Exergy-Based Life Cycle Assessment Model for Evaluating the Environmental Impact of Bridge: Principle and Case Study
Abstract
:1. Introduction
2. Exergy Assessment Model
2.1. Principal Assessment Models for Exergy Assessment
2.1.1. The Environmental Impact of Energy Consumption
- (1)
- Energy consumed in energy production
- (2)
- Energy consumed in energy transportation
2.1.2. The Environmental Impact of Pollutant Discharge
2.1.3. The Environmental Impact of Resource Consumption
2.2. Exergy Assessment Model for Different Bridge Life Cycle Stages
2.2.1. Exergy Assessment Model for Raw Material Production and Processing Stage
2.2.2. Exergy Assessment Model for Construction Stage
2.2.3. Exergy Assessment Model for Operation and Maintenance Stage
2.2.4. Exergy Assessment Model for Waste Demolition Stage
3. Case Study
3.1. The Description of the Case Bridge
3.2. The Exergy Assessment of the Environmental Impact—The Bridge Case
4. Discussion
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Appendix A
Raw Material | Environmental Impact Exergy Value (kJ/kg or kJ/m3) | |||||
---|---|---|---|---|---|---|
Environmental Impact of Energy Consumption | Environmental Impact of Pollutant Discharge | Environmental Impact of Resource Consumption | Total | |||
Climate Warming | Rain Acidification | Particulate Matter Emissions | ||||
Portland cement -42.5 | 6287.20 | 4664.93 | 2138.51 | 2048.38 | 197.44 | 15,336.46 |
Portland cement -52.5 | 6509.76 | 4748.96 | 2217.54 | 2130.27 | 197.44 | 15,803.98 |
Portland cement -62.5 | 6732.32 | 4832.99 | 2296.56 | 2212.17 | 197.44 | 16,271.49 |
Ordinary Portland cement -42.5 | 5307.95 | 4295.19 | 1790.79 | 1688.02 | 197.44 | 13,279.39 |
Ordinary Portland cement -52.5 | 6287.20 | 4664.93 | 2138.51 | 2048.38 | 197.44 | 15,336.46 |
Portland slag cement -32.5 | 3661.02 | 3673.36 | 1205.99 | 1081.97 | 197.44 | 9819.77 |
Portland slag cement -42.5 | 4284.18 | 3908.64 | 1427.27 | 1311.28 | 197.44 | 11,128.82 |
Portland slag cement -52.5 | 5307.95 | 4295.19 | 1790.79 | 1688.02 | 197.44 | 13,279.39 |
Pozzolanic Portland cement -32.5 | 4462.23 | 3975.87 | 1490.49 | 1376.80 | 197.44 | 11,502.83 |
Pozzolanic Portland cement -42.5 | 4818.32 | 4110.32 | 1616.93 | 1507.84 | 197.44 | 12,250.86 |
Pozzolanic Portland cement -52.5 | 5307.95 | 4295.19 | 1790.79 | 1688.02 | 197.44 | 13,279.39 |
Fly ash Portland cement -32.5 | 4462.23 | 3975.87 | 1490.49 | 1376.80 | 197.44 | 11,502.83 |
Fly ash Portland cement -42.5 | 4818.32 | 4110.32 | 1616.93 | 1507.84 | 197.44 | 12,250.86 |
Fly ash Portland cement -52.5 | 5307.95 | 4295.19 | 1790.79 | 1688.02 | 197.44 | 13,279.39 |
Composite Portland cement -42.5 | 4640.28 | 4043.09 | 1553.71 | 1442.32 | 197.44 | 11,876.84 |
Composite Portland cement -52.5 | 5307.95 | 4295.19 | 1790.79 | 1688.02 | 197.44 | 13,279.39 |
Asphalt | 45,257.76 | —— | —— | —— | —— | 45,257.76 |
Asphalt concrete | 5014.62 | 288.53 | 23 | 9.89 | 77.98 | 5414.02 |
Concrete C20 | 2616.84 | 1456.04 | 621.05 | 593.84 | 124.84 | 5412.61 |
Concrete C25 | 2942.52 | 1709.52 | 738.6 | 706.46 | 134.44 | 6231.54 |
Concrete C30 | 3152.52 | 1871.19 | 813.4 | 778.13 | 140.74 | 6755.98 |
Concrete C35 | 3453.00 | 2102.21 | 920.27 | 880.51 | 149.78 | 7505.77 |
Concrete C40 | 3631.42 | 2240.58 | 984.38 | 941.94 | 155.06 | 7953.38 |
Concrete C45 | 3749.66 | 2332.72 | 1027.13 | 982.9 | 158.53 | 8250.94 |
Concrete C50 | 3928.08 | 2471.09 | 1091.24 | 1044.33 | 163.82 | 8698.56 |
Rebar | 21,548.72 | 9638.69 | 6040.93 | 4368.38 | 698.25 | 42,294.97 |
Steel plate | 21,872.47 | 9806.35 | 6137.44 | 4434.14 | 698.25 | 42,948.64 |
Steel pipe | 22,994.61 | 10,387.47 | 6471.94 | 4662.07 | 698.25 | 45,214.33 |
Steel strand | 21,578.32 | 9654.01 | 6049.75 | 4374.39 | 698.25 | 42,354.73 |
Rubber and plastic products | 17,391.82 | 6401.82 | 2996.87 | 7952.21 | 0.26 | 34,742.99 |
Coating | 11,992.92 | 4389.99 | 2032.50 | 5228.90 | 0.17 | 23,644.47 |
Item | Gasoline Car | Diesel Car | Fuel Vehicle | |
---|---|---|---|---|
Proportion | 90% | 10% | 100% | |
Fuel consumption (kg/km) | 0.0734 | 0.0847 | 0.0745 | |
Environmental impact of energy consumption (kJ/km) | 3781.90 | 4325.24 | 3836.23 | |
Environmental impact of pollutant discharge (kJ/km) | Climate warming | 1167.16 | 1309.89 | 1181.43 |
Rain acidification | 140.57 | 93.54 | 135.87 | |
Particulate matter emissions | 18.89 | 21.80 | 19.18 | |
Environmental impact of resource consumption (kJ/km) | 0 | 0 | 0 | |
Total (kJ/km) | 5108.52 | 5750.48 | 5172.72 |
Type | Percentage | Environmental Impact Exergy Value (kJ/(vehicle/km)) | |||||
---|---|---|---|---|---|---|---|
Environmental Impact of Energy Consumption | Environmental Impact of Pollutant Discharge | Environmental Impact of Resource Consumption | Total | ||||
Climate Warming | Rain Acidification | Particulate Matter Emissions | |||||
Fuel vehicle | 97% | 3836.23 | 1181.43 | 135.87 | 19.18 | 0 | 5172.72 |
Gas vehicle | 2% | 4026.81 | 840.35 | 15.99 | 0.09 | 0 | 4883.24 |
Electric vehicle | 1% | 1397.00 | 525.21 | 223.20 | 726.84 | 0 | 2872.25 |
Total | 100% | 3815.65 | 1168.05 | 134.35 | 25.88 | 0 | 5143.92 |
Type of Energy | Energy Exergy Value (kJ/kg) | Type of Energy | Energy Exergy Value (kJ/kg) |
---|---|---|---|
Raw coal | 21,966 | kerosene | 44,119 |
Coke | 29,874 | diesel | 43,691 |
Standard coal | 30,769 | gasoline | 44,119 |
Crude oil | 42,834 | LPG | 52,437 |
Fuel oil | 42,834 | nuclear power generation | 3600 |
Gas (ρ = 0.84 kg/m3) | 21,148 | natural gas (ρ = 0.72 kg/m3) | 56,536 |
Hydro, wind, and solar power generation | 3600 | electricity | 8728 (kJ/kWh) |
Exergy Consumption Type | Substance | |||
---|---|---|---|---|
CO2 | SO2 | NOX | PM | |
Exergy consumption of abatement cost (kJ/kg) | 4400 | 17,500 | 26,000 | 500 |
Exergy consumption of thermogeological cost (kJ/kg) | — | 97,820 | 71,880 | 53,420 |
Total exergy consumption (kJ/kg) | 4400 | 115,320 | 97,880 | 53,920 |
Raw material | Type | Consumption (kg/kg) | Transportation Method | Average Transportation Distance (km) | Energy Consumption | |
Diesel (kg/kg) | Electricity (kWh/kg) | |||||
Limestone | 1.099 | 8% railway, 14% waterway, 78% road | railway: 731, waterway: 1477, road: 181 | 0.00766 | 0.00050 | |
Sandstone | 0.112 | 0.00078 | 0.00005 | |||
Clay | 0.091 | 0.00063 | 0.00004 | |||
Dihydrate Gypsum | 0.05 | 0.00035 | 0.00002 | |||
Steel slag | 0.078 | 100% road | road: 50 | 0.00014 | 0.00000 | |
Production process | Energy Consumption | Emission Coefficients of Non-Energy-Consuming Pollutants (kg/kg) | ||||
Electricity (kWh/kg) | Coal (kg/kg) | CO2 | SO2 | NOx | PM | |
0.0855 | 0.1512 | 0.532 | 0.00016 | 0.00175 | 0.00077 | |
Cement transportation | Transportation Method | Average Transportation Distance (km) [40] | Energy Consumption | |||
Electricity (kWh/kg) | Diesel (kg/kg) | |||||
8% railway, 14% waterway, 78% road | 300 | 0.00019 | 0.00903 |
Process | Environmental Impact Exergy Value of Energy Consumption (kJ/kg) | |||||
Diesel | Electricity | Coal | Total | |||
Raw material transportation | 488.61 | 5.72 | — | 494.33 | ||
Production process | — | 791.02 | 3626.62 | 4417.63 | ||
Cement transportation | 394.35 | 1.64 | — | 395.99 | ||
Process | Environmental Impact Exergy Value of Pollutant Discharge (kJ/kg) | |||||
CO2 | SO2 | NOX | PM | Total | ||
Raw material transportation | 150.13 | 0.8 | 10.68 | 5.44 | 167.05 | |
Production process | Energy utilisation part | 1664.02 | 1399.54 | 180.54 | 1637.89 | 4881.99 |
Non-energy-consuming part | 2340.8 | 18.22 | 170.76 | 41.46 | 2571.24 | |
Total | 4004.82 | 1417.76 | 351.3 | 1679.35 | 7453.23 | |
Cement transportation | 140.24 | 0.26 | 9.99 | 3.23 | 153.71 | |
Process | Environmental Impact Exergy Value of Resource Consumption (kJ/kg) | |||||
Production process | 197.44 |
Stage | Item | Quantities | Unit |
---|---|---|---|
Raw material production and processing | cement | 0 | t |
asphalt | 167 | t | |
C20 | 210.5 | m3 | |
C25 | 0 | m3 | |
C30 | 5078.4 | m3 | |
C35 | 3465.1 | m3 | |
C40 | 1310.4 | m3 | |
C45 | 0 | m3 | |
C50 | 5295.2 | m3 | |
rebar | 2023.1 | t | |
steel plate | 1.75 | t | |
steel pipe | 13.76 | t | |
steel strand | 204.6 | t | |
PVC | 0.295 | t | |
coating | 0.6805 | t | |
Construction | gasoline | 2272.752 | kg |
diesel | 67,052.131 | kg | |
electricity | 1,389,781 | kWh | |
Operation and maintenance | gasoline | 10,255 | kg |
diesel | 54,514.815 | kg | |
electricity | 33,047.2 | kWh | |
asphalt | 417.5 | t | |
the bypassing of motor vehicles | 720,000 | vehicle/km | |
Waste demolition | gasoline | 2627.82 | kg |
diesel | 15341 | kg | |
electricity | 840.42 | kWh |
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Coal (kg) | Coke (kg) | Crude Oil (kg) | Gasoline (kg) | Kerosene (kg) | Diesel (kg) | Fuel Oil (kg) | Natural Gas (m3) | Electricity (kWh) |
---|---|---|---|---|---|---|---|---|
66.449 | 0.581 | 0.000 | 0.021 | 0.002 | 0.446 | 0.001 | 0.577 | 25.237 |
Energy Type | Energy Exergy Value [29] (kJ/kg) | Energy Consumption Exergy Value during Energy Production, Processing, and Transportation (kJ/kg) | Embodied Coefficient | |||
---|---|---|---|---|---|---|
Mining | Processing and Production | Transportation | Total | |||
Raw coal | 21,966 | 1729.96 | 0.00 | 289.59 | 2019.55 | 1.09 |
Coke | 29,874 | 1729.96 | 2171.84 | 289.59 | 4191.39 | 1.14 |
Crude oil | 42,834 | 4032.40 | 3114.01 | 165.70 | 7312.11 | 1.17 |
Fuel oil | 42,834 | 4032.40 | 3114.01 | 165.70 | 7312.11 | 1.17 |
Gasoline | 44,119 | 4032.40 | 3207.43 | 165.70 | 7405.53 | 1.17 |
Kerosene | 44,119 | 4032.40 | 3207.43 | 165.70 | 7405.53 | 1.17 |
Diesel | 43,691 | 4032.40 | 3176.32 | 165.70 | 7374.42 | 1.17 |
Natural gas | 56,536 | 5322.22 | 0.00 | 669.86 | 5992.08 | 1.11 |
Electricity | 8728 | —— | 1.06 |
Energy Type | Climate Warming (kJ/kg) | Rain Acidification (kJ/kg) | Particulate Matter Emissions (kJ/kg) | Environmental Impact Exergy Value of Pollutant Emissions (kJ/kg) | ||
---|---|---|---|---|---|---|
CO2 | SO2 | NOx | Subtotal | PM | ||
Raw coal | 9038.59 | 8547.52 | 1066.89 | 9614.41 | 8110.65 | 26,764 |
Coke | 14,140.18 | 8939.61 | 1004.25 | 9943.86 | 491.75 | 24,576 |
Crude oil | 16,438.00 | 4317.58 | 572.60 | 4890.18 | 257.39 | 21,586 |
Fuel oil | 16,050.62 | 1349.24 | 668.79 | 2018.04 | 257.39 | 18,326 |
Gasoline | 15,901.30 | 2.70 | 1912.48 | 1915.18 | 257.39 | 18,074 |
Kerosene | 17,233.58 | 94.45 | 854.32 | 948.76 | 257.39 | 18,440 |
Diesel | 15,465.11 | 2.70 | 1101.68 | 1104.38 | 257.39 | 16,827 |
Natural gas | 13,048.93 | 21.76 | 226.53 | 248.29 | 1.44 | 13,299 |
Electricity | 3478.19 | 1253.22 | 224.91 | 1478.13 | 4813.54 | 9796.86 |
Resource Type | Environmental Impact Exergy Value of Resource Consumption (kJ/kg) | Resource Type | Environmental Impact Exergy Value of Resource Consumption (kJ/kg) |
---|---|---|---|
Manganese ore | 94 | Bauxite ore | 300 |
Limestone | 163 | Dolomite | 113 |
Gypsum | 141 | Fluorite | 307 |
Magnetite | 460 | Sandstone | 33 |
Tin | 465 | Iron powder | 6800 |
Sodium carbonate | 297 | Crushed stone (silica) | 37 |
Feldspar | 52 | Clay (kaolinite) | 83 |
Environmental Impact Type | Environmental Impact Exergy Value (kJ/kg) | Percentage | |
---|---|---|---|
Environmental Impact of Energy Consumption | 5307.95 | 39.97% | |
Environmental impact of pollutant discharge | Climate warming | 4295.19 | 32.34% |
Acidification | 1790.79 | 13.49% | |
Particulate matter emissions | 1688.02 | 12.71% | |
Environmental impact of resource consumption | 197.44 | 1.49% | |
Total | 13,279.39 | 100% |
Stage | MPP-Stage | CON-Stage | OM-Stage | WD-Stage | ||
---|---|---|---|---|---|---|
Environmental impact exergy value (TJ) | Environmental impact of energy consumption | 110 | 16.4 | 25.4 | 0.927 | |
Environmental impact of pollutant discharge | Climate warming | 54.8 | 5.91 | 1.96 | 0.282 | |
Rain acidification | 28.1 | 2.13 | 0.225 | 0.0232 | ||
Particulate matter emissions | 23.7 | 6.71 | 0.194 | 0.00867 | ||
Environmental impact of resource consumption | 3.90 | 0 | 0 | 0 | ||
Total | 220 | 31.1 | 27.6 | 1.24 |
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Ma, M.; Li, Z.; Xue, K.; Liu, M. Exergy-Based Life Cycle Assessment Model for Evaluating the Environmental Impact of Bridge: Principle and Case Study. Sustainability 2021, 13, 11804. https://doi.org/10.3390/su132111804
Ma M, Li Z, Xue K, Liu M. Exergy-Based Life Cycle Assessment Model for Evaluating the Environmental Impact of Bridge: Principle and Case Study. Sustainability. 2021; 13(21):11804. https://doi.org/10.3390/su132111804
Chicago/Turabian StyleMa, Mingjun, Ziqiao Li, Kai Xue, and Meng Liu. 2021. "Exergy-Based Life Cycle Assessment Model for Evaluating the Environmental Impact of Bridge: Principle and Case Study" Sustainability 13, no. 21: 11804. https://doi.org/10.3390/su132111804