Quantitative evaluation method of dust pollution sources in construction

Abstract

The present invention provides a quantitative evaluation method for construction dust pollution sources, comprising the following steps: S1, determining the definition of dust pollution sources; S2, constructing a calculation method for a dust propagation attenuation model; S3, screening the types of dust attenuation parameters; S4, conducting multiple experiments through actual detection to determine the calculation formula and coefficient of each dust attenuation parameter in formula (1); S5, transforming the dust attenuation parameters, and verifying formula (2) by comparing the actual TSP mass concentration with the calculated TSP mass concentration; S6, based on the calculation result of formula (2), evaluating in two situations. The present invention combines a variety of parameters that affect dust attenuation to construct a model of dust pollution propagation, can quickly evaluate the category of dust pollution sources, has high calculation accuracy, provides technical support for the evaluation of dust pollution source categories, and is particularly significant for predicting and avoiding dust pollution at construction sites.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection and relates to a quantitative evaluation method for construction dust pollution sources. Background Art

[0002] At present, the environmental impact assessment methods mentioned in the dust environmental impact assessment standards have problems such as complex operation, incomplete definition of dust pollution sources, unreasonable selection of dust impact parameters, great difficulty in calculation, small scope of application, and calculation results that cannot directly reflect the types of dust pollution sources. In particular, they are extremely inapplicable to the calculation of dust attenuation models generated by the internal energy of earthwork operations, thus increasing the workload of on-site management personnel. Therefore, it is necessary to construct an attenuation model of dust pollution sources by screening environmental parameters that have a greater impact on dust attenuation according to the actual working conditions of the construction site, and then establish an intuitive evaluation method. Summary of the invention

[0003] The purpose of the present invention is to provide a quantitative evaluation method for construction dust pollution sources, which combines a variety of parameters that affect dust attenuation to construct a model of dust pollution propagation, can quickly evaluate the categories of dust pollution sources, has high calculation accuracy, and provides technical support for the evaluation of dust pollution source categories. It is particularly helpful for predicting and avoiding dust pollution in construction sites, and reduces the workload of construction site managers.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is to adopt a quantitative evaluation method for construction dust pollution sources, which includes the following steps:

[0005] S1. Determine the definition of dust pollution sources: All operations that generate dust from earthwork operations are considered dust pollution sources;

[0006] S2. The calculation method for constructing the dust propagation attenuation model is:

[0007] C TSP =C 0 ×f(A 1 ,A 2 ,...,A n ) (1)

[0008] Among them, C TSP is the TSP mass concentration at any point around the dust pollution source, A 1 , A 2 , ..., A n is the dust attenuation parameter, C 0 is the TSP mass concentration at 0 m from the noise and dust pollution source, R 2 Set to 0.94;

[0009] S3. Screening the types of dust attenuation parameters;

[0010] S4. Conduct multiple experiments through actual detection to determine the calculation formula and coefficient of each dust attenuation parameter in formula (1). The specific experimental method is to continuously adjust the value of one of the dust attenuation parameters while fixing the values ​​of other dust attenuation parameters to determine the law of the influence of each dust attenuation parameter on dust attenuation; substitute the calculation formula and coefficient into formula (1) to obtain formula (2); S5. Transform the dust attenuation parameters and verify formula (2) by comparing the actual TSP mass concentration with the calculated TSP mass concentration; S6. Based on the calculation results of formula (2), evaluate in two situations:

[0011] Scenario 1: For construction sites in the Class I functional area of ​​ambient air quality, the mass concentration value of TSP at the construction red line boundary is <120μg / m3; or for construction sites in the Class II functional area of ​​ambient air quality, the mass concentration value of TSP at the construction red line boundary is <300μg / m3, then all dust pollution sources at the construction site are determined to be Class II pollution sources;

[0012] Case 2: For construction sites in Category I functional zones of ambient air quality, the TSP concentration value at the construction red line boundary is ≥120μg / m3; or for construction sites in Category II functional zones of ambient air quality, the TSP mass concentration value at the construction red line boundary is ≥300μg / m3, and the ratio analysis method is used for judgment.

[0013] As a preferred technical solution of the present invention, the dust attenuation parameters include dust propagation distance, wind speed, angle between the line connecting the dust pollution source and the upper edge of the barrier and the horizontal plane, and air humidity.

[0014] As a preferred technical solution of the present invention, the formula (2) in step S4 is:

[0015]

[0016] Among them, C TSP is the TSP mass concentration at any point around the dust pollution source, x is the dust propagation distance, ranging from 1 to 200 m, α is the slope angle, ranging from 0 to 60°, V wind is the wind speed, β is the angle between the wind direction and the dust propagation direction, C 0 is the TSP mass concentration at 0m from the noise and dust pollution source, w is the air humidity, R 2 Set to 0.94.

[0017] As a preferred technical solution of the present invention, the specific method of evaluating the dust pollution source category by the ratio analysis method in the case 2 of step S6 is: the TSP concentration value C at the construction red line boundary closest to the diffusion distance of each dust pollution source is TSPThe TSP mass concentration limit C of the corresponding ambient air quality functional area lim The ratio of is determined as follows:

[0018]

[0019] Among them, η is the dust pollution source level, C TSP Calculated by formula (2), C lim Determined according to situation 1 and situation 2; when η≥1, it is determined to be a Class I dust pollution source, and when η<1, it is determined to be a Class II dust pollution source.

[0020] Beneficial effects: The present invention combines multiple parameters that affect dust attenuation to construct a model of dust pollution propagation, which can quickly evaluate the categories of dust pollution sources with high calculation accuracy, providing technical support for the evaluation of dust pollution source categories, especially for the prediction and avoidance of dust pollution in construction sites. The constructed dust pollution propagation model is obtained by comparing measured values ​​with multiple function laws including Gaussian function, power function, and exponential law, and is consistent with the actual data of the construction site. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application are described clearly and completely below. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0022] A quantitative evaluation method for construction dust pollution sources, the method comprising the following steps:

[0023] S1. Determine the definition of dust pollution sources: All operations that generate dust from earthwork operations are considered dust pollution sources;

[0024] S2. The calculation method for constructing the dust propagation attenuation model is:

[0025] C TSP =C 0 ×f(A 1 ,A 2 ,...,A n ) (1)

[0026] Among them, C TSP is the TSP mass concentration at any point around the dust pollution source, A 1 , A 2 , ..., A n is the dust attenuation parameter, C 0is the TSP mass concentration at 0 m from the noise and dust pollution source, R 2 Set to 0.94;

[0027] S3. Screen the types of dust attenuation parameters, which include dust propagation distance, wind speed, angle between the line connecting the dust pollution source and the upper edge of the barrier and the horizontal plane, and air humidity;

[0028] S4. Conduct multiple experiments through actual detection to determine the calculation formula and coefficient of each dust attenuation parameter in formula (1). The specific experimental method is to continuously adjust the value of one of the dust attenuation parameters while fixing the values ​​of other dust attenuation parameters to determine the law of the influence of each dust attenuation parameter on dust attenuation; substitute the calculation formula and coefficient into formula (1) to obtain formula (2):

[0029]

[0030] Among them, C TSP is the TSP mass concentration at any point around the dust pollution source, x is the dust propagation distance, ranging from 1 to 200 m, α is the slope angle, ranging from 0 to 60°, V wind is the wind speed, β is the angle between the wind direction and the dust propagation direction, C 0 is the TSP mass concentration at 0m from the noise and dust pollution source, w is the air humidity, R 2 Set to 0.94.

[0031] S5, changing the dust attenuation parameters, and verifying formula (2) by comparing the actual TSP mass concentration with the calculated TSP mass concentration;

[0032] S6. Based on the calculation results of formula (2), two situations are evaluated:

[0033] Scenario 1: For construction sites in the Class I functional area of ​​ambient air quality, the mass concentration value of TSP at the construction red line boundary is <120μg / m3; or for construction sites in the Class II functional area of ​​ambient air quality, the mass concentration value of TSP at the construction red line boundary is <300μg / m3, then all dust pollution sources at the construction site are determined to be Class II pollution sources;

[0034] Case 2: For construction sites in the first-class functional zone of ambient air quality, the TSP concentration value at the construction red line boundary is ≥120μg / m3; or for construction sites in the second-class functional zone of ambient air quality, the TSP mass concentration value at the construction red line boundary is ≥300μg / m3. The ratio analysis method is used for judgment. The specific method of evaluating the dust pollution source category by the ratio analysis method is: the TSP concentration value C at the construction red line boundary closest to the diffusion distance of each dust pollution source is used for judgment. TSP The TSP mass concentration limit C of the corresponding ambient air quality functional arealim The ratio of is determined as follows:

[0035]

[0036] Among them, η is the category of dust pollution source, C TSP Calculated by formula (2), C lim Determined according to situation 1 and situation 2; when η≥1, it is determined to be a Class I dust pollution source, and when η<1, it is determined to be a Class II dust pollution source.

[0037] For Class I pollution sources with an evaluation value > 1, engineering technical measures need to be adopted to manage the pollution sources, such as dust covers, barriers, sprinklers and other engineering measures; for Class II pollution sources with an evaluation value < 1, only management technical measures need to be adopted to manage the pollution sources, such as operation time management, operation cycle management, etc.

[0038] When calculating according to formula (2), if the calculated value is less than or equal to the real-time value of the meteorological department, no measures need to be taken.

[0039] Although this specification has shown and described a plurality of embodiments of the present invention, it is obvious to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will think of many changes, modifications and alternatives without departing from the thought and spirit of the present invention. It should be understood that in the process of practicing the present invention, various alternatives to the embodiments of the present invention described herein may be adopted. The attached claims are intended to define the scope of protection of the present invention, and therefore cover the modular composition, equivalent or alternatives within the scope of protection of these claims.

Claims

1. A quantitative evaluation method for construction dust pollution sources, characterized in that: The following steps are involved: S1. Determine the definition of dust pollution sources: All operations that generate dust from earthwork operations are considered dust pollution sources; S2. The calculation method for constructing the dust propagation attenuation model is: <h2 style=";text-align:left;direction:ltr">C<h2 style=";text-align:left;direction:ltr"> TSP <h2 style=";text-align:left;direction:ltr"> =C0×f(A1,A2,...,A<h2 style=";text-align:left;direction:ltr"> n <h2 style=";text-align:left;direction:ltr"> ) (1) Among them, C TSP is the TSP mass concentration at any point around the dust pollution source, A1, A2, ..., A n is the dust attenuation parameter, C0 is the TSP mass concentration at 0m from the noise dust pollution source, R 2 Set to 0.94; S3. Screening the types of dust attenuation parameters; S4. Conduct multiple experiments through actual detection to determine the calculation formula and coefficient of each dust attenuation parameter in formula (1). The specific experimental method is to continuously adjust the value of one of the dust attenuation parameters while fixing the values ​​of other dust attenuation parameters to determine the law of the influence of each dust attenuation parameter on dust attenuation; substitute the calculation formula and coefficient into formula (1) to obtain formula (2); S5, changing the dust attenuation parameters, and verifying formula (2) by comparing the actual TSP mass concentration with the calculated TSP mass concentration; S6. Based on the calculation results of formula (2), two situations are evaluated: Case 1: A construction site in a Class I functional area of ​​ambient air quality, where the mass concentration of TSP at the construction red line boundary is <120 μg / m 3 ; or construction sites in the second-class functional area of ​​ambient air quality, the mass concentration of TSP at the construction red line boundary is less than 300μg / m 3 , then all dust pollution sources of the construction site are determined to be Class II pollution sources; Case 2: Construction sites in the Class I functional area of ​​ambient air quality, where the TSP concentration at the construction red line boundary is ≥ 120 μg / m 3 ; or construction sites in the second-class functional area of ​​ambient air quality, the TSP mass concentration value at the construction red line boundary is ≥300μg / m 3 , using ratio analysis method to make judgment; The dust attenuation parameters include dust propagation distance, wind speed, angle between the line connecting the dust pollution source and the upper edge of the barrier and the horizontal plane, and air humidity; The formula (2) in step S4 is: Among them, C TSP is the TSP mass concentration at any point around the dust pollution source, x is the dust propagation distance, ranging from 1 to 200 m, α is the slope angle, ranging from 0 to 60°, V wind is the wind speed, β is the angle between the wind direction and the dust propagation direction, C0 is the TSP mass concentration at 0m from the noise and dust pollution source, w is the air humidity, R 2 Set to 0.

94.

2. The quantitative evaluation method for construction dust pollution sources according to any one of claim 1, characterized in that: The specific method of evaluating the dust pollution source category by the ratio analysis method in the case 2 of step S6 is: the TSP concentration value C at the construction red line boundary closest to the diffusion distance of each dust pollution source is TSP The TSP mass concentration limit C of the corresponding ambient air quality functional area lim The ratio of is determined as follows: Among them, η is the category of dust pollution source, C TSP Calculated by formula (2), C lim Determined according to situation 1 and situation 2; when η≥1, it is determined to be a Class I dust pollution source, and when η<1, it is determined to be a Class II dust pollution source.

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