Comprehensive evaluation method for carbon emission level of site pollution remediation technology coupled with environmental economic impact analysis

Abstract

The invention provides a site pollution remediation technology carbon emission level comprehensive evaluation method coupled with environmental economic impact analysis. The method comprises five links of evaluation boundary determination, carbon emission accounting, environmental impact analysis, remediation cost measurement and calculation, expert score evaluation and the like. The carbon emission accounting adopts an IPCC emission factor method, the environmental influence analysis adopts an LCA ReCiPe 2016 method, and the repair cost calculation comprises construction cost accounting and carbon emission cost accounting. According to the technical scheme, on the basis of calculating the carbon emission of the restoration activity, the restoration efficiency, the restoration cost and the overall environmental impact analysis are introduced, the carbon emission level comprehensive evaluation method which gives consideration to carbon reduction, decontamination, greenness and economy is formed, and the practical guidance effect of the evaluation result is improved. The method can be used for comparing the carbon emission levels of different site pollution remediation technologies, can also be used for evaluating and comparing the carbon emission levels of different construction schemes of the same remediation technology, provides reference for remediation decision making, and has good application prospects.

Description

Technical Field

[0001] The present invention belongs to the field of soil pollution remediation, and specifically relates to a comprehensive evaluation method for carbon emission levels of site pollution remediation technology coupled with environmental and economic impact analysis. Background Art

[0002] At present, the mainstream carbon emission accounting methods at home and abroad include the IPCC emission factor method, the LCA life cycle assessment method, etc. These methods calculate the carbon dioxide emission equivalent based on the material input list of the entire remediation process, and provide data support for mastering the total carbon emissions and their distribution characteristics of different cases. Relying on the existing accounting methods, practitioners have further proposed carbon emission assessment models and implementation methods suitable for different spatial scales, different industries, and different processes, and developed a series of supporting monitoring devices and software tools. Existing research results, such as CN 202111482701.X, CN202311221878.3, CN 202410329091.7, etc., provide strong support for analyzing the current status of carbon emissions in various industries and identifying and optimizing carbon emission sources.

[0003] In the field of site pollution control, domestic scholars have successively carried out research on the carbon emission characteristics of various soil pollution remediation technologies and their monitoring and evaluation technologies in recent years. CN 202310588130.0 discloses a carbon accounting and carbon neutrality evaluation method and system for the green ecological restoration technology industry chain, and defines the carbon footprint analysis process of plant restoration and ecological material application; CN 202310791949.7 proposes a calculation method for the carbon footprint of the ex situ remediation project of the contaminated site and a carbon emission reduction method. However, the existing research results provide carbon emission values ​​for technical cases, and the data cannot reflect the differences in remediation efficiency between different cases; and the global warming effect caused by carbon emissions is only part of the environmental impact of the remediation activities. The evaluation and optimization of the carbon emission level of the remediation technology should take into account the various environmental damages and economic impacts it produces. However, the existing carbon emission evaluation methods cannot meet the above evaluation needs, and it is necessary to develop a multi-dimensional comprehensive evaluation method to help achieve efficient and low-carbon remediation of contaminated sites. Summary of the invention

[0004] In response to the above-mentioned deficiencies, this patent proposes a comprehensive evaluation method for carbon emission levels of site pollution remediation technologies coupled with environmental and economic impact analysis.

[0005] The technical solution of this invention patent is:

[0006] A method for evaluating the carbon emission level of site pollution remediation technology coupled with environmental and economic impact analysis is characterized in that the evaluation method includes five steps: assessment boundary determination, carbon emission accounting, environmental impact analysis, remediation cost estimation, and expert scoring evaluation.

[0007] Specifically, the content of the assessment boundary determination phase includes determining the evaluation object, analyzing the restoration process, and clarifying the accounting scope of carbon emissions, environmental impacts and costs. The content of the carbon emission accounting phase includes establishing a carbon emission accounting model, finding carbon emission factors, and calculating the restoration carbon emissions. The content of the environmental impact analysis phase includes establishing a full life cycle environmental impact assessment model, calculating the midpoint environmental impact and endpoint environmental impact data, and calculating the total environmental impact score. The content of the restoration cost calculation phase includes calculating the construction cost, calculating the carbon emission cost, and calculating the total restoration cost. The content of the expert scoring evaluation phase includes consulting experts to assign points, grading carbon emission levels, and forming an assessment report.

[0008] The site pollution remediation technology includes soil pollution remediation technology and groundwater pollution remediation technology; the site pollution includes heavy metal pollution, organic pollution and heavy metal-organic composite pollution.

[0009] The carbon emission accounting adopts the IPCC emission factor method. The restoration carbon emission is the sum of the carbon emissions generated by material and energy input. The formula is: In the formula, C is the carbon emission of restoration; i Factor: The amount of material or energy consumed in the process of remediating each cubic meter of contaminated soil or groundwater; i is the carbon emission factor of the corresponding material or energy.

[0010] The unit of the above restoration carbon emissions is t CO2eq / m 3 , can also be converted to kg according to demand CO2eq / kg pollutant.

[0011] The environmental impact analysis adopts the LCA ReCiPe 2016 method.

[0012] The midpoint environmental impact data include 18 indicators, including terrestrial acidification, global warming, freshwater ecotoxicity, marine ecotoxicity, terrestrial ecotoxicity, fossil fuel scarcity, freshwater eutrophication, marine eutrophication, human toxicity (carcinogenic), human toxicity (non-carcinogenic), ionizing radiation, land resource consumption, mineral resource scarcity, ozone layer depletion, inhalable particulate matter, photochemical oxide formation (human), water resource consumption, photochemical oxide formation (environment). The calculation of the midpoint impact index value is shown in the following formula: In the formula, LCA M is the midpoint impact value; CF c,mis the material characterization impact factor (from the Ecoinvent database ReCiPe 2016, midpoint (H)); LCI m is the inventory data of the corresponding substance; c is the substance type; m is the impact category.

[0013] The endpoint environmental impact data include three indicators, namely human health, ecosystem, and resource consumption, and include a total of 22 types of environmental damage, which are calculated and assigned values ​​through the midpoint environmental impact data. The environmental damage types are: global warming-human health, ozone layer depletion-human health, ionizing radiation-human health, inhalable particulate matter-human health, photochemical oxide formation (human)-human health, human toxicity (carcinogenic)-human health, human toxicity (non-carcinogenic)-human health, water resource consumption-human health, global warming-ecosystem (terrestrial), photochemical oxide formation (environment)-ecosystem (terrestrial), terrestrial acidification-ecosystem (terrestrial), terrestrial ecotoxicity-ecosystem (terrestrial), water resource consumption-ecosystem (terrestrial), land resource consumption-ecosystem (terrestrial), global warming-ecosystem (freshwater), freshwater eutrophication-ecosystem (freshwater), freshwater ecotoxicity-ecosystem (freshwater), water resource consumption-ecosystem (freshwater), marine ecotoxicity-ecosystem (marine), marine eutrophication-ecosystem (marine), mineral resource shortage-resource consumption, fossil fuel shortage-resource consumption.

[0014] The total environmental impact score is calculated using the endpoint environmental impact data. The calculation formula is: In the formula, F S The final score is LCA Hi is the damage value of each human health endpoint; T Hi Standardized factors for the effects on various human health endpoints; LCA Ej is the endpoint damage value of each ecosystem; T Ej is the normalization factor for the impact on each ecosystem endpoint; LCA Rk T is the damage value of each resource consumption endpoint; Rk is the normalization factor for the impact of each resource consumption endpoint.

[0015] The unit of the above total environmental impact score is kPt / m 3 , and can also be converted to Pt / kg pollutant as needed.

[0016] The restoration cost includes construction cost and carbon emission cost, and the calculation formula is: C total =C e +C c ……Formula 3 Among them, C total , C e , C c respectively represent the repair cost, construction cost and carbon emission cost, with the unit of RMB / m 3 ,, which can also be converted to RMB / kg pollutant according to requirements. The carbon emission cost is measured based on the local carbon trading price.

[0017] The scoring basis for the expert scoring link is as follows: the score for the repaired carbon emissions is 0 - 10 points, and the scores are assigned in reverse numerical order, that is, the higher the carbon emission value, the worse the indicator, and the lower the score; the score for the removal effect is 0 - 4 points, and it decreases with the removal rate from high to low, that is, the higher the removal rate, the higher the score; the scores for environmental impact and repair cost are each 0 - 3 points, and the scores are assigned in reverse numerical order, that is, the higher the value, the worse the indicator, and the lower the score. The total evaluation score is the sum of the scores of the 4 items of removal effect, repaired carbon emissions, environmental impact, and repair cost, with a maximum of 20 points.

[0018] The grading standard for the carbon emission level in the expert scoring link is as follows: take the average value of all expert scoring results as the final score K. When K ≤ 5, the carbon emission level is extremely high; when 5 < K ≤ 10, the carbon emission level is high; when 10 < K ≤ 15, the carbon emission level is medium; when 15 < K ≤ 20, the carbon emission level is low.

[0019] The scoring basis and the grading standard for the carbon emission level can be adjusted according to actual evaluation requirements and expert opinions.

[0020] The technical solution proposed in this patent is different from the traditional carbon emission assessment method. It expands the assessment content from a single carbon emission to a comprehensive evaluation index including removal effect, carbon emission, environmental impact, and repair cost. On the basis of calculating the carbon emission, the carbon emission cost is included in the scope of repair cost calculation, and the decontamination effect and overall environmental impact are investigated. A scoring and evaluation system that focuses on carbon emission and takes into account decontamination, green, and economic requirements is proposed. The implementation of this technical solution will help to more comprehensively evaluate the impact of the carbon emission of the repair technology, enhance the practical guiding role of the carbon emission level assessment results, and provide a theoretical basis for improving the green sustainability of the repair technology and formulating carbon emission reduction strategies.

[0021] The method for evaluating the carbon emission level of the in - situ pollution remediation technology coupling environmental - economic impact analysis proposed in this invention patent can be used to evaluate the carbon emission levels of various in - situ pollution remediation technologies, compare and screen green and low - carbon remediation technologies, and promote the low - carbon development of remediation technologies. This evaluation method can also be used to evaluate and compare the carbon emission levels of different construction schemes of the same technology, assist in determining the optimal combination of low - carbon remediation process parameters, provide reference for remediation decision - making, and has good application prospects. Description of the Drawings

[0022] Figure 1 Flow chart of the evaluation method. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with specific implementation methods to better reflect the advantages of the present invention.

[0024] Example 1 Comprehensive evaluation of carbon emission levels of ex situ leaching remediation technology for contaminated soil on site

[0025] According to decision-making needs, an ex situ leaching remediation project of a Pb-contaminated site was selected as an example to evaluate and compare the carbon emission levels of different ex situ leaching construction schemes, and the evaluation work was carried out based on the technical solution proposed in the patent of this invention.

[0026] (1) Determination of assessment boundaries

[0027] Step a determines the evaluation object: the carbon emission level of different alternative ex situ leaching construction schemes is used as the evaluation object, and further, the carbon emission level of different alternative combinations of ex situ leaching process parameters is used as the evaluation object. The alternative combination of process parameters includes three parameters: eluent concentration, elution time, and liquid-solid ratio. There are 4 groups of alternative combinations of ex situ leaching process parameters, and the corresponding small-scale removal effects are shown in Table 1; the remediation target value of the site is 80%.

[0028] Table 1 Alternative combinations of process parameters

[0029] Step b: Analysis of the remediation process: The ex situ elution remediation process is as follows: excavate the contaminated soil and send it to the elution remediation equipment, use EDTA as the elution agent, and process it through the elution process (slurry elution, vibration screening, solid-liquid separation process). Collect the sieved soil samples for testing and analysis to determine the remediation effect. After screening, the contaminated liquid is added with wastewater treatment agents (PAC, PAM and Na 2 S) and discharged after meeting the standards.

[0030] Step c: Clarify the accounting scope of carbon emissions, environmental impacts and costs: Through analysis, the accounting scope of carbon emissions and environmental impacts in this case includes the production, transportation and use of materials and energy invested in the excavation and transportation stage, leaching and repair stage, wastewater treatment stage, solid waste transportation and disposal stage, and backfill stage, but does not include the construction of the repair greenhouse, the production and transportation of repair equipment and personnel input. The cost accounting scope includes the procurement costs of all materials and energy, as well as carbon emission costs.

[0031] (2) Carbon emissions accounting

[0032] Step a: Establish a carbon emission accounting model: According to the source of carbon emissions, refine the carbon emission accounting method and convert formula 1 into the following formula:

[0033] Carbon emissions from restoration = Carbon emissions from excavation and transportation + Carbon emissions from leaching and restoration + Carbon emissions from wastewater treatment + Carbon emissions from solid waste transportation and disposal + Carbon emissions from backfilling… Formula 4.0

[0034] Carbon emissions during the excavation and transportation phase = Carbon emissions from diesel consumption by construction vehicles... Formula 4.1

[0035] Carbon emissions during the leaching and remediation phase = Carbon emissions from leaching agents + Carbon emissions from water input + Carbon emissions from equipment power input ... Formula 4.2

[0036] Carbon emissions during wastewater treatment = Carbon emissions from wastewater treatment chemicals + Carbon emissions from equipment power input... Formula 4.3

[0037] Carbon emissions from solid waste transportation and disposal = Carbon emissions from diesel consumption by transportation vehicles + Carbon emissions from solid waste disposal... Formula 4.4

[0038] Carbon emissions during the backfilling phase = Carbon emissions from diesel consumption by construction vehicles... Equation 4.5

[0039] Step b: Find carbon emission factors: Find EDTA, diesel, electricity, etc. from the Ecoinvent database, the "Corporate Greenhouse Gas Emissions Accounting and Reporting Guidelines for Power Generation Facilities", the "Notice on Doing a Good Job in the Management of Greenhouse Gas Emission Reporting for Power Generation Industry Enterprises from 2023 to 2025", and the "China Product Life Cycle Greenhouse Gas Emission Coefficient Set (2022)". PAC, PAM and Na 2 Carbon emission factors of S, etc.

[0040] c. Calculate the carbon emissions from restoration: Calculate the carbon emissions from restoration according to the formula. The specific calculation results are shown in Table 2.

[0041] Table 2 Calculation results

[0042] (3) Environmental impact analysis

[0043] Step a: Establish a full life cycle environmental impact assessment model: The specific formula is:

[0044] Environmental impact of the entire life cycle = Environmental impact of the excavation and transportation stage + Environmental impact of the leaching and restoration stage + Environmental impact of the wastewater treatment stage + Environmental impact of the solid waste transportation and disposal stage + Environmental impact of the backfill stage... Formula 5.0

[0045] Environmental impact of excavation and transportation stage = Environmental impact of diesel consumption by construction vehicles... Equation 5.1

[0046] Environmental impact of the leaching and repair stage = Environmental impact of the leaching agent + Environmental impact of water input + Environmental impact of equipment power input ... Formula 5.2

[0047] Environmental impact of wastewater treatment stage = Environmental impact of wastewater treatment chemicals + Environmental impact of equipment power input... Formula 5.3

[0048] Environmental impact of solid waste transportation and disposal = Environmental impact of diesel consumption by transportation vehicles + Environmental impact of solid waste disposal... Formula 5.4

[0049] Carbon emissions during the backfilling phase = Environmental impact of diesel consumption by construction vehicles... Equation 5.5

[0050] Step b: Calculate the midpoint and endpoint environmental impact data: Search for EDTA, diesel, electricity, PAC, PAM and Na from the Ecoinvent database 2 The calculation factors of S, etc. are used to calculate the midpoint environmental impact data according to formula 2.1, and then the end point environmental impact data is calculated.

[0051] Step c: Obtain the total environmental impact score: Based on the above endpoint environmental impact data, calculate the final total environmental impact score according to Formula 2.2. See Table 2 for specific values.

[0052] (4) Repair cost calculation

[0053] Step a: Calculate construction costs: Find EDTA, diesel, electricity, PAC, PAM and Na 2 The transaction price of S, etc. is calculated based on the input cost according to the material consumption, and the construction cost is finally obtained.

[0054] Step b: Calculate the carbon emission cost: Find the local carbon trading price (the case location is 106 RMB / tCO 2 ), calculate the carbon emission cost based on the carbon emission data obtained in (2).

[0055] Step c: Obtain the total cost of restoration: Calculate the total cost by adding up the construction cost and carbon emission cost. See Table 2 for specific values.

[0056] (5) Expert scoring evaluation

[0057] Step a: Consult with experts for scoring

[0058] The above analysis and evaluation data were summarized into a table, and 20 senior experts in the industry were invited to assign scores.

[0059] The basis for score assignment is as follows: the score for carbon emission reduction is 0 - 10 points, assigned in reverse numerical order, that is, the higher the carbon emission value, the worse the indicator and the lower the assigned score; the score for removal efficiency is 0 - 4 points, decreasing with the removal rate from high to low, that is, the higher the removal rate, the higher the score; the scores for environmental impact and restoration cost are each 0 - 3 points, assigned in reverse numerical order, that is, the higher the value, the worse the indicator and the lower the assigned score. The total evaluation score is the sum of the scores for removal efficiency, carbon emission reduction, environmental impact, and restoration cost, with a maximum of 20 points.

[0060] Step b: Classification of carbon emission levels

[0061] 汇总 the score assignment results of 20 senior experts in the industry and take the average as the final score K. According to the classification standard, determine the carbon emission level of each process parameter combination. Among them, if the final score K < 5, the level is extremely high; if 5 < K ≤ 10, the level is high; if 10 < K ≤ 15, the level is medium; if 15 < K ≤ 20, the level is low.

[0062] The comprehensive evaluation results of the carbon emission levels of each process parameter combination are shown in Table 3. Among them, the level of process parameter combination 3 is low, and the final score is significantly lower than other combinations.

[0063] Step c: Generate an evaluation report

[0064] Based on the above analysis results, generate an evaluation report for this case and recommend using process parameter combination 3 as the restoration plan.

[0065] Table 3 Score assignment evaluation results Serial number Final score Carbon emission level evaluation level 1 14.9 middle 2 13.2 middle 3 15.3 Low 4 7.14 high It should be noted that there is an unclear part in the translation of . The Chinese "汇总" is translated as "汇总" in the English version here because it seems to be a special term or placeholder that should be kept as it is according to the requirements. If there is a specific English equivalent for this "汇总" in the context of this patent text, it needs to be adjusted accordingly.

Claims

1. A comprehensive evaluation method for carbon emission levels of site pollution remediation technologies coupled with environmental and economic impact analysis, characterized in that: It includes five links: evaluation boundary determination, carbon emission accounting, environmental impact analysis, remediation cost calculation, and expert scoring evaluation; the evaluation boundary determination link includes determining the evaluation object, analyzing the remediation process flow, and clarifying the accounting scope of carbon emissions, environmental impacts, and costs; the carbon emission accounting link includes establishing a carbon emission accounting model, searching for carbon emission factors, and calculating the carbon emissions of remediation; the environmental impact analysis link includes establishing a life cycle environmental impact assessment model, calculating midpoint and endpoint environmental impact data, and calculating the total environmental impact score; the remediation cost calculation link includes calculating construction costs, calculating carbon emission costs, and calculating the total remediation costs; the expert scoring evaluation link includes consulting experts for scoring, classifying carbon emission levels, and forming an evaluation report.

2. A comprehensive evaluation method for carbon emission levels of site pollution remediation technologies coupled with environmental and economic impact analysis, characterized in that: The carbon emission accounting adopts the IPCC emission factor method, and the formula is: In the formula, C is the carbon emission of restoration; i Factor: The amount of material or energy consumed in the process of remediating each cubic meter of contaminated soil or groundwater; i is the carbon emission factor of the corresponding material or energy.

3. A comprehensive evaluation method for carbon emission levels of site pollution remediation technologies coupled with environmental and economic impact analysis, characterized in that: The environmental impact analysis adopts the LCA ReCiPe 2016 method; the midpoint environmental impact data includes 18 indicators such as terrestrial acidification, global warming, freshwater ecotoxicity, marine ecotoxicity, terrestrial ecotoxicity, fossil fuel scarcity, freshwater eutrophication, marine eutrophication, human toxicity (carcinogenic), human toxicity (non-carcinogenic), ionizing radiation, land resource consumption, mineral resource scarcity, ozone layer depletion, inhalable particulate matter, photochemical oxidant formation (human), water resource consumption, photochemical oxidant formation (environment), etc., and the calculation formula is: In the formula, LCA M is the midpoint impact value; CF c,m is the material characterization impact factor (from the Ecoinvent database ReCiPe2016, midpoint (H)); LCI m is the inventory data of the corresponding substance; c is the substance type; m is the impact category; The endpoint environmental impact data includes 3 indicators such as human health, ecosystem, and resource consumption; the total environmental impact score is obtained by calculating the endpoint environmental impact data, and the calculation formula is: In the formula, F S The final score is LCA Hi is the damage value of each human health endpoint; T Hi Standardized factors for the effects on various human health endpoints; LCA Ej is the endpoint damage value of each ecosystem; T Ej is the normalization factor for the impact on each ecosystem endpoint; LCA Rk T is the damage value of each resource consumption endpoint; Rk is the normalization factor for the impact of each resource consumption endpoint.

4. A comprehensive evaluation method for carbon emission levels of site pollution remediation technology coupled with environmental and economic impact analysis, characterized in that: The remediation cost includes construction costs and carbon emission costs, and the carbon emission costs are calculated based on the local carbon trading price.

5. A comprehensive evaluation method for carbon emission levels of site pollution remediation technology coupled with environmental and economic impact analysis, characterized in that: The scoring basis for the expert scoring link is: the score for the carbon emissions of remediation is 0-10 points, and the scores are assigned in reverse numerical order, that is, the higher the carbon emission value, the worse the indicator, and the lower the score; The score for the removal effect is 0-4 points, and it decreases in reverse order according to the removal rate, that is, the higher the removal rate, the higher the score; the scores for environmental impact and remediation cost are each 0-3 points, and the scores are assigned in reverse numerical order, that is, the higher the value, the worse the indicator, and the lower the score. The total evaluation score is the sum of the scores of the 4 items of removal effect, carbon emissions of remediation, environmental impact, and remediation cost, with a maximum of 20 points.

6. A comprehensive evaluation method for carbon emission levels of site pollution remediation technology coupled with environmental and economic impact analysis, characterized in that: The carbon emission level classification standard for the expert scoring link is: take the average value of all expert scoring results as the final score K, K≤5, the carbon emission level is extremely high; 5<K≤10, the level is high; 10<K≤15, the level is medium; 15<k≤20, the level is low.

Images