21, and C22-C40. Based on these five carbon chain intervals, remediation target values ​​for petroleum hydrocarbon pollution in soil samples and groundwater samples are determined. These remediation target values ​​reflect the environmental risk of different carbon chain intervals within the total petroleum hydrocarbons and are unique. This provides a relatively reliable evaluation standard for the effectiveness of petroleum hydrocarbon pollution remediation, thereby preventing problems such as insufficient or excessive remediation due to unreasonable remediation target settings.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A method for determining target values ​​for the remediation of petroleum hydrocarbon pollution in soil and groundwater, comprising:

[0007] Collect petroleum hydrocarbon test samples from the target remediation site; the petroleum hydrocarbon test samples include soil samples and groundwater samples from the target remediation site;

[0008] The concentrations of petroleum hydrocarbons in soil samples and groundwater samples were determined separately. The petroleum hydrocarbon concentrations included the concentrations of petroleum hydrocarbons within each of multiple carbon chain intervals. These multiple carbon chain intervals included aliphatic hydrocarbons C6-C9, aliphatic hydrocarbons C10-C12, aliphatic hydrocarbons C13-C16, aliphatic hydrocarbons C17-C21, aliphatic hydrocarbons C22-C40, aromatic hydrocarbons C6-C9, aromatic hydrocarbons C10-C12, aromatic hydrocarbons C13-C16, aromatic hydrocarbons C17-C21, and aromatic hydrocarbons C22-C40.

[0009] The percentage of petroleum hydrocarbon concentration in each carbon chain interval of the soil sample and the percentage of petroleum hydrocarbon concentration in the groundwater sample were calculated using the petroleum hydrocarbon concentration in the soil sample and the groundwater sample, respectively. The percentage of petroleum hydrocarbon concentration in the soil sample includes the ratio of the petroleum hydrocarbon concentration in each carbon chain interval to the total petroleum hydrocarbon concentration in the soil sample. The percentage of petroleum hydrocarbon concentration in the groundwater sample includes the ratio of the petroleum hydrocarbon concentration in each carbon chain interval to the total petroleum hydrocarbon concentration in the groundwater sample.

[0010] The target value (CL) for petroleum hydrocarbon pollution remediation in soil samples was calculated using the concentration percentage of petroleum hydrocarbons in each carbon chain region, the petroleum hydrocarbon hazard quotient, and the risk control value. s The target remediation value (CL) for petroleum hydrocarbon pollution in groundwater samples was calculated using the concentration percentage of petroleum hydrocarbons in each carbon chain region, the petroleum hydrocarbon hazard quotient, and the risk control value. gw .

[0011] In one implementation of the present invention, the target value CL for remediation of petroleum hydrocarbon pollution in soil samples is... s The following formula must be satisfied;

[0012]

[0013] Target value (CL) for remediation of petroleum hydrocarbon contamination in groundwater samples gw The following formula must be satisfied;

[0014]

[0015] Where s represents soil, i represents the i-th carbon chain interval in a plurality of carbon chain intervals, n is the number of the plurality of carbon chain intervals, and HI s,i ω represents the petroleum hydrocarbon hazard quotient located in the i-th carbon chain region of the soil sample. s,i HCV represents the percentage of petroleum hydrocarbon concentration in the i-th carbon chain region of a soil sample. s,i HCV represents the risk control value of petroleum hydrocarbons in the i-th carbon chain interval of a soil sample, where j represents the j-th carbon chain interval among multiple carbon chain intervals. s,jω represents the risk control value of petroleum hydrocarbons in the j-th carbon chain interval of a soil sample. s,j This represents the percentage of petroleum hydrocarbon concentration in the j-th carbon chain region of the soil sample; gw represents groundwater, HI gw,i ω represents the hazard quotient of petroleum hydrocarbons in the i-th carbon chain segment of a groundwater sample. gw,i HCV represents the percentage of petroleum hydrocarbon concentration in the i-th carbon chain region of a groundwater sample. gw,i HCV represents the risk control value of petroleum hydrocarbons in the i-th carbon chain region of a groundwater sample. gw,j ω represents the risk control value of petroleum hydrocarbons in the j-th carbon chain interval of a groundwater sample. gw,j This represents the percentage of petroleum hydrocarbon concentration in the j-th carbon chain interval of the groundwater sample.

[0016] In one implementation of the present invention, the petroleum hydrocarbon hazard quotient and risk control value of the soil sample are determined based on the petroleum hydrocarbon concentration, exposure pathway, and pollution risk assessment algorithm of the soil sample.

[0017] Based on the petroleum hydrocarbon concentration, exposure pathways, and pollution risk assessment algorithms of groundwater samples, the petroleum hydrocarbon hazard quotient and risk control value of groundwater samples are determined.

[0018] In one implementation of the present invention, the pollution risk assessment algorithm is based on the "Technical Guidelines for Soil Pollution Risk Assessment of Construction Land" (HJ 25.3-2019).

[0019] In one implementation of the present invention:

[0020] Regarding the exposure pathways of soil samples: When the sampling depth of soil samples is less than or equal to 50 cm, the exposure pathways of soil samples include oral ingestion of soil particles, skin contact with soil particles, inhalation of soil particles, and inhalation of gaseous pollutants from the top layer of soil in outdoor air; when the sampling depth of soil samples is in the range of 0.5-20 m, the exposure pathways of soil samples include inhalation of gaseous pollutants from the lower layer of soil in outdoor air and inhalation of gaseous pollutants from the lower layer of soil in indoor air.

[0021] Exposure pathways for groundwater samples include inhalation of gaseous pollutants from groundwater in outdoor air, inhalation of gaseous pollutants from groundwater in indoor air, and drinking groundwater.

[0022] Compared with the prior art, the present invention has the following beneficial effects.

[0023] This invention provides a method for determining remediation target values ​​for petroleum hydrocarbon pollution in soil and groundwater. Aliphatic hydrocarbons and aromatic hydrocarbons are divided into five carbon chain intervals: C6-C9, C10-C12, C13-C16, C17-C21, and C22-C40. Based on these five carbon chain intervals, the percentage of petroleum hydrocarbon concentration in each interval of the soil sample and the percentage of petroleum hydrocarbon concentration in each carbon chain interval of the groundwater sample are determined. Finally, the percentages of petroleum hydrocarbon concentration in each carbon chain interval of the soil sample and the groundwater sample are combined with the petroleum hydrocarbon hazard quotient and risk control value to derive the remediation target values ​​for petroleum hydrocarbon pollution in the soil sample and the groundwater sample. The petroleum hydrocarbon pollution remediation target values ​​derived through the above process provide a unique remediation target value that reflects the environmental risk of different carbon chain intervals in the total petroleum hydrocarbons. This provides a relatively reliable evaluation standard for the remediation effect of petroleum hydrocarbon pollution, preventing problems such as insufficient or excessive remediation due to unreasonable remediation target setting. Attached Figure Description

[0024] Figure 1 This is one of the schematic diagrams of a method for determining the remediation target value of petroleum hydrocarbon pollution in soil and groundwater provided in the embodiments of this application;

[0025] Figure 2 This is the second schematic diagram of a method for determining the target value for remediation of petroleum hydrocarbon pollution in soil and groundwater provided in the embodiments of this application. Detailed Implementation

[0026] In the specification and claims of this invention, the terms "first" and "second," etc., are used to distinguish different objects, rather than to describe a specific order of objects.

[0027] In the embodiments of this application, "and / or" indicates a relationship between objects. For example, A and / or B can represent the following three situations: A exists alone, B exists alone, and A and B exist simultaneously.

[0028] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0029] In the description of this invention, "petroleum hydrocarbon C10-C40" means petroleum hydrocarbons with a carbon chain length ranging from 10 to 40 carbon atoms. "Aliphatic hydrocarbon C6-C9" means aliphatic hydrocarbons with a carbon chain length ranging from 6 to 9 carbon atoms; "Aliphatic hydrocarbon C10-C12" means aliphatic hydrocarbons with a carbon chain length ranging from 10 to 12 carbon atoms; "Aliphatic hydrocarbon C13-C16" means aliphatic hydrocarbons with a carbon chain length ranging from 13 to 16 carbon atoms; "Aliphatic hydrocarbon C17-C21" means aliphatic hydrocarbons with a carbon chain length ranging from 17 to 21 carbon atoms; and "Aliphatic hydrocarbon C22-C40" means aliphatic hydrocarbons with a carbon chain length ranging from 22 to 40 carbon atoms. "Aromatic hydrocarbons C6-C9" refers to aromatic hydrocarbons with a carbon chain length of 6 to 9 carbon atoms; "Aromatic hydrocarbons C10-C12" refers to aromatic hydrocarbons with a carbon chain length of 10 to 12 carbon atoms; "Aromatic hydrocarbons C13-C16" refers to aromatic hydrocarbons with a carbon chain length of 13 to 16 carbon atoms; "Aromatic hydrocarbons C17-C21" refers to aromatic hydrocarbons with a carbon chain length of 17 to 21 carbon atoms; and "Aromatic hydrocarbons C22-C40" refers to aromatic hydrocarbons with a carbon chain length of 22 to 40 carbon atoms.

[0030] The method provided in this application relates to the prevention and control of soil and groundwater pollution, and can be used to determine the remediation target values ​​for soil petroleum hydrocarbon pollution and groundwater petroleum hydrocarbon pollution.

[0031] Understandably, petroleum hydrocarbon pollution refers to the pollution of soil and water bodies (such as groundwater) caused by the release of hydrocarbons (hydrocarbons) contained in petroleum and its derivatives into the environment. Specifically, short-chain aliphatic hydrocarbons (C6-C9) in petroleum hydrocarbons are volatile, while long-chain aliphatic hydrocarbons (C22-C40) have strong adsorption and persistence; aromatic hydrocarbons (such as benzene series and polycyclic aromatic hydrocarbons) have a higher risk of carcinogenesis.

[0032] Currently, methods for determining remediation target values ​​for petroleum hydrocarbon pollution both domestically and internationally include the single limit method based on total petroleum hydrocarbons (TPH) and the risk-based segmented assessment method. The single limit method based on TPH (such as GB 36600-2018) only distinguishes between total petroleum hydrocarbons but does not consider the differences in toxicity and environmental behavior of different carbon chain components within TPH, potentially leading to biased remediation decisions. Some studies in the risk-based segmented assessment method attempt to divide petroleum hydrocarbons into different carbon number ranges (such as C6-C9, C10-C16, C16-C34, etc.) and calculate their respective risk values ​​as remediation target values. However, this method involves calculating multiple remediation target values ​​based on carbon number ranges, requiring simultaneous measurement of petroleum hydrocarbon concentrations across multiple carbon number ranges during remediation acceptance, increasing testing costs.

[0033] Therefore, to address the problem that existing methods for determining remediation target values ​​for petroleum hydrocarbon pollution in the background art cannot provide a reliable evaluation standard for the remediation effect, leading to unreasonable remediation target setting and resulting in insufficient or excessive remediation, this application provides a method for determining remediation target values ​​for petroleum hydrocarbon pollution in soil and groundwater. Aliphatic hydrocarbons and aromatic hydrocarbons are divided into five carbon chain intervals: C6-C9, C10-C12, C13-C16, C17-C21, and C22-C40. Based on these five carbon chain intervals, remediation target values ​​for petroleum hydrocarbon pollution in soil samples and groundwater samples are determined. These remediation target values ​​reflect the environmental risk of different carbon chain intervals in total petroleum hydrocarbons and are unique, providing a reliable evaluation standard for the remediation effect of petroleum hydrocarbon pollution. This prevents problems such as insufficient or excessive remediation due to unreasonable remediation target setting.

[0034] like Figure 1 As shown in the embodiments of this application, a method for determining the target value for remediation of petroleum hydrocarbon pollution in soil and groundwater includes S101-S105.

[0035] S101. Collect petroleum hydrocarbon test samples from the target remediation site.

[0036] The petroleum hydrocarbon test samples included soil and groundwater samples from the target remediation site.

[0037] S102. Determine the concentration of petroleum hydrocarbons in soil samples and groundwater samples, respectively.

[0038] The concentration of petroleum hydrocarbons includes the concentration of petroleum hydrocarbons in each of the multiple carbon chain intervals; the multiple carbon chain intervals include aliphatic hydrocarbons C6-C9, aliphatic hydrocarbons C10-C12, aliphatic hydrocarbons C13-C16, aliphatic hydrocarbons C17-C21, aliphatic hydrocarbons C22-C40, aromatic hydrocarbons C6-C9, aromatic hydrocarbons C10-C12, aromatic hydrocarbons C13-C16, aromatic hydrocarbons C17-C21, and aromatic hydrocarbons C22-C40.

[0039] Therefore, the concentration of petroleum hydrocarbons in the above soil samples includes the concentrations of aliphatic hydrocarbons C6-C9, aliphatic hydrocarbons C13-C16, aliphatic hydrocarbons C17-C21, aliphatic hydrocarbons C22-C40, aromatic hydrocarbons C6-C9, aromatic hydrocarbons C10-C12, aromatic hydrocarbons C13-C16, aromatic hydrocarbons C17-C21, and aromatic hydrocarbons C22-C40.

[0040] The petroleum hydrocarbon concentrations in the aforementioned groundwater samples include the concentrations of aliphatic hydrocarbons C6-C9, aliphatic hydrocarbons C13-C16, aliphatic hydrocarbons C17-C21, aliphatic hydrocarbons C22-C40, aromatic hydrocarbons C6-C9, aromatic hydrocarbons C10-C12, aromatic hydrocarbons C13-C16, aromatic hydrocarbons C17-C21, and aromatic hydrocarbons C22-C40.

[0041] S103. Calculate the percentage of petroleum hydrocarbon concentration in each carbon chain region of the soil sample and the percentage of petroleum hydrocarbon concentration in each carbon chain region of the groundwater sample, respectively, based on the petroleum hydrocarbon concentration in the soil sample and the petroleum hydrocarbon concentration in the groundwater sample.

[0042] The percentage of petroleum hydrocarbon concentration in each carbon chain interval of the soil samples mentioned above includes the ratio of the petroleum hydrocarbon concentration in each carbon chain interval of the soil sample to the total petroleum hydrocarbon concentration (C10-C40) of the soil sample. The percentage of petroleum hydrocarbon concentration in each carbon chain interval of the groundwater samples also includes the ratio of the petroleum hydrocarbon concentration in each carbon chain interval of the groundwater sample to the total petroleum hydrocarbon concentration of the groundwater sample.

[0043] Specifically, the percentage of petroleum hydrocarbon concentration in each carbon chain range of the aforementioned soil samples includes the mass fraction of aliphatic hydrocarbon C6-C9 concentration, aliphatic hydrocarbon C13-C16 concentration, aliphatic hydrocarbon C17-C21 concentration, aliphatic hydrocarbon C22-C40 concentration, aromatic hydrocarbon C6-C9 concentration, aromatic hydrocarbon C10-C12 concentration, aromatic hydrocarbon C13-C16 concentration, aromatic hydrocarbon C17-C21 concentration, and aromatic hydrocarbon C22-C40 concentration.

[0044] The percentage of petroleum hydrocarbon concentration in each carbon chain range in the above-mentioned groundwater samples includes the mass fraction of aliphatic hydrocarbon C6-C9 concentration in the soil sample, the mass fraction of aliphatic hydrocarbon C13-C16 concentration in the soil sample, the mass fraction of aliphatic hydrocarbon C17-C21 concentration in the soil sample, the mass fraction of aliphatic hydrocarbon C22-C40 concentration in the soil sample, the mass fraction of aromatic hydrocarbon C6-C9 concentration in the soil sample, the mass fraction of aromatic hydrocarbon C10-C12 concentration in the soil sample, the mass fraction of aromatic hydrocarbon C13-C16 concentration in the soil sample, the mass fraction of aromatic hydrocarbon C17-C21 concentration in the soil sample, and the mass fraction of aromatic hydrocarbon C22-C40 concentration in the soil sample.

[0045] For example, the concentration ratio of petroleum hydrocarbons in each carbon chain region of the above soil samples satisfies: The concentration ratio of petroleum hydrocarbons in each carbon chain range of the above groundwater samples satisfies the following: Where s represents soil, i represents the i-th carbon chain interval in a plurality of carbon chain intervals and 1≤i≤n, n is the number of the plurality of carbon chain intervals, and ω s,i C represents the percentage of petroleum hydrocarbon concentration in the i-th carbon chain region of a soil sample. s,i C represents the concentration of petroleum hydrocarbons in the i-th carbon chain interval of the soil sample, j represents the j-th carbon chain interval among multiple carbon chain intervals, and C s,j This represents the concentration of petroleum hydrocarbons in the j-th carbon chain region of the soil sample; gw represents groundwater, ω gw,i C represents the percentage of petroleum hydrocarbon concentration in the i-th carbon chain region of a groundwater sample. gw,i C represents the concentration of petroleum hydrocarbons in the i-th carbon chain region of a groundwater sample. gw,j This represents the concentration of petroleum hydrocarbons in the j-th carbon chain segment of a groundwater sample.

[0046] S104. Using the concentration percentage of petroleum hydrocarbons in each carbon chain region of the soil sample, the petroleum hydrocarbon hazard quotient, and the risk control value, calculate the petroleum hydrocarbon pollution remediation target value CL for the soil sample. s The target remediation value (CL) for petroleum hydrocarbon pollution in groundwater samples was calculated using the concentration percentage of petroleum hydrocarbons in each carbon chain region, the petroleum hydrocarbon hazard quotient, and the risk control value. gw .

[0047] In one implementation method, the target value CL for remediation of petroleum hydrocarbon pollution in soil samples is... s It satisfies the following formula (1).

[0048]

[0049] Target value (CL) for remediation of petroleum hydrocarbon contamination in groundwater samples gw It satisfies the following formula (2).

[0050]

[0051] Among them, HI s,i ω represents the petroleum hydrocarbon hazard quotient located in the i-th carbon chain region of the soil sample. s,i HCV represents the percentage of petroleum hydrocarbon concentration in the i-th carbon chain region of a soil sample. s,i HCV represents the risk control value of petroleum hydrocarbons in the i-th carbon chain region of a soil sample. s,j ω represents the risk control value of petroleum hydrocarbons in the j-th carbon chain interval of a soil sample. s,j HI represents the percentage of petroleum hydrocarbon concentration in the j-th carbon chain region of the soil sample. gw,i ω represents the hazard quotient of petroleum hydrocarbons in the i-th carbon chain segment of a groundwater sample. gw,i HCV represents the percentage of petroleum hydrocarbon concentration in the i-th carbon chain region of a groundwater sample. gw,i HCV represents the risk control value of petroleum hydrocarbons in the i-th carbon chain region of a groundwater sample. gw,j ω represents the risk control value of petroleum hydrocarbons in the j-th carbon chain interval of a groundwater sample. gw,j This represents the percentage of petroleum hydrocarbon concentration in the j-th carbon chain interval of the groundwater sample.

[0052] Understandably, if there are multiple petroleum hydrocarbon test sample results, for each carbon chain interval in the multiple petroleum hydrocarbon test sample results, the maximum concentration among the multiple petroleum hydrocarbon test sample results is taken to calculate the petroleum hydrocarbon pollution remediation target value.

[0053] Optionally, combined Figure 1 ,like Figure 2 As shown, before S104, the method further includes S105 and S106.

[0054] S105. Based on the petroleum hydrocarbon concentration, exposure pathway, and pollution risk assessment algorithm of the soil sample, determine the petroleum hydrocarbon hazard quotient and risk control value of the soil sample.

[0055] The pollution risk assessment algorithm is based on the "Technical Guidelines for Soil Pollution Risk Assessment of Construction Land" (HJ 25.3-2019).

[0056] Regarding the exposure pathways of soil samples:

[0057] When the sampling depth of soil samples is less than or equal to 50 cm, the exposure routes of soil samples include oral ingestion of soil particles, skin contact with soil particles, inhalation of soil particles, and inhalation of gaseous pollutants from the surface soil in outdoor air.

[0058] Under the above conditions, the formula for calculating the petroleum hydrocarbon hazard quotient HI of the soil sample is as follows.

[0059]

[0060] Among them, OISER nc This indicates the amount of soil exposure (non-carcinogenic effect) ingested orally, expressed in kg soil·kg. -1 Weight·d -1 DCSER nc This indicates the amount of soil exposure through skin contact (non-carcinogenic effect), expressed in kg soil·kg. -1 Weight·d -1 ;PISER nc This indicates soil exposure to inhaled soil particulate matter (non-carcinogenic effect), expressed in kg soil·kg. -1 Weight·d -1 IOVER nc1 This indicates the soil exposure (non-carcinogenic effect) corresponding to gaseous pollutants from surface soil in inhaled outdoor air, expressed in kg soil·kg. -1 Weight·d -1 C sur This indicates the concentration of pollutants in the topsoil, expressed in mg·kg⁻¹. -1 ;RfD o Indicates the oral reference dose; RfD d Indicates the reference dose for skin contact; RfD i The reference dose is indicated by inhalation, and SAF indicates the reference dose allocation for soil exposure.

[0061] The formula for calculating the risk control value of soil samples is as follows.

[0062]

[0063] AHQ stands for Acceptable Hazard Quotient.

[0064] When the soil sample is taken at a depth of 0.5-20m, the exposure pathways of the soil sample include inhalation of gaseous pollutants from the lower soil layer in outdoor air and inhalation of gaseous pollutants from the lower soil layer in indoor air.

[0065] Under the above circumstances, the formula for calculating the petroleum hydrocarbon hazard quotient of soil samples is as follows.

[0066]

[0067] Among them, IOVER nc2 This indicates the soil exposure (non-carcinogenic effect) corresponding to gaseous pollutants from the lower soil layer in outdoor air, expressed in kg soil·kg. -1 Weight·d -1 IIVER nc1 This indicates the soil exposure (non-carcinogenic effect) corresponding to gaseous pollutants from the lower soil layer in inhaled indoor air, expressed in kg soil·kg. -1 Weight·d -1 C sur This indicates the concentration of pollutants in the topsoil, expressed in mg·kg⁻¹. -1 .

[0068] The formula for calculating the risk control value of soil samples is as follows.

[0069]

[0070] Among them, IOVER nc2 This indicates the soil exposure (non-carcinogenic effect) corresponding to gaseous pollutants from the lower soil layer in outdoor air, expressed in kg soil·kg. -1 Weight·d -1 IIVER nc1 This indicates the soil exposure (non-carcinogenic effect) corresponding to gaseous pollutants from the lower soil layer in inhaled indoor air, expressed in kg soil·kg. -1 Weight·d -1 C sur This indicates the concentration of pollutants in the topsoil, expressed in mg·kg⁻¹. -1 ;RfD i This indicates the reference dose for inhalation.

[0071] S106. Based on the petroleum hydrocarbon concentration, exposure pathway, and pollution risk assessment algorithm of the groundwater sample, determine the petroleum hydrocarbon hazard quotient and risk control value of the groundwater sample.

[0072] Exposure pathways for groundwater samples include inhalation of gaseous pollutants from groundwater in outdoor air, inhalation of gaseous pollutants from groundwater in indoor air, and drinking groundwater.

[0073] The formula for calculating the petroleum hydrocarbon hazard quotient of the above groundwater samples is as follows.

[0074]

[0075] Among them, IOVER nc3This indicates the groundwater exposure (non-carcinogenic effect) corresponding to the inhalation of gaseous pollutants from groundwater in outdoor air, expressed in L groundwater·kg. -1 Weight·d -1 IIVER nc2 This indicates the groundwater exposure (non-carcinogenic effect) corresponding to gaseous pollutants from groundwater inhaled indoor air, expressed in L groundwater·kg. -1 Weight·d -1 C gw This indicates the concentration of pollutants in groundwater, expressed in mg·L. -1 ;RfD i The reference dose is indicated by inhalation; the WAF indicates the reference dose allocation ratio for exposure to groundwater.

[0076] The formula for calculating the risk control value of the above groundwater samples is as follows.

[0077]

[0078] Among them, IOVER nc3 This indicates the groundwater exposure (non-carcinogenic effect) corresponding to the inhalation of gaseous pollutants from groundwater in outdoor air, expressed in L groundwater·kg. -1 Weight·d -1 IIVER nc2 This indicates the groundwater exposure (non-carcinogenic effect) corresponding to gaseous pollutants from groundwater inhaled indoor air, expressed in L groundwater·kg. -1 Weight·d -1 ;RfD i The reference dose for inhalation is indicated by WAF; the reference dose allocation for groundwater exposure is indicated by AHQ.

[0079] In one application scenario of the method for determining the remediation target value of petroleum hydrocarbon pollution in soil and groundwater provided in this application embodiment, the petroleum hydrocarbon concentration, petroleum hydrocarbon concentration ratio (corresponding to ω in Table 1), petroleum hydrocarbon hazard quotient (corresponding to HI in Table 1), and risk control value (corresponding to HCWS in Table 1) of a soil sample in a petrochemical site, as well as related data, are obtained as shown in Table 1 below.

[0080] Table 1. Data on petroleum hydrocarbons in soil at a petrochemical site.

[0081]

[0082]

[0083] Substituting the data in Table 1 above into the formula (1) above, we can calculate that the target value for remediation of petroleum hydrocarbon pollution in the soil of a certain petrochemical site is 2092.55 mg / kg.

[0084] Furthermore, the concentration of petroleum hydrocarbons, the percentage of petroleum hydrocarbon concentration, the petroleum hydrocarbon hazard quotient, the risk control value, and related data of the groundwater samples in the aforementioned petrochemical site are shown in Table 2 below.

[0085] Table 2. Data related to groundwater and petroleum hydrocarbons at a petrochemical site.

[0086]

[0087] Substituting the data in Table 2 above into the above formula (1), we can calculate that the target value for the remediation of petroleum hydrocarbon pollution in the groundwater of a certain petrochemical site is 1.14 mg / L.

[0088] In summary, the method for determining remediation target values ​​for petroleum hydrocarbon pollution in soil and groundwater provided in this application divides aliphatic hydrocarbons and aromatic hydrocarbons into five carbon chain intervals: C6-C9, C10-C12, C13-C16, C17-C21, and C22-C40. Based on these five carbon chain intervals, the petroleum hydrocarbon concentration percentages in soil samples and groundwater samples are determined. Finally, by combining these percentages with the petroleum hydrocarbon hazard quotient and risk control value, the remediation target values ​​for petroleum hydrocarbon pollution in soil samples and groundwater samples are derived. The petroleum hydrocarbon pollution remediation target values ​​derived through this process provide unique remediation target values ​​that reflect the environmental risk of different carbon chain intervals within the total petroleum hydrocarbons. This provides a relatively reliable evaluation standard for the effectiveness of petroleum hydrocarbon pollution remediation, preventing problems such as insufficient or excessive remediation due to unreasonable remediation target settings.

[0089] Furthermore, after remediation based on the petroleum hydrocarbon pollution remediation target values ​​obtained in the embodiments of this application, since the remediation target values ​​integrate the concentrations of petroleum hydrocarbons with various carbon numbers from C6 to C40, only the concentrations of C6-C9 and C10-C40 need to be measured according to national standard methods during remediation acceptance. No additional measurement of other carbon number ranges is required, thus significantly saving testing costs. This not only improves the scientific rigor of remediation target setting but also considers the feasibility and economy of practical operation, providing effective technical support for the precise remediation of petroleum hydrocarbon contaminated sites.

[0090] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for determining a target value for remediation of soil and groundwater petroleum hydrocarbon pollution, characterized in that, The method comprises: collecting an oil hydrocarbon test sample of a target remediation site; the oil hydrocarbon test sample comprises a soil sample and a groundwater sample in the target remediation site; determining the oil hydrocarbon concentration of the soil sample and the oil hydrocarbon concentration of the groundwater sample, respectively; wherein the oil hydrocarbon concentration comprises the oil hydrocarbon concentration in each carbon chain interval of a plurality of carbon chain intervals; the plurality of carbon chain intervals comprises aliphatic hydrocarbon C6-C9, aliphatic hydrocarbon C10-C12, aliphatic hydrocarbon C13-C16, aliphatic hydrocarbon C17-C21, aliphatic hydrocarbon C22-C40, aromatic hydrocarbon C6-C9, aromatic hydrocarbon C10-C12, aromatic hydrocarbon C13-C16, aromatic hydrocarbon C17-C21, and aromatic hydrocarbon C22-C40; calculating the proportion of the oil hydrocarbon concentration of each carbon chain interval in the soil sample and the proportion of the oil hydrocarbon concentration of each carbon chain interval in the groundwater sample by the oil hydrocarbon concentration of the soil sample and the oil hydrocarbon concentration of the groundwater sample, respectively; the proportion of the oil hydrocarbon concentration of each carbon chain interval in the soil sample comprises the ratio of the oil hydrocarbon concentration of each carbon chain interval in the plurality of carbon chain intervals in the soil sample to the total oil hydrocarbon concentration of the soil sample; the proportion of the oil hydrocarbon concentration of each carbon chain interval in the groundwater sample comprises the ratio of the oil hydrocarbon concentration of each carbon chain interval in the plurality of carbon chain intervals in the groundwater sample to the total oil hydrocarbon concentration of the groundwater sample; The petroleum hydrocarbon pollution restoration target value CL of the soil sample is calculated by using the petroleum hydrocarbon concentration proportion in each carbon chain interval, the petroleum hydrocarbon hazard quotient and the risk control value in the soil sample s The petroleum hydrocarbon pollution restoration target value CL of the groundwater sample is calculated by using the petroleum hydrocarbon concentration proportion in each carbon chain interval, the petroleum hydrocarbon hazard quotient and the risk control value in the groundwater sample gw .

2. The method of claim 1, wherein The petroleum hydrocarbon pollution remediation target value CL of the soil sample s satisfies the following equation; The petroleum hydrocarbon pollution remediation target value CL of the groundwater sample gw satisfies the following equation; wherein s represents soil, i represents the i-th carbon chain interval in a plurality of carbon chain intervals, n is the number of the plurality of carbon chain intervals, H s,i represents the petroleum hydrocarbon hazard quotient in the i-th carbon chain interval in the soil sample, ω s,i represents the petroleum hydrocarbon concentration proportion in the i-th carbon chain interval in the soil sample, HCV s,i represents the risk control value of the petroleum hydrocarbon in the i-th carbon chain interval in the soil sample, j represents the j-th carbon chain interval in the plurality of carbon chain intervals, HCV s,j represents the risk control value of the petroleum hydrocarbon in the j-th carbon chain interval in the soil sample, ω s,j represents the petroleum hydrocarbon concentration proportion in the j-th carbon chain interval in the soil sample; gw represents groundwater, HI gw,i represents the petroleum hydrocarbon hazard quotient in the i-th carbon chain interval in the groundwater sample, ω gw,i represents the petroleum hydrocarbon concentration proportion in the i-th carbon chain interval in the groundwater sample, HCV gw,i represents the risk control value of the petroleum hydrocarbon in the i-th carbon chain interval in the groundwater sample, HCV gw,j represents the risk control value of the petroleum hydrocarbon in the j-th carbon chain interval in the groundwater sample, ω gw,j represents the petroleum hydrocarbon concentration proportion in the j-th carbon chain interval in the groundwater sample.

3. The method of claim 1 or 2, wherein, the method further comprises: determining the oil hydrocarbon hazard quotient and risk control value of the soil sample according to the oil hydrocarbon concentration of the soil sample, exposure pathway, and pollution risk assessment algorithm; determining the oil hydrocarbon hazard quotient and risk control value of the groundwater sample according to the oil hydrocarbon concentration of the groundwater sample, exposure pathway, and pollution risk assessment algorithm.

4. The method of claim 3, wherein for the exposure pathway of the soil sample: when the sampling depth of the soil sample is less than or equal to 50 cm, the exposure pathway of the soil sample comprises oral ingestion of soil particles, skin contact with soil particles, inhalation of soil particles, and inhalation of gaseous pollutants from surface soil in outdoor air; when the sampling depth of the soil sample is in the range of 0.5-20 m, the exposure pathway of the soil sample comprises inhalation of gaseous pollutants from lower soil in outdoor air and inhalation of gaseous pollutants from lower soil in indoor air; the exposure pathway of the groundwater sample comprises inhalation of gaseous pollutants from groundwater in outdoor air, inhalation of gaseous pollutants from groundwater in indoor air, and drinking of groundwater.

Images