Method for accounting carbon emission of sponge city LID facility in full life cycle

Abstract

The invention belongs to the technical field of life cycle evaluation, and relates to a method for accounting the whole life cycle carbon emission of sponge city LID facilities. A life cycle evaluation method is used for accounting the carbon emission of sponge city LID facilities in the whole life cycle and the carbon emission of environment-friendly new materials produced by waste and recycled sponge city waste base materials, and the carbon emission reduction of other power generation modes is used, and the system boundary of the sponge city LID facilities in the whole life cycle is firstly determined; then collecting resource and energy consumption data in a raw material production infrastructure construction stage, a transportation stage, a sponge facility operation and maintenance stage and a dismantling and recycling stage in a full life cycle of three LID facilities of the sponge city, and checking carbon emission generated in different stages; then, GaBi software is used for modeling; and finally, carrying out result analysis by using CML2001. Recovery measures for recovering the waste base materials of the sponge city and a carbon emission reduction path of the sponge city can be put forward according to a result calculated by the method disclosed by the invention.

Description

Technical Field

[0001] The present invention belongs to the technical field of life cycle assessment and relates to a method for calculating the carbon emissions of LID facilities in a sponge city over the entire life cycle. Background Art

[0002] As an important public facility, the greenhouse gas emissions and energy consumption of urban rainwater management systems are gradually being taken seriously. Sponge cities are the latest water resource management strategy, which means that cities are like sponges and have good resilience in the face of natural disasters such as environmental changes and rain and floods. The core of sponge cities lies in low-impact development (LID) facilities, which reduce surface runoff, improve water quality, and enhance ecological functions by retaining, infiltrating, and utilizing rainwater. Sponge cities reduce carbon emissions while improving urban safety. Building sponge cities is an effective measure and path to achieve carbon reduction goals. At present, the research on carbon emissions of sponge city LID facilities throughout their life cycle is in the initial stage. The relevant research is in the exploratory stage and is not perfect. There is a lack of specific carbon emission accounting for the recycling and disposal of sponge facilities and methods. Therefore, a more complete, comprehensive and reliable carbon accounting method is needed. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a method for calculating the carbon emissions of sponge city LID facilities over the entire life cycle.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A method for calculating the carbon emissions of a sponge city LID facility over its entire life cycle comprises the following steps:

[0006] (1) Determination of objectives and scope: The entire life cycle of sponge city LID facilities includes the production and construction of infrastructure raw materials, transportation, operation and maintenance, and disposal. The system boundary is defined as the above four stages, and the resources, energy, material inputs and greenhouse gas emissions of each stage within the system boundary are considered, including direct and indirect emissions of each stage. The functional unit is defined as 100m 2 Infrastructure, compare the full life cycle emissions of various sponge city LID facilities, and calculate the carbon emissions from the recycling of waste substrates in sponge cities.

[0007] (2) Inventory analysis: Collect data on material, resource, and energy consumption in the three stages of sponge city infrastructure construction, transportation, operation and maintenance, and waste recycling. The data mainly comes from two sources: one is from information released by relevant management departments, industry feasibility study reports, environmental impact assessment reports and other existing materials and published references; the other is from the life cycle assessment analysis tool GaBiEducation Database and related carbon emission factors.

[0008] (3) Impact assessment method: Based on the inventory data, the three types of sponge city LID facilities were modeled throughout their life cycle using GaBi software and GaBi Database. The carbon emissions of the sponge city LID facilities throughout their life cycle were calculated using CML2001-JAN.2016 for comparison. A scenario of recycling and producing new environmentally friendly materials was set up during the abandonment stage and its carbon emissions were calculated.

[0009] (4) Result analysis: Evaluate the results of carbon emission accounting, analyze the carbon emissions of the four stages of the sponge city LID facilities' entire life cycle, calculate the carbon emissions in the recycling and production of environmentally friendly new materials scenario, analyze the carbon emission sources, and propose corresponding carbon reduction measures.

[0010] Beneficial effects of the present invention:

[0011] The carbon emissions and energy consumption of sponge city LID facilities throughout their life cycle are quantified from a full life cycle perspective, which can provide a more systematic and comprehensive understanding of the specific impact of sponge city construction on the environment and energy. Secondly, the carbon emissions of waste sponge substrate recycling scenarios are considered to provide a reference for the selection of sponge city construction materials and their recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the boundary of the entire life cycle of the sponge city LID facilities;

[0013] Figure 2 Production process flow chart for recycling of waste substrates in sponge cities. Specific implementation plan

[0014] The specific implementation of the present invention is further explained in combination with the technical scheme and the accompanying drawings.

[0015] This implementation case selected a feasibility study report, completion environmental acceptance report and design drawings of a sponge city construction project, some of which were obtained through field research. Sponge city LID facilities refer to low-impact development facilities. This case includes three types: rain gardens, permeable pavements, and grass-planted ditches, which achieve rainwater runoff control and improve landscape quality. The project fully implements the sponge concept, with an annual runoff control rate of 75% and an annual runoff pollutant reduction rate of 60% (measured in suspended solids SS). The rainwater resource utilization rate is 5%. The project constructs approximately 4,300m of permeable pavement. 2 , rain garden about 1000m 2 The data of raw materials and mechanical energy for infrastructure construction come from actual surveys, feasibility studies, and the guidance quota standards for Yueyang sponge city construction projects. Background data such as electricity, diesel, concrete, and water use come from the Gabi database.

[0016] CML2001-JAN.2016 is selected as the evaluation method of this embodiment. The indicator global warming potential (GWP100years) is selected as the research target. 2 Infrastructure is a functional unit. The result is 100m 2 For infrastructure, greenhouse gas emissions from the whole life cycle of permeable pavement are 16320kgCO2eq; greenhouse gas emissions from the whole life cycle of rain garden are 13414kgCO2eq; greenhouse gas emissions from the whole life cycle of grass ditch are 9340kgCO2eq. Among them, the greenhouse gas emissions from the permeable pavement infrastructure construction phase are the largest, at 9840kgCO2eq; the greenhouse gas emissions from the rain garden transportation phase are the largest, at 8122kgCO2eq; and the greenhouse gas emissions from the grass ditch transportation phase are the largest, at 3783kgCO2eq.

[0017] Rainwater gardens, permeable pavements and grass-planted ditches can generate 2.08E+05kg, 9.37E+04kg and 1.42E+05kg of solid waste respectively during the abandonment and demolition stages. Traditional landfill disposal can produce carbon emissions of 1.47E+05kgCO2eq, 6.64E+04kgCO2eq and 1.00E+05kgCO2eq, of which the recyclable solid waste accounts for 80% of the input raw materials.

[0018] 1. For sponge city LID facilities, permeable pavement has the highest carbon emissions in its 30-year life cycle, which is about 616,320.19 kgCO2, of which the largest emission is in the construction stage, accounting for about 60.3% of the entire life cycle, and the transportation stage is about 16%; the carbon emissions of rain gardens in their entire life cycle are 13,413.95 kgCO2, of which the largest emission is in the transportation stage, accounting for about 60.5%, and the production and construction stage accounts for 17.6%. Rain gardens are composed of more raw materials and have a larger transportation volume; grass-planted ditches have similar carbon emission characteristics to rain gardens, with a total life cycle carbon emission of 9,339.59 kgCO2, of which the largest emission is in the transportation stage, accounting for about 40.5%, and the production and construction stage accounts for about 26.2%.

[0019] 2. Recycling of waste substrates in sponge cities: By recycling waste substrates in sponge cities, adding raw materials such as permeable special glue, sand and gravel, pigments, mineral powder, heat transfer oil and lubricating oil, and consuming water, electricity, natural gas and other energy, new environmentally friendly materials for sponge cities can be produced, which meet the requirements of permeability and high strength and are suitable for sponge city construction. Roads paved with this substrate have the characteristics of high permeability, high bearing capacity, high durability, mitigation of urban heat island effect, and high safety. By calculating and recycling 1kg of waste substrates in sponge cities, 6kg of new environmentally friendly materials for sponge cities can be produced, and 23.44kgCO2eq of greenhouse gas emissions will be generated at the same time.

[0020] 3. Carbon emissions are generated by electricity consumption during the construction and demolition phase of sponge facilities. Hydropower, wind power, photovoltaic power and nuclear power are used to replace traditional dynamic power generation. 100m 2 The carbon emission reductions over the entire life cycle of the LID facilities are 378.75kgCO2eq, 376.37kgCO2eq, 356.39kgCO2eq and 380.11kgCO2eq respectively.

[0021] 4. Calculate the carbon emissions during the production and construction stages of EPDM paving, permeable brick paving, grass brick paving, and other permeable paving. The carbon emissions during the infrastructure construction stage are 13153.52697kgCO2eq, 13826.81564kgCO2eq, and 8468.085106kgCO2eq. The carbon emissions during the permeable concrete construction stage are 9840kgCO2eq. Therefore, grass brick permeable paving can be selected to reduce carbon emissions.

[0022] This method calculates the carbon emissions generated by the entire life cycle of sponge city LID facilities and energy and material inputs, and analyzes the carbon emissions of recycling waste substrates in sponge cities to produce environmentally friendly new materials, and makes a comparison, based on which improvement measures can be proposed.

Claims

1. A method for calculating the carbon emissions of LID facilities in a sponge city throughout its life cycle, characterized in that: Here are the steps: (1) Determination of objectives and scope: The entire life cycle of sponge city LID facilities includes the production and construction of infrastructure raw materials, transportation, operation and maintenance, and disposal. The system boundary is defined as the above four stages. The resources, energy, material inputs and greenhouse gas emissions of each stage within the system boundary are considered, including direct and indirect emissions of each stage. The functional unit is defined as 100m 2 Infrastructure, compare the greenhouse gas emissions of various sponge city LID facilities throughout their life cycle, and calculate the carbon emissions from the recycling of waste substrates in sponge cities; (2) Inventory analysis: Collect data on the consumption of materials, resources, and energy in the three stages of sponge city infrastructure, including infrastructure construction, transportation, operation and maintenance, and waste recycling. The data comes from two sources: one is from information released by relevant management departments, industry feasibility study reports, environmental impact assessment reports, relevant technical guidelines and other existing materials and published references; the other is from the life cycle assessment analysis tool GaBi Education Database and related carbon emission factors; (3) Impact assessment method: Based on the inventory data, the GaBi software and GaBi Database were used to model the four stages of the life cycle of three types of sponge city LID facilities, namely infrastructure construction, transportation, operation and maintenance, and demolition. A waste recycling and production stage scenario was established. The CML2001-JAN.2016 was used to calculate the carbon emissions of the same offshore wind and solar project throughout its life cycle for comparison. In the waste stage, a recycling and production of environmentally friendly new materials scenario was set up and its carbon emissions were calculated. (4) Result analysis: Evaluate the results of carbon emission accounting, analyze the carbon emissions of the four stages of the sponge city LID facilities' entire life cycle, calculate the carbon emissions in the recycling and production of environmentally friendly new materials scenario, analyze the carbon emission sources, and propose corresponding carbon reduction measures.

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