Life Cycle Assessment of Nitrogen Circular Economy-Based NOx Treatment Technology
2.1. Research Framework
2.2. Life Cycle Assessment
- For the conversion catalysts, the service life was 2 years.
- A typical transportation distance of 100 km was assumed for materials.
- Generated waste waters were disposed by industrial wastewater treatment services.
- NOx usually consists of 95% NO and 5% NO2. However, NOx was set as 100% NO in this study for simplicity.
- The recycling of consumed materials was not considered.
2.3. Scenario Modeling of ReNOx Technology
3. Results and Discussion
3.1. Environmental Performance of ReNOx under Different Conditions
3.2. Comparison with Traditional Methods
Institutional Review Board Statement
Informed Consent Statement
Conflicts of Interest
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|A conversion reaction temperature of 200 °C, a conversion rate of 95%, and a recovery rate of 80%. The electricity mix in Japan representing the average level was used as the energy source.|
|The conversion reaction temperature was 160 °C. Correspondingly, the conversion rate was decreased to 80%. An attempt was made to examine the effect of temperature and conversion rate.|
|For the conversion stage, the feedstock was changed from methane to hydrogen and carbon monoxide to examine the effect of the feedstock format.|
|The unrecovered ammonia was released into the environment without treatment to investigate the importance of final reactive nitrogen disposal.|
|Adsorption material performances were halved to investigate the effect of capacity and reuse times.|
|The recovery rate was halved to investigate how this technical indicator affects the total environmental impact.|
|It was developed as an optimized scenario. The conversion rate was 98%. The solar electricity as a typical renewable energy source was used instead of the electricity mix.|
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Xue, M.; Lin, B.-L.; Tsunemi, K.; Minami, K.; Nanba, T.; Kawamoto, T. Life Cycle Assessment of Nitrogen Circular Economy-Based NOx Treatment Technology. Sustainability 2021, 13, 7826. https://doi.org/10.3390/su13147826
Xue M, Lin B-L, Tsunemi K, Minami K, Nanba T, Kawamoto T. Life Cycle Assessment of Nitrogen Circular Economy-Based NOx Treatment Technology. Sustainability. 2021; 13(14):7826. https://doi.org/10.3390/su13147826Chicago/Turabian Style
Xue, Mianqiang, Bin-Le Lin, Kiyotaka Tsunemi, Kimitaka Minami, Tetsuya Nanba, and Tohru Kawamoto. 2021. "Life Cycle Assessment of Nitrogen Circular Economy-Based NOx Treatment Technology" Sustainability 13, no. 14: 7826. https://doi.org/10.3390/su13147826